Light injection device

Abstract

The utility model relates to light injection equipment which is used for carrying out light injection on a battery piece and comprises a conveying assembly, a heating assembly, an illumination assembly and a cooling assembly, the conveying assembly is used for conveying the battery piece so that the battery piece can sequentially penetrate through the heating assembly, the illumination assembly and the cooling assembly, and the heating assembly is used for heating the battery piece; the illumination assembly comprises an illumination module and a first heating module, the illumination module is arranged above the conveying assembly to irradiate the battery pieces from the upper portion, and the first heating module is arranged below the conveying assembly to be used for heating the battery pieces on the conveying assembly; and the cooling assembly is used for cooling the battery piece penetrating through the illumination assembly. Hydrogen atoms in the battery piece are activated through the heating assembly, and then the hydrogen atoms are ionized through the illumination assembly, so that a non-composite center is formed; and finally, the rate of re-activation of the passivated defects is reduced through the cooling assembly, the passivation effect is improved, the defects in the battery piece reach a stable state, and meanwhile the conversion efficiency of the battery piece is improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a light injection device. Background Art

[0002] A solar cell is a photoelectric element that converts solar energy into electrical energy. It is composed of a P-type and N-type semiconductor junction, forming a large-area PN junction. TOPCon is a tunnel oxide passivated contact (Tunnel Oxide Passivated Contact) solar cell technology based on the principle of selective carriers. Its cell structure is an N-type silicon substrate cell. An ultra-thin layer of silicon oxide is deposited on the back of the cell, followed by a thin layer of doped silicon, which together form a passivated contact structure. The passivation properties are activated through a light injection annealing process. During this process, the crystallinity of the silicon film changes from a microcrystalline amorphous mixed phase to a polycrystalline one. This provides excellent interface passivation on the back of the silicon substrate, effectively reducing surface recombination and metal contact recombination in the silicon film. The cell also has an aluminum oxide film layer, which forms a passivation effect together with other film layers to passivate the back of the silicon substrate. Since aluminum oxide has a large amount of fixed negative charge, it can produce a strong field passivation effect, which can completely eliminate the parasitic capacitance effect and provide a good surface passivation effect for boron and aluminum doped P+ type emitters, P type and N type silicon substrates, thereby reducing the back surface recombination rate and improving the impurity gettering effect on the surface of the silicon substrate.

[0003] Light injection annealing is a technology that uses the injection of light energy to repair or reduce defects on the cell surface caused by the annealing process. First, during the light injection annealing process, light energy is injected into the cell to excite local charges, thereby generating additional photogenerated carriers. These carriers can fill the surface force field, thereby reducing cell defects and increasing the effective life of the carriers. Secondly, light injection annealing can repair defects on the cell surface and increase the open circuit voltage and short circuit current of the cell. In addition, light injection annealing can also improve the reflection characteristics of the cell and increase the absorption and utilization rate of light. However, during the oxide layer passivation process and the coating process of the existing light injection device, the recombination caused by the introduction of hydrogen atoms will cause the conversion efficiency of the TOPCon cell to decay and reduce the stability, resulting in the production of defective products. Utility Model Content

[0004] Based on this, it is necessary to provide a light injection device that can improve the conversion efficiency and stability of solar cells.

[0005] A light injection device is used to inject light into a battery cell, comprising a conveying component and a heating component, an illumination component, and a cooling component arranged in sequence. The conveying component is used to transport the battery cell so that the battery cell passes through the heating component, the illumination component, and the cooling component in sequence. The heating component is used to heat the battery cell; the illumination component comprises an illumination module and a first heating module. The illumination module is arranged above the conveying component to illuminate the battery cell from above, and the first heating module is arranged below the conveying component to heat the battery cell on the conveying component; the cooling component is used to cool the battery cell after passing through the illumination component.

