A solar cell light injection device and method thereof

Abstract

This invention relates to the field of solar cells, specifically to a solar cell light injection device and method. It includes a frame with an input device at one end and an output device at the other. A stepping conveyor is positioned between the input and output devices for transmission. A constant-temperature chamber is located on top of the stepping conveyor, and a preheating zone, a light injection zone, and a cooling zone are sequentially arranged within the chamber. By using a stepping conveyor, when the solar cell is processed in the light injection zone, the stepping conveyor descends, and the steel strip is positioned in the narrow groove of the constant-temperature platform, avoiding contact with the solar cells adsorbed on the platform. This ensures that the heat transfer efficiency of the solar cell is not affected during transmission, guaranteeing temperature control of the solar cell.

Description

Technical Field

[0001] The invention relates to the field of solar cells, and in particular to a solar cell light injection device and a method thereof. Background Art

[0002] Light-induced degradation (LID) refers to the power attenuation phenomenon caused by solar cells and modules during illumination. It is generally believed that the main reason for the light-induced degradation of P-type (boron-doped) solar cells is that when boron and oxygen must coexist in silicon materials, light or current injection causes boron and oxygen to form a boron-oxygen (BO) complex. The boron-oxygen complex is a metastable defect that forms a recombination center, thereby reducing the minority carrier lifetime.

[0003] In the prior art, the industry has developed a series of solutions to the causes of light-induced degradation, such as reducing the oxygen content in silicon wafers, using gallium to replace part of the boron element, and reducing the boron content to reduce light-induced degradation. However, these methods are costly or technically difficult and cannot be mass-produced. Among them, the method of introducing hydrogen atoms into the dielectric passivation film through light injection or electrical injection can also promote the failure of the BO complex, which is a better method.

[0004] Therefore, a light injection device with high light intensity, controllable temperature, pre-attenuation of light on solar cells and significant resistance to photo-induced degradation is developed. Summary of the invention

[0005] In view of the problems mentioned in the prior art, the light injection device and method of solar cells of the present invention make the solar cells significantly resistant to light-induced degradation and have good compatibility. At the same time, the method is simple, the temperature control accuracy is high, and it is suitable for industrial applications.

[0006] The present invention provides a solar cell light injection device, comprising a frame, wherein an input device is provided at one end of the frame, an output device is provided at the other end, a stepping conveyor device for transmission is provided between the input device and the output device, a constant temperature box is provided on the top of the stepping conveyor device, and a preheating zone, a light injection zone and a cooling zone are sequentially provided in the constant temperature box.

[0007] Preferably, the stepping conveying device includes a linear guide rail, a lifting guide rail, a first bracket, a second bracket, a steel belt, a first servo motor and a second servo motor. The multiple linear guide rails are arranged parallel to each other on the frame. The linear guide rail is provided with a first bracket. One end of the linear guide rail is also provided with a first servo motor and a ball screw single-axis manipulator for moving the first bracket along the linear guide rail; the first bracket is provided with a plurality of lifting guide rails, and the second bracket is installed on the lifting guide rail. Multiple groups of steel belts are evenly arranged on the second bracket, and one end of the lifting guide rail is also provided with a second servo motor and an electric cylinder for lifting the second bracket along the lifting guide rail.

[0008] Preferably, a constant temperature platform is also provided in the constant temperature box, and the height of the constant temperature platform is between the first bracket and the second bracket. A plurality of fine grooves are provided on the constant temperature platform, and the size of the fine grooves is adapted to the size of the steel belt. A plurality of adsorption holes are also provided on the constant temperature platform, and the adsorption holes are connected to the vacuum system provided outside the constant temperature box through a vacuum pipeline.

[0009] Preferably, the preheating zone includes a plurality of electric heating tubes located inside the constant temperature platform, and the preheating zone can quickly heat the solar cells to a preheating temperature of 100°C to 250°C.

