Back contact solar cell welding tool

Abstract

The utility model discloses a kind of back contact type solar cell piece welding tool, belong to cell piece welding equipment technical field.A kind of back contact type solar cell piece welding tool, including several adsorption bottom plate units, each adsorption bottom plate unit is used to correspond to carry a piece of cell piece to be welded;Adsorption bottom plate unit includes welding adsorption bottom plate, heat preservation component and more than one solder strip guiding device;Welding adsorption bottom plate is directly or indirectly erected above heat preservation component;The top of welding adsorption bottom plate is equipped with more than one mounting groove;Solder strip guiding device is respectively embedded in corresponding mounting groove, for the positioning of solder strip;Several through slots are perforated on welding adsorption bottom plate, and through slot is arrayed in the length direction and width direction of adsorption bottom plate unit, to form openwork structure, and form support part between adjacent through slot, to be used to support cell piece;So set, without auxiliary positioning tool positioning is realized, and solder strip can also realize positioning.

Description

Technical Field

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

[0002] In existing solar cell welding processes, external auxiliary positioning fixtures are typically used to position the solar cells. This requires a complete set of positioning auxiliary fixtures to position the solar cells to be welded, forming a complete reflow structure to complete the fixture handling and reflow actions. As a result, the equipment cost is high, the mechanism is relatively complex, and the equipment debugging difficulty and maintenance cost are also high. Furthermore, the welding strip is generally positioned by an external mechanism, which makes it easy for misalignment to occur. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a tooling for welding back-contact solar cells, which can achieve the positioning of the solar cells without additional auxiliary positioning tooling, and the welding strip can also be positioned.

[0004] This utility model discloses a back-contact solar cell welding fixture, comprising several adsorption base plate units, each adsorption base plate unit being used to support a solar cell to be welded; the adsorption base plate unit includes a welding adsorption base plate, a heat insulation component, and one or more welding strip guiding devices; the welding adsorption base plate is directly or indirectly mounted above the heat insulation component; the top of the welding adsorption base plate is provided with one or more mounting grooves; the welding strip guiding devices are respectively embedded in the corresponding mounting grooves for positioning the welding strips. Several through slots are provided through the welding adsorption base plate. The through slots are arranged in an array in both the length and width directions of the adsorption base plate unit to form a hollow structure. Support parts are formed between adjacent through slots to support the battery cells.

[0005] As a further improvement of this utility model, when the battery cell is being welded on the welding adsorption base plate, the welding pads on the battery cell are positioned above the through groove.

[0006] As a further improvement of this utility model, the heat preservation component includes several infrared lamps and a lamp holder; the bottom of both ends of the welding adsorption base plate are respectively detachably and directly or indirectly disposed on the top of the lamp holder, and the infrared lamps are installed below the welding adsorption base plate; the two ends of the infrared lamps are fixedly connected to the lamp holder.

[0007] As a further improvement of this utility model, in the width direction of the adsorption base plate unit, two or more support parts are directly or indirectly connected to form a load-bearing part. The mounting slots are sequentially arranged on the corresponding support parts along the length of the adsorption base plate unit to form a mounting array.

[0008] As a further improvement of this utility model, the mounting array is provided in two sets, which are respectively arranged on both sides of the top of the welding adsorption base plate along the width direction of the adsorption base plate unit. Furthermore, the two sets of mounting arrays are symmetrically arranged on both sides along the width direction of the adsorption base plate unit.

[0009] As a further improvement of this utility model, the welding strip guiding device includes a pressure rod, two elastic elements and two positioning pins; the mounting groove includes a horizontal groove and two slots, with the two ends of the horizontal groove respectively communicating through the corresponding slots; the positioning pins are slidably embedded in the corresponding slots; the bottom of the positioning pins is recessed upwards to form a receiving groove; the upper end of the elastic element is embedded in the receiving groove at the bottom of the positioning pin and abuts against the top of the receiving groove; the bottom of the elastic element and the bottom of the slots abut against each other. Each slot has a slidably embedded positioning pin with a clamping groove at the top for clamping the welding strip; the pressure rod is embedded in the transverse groove with its two ends embedded in the clamping groove.

