Battery piece sintering and light injection integrated device and use method

Abstract

The application discloses a battery piece sintering and light injection integrated equipment and a use method, relates to the technical field of solar battery piece production, and discloses a battery piece sintering and light injection integrated equipment, which comprises a sintering and light injection integrated furnace, an integrated furnace base, a sintering bin and a light injection bin, battery pieces are sequentially subjected to heating sintering in the sintering bin, and then enter the light injection bin to be subjected to light injection; and an exhaust system is used for exhausting waste gas in the battery piece sintering process. The application is characterized in that two transmission mesh belts for alternately receiving materials are arranged in the furnace, so that a single equipment can be used for multi-line production, an additional production line does not need to be additionally arranged, production capacity can be improved at a low cost, in addition, the battery pieces can reciprocally move while being directionally transmitted on the transmission mesh belts, uniform heating is ensured, the yield is improved, the effect of turbulence is generated, impurity distribution in waste gas in the furnace is more uniform, impurities can be quickly exhausted, and the production quality of the battery pieces is improved.

Description

Technical Field

[0001] This invention relates to the field of solar cell manufacturing technology, and in particular to an integrated equipment for solar cell sintering and light injection, and its usage method. Background Technology

[0002] In the field of solar cells, improving the photoelectric conversion efficiency of silicon solar cells is of greater significance for reducing the manufacturing cost of solar cells. Solar cells generally consist of silicon wafers, which can be divided into monocrystalline silicon wafers, polycrystalline silicon wafers, and cast monocrystalline silicon wafers. A passivation layer and an aluminum back surface are formed sequentially on one side of the silicon wafer, while an emitter is formed on the other side of the silicon wafer. An anti-reflection film and grid lines are distributed on the emitter.

[0003] In the manufacturing process of solar cells, solar cells with the above structure need to undergo a sintering process, in which the metal paste in the solar cell is fused with the silicon wafer surface at high temperature to form an alloy layer, thereby enabling the solar cell device to conduct electricity.

[0004] The so-called sintering process is to make the electrode and the silicon wafer itself form an ohmic contact. The principle is that when the metal material and semiconductor single crystal silicon in the electrode are heated to the eutectic temperature, the single crystal silicon atoms are incorporated into the molten alloy electrode material in a certain proportion. The whole process of the single crystal silicon atoms being incorporated into the electrode metal generally only takes a few seconds.

[0005] Currently, in addition to sintering, another crucial process in the processing of silver-paste-printed solar cells is optical injection. Optical injection involves injecting a laser or fiber optic beam into the interior of a semiconductor material through the PN junction, thereby significantly altering the carrier concentration and distribution state of the semiconductor and rapidly enhancing its electrical properties.

[0006] A patent with authorization announcement number CN216818361U discloses a sintering and light-injection integrated machine for solar cells, which includes at least one furnace body arranged along the conveying direction of the solar cells. The working area inside the furnace body includes a drying zone, a sintering zone, a multi-functional zone, a light-injection zone, and a cooling zone arranged sequentially. A transmission device is used to input the solar cells and transport them sequentially through the various working zones inside the furnace body before outputting them out of the furnace body. The multi-functional zone includes a cooling section and a heating section, or one of both, arranged sequentially along the conveying direction of the solar cells. This utility model's sintering and light-injection integrated machine for solar cells integrates the drying zone, sintering zone, multi-functional zone, light-injection zone, and cooling zone into one unit, greatly improving the processing efficiency of the solar cells. In addition, by setting up the multi-functional zone, rapid annealing of the solar cells through rapid cooling and rapid heating can be achieved. Subsequently, the annealed solar cells are passivated in the light-injection zone, which can improve the electrical performance of the solar cells.

[0007] In the aforementioned patent documents, the solar cells are transported in a single-line directional manner within the furnace. This means that each piece of equipment can only produce on a single line, which severely limits production capacity. To increase production capacity, the only solution is to add an entire production line, which greatly increases production costs. Furthermore, the single-line directional transport method makes the solar cells prone to uneven heating in certain areas, leading to bulging, and in severe cases, aluminum beads, reducing the yield of the solar cells. Moreover, if the transport device malfunctions, it can only be shut down for maintenance, affecting production capacity and potentially causing significant economic losses to the company.

[0008] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide an integrated equipment for sintering and photoinjection of solar cells and a method for using it. Summary of the Invention

[0009] The purpose of this invention is to provide an integrated equipment and method for sintering and photoinjection of solar cells, which can solve the problems of limited production capacity, low yield, and need for downtime maintenance after failure.