[0010] Preferably, there are multiple workstations in the light injection area, the light injection area includes a temperature control air duct and multiple LED light modules, the temperature control air duct is arranged at the bottom of the constant temperature platform, the temperature control air duct includes an air inlet and an air outlet, a first cross-flow fan is installed at the air inlet, the air outlet is connected to multiple heat exhaust outlets outside the constant temperature box, and a fin heat sink is also provided in the temperature control air duct.

[0011] Preferably, the LED lighting module is arranged on the top of the constant temperature platform, and the LED lighting module includes a frame, an LED chip, a water cooling system and an air cooling system. The frame is provided with heat-resistant glass, and the LED chip is installed on the top of the heat-resistant glass, and the LED chip is connected to the water cooling system and the air cooling system respectively; the LED chip is aligned with the solar cell on the constant temperature platform, and the light intensity range of the LED chip is 10KW / m 2 ~100 KW / m 2 The light injection time is between 10s and 1000s.

[0012] Preferably, the temperature control air duct and multiple LED light modules in the light injection zone are controlled by separate independent control systems, and when the light intensity of the LED chip is 60KW / m 2 When the temperature of the solar cell can be controlled between 150℃ and 300℃.

[0013] Preferably, the cooling zone includes a cooling fan arranged on the constant temperature platform, and the cooling fan is aligned with the constant temperature platform.

[0014] Preferably, the input device and the output device both include a belt conveyor and a single-axis manipulator, and the single-axis manipulator is installed on the top of the belt conveyor.

[0015] A method for injecting light into a solar cell device comprises the following steps:

[0016] (1) When the first group of solar cells passes through the input device, it is placed on the steel belt in the stepping conveyor;

[0017] (2) The second bracket is driven to rise to the highest point along the lifting guide rail by the electric cylinder and the second servo motor, and then the first bracket is driven to move forward along the length direction of the linear guide rail by the first servo motor;

[0018] (3) When advancing to the preheating zone, the second bracket is controlled to descend along the lifting rail so that its steel belt descends into the fine groove on the constant temperature platform. At the same time, the first group of solar cells on the steel belt will fall onto the constant temperature platform and be positioned by vacuum adsorption through the provided adsorption holes, and the solar cells will be preheated;

[0019] (4) Then, the first bracket and the second bracket are reset, and the second group of solar cells are placed on the steel belt through the input device, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor lifts the first group of solar cells and conveys the preheated first group of solar cells to the light injection area for light injection, while the second group of solar cells is simultaneously conveyed by the stepping conveyor to the preheating area for preheating;

[0020] (5) Then, the first bracket and the second bracket are reset, and the third group of solar cells are placed on the steel belt through the input device, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor lifts up the first group of solar cells, and transfers the first group of solar cells after light injection to the cooling area for cooling. At the same time, the second group of solar cells is lifted up, and the second group of solar cells enters the light injection area from the preheating area for light injection, and at the same time, the third group of solar cells is transferred to the preheating area for preheating;

[0021] (6) Then, the first bracket and the second bracket are reset, and the fourth group of solar cells is placed on the steel belt through the input device, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor device lifts up the first group of solar cells, and the first group of solar cells after cooling are collected through the output device, completing the entire light injection operation process of the first group of solar cells; at the same time, the second group of solar cells is lifted up, and the second group of solar cells enters the cooling area from the light injection area for operation.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] The present invention provides a stepping transmission device. When the solar cell is processed in the light injection area, the stepping transmission mechanism is in a descending state, and the steel belt is located in the fine groove of the constant temperature platform and does not contact the solar cell adsorbed on the constant temperature platform. The heat transfer efficiency of the solar cell is not affected during the transmission process, thereby ensuring the temperature control of the solar cell.

[0024] The present invention can effectively ensure the temperature uniformity of the constant temperature platform by setting a fin heat sink in the high heat capacity constant temperature platform and assisting with a separately controlled electric heating tube. At the same time, when performing light injection operation, the solar cell is completely adsorbed on the constant temperature platform, which effectively ensures the temperature control accuracy of the solar cell.