[0010] As a further improvement of this utility model, the clamping groove is arranged in a "+" shape, including a horizontal groove and a vertical groove; The transverse grooves on the two positioning pins in the same mounting slot are symmetrically arranged along the central axis L of the adsorption base plate unit, and the two ends of the pressure rod are respectively embedded in the corresponding transverse grooves. The welding strip guide devices, which are set on two sets of symmetrical mounting arrays, are also symmetrically arranged in pairs, and the positioning pins of the welding strip guide devices are also symmetrically arranged one by one. The longitudinal grooves on the two symmetrically arranged positioning pins are symmetrically arranged along the central axis of the width direction of the adsorption base plate unit to form positioning grooves and realize the positioning of the welding strip.

[0011] As a further improvement of this utility model, the welding adsorption base plate is provided with one or more first air channels through the length direction of the adsorption base plate unit, and a number of second air channels through the width direction of the adsorption base plate unit; the first air channels and the second air channels are arranged in an intersecting manner, and the second air channels are connected through the first air channels.

[0012] As a further improvement of this utility model, the top of the support part is recessed and provided with several adsorption grooves. Each adsorption groove of the support part is provided with a corresponding second air channel below it, and each adsorption groove and the corresponding second air channel are connected through each other.

[0013] As a further improvement of this utility model, the welding adsorption base plate has one or more heating channels extending through the length of the adsorption base plate unit, and heating elements are embedded in the heating channels to provide heating temperature for welding the battery cells.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting an installation groove and a welding strip guide device on the welding adsorption base plate, precise positioning of the welding strip can be achieved, avoiding displacement of the welding strip during the welding process and improving the reliability of battery cell welding. The welding adsorption base plate is equipped with through slots, heating channels, and heat preservation components. The through slot structure ensures that the solder pads of the battery cells are directly facing the through slots, which facilitates the heating of the solder joints. The heating elements in the heating channels work together with the infrared lamps to ensure that the welding area is heated evenly and to reduce the risk of poor soldering. The hollowed-out adsorption base plate structure reduces heat loss in non-welding areas; the insulation component preheats or insulates the tooling during welding gaps, reducing heating energy consumption and improving heating efficiency. The adsorption base plate unit is equipped with air channels and adsorption grooves, which can be evacuated by external air extraction equipment to adsorb and fix the battery cells, avoiding damage caused by movement or vibration; at the same time, the support and load-bearing structure reduces warping caused by uneven heating of the battery cells and improves yield. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the welding fixture of this utility model; Figure 2 This is a schematic diagram of the adsorption base plate unit structure of this utility model; Figure 3 This is a side view of the adsorption base plate unit of this utility model. Figure 4 This is a schematic diagram of the welding strip guiding device 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 component; 221. Infrared lamp tube; 23. Welding strip guide device; 231. Positioning pin; 2311. Clamping groove; 233. Pressure rod; 24. Support plate; 3. Lamp holder; 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... Figure 1 - Figure 4A back-contact solar cell welding fixture includes several 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 a heat insulation component 22, a welding adsorption base plate 21, and one or more welding strip guiding devices 23; the heat insulation component 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 component 22 includes a heating unit to provide the temperature required for insulation; the temperature setting of the heating unit of the insulation component 22 during use is set according to the lowest melting point of the solder paste or solder strip used for soldering, and the temperature of the heating unit of the insulation component 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 heating unit includes several infrared lamps 221 and a lamp holder 3; support plates 24 are respectively installed and connected to the bottom of both ends of the welding adsorption base plate 21; the two support plates 24 are respectively detachably installed on the top of the lamp holder 3, and the welding adsorption base plate 21 is supported on the top of the lamp holder 3 through the support plates 24; the infrared lamps 221 are installed below the welding adsorption base plate 21; the two ends of the infrared lamps 221 are fixedly connected to the lamp holder 3.

[0024] The top of the welding adsorption base plate 21 is recessed with several welding strip grooves to support the welding strip. In one embodiment, the welding strip groove is located in the middle of the welding adsorption base plate 21; the welding adsorption base plate 21 on both sides of the welding strip groove is provided with several through grooves. The channels are arranged in an array along both the length direction L and the width direction W of the adsorption base plate unit 2 to form a hollow structure.

[0025] Each cutout position corresponds to a pad point (soldering pad) of battery cell 1. That is, during the soldering process of battery cell 1, the pad point (soldering pad) above the through slot corresponds to the pad point (soldering pad) of battery cell 1.

