High-efficiency production method and application of solder paste battery assembly

Abstract

The invention relates to a high-efficiency production method and application of a solder paste battery assembly, and belongs to the technical field of photovoltaic batteries. The production method comprises the following steps: raw material preparation and processing pretreatment of the solder paste battery assembly; processing the solder paste raw material to obtain solder paste; coating and printing solder paste on the photovoltaic cell to obtain a solder paste cell; pre-welding treatment, welding treatment and post-welding treatment are conducted; and laminating and packaging to obtain the solder paste battery assembly. According to the invention, the solder paste raw material is treated and the surface is cleaned before coating and printing, so that the solder paste is not easy to fall off after welding, the cooling time after welding is short, the electric connectivity of the welding part is good, the production efficiency of the solder paste battery assembly is improved, the production cost is reduced, and large-scale application in photovoltaic production can be formed.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic cells, and in particular relates to a high-efficiency production method of a solder paste battery assembly and application thereof. Background Art

[0002] Solder paste batteries are photovoltaic cells that use solder paste as welding material to attach to semi-finished battery products. They are the main assembly components of solder paste photovoltaic cell components. During the production process of solder paste battery components, solder paste needs to be printed and electrical components fixed for welding to serve as the electrical connection structure of the battery.

[0003] Existing solder paste is mostly used for welding PCB circuit boards in the electronics industry. Its components are relatively complex and contain many precious metals such as silver. It is expensive and is not completely suitable for the production and manufacturing of photovoltaic cell modules. In addition, it has the following disadvantages during use: First, the production method of solder paste battery modules lacks to process the solder paste before applying the solder paste. Due to the viscosity of the solder paste itself, the solder paste is prone to defects such as pulling tips and bridging during the printing process; second, there is a lack of surface cleaning before the solder paste is applied and printed. After application and printing, the solder paste is easy to fall off the photovoltaic panel, thereby affecting the production quality of the solder paste battery module; third, the existing production method of solder paste battery modules requires cooling the welding parts at room temperature after welding. During the process, the welding parts are prone to react with the air, affecting the electrical connection characteristics of the solder joints. At the same time, the cooling rate is low, which reduces the production efficiency of the solder paste battery module; therefore, it is very necessary to design a high-efficiency production method and application of solder paste battery modules. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides the following technical solutions:

[0005] In one aspect, the present invention provides a method for producing a solder paste battery assembly, comprising the following steps:

[0006] Processing solder paste raw materials to obtain solder paste; the solder paste raw materials include tin powder and rosin resin acid, and the amount of rosin resin acid added is 0.8-1.2% of the mass of the solder paste raw materials;

[0007] Applying printed solder paste on photovoltaic cells to obtain solder paste cells;

[0008] Pre-welding treatment, welding treatment and post-welding treatment;

[0009] Lamination packaging to obtain solder paste battery components.

[0010] For example, the added amount of the rosin resin acid is 0.8%, 0.9%, 1%, 1.1% or 1.2% of the mass of the solder paste raw material.

[0011] Furthermore, the particle size of the tin powder is 25-45 μm; wherein, there is an adaptive relationship between the particle size of the tin powder and the welding temperature, because the particle size of the tin powder will affect the melting speed and welding quality of the tin powder during the welding process. For example, tin powder with a smaller particle size has a larger surface area and melts faster, which can improve the welding efficiency, but too small a particle size may cause oxidation problems and affect the welding quality; therefore, it is necessary to select tin powder with a suitable particle size and welding temperature.

[0012] Optionally, the particle size of the tin powder is 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm or 45 μm.

[0013] The rosin resin acid includes the following commonly used structural types: abietic acid-type resin acids (such as pimaric acid, neo-pimaric acid, levopimaric acid, palustric acid), pimaric acid-type resin acids (such as pimaric acid, isopimaric acid), and dehydroabietic acid.

[0014] Furthermore, the processing of solder paste raw materials to obtain solder paste includes: mixing and stirring tin powder and rosin resin acid to obtain solder paste, and storing it at a constant temperature for standby use; the rotation speed of the mixing and stirring is 30-60r / min, and the mixing and stirring time is 18-25min; the constant temperature storage temperature is 25-27°C.