[0025] The first cross-flow fan provided in the present invention can provide equal air volume to flow through the heat dissipation surface, effectively ensuring the heat dissipation consistency of the radiator along the wind direction. The air volume of the first cross-flow fan can be linearly adjusted as the output light energy of the LED chip changes, ensuring that the temperature control accuracy of the solar cell can be effectively guaranteed under different output light energy conditions.

[0026] The present invention adopts an integral frame type LED lighting module, and through the provision of a water cooling system and an air cooling system, the two cooling methods effectively ensure the life of the LED chip in a high temperature environment when light is injected. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the front structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention.

[0029] Figure 3 It is a schematic diagram of the stepping transmission device and the light injection area of ​​the present invention.

[0030] Figure markings: 1-frame; 11-constant temperature box; 12-heat outlet; 13-main water inlet pipeline; 14-main water return pipeline; 15-LED power supply; 2-input device; 21-belt conveyor; 22-single-axis manipulator; 3-preheating zone; 4-light injection zone; 41-constant temperature platform; 42-fin heat sink; 43-first cross-flow fan; 5-cooling zone; 51-cooling fan; 6-output device; 7-stepping conveyor; 71-linear guide rail; 72-second bracket; 73-steel belt; 74-first servo motor; 75-ball screw single-axis manipulator; 76-lifting guide rail; 77-second servo motor; 78-electric cylinder; 8-LED lighting module; 81-water cooling plate; 82-LED chip; 83-heat-resistant glass; 84-second cross-flow fan. DETAILED DESCRIPTION Example

[0031] The present invention provides a solar cell light injection device, such as Figure 1 and Figure 2 As shown, it includes a frame 1, one end of which is provided with an input device 2, and the other end of which is provided with an output device 6, a stepping conveyor 7 for transmission is provided between the input device 2 and the output device 6, and a constant temperature box 11 is provided on the top of the stepping conveyor 7, and a preheating area 3, a light injection area 4 and a cooling area 5 are sequentially provided in the constant temperature box 11. The solar cell light injection device in this embodiment can process solar cells with a size of 156mmX156mm to 210mmX210mm, and the insulation box is made of a steel structure frame and insulation material, and the thickness of the insulation material is not less than 50mm.

[0032] The stepping conveyor 7 includes a linear guide rail 71, a lifting guide rail 76, a first bracket, a second bracket 72, a steel belt 73, a first servo motor 74 and a second servo motor 77. The plurality of linear guide rails 71 are arranged parallel to each other on the frame 1. The linear guide rail 71 is provided with a first bracket. One end of the linear guide rail 71 is also provided with a first servo motor 74 and a ball screw single-axis manipulator 7522 for moving the first bracket along the linear guide rail 71; the first bracket is provided with a plurality of lifting guide rails 76, the second bracket 72 is installed on the lifting guide rail 76, and a plurality of groups of steel belts 73 are evenly arranged on the second bracket 72. One end of the lifting guide rail 76 is also provided with a second servo motor 77 and an electric cylinder 78 for lifting and lowering the second bracket 72 along the lifting guide rail 76. In this embodiment, the conveying cycle of the stepping conveyor 7 is no more than 2S, and the entire operation process is that the second bracket 72 rises along the lifting guide rail 76 - the first bracket moves forward along the linear guide rail 71 - the second bracket 72 descends along the lifting guide rail 76 - the first bracket retreats along the linear guide rail 71. The entire operation process forms a rectangular shape. In this embodiment, there are 12 steel belts 73, 4 lifting guide rails 76, and 4 linear guide rails 71.