[0010] To achieve the above objectives, embodiments of the present invention provide an integrated solar cell sintering and photoinjection apparatus, comprising:

[0011] The sintering-light-injection integrated furnace includes an integrated base, a sintering chamber and a light-injection chamber. The solar cells are heated and sintered and cooled sequentially inside the sintering chamber before entering the light-injection chamber for light injection.

[0012] The exhaust system is used to remove waste gas from the sintering process of the battery cells;

[0013] A wafer guide is used to supply the solar cells to be sintered to the equipment.

[0014] The feeding mechanism includes a main frame, a first mesh belt and a second mesh belt. Both the first mesh belt and the second mesh belt are mounted on the main frame. The main frame can reciprocate so that the first mesh belt and the second mesh belt can alternately receive the solar cells to be sintered on the wafer guide machine, thereby simultaneously sintering and light-injecting the solar cells on the two mesh belts.

[0015] The drive guide mechanism is used to drive the feeding mechanism to move horizontally and reciprocally.

[0016] In one or more embodiments of the present invention, the sintering chamber includes a sintering zone and a cooling zone. The sintering zone includes three heating chambers with different temperatures arranged sequentially. The battery cells are cooled in the cooling zone by a combination of air cooling and water cooling.

[0017] In one or more embodiments of the present invention, the light injection chamber includes a light injection area, which includes three chambers arranged sequentially: a heating chamber, a heat preservation chamber, and a light irradiation chamber.

[0018] In one or more embodiments of the present invention, a heat compensation system is installed on the sintering chamber. The heat compensation system can recover the heat in the exhaust gas discharged from the exhaust system and can use the heat to compensate for the heating chambers with different temperatures in the three heating chambers in the sintering zone or the heating chamber in the light injection zone.

[0019] In one or more embodiments of the present invention, a plurality of spoilers are fixedly connected to the main frame, and the spoilers are arranged at an angle.

[0020] In one or more embodiments of the present invention, limiting components are fixedly installed on both the first mesh belt and the second mesh belt, and the limiting components are arranged in two columns on the first mesh belt and the second mesh belt respectively.

[0021] In one or more embodiments of the present invention, the limiting component includes a bracket, a limiting groove, and a rubber block. The bracket is fixedly connected to two columns on the first mesh belt and the second mesh belt, respectively. The bracket has a limiting groove, and a rubber block is fixedly connected to the limiting groove. The rubber block is a high-temperature resistant rubber block.

[0022] In one or more embodiments of the present invention, the drive guide mechanism includes a cylinder, a guide rail and a through groove. The cylinder is fixedly mounted on an integrated base. The telescopic end of the cylinder is fixedly connected to the main frame. Multiple sets of through grooves are opened on the main frame. Multiple sets of guide rails are fixedly connected on the integrated base. The guide rails pass through the through grooves. The cylinder can drive the main frame to slide on the guide rails.

[0023] In one or more embodiments of the present invention, a sinking groove is provided at one end of the integrated base, and a cleaning mechanism is installed inside the sinking groove. The cleaning mechanism is capable of automatically cleaning the first mesh belt and the second mesh belt.

[0024] To achieve the above objectives, embodiments of the present invention provide a method for using an integrated solar cell sintering and light injection device, the integrated solar cell sintering and light injection device comprising the following steps:

[0025] S1, the cylinder pushes and pulls the main frame to move horizontally and reciprocally, so that the first mesh belt and the second mesh belt alternately receive the battery cells from the sheet guide machine;

[0026] S2, the solar cells are conveyed by the first and second mesh belts through the sintering zone to complete sintering, and then through the cooling zone to complete cooling;

[0027] S3, the solar cell is conveyed into the light injection region on the first and second mesh belts, and light injection is completed inside the light injection region;

[0028] S4, the sintered and photo-injected solar cells are fed out on the first and second mesh belts.

[0029] Compared with the prior art, the embodiments of the present invention have the following technical effects:

[0030] This invention enables a single machine to perform multi-line production by setting up two alternating conveyor belts inside the furnace, without the need for additional supporting production lines, thus increasing production capacity at a lower cost. Furthermore, the solar cells move back and forth while being directionally transported on the conveyor belts, ensuring uniform heating, improving yield, and generating turbulence that makes the distribution of impurities in the furnace exhaust gas more uniform, facilitating rapid impurity removal and improving the quality of solar cell production. Moreover, if one conveyor belt fails, the other can still operate normally without downtime for maintenance, ensuring production capacity while avoiding significant economic losses for the company.

