Laser enhanced injection metallization strengthening and repairing synchronization equipment

Abstract

The utility model provides laser enhanced injection metallization strengthening and repairing synchronization equipment, which comprises a first double-laser component, a second double-laser component, a second double-laser component, a first pressure monitoring mechanism and a second pressure monitoring mechanism, the first pressurization monitoring mechanism comprises a first lifting unit and a first pressing structure provided with a plurality of first probes, and the lifting end of the first lifting unit drives the first pressing structure to lift up and down; the second double-laser assembly comprises at least two second laser output heads and a second pressurization monitoring mechanism, and the second pressurization monitoring mechanism comprises a second lifting unit and a second pressing structure provided with a plurality of second probes; according to the utility model, metallization strengthening and repairing can be carried out on the batteries and assemblies, and the stability, the precision, the gain and the yield of production are provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser processing technical field especially relates to a laser enhancement injection metallization strengthening and repair synchronous equipment. BACKGROUND

[0002] In the development process of photovoltaic cell technology, the traditional process high-temperature sintering metallization needs silver paste etching to open the passivation layer to form ohmic contact. Good metallization effect needs to continuously optimize the paste formula to seek the precise balance of the advantages and disadvantages.

[0003] In the conduction mechanism of traditional high-temperature sintering metallization ohmic contact, silver microcrystals directly occupy the dominant position, supplemented by different types of tunneling indirect conduction. From the perspective of electrochemistry, the construction of direct conduction channel needs Ag+ dissolved in glass in sintering to obtain enough electron reduction to form silver microcrystals. The existing high-temperature sintering metal process has the following disadvantages:

[0004] 1. The process efficiency is not good, and more Ag-si cannot be combined more fully, resulting in high resistance and not reaching the best state of efficiency improvement.

[0005] 2. The equipment cost is high, and the related equipment and maintenance cost are also high.

[0006] 3. The instantaneous current is not enough for product processing, and in the processing stage, the processing width is large, resulting in insufficient instantaneous current intensity in the whole width and insufficient sintering. INVENTION CONTENTS

[0007] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a laser enhancement injection metallization strengthening and repair synchronous equipment, which has good efficiency improvement effect, can make more Ag-si combine more fully, has low resistance, and can sinter fully, can strengthen and repair the metallization of the battery and the assembly, and provides the stability, precision, gain and yield of production.

[0008] The embodiment of the utility model realizes the following technical schemes:

[0009] A laser enhancement injection metallization strengthening and repair synchronous equipment comprises:

[0010] A first double laser assembly comprises at least two first laser output heads and a first pressure monitoring mechanism, the first pressure monitoring mechanism comprises a first lifting unit and a first pressure structure provided with a plurality of first probes, and the lifting end of the first lifting unit drives the first pressure structure to rise and fall up and down.

[0011] The second dual laser assembly comprises at least two second laser output heads and a second pressure monitoring mechanism, the second pressure monitoring mechanism comprises a second lifting unit and a second pressure structure provided with a plurality of second probes, and the lifting end of the second lifting unit drives the second pressure structure to rise and fall.

[0012] The rotary table is provided with a second voltage loading end and a plurality of turntables for placing batteries, the first dual laser assembly is located above one of the turntables, and the second dual laser assembly is located above another of the turntables.

[0013] According to a preferred embodiment, the turntable is provided with a copper plate jig.

[0014] According to a preferred embodiment, one side of the rotary table is provided with a conveying assembly.

[0015] The number of the turntables comprises at least three.

[0016] The first turntable is located below the first dual laser assembly.

[0017] The second turntable is located below the second dual laser assembly.

[0018] The third turntable is located below the conveying assembly.

[0019] According to a preferred embodiment, a vision module is further included.

[0020] The number of the turntables comprises at least four.

[0021] The fourth turntable is located below the vision module.

[0022] According to a preferred embodiment, the conveying assembly comprises a conveying X-axis moving mechanism, a conveying Z-axis moving mechanism and a conveying suction cup, the moving end of the conveying X-axis moving mechanism can drive the conveying suction cup to move in the X-axis direction, and the moving end of the conveying Z-axis moving mechanism can drive the conveying suction cup to move in the Z-axis direction.

[0023] According to a preferred embodiment, the conveying assembly is provided with a discharging mechanism and a feeding mechanism on the left and right sides.