[0015] Optionally, the rotation speed of the mixing and stirring is 30r / min, 32r / min, 35r / min, 38r / min, 40r / min, 42r / min, 45r / min, 48r / min, 50r / min, 52r / min, 55r / min, 58r / min or 60r / min.

[0016] Furthermore, before processing the solder paste raw materials to obtain the solder paste, it also includes raw material preparation and pre-processing treatment of the solder paste battery assembly.

[0017] Furthermore, the raw material preparation includes: preparing photovoltaic cells, solder paste raw materials and connectors;

[0018] Furthermore, the connecting piece is a photovoltaic welding strip; the photovoltaic welding strip is a copper strip or an aluminum strip, and has a rectangular cross-sectional shape; the photovoltaic welding strip has a width of 0.5-0.8 mm and a thickness of 0.16-0.25 mm.

[0019] Optionally, the width of the photovoltaic welding ribbon is 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm.

[0020] Optionally, the thickness of the photovoltaic welding ribbon is 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm or 0.25 mm.

[0021] Further, the pre-processing treatment includes: cleaning the connectors, etching the connectors;

[0022] The cleaning connector is to use deionized water to continuously clean for 1-2 minutes, and then dry it; the drying temperature is 45-48°C, and the drying time is 3-5 minutes;

[0023] The etching connector is performed by pickling and etching the connector and then washing it with water; the pickling and etching solution is a nitric acid solution with a mass concentration of 5%-8%; and the pickling and etching time is 5-6 minutes.

[0024] Furthermore, the step of applying and printing solder paste on the photovoltaic cell to obtain the solder paste cell comprises: applying the solder paste evenly on the printed area of ​​the photovoltaic cell to obtain the solder paste cell after applying and printing;

[0025] The printing area is the main grid position corresponding to the photovoltaic cell sheet, and the main grid width is 0.5-1.0 mm; the main grid includes a positive main grid and a negative main grid.

[0026] The coating printing process is as follows: the scraper width in the printing direction exceeds the printing area by 50-60 μm, and the scraper pressure is 7.8-8.5 KG; the printing gap of the coating printing is 0.002-0.07 mm, and the printing roller temperature of the coating printing is 45-47° C.

[0027] Optionally, the printing gap is 0.002 mm, 0.005 mm, 0.01 mm, 0.015 mm, 0.02 mm, 0.025 mm, 0.03 mm, 0.035 mm, 0.04 mm, 0.045 mm, 0.05 mm, 0.055 mm, 0.06 mm, 0.065 mm or 0.07 mm.

[0028] Furthermore, the pre-welding treatment includes: cleaning, disinfecting and preheating the welding equipment before welding;

[0029] The cleaning treatment includes cleaning the welding head with a brush; the disinfection treatment uses a 75% concentration ethanol solution; and the preheating treatment temperature is 180-260°C.

[0030] Optionally, the temperature of the preheat treatment is 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C or 260°C.

[0031] Furthermore, the welding process includes: placing a connector on a printed area coated with solder paste, and welding and fixing a plurality of solder paste battery cells to obtain a solder paste battery string group;

[0032] The welding temperature of the welding is 230-260°C and the welding time is 5-10s;

[0033] Optionally, the welding temperature of the welding fixation is 230°C, 235°C, 240°C, 245°C, 250°C, 255°C or 260°C.

[0034] The method of welding and fixing multiple solder paste battery cells is: the positive main grid of one of the adjacent solder paste battery cells and the negative main grid of the other are located in the same straight line, the connecting parts are placed along the straight line, and the positive and negative electrodes of the multiple solder paste battery cells are connected in series after welding and fixing; wherein the welding equipment can select a photovoltaic string welding machine.

[0035] Furthermore, the post-welding treatment includes: cooling the solder paste battery string group, and grinding and cleaning the welding parts after cooling; the cooling is argon gas blowing cooling;

[0036] In a specific embodiment, the cooling is to use argon gas at a temperature of 15-18° C. to continuously purge the soldering parts on the solder paste battery string group for 5-10 seconds.

[0037] Furthermore, the lamination packaging to obtain the solder paste battery assembly includes: using packaging materials to perform lamination packaging, cooling, performance testing, and packaging on the solder paste battery string group to obtain the solder paste battery assembly; the lamination packaging temperature is 130-140°C, and the processing time is 15-18min; the cooling temperature is room temperature.

