A back contact type solar cell welding device

Abstract

The utility model discloses a kind of back contact type solar cell piece welding devices, belong to cell piece welding equipment technical field.A kind of back contact type solar cell piece welding device, including more than one adsorption bottom plate unit, the adsorption bottom plate unit includes heat preservation bottom plate and welding adsorption bottom plate;Welding adsorption bottom plate is installed in the top of heat preservation bottom plate, and welding adsorption bottom plate is provided with gas path adsorption system and heating system in;Welding adsorption bottom plate is communicated through gas path adsorption system with the space of the upper side of welding adsorption bottom plate;Heating system provides heating temperature for welding adsorption bottom plate, to complete the welding of cell piece;The inside of heat preservation bottom plate is equipped with heating unit for providing heat preservation temperature, to be used to keep welding adsorption bottom plate at preset temperature;So set, simplify welding mechanism, need not positioning extra tooling.

Description

Technical Field

[0001] This utility model belongs to the technical field of battery cell welding equipment, and more specifically, relates to a back-contact solar cell welding device. Background Technology

[0002] Stringing solar cells typically requires precise positioning and stable welding between the cells and the solder ribbon to ensure the reliability of the cells' electrical performance and product consistency. Currently, conventional solar cell stringing machines both domestically and internationally generally adopt infrared heating welding, which involves placing the solder ribbon and cells in sequence, then relying on additional tooling for positioning, and using infrared heating to provide the heat required for welding. This method usually requires a set of tooling to form a reflow mechanism to complete the tooling handling and reflow actions, resulting in higher equipment costs and a more complex mechanism. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a back-contact solar cell welding device, which can simplify the welding mechanism of the solar cells.

[0004] This utility model provides a back-contact solar cell welding device, which includes one or more adsorption base plate units, wherein the adsorption base plate unit includes an insulation base plate and a welding adsorption base plate. The welding adsorption base plate is installed on top of the insulation base plate. The welding adsorption base plate is equipped with a gas adsorption system and a heating system. The welding adsorption base plate is connected to the space above it through the gas adsorption system. The heating system provides heating temperature to the welding adsorption base plate to complete the welding of the battery cells. The interior of the insulation base plate is equipped with a heating unit to provide insulation temperature, so as to keep the welding adsorption base plate at a preset temperature.

[0005] As a further improvement of this utility model, a welding strip guide device is installed on the top of the welding adsorption base plate. The welding strip guide device includes a mounting part with a slot, a positioning pin that can slide in the slot, and an elastic element that acts on the positioning pin. The top of the positioning pin is provided with a clamping groove for positioning the welding strip.

[0006] As a further improvement of this utility model, the top of the welding adsorption base plate is provided with a welding strip groove for supporting the welding strip, and a support part for supporting the battery cell is formed between the welding strip grooves; the top of the support part is provided with a number of adsorption grooves, and the adsorption grooves are connected to the gas furnace adsorption system.

[0007] As a further improvement of this utility model, the gas path adsorption system includes one or more first gas channels arranged along the length direction of the welded adsorption base plate, one or more second gas channels arranged along the width direction of the adsorption base plate unit, and a connecting channel that connects the adsorption tank on the support part with the second gas channels.

[0008] As a further improvement of this utility model, the first air passage and the second air passage are arranged in a cross pattern, and each second air passage is connected through the first air passage.

[0009] As a further improvement of this utility model, the heating system includes a heating channel disposed inside the welding adsorption base plate and a heating element embedded in the heating channel; the heating element provides heating temperature for welding the battery cells.

[0010] As a further improvement of this utility model, the positioning pin includes a guide post, a limiting block, and a guide post; the limiting block is fixedly disposed on the top of the guide post, and the guide post is fixedly disposed on the top of the limiting block; a clamping groove is formed on the top of the guide post for positioning the welding strip; the maximum outer diameter of the limiting block is greater than that of the guide post and the guide post respectively, and the two ends of the limiting block protrude beyond the maximum outer circumferential diameter of the guide post and the guide post to form a limiting part.

[0011] As a further improvement of this utility model, the slot includes a bottom groove, a middle groove and an upper groove in sequence along the vertical direction of the welding adsorption base plate. A first step is formed between the bottom groove and the middle groove, and a second step is formed between the middle groove and the upper groove. A blocking part is formed at the top of the upper groove along the width direction of the adsorption base plate unit. The limiting part of the positioning pin is located below the blocking part.

[0012] As a further improvement of this utility model, the elastic element is a spring, which is disposed between the receiving groove recessed at the bottom of the positioning pin and the bottom of the slot.