[0031] This invention can recover and utilize the heat in the exhaust gas discharged from the exhaust system through a heat compensation system, so that the recovered heat can be reused for sintering or photoinjection, saving energy and bringing convenience to the subsequent treatment of exhaust gas.

[0032] This invention uses a cleaning mechanism to automatically clean the conveyor belts during the reciprocating movement of the two sets of conveyor belts, thus preventing the battery cells from being contaminated on the conveyor belts. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a solar cell sintering and photoinjection integrated device according to an embodiment of the present invention. Figure 1 ;

[0034] Figure 2 This is a schematic diagram of a solar cell sintering and photoinjection integrated device according to an embodiment of the present invention. Figure 2 ;

[0035] Figure 3 This is a partial structural schematic diagram of a solar cell sintering and photoinjection integrated device according to an embodiment of the present invention;

[0036] Figure 4 This is a partial top view of a solar cell sintering and photoinjection integrated device according to an embodiment of the present invention;

[0037] Figure 5 This is an integrated solar cell sintering and photoinjection device according to an embodiment of the present invention. Figure 3 Enlarged view of point A in the middle;

[0038] Figure 6 This is an integrated solar cell sintering and photoinjection device according to an embodiment of the present invention. Figure 4 Enlarged view at point B in the middle;

[0039] Figure 7 This is a schematic diagram of a limiting component structure for an integrated solar cell sintering and light injection device according to an embodiment of the present invention.

[0040] Figure 8 This is a side view of a solar cell sintering and light injection integrated device according to an embodiment of the present invention;

[0041] Figure 9 This is a partial cross-sectional side view of a solar cell sintering and photoinjection integrated device according to an embodiment of the present invention;

[0042] Figure 10 This is a cross-sectional view of a cleaning mechanism in an integrated solar cell sintering and photoinjection device according to an embodiment of the present invention.

[0043] Figure 11 This is a partial cross-sectional top view of a solar cell sintering and photoinjection integrated device according to an embodiment of the present invention;

[0044] Figure 12 This is a flowchart illustrating the usage method of an integrated solar cell sintering and photoinjection apparatus according to an embodiment of the present invention.

[0045] Explanation of key figure labels:

[0046] 1. Integrated base; 2. Sintering chamber; 201. Sintering zone; 202. Cooling zone; 3. Light injection chamber; 301. Light injection zone; 4. Exhaust system; 401. Main exhaust pipe; 402. Branch exhaust pipe; 403. Heat exchanger tube; 404. Fins; 5. Thermal compensation system; 501. Heat recovery box; 502. Main heat supply pipe; 503. Branch heat supply pipe; 504. Inlet pipe; 6. Fin guide; 7. Feeding mechanism; 01. Main frame; 702. First mesh belt; 703. Second mesh belt; 8. Control panel; 9. Cylinder; 10. Sinking trough; 11. Cleaning mechanism; 1101. Dust collection hopper; 1102. Cleaning brush; 1103. Negative pressure pump; 1104. Filter assembly; 12. Baffle plate; 13. Limiting assembly; 1301. Bracket; 1302. Limiting slot; 1303. Rubber block; 14. Guide rail; 15. Through groove. Detailed Implementation

[0047] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0048] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0049] like Figures 1 to 11As shown, a battery chip sintering and light injection integrated device according to a preferred embodiment of the present invention includes a sintering and light injection integrated furnace, on which a control panel 8 is installed, and various parameters can be set through the control panel 8. The sintering and light injection integrated furnace includes an integrated machine base 1, a sintering chamber 2 and a light injection chamber 3. The sintering chamber 2 and the light injection chamber 3 are both fixedly installed on the integrated machine base 1, and the sintering chamber 2 and the light injection chamber 3 are integrally arranged to jointly form an integrated furnace body. The battery chips are heated and sintered in sequence inside the sintering chamber 2, cooled, and then enter the light injection chamber 3 for light injection.

[0050] Among them, Figure 1 and Figure 2 As shown, the sintering chamber 2 includes a sintering area 201 and a cooling area 202. The sintering area 201 includes three heating chambers with different temperatures arranged in sequence, and each of the three heating chambers with different temperatures is equipped with an independent heating element. The cooling method of the battery chips inside the cooling area 202 is air cooling combined with water cooling.

[0051] Preferably, in this embodiment, the heating element is preferably an infrared quartz lamp tube. Using the radiation heating principle, it can quickly heat an object and make the battery chips reach the eutectic temperature in a very short time. Moreover, radiation heating has the advantages of economy in use, safety and reliability, and convenience in replacement.