[0038] On the other hand, the present invention provides a method for producing a solder paste battery assembly and its application in photovoltaic production.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The solder paste used in the present invention is a mixture of tin powder and rosin resin acid, which has simple ingredients and improves production efficiency. The rosin resin acid is both a solder paste viscosity controller and a solder flux during welding. The present invention performs pickling treatment on the connector before welding to remove surface oxides, thereby improving welding yield and welding efficiency. The present invention adopts argon cooling after welding to reduce cooling time after welding and improve production efficiency. At the same time, argon cooling can inhibit the reaction between the high-temperature welding part after welding and air, thereby improving electrical connection characteristics.

[0041] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the specific embodiments pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the steps of the method for producing a solder paste battery assembly of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present invention clearer, the implementation scheme of the present application will be described in detail below in conjunction with specific examples. The technical terms and scientific terms used in the present invention have the meanings generally understood by those of ordinary skill in the art to which the present invention belongs, without other definitions. Without departing from the concept of the present invention, those skilled in the art may make various improvements and changes to the specific implementation methods of the present invention specification, which all belong to the protection scope of the present invention. The raw materials used in the present invention are all commercially available unless otherwise specified.

[0044] like Figure 1 As shown, a method for producing a solder paste battery assembly comprises the following steps:

[0045] (1) Raw material preparation and pre-processing of solder paste battery components;

[0046] (2) Processing solder paste raw materials to obtain solder paste;

[0047] (3) coating printed solder paste on the photovoltaic cell to obtain a solder paste cell;

[0048] (4) Pre-welding treatment, welding treatment and post-welding treatment;

[0049] (5) Lamination packaging to obtain solder paste battery components.

[0050] Embodiment 1

[0051] (1) Raw material preparation and pre-processing of solder paste battery components;

[0052] Raw material preparation: prepare photovoltaic cells, solder paste raw materials (tin powder with a particle size of 25 μm) and connectors (copper strips with a width of 0.5 mm and a thickness of 0.2 mm);

[0053] Pre-processing: Use deionized water to continuously clean the connector for 1.5 minutes, then dry it at 45°C for 5 minutes; use 7% nitric acid solution to etch the connector for 5 minutes 。

[0054] (2) Processing solder paste raw materials to obtain solder paste;

[0055] 1000 parts of tin powder and 8 parts of rosin resin acid were mixed and stirred. The mixing speed was set to 45 r / min and the mixing time was 22 min. After mixing, the mixture was stored at 25°C.

[0056] (3) coating printed solder paste on the photovoltaic cell to obtain a solder paste cell;

[0057] The solder paste is evenly coated on the printing area of ​​the photovoltaic cell, the printing area is the main grid position corresponding to the photovoltaic cell, the width is 0.5mm, the coating scraper width exceeds the printing area by 50μm in the printing direction, and the scraper pressure is 8KG; the printing gap of the coating printing is 0.3mm, the printing roller temperature of the coating printing is 45°C, and the solder paste cell is obtained after coating and printing.

[0058] (4) Pre-welding treatment, welding treatment and post-welding treatment;

[0059] The pre-welding treatment includes: cleaning, disinfecting and preheating the welding equipment before welding; wherein the cleaning treatment includes cleaning the welding head with a brush; the disinfection treatment uses a 75% concentration of ethanol solution to disinfect the welding equipment; and the temperature of the preheating treatment is 180°C.

[0060] The welding process includes: placing the connector on the printed area coated with solder paste, the positive main grid of one of the adjacent solder paste battery cells in the multiple solder paste battery cells and the negative main grid of the other are located in the same straight line, the connector is placed along the straight line, and welding is performed at 230°C for 9s to obtain a solder paste battery string group. After welding and fixing, the positive and negative electrodes of the multiple solder paste battery cells are connected in series.

[0061] The post-weld treatment includes: cooling the solder paste battery string group with argon gas at a temperature of 18°C ​​for 10 seconds, and polishing and cleaning the welding parts after cooling.

