Solar cell welding strip

Abstract

The utility model discloses a solar cell welding strip, which comprises a welding strip main body, an upper insulating film and a lower insulating film, a plurality of pairs of welding lugs extending and protruding outwards are symmetrically arranged on the edges of the two sides of the welding strip body, and one or more notches are formed in the middle of the welding strip body. The upper-layer insulating film is fixedly adhered to the upper surface of the welding strip main body, and the lower-layer insulating film is fixedly adhered to the surface of the welding strip main body; the upper insulating film and the lower insulating film cover all the gaps; and the welding lugs are exposed out of the upper-layer insulating film and the lower-layer insulating film. The welding lugs can be directly welded and connected with the battery piece, and insulated isolation is realized through the notches; after the welding strip is welded and connected with the battery pieces, gaps between the battery pieces can be shielded and beautified through the upper-layer insulating film and the lower-layer insulating film, the appearance is attractive, the number of types of raw materials is small, adhesive films do not need to be manually pasted one by one, the adhesive film pasting position accuracy is high, the welding quality is ensured, operation is convenient, and the use requirement of a continuous production line for batch production can be met; the production efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of solar cell equipment manufacturing in the photovoltaic new energy industry, and specifically relates to a solar cell welding strip for sunpower cells that can realize an efficient welding process method for solar cells. Background Art

[0002] The specifications of the sunpower cells (i.e. solar cells) in the photovoltaic new energy industry include 125×125mm, 125×62.5mm, 125×41.6mm, 166×166mm, 166×83mm and 166×41.5mm. The sunpower cell production process in the prior art has the following defects in the production process:

[0003] 1. Sunpower cells of different specifications and models have different widths and sizes, and the corresponding required solder strip lengths are also different. When stocking raw materials, it is necessary to prepare materials to match solder strips of different lengths. There are many types of raw materials, and the workload of procurement, warehousing, material management and handling and preparation is large;

[0004] 2. The sunpower cell in the prior art usually consists of a three-layer structure, the first layer is the cell, the second layer is the adhesive film, and the third layer is the welding strip. During production and processing, the cell needs to be manually positioned and fixed, and then the adhesive film is manually pasted piece by piece. After multiple cells are formed into a single string, they are transferred to the next process for welding. Manually pasting the adhesive film is inconvenient, the pasting position accuracy is not good, and impurities are easily left on the film surface, causing quality risks. The welding residence time and welding strength cannot be controlled;

[0005] 3. The existing sunpower cell production process can only be welded by scattered manual methods; after the cell is positioned and fixed by a jig, the adhesive film is first pasted, and then the welding tape is placed on the adhesive film, and finally welding is performed. The welding efficiency and welding quality are low, and it cannot meet the needs of continuous production lines for mass production;

[0006] 4. During the production process, according to the different specifications and models of sunpower battery cells, it is necessary to screen and match the corresponding length of welding ribbons for welding. The operation is cumbersome, time-consuming, and has a large amount of ineffective work and low production efficiency. Utility Model Content

[0007] In order to solve the above-mentioned problems existing in the prior art, the purpose of the utility model is to provide a solar cell welding strip, which has a small number of raw material types, does not need to manually stick the film piece by piece, has a high accuracy in the film sticking position, ensures the welding quality, is easy to operate, can adapt to the use requirements of continuous production lines for mass production, and has high production efficiency.

[0008] The technical solution adopted by the utility model is:

[0009] A solar cell welding ribbon, comprising a welding ribbon body, an upper insulating film and a lower insulating film;

[0010] The two side edges of the welding strip body are symmetrically provided with a plurality of pairs of welding ears extending outward and protruding, and the middle part of the welding strip body is provided with one or more notches;

[0011] The upper insulating film is fixedly bonded to the upper surface of the soldering strip body, and the lower insulating film is fixedly bonded to the surface of the soldering strip body; the upper insulating film and the lower insulating film both cover all the gaps;

[0012] All welding ears are exposed outside the upper insulating film and the lower insulating film;

[0013] The welding strip body, the upper insulating film and the lower insulating film are an integral structure formed by a process of stamping, tearing and blanking after adhesive films are applied to the entire copper-based plate on both sides.

[0014] Furthermore, each of the welding ears is respectively provided with a welding pad.

[0015] Furthermore, the main material of the welding strip is rolled copper foil.

[0016] Furthermore, a pair of auxiliary welding ears are respectively arranged at positions on both side edges of the welding strip body close to both ends of the notch.

[0017] Furthermore, the ends of the welding strip body on both sides of the gap are Y-shaped forked ends, the length of the first fork side of the forked end is greater than the length of the second fork side, and the length of the first fork side of the forked end on both sides of the gap is staggered and corresponding to the second fork side, thereby forming a Z-shaped staggered gap.

[0018] Furthermore, a plurality of force-releasing holes are provided on the welding strip body.

[0019] Furthermore, the welding strip body is provided with welding bosses protruding outwards at positions corresponding to each pair of welding ears, and each welding boss is provided with one or more force-releasing holes;

[0020] Each pair of welding ears is respectively arranged on the outer end edge of the welding boss.

[0021] Furthermore, one or more bridging stress bosses are provided in the middle of the welding strip body, and a pair of welding ears are also provided at the middle edge of each bridging stress boss;

[0022] Each bridging stress boss is also provided with one or more stress relief holes.