[0052] Preferably, the types of infrared quartz lamp tubes in the three heating chambers with different temperatures are medium-wave tubes, short-wave tubes, and medium-wave tubes in sequence. The first heating chamber contains medium-wave tubes with a heating temperature of 450 - 800 °C, the second heating chamber contains short-wave tubes with a heating temperature of 900 - 1200 °C, and the third heating chamber contains medium-wave tubes with a heating temperature of 400 - 700 °C.

[0053] Refer Figure 1 and Figure 2 As shown, the light injection chamber 3 includes a light injection area 301, and the light injection area 301 includes three chambers of temperature rise, heat preservation, and light irradiation arranged in sequence. Among them, the heating element in the temperature rise chamber is an infrared quartz lamp tube with a heating temperature of 300 - 600 °C, and the temperature of the heat preservation chamber is 150 - 250 °C.

[0054] An LED lamp board or an infrared laser lamp board is installed in the light irradiation chamber, and both high-intensity white light or infrared light irradiation can make the light injection of the battery board reach saturation.

[0055] Preferably, in this embodiment, the more energy-saving LED lamp board is preferably selected to irradiate and inject light into the sintered battery chips. Among them, in order to maintain the constant temperature effect of the LED lamp board and avoid the situation of overheating damage caused by continuous temperature rise, a cooling air pipe and a cooling water pipe are also connected to the LED lamp board to cool it down, so that the temperature of the LED lamp board itself remains stable to ensure its normal operation and extend its service life.

[0056] As shown in Figure 2 and Figure 11 shown, the exhaust system 4 is used to discharge the waste gas during the sintering process of the battery wafers. The exhaust system 4 includes an exhaust main pipe 401, exhaust branch pipes 402, heat exchange pipes 403 and fins 404. Among them, three groups of exhaust branch pipes 402 are installed on the exhaust main pipe 401, and the three groups of exhaust branch pipes 402 are respectively connected to three heating chambers with different temperatures, and are used for discharging the waste gas inside the heating chambers. The heat exchange pipe 403 is installed on the exhaust main pipe 401.

[0057] Specifically, the heat exchange pipe 403 is arranged in an "S" shape, and the fins 404 are fixedly installed on the heat exchange pipe 403. The fins 404 can increase the contact area between the heat exchange pipe 403 and the air, and improve the heat exchange efficiency between the heat exchange pipe 403 and the air. The materials of the heat exchange pipe 403 and the fins 404 can be carbon steel, low alloy steel, stainless steel, copper, copper-nickel alloy, aluminum alloy, titanium, etc. In this embodiment, the material of the heat exchange pipe 403 is preferably a stainless steel heat exchange pipe with strong high temperature resistance and corrosion resistance. The material of the fins 404 is preferably a copper heat exchange pipe with stronger heat exchange capacity, so as to ensure the efficient heat exchange between the waste gas and the air, facilitate the cooling of the waste gas and the recovery and utilization of heat.

[0058] As shown in Figure 2 , Figure 8 and Figure 11 shown, a thermal compensation system 5 is installed on the sintering bin 2. The thermal compensation system 5 can recover the heat in the waste gas discharged by the exhaust system 4, and can use the heat to compensate the three heating chambers with different temperatures in the sintering area 201 or the heating chamber in the light injection area 301.

[0059] Specifically, the thermal compensation system 5 includes a heat recovery box 501, a heat supply main pipe 502, heat supply branch pipes 503 and an air inlet pipe 504. The heat exchange pipe 403 is installed inside the heat recovery box 501, and the heat recovery box 501 is fixedly installed on the top of the sintering bin 2. One end of the air inlet pipe 504 is fixedly connected to the heat recovery box 501, and the other end of the air inlet pipe 504 is connected to an air pump, which can inject air into the heat recovery box 501. Among them, an air filter is also installed on the air inlet pipe 504, which can clean the air and ensure that the air entering the heat recovery box 501 is clean air.

[0060] As shown in Figure 2 and Figure 11 shown, the heat supply main pipe 502 is installed between the heat recovery box 501 and the heating chamber in the light injection area 301. The clean air entering the heat recovery box 501 can be sent into the heating chamber through the heat supply main pipe 502 after being heated by exchanging heat with the heat exchange pipe 403, so as to maintain the temperature inside the heating chamber, and enable the heating chamber to realize the preheating of the battery wafers before light injection without relying on heating lamps.