[0024] The discharging mechanism comprises a discharging conveyor belt, a discharging Z-axis moving mechanism, a discharging Y-axis moving mechanism and a discharging suction cup.

[0025] The feeding mechanism comprises a feeding conveyor belt, a feeding Z-axis moving mechanism, a feeding Y-axis moving mechanism and a feeding suction cup.

[0026] According to a preferred embodiment, the first pressing structure and the second pressing structure are both hollow frame structures.

[0027] A plurality of the first probes are arranged on the side of the first pressing structure away from the turntable.

[0028] A plurality of the second probes are arranged on the side of the second pressing structure close to the turntable.

[0029] A processing method of a laser-enhanced injection metallization strengthening and repair synchronous device, comprising the following steps:

[0030] Step S1: loading a battery with a voltage, a first double laser assembly emits a laser beam to irradiate a part of the surface of the battery, so as to promote the part of the surface of the battery to excite carriers to form a local high-density current;

[0031] Step S2: moving the battery to the working position of a second double laser assembly, the second double laser assembly emits a laser beam to irradiate another part of the surface of the battery, so as to promote the other part of the surface of the battery to excite carriers to form a local high-density current.

[0032] According to a preferred embodiment, in step S1, the carrying assembly places the battery on a turntable, controls the rotation of the turntable, rotates the turntable loaded with the battery to be directly below the first double laser assembly, controls the first lifting unit to promote the first pressing structure to press the battery, and the first double laser assembly emits a laser beam to irradiate a part of the surface of the battery.

[0033] In step S2, the rotation of the turntable is controlled, the turntable loaded with the battery is rotated to be directly below the second double laser assembly, and the second double laser assembly emits a laser beam to irradiate another part of the surface of the battery.

[0034] According to a preferred embodiment, the range of the loading voltage is 11V-17V.

[0035] The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0036] The process of the utility model has good efficiency improvement effect, can make more Ag-si combination more sufficient, has low resistance, low equipment cost, low related equipment and maintenance cost, sufficient instantaneous current of product processing, large processing width in the adding process, sufficient instantaneous current intensity in the whole width, sufficient sintering; the utility model can provide production stability, precision, gain and yield for the metallization strengthening and repair of batteries and assemblies. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the premise of the drawings.

[0038] Figure 1 A structure schematic view of a laser enhanced injection metallization strengthening and repair synchronous equipment provided by the embodiments of the present application is shown in the figure.

[0039] Figure 2 A structure schematic view of a first double laser assembly, a second double laser assembly and a rotary table provided by the embodiments of the present application is shown in the figure.

[0040] Figure 3 A front view of Figure 2 is shown in the figure.

[0041] Figure 4 A structure schematic view of a first pressing structure provided by the embodiments of the present application is shown in the figure.

[0042] Figure 5 A working state structure schematic view of a rotary table provided by the embodiments of the present application is shown in the figure.

[0043] Figure legend: 1, first laser output head; 2, first lifting unit; 3, first pressing structure; 4, first probe; 5, second laser output head; 6, second lifting unit; 7, second pressing structure; 8, second probe; 9, rotary table; 10, turntable; 11, copper plate fixture; 12, carrying X-axis moving mechanism; 13, carrying Z-axis moving mechanism; 14, carrying suction cup; 15, blanking mechanism; 16, feeding mechanism; 17, visual module. DETAILED DESCRIPTION

[0044] In order to better understand and implement, the technical scheme in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application.

[0045] In the description of the present application, it should be pointed out that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application that the indicated devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0047] Embodiments

[0048] Please refer to Figures 1 to 5 A laser enhanced injection metallization strengthening and repair synchronous device, comprising: a first double laser assembly, the first double laser assembly comprising at least two first laser output heads 1 and a first pressure monitoring mechanism, the first pressure monitoring mechanism comprising a first lifting unit 2 and a first pressure bonding structure 3 provided with a plurality of first probes 4, the lifting end of the first lifting unit 2 driving the first pressure bonding structure 3 to rise and fall; a second double laser assembly, the second double laser assembly comprising at least two second laser output heads 5 and a second pressure monitoring mechanism, the second pressure monitoring mechanism comprising a second lifting unit 6 and a second pressure bonding structure 7 provided with a plurality of second probes 8, the lifting end of the second lifting unit 6 driving the second pressure bonding structure 7 to rise and fall; a turntable 9, the turntable 9 being provided with a second voltage loading end and a plurality of turntables 10 for placing batteries, the first double laser assembly being located above one of the turntables 10, and the second double laser assembly being located above another of the turntables 10.