[0023] Furthermore, a gap is respectively arranged between each of the stress-bridging bosses and each of the welding bosses.

[0024] Finally, a stress relief hole is also provided at the position of the welding strip body between the welding boss and the notch.

[0025] The beneficial effects of the utility model are:

[0026] A solar cell welding strip comprises a welding strip body, an upper insulating film and a lower insulating film; a plurality of pairs of welding ears extending outward are symmetrically arranged on the two side edges of the welding strip body, and one or more notches are arranged in the middle of the welding strip body; the upper insulating film is fixedly bonded to the upper surface of the welding strip body, and the lower insulating film is fixedly bonded to the surface of the welding strip body; the upper insulating film and the lower insulating film both cover all the notches; the welding ears are exposed outside the upper insulating film and the lower insulating film. The welding ears can be directly welded to the cell, and the notches are used to achieve insulation isolation; after the welding strip is welded to the cell, the gaps between the cell can be shielded and beautified by the upper insulating film and the lower insulating film, the appearance is beautiful, the types of raw materials are few, there is no need to manually paste the adhesive film piece by piece, the adhesive film pasting position is highly accurate, the welding quality is ensured, the operation is convenient, and it can meet the needs of continuous production lines for mass production, and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the solar cell welding strip structure of the first embodiment of the utility model;

[0028] Figure 2 yes Figure 1 A rear view structural diagram of ;

[0029] Figure 3 yes Figure 1 An enlarged schematic diagram of the left-view structure;

[0030] Figure 4 Figure 2 A magnified schematic diagram of the local structure

[0031] Figure 5 This is a schematic diagram of the main structure of the solar cell welding ribbon of the first embodiment of the utility model;

[0032] Figure 6 This is a schematic diagram of the solar cell welding strip structure of the second embodiment of the utility model;

[0033] Figure 7 yes Figure 6 A rear view structural diagram of ;

[0034] Figure 8 yes Figure 6 An enlarged schematic diagram of the left-view structure;

[0035] Fig. 9 This is a schematic diagram of the solar cell welding strip structure of the third embodiment of the utility model;

[0036] Fig.10 yes Fig. 9 A rear view structural diagram of ;

[0037] Fig.11 yes Fig. 9 An enlarged schematic diagram of the left-view structure;

[0038] Fig.12 This is a schematic diagram of the solar cell welding strip structure of the fourth embodiment of the utility model;

[0039] Fig.13 yes Fig.12 A rear view structural diagram of ;

[0040] Fig.14 yes Fig.12 An enlarged schematic diagram of the left-view structure;

[0041] Fig.15 This is a schematic diagram of the solar cell welding strip structure of the fifth embodiment of the utility model;

[0042] Fig.16 yes Fig.15 A rear view structural diagram of ;

[0043] Fig.17 yes Fig.15 An enlarged schematic diagram of the left-view structure;

[0044] Fig.18 This is a schematic diagram of the solar cell welding strip structure of the sixth embodiment of the utility model;

[0045] Fig.19 yes Fig.18 A rear view structural diagram of ;

[0046] Fig. 20 yes Fig.18 An enlarged schematic diagram of the left-view structure;

[0047] Fig.21 It is a schematic diagram of the structure of connecting a plurality of whole sunpower cells by means of a soldering band for a whole sunpower cell in a soldering band of a solar cell in the third embodiment of the present utility model;

[0048] Fig. 22 It is a schematic diagram of a layout scheme of the original strips of the solar cell solder strips on a copper-based plate in the third embodiment of the present utility model. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] like Figures 1 to 22 As shown, in order to solve the technical problems in the prior art, the utility model provides a solar cell welding strip. The overall planning scheme first conceives to provide a new type of welding strip structure and an efficient, time-saving and labor-saving solar cell welding process method to solve the technical problems existing in the prior art.

[0051] First, we study the technical problems in the prior art. First, the specifications of the sunpower battery cells in the lithium-ion battery pole pieces are various, mainly the following specifications:

[0052] Specifications include 125×125mm, 125×62.5mm, 125×41.6mm, 166×166mm, 166×83mm and 166×41.5mm.

[0053] 1. Sunpower cells of different specifications and models have different widths and sizes, and the corresponding required solder strip lengths are also different. When stocking raw materials, it is necessary to prepare materials to match solder strips of different lengths. There are many types of raw materials, and the workload of procurement, warehousing, material management and handling and preparation is large;

[0054] 2. The sunpower cell in the prior art usually consists of a three-layer structure, the first layer is the cell, the second layer is the adhesive film, and the third layer is the welding strip. During production and processing, the cell needs to be manually positioned and fixed, and then the adhesive film is manually pasted piece by piece. After multiple cells are formed into a single string, they are transferred to the next process for welding. Manually pasting the adhesive film is inconvenient, the pasting position accuracy is not good, and impurities are easily left on the film surface, causing quality risks. The welding residence time and welding strength cannot be controlled;

[0055] 3. The existing sunpower cell production process can only be welded by scattered manual methods; after the cell is positioned and fixed by a jig, the adhesive film is first pasted, and then the welding tape is placed on the adhesive film, and finally welding is performed. The welding efficiency and welding quality are low, and it cannot meet the needs of continuous production lines for mass production;

[0056] 4. During the production process, according to the different specifications and models of sunpower battery cells, it is necessary to screen and match the corresponding length of welding ribbons for welding. The operation is cumbersome, time-consuming, and has a large amount of ineffective work and low production efficiency.