[0026] Along the length direction L of the adsorption base plate unit 2, corresponding support parts are formed between adjacent through slots; along the width direction W of the adsorption base plate unit 2, two or more support parts are directly or indirectly connected to form a load-bearing part.

[0027] 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.

[0028] 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.

[0029] The first air passage 211 is disposed at both ends of the welded adsorption base plate 21 along the width direction W of the adsorption base plate unit 2.

[0030] Each support unit has a second air channel 212 extending through it along the width direction W of the adsorption base plate unit 2.

[0031] The top of the support section is recessed and has several adsorption grooves; the adsorption grooves are connected to the second air channel 212 on the support section.

[0032] The first gas channel 211 has plugs installed at both ends; the plugs are connected to an external vacuuming device, which extracts the gas from each gas channel, and then adsorbs the battery cell 1 to be welded through the adsorption tank connected to the gas channel.

[0033] The welding adsorption base plate 21 has one or more heating channels 213 extending through the length L of the adsorption base plate unit 2. Heating elements are embedded in the heating channels 213, and the heating elements provide heating temperature for the welding of the battery cell 1.

[0034] The heating channel 213 is located above the first air channel 211 and the second air channel 212.

[0035] The mounting slots are sequentially arranged on the corresponding bearing parts along the length L of the adsorption base plate unit 2 to form a mounting array; The mounting array is provided in two sets, which are respectively located on both sides of the top of the welding adsorption base plate 21 along the width direction W of the adsorption base plate unit 2.

[0036] The two sets of mounting arrays are symmetrically arranged along the central axis W of the width direction of the adsorption base plate unit 2; therefore, the welding strip guide device 23 in the mounting groove is also symmetrically arranged along the central axis.

[0037] The welding strip guiding device 23 includes a pressure rod 233, two elastic elements and two positioning pins 231; the mounting groove includes a horizontal groove and two slots, and the positioning pins 231 are slidably embedded in the corresponding slots; the bottom of the positioning pins 231 is recessed upward to form a receiving groove; the upper end of the elastic element is embedded in the receiving groove at the bottom of the positioning pin 231 and abuts against the top of the receiving groove; the bottom of the elastic element and the bottom of the slot are abutted against each other.

[0038] Each slot is fitted with a positioning pin 231, and the top of the positioning pin 231 is provided with a clamping groove for clamping the welding strip; the pressure rod 233 is fitted in the transverse groove, and the two ends of the pressure rod 233 are respectively fitted in the clamping groove.

[0039] Preferably, the clamping groove is arranged in a cross shape, including a transverse groove and a longitudinal groove; the transverse groove and the longitudinal groove are arranged intersectingly to form the clamping groove.

[0040] The transverse grooves on the two positioning pins 231 in the same mounting slot are symmetrically arranged along the central axis of the length direction L of the adsorption base plate unit 2, and the two ends of the pressure rod 233 are respectively embedded in the corresponding transverse grooves.

[0041] The welding strip guide devices 23 are symmetrically arranged on the two sets of symmetrically arranged mounting arrays, and the positioning pins 231 of the welding strip guide devices 23 are also symmetrically arranged one by one; the longitudinal grooves on the two symmetrically arranged positioning pins 231 are symmetrically arranged along the central axis of the width direction of the adsorption base plate unit 2 to form positioning grooves and realize the positioning of the welding strip.

[0042] Preferably, the elastic element is a spring.

[0043] 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 the welding operation, the infrared lamps 221 installed in the heat insulation component 22 are 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 opposite positioning slots to position the welding strip. Then, the battery cell 1 is placed. 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 welding adsorption base plate 21 starts to work and performs the welding operation. After the welding is completed, the heating element of the welding adsorption base plate 21 stops working. 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; The welding adsorption base plate 21 is hollowed out to reduce heat loss during the heating process and reduce power consumption.