[0006] It can be understood that the present application can rapidly heat up the cell and gradually cool down the cell through the heating component to activate the hydrogen atoms in the silicon nitride passivation film of the cell, increase the diffusion rate of the hydrogen atoms, and thus reactivate the passivated recombination center defects; then the illumination power is controlled by the illumination module in the illumination component. When light is irradiated to the activated hydrogen atoms, the hydrogen atoms absorb the energy of the light and ionize, and the hydrogen atoms become positively charged hydrogen ions. Since the recombination center defects carry a negative charge, the positively charged hydrogen ions in the cell are respectively ionized with the P + The recombination center defects at the emitter and the N-type substrate are combined to form a non-recombination center; at the same time, the first heating module also provides energy for the ionization of hydrogen atoms, and provides a stable reaction environment for the above reaction process by controlling the temperature, so that the illumination component can better control the valence state of the hydrogen atoms, thereby achieving a good passivation effect, and improving the maximum voltage and photoelectric conversion efficiency of the battery cell when the load is disconnected; finally, rapid cooling through the cooling component can reduce the rate of reactivation of the passivated defects, make the passivated structure denser, and have a good passivation effect, so that the defects inside the battery cell reach a stable state, while improving the conversion efficiency of the battery cell.

[0007] In one embodiment, the heating component includes a second heating module and a third heating module, the second heating module is arranged above the conveying component, and the third heating module is arranged below the conveying component.

[0008] In one embodiment, the temperature range of the first heating module is 0 to 500 degrees Celsius, the temperature range of the second heating module is 0 to 1000 degrees Celsius, and the temperature range of the third heating module is 0 to 1100 degrees Celsius.

[0009] In one embodiment, the illumination module includes an illumination box, wherein LED lamp beads are provided inside the illumination box, and the current range of the illumination box is 0 to 5 amps.

[0010] In one embodiment, the illumination assembly further includes a first cooling structure and a second cooling structure, wherein the first cooling structure is connected to the illumination module, and the second cooling structure is provided on one side of the first heating module;

[0011] The heating component further includes a third cooling structure and a fourth cooling structure. The third cooling structure is connected to the second heating module, and the fourth cooling structure is arranged on one side of the third heating module.

[0012] In one embodiment, the first cooling structure and the third cooling structure both use gas as the cooling medium, and the second cooling structure and the fourth cooling structure both use liquid as the cooling medium;

[0013] The first cooling structure includes a first cooling pipe and a first fan, the first cooling structure includes a second cooling pipe, the third cooling structure includes a third cooling pipe and a second fan, and the fourth cooling structure includes a fourth cooling pipe.

[0014] The second cooling structure is arranged in a one-to-one correspondence with the first heating module, and the fourth cooling structure is arranged in a one-to-one correspondence with the third heating module.

[0015] In one embodiment, the system further comprises at least four temperature measuring elements, which are respectively used to measure the temperatures of the illumination module, the first heating module, the second heating module, and the third heating module.

[0016] In one embodiment, the cooling component is arranged above the conveying component, and the cooling component includes a fifth cooling pipe and a third fan.

[0017] In one embodiment, the conveying component is a mesh belt, a roller, a conveyor roller or a belt.

[0018] In one embodiment, the light injection device further includes a furnace body, in which a heating cavity, an illumination cavity and a cooling cavity are provided. The heating component is arranged in the heating cavity, the illumination component is arranged in the illumination cavity, and the cooling component is arranged in the cooling cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following is a brief introduction to the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1Schematic diagram of the structure of a light injection device according to an embodiment of the present application.