[0061] As shown in FIGS. Figure 2 and Figure 11 As shown, there are three groups of heat supply branch pipes 503 installed on the heat supply main pipe 502, and the three groups of heat supply branch pipes 503 are respectively connected to the inside of three heating chambers with different temperatures. The clean air heated after heat exchange with the heat exchange pipe 403 can be sent into the temperature-raising chamber in the optical injection area 301, and can also be sent into the inside of the three heating chambers with different temperatures through the heat supply branch pipes 503 respectively, so as to realize the compensation of the temperature inside the heating chamber. Solenoid valves are provided on the heat supply branch pipes 503 to facilitate the control of the operation of the heat compensation system 5.

[0062] Specifically, under the normal working state of the equipment, the clean air sent into the heat recovery box 501 by the air inlet pipe 504 is indirectly and efficiently heat-exchanged with the waste gas through the heat exchange pipe 403 and the fins 404 and then heated. The clean hot air will be sent into the inside of the heating chamber in the optical injection area 301 through the heat supply main pipe 502, and the battery wafers to be optically injected are preheated by using the clean hot air.

[0063] It should be noted that when the infrared quartz lamps in the three heating chambers with different temperatures fail and the temperature of the heating chamber cannot reach the required temperature, the solenoid valve on the corresponding heat supply branch pipe 503 is opened, and the hot air inside the heat supply main pipe 502 will enter the heating chamber through the heat supply branch pipe 503, perform heat compensation on the heating chamber, maintain the normal working temperature of the heating chamber, and enable the heating chamber to work normally. In this way, even if the infrared quartz lamp in the heating chamber fails, the normal heating and sintering process can still be carried out.

[0064] As shown in FIGS. Figure 1 and Figure 2 As shown, the guiding machine 6 is equipped with a mesh belt identical to the first mesh belt 702 and the second mesh belt 703, and the mesh belt on the guiding machine 6 is on the same horizontal plane as the first mesh belt 702 and the second mesh belt 703, and is used to supply the battery wafers to be sintered to the equipment.

[0065] As shown in FIGS. Figure 1 , Figure 3 and Figure 4 As shown, the feeding mechanism 7 includes a main body frame 701, a first mesh belt 702 and a second mesh belt 703. The first mesh belt 702 and the second mesh belt 703 are both installed on the main body frame 701, and the main body frame 701 can reciprocate, so that the first mesh belt 702 and the second mesh belt 703 can alternately receive the battery wafers to be sintered on the guiding machine 6, so as to sinter and optically inject the battery wafers on the two mesh belts at the same time.

[0066] Among them, as shown in FIGS. Figure 3 and Figure 4As shown, the first mesh belt 702 and the second mesh belt 703 are two parallel metal mesh belts in the same plane. During the reciprocating movement of the main frame 701, the first mesh belt 702 and the second mesh belt 703 can alternately align with the mesh belt on the sheet guiding machine 6, so as to alternately receive the battery wafers supplied on the sheet guiding machine 6.

[0067] Specifically, the battery wafers on the first mesh belt 702 and the second mesh belt 703 can be synchronously fed into the furnace for sintering and photo-injection. This enables multi-line production within a set of equipment, greatly improving the production capacity.

[0068] Since the time required for sintering and photo-injection is relatively long, it is one of the main reasons restricting the production capacity of the production line. By realizing multi-line production with a single device and increasing the production rate of a single device, the process rate at the front end of sintering and photo-injection on the production line can be appropriately increased, thereby improving the production rate of the entire production line.

[0069] In this embodiment, while improving the production capacity of battery wafers through multi-line synchronous sintering and photo-injection, there is no need to additionally increase other supporting equipment, and technical innovation can be achieved at a relatively low cost, bringing good benefits to relevant enterprises.

[0070] In addition, during the reciprocating movement of the main frame 701, it can also produce the effect of disturbing air flow, making the battery wafers受热 more evenly during the sintering process, and at the same time making the impurities in the waste gas evenly distributed, facilitating the rapid and uniform discharge of the impurities in the waste gas, which is beneficial to improving the production quality of battery wafers.

[0071] Specifically, through the reciprocating movement of the main frame 701, it will drive the flow of the air flow in the furnace, making the heat distribution in the furnace more uniform. Through the disturbance of the air flow, the impurities volatilized from the battery wafers can diffuse into the air in the furnace faster and more evenly, so that the impurities can be discharged more timely along with the air flow. At the same time, it enables the battery wafers to move vertically in a direction perpendicular to the conveying direction while being conveyed in a fixed direction, so that the battery wafers can be heated while moving. This makes the heating of the battery wafers more uniform and sufficient, and basically there will be no situation of local uneven heating causing bulging or generating aluminum beads, improving the yield rate of battery wafers during the production process.