[0044] 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 tooling for welding back-contact solar cells, characterized in that: It includes several adsorption base plate units (2), each adsorption base plate unit (2) is used to support a battery cell (1) to be welded; the adsorption base plate unit (2) includes a welding adsorption base plate (21), a heat insulation component (22) and one or more welding strip guide devices (23); the welding adsorption base plate (21) is directly or indirectly mounted above the heat insulation component (22); the top of the welding adsorption base plate (21) is provided with one or more mounting grooves; the welding strip guide devices (23) are respectively embedded in the corresponding mounting grooves for positioning the welding strip; Several through slots are provided on the welding adsorption base plate (21). The through slots are arranged in an array in both the length and width directions of the adsorption base plate unit (2) to form a hollow structure, and a support part is formed between adjacent through slots to support the battery cell (1).

2. The tooling for welding back-contact solar cells according to claim 1, characterized in that: When the battery cell (1) is welded on the welding adsorption base plate (21), the welding pads set on the battery cell (1) are above the through slot.

3. The tooling for welding back-contact solar cells according to claim 1, characterized in that: The heat insulation component (22) includes several infrared lamps (221) and a lamp holder (3); the bottom of both ends of the welding adsorption base plate (21) are detachably mounted directly or indirectly on the top of the lamp holder (3), and the infrared lamps (221) are installed below the welding adsorption base plate (21); the two ends of the infrared lamps (221) are fixedly connected to the lamp holder (3).

4. The tooling for welding back-contact solar cells according to claim 1, characterized in that: In the width direction of the adsorption base plate unit (2), two or more support parts are directly or indirectly connected to form a load-bearing part; The mounting slots are sequentially arranged on the corresponding bearing parts along the length direction of the adsorption base plate unit (2) to form a mounting array.

5. The tooling for welding back-contact solar cells according to claim 4, characterized in that: The mounting array is provided in two sets, which are respectively set on both sides of the top of the welding adsorption base plate (21) along the width direction of the adsorption base plate unit (2); The two sets of mounting arrays are symmetrically arranged on both sides of the width direction of the adsorption base plate unit (2).

6. The tooling for welding back-contact solar cells according to claim 1, characterized in that: The welding strip guiding device (23) includes a pressure rod (233), two elastic elements and two positioning pins (231); the mounting groove includes a horizontal groove and two slots, with the two ends of the horizontal groove communicating through the corresponding slots respectively; the positioning pins (231) are slidably embedded in the corresponding slots; the bottom of the positioning pins (231) is recessed upward to form a receiving groove; the upper end of the elastic element is embedded in the receiving groove at the bottom of the positioning pins (231) and abuts against the top of the receiving groove; the bottom of the elastic element and the bottom of the slots abut against each other. Each slot has a locating pin (231) that is slidably embedded in it. The top of the locating pin (231) has a clamping groove for clamping the welding strip. The pressure rod (233) is embedded in the transverse groove, and the two ends of the pressure rod (233) are respectively embedded in the clamping groove.

7. The tooling for welding back-contact solar cells according to claim 5, characterized in that: The clamping groove is arranged in a cross shape, including a horizontal groove and a vertical groove; The transverse grooves on the two positioning pins (231) in the same mounting slot are symmetrically arranged along the central axis of the length direction L of the adsorption base plate unit (2), and the two ends of the pressure rod (233) are respectively embedded in the corresponding transverse grooves; The welding strip guide devices (23) set on the two sets of symmetrical mounting arrays are also symmetrically arranged in pairs, and the positioning pins (231) of the welding strip guide devices (23) are also symmetrically arranged one by one; the longitudinal grooves on the two symmetrically arranged positioning pins (231) are symmetrically arranged along the central axis of the width direction of the adsorption base plate unit (2) to form positioning grooves and realize the positioning of the welding strip.

8. The tooling for welding back-contact solar cells according to claim 1, characterized in that: The welding adsorption base plate (21) has one or more first air channels (211) through it along the length direction of the adsorption base plate unit (2), and several second air channels (212) through it along the width direction 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 the second air channels (212) are connected through the first air channels (211).

9. The tooling for welding back-contact solar cells according to claim 8, characterized in that: The top of the support unit is recessed and has several adsorption grooves. Each adsorption groove of the support unit has a corresponding second air channel (212) below it. Each adsorption groove and the corresponding second air channel (212) are connected through each other.

10. The tooling for welding back-contact solar cells according to claim 1, characterized in that: The welding adsorption base plate (21) has one or more heating channels (213) extending through the length of the adsorption base plate unit (2). Heating elements are embedded in the heating channels (213) to provide heating temperature for welding the battery cell (1).

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