[0013] As a further improvement of this utility model, the welding strip guiding device is provided in two sets. The positioning pins on the two sets of welding strip guiding devices are arranged opposite to each other in the width direction of the adsorption base plate unit, and the clamping grooves on the two opposite positioning pins are arranged symmetrically along the central axis in the width direction of the adsorption base plate unit to form positioning grooves for positioning the welding strip.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting up a combined structure of a welding adsorption base plate and an insulation base plate, the welding adsorption base plate is used to provide welding temperature, and the insulation base plate is used to maintain the overall tooling in a preset insulation state, thereby realizing zoned temperature control in the cell welding process and ensuring the stability of the welding process and the quality of the weld points. An air adsorption system is set up inside the welding adsorption base plate. The adsorption tank is connected to each air channel, and the air is pumped out by an externally installed air extraction device. This achieves stable adsorption of the battery cells during the battery cell welding process, prevents the battery cells from shifting position, and improves the welding accuracy. The positioning groove formed by the clamping groove on the positioning pin of the welding strip guide device positions the welding strip, and the positioning pin is automatically raised and lowered by the elastic element, which ensures the stability and accuracy of the welding strip during the welding process and avoids the welding strip from shifting. A welding platform can be formed by multiple adsorption base plate units, which can be configured according to the number of cells in the target battery string, and the welding operation of the entire battery string can be completed in one go, significantly improving production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the battery cell of this utility model placed on the adsorption base plate unit; Figure 2 This is a schematic diagram of the adsorption base plate unit structure of this utility model; Figure 3 This is a schematic diagram of the positioning pin structure of this utility model; Figure 4 This is a schematic diagram of the slot cross-sectional structure of this utility model; Figure 5 This is a cross-sectional structural diagram of the slot and positioning pin of this utility model.

[0016] Explanation of the labels in the diagram: 1. Battery cell; 2. Adsorption base plate unit; 21. Welding adsorption base plate; 211. First air channel; 212. Second air channel; 213. Heating channel; 22. Insulation base plate; 23. Welding strip guide device; 231. Positioning pin; 2311. Clamping groove; 2312. Guide post; 2313. Limiting block; 2314. Guide post; 2315. Receiving groove; 232. Mounting component; 251. Bottom groove; 252. Middle groove; 253. Upper groove; L represents the length direction; W represents the width direction. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0018] Figure 2 As shown in the figure, L is the length direction of the adsorption base plate unit 2, and W is the width direction of the adsorption base plate unit 2.

[0019] Specific Implementation Example 1: Please refer to Figures 1-5A back-contact solar cell welding device includes one or more adsorption base plate units 2. The number of adsorption base plate units 2 is determined by the number of individual solar cells 1 of the target solar cell string product. Each adsorption base plate unit 2 corresponds to one solar cell 1.

[0020] The adsorption base plate unit 2 includes an insulation base plate 22, a welding adsorption base plate 21, and one or more welding strip guiding devices 23; the insulation base plate 22 is installed at the bottom of the welding adsorption base plate 21; the top of the welding adsorption base plate 21 has one or more mounting grooves; the welding strip guiding device 23 is embedded in the corresponding mounting groove.

[0021] The insulation base plate 22 is equipped with a heating unit to provide the temperature required for insulation. The temperature setting of the heating unit of the insulation base plate 22 during use is based on the lowest melting point of the solder paste or solder strip used for soldering. The temperature of the heating unit of the insulation base plate 22 is lower than the lowest melting point of the solder paste or solder strip used for soldering.

[0022] Temperature sensors are arranged on both sides of the welding adsorption base plate 21 to monitor the temperature of the welding adsorption base plate 21.

[0023] The top of the welding adsorption base plate 21 is recessed and has several welding strip grooves for supporting the welding strips; a support part is formed between adjacent welding strip grooves for supporting the battery cell 1; the support part is raised relative to the bottom of the welding strip groove.

[0024] The mounting slot and the welding strip slot are arranged at an angle; for example, the mounting slot and the welding strip slot are arranged perpendicularly.

[0025] The welding adsorption base plate 21 has one or more first air channels 211 extending through it along the length direction L of the adsorption base plate unit 2; the welding adsorption base plate 21 has several second air channels 212 extending through it along the width direction W of the adsorption base plate unit 2; the first air channels 211 and the second air channels 212 are arranged in a cross pattern, and each second air channel 212 is connected through the first air channel 211.

[0026] Plugs are installed at both ends of the first air passage 211.

[0027] Each support section has a corresponding second air passage 212 located below it.