[0072] Refer to Figures 3-6 As shown, a plurality of spoiler plates 12 are fixedly connected to the main frame 701, and the plurality of spoiler plates 12 are arranged obliquely and at equal intervals. When the main frame 701 reciprocates, the plurality of obliquely arranged spoiler plates 12 on the main frame 701 will reciprocate in the furnace along with it. Through the spoiler plates 12, the spoiler effect can be effectively improved, making the heat distribution in the furnace more uniform and the effect of increasing the discharge rate of impurities more significant, which is of great help to improving the production quality of battery wafers.

[0073] During the process of photo-injection of the battery cells on the first conveyor belt 702 and the second conveyor belt 703, the battery cells are also moving reciprocally. Photo-irradiation is carried out during the movement to achieve photo-injection, making the photo-irradiation more uniform, and enabling all parts of the battery cells to receive photo-injection from different incident light surface directions, so that the photo-injection of the battery cells can reach the saturation effect faster, shortening the photo-injection time of the battery cells and improving the photo-injection efficiency.

[0074] It should be noted that the operations of the first conveyor belt 702 and the second conveyor belt 703 are respectively driven by two sets of synchronous motors, and each set of synchronous motors is controlled by a set of independent variable frequency controllers. When a failure occurs during the operation of any one of the first conveyor belt 702 and the second conveyor belt 703, the normally operating set can be aligned with the conveyor belt on the sheet guiding machine 6, and the main frame 701 can be stopped from moving reciprocally, so as to carry out single-line feeding. At this time, multi-line production becomes single-line production.

[0075] The power of the motor is increased by frequency conversion to increase the running speed of the normally operating conveyor belt set to match the running speed of the conveyor belt on the sheet guiding machine 6. Due to the increase in the running speed of the conveyor belt, the sintering and photo-injection time of the battery cells will be shortened. At this time, by increasing the sintering temperature and the photo-irradiation intensity, it is ensured that the battery cells are fully sintered and saturated photo-injected. At the same time, the faulty conveyor belt set can be repaired. Thus, the maintenance of the conveyor belt can be carried out without stopping the machine, ensuring the production capacity and avoiding serious economic losses brought to the enterprise by machine shutdown.

[0076] Refer to Figure 3 、 Figure 8 and Figure 9 As shown in

[0077] The driving and guiding mechanism is used to drive the feeding mechanism 7 to move horizontally reciprocally. The driving and guiding mechanism includes a cylinder 9, a guide rail 14 and a through groove 15. The cylinder 9 is fixedly installed on the integrated machine base 1. The telescopic end of the cylinder 9 is fixedly connected to the main frame 701. Multiple groups of through grooves 15 are opened on the main frame 701, and multiple groups of guide rails 14 are fixedly connected to the integrated machine base 1. The guide rail 14 penetrates through the through groove 15, and the cylinder 9 can drive the main frame 701 to slide on the guide rail 14.

[0078] Reference Figure 3 and Figure 7 As shown, limit components 13 are fixedly installed on both the first mesh belt 702 and the second mesh belt 703. Two columns of limit components 13 are provided on the first mesh belt 702 and the second mesh belt 703 respectively. The limit component 13 includes a bracket 1301, a limit notch 1302 and a rubber block 1303. The bracket 1301 is fixedly connected to two columns on the first mesh belt 702 and the second mesh belt 703 respectively. The two columns of brackets 1301 are symmetrically located at the edge positions on both sides of the mesh belt. A limit notch 1302 is formed on the bracket 1301. Among them, the bracket 1301 is a ceramic bracket, which is not easy to cause wear to the battery chips.

[0079] Specifically, the two sides of the battery chips on the mesh belt will overlap inside the limit notches 1302 on the two columns of brackets 1301, so that the two sides have a limiting effect and will not easily shake and shift, which is convenient for more stable transmission. At the same time, the battery chips are in a suspended state under the support of the bracket 1301, and their backs will not contact the mesh belt, so that the situation of wear can be effectively avoided.

[0080] It should be noted that a rubber block 1303 is fixedly connected to the limit notch 1302, and the rubber block 1303 is a high-temperature resistant rubber block. During the reciprocating movement of the main body frame 701, due to the inertia, the two sides of the battery chips will shake inside the limit notch 1302 and collide with the inner wall of the limit notch 1302, causing varying degrees of damage to the battery chips. Through the setting of the rubber block 1303, good buffer protection can be provided for the battery chips, avoiding damage to the battery chips during the collision and ensuring the quality of the battery chips.