[0021] Figure numerals: 10, furnace body; 100, heating component; 110, second heating module; 120, third heating module; 130, third cooling structure; 131, third cooling pipe; 132, second fan; 200, illumination component; 210, illumination module; 211, illumination box; 220, first heating module; 221, heating lamp; 230, first cooling structure; 231, first cooling pipe; 232, first fan; 300, cooling component; 301, fifth cooling pipe; 302, third fan; 400, conveying component; 500, battery cell. DETAILED DESCRIPTION

[0022] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0023] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0025] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0027] See Figure 1 The present application provides a light injection device for injecting light into a battery cell 500, including a conveying component 400 and a heating component 100, an illumination component 200, and a cooling component 300 arranged in sequence. The conveying component 400 is used to transport the battery cell 500 so that the battery cell 500 passes through the heating component 100, the illumination component 200, and the cooling component 300 in sequence. The heating component 100 is used to heat the battery cell 500; the illumination component 200 includes an illumination module 210 and a first heating module 220. The illumination module 210 is arranged above the conveying component 400 to illuminate the battery cell 500 from above, and the first heating module 220 is arranged below the conveying component 400 to heat the battery cell 500 on the conveying component 400; the cooling component 300 is used to cool the battery cell 500 after passing through the illumination component 200.

[0028] It can be understood that for the cell 500 that needs to be light-injected annealed, the cell 500 is placed on the conveying assembly 400, and the conveying assembly 400 transports the cell 500 through the heating assembly 100, the illumination assembly 200 and the cooling assembly 300 in sequence. When the cell 500 passes through the heating assembly 100, the heating assembly 100 quickly heats up and then gradually cools down. The temperature change can activate the hydrogen atoms in the silicon nitride passivation film of the cell 500, increase the diffusion rate of the hydrogen atoms, and thus reactivate the passivated recombination center defects; then, the conveying assembly 400 transports the cell 500 leaves the heating component 100 and enters the illumination component 200. The illumination module 210 located above the conveying component 400 irradiates the cell 500. The activated hydrogen atoms receive the energy of light and ionize. The first heating module 220 located below the conveying component 400 heats the cell 500 and maintains the temperature of the back of the cell 500 stable. The first heating module 220 also provides energy for the ionization of hydrogen atoms. The hydrogen atoms are ionized to become positively charged hydrogen ions. Since the recombination center defects have negative charges, the positively charged hydrogen ions in the cell are respectively + The recombination center defects at the emitter and N-type substrate combine to form non-recombination centers, thereby achieving a good passivation effect, increasing the voltage of the cell 500 when no load is connected, improving the fill factor (FF), and improving the conversion efficiency of the cell 500. At the same time, the first heating module 220 also provides a stable reaction environment for the ionization of hydrogen atoms and the process of positively charged hydrogen atoms combining with negatively charged defects by controlling the temperature, enabling the illumination component 200 to better control the valence state of hydrogen atoms. It is understandable that the temperature that the first heating module 220 can reach is lower than the temperature that the heating component 100 can reach. Finally, when the conveying component 400 transports the cell 500 into the cooling component 300, the cooling component 300 quickly cools the cell 500 to prevent the passivated defects from being reactivated, making the passivated structure more dense and the passivation effect better, so that the defects inside the cell 500 reach a stable state, while improving the conversion efficiency of the cell 500. It should be noted that the back surface of the cell 500 refers to the surface not illuminated by the light emitted by the illumination module 210 , and the front surface of the cell 500 refers to the surface illuminated by the light emitted by the illumination module 210 .

[0029] In one embodiment, the heating component 100 includes a second heating module 110 and a third heating module 120. The second heating module 110 is arranged above the conveying component 400, and the third heating module 120 is arranged below the conveying component 400. It can be understood that since the back of the battery cell 500 has an oxide film layer, while the front of the battery cell 500 does not have an oxide film layer, the temperature that the front of the battery cell 500 can withstand is lower than the temperature that the back of the battery cell 500 can withstand. In this embodiment, by dividing the heating component 100 into the second heating module 110 arranged above the conveying component 400 and the third heating module 120 arranged below the conveying component 400, the heating operation can be performed separately on the front and back of the battery cell 500, thereby avoiding overheating of one side of the battery cell 500 relative to the other side, and ensuring that the two sides of the battery cell 500 are heated evenly.