[0049] Preferably, the turntable 10 is provided with a copper plate jig 11.

[0050] Preferably, one side of the turntable 9 is provided with a carrying assembly;

[0051] The number of the turntables 10 comprises at least three;

[0052] The first turntable 10 is located below the first double laser assembly;

[0053] The second turntable 10 is located below the second double laser assembly;

[0054] The third turntable 10 is located below the carrying assembly.

[0055] Preferably, the device further comprises a vision module 17 located below the third turntable 10;

[0056] The number of the turntables 10 comprises at least four;

[0057] The fourth turntable 10 is located below the vision module 17.

[0058] Preferably, the carrying assembly comprises a carrying X-axis moving mechanism 12, a carrying Z-axis moving mechanism 13 and a carrying suction cup 14, the moving end of the carrying X-axis moving mechanism 12 being capable of driving the carrying suction cup 14 to move in the X-axis direction, and the moving end of the carrying Z-axis moving mechanism 13 being capable of driving the carrying suction cup 14 to move in the Z-axis direction.

[0059] Preferably, the left and right sides of the carrying assembly are provided with a discharging mechanism 15 and a feeding mechanism 16;

[0060] The discharging mechanism 15 comprises a discharging conveying belt, a discharging Z-axis moving mechanism, a discharging Y-axis moving mechanism and a discharging suction disc.

[0061] The feeding mechanism 16 comprises a feeding conveying belt, a feeding Z-axis moving mechanism, a feeding Y-axis moving mechanism and a feeding suction disc.

[0062] Preferably, the first pressing structure 3 and the second pressing structure 7 are both hollow frame structures.

[0063] The first probes 4 are arranged on the side of the first pressing structure 3 away from the turntable 9.

[0064] The second probes 8 are arranged on the side of the second pressing structure 7 close to the turntable 9.

[0065] A processing method of a laser-enhanced injection metallization strengthening and repair synchronous device, comprising the following steps: step S1: loading a voltage to a battery, a first double laser assembly emits a laser beam to irradiate a part of the surface of the battery, so as to promote the part of the surface of the battery to excite carriers to form a local high-density current;

[0066] Step S2: moving the battery to the working position of a second double laser assembly, the second double laser assembly emits a laser beam to irradiate another part of the surface of the battery, so as to promote the other part of the surface of the battery to excite carriers to form a local high-density current.

[0067] Preferably, in step S1, the carrying assembly places the battery on the turntable 10, the turntable 9 is controlled to rotate, the turntable 10 loaded with the battery is rotated to be directly below the first double laser assembly, the first lifting unit 2 is controlled to promote the first pressing structure 3 to press the battery tightly, and the first double laser assembly emits a laser beam to irradiate a part of the surface of the battery.

[0068] In step S2, the turntable 9 is controlled to rotate, the turntable 10 loaded with the battery is rotated to be directly below the second double laser assembly, and the second double laser assembly emits a laser beam to irradiate another part of the surface of the battery.

[0069] According to a preferred embodiment, the range of the loaded voltage is 11V-17V.

[0070] The working principle of the utility model:

[0071] In this embodiment, the electrochemical effect is as follows: the laser beam irradiates the battery surface, and the laser carriers (electrons) are injected to compensate for the lack of electrons on the surface, promoting the reduction of Ag+ to silver microcrystals. The thermal effect is as follows: under the guidance of bias voltage, photogenerated carriers form a local high-density current, generating heat to promote local Ag-Si interdiffusion, forming an AgSi-ix alloyed contact with extremely low resistance. Both the first and second dual-laser components are selected to use laser temperature measurement and are coaxially set. They are processed through a coaxial temperature control system, which facilitates precise thermal management, improves the metallurgical bonding quality, and allows for real-time temperature feedback: an infrared temperature measurement module (response time ≤200ns) is integrated into the coaxial optical system to directly monitor the surface temperature of the silicon wafer in the laser-affected area (range: 100-2500℃). Combined with a PID algorithm, the laser power and reverse voltage are dynamically adjusted to avoid over-burning (excessive ablation) or under-burning (failure to form good crystals) problems due to insufficient processing temperature. In the gradient temperature control process, temperature curves are preset for different processing areas within the area. For example, during the initial processing of the perimeter and center, the temperature is rapidly increased to 10% above the material modification point (normal power + 10%), and then reduced to normal power to maintain a stable processing effect and ensure sufficient metallurgical bonding at the interface. In this embodiment, the heat-affected zone (HAZ) and residual stress can be reduced, and precise temperature control can be achieved by localizing the temperature: through a confinement layer (such as an argon curtain) in conjunction with the temperature control system, heat is concentrated on the surface layer (HAZ depth ≤ 100 μm), ensuring coarsening of the silicon substrate material grains, which is especially suitable for screen-printed batteries. Synchronous cooling: after completing the processing of the corresponding area, the next area is processed, and the processed area is rapidly cooled (cooling rate up to 300℃ / ms) to suppress the precipitation of brittle phases and improve battery characteristics.