[0062] (5) laminating and packaging to obtain solder paste battery components;

[0063] The solder paste battery string group is laminated and packaged using packaging materials (glass plate, POE film), the lamination packaging temperature is 130°C, the processing time is 15 minutes, and then it is left to cool at room temperature, and performance testing and packaging are performed to obtain solder paste battery components; wherein, the performance testing and packaging can be performed using conventional methods in the art.

[0064] Embodiment 2

[0065] (1) Raw material preparation and pre-processing of solder paste battery components;

[0066] Raw material preparation: prepare photovoltaic cells, solder paste raw materials (tin powder with a particle size of 45μm) and connectors (copper strip with a width of 0.8mm and a thickness of 0.25mm);

[0067] Pre-processing: Use deionized water to continuously clean the connector for 1.5 minutes, then dry it at 45°C for 5 minutes; use 7% nitric acid solution to etch the connector for 5 minutes 。

[0068] (2) Processing solder paste raw materials to obtain solder paste;

[0069] 1000 parts of tin powder and 12 parts of rosin resin acid were mixed and stirred. The mixing speed was set to 60 r / min and the mixing time was 25 min. After mixing, the mixture was stored at 25°C.

[0070] (3) coating printed solder paste on the photovoltaic cell to obtain a solder paste cell;

[0071] The solder paste is evenly coated on the printing area of ​​the photovoltaic cell, the printing area is the main grid position corresponding to the photovoltaic cell, the width is 1mm, the coating scraper width exceeds the printing area by 60μm in the printing direction, and the scraper pressure is 8.5KG; the printing gap of the coating printing is 0.6mm, the printing roller temperature of the coating printing is 47°C, and the solder paste cell is obtained after coating and printing.

[0072] (4) Pre-welding treatment, welding treatment and post-welding treatment;

[0073] The pre-welding treatment includes: cleaning, disinfecting and preheating the welding equipment before welding; wherein the cleaning treatment includes cleaning the welding head with a brush; the disinfection treatment uses a 75% concentration of ethanol solution to disinfect the welding equipment; and the temperature of the preheating treatment is 240°C.

[0074] The welding process includes: placing the connector on the printed area coated with solder paste, the positive main grid of one of the adjacent solder paste battery cells in multiple solder paste battery cells and the negative main grid of the other are located in the same straight line, the connector is placed along the straight line, and welding is performed at 260°C for 7s to obtain a solder paste battery string group. After welding and fixing, the positive and negative electrodes of multiple solder paste battery cells are connected in series.

[0075] The post-weld treatment includes: cooling the solder paste battery string group with argon gas at a temperature of 15°C for 10 seconds, and grinding and cleaning the welding parts after cooling.

[0076] (5) laminating and packaging to obtain solder paste battery components;

[0077] The solder paste battery string group is laminated and packaged using packaging materials (glass plate, POE film), the lamination packaging temperature is 140°C, the processing time is 18 minutes, and then it is left to cool at room temperature, and performance testing and packaging are performed to obtain solder paste battery components; wherein, the performance testing and packaging can be carried out by conventional methods in the field.

[0078] Embodiment 3

[0079] (1) Raw material preparation and pre-processing of solder paste battery components;

[0080] Raw material preparation: prepare photovoltaic cells, solder paste raw materials (tin powder with a particle size of 35μm) and connectors (copper strip with a width of 0.6mm and a thickness of 0.0.16mm);

[0081] Pre-processing: Use deionized water to continuously clean the connector for 2 minutes, then dry it at 48°C for 4 minutes; use 5% nitric acid solution to etch the connector for 6 minutes 。

[0082] (2) Processing solder paste raw materials to obtain solder paste;

[0083] 1000 parts of tin powder and 8 parts of rosin resin acid were mixed and stirred. The mixing speed was set to 30 r / min and the mixing time was 18 min. After mixing, the mixture was stored at 25°C.

[0084] (3) coating printed solder paste on the photovoltaic cell to obtain a solder paste cell;

[0085] The solder paste is evenly coated on the printing area of ​​the photovoltaic cell, the printing area is the main grid position corresponding to the photovoltaic cell, the width is 0.7mm, the coating scraper width exceeds the printing area by 55μm in the printing direction, and the scraper pressure is 7.8KG; the printing gap of the coating printing is 0.01mm, the printing roller temperature of the coating printing is 45°C, and the solder paste cell is obtained after coating and printing.