[0057] The overall planning scheme is as follows:

[0058] The first technical solution provides a solar cell welding ribbon, the main structure of which is a welding ribbon body 1, an upper insulating film 2 and a lower insulating film 3;

[0059] A plurality of pairs of welding ears 11 extending outward are symmetrically arranged on both side edges of the welding strip body 1, and one or more notches 12 are arranged in the middle of the welding strip body;

[0060] The upper insulating film 2 is fixedly bonded to the upper surface of the welding strip body 1, and the lower insulating film 3 is fixedly bonded to the surface of the welding strip body 1; and the upper insulating film 2 and the lower insulating film 3 both cover all the gaps 12, that is, the welding strip body is divided into two sections by the gap 12, and the upper insulating film 2 and the lower insulating film 3 are continuous at the gap 12. The upper insulating film 2 and the lower insulating film 3 are respectively continuous long strip structures, so that the welding strips can be welded and connected to the battery cells respectively, and are separated and insulated from each other. At the same time, the welding strips can be packaged, transported, stored, transferred, loaded and unloaded, and welded and connected as a whole.

[0061] All welding ears 11 are exposed and extend outwardly from the upper insulating film 2 and the lower insulating film 3 so as to realize welding connection and ensure stable and reliable performance of electrical connection.

[0062] The welding strip body 1, the upper insulating film 2 and the lower insulating film 3 are made of a copper-based plate with a double-sided adhesive film, and then the adhesive film at the welding ear is punched and peeled off by a stamping process, that is, the film is torn off, and then the material is cut by a stamping process, so that the welding strip body 1, the upper insulating film 2 and the lower insulating film 3 are an integral structure formed by the copper-based plate with a double-sided adhesive film and the stamping and tearing film cutting process.

[0063] The welding ears can be directly welded to the battery cells, and insulation isolation is achieved through the gaps. After the battery cells are welded and connected with the welding ribbons, the gaps between the battery cells can be covered and beautified by the upper insulating film and the lower insulating film. The appearance is beautiful, the types of raw materials are few, and there is no need to manually stick the film piece by piece. The adhesive film sticking position is highly accurate, ensuring the welding quality. The operation is convenient and can meet the needs of continuous production lines for mass production, with high production efficiency.

[0064] Preferably, a soldering pad 13 is provided on each soldering ear 11 , through which soldering connection with the battery cell can be achieved. The soldering pad 13 can be formed by brushing solder paste through a steel screen printing process.

[0065] Preferably, the material of the welding strip body 1 is directly rolled copper foil to ensure sufficient mechanical properties and conductive properties, and to be stable and reliable.

[0066] The material of the upper insulating film 2 and the lower insulating film 3 is PI film, that is, polyimide film. The PI film has excellent heat resistance, good mechanical properties, outstanding chemical stability and excellent dielectric properties.

[0067] Preferably, a pair of auxiliary welding ears 14 are respectively provided at the two side edges of the welding strip body 1 close to the two ends of the notch 12 .

[0068] Preferably, the ends of the welding strip body 1 on both sides of the notch 12 are Y-shaped forked ends, the length of the first fork side 15 of the forked end is greater than the length of the second fork side 16, and the lengths of the first fork sides of the forked ends on both sides of the notch 12 are staggered and correspond to the second fork sides, thereby forming a notch with a Z-shaped staggered structure.

[0069] Preferably, a plurality of stress relief holes 17 are also provided on the welding strip body 1; after the welding strip is welded and connected to the battery cell assembly and put into use, during continuous use in a natural environment, the internal material will undergo creep deformation due to temperature changes, and the stress relief holes 17 can relieve the stress at the welding connection position when the material undergoes creep deformation, thereby preventing the welding connection position from being pulled, deformed or even broken.

[0070] Preferably, a welding boss 18 protruding outward is respectively arranged at the position of the welding strip body 1 corresponding to each pair of welding ears 11, and one or more stress relief holes 17 are arranged on each welding boss 18; each pair of welding ears 11 is respectively arranged at the outer end edge of the welding boss 18. The welding boss 18 can further improve the welding connection effect and further prevent stress deformation and fracture.

[0071] Preferably, one or more bridging stress bosses 19 are further provided in the middle of the welding strip body 1, and a pair of welding ears 11 are also provided at the middle edge of each bridging stress boss 19; one or more stress relief holes 17 are also provided on each bridging stress boss 19; the welding strip of the utility model can realize multi-point welding connection with the entire battery cell through the welding ears 11 on the middle bridging stress boss 19.

[0072] Preferably, a gap is provided between each stress-bridging boss and each welding boss, respectively, to meet the use requirements of welding connection conduction between different battery cell circuit structures.

[0073] Finally, a force relief hole 17 is also provided at a position of the welding strip body 1 between the welding boss and the notch, so as to further improve the safety, stability and reliability performance.