[0072] In this embodiment, the first dual-laser assembly is provided with two first laser output heads 1, and the second dual-laser assembly is provided with two second laser output heads 5, such as... Figure 5As shown, a battery on the turntable 10 can be divided into four regions: A, B, C, and D. Several first probes 4 of the first pressing structure 3 can be driven to rise and fall by the first lifting unit 2, so that several first probes 4 contact the battery. At the same time, the copper plate fixture 11 contacts the battery, realizing the electrical connection between the two poles of the battery. The copper plate fixture 11 on the turntable 10 can be connected to an external electrical connection terminal, which is located at the bottom of the turntable 9. In this embodiment, in addition to the copper plate fixture 11, other connecting elements can be selected so that the battery on the turntable 10 can be connected to two electrical connection terminals respectively, so that voltage can be applied to the battery. After the voltage is applied, the battery is then laser-processed. After the A and B regions of the battery are laser-irradiated and processed, the turntable 9 rotates, and the battery rotates from position E to position F. At this time, the two second laser output heads 5 perform laser processing on the C and D regions of the battery, completing the laser processing of the same battery after applying voltage. In this embodiment, the processed circular, rectangular, and stripe light spots can be customized according to application needs. The smallest light spot is 20µm, and the largest rectangular light spot can reach 230*1.2mm. The vision module 17 can be composed of four cameras, each connected to an attached camera. Figure 5 The four regions A, B, C, and D correspond one-to-one, allowing for the detection and monitoring of each region of the battery.

[0073] In this embodiment, both the first laser output head 1 and the second laser output head 5 adopt an infrared continuous laser scheme, with the main wavelength range of 750-1400nm. They can also be compatible with green laser schemes, with a wavelength range of 500-570nm, and are also compatible with ultraviolet lasers. This device is compatible with pulsed or continuous lasers, and also with laser beam splitting schemes. The laser has a power feedback function and can also be used for laser processing of modules. It can be used for string bonding processes of PERC, TOPCON, HJT, and XBC modules. The process scheme is not limited to laser welding, laser removal, laser cutting, laser scribing, etc. Furthermore, in this embodiment, a dual-path power negative feedback system can be selected to detect the output and feed it back to the first dual-laser module and the second dual-laser module for power regulation.

[0074] In this embodiment, the first dual-laser component and the second dual-laser component achieve strengthening and repair through laser-enhanced metallization. Because high power density can provide higher energy per unit area, higher energy per unit area can quickly promote the strengthening effect of the electrode. At the same time, high energy can cause the silver electrode layer to penetrate through the dielectric layer to reach the silicon substrate, forming a silver-silicon bonding layer. The higher the laser energy, the stronger the mutual penetration of silver and silicon. Under a certain unit energy, the mutual penetration of silver and silicon can be enhanced to form a metallurgical bonding layer interface of a certain depth. The enhanced process can repair the metallurgical interface layer of the battery. A battery can be processed in four regions, allowing for simultaneous processing of two regions at a time or step-by-step processing. While simultaneously processing two regions (e.g., A and B), the interface layer of the other two regions (e.g., C and D) can be repaired more precisely. During asynchronous processing, the laser irradiates the battery, generating current near the grid lines inside the battery. This current converges near the grid lines to create charge carriers, which then refine and optimize defects at the interface, reducing the resistance of the interface layer and making it more uniform, complete, and stable.

[0075] This embodiment is compatible with lasers with power ranging from 10 to 1000W, and can more accurately control the power to 0.1W. It can also enable multiple lasers to emit light together, and can simultaneously control multiple low-power lasers. A single battery can simultaneously achieve a reverse voltage of 1-30V, which can be accurately controlled to 0.1V. It can also enable a single power supply to divide the voltage and supply voltage to each battery individually. This solution allows for simultaneous processing in four regions, and is not limited to four beam splits and four reverse voltage applications.