[0030] In one embodiment, the temperature range of the first heating module 220 is 0 to 500 degrees Celsius, the temperature range of the second heating module 110 is 0 to 1000 degrees Celsius, and the temperature range of the third heating module 120 is 0 to 1100 degrees Celsius. Thus, when only the back surface of the battery cell 500 has an aluminum oxide film layer, the heating temperature of the third heating module 120 in the heating assembly 100 is approximately 100°C higher than the heating temperature of the second heating module 110. This prevents the aluminum oxide film layer on the battery cell 500 from undergoing secondary sintering due to the high temperature when the battery cell 500 passes through the heating assembly 100. Because the H atoms in the passivation film of the battery cell 500 have been activated by the heating component 100, the main function of the illumination component 200 is to provide energy to help the activated hydrogen atoms to ionize, rather than to provide high temperature to activate the hydrogen atoms. Therefore, the temperature required in the illumination component 200 is lower than the temperature required in the heating component 100. The first heating module 220 of the illumination component 200 can stabilize the temperature on the back of the battery cell 500. In this way, the activated H atoms and defects can be prevented from being deactivated due to the excessively low temperature in the illumination component 200, thereby increasing the ratio of ionized hydrogen atoms combined with defect centers and improving the passivation effect of the battery cell 500.

[0031] Furthermore, there can be multiple first heating modules 220, second heating modules 110, and third heating modules 120. For example, there are eight first heating modules 220, six second heating modules 110, and six third heating modules 120. Each first heating module 220 includes one heating lamp 221 with a power of 1500W, and each second heating module 110 and third heating module 120 includes eight heating lamps 221 with a power of 1500W. It is understood that the number of heating modules, the number of heating lamps 221 in a heating module, and the power of the heating lamps 221 can all be adjusted according to usage requirements, thereby enabling the light injection device in this embodiment to adapt to a wider range of user needs.

[0032] In one embodiment, the illumination module 210 includes an illumination box 211, and LED lamp beads are provided inside the illumination box 211. The current range of the illumination box 211 is 0 to 5 amps. Schematically, the illumination module 210 in this embodiment has 8 illumination boxes 211, and each illumination box 211 has 3 LED energy-saving light-emitting groups. Each LED energy-saving light-emitting group is composed of a number of LED lamp beads. The power of each LED energy-saving light-emitting group is 1100W, and the light-emitting power is set by the size of the current. It can be understood that the number of the illumination module 210, the illumination box 211, the LED energy-saving light-emitting group, and the LED lamp beads can all be set according to the use requirements, and the current size of the illumination box 211 and the power size of the LED energy-saving light-emitting group can also be customized and adjusted, so that the light injection device in this embodiment can adapt to a wider range of user needs.

[0033] In one embodiment, the illumination assembly 200 further includes a first cooling structure 230 and a second cooling structure. The first cooling structure 230 is connected to the illumination module 210 for cooling the illumination module 210, and the second cooling structure is provided on one side of the first heating module 220 for cooling the first heating module 220. In this way, the first cooling structure 230 can take away excess heat generated by the illumination module 210 to stabilize the temperature that the illumination module 210 can generate, and the second cooling structure can take away part of the heat generated by the first heating module 220 to prevent the temperature provided by the first heating module 220 from being too high, thereby providing a stable reaction temperature and reaction environment for the ionization of hydrogen atoms in the battery cell 500 and the combination with defects. It can be understood that this embodiment can use different cooling media and cooling methods. Taking the use of cooling water and cooling water pipes to cool the first heating module 220 as an example, the cooling water pipes surround any position of the first heating module 220. When the cooling water flows in the cooling water pipes, the first heating module 220 can be cooled by heat exchange.