[0074] The solar cell welding strip of the utility model comprises a welding strip body, an upper insulating film and a lower insulating film; a plurality of pairs of welding ears extending outward are symmetrically arranged on the two side edges of the welding strip body, and one or more notches are arranged in the middle of the welding strip body; the upper insulating film is fixedly bonded to the upper surface of the welding strip body, and the lower insulating film is fixedly bonded to the surface of the welding strip body; the upper insulating film and the lower insulating film both cover all the notches; the welding ears are exposed outside the upper insulating film and the lower insulating film. The welding ears can be directly welded to the cell, and the notches are used to achieve insulation isolation; after the welding strip is welded to the cell, the gaps between the cell can be shielded and beautified by the upper insulating film and the lower insulating film, the appearance is beautiful, the types of raw materials are few, there is no need to manually paste the adhesive film piece by piece, the adhesive film pasting position is highly accurate, the welding quality is ensured, the operation is convenient, and it can meet the needs of continuous production lines for mass production, and the production efficiency is high.

[0075] The second technical solution provides an efficient welding process method for solar cells, including the following steps:

[0076] Select metal sheet or metal foil as raw material;

[0077] Apply the adhesive film to both sides of the metal sheet or metal foil;

[0078] Punch and remove the adhesive film at the welding ear position;

[0079] Apply solder paste to the soldering ears;

[0080] Punching and shearing to obtain finished welding strips;

[0081] All the cells located in two adjacent whole cell regions 200 are connected by welding at the same time through one welding ribbon.

[0082] The third technical solution provides another efficient welding process method for solar cells, including the following steps:

[0083] Select copper-based plate or copper foil as raw material;

[0084] One-time striping and punching of positioning holes;

[0085] Apply adhesive film on both sides of the copper-based plate or copper foil;

[0086] bake;

[0087] Punch and remove the adhesive film at the welding ear position;

[0088] Cleaning;

[0089] Apply solder paste to the soldering ears;

[0090] Punching and shearing, secondary stripping to obtain finished welding strip;

[0091] All the cells located in two adjacent whole cell regions 200 are connected by welding at the same time through one welding ribbon.

[0092] The fourth technical solution also provides another efficient welding process method for solar cells, which is specifically performed according to the following steps:

[0093] S01, prepare copper-based plate; the Vickers hardness of the copper-based plate is required to be less than 55kg / mm 2 ; The thickness range of copper-based sheet is 0.1mm~0.2mm.

[0094] Preferably, the thickness of the copper-based plate is 0.15 mm.

[0095] Specifically, a copper foil with a thickness of 0.15 mm can be used;

[0096] Since the copper foil raw material has a large area, it needs to be cut into three parts according to the jig specifications of the production equipment, that is, the entire work board is divided into 3PNL;

[0097] S02, according to the production order design plan, layout the layout plan of the welding strip 10 on the copper base plate 100;

[0098] S03, machining a jig positioning hole on the copper-based plate 100, through which the copper-based plate can be positioned on the jig;

[0099] S04, first striping: according to the layout plan of the original strip of the layout welding ribbon, punching and cutting the notch 12 of each welding ribbon;

[0100] After the adhesive film is subsequently applied, the gap is covered and bridged by double-sided adhesive film, that is, the adhesive films on both sides of each gap are continuous.

[0101] The specific notch structure of the welding strip is as follows Figure 5 shown.

[0102] The length, width, welding ear position, welding ear pair number, and notch position and number of the welding ribbon body can be adaptively set according to the specifications of the battery cell; for example, according to the different specifications of the sunpower battery cell such as 125×125mm, 125×62.5mm, 125×41.6mm, 166×166mm, 166×83mm and 166×41.5mm, the length, width, welding ear position, welding ear pair number, and notch position and number of the welding ribbon body can be set accordingly;

[0103] For example, the sunpower battery cells of 125×125mm and 166×166mm specifications are whole sunpower battery cells, and a whole soldering ribbon structure for the whole sunpower battery cell can be set accordingly; the sunpower battery cells of 125×62.5mm and 166×83mm specifications are 1 / 2 sunpower battery cells, and a 1 / 2 soldering ribbon structure for the 1 / 2 sunpower battery cell can be set accordingly; the sunpower battery cell of 125×41.6mm specifications is 1 / 3 sunpower battery cell, and a 1 / 3 soldering ribbon structure for the 1 / 3 sunpower battery cell can be set accordingly; the sunpower battery cell of 166×41.5mm specifications is 1 / 4 sunpower battery cell, and a 1 / 4 soldering ribbon structure for the 1 / 4 sunpower battery cell can be set accordingly.

[0104] S05, fully covering the front and back sides of the copper-based plate with adhesive film;

[0105] The material of the adhesive film is preferably polyimide material;

[0106] The thickness of the film is 0.06mm~0.15mm;

[0107] Preferably, the thickness of the adhesive film is 0.06 mm or 0.135 mm.

[0108] Before applying the adhesive film, the shape of the part where the copper substrate needs to be exposed during the use of the solder strip is pre-carved on the adhesive film;

[0109] Specifically, the positions of the welding ears that need to be exposed on the copper-based plate are pre-engraved and marked on the adhesive film by a laser engraving machine to form a knock-out hole structure;

[0110] S06, baking the copper-based plate as a whole at high temperature for a period of time;

[0111] The baking temperature range is 230℃~280℃;

[0112] The specific baking time is 2 to 5 minutes, and in special cases it can be baked for one hour.

[0113] Preferably, the baking temperature is set to 250° C.; and the baking time is set to 3 minutes.