[0076] This embodiment can be used to simultaneously achieve laser-enhanced injection metallization strengthening and repair of photovoltaic crystalline silicon cells (TOPCON / HJT / XBC), and can also be used for laser-enhanced injection metallization strengthening and repair in new processes such as stacked grid and half-cell passivation cells. This equipment significantly improves the gain efficiency of photovoltaic crystalline silicon cells, increasing the gain by 0.2-0.3% while ensuring the overall product yield and stability.

[0077] Both the first pressing structure 3 and the second pressing structure 7 are hollow frame structures and are adapted to the shape and size of the battery. Therefore, after the first pressing structure 3 and the second pressing structure 7 are raised and lowered, they can fit and press the battery. The first probe 4 or the second probe 8 can make electrical signal contact connection to the corresponding battery.

[0078] The transport components are attached. Figure 1As shown, the Z-axis and Y-axis unloading mechanisms enable the unloading suction cup to move along the Z and Y axes, respectively. The moving end of the Y-axis unloading mechanism can be connected to the unloading suction cup, in which case the moving end of the Z-axis unloading mechanism is connected to the Y-axis unloading mechanism. When the moving end of the Z-axis unloading mechanism is connected to the unloading suction cup, the moving end of the Y-axis unloading mechanism can drive the Z-axis unloading mechanism. Additionally, an X-axis unloading mechanism can be provided to allow the unloading suction cup to move along the X-axis. Similarly, the loading mechanism 16 of the conveying assembly has the same structure as the unloading mechanism 15, and therefore will not be described further.

[0079] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A laser-enhanced injection metallization strengthening and repair synchronous device, characterized in that, include: The first dual-laser assembly includes at least two first laser output heads and a first pressure monitoring mechanism. The first pressure monitoring mechanism includes a first lifting unit and a first pressing structure with a plurality of first probes. The lifting end of the first lifting unit drives the first pressing structure to move up and down. The second dual-laser assembly includes at least two second laser output heads and a second pressure monitoring mechanism. The second pressure monitoring mechanism includes a second lifting unit and a second pressing structure with a plurality of second probes. The lifting end of the second lifting unit drives the second pressing structure to move up and down. The turntable is provided with a second voltage loading terminal and a plurality of turntables for placing batteries. The first dual-laser assembly is located above one of the turntables, and the second dual-laser assembly is located above the other turntable.

2. The laser-enhanced injection metallization strengthening and repair synchronous device according to claim 1, characterized in that, The turntable is equipped with a copper plate fixture.

3. The laser-enhanced injection metallization strengthening and repair synchronous device according to claim 1, characterized in that, A conveying assembly is provided on one side of the turntable; The number of turntables includes at least three; The first turntable is located below the first dual-laser assembly; The second turntable is located below the second dual-laser assembly; The third turntable is located below the transport assembly.

4. The laser-enhanced injection metallization strengthening and repair synchronous device according to claim 3, characterized in that, It also includes the visual module; The number of turntables includes at least four; The fourth turntable is located below the visual module.

5. The laser-enhanced injection metallization strengthening and repair synchronous device according to claim 3, characterized in that, The transport assembly includes a transport X-axis moving mechanism, a transport Z-axis moving mechanism, and a transport suction cup. The moving end of the transport X-axis moving mechanism can drive the transport suction cup to move in the X-axis direction, and the moving end of the transport Z-axis moving mechanism can drive the transport suction cup to move in the Z-axis direction.

6. The laser-enhanced injection metallization strengthening and repair synchronous device according to claim 5, characterized in that, The conveying assembly is provided with a feeding mechanism and a loading mechanism on its left and right sides; The feeding mechanism includes a feeding conveyor belt, a feeding Z-axis moving mechanism, a feeding Y-axis moving mechanism, and a feeding suction cup; The feeding mechanism includes a feeding conveyor belt, a feeding Z-axis moving mechanism, a feeding Y-axis moving mechanism, and a feeding suction cup.

7. The laser-enhanced injection metallization strengthening and repair synchronous device according to claim 5, characterized in that, Both the first pressing structure and the second pressing structure are hollow frame structures; Several of the first probes are disposed on the side of the first pressing structure away from the turntable; Several second probes are disposed on one side of the second pressing structure near the turntable.

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