[0034] In one embodiment, the heating component 100 further includes a third cooling structure 130 and a fourth cooling structure. The third cooling structure 130 is connected to the second heating module 110 to cool the second heating module 110. The fourth cooling structure is provided on one side of the third heating module 120 to cool the third heating module 120. It can be understood that in this embodiment, the temperature in the heating component 100 is controlled by first setting the number of the second heating modules 110, the number of the third heating modules 120, the number of the heating lamps 221 in the heating modules, and the power of the heating lamps 221. Secondly, the third cooling structure 130 is used to cool the second heating module 110, and the fourth cooling structure is used to cool the third heating module 120. This prevents the temperature in the heating component 100 from being too high. In addition, when the heating component 100 activates the hydrogen atoms in the silicon nitride film of the solar cell 500, it needs to first quickly increase the temperature and then gradually decrease the temperature. Compared with the embodiment without the third cooling structure 130 and the fourth cooling structure, this embodiment can control the cooling process through the third cooling structure 130 and the fourth cooling structure, thereby more conducive to the activation of hydrogen atoms. It is understandable that this embodiment can also use different cooling media and cooling methods.

[0035] In one embodiment, the first cooling structure 230 and the third cooling structure 130 both use gas as the cooling medium, and the second cooling structure and the fourth cooling structure both use liquid as the cooling medium; further, the first cooling structure 230 includes a first cooling pipe 231 and a first fan 232, the second cooling structure includes a second cooling pipe, the third cooling structure 130 includes a third cooling pipe 131 and a second fan 132, and the fourth cooling structure includes a fourth cooling pipe.

[0036] It can be understood that, taking the illumination module 210 of the illumination assembly 200 as an example, when the illumination module 210 generates heat, the heat is transferred to the surface of the solar cells 500 by transferring the heat to the air, thereby heating the solar cells 500. The heated air, due to its lower density than the unheated air, moves upward. In this embodiment, the first cooling pipe 231 and the first fan 232 in the first cooling structure 230 are used to extract the upwardly moving hot air away from the illumination module 210. In this way, the first fan 232 extracts the rising hot air, preventing the hot air from accumulating above the illumination module 210. This makes the cooling method using fans more efficient than other cooling methods and prevents the furnace body 10 containing the light injection device from overheating due to the inability to exhaust the hot air. Furthermore, locating the first cooling pipe 231 and the first fan 232 above the illumination module 210 further facilitates the first fan 232 to extract the hot air away from the illumination module 210, thereby achieving higher cooling efficiency. Schematically, the first cooling structure 230 comprises two first cooling pipes 231 connected to a first fan 232 to cool the illumination module 210. The cooling method of the third cooling structure 130 for the second heating module 110 is similar to that of the first cooling structure 230 for the illumination module 210, and will not be repeated here.

[0037] Similarly, taking the first heating module 220 as an example, it can be understood that for the first heating module 220 below the conveying component 400, using a liquid medium as a cooling medium to cool the first heating module 220 can effectively prevent the hot air from having a unified evacuation direction in the lighting component 200, compared to using a gas medium and a fan to cool the first heating module 220. In other words, the fan is set above the conveying component 400, combined with the liquid medium cooling method set below the conveying component 400, which can make the hot air float only upward and the cold air sink only downward, thereby unifying the movement of the air and facilitating improved cooling efficiency. The cooling method of the fourth cooling structure for the third heating module 120 is similar to the cooling method of the second cooling structure for the first heating module 220, and will not be repeated here.

[0038] Furthermore, the second cooling structure is provided in a one-to-one correspondence with the first heating module 220, and the fourth cooling structure is provided in a one-to-one correspondence with the third heating module 120. Referring to the above, the first heating module 220, located below the conveyor assembly 400, does not need to generate excessive heat, while the third heating module 120, located below the conveyor assembly 400, needs to provide a temperature higher than the temperature required by the second heating module 110, located above the conveyor assembly 400. Thus, by providing a one-to-one correspondence between the second cooling structure and the first heating module 220, and a one-to-one correspondence between the fourth cooling structure and the third heating module 120, temperature control can be achieved more effectively and efficiently, thereby facilitating the stability of the aluminum oxide film layer on the back of the battery cell 500.