[0033] The constant temperature box 11 is also provided with a constant temperature platform 41, the height of which is between the first bracket and the second bracket 72, and the constant temperature platform 41 is provided with a plurality of fine grooves, the size of which is adapted to the size of the steel belt 73, and the constant temperature platform 41 is also provided with a plurality of adsorption holes, which are connected to the vacuum system provided outside the constant temperature box 11 through a vacuum pipeline. The vacuum system of this embodiment is a commonly used existing technology, and the vacuum pipeline is made of a stainless steel pipe that can withstand 300°C. The vacuum system can adsorb and position the solar cell through the provided adsorption holes to ensure smooth completion of the operation; the number and size of the provided fine grooves match the number and size of the steel belt 73, and the fine grooves are used for the steel belt 73 during the transportation process to ensure that the heat transfer efficiency during the solar power operation is not affected. The preheating zone 3 includes a plurality of electric heating tubes located inside the constant temperature platform 41, and the preheating zone 3 can quickly heat the solar cell to the preheating temperature, which is 100°C to 250°C.

[0034] There are multiple workstations in the light injection area 4. The light injection area 4 includes a temperature control air duct and multiple LED light modules 8. The temperature control air duct is arranged at the bottom of the constant temperature platform 41. The temperature control air duct includes an air inlet and an air outlet. A first cross-flow fan 43 is installed at the air inlet. The air outlet is connected to multiple heat outlets 12 outside the constant temperature box 11, and a fin heat sink 42 is also arranged in the temperature control air duct. In this embodiment, the air inlet and the air outlet are both provided with an openable and closable damper. In order to prevent the temperature of the temperature control air duct from being too high, the air inlet and the air outlet can be opened, and the heat is dissipated by the first cross-flow fan 43, the fin heat sink 42, and the heat outlet 12, so as to ensure that the temperature control accuracy is between ±1°C; the size of the fin heat sink 42 is adapted to the temperature control air duct, and the fin direction thereof extends from the air inlet to the air outlet. The workstations in the light injection area 4 can be provided with 1 to 8 workstations according to actual production.

[0035] The LED light module 8 is arranged on the top of the constant temperature platform 41. The LED light module 8 includes a frame, an LED chip 82, a water cooling system and an air cooling system. A heat-resistant glass 83 is arranged in the frame. The LED chip 82 is installed on the top of the heat-resistant glass 83, and the LED chip 82 is connected to the water cooling system and the air cooling system respectively. The LED chip 82 is arranged to align with the solar cell on the constant temperature platform 41. The light intensity range of the LED chip 82 is 10KW / m 2 ~100 KW / m 2 The light injection time is 10s to 1000s. In this embodiment, two water cooling systems and air cooling systems are used to control the temperature of the LED chip 82. The water cooling system consists of a water cooling plate 81, a water cooling pipeline and a temperature sensor. The water cooling plate 81 is connected to the copper circuit board of the LED chip 82, and thermal conductive silicone grease is applied between the two. The water inlet and the water return port of the water cooling plate 81 are connected in parallel to the main water inlet pipeline 13 and the main water return pipeline 14 set on the body through the water cooling pipeline. The LED chip 82 is cooled by the continuously circulating water. When the water cooling system is working normally, the water flow rate of the LED lighting module is 1m 3 / h, the return water temperature rises by 5°C, and the temperature of the LED chip 82 rises by 5°C; the air cooling system consists of a second cross-flow fan 64 installed at one end and an exhaust port at the other end, and its function is to cool the surface of the LED chip 82. The second cross-flow fan 64 is installed between the heat-resistant glass 83 and the LED chip 82 to cool the LED chip 82, and also includes an LED power supply 15, which is connected to the LED chip 82.

[0036] The temperature control air duct of the light injection zone 4 and the LED light module 8 are independently controlled by separate control systems, and when the light intensity of the LED chip 82 is 60KW / m 2 When the temperature of the solar cell can be controlled between 150°C and 300°C, the light intensity of the LED chip 82 in this embodiment is preferably 60KW / m2 , and then through the action of the temperature-controlled air duct, the temperature of the solar cell can be always maintained between 150℃ and 300℃, thus preventing the solar cell temperature from being too high.

[0037] The cooling zone 5 includes a cooling fan 51 disposed on the constant temperature platform 41, and the cooling fan 51 is aligned with the constant temperature platform 41. The cooling fan 51 can quickly cool the solar cell after the light injection process to room temperature.