[0114] S07, removing the adhesive film at each welding ear position of each welding ribbon original strip by die stamping, exposing the copper base plate at all welding ear positions; the specific stamping die can adopt conventional film tearing equipment in the prior art;

[0115] S08, cleaning the welding ear position; specifically, the welding ear position can be cleaned by using a conventional degreasing micro-etching cleaning production line in the prior art;

[0116] S09, putting the cleaned copper-based plate into a steel mesh container, brushing solder paste on all welding ear positions, and obtaining a semi-finished solder strip plate; specifically, a steel mesh container printing device in a conventional steel mesh printing process in the prior art can be used to brush solder paste on all welding ear positions;

[0117] The thickness of the solder paste applied on the soldering ear position is 50-70 μm; preferably, the thickness of the solder paste applied on the soldering ear position is 60 μm.

[0118] S10, placing the semi-finished plate of the welding strip into a stamping jig for stamping to achieve the second stripping; at the same time, the copper base plate and the adhesive film at each unloading hole 17 are removed by punching and shearing, and the stamping is performed and blanking is performed;

[0119] Simultaneous stamping and blanking;

[0120] A finished solder strip overall structure having an upper insulating film 2 and a lower insulating film 3 is obtained;

[0121] Then go to step S11 or step S12.

[0122] S11, packaging and storage according to packaging requirements;

[0123] Specific packaging and storage requirements are as follows: Store in a ventilated, cool and dry environment, temperature: <25℃, humidity: <70%, away from light;

[0124] Storage environment: Temperature: 18-24℃ Humidity 40-70%;

[0125] FPC shelf life: 12 months for chemical gold process, 6 months for anti-oxidation process, vacuum packaging;

[0126] S12, transferring to the loading area of ​​the battery cell welding platform; specifically, the loading area of ​​the welding platform of a conventional conductor automatic welding production line equipment with grabbing, conveyor belt, negative pressure, welding head and other equipment in the prior art can be directly transferred;

[0127] S13, using a grabbing and suction tool to suck the battery cell and the welding ribbon onto the welding platform respectively;

[0128] S14, positioning and fixing the welding strip;

[0129] S15, sucking and placing the battery cell on the welding ribbon;

[0130] S16, using a negative pressure device to simultaneously adsorb and fix the solder ribbon and the battery cell on the conveyor belt;

[0131] S17, the conveyor belt runs in a circular motion, continuously conveying the solder ribbon and the battery cell forward simultaneously;

[0132] S18, the welding station uses a welding head to fix each welding point of the welding strip to the battery cell at the corresponding position, so as to realize the simultaneous welding connection of all the battery cells located in two adjacent whole battery cell areas 200 through one welding strip.

[0133] The welding connection method and welding connection structure are used to simultaneously weld and connect all the battery cells located in two adjacent whole battery cell areas 200 through welding strips 10 with corresponding different structures according to battery cells of different specifications and sizes.

[0134] The actual operation process is as follows:

[0135] 1: Use a 0.15mm copper substrate panel with a hardness (HV) less than 55, first drill the fixture positioning holes on the copper foil, and then perform a striping operation;

[0136] 2: After the copper foil is stripped once, a 0.06mm thick polyimide material is used to laminate the front and back sides of the copper foil;

[0137] 3: Put the copper foil with film into the baking oven and bake it at 250 degrees for 3 minutes to make the film material and copper foil completely combined;

[0138] 4: Put the baked material into a customized mold, remove the surface film material of the welding ear of the welding strip by stamping, leave the welding ear position, and then put the welding ear position into a specific box for cleaning to keep the welding ear clean and prepare for the tinning process.

[0139] 5: Put the cleaned raw materials into a specific steel mesh container and apply solder paste at the welding ear position with a thickness of 60um;

[0140] 6: Then put the finished product into the stamping jig with the mold opened for stamping and striping, and stamp out strips of welding strips that meet the requirements of the drawing;

[0141] 7: Then pack the solder strip according to the packaging requirements;

[0142] 8: When producing and welding sunpower cells, you only need to place the processed solder strips on the loading area, and the equipment will absorb the solder strips and cells onto the welding platform according to the program;

[0143] 9: The first step is to suck the soldering tape onto the platform and fix the position, then suck the battery cell and place it on the position of the soldering tape. At the same time, the negative pressure equipment adsorbs and fixes the soldering tape and the battery cell, and transmits them forward with a conveyor belt. The equipment's specific welding head directly welds the soldering tape and the battery cell together, completing the entire welding process.

[0144] The traditional way of separating the welding strip and the film is replaced by an integrated process to form an integral component. Especially for the welding of products with sizes of 125*62.5mm, 125*41.6mm, 166*83mm and 166*41.5mm, it completely subverts the traditional welding method and directly adopts the double-sided lamination process to achieve the protection of the insulating layer between welding and the embodiment of the overall process of the welding strip. The same process can be used for production on the same set of equipment, and switching between products of different specifications is very convenient.

[0145] The disadvantages of conventional production of sunpower solder strips, which require manual film lamination and cannot be mass-produced by equipment, are unified into one process, and can be completed by direct welding by equipment. The process adopted is to combine the film material and the solder strip together directly to form an integral accessory instead of the traditional separate film lamination method, which can be directly produced by equipment, simplifying the difficulty of manual operation hours and low production efficiency in the production process. The equipment is used to directly cover the film and the solder strip together, and the high-temperature lamination process technology used by the equipment is more stable, ensuring that there are no bubbles between the film and the solder strip and the adhesion is stronger, reducing the quality risks caused by impurities remaining on the surface of the film due to manual film lamination.