[0039] Furthermore, a cooling assembly 300 is disposed above the conveying assembly 400 and includes a fifth cooling pipe 301 and a third fan 302. Thus, the third fan 302 removes excess heat through the fifth cooling pipe 301, cooling the heated solar cells 500 and reducing the rate at which passivated defects become reactivated. This also ensures that the temperature within the device containing the light injection device does not become excessively high, thereby preventing the device from malfunctioning due to heat.

[0040] In one embodiment, the light injection device further includes at least four temperature measuring elements, each of which is used to measure the temperature of the illumination module 210, the first heating module 220, the second heating module 110, and the third heating module 120. This allows for precise monitoring of the actual temperatures of the illumination module 210, the first heating module 220, the second heating module 110, and the third heating module 120, preventing the temperatures of the illumination module 210, the first heating module 220, the second heating module 110, and the third heating module 120 from being set. Furthermore, this facilitates automated temperature adjustment by personnel or a device including the light injection device based on the difference between the actual temperature and the set temperature.

[0041] In one embodiment, the conveyor assembly 400 is a mesh belt, roller, conveyor roller, or belt. It is understood that when the conveyor assembly 400 is a roller or conveyor roller, the diameter of the roller or conveyor roller is smaller than the length of the battery cell 500. This ensures that the battery cell 500 moves along the conveying plane without falling into adjacent rollers or conveyor rollers. It should be noted that the length direction of the battery cell 500 is the direction of movement of the conveyor assembly 400.

[0042] In one embodiment, the light injection device further comprises a furnace body 10, which is provided with a heating cavity, an illumination cavity, and a cooling cavity. The heating component 100 is disposed in the heating cavity, the illumination component 200 is disposed in the illumination cavity, and the cooling component 300 is disposed in the cooling cavity. This allows the heating component 100, the illumination component 200, and the cooling component 300 to be separated, preventing interference between the heating component 100, the illumination component 200, and the cooling component 300, thereby ensuring the orderly progress of the hydrogen atom activation, ionization, and defect bonding reactions, thereby improving the passivation effect of the cell 500.

[0043] Furthermore, the illumination cavity includes an illumination module cavity and a first heating cavity. The illumination module cavity is used to accommodate the illumination module 210, and the first heating cavity is used to accommodate the first heating module 220. The heating cavity includes a second heating cavity and a third heating cavity. The second heating cavity is used to accommodate the second heating module 110, and the third heating cavity is used to accommodate the third heating module 120. In this way, the illumination module 210, the first heating module 220, the second heating module 110, and the third heating module 120 can be further separated, further avoiding mutual interference between the illumination module 210, the first heating module 220, the second heating module 110, and the third heating module 120.

[0044] Hereinafter, the application of the light injection device will be further described through specific embodiments and comparative examples, and the performance of the obtained cell 500 will be measured.

[0045] In the following examples and comparative examples, all raw materials can be purchased commercially, and in order to maintain the reliability of the experiments, the raw materials used in the following examples and comparative examples have the same physical and chemical parameters or are prepared by the same processing method.

[0046] The heating assembly 100 of the light injection device in each embodiment and comparative example includes six second heating modules 110 and six third heating modules 120 arranged sequentially along the direction of motion of the conveyor assembly 400. Therefore, the heating assembly 100 has six temperature zones, which are labeled Temperature Zone 1, Temperature Zone 2, Temperature Zone 3, Temperature Zone 4, Temperature Zone 5, and Temperature Zone 6 along the direction of motion of the conveyor assembly 400. Each second heating module 110 and third heating module 120 each includes eight 1500W heating lamps 221.