[0028] The top of the support unit is recessed and has several adsorption grooves; the bottom of the adsorption grooves is provided with connecting channels, and the adsorption grooves are connected to the second air channel 212 below the corresponding support unit through the connecting channels.

[0029] The welding adsorption base plate 21 has several heating channels 213 extending through it along the length L of the adsorption base plate unit 2. Heating elements are embedded in the heating channels 213. The heating elements provide heating temperature for the welding of the battery cell 1.

[0030] The heating channel 213 is located above the first air channel 211 and the second air channel 212.

[0031] The welding strip guiding device 23 includes a mounting component 232, several elastic components and several positioning pins 231; the mounting component 232 has several slots extending from top to bottom, and a crossbar is fixedly installed at the bottom of the slot. The two ends of the crossbar are fixedly connected to the two sides of the bottom of the slot to form a grid at the bottom of the slot.

[0032] Each slot is fitted with a positioning pin 231, which includes a guide post 2312, a limiting block 2313, and a guide post 2314. The limiting block 2313 is fixedly disposed on the top of the guide post 2314, and the guide post 2312 is fixedly disposed on the top of the limiting block 2313. The top of the guide post 2312 is provided with a clamping groove 2311 for positioning the welding strip. The maximum outer diameter of the limiting block 2313 is larger than that of the guide post 2314 and the guide post 2312, and the two ends of the limiting block 2313 protrude beyond the maximum outer diameter of the guide post 2312 and the guide post 2314 to form a limiting part.

[0033] Preferably, the clamping groove 2311 is arranged in a "V" shape so that the welding strip can slide into the clamping groove 2311 along the groove opening.

[0034] The bottom of the guide post 2314 is recessed upward and has a receiving groove 2315. Each receiving groove 2315 is embedded with an elastic member. The top of the elastic member is in contact with the top of the receiving groove 2315, and the bottom of the elastic member is in contact with the block at the bottom of the slot. Preferably, the elastic element is a spring.

[0035] The slot includes a bottom slot 251, a middle slot 252, and an upper slot 253. The width of the bottom slot 251 along the length L of the adsorption base plate unit 2 is smaller than the width of the middle slot 252 along the length L of the adsorption base plate unit 2, and a first step layer is formed between the middle slot 252 and the bottom slot 251. The width of the middle slot 252 along the length L of the adsorption base plate unit 2 is smaller than the width of the upper slot 253 along the length L of the adsorption base plate unit 2, and a second step layer is formed between the upper slot 253 and the middle slot 252. The middle slot 252 is located at the top of the bottom slot 251, and the upper slot 253 is located at the top of the middle slot 252. The bottom slot 251, the middle slot 252, and the upper slot 253 are connected to each other to form a slot.

[0036] The outer diameter of the guide post 2314 matches the width of the middle groove 252 along the length direction L of the adsorption base plate unit 2, and the outer diameter of the elastic element matches the width of the bottom groove 251 along the length direction L of the adsorption base plate unit 2. The top of the slot, that is, the top of the upper slot 253, extends into the slot in the width direction W of the adsorption base plate unit 2 to form a blocking part; the limiting part of the limiting block 2313 is provided below the blocking part, and the positioning pin 231 is restricted in the slot by the blocking part and the limiting part.

[0037] Preferably, there are two mounting slots, symmetrically arranged on both sides of the top of the welding adsorption base plate; the welding strip guide devices in the mounting slots are symmetrically arranged; the positioning pins 231 of the welding strip guide devices are paired up and correspond one-to-one in the width direction W of the adsorption base plate unit 2; the clamping grooves 2311 on the two corresponding positioning pins 231 in the width direction of the adsorption base plate unit 2 are symmetrically arranged along the central axis to form positioning slots for positioning the welding strip.

[0038] Each strip groove is provided with a set of positioning grooves, which are arranged symmetrically with the strip grooves along the central axis.

[0039] Working principle: Multiple adsorption base plate units 2 form a complete battery cell 1 welding device. For example, a string of 12 cells is composed of 12 adsorption base plate units 2. 12 cells are welded at one time. The welding strip, battery cell 1, and the battery string after welding are all processed as a whole string. Before welding, the heating element of the insulation base plate 22 is in working condition to keep the tooling warm; During the welding process, the welding strip is first placed into the welding strip guide device 23, and then placed into two opposing clamping grooves 2311 to position the welding strip. Then, the battery cell 1 is placed, and the positioning pin 231 is pressed down by the pressure of the battery cell 1, pressing the elastic element downward, so that the welding strip and the battery cell 1 to be welded come into contact. After the welding strip and battery cell 1 to be welded are placed, the heating element of the heat insulation base plate 22 stops working, and the heating element of the welding adsorption base plate 21 starts working to carry out the welding operation. After the welding is completed, the heating element of the welding adsorption base plate 21 stops working, and the heating element of the heat insulation base plate 22 starts working again. After welding is completed, the entire string is moved away from the welding mechanism, and new welding strips and battery cells 1 are placed, and the above process is repeated.