[0146] 1: The solar cell welding strip of the utility model greatly improves the production efficiency. Compared with the unit hourly production capacity of conventional manual welding, the welding strip produced by this process combined with the welding equipment can increase the unit hourly labor efficiency by 40%;

[0147] 2: The soldering tape produced by the solar cell soldering tape of the utility model can be accurately soldered on the equipment, and the soldering temperature and soldering time of the equipment can be accurately controlled. Compared with the previous manual soldering method, the soldering temperature and soldering dwell time cannot be accurately controlled. The quality stability and controllability of the product using this process are also greatly improved;

[0148] 3: The copper strip substrate with more suitable hardness is used to reduce the problem of hidden cracks in the welded battery cells caused by the stress of the welding strip;

[0149] 4: The process of tinning the welding ears is adopted to increase the thickness of the welding ear tin layer, increase the solderability, and reduce the surface tin cost problem caused by the full tin coating of conventional welding strips;

[0150] 5: The utility model reduces the step of soaking the soldering ribbon in the soldering flux during soldering of the solar cell soldering ribbon, thereby reducing the quality risk of the soldering flux remaining on the surface of the solar cell.

[0151] The solar cell welding strip of the utility model adopts the whole copper-based plate or copper foil as the raw material, firstly, the adhesive film is fully pasted on the front and back sides of the copper-based plate or copper foil, and then the adhesive film at the welding ear position is removed by punching, cleaned, and solder paste is brushed on the welding ear position; finally, the finished welding strip is obtained by punching and shearing, and stripping. The welding strip only needs to prepare the raw material of the whole copper-based plate, and welding strips of different models and specifications can be arranged on the whole copper-based plate. The raw material types are few, which reduces the workload of procurement, warehousing, material management and handling and preparation. There is no need to manually paste the adhesive film piece by piece, and the adhesive film pasting position is highly accurate, ensuring the welding quality, easy to operate, and can meet the needs of continuous production line use in batch production, with high production efficiency. It is suitable for the welding of sunpower battery cells of 125*125mm 125*62.5mm 125*41.6mm, 166*166mm 166*83mm, and 166*41.5mm, filling the technical gap that cannot be centralized in this field.

[0152] Embodiment 1: Embodiment 1 provides a solder strip for a 1 / 2 piece sunpower cell sheet with a specification of 125×62.5 mm;

[0153] The specific structure of the welding strip for 1 / 2-piece sunpower battery cells with a specification of 125×62.5mm is as follows: two welding bosses 18 are arranged near the two ends of the welding strip body 1, and a pair of welding ears 11 extending outward are arranged on the edges of both sides of the outer end of each welding boss, and the outer edges of the welding ears 11 are aligned with the outer edges of the welding bosses.

[0154] A notch 12 is provided in the middle of the welding strip body 1 of the welding strip; three unloading holes 17 are provided on each welding boss, and a unloading hole 17 is provided in the middle position of the welding strip body 1 between the notch 12 and each welding boss 18.

[0155] The upper insulating film 2 is fixedly bonded to the upper surface of the soldering strip body 1, and the lower insulating film 3 is fixedly bonded to the surface of the soldering strip body 1; and both the upper insulating film 2 and the lower insulating film 3 cover all the notches 12, that is, the soldering strip body is divided into two sections by the notch 12, and the upper insulating film 2 and the lower insulating film 3 are continuous at the notch 12, and the upper insulating film 2 and the lower insulating film 3 are respectively continuous long strip structures.

[0156] A soldering pad 13 is provided on each soldering ear 11 , through which soldering connection with the battery cell can be achieved. The soldering pad 13 is formed by applying solder paste through a steel screen printing process.

[0157] A pair of auxiliary welding points 14 are respectively arranged at the two ends of the notch 12 , and the auxiliary welding points 14 can assist in welding connection to the battery cell, thereby improving the reliability of welding connection.

[0158] The ends of the welding strip body 1 on both sides of the notch 12 are both Y-shaped forked ends, the length of the first fork side 15 of the forked end is greater than the length of the second fork side 16, and the lengths of the first fork sides of the forked ends on both sides of the notch 12 are staggered and corresponding to each other, thereby forming a notch with a Z-shaped staggered structure.

[0159] The pads on each pair of welding ears are respectively welded to the upper and lower adjacent 1 / 2 battery cells; the welding strip for the 125×62.5mm 1 / 2 sunpower battery cell provided in Example 1 can be welded to connect the four upper, lower, left and right adjacent 1 / 2 battery cells in a row of whole battery cells located in the area of ​​two upper and lower adjacent whole battery cells, thereby forming two upper and lower adjacent whole battery cells of 125×125mm.

[0160] Embodiment 2: Embodiment 2 provides a second welding strip for a 1 / 3 piece sunpower battery cell with a specification of 125×41.6 mm.

[0161] The specific structure of the second welding strip for 1 / 3 sunpower battery cells with a specification of 125×41.6mm is as follows: based on the aforementioned planning scheme and embodiment 1, two welding bosses 18 are arranged near the two ends on the second welding strip body 102, and a pair of welding ears 11 extending outward are arranged on both side edges of the outer end of each welding boss, and the outer end edges of the welding ears 11 are aligned with the outer end edges of the welding bosses.