[0086] (4) Pre-welding treatment, welding treatment and post-welding treatment;

[0087] The pre-welding treatment includes: cleaning, disinfecting and preheating the welding equipment before welding; wherein the cleaning treatment includes cleaning the welding head with a brush; the disinfection treatment uses a 75% concentration of ethanol solution to disinfect the welding equipment; and the temperature of the preheating treatment is 200°C.

[0088] The welding process includes: placing the connector on the printed area coated with solder paste, the positive main grid of one of the adjacent solder paste battery cells in multiple solder paste battery cells and the negative main grid of the other are located in the same straight line, the connector is placed along the straight line, and welding is performed at 240°C for 8s to obtain a solder paste battery string group. After welding and fixing, the positive and negative electrodes of multiple solder paste battery cells are connected in series.

[0089] The post-weld treatment includes: cooling the solder paste battery string group with argon gas at a temperature of 15°C for 10 seconds, and grinding and cleaning the welding parts after cooling.

[0090] (5) laminating and packaging to obtain solder paste battery components;

[0091] The solder paste battery string group is laminated and packaged using packaging materials (glass plate, POE film), the lamination packaging temperature is 140°C, the processing time is 18 minutes, and then it is left to cool at room temperature, and performance testing and packaging are performed to obtain solder paste battery components; wherein, the performance testing and packaging can be carried out by conventional methods in the field.

[0092] Embodiment 4

[0093] (1) Raw material preparation and pre-processing of solder paste battery components;

[0094] Raw material preparation: prepare photovoltaic cells, solder paste raw materials (tin powder with a particle size of 40μm) and connectors (aluminum strip with a width of 0.7mm and a thickness of 0.0.2mm);

[0095] Pre-processing: Use deionized water to continuously clean the connector for 2 minutes, then dry it at 48°C for 4 minutes; use 6% nitric acid solution to etch the connector for 7 minutes 。

[0096] (2) Processing solder paste raw materials to obtain solder paste;

[0097] 1000 parts of tin powder and 10 parts of rosin resin acid were mixed and stirred. The mixing speed was set to 50 r / min and the mixing time was 20 min. After mixing, the mixture was stored at 25°C.

[0098] (3) coating printed solder paste on the photovoltaic cell to obtain a solder paste cell;

[0099] The solder paste is evenly coated on the printing area of ​​the photovoltaic cell, the printing area is the main grid position corresponding to the photovoltaic cell, the width is 0.7mm, the coating scraper width exceeds the printing area by 58μm in the printing direction, and the scraper pressure is 8.2KG; the printing gap of the coating printing is 0.01mm, the printing roller temperature of the coating printing is 45°C, and the solder paste cell is obtained after coating and printing.

[0100] (4) Pre-welding treatment, welding treatment and post-welding treatment;

[0101] The pre-welding treatment includes: cleaning, disinfecting and preheating the welding equipment before welding; wherein the cleaning treatment includes cleaning the welding head with a brush; the disinfection treatment uses a 75% concentration of ethanol solution to disinfect the welding equipment; and the temperature of the preheating treatment is 230°C.

[0102] The welding process includes: placing the connector on the printed area coated with solder paste, the positive main grid of one of the adjacent solder paste battery cells in multiple solder paste battery cells and the negative main grid of the other are located in the same straight line, the connector is placed along the straight line, and welding is performed at 230°C for 8s to obtain a solder paste battery string group. After welding and fixing, the positive and negative electrodes of multiple solder paste battery cells are connected in series.

[0103] The post-weld treatment includes: cooling the solder paste battery string group with argon gas at a temperature of 18°C ​​for 10 seconds, and polishing and cleaning the welding parts after cooling.

[0104] (5) laminating and packaging to obtain solder paste battery components;

[0105] The solder paste battery string group is laminated and packaged using packaging materials (glass plate, POE film), the lamination packaging temperature is 140°C, the processing time is 18 minutes, and then it is left to cool at room temperature, and performance testing and packaging are performed to obtain solder paste battery components; wherein, the performance testing and packaging can be carried out by conventional methods in the field.

[0106] Comparative Example 1

[0107] The difference from the first embodiment is that the solder paste adopts the existing conventional solder paste. Among them, the components of the conventional solder paste include 85-90% solder powder and 10-15% flux; the solder powder is generally tin powder or tin alloy powder; the common flux generally includes 40-50% rosin, 10-15% organic acid, and the balance is organic solvent.

