Light injection device

Abstract

The utility model relates to a light injection device. The light injection device comprises a process chamber, a bearing mechanism, a light injection mechanism and a cooling mechanism. The bearing mechanism is arranged in the process chamber, and the bearing mechanism is used for bearing a battery piece. And the light injection mechanism is arranged in the process chamber and is used for carrying out light injection treatment on the battery pieces of the bearing mechanism. And the cooling mechanism is used for cooling the process chamber. According to the light injection device, the cooling mechanism is arranged to cool the process chamber, for example, the temperature in the process chamber is kept at 190-220 DEG C, damage to the battery piece is reduced, illumination of the light injection mechanism is stable and uniform, the passivation effect of the battery piece is better, the photoelectric conversion efficiency of the battery piece is improved to a certain degree, and the service life of the battery piece is prolonged. And the EL blackening proportion of the battery piece is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a light injection device. Background Art

[0002] The manufacturing of solar cells such as heterojunction cells (HJT cells) includes processes such as cleaning and texturing, microcrystalline silicon thin film deposition, TCO thin film preparation and screen printing.

[0003] After screen printing, the cell is passivated using a light injection process, which uses a light injection mechanism such as an LED module to provide a high amount of light injection to the cell in a short period of time, so that the H-group elements in the amorphous layer of the solar cell are activated, and the valence state of the hydrogen atoms is controlled by light, so that they combine with the recombination center at the P+ emitter and the N-type substrate to form a non-recombination center, which better absorbs the dangling bonds inside the battery and saturates the recombination area, thereby greatly improving the passivation effect, increasing the minority carrier lifetime, and improving the battery conversion efficiency.

[0004] However, in the traditional light injection process, as the process time increases, the passivation effect of the cell deteriorates, which is manifested as the EL image becoming black and dark, seriously affecting the stability and improvement of the solar cell efficiency. Utility Model Content

[0005] Based on this, it is necessary to provide a light injection device to solve the problem of black and dark EL images of the cell.

[0006] A light injection device, comprising:

[0007] Craft Room;

[0008] A carrying mechanism, arranged in the process chamber, and used for carrying the battery sheet;

[0009] A light injection mechanism, disposed in the process chamber, for performing light injection processing on the battery cell of the carrier mechanism; and

[0010] The cooling mechanism is used to cool the process chamber.

[0011] In one embodiment, the cooling mechanism comprises:

[0012] The cold air component includes a cold air chamber, a gas compressor, a cold air pipeline and a return air pipeline. The cold air chamber is arranged in the process chamber. The cold air chamber has an air inlet end and an air outlet end that are relatively arranged. The gas compressor is connected to the air inlet end through the cold air pipeline, and the air outlet end is connected to the gas compressor through the return air pipeline.

[0013] In one of the embodiments, the cold air pipeline includes a plurality of sub-pipelines connected in sequence, and the diameters of the plurality of sub-pipelines increase in sequence from the gas compressor to the cold air chamber.

[0014] In one embodiment, the light injection mechanism is located above the supporting mechanism, and the cold air cavity is located above the light injection mechanism.

[0015] In one embodiment, the cooling component further comprises:

[0016] The confluence cavity is located in the process chamber. The confluence cavity is a cavity with an opening at the lower end. The confluence cavity cover is arranged on the light injection mechanism. The cold air cavity is arranged in the confluence cavity.

[0017] In one of the embodiments, the height of the confluence cavity is 60 cm to 120 cm, and the distance between the bottom end of the cold air cavity and the light injection mechanism is 25 cm to 40 cm.

[0018] In one embodiment, the cooling component further comprises:

[0019] The refrigeration component is arranged on the return air pipeline.

[0020] In one of the embodiments, the process chamber is provided with a feed port and a discharge port which are connected to each other, and the supporting mechanism includes a conveying component extending from the feed port to the discharge port.

[0021] In one embodiment, the cooling mechanism comprises:

[0022] A fan is arranged at the discharge port and is used for blowing air toward the outside of the process chamber.

[0023] In one embodiment, the fan is an ion fan.

[0024] In one embodiment, the blowing direction of the fan is downward, and the angle with the horizontal direction is 25°~50°.

[0025] Compared with the traditional solution, the above light injection device has the following beneficial effects:

[0026] After research, it was found that the process chamber of traditional equipment generates a lot of heat due to continuous illumination, which makes the temperature in the process chamber easily exceed the acceptable temperature of heterojunction low-temperature cells (below 230°C), resulting in poor passivation effect of the cells and dark EL images. In addition, continuous high temperature causes certain damage to the light injection mechanism. The light intensity and uniformity of the light injection mechanism gradually decrease with working time, and the passivation effect of the cells deteriorates and they turn black and dark, which seriously affects the stability and improvement of solar cell efficiency.

[0027] The above-mentioned light injection device includes a process chamber, a supporting mechanism, a light injection mechanism and a cooling mechanism. By setting the cooling mechanism, the process chamber is cooled down, for example, the temperature in the process chamber is maintained at 190°C~220°C, thereby reducing damage to the battery cell, and making the lighting of the light injection mechanism stable and uniform, the battery cell passivation effect is better, the photoelectric conversion efficiency of the battery cell is improved to a certain extent, and the proportion of EL blackening of the battery cell is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic structural diagram of a process chamber and a cooling air component in a light injection device according to an embodiment;

[0029] FIG2 is a schematic structural diagram of a light injection mechanism, a supporting mechanism and a cooling air component in the light injection device shown in FIG1 ;

[0030] FIG3 is a schematic diagram showing the positional relationship between the cold air cavity, the confluence cavity and the light injection mechanism;

[0031] FIG. 4 is a schematic structural diagram of a process chamber and a fan in the light injection device shown in FIG. 1 .