[0040] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and its improved concept, should be covered within the scope of protection of this application.

Claims

1. A back-contact solar cell welding device, characterized in that: It includes one or more adsorption base plate units (2), wherein the adsorption base plate unit (2) includes an insulated base plate (22) and a welded adsorption base plate (21); The welding adsorption base plate (21) is installed on top of the heat insulation base plate (22). The welding adsorption base plate (21) is equipped with a gas adsorption system and a heating system. The welding adsorption base plate (21) is connected to the space above the welding adsorption base plate (21) through the gas adsorption system. The heating system provides heating temperature for the welding adsorption base plate (21) to complete the welding of the battery cell (1). The interior of the insulation base plate (22) is equipped with a heating unit for providing insulation temperature, so as to keep the welding adsorption base plate (21) at a preset temperature.

2. The back-contact solar cell welding device according to claim 1, characterized in that: A welding strip guide device (23) is installed on the top of the welding adsorption base plate (21). The welding strip guide device (23) includes a mounting part (232) with a slot, a positioning pin (231) that can slide in the slot, and an elastic element that acts on the positioning pin (231). The top of the positioning pin (231) is provided with a clamping groove (2311) for positioning the welding strip.

3. The back-contact solar cell welding device according to claim 1, characterized in that: The top of the welding adsorption base plate (21) is provided with a welding strip groove for carrying the welding strip, and a support part for carrying the battery cell (1) is formed between the welding strip grooves; the top of the support part is provided with several adsorption grooves, and the adsorption grooves are connected to the gas furnace adsorption system.

4. The back-contact solar cell welding device according to claim 3, characterized in that: The gas adsorption system includes one or more first gas channels (211) arranged along the length direction of the welded adsorption base plate (21), one or more second gas channels (212) arranged along the width direction of the adsorption base plate unit (2), and a connecting channel that connects the adsorption tank on the support part with the second gas channel (212).

5. The back-contact solar cell welding device according to claim 4, characterized in that: The first air passage (211) and the second air passage (212) are arranged in a cross pattern, and each second air passage (212) is connected through the first air passage (211).

6. The back-contact solar cell welding device according to claim 1, characterized in that: The heating system includes a heating channel (213) disposed inside the welding adsorption base plate (21) and a heating element embedded in the heating channel (213); the heating element provides heating temperature for welding the battery cell (1).

7. The back-contact solar cell welding device according to claim 2, characterized in that: The positioning pin (231) includes a guide post (2312), a limiting block (2313), and a guide post (2314); the limiting block (2313) is fixedly disposed on the top of the guide post (2314), and the guide post (2312) is fixedly disposed on the top of the limiting block (2313); the clamping groove (2311) is opened on the top of the guide post (2312) for positioning the welding strip; the maximum outer diameter of the limiting block (2313) is larger than that of the guide post (2314) and the guide post (2312), and the two ends of the limiting block (2313) protrude beyond the maximum outer diameter of the guide post (2312) and the guide post (2314) to form a limiting part.

8. The back-contact solar cell welding device according to claim 7, characterized in that: The slot includes a bottom groove (251), a middle groove (252) and an upper groove (253) in sequence along the vertical direction of the welding adsorption base plate (21). A first step is formed between the bottom groove (251) and the middle groove (252), and a second step is formed between the middle groove (252) and the upper groove (253). A blocking part is formed at the top of the upper groove (253) along the width direction of the adsorption base plate unit (2). The limiting part of the positioning pin (231) is located below the blocking part.

9. A back-contact solar cell welding device according to claim 2, characterized in that: The elastic element is a spring, which is located between the receiving groove (2315) recessed at the bottom of the positioning pin (231) and the bottom of the slot.

10. A back-contact solar cell welding device according to claim 2, characterized in that: The welding strip guiding device (23) is provided in two sets. The positioning pins (231) on the two sets of welding strip guiding devices (23) are arranged opposite to each other in the width direction of the adsorption base plate unit (2). The clamping grooves (2311) on the two opposite positioning pins (231) are arranged symmetrically along the central axis in the width direction of the adsorption base plate unit (2) to form positioning grooves for positioning the welding strip.

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