[0108] Specifically, the solder paste in the comparative example is composed of 90% tin powder and 10% soldering flux (50% of the soldering flux is rosin).

[0109] The welding effect of the battery string after welding is similar, and the material composition of Example 1 is simpler.

[0110] Comparative Example 2

[0111] The difference from the first embodiment is that no pre-processing treatment or pre-welding treatment is performed.

[0112] After welding, some solder paste of the battery string group fell off and the welding was not firm.

[0113] Comparative Example 3

[0114] The difference from the first embodiment is that the post-welding treatment is to place the solder paste battery string group in a room temperature environment to cool down and then polish and clean the welding parts.

[0115] The welding strength test of the battery string group after welding of Example 1 and Comparative Example 3 was performed, and then the battery assembly obtained after lamination was subjected to an electrical performance test and a thermal cycle test (TC) 400h, and the performance test table in Table 1 was obtained. The welding strength test of Comparative Example 3 was lower than that of Example 1, the power data of the electrical performance test was lower than that of Example 1, and the TC400h experimental pass rate was lower than that of Example 1, indicating that the long cooling process time will allow the welding part to have sufficient reaction time with the air, which will affect the quality performance of the weld.

[0116] Table 1. Performance test table

[0117]

[0118] The production method of the present invention uses a simple solder paste raw material component, but the welding is firm and not easy to fall off, surface cleaning can improve the adhesion of the solder paste and increase the welding firmness, and the use of argon gas cooling reduces the cooling time after welding and improves the electrical connection characteristics, thereby improving the welding efficiency and the production efficiency and reducing the cost of the production method.

[0119] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for producing a solder paste battery assembly, characterized in that: The following steps are involved: Processing solder paste raw materials to obtain solder paste; the solder paste raw materials include tin powder and rosin resin acid, and the amount of rosin resin acid added is 0.8-1.2% of the mass of the solder paste raw materials; Applying printed solder paste on photovoltaic cells to obtain solder paste cells; Pre-welding treatment, welding treatment and post-welding treatment; Lamination packaging to obtain solder paste battery components.

2. The production method according to claim 1, characterized in that The particle size of the tin powder is 25-45 μm.

3. The production method according to claim 1, characterized in that The processing of solder paste raw materials to obtain solder paste comprises: mixing tin powder and rosin resin acid to obtain solder paste; the mixing and stirring speed is 30-60r / min, and the mixing and stirring time is 18-25min.

4. The production method according to claim 1, characterized in that Before processing the solder paste raw materials to obtain the solder paste, it also includes raw material preparation and pre-processing treatment of the solder paste battery components.

5. The production method according to claim 4, characterized in that: The raw material preparation includes: preparing photovoltaic cells, solder paste raw materials and connectors; The pre-processing treatment includes: cleaning the connecting parts and etching the connecting parts.

6. The production method according to claim 1, characterized in that: The method of coating and printing solder paste on a photovoltaic cell to obtain a solder paste cell comprises: coating the solder paste evenly on a printing area of ​​the photovoltaic cell to obtain a solder paste cell after coating and printing; the printing area is a main grid position corresponding to the photovoltaic cell, and the main grid width is 0.5-1.0 mm.

7. The production method according to claim 1, characterized in that: The welding process includes: placing a connector on a printed area coated with solder paste, and welding and fixing a plurality of solder paste battery cells to obtain a solder paste battery string group; the welding temperature of the welding and fixing is 230-260° C., and the welding time is 5-10s.

8. The production method according to claim 1, characterized in that: The post-weld treatment includes: cooling the solder paste battery string group, and grinding and cleaning the welding parts after cooling; the cooling is argon gas blowing cooling.

9. The production method according to claim 1, characterized in that: The lamination packaging to obtain the solder paste battery assembly includes: using packaging materials to perform lamination packaging, cooling, performance testing, and packaging on the solder paste battery string group to obtain the solder paste battery assembly; the lamination packaging temperature is 130-140° C., and the processing time is 15-18 minutes.

10. Application of the method for producing a solder paste battery assembly according to any one of claims 1 to 9 in photovoltaic production.

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