[0038] The input device 2 and the output device 6 both include a belt conveyor 21 and a single-axis manipulator 22, and the single-axis manipulator 22 is installed on the top of the belt conveyor 21. The input device 2 in this embodiment is used to arrange the sintered solar cells into a row of multiple solar cells through multiple belt conveyors, and then the single-axis manipulator 22 sucks the arranged battery group onto the stepping conveyor 7; the output device 6 sucks the solar cells onto the belt conveyor after the single-axis manipulator 22 completes the light injection operation and then sends them out of the device.

[0039] An LED power supply 15 is also provided on the top of the input device 2 and the output device 6 , and the LED power supply 15 is connected to the LED chip 82 .

[0040] A method for injecting light into a solar cell device comprises the following steps:

[0041] (1) When the first group of solar cells passes through the input device 2, it is placed on the steel belt 73 in the stepping conveyor 7;

[0042] (2) The second bracket 72 is driven to rise to the highest point along the lifting guide rail 76 by the electric cylinder 78 and the second servo motor 77, and then the first bracket is driven to move forward along the length direction of the linear guide rail 71 by the first servo motor 74;

[0043] (3) When advancing to the preheating zone 3, the second bracket 72 is controlled to descend along the lifting guide rail 76, so that its steel belt 73 descends into the fine groove on the constant temperature platform 41, and at the same time, the first group of solar cells on the steel belt 73 will fall onto the constant temperature platform 41, and will be positioned by vacuum adsorption through the provided adsorption holes, and the solar cells will be preheated;

[0044] (4) Then, the first bracket and the second bracket 72 are reset, and the second group of solar cells are placed on the steel belt 73 through the input device 2, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor 7 lifts up the first group of solar cells and conveys the preheated first group of solar cells to the light injection area 4 for light injection, while the second group of solar cells is simultaneously conveyed by the stepping conveyor 7 to the preheating area 3 for preheating;

[0045] (5) Then, the first bracket and the second bracket 72 are reset, and the third group of solar cells are placed on the steel belt 73 through the input device 2, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor 7 lifts up the first group of solar cells, and transfers the first group of solar cells after light injection to the cooling zone 5 for cooling. At the same time, the second group of solar cells is lifted up, and the second group of solar cells enters the light injection zone 4 from the preheating zone 3 for light injection, and at the same time, the third group of solar cells is transferred to the preheating zone 3 for preheating.

[0046] (6) Then, the first bracket and the second bracket 72 are reset, and the fourth group of solar cells are placed on the steel belt 73 through the input device 2, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor 7 lifts up the first group of solar cells, and the first group of solar cells after cooling are collected through the output device 6, completing the entire light injection operation process of the first group of solar cells; at the same time, the second group of solar cells is lifted up, and the second group of solar cells enters the cooling area 5 from the light injection area 4 for operation.

Claims

1. A solar cell light injection device, characterized in that: It comprises a frame, one end of which is provided with an input device, the other end of which is provided with an output device, a stepping conveyor device for transmission is provided between the input device and the output device, a constant temperature box is provided on the top of the stepping conveyor device, and a preheating zone, a light injection zone and a cooling zone are provided in sequence in the constant temperature box; The stepping conveyor device includes a linear guide rail, a lifting guide rail, a first bracket, a second bracket, a steel belt, a first servo motor and a second servo motor. The plurality of linear guide rails are arranged parallel to each other on the frame. The linear guide rail is provided with a first bracket. One end of the linear guide rail is also provided with a first servo motor and a ball screw single-axis manipulator for the first bracket to move along the linear guide rail; the first bracket is provided with a plurality of lifting guide rails, the second bracket is installed on the lifting guide rail, and a plurality of groups of steel belts are evenly arranged on the second bracket. One end of the lifting guide rail is also provided with a second servo motor and an electric cylinder for the second bracket to move up and down along the lifting guide rail; The constant temperature box is also provided with a constant temperature platform, the height of which is between the first bracket and the second bracket, and the constant temperature platform is provided with a plurality of fine grooves, the size of which is adapted to the size of the steel belt, and the constant temperature platform is also provided with a plurality of adsorption holes, which are connected to the vacuum system provided outside the constant temperature box through a vacuum pipeline; The preheating zone includes a plurality of electric heating tubes located inside the constant temperature platform, and the preheating zone can quickly heat the solar cells to a preheating temperature of 100°C to 250°C; There are multiple workstations in the light injection area, and the light injection area includes a temperature control air duct and multiple LED light modules. The temperature control air duct is arranged at the bottom of the constant temperature platform. The temperature control air duct includes an air inlet and an air outlet. A first cross-flow fan is installed at the air inlet, and the air outlet is connected to multiple heat exhaust outlets outside the constant temperature box. A fin heat sink is also provided in the temperature control air duct.