[0162] A bridging boss 19 is arranged in the middle of the second welding belt body 102 of the second welding belt, and a pair of welding ears 11 extending outward are arranged in the middle of the bridging boss 19; one bridging boss is a combination of two welding bosses.

[0163] Three stress relief holes 17 are arranged on one welding boss, and six stress relief holes 17 are arranged on one bridging boss.

[0164] A second upper insulating film 1022 and a second lower insulating film 1023 are fixedly attached to the upper and lower surfaces of the second solder tape body 102 , respectively.

[0165] A notch 12 is respectively provided at the middle position between the bridging boss and each welding boss; isolation and insulation can be achieved through the notch 12.

[0166] The pads on each pair of welding ears are respectively welded to two adjacent 1 / 3 battery cells above and below; the three welding ears on one side edge of each welding strip can be welded to three 1 / 3 battery cells that are combined side by side to form a whole battery cell.

[0167] The second welding strip for the 1 / 3-cell sunpower battery cell of 125×41.6mm provided in Example 2 can be used to weld and connect six 1 / 3-cell batteries located in the upper and lower left and right areas of two upper and lower adjacent whole-cell batteries in a row of whole-cell batteries, thereby forming two upper and lower adjacent whole-cell batteries of 125×125mm.

[0168] Embodiment 3: Embodiment 3 provides a third welding strip for a whole sunpower battery cell with a specification of 125×125 mm.

[0169] The specific structure of the third welding strip for the whole sunpower battery cell with a specification of 125×125mm is as follows: on the basis of the aforementioned planning scheme, two welding bosses 18 are arranged near the two ends of the third welding strip body 103, and a pair of welding ears 11 extending outward are arranged on the edges of both sides of the outer end of each welding boss, and the outer edge of the welding ear 11 is aligned with the outer edge of the welding boss.

[0170] A bridging boss 19 is provided in the middle of the first welding belt body 101 of the third welding belt, and a pair of welding ears 11 extending outward are provided in the middle of the bridging boss 19; one bridging boss is a combination of two welding bosses.

[0171] Three unloading holes 17 are provided on one welding boss, and six unloading holes 17 are provided on one bridging boss; the pads on each pair of welding ears are respectively welded to two upper and lower adjacent whole cell sheets of 125×125 mm; the third upper insulating film 1032 and the third lower insulating film 1033 are respectively fixedly attached to the upper and lower surfaces of the third welding ribbon body 103. Two upper and lower adjacent whole cell sheets of 125×125 mm in a row of whole cell sheets can be welded and connected by one third welding ribbon.

[0172] Embodiment 4: Embodiment 4 provides a fourth welding strip for a 1 / 2 piece sunpower battery sheet with a specification of 166×83mm;

[0173] The specific structure of the fourth welding strip for 1 / 2-piece sunpower battery cells with a specification of 166×83mm is as follows: Based on the aforementioned planning scheme and embodiments one to three, two welding bosses 18 are arranged near both ends of the fourth welding strip body 104, and a pair of welding ears 11 extending outward are arranged on both side edges of the outer end of each welding boss, and the outer end edges of the welding ears 11 are aligned with the outer end edges of the welding bosses.

[0174] Two bridging bosses 19 are evenly distributed in the middle section of the fourth welding strip body 102 of the fourth welding strip, the intervals between the two bridging bosses 19 and the two welding bosses 18 are evenly distributed, and a pair of outwardly extending welding ears 11 are respectively provided in the middle of each bridging boss 19; a bridging boss is a combination of two welding bosses.

[0175] Three stress relief holes 17 are arranged on one welding boss, and six stress relief holes 17 are arranged on one bridging boss.

[0176] A fourth upper insulating film 1042 and a fourth lower insulating film 1043 are fixedly attached to the upper and lower surfaces of the fourth solder tape body 104 , respectively.

[0177] A notch 12 is provided between the two bridging bosses.

[0178] The pads on each pair of welding ears are respectively welded to two 166×83mm 1 / 2 battery cells adjacent to each other; the four welding ears on one side edge of each welding strip can be respectively welded to two 166×83mm 1 / 2 battery cells that are combined side by side to form a whole battery cell.

[0179] The welding strip for 166×83mm 1 / 2-cell sunpower battery cells provided in Example 1 can be used to weld and connect four 166×83mm 1 / 2-cell battery cells located in the upper and lower left and right adjacent areas of two upper and lower adjacent whole-cell battery cells in a row of whole-cell batteries, thereby forming two upper and lower adjacent whole-cell 166×166mm battery cells.

[0180] Embodiment 5: Embodiment 5 provides a fifth welding strip for a 1 / 4 piece sunpower cell sheet with a specification of 166×41.5 mm;

[0181] The specific structure of the fifth welding strip for 1 / 4 sunpower battery cell with a specification of 166×41.5mm is as follows: on the basis of the aforementioned planning scheme and embodiments 1 to 4, two welding bosses 18 are arranged near the two ends of the fifth welding strip body 105, and a pair of welding ears 11 extending outward are arranged on both side edges of the outer end of each welding boss, and the outer end edges of the welding ears 11 are aligned with the outer end edges of the welding boss.

[0182] Two bridging bosses 19 are arranged in the middle section of the fifth welding strip body 105 of the fifth welding strip. The intervals between the two bridging bosses 19 and the two welding bosses 18 are evenly distributed. A pair of welding ears 11 extending outward are arranged in the middle of each bridging boss 19. One bridging boss is a combination of two welding bosses.