[0081] Reference Figure 8 and Figure 9 As shown, a sinking groove 10 is formed at one end of the integrated machine base 1, and a cleaning mechanism 11 is installed inside the sinking groove 10. Through the cleaning mechanism 11, the first mesh belt 702 and the second mesh belt 703 can be automatically cleaned.

[0082] Among them, as shown in Figure 9 and Figure 10 , the cleaning mechanism 11 includes a dust collection hopper 1101, a cleaning brush 1102, a negative pressure pump 1103 and a filtering component 1104. The dust collection hopper 1101 is fixedly installed inside the sinking groove 10. Two groups of cleaning brushes 1102 are installed on the top of the dust collection hopper 1101, and the tops of the two groups of cleaning brushes 1102 can respectively contact the bottoms of the first mesh belt 702 and the second mesh belt 703. The filtering component 1104 is installed at the bottom end inside the dust collection hopper 1101, and the filtering component 1104 adopts a bag filter. The input end of the negative pressure pump 1103 is fixedly connected to the bottom of the dust collection hopper 11*01.

[0083] ​Specifically, during the reciprocating movement of the main frame 701, the first mesh belt 702 and the second mesh belt 703 continuously rub against the cleaning brush 1102. During this process, the cleaning brush 1102 cleans the surfaces of the first mesh belt 702 and the second mesh belt 703, thereby removing dust and other contaminants adhering to the surfaces of the first mesh belt 702, the second mesh belt 703, and the limiting component 13. This ensures the cleanliness of the surfaces of the first mesh belt 702 and the second mesh belt 703, preventing the battery cells from becoming contaminated during transport on the first mesh belt 702 and the second mesh belt 703.

[0084] The negative pressure pump 1103 can draw air from inside the dust collection hopper 1101, creating a negative pressure inside the dust collection hopper 1101. This negative pressure allows for the extraction of contaminants cleaned from the first mesh belt 702 and the second mesh belt 703. The cleaned contaminants are immediately drawn into the dust collection hopper 1101 and collected inside by the filter assembly 1104, preventing the contaminants from spreading outwards and causing pollution.

[0085] like Figure 12 As shown, a method of using a solar cell sintering and photoinjection integrated device according to a preferred embodiment of the present invention includes the following steps:

[0086] S1, the cylinder 9 pushes and pulls the main frame 701 to move horizontally back and forth, so that the first mesh belt 702 and the second mesh belt 703 alternately receive the battery cells from the sheet guide machine 6;

[0087] S2, the battery cells are conveyed by the first mesh belt 702 and the second mesh belt 703 through the sintering zone 201 to complete sintering, and then through the cooling zone 202 to complete cooling.

[0088] S3, the solar cell is conveyed into the light injection region 301 on the first mesh belt 702 and the second mesh belt 703, and light injection is completed inside the light injection region 301.

[0089] S4, the sintered and photo-injected solar cells are fed out on the first mesh belt 702 and the second mesh belt 703.

[0090] Specifically, cylinder 9 drives the main frame 701 to reciprocate on guide rail 14, causing the first mesh belt 702 and the second mesh belt 703 on the main frame 701 to alternately receive battery cells from the wafer guide 6. The battery cells are conveyed into the furnace on the first mesh belt 702 and the second mesh belt 703, passing sequentially through the three heating chambers of the sintering zone 201 at different temperatures to complete sintering. Then, they pass through the cooling zone 202, where they are cooled by a combination of air cooling and water cooling.

[0091] Next, the solar cell is fed into the light injection zone 301, first passing through the heating chamber of the light injection zone 301, then through the heat preservation chamber, and then into the light irradiation zone, where it is light injected by the LED light panel. Finally, the solar cell is sent out on the first mesh belt 702 and the second mesh belt 703, completing the sintering and light injection process of the solar cell.

[0092] During use, the printed and dried solar cells are transferred to the front end of the equipment on the guide machine 6. At this time, the first mesh belt 702 and the second mesh belt 703 take turns receiving the material, so that the solar cells on the guide machine can be supplied more quickly. Then, the sintering and photoinjection process is carried out efficiently through the multi-line transmission of a single machine.

[0093] This invention enables a single machine to perform multi-line production by setting up two alternating conveyor belts inside the furnace, without the need for additional supporting production lines, thus increasing production capacity at a lower cost. Furthermore, the solar cells move back and forth while being directionally transported on the conveyor belts, ensuring uniform heating, improving yield, and generating turbulence that makes the distribution of impurities in the furnace exhaust gas more uniform, facilitating rapid impurity removal and improving the quality of solar cell production. Moreover, if one conveyor belt fails, the other can still operate normally without downtime for maintenance, ensuring production capacity while avoiding significant economic losses for the company.