[0047] The illumination module 210 of the light injection device in each embodiment and comparative example has 8 illumination boxes 211 arranged in sequence along the movement direction of the conveying component 400, each illumination box 211 has 3 LED energy-saving light-emitting groups arranged in sequence along the movement direction of the conveying component 400, and the illumination component 200 also has 8 first heating modules 220 arranged in sequence along the movement direction of the conveying component 400, and each first heating module 220 has 3 heating lamps with a power of 1500W.

[0048] Example 1:

[0049] In this embodiment, the temperature settings for the second heating module 110 and the third heating module 120 are as shown in Table 1. The temperature of the second heating module 110 increases from 650°C to 700°C and then decreases to 600°C, while the temperature of the third heating module 120 increases from 750°C to 800°C and then decreases to 700°C. The current of the illumination module 210 of the illumination assembly 200 is 5A, and the temperature of the first heating module 220 is 250°C.

[0050] Table 1

[0051] Temperature zone 1 Temperature zone 2 Temperature zone 3 Temperature zone 4 Temperature Zone 5 Temperature zone 6 Second heating module / ℃ 650 700 700 650 620 600 The third heating module / ℃ 750 800 800 750 720 700

[0052] Example 2:

[0053] In this embodiment, the temperature settings for the second heating module 110 and the third heating module 120 are shown in Table 2. The temperature of the second heating module 110 increases from 600°C to 650°C and then decreases to 550°C. The temperature of the third heating module 120 increases from 700°C to 750°C and then decreases to 650°C. The current of the illumination module 210 is 3A, and the temperature of the first heating module 220 is 220°C.

[0054] Table 2

[0055] Temperature zone 1 Temperature zone 2 Temperature zone 3 Temperature zone 4 Temperature Zone 5 Temperature zone 6 Second heating module / ℃ 600 650 650 600 570 550 The third heating module / ℃ 700 750 750 700 670 650

[0056] Example 3:

[0057] In this embodiment, the temperature settings for the second heating module 110 and the third heating module 120 are shown in Table 3. The temperature of the second heating module 110 increases from 550°C to 600°C and then decreases to 500°C. The temperature of the third heating module 120 increases from 650°C to 700°C and then decreases to 600°C. The current of the illumination module 210 is 2A, and the temperature of the first heating module 220 is 200°C.

[0058] Table 3

[0059] Temperature zone 1 Temperature zone 2 Temperature zone 3 Temperature zone 4 Temperature Zone 5 Temperature zone 6 Second heating module / ℃ 550 600 600 550 520 500 The third heating module / ℃ 650 700 700 650 620 600

[0060] Example 4:

[0061] In this embodiment, the temperature settings for the second heating module 110 and the third heating module 120 are shown in Table 4. The temperature of the second heating module 110 increases from 500°C to 500°C and then decreases to 450°C. The temperature of the third heating module 120 increases from 600°C to 650°C and then decreases to 550°C. The current of the illumination module 210 is 1A, and the temperature of the first heating module 220 is 180°C.

[0062] Table 4

[0063] Temperature zone 1 Temperature zone 2 Temperature zone 3 Temperature zone 4 Temperature Zone 5 Temperature Zone 6 Second heating module / ℃ 500 550 550 500 470 450 The third heating module / ℃ 600 650 650 600 570 50

[0064] The electrical properties, light induced degradation (LID), and current induced degradation (CID) of the embodiments and comparative examples are shown in Table 5.

[0065] It should be noted that efficiency (Eta) refers to the ratio of solar energy converted into electrical energy by a cell. The higher the ratio, the higher the efficiency of the cell. Open circuit voltage (Uoc), short circuit current (Isc) and fill factor (FF) are also important factors affecting cell efficiency.

[0066] The open circuit voltage (Uoc) refers to the voltage of the battery when it is not connected to any load. The higher the Uoc of the battery, the stronger the voltage output capability of the battery, which also means the higher the efficiency of the battery.