[0183] Three stress relief holes 17 are arranged on one welding boss, and six stress relief holes 17 are arranged on one bridging boss.

[0184] A fifth upper insulating film 1052 and a fifth lower insulating film 1053 are fixedly attached to the upper and lower surfaces of the fifth solder ribbon body 105 , respectively.

[0185] A notch 12 is respectively provided at the middle position between each bridging boss and each welding boss, and a notch 12 is also provided at the middle position between two bridging bosses, and isolation and insulation can be achieved through the notch 12 .

[0186] The pads on each pair of welding ears are respectively welded to two upper and lower adjacent 1 / 4 battery cells of 166×41.5mm in size; the four welding ears on the same side edge of each welding strip can be welded to four 1 / 4 battery cells of 166×41.5mm in size that are combined side by side to form a whole battery cell.

[0187] The fifth welding strip for the 166×41.5mm 1 / 4-cell sunpower battery cell provided in Example 5 can be used to weld and connect eight 166×41.5mm 1 / 4-cell battery cells located in the upper and lower left and right adjacent areas of two upper and lower adjacent whole-cell battery cells in a row of whole-cell batteries, thereby forming two upper and lower adjacent whole-cell 166×166mm battery cells.

[0188] Embodiment 6: Embodiment 6 provides a sixth welding ribbon for a whole sunpower cell sheet of 166×166 mm specification;

[0189] The specific structure of the sixth welding strip for the whole sunpower battery cell with a specification of 166×166mm is as follows: on the basis of the aforementioned planning scheme and embodiments one to five, two welding bosses 18 are arranged near the two ends of the sixth welding strip body 106, and a pair of welding ears 11 extending outward are arranged on both side edges of the outer end of each welding boss, and the outer end edges of the welding ears 11 are aligned with the outer end edges of the welding boss.

[0190] Two bridging bosses 19 are arranged in the middle section of the sixth welding strip body 106 of the fifth welding strip. The intervals between the two bridging bosses 19 and the two welding bosses 18 are evenly distributed. A pair of welding ears 11 extending outward are arranged in the middle of each bridging boss 19. One bridging boss is a combination of two welding bosses.

[0191] Three stress relief holes 17 are arranged on one welding boss, and six stress relief holes 17 are arranged on one bridging boss.

[0192] A sixth upper insulating film 1062 and a sixth lower insulating film 1063 are fixedly attached to the upper and lower surfaces of the sixth solder tape body 106 , respectively.

[0193] The pads on each pair of welding ears are respectively welded to two upper and lower adjacent 166×166mm whole battery cells, that is, the four welding ears on the same side edge of each welding strip can be welded to the same 166×166mm whole battery cell; two upper and lower adjacent 166×166mm whole battery cells in a row of whole battery cells can be welded together through a sixth welding strip.

[0194] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.

Claims

1. A solar cell welding ribbon, characterized in that: It includes a welding strip body, an upper insulating film and a lower insulating film; The two side edges of the welding strip body are symmetrically provided with a plurality of pairs of welding ears extending outward and protruding, and the middle part of the welding strip body is provided with one or more notches; The upper insulating film is fixedly bonded to the upper surface of the soldering strip body, and the lower insulating film is fixedly bonded to the surface of the soldering strip body; the upper insulating film and the lower insulating film both cover all the gaps; All welding ears are exposed outside the upper insulating film and the lower insulating film; The welding strip body, the upper insulating film and the lower insulating film are an integral structure formed by a process of stamping, tearing and blanking after adhesive films are applied to the entire copper-based plate on both sides.

2. The solar cell welding ribbon according to claim 1, characterized in that: Each welding ear is respectively provided with a welding pad.

3. The solar cell welding ribbon according to claim 1, characterized in that: The main material of the welding strip is rolled copper foil.

4. The solar cell welding ribbon according to claim 1, characterized in that: A pair of auxiliary welding ears are respectively arranged at the positions of the two side edges of the welding strip body close to the two ends of the notch.

5. The solar cell welding ribbon according to claim 1, characterized in that: The ends of the welding strip body on both sides of the gap are Y-shaped forked ends, the length of the first fork side of the forked end is greater than the length of the second fork side, and the length of the first fork side of the forked end on both sides of the gap is staggered and corresponding to the second fork side, thereby forming a Z-shaped staggered gap.

6. The solar cell welding ribbon according to claim 1, characterized in that: The welding strip body is also provided with a plurality of force-releasing holes.

7. The solar cell welding ribbon according to claim 6, characterized in that: The welding strip body is respectively provided with welding bosses protruding outwards at positions corresponding to each pair of welding ears, and each welding boss is provided with one or more force-releasing holes; Each pair of welding ears is respectively arranged on the outer end edge of the welding boss.

8. The solar cell welding ribbon according to claim 7, characterized in that: One or more bridging stress bosses are arranged in the middle of the welding strip body, and a pair of welding ears are also arranged at the middle edge of each bridging stress boss; Each bridging stress boss is also provided with one or more stress relief holes.

9. The solar cell welding ribbon according to claim 8, characterized in that: A notch is respectively arranged between each of the stress bridging bosses and each of the welding bosses.

10. The solar cell welding ribbon according to claim 1, characterized in that: The welding strip body is also provided with a force relief hole at a position between the welding boss and the notch.

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