2. A solar cell light injection device according to claim 1, characterized in that: The LED lighting module is arranged on the top of the constant temperature platform. The LED lighting module includes a frame, an LED chip, a water cooling system and an air cooling system. The frame is provided with heat-resistant glass, and the LED chip is installed on the top of the heat-resistant glass. The LED chip is connected to the water cooling system and the air cooling system respectively. The LED chip is aligned with the solar cell on the constant temperature platform, and the light intensity range of the LED chip is 10KW / m 2 ~100 KW / m 2 The light injection time is between 10s and 1000s.

3. A solar cell light injection device according to claim 2, characterized in that: The temperature control air duct and multiple LED light modules in the light injection area are controlled by separate independent control systems, and when the light intensity of the LED chip is 60KW / m 2 When the temperature of the solar cell can be controlled between 150℃ and 300℃.

4. A solar cell light injection device according to claim 3, characterized in that: The cooling zone includes a cooling fan arranged on the constant temperature platform, and the cooling fan is arranged to be aligned with the constant temperature platform.

5. A solar cell light injection device according to claim 4, characterized in that: The input device and the output device both include a belt conveyor and a single-axis manipulator, and the single-axis manipulator is installed on the top of the belt conveyor.

6. A light injection method for a solar cell light injection device according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) When the first group of solar cells passes through the input device, it is placed on the steel belt in the stepping conveyor; (2) The second bracket is driven to rise to the highest point along the lifting guide rail by the electric cylinder and the second servo motor, and then the first bracket is driven to move forward along the length direction of the linear guide rail by the first servo motor; (3) When advancing to the preheating zone, the second bracket is controlled to descend along the lifting rail so that its steel belt descends into the fine groove on the constant temperature platform. At the same time, the first group of solar cells on the steel belt will fall onto the constant temperature platform and be positioned by vacuum adsorption through the provided adsorption holes, and the solar cells will be preheated; (4) Then, the first bracket and the second bracket are reset, and the second group of solar cells are placed on the steel belt through the input device, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor lifts the first group of solar cells and conveys the preheated first group of solar cells to the light injection area for light injection, while the second group of solar cells is simultaneously conveyed by the stepping conveyor to the preheating area for preheating; (5) Then, the first bracket and the second bracket are reset, and the third group of solar cells are placed on the steel belt through the input device, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor lifts up the first group of solar cells, and transfers the first group of solar cells after light injection to the cooling area for cooling. At the same time, the second group of solar cells is lifted up, and the second group of solar cells enters the light injection area from the preheating area for light injection, and at the same time, the third group of solar cells is transferred to the preheating area for preheating; (6) Then, the first bracket and the second bracket are reset, and the fourth group of solar cells is placed on the steel belt through the input device, and the above steps (2) and (3) are repeated. At this time, the stepping conveyor device lifts up the first group of solar cells, and the first group of solar cells after cooling are collected through the output device, completing the entire light injection operation process of the first group of solar cells; At the same time, the second group of solar cells is lifted up, and the second group of solar cells moves from the light injection area to the cooling area for operation.

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