[0094] The present invention can recover and utilize the heat in the exhaust gas discharged by the exhaust system 4 through the heat compensation system 5, so that the recovered heat can be reused for sintering or light injection, saving energy and bringing convenience to the subsequent treatment of exhaust gas.

[0095] The present invention can automatically clean the conveyor belts during the reciprocating movement of the two sets of conveyor belts through the cleaning mechanism 11, so as to avoid the battery cells being contaminated on the conveyor belts.

[0096] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A solar cell sintering and photoinjection integrated device, characterized in that, include: The sintering-light-injection integrated furnace includes an integrated base, a sintering chamber and a light-injection chamber. The solar cells are heated and sintered and cooled sequentially inside the sintering chamber before entering the light-injection chamber for light injection. The exhaust system is used to remove waste gas from the sintering process of the battery cells; A wafer guide is used to supply the solar cells to be sintered to the equipment. The feeding mechanism includes a main frame, a first mesh belt and a second mesh belt. Both the first mesh belt and the second mesh belt are mounted on the main frame. The main frame can reciprocate so that the first mesh belt and the second mesh belt can alternately receive the solar cells to be sintered on the wafer guide machine, thereby simultaneously sintering and light-injecting the solar cells on the two mesh belts. Drive guide mechanism, used to drive the feeding mechanism to move horizontally reciprocating; Multiple sets of baffles are fixedly connected to the main frame, and the baffles are inclined. During the reciprocating movement of the main frame, the baffles can also generate the effect of disturbing the airflow, so that the heat of the battery cells is more uniform during the sintering process, and at the same time, the impurities in the exhaust gas are evenly distributed, which facilitates the rapid and uniform discharge of impurities in the exhaust gas and helps to improve the production quality of the battery cells. Limiting components are fixedly installed on both the first and second mesh belts, and the limiting components are arranged in two columns on the first and second mesh belts respectively; One end of the integrated base is provided with a sinking groove, and a cleaning mechanism is installed inside the sinking groove. During the reciprocating movement of the main frame, the cleaning mechanism can automatically clean the first and second mesh belts.

2. The apparatus according to claim 1, wherein the apparatus is characterized by: The sintering chamber includes a sintering zone and a cooling zone. The sintering zone includes three heating chambers with different temperatures arranged in sequence. The battery cells are cooled in the cooling zone by a combination of air cooling and water cooling.

3. The apparatus according to claim 1, wherein the apparatus is characterized by: The light injection chamber includes a light injection area, which comprises three chambers arranged sequentially: a heating chamber, a heat preservation chamber, and a light irradiation chamber.

4. The apparatus according to claim 1, wherein the apparatus is characterized by: The sintering chamber is equipped with a heat compensation system, which can recover the heat from the exhaust gas discharged by the exhaust system and use the heat to compensate for the heating chambers with different temperatures in the three heating chambers of the sintering zone or the heating chamber in the light injection zone.

5. The apparatus according to claim 1, wherein the apparatus is characterized by: The limiting component includes a bracket, a limiting groove, and a rubber block. The bracket is fixedly connected to two columns on the first mesh belt and the second mesh belt, respectively. The bracket has a limiting groove, and a rubber block is fixedly connected to the limiting groove. The rubber block is a high-temperature resistant rubber block.

6. The apparatus according to claim 1, wherein the apparatus is characterized by: The drive and guide mechanism includes a cylinder, a guide rail, and a through groove. The cylinder is fixedly mounted on the integrated base, and the telescopic end of the cylinder is fixedly connected to the main frame. Multiple sets of through grooves are opened on the main frame, and multiple sets of guide rails are fixedly connected on the integrated base. The guide rails pass through the through grooves, and the cylinder can drive the main frame to slide on the guide rails.

7. A method of using a solar cell sintering and light-injection integrated device, comprising the solar cell sintering and light-injection integrated device as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1, the cylinder pushes and pulls the main frame to move horizontally and reciprocally, so that the first mesh belt and the second mesh belt alternately receive the battery cells from the sheet guide machine; S2, the solar cells are conveyed on the first and second mesh belts, pass through the sintering zone to complete sintering, and then pass through the cooling zone to complete cooling; S3, the solar cell is conveyed into the light injection region on the first and second mesh belts, and light injection is completed inside the light injection region; S4, the sintered and photo-injected solar cells are fed out on the first and second mesh belts.

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