[0067] Short-circuit current (Isc) refers to the current when a zero-impedance load is connected to the battery cell circuit. The larger the Isc of the battery cell, the stronger the output current capability of the battery cell, which also means that the efficiency of the battery cell is higher.

[0068] Fill factor (FF) refers to the ratio of the maximum product of a cell's output voltage and output current to the product of its open-circuit voltage and short-circuit current. A higher FF indicates that the cell is able to more fully convert light energy into electricity, which also means higher cell efficiency. Therefore, increasing or improving Uoc, Isc, and FF can improve cell efficiency, which can also be evaluated and predicted using these factors.

[0069] Table 5

[0070]

[0071] From the above experimental data, it can be seen that the conversion efficiency of the TOPCon cell 500 obtained using the light injection device in this application is increased by 0.08% to 0.2%, the LID is reduced by 0.05% to 0.22%, and the CID is reduced by 0.02% to 0.17%.

[0072] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A light injection device for injecting light into a cell, characterized in that: It includes a conveying component and a heating component, a lighting component, and a cooling component arranged in sequence. The conveying assembly is used to transport the battery cell so that the battery cell passes through the heating assembly, the lighting assembly, and the cooling assembly in sequence. The heating component is used to heat the battery cell; The illumination assembly includes an illumination module and a first heating module. The illumination module is disposed above the conveying assembly to illuminate the battery cell from above. The first heating module is disposed below the conveying assembly to heat the battery cell on the conveying assembly. The cooling component is used to cool the battery cell after passing through the illumination component.

2. The light injection device according to claim 1, characterized in that The heating component includes a second heating module and a third heating module. The second heating module is arranged above the conveying component, and the third heating module is arranged below the conveying component.

3. The light injection device according to claim 2, characterized in that The temperature range of the first heating module is 0 to 500 degrees Celsius, the temperature range of the second heating module is 0 to 1000 degrees Celsius, and the temperature range of the third heating module is 0 to 1100 degrees Celsius.

4. The light injection device according to claim 1, characterized in that The illumination module includes an illumination box, wherein LED lamp beads are arranged inside the illumination box, and the current range of the illumination box is 0 to 5 amps.

5. The light injection device according to claim 2, characterized in that The illumination assembly further includes a first cooling structure and a second cooling structure, wherein the first cooling structure is connected to the illumination module, and the second cooling structure is provided on one side of the first heating module; The heating component further includes a third cooling structure and a fourth cooling structure. The third cooling structure is connected to the second heating module, and the fourth cooling structure is arranged on one side of the third heating module.

6. The light injection device according to claim 5, characterized in that The first cooling structure and the third cooling structure both use gas as the cooling medium, and the second cooling structure and the fourth cooling structure both use liquid as the cooling medium; The first cooling structure includes a first cooling pipe and a first fan, the first cooling structure includes a second cooling pipe, the third cooling structure includes a third cooling pipe and a second fan, and the fourth cooling structure includes a fourth cooling pipe. The second cooling structure is arranged in a one-to-one correspondence with the first heating module, and the fourth cooling structure is arranged in a one-to-one correspondence with the third heating module.

7. The light injection device according to claim 6, characterized in that It also includes at least four temperature measuring components, which are used to measure the temperatures of the illumination module, the first heating module, the second heating module and the third heating module respectively.

8. The light injection device according to claim 1, characterized in that The cooling component is arranged above the conveying component, and the cooling component includes a fifth cooling pipe and a third fan.

9. The light injection device according to claim 1, characterized in that The conveying component is a mesh belt, a roller, a conveying roller or a belt.

10. The light injection device according to any one of claims 1 to 9, characterized in that: The light injection device further comprises a furnace body, wherein a heating cavity, an illumination cavity and a cooling cavity are provided in the furnace body. The heating component is arranged in the heating cavity, the lighting component is arranged in the lighting cavity, and the cooling component is arranged in the cooling cavity.

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