[0032] Description of reference numerals:

[0033] 10. Light injection device; 100. Process chamber; 110. Feed inlet; 120. Feed outlet; 200. Carrying mechanism; 210. Conveying assembly; 300. Light injection mechanism; 400. Cooling mechanism; 410. Cold air assembly; 411. Cold air cavity; 4112. Air inlet; 4114. Air outlet; 412. Gas compressor; 413. Cold air pipeline; 4132. First sub-pipeline; 4134. Second sub-pipeline; 414. Return air pipeline; 415. Converging cavity; 416. Refrigeration component; 420. Fan; 20. Battery cell; 30. Material receiving platform. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The utility model provides a light injection device which can be used in the light injection process of a battery sheet.

[0040] 1 and 2 , a light injection device 10 according to an embodiment of the present invention includes a process chamber 100 , a carrying mechanism 200 , a light injection mechanism 300 , and a temperature reduction mechanism 400 .

[0041] The carrying mechanism 200 is disposed in the process chamber 100 and is used to carry the cell 20. The light injection mechanism 300 is disposed in the process chamber 100 and is used to perform light injection processing on the cell 20 on the carrying mechanism 200. The cooling mechanism 400 is used to cool the process chamber 100.

[0042] The light injection device 10 is provided with a cooling mechanism 400 to cool down the process chamber 100, for example, to maintain the temperature in the process chamber 100 at 190°C~220°C, thereby reducing damage to the battery cell 20 and making the illumination of the light injection mechanism 300 stable and uniform, so that the passivation effect of the battery cell 20 is better, and the photoelectric conversion efficiency of the battery cell 20 is improved to a certain extent, and the proportion of the EL image of the battery cell 20 that is black and dark is effectively reduced.

[0043] In one example, the process chamber 100 is provided with a connected feed port 110 and a discharge port 120. The carrying mechanism 200 includes a conveying assembly 210 extending from the feed port 110 to the discharge port 120. The conveying assembly 210 carries and transports the cell 20 and transports it out of the process chamber 100 after light injection.

[0044] The light injection mechanism 300 irradiates the battery cell 20 on the carrier mechanism 200 with a specific light intensity, for example, 0-80 suns of light. The light injection mechanism 300 can be, but is not limited to, an LED module. The light injection mechanism 300 is preferably disposed above the carrier mechanism 200.

[0045] In one example, the cooling mechanism 400 includes a cold air component 410. The cold air component 410 includes a cold air cavity 411, a gas compressor 412, a cold air pipeline 413 and a return air pipeline 414. The cold air cavity 411 is arranged in the process chamber 100. Further, the light injection mechanism 300 is located above the carrier mechanism 200, and the cold air cavity 411 is located above the light injection mechanism 300. The cold air cavity 411 has an air inlet end 4112 and an air outlet end 4114 arranged opposite to each other. The gas compressor 412 is connected to the air inlet end 4112 through the cold air pipeline 413, and the air outlet end 4114 is connected to the gas compressor 412 through the return air pipeline 414.

[0046] The gas compressor 412 is used to compress gas, such as carbon dioxide, and supply it to the cold air cavity 411. Carbon dioxide is a colorless and odorless gas, light in weight, and has no residue or corrosive effect. Carbon dioxide is compressed into a liquid, and after the pressure is released, carbon dioxide gas is generated to absorb heat and cool the cold air cavity 411. The depressurized gas returns to the gas compressor 412 via the return gas pipeline 414, realizing the circulation of the gas for use and reducing gas waste.

[0047] The heat generated by the light injection mechanism 300 when working heats the surrounding air. The hot air is lighter and is an upward airflow. The cold air cavity 411 located above the light injection mechanism 300 cools the surrounding air. The cold air is heavier and is a downward airflow. The hot and cold air flows exchange heat to cool the light injection mechanism 300, so that the light injection mechanism 300 maintains a good operating state, ensures that its light intensity is continuously stable, and prolongs the life of the light injection mechanism 300.

[0048] As shown in FIG. 1 and FIG. 2 , in one example, the cold air pipeline 413 includes a plurality of sub-pipelines connected in sequence, and the diameters of the plurality of sub-pipelines increase in sequence from the gas compressor 412 to the cold air cavity 411. Liquefied carbon dioxide is released from the gas compressor 412, and passes through a plurality of sub-pipelines connected in sequence. The carbon dioxide gradually releases pressure and changes from liquid to gas by utilizing the diameter change principle, so as to absorb heat and cool the cold air cavity 411 more effectively.

[0049] In the specific example shown in the figure, from the gas compressor 412 to the cold air cavity 411, the cold air pipeline 413 includes a first sub-pipeline 4132 and a second sub-pipeline 4134 that are connected in sequence, and the diameter of the second sub-pipeline 4134 is larger than the first sub-pipeline 4132. The diameter a of the first sub-pipeline 4132 is, for example, 15-20 cm, and the diameter b of the second sub-pipeline 4134 is, for example, 25-30 cm. Liquid carbon dioxide is depressurized and released from the gas compressor 412 to the first sub-pipeline 4132, and carbon dioxide flows from the first sub-pipeline 4132 with a small diameter to the second sub-pipeline 4134 with a large diameter, which can release a certain amount of pressure. Further, the caliber of the cold air cavity 411 is larger than the diameter of the second sub-pipeline 4134, so that the gas pressure is further released when carbon dioxide enters the cold air cavity 411 from the second sub-pipeline 4134, and the cold air cavity 411 is better absorbed and cooled after the pressure is released.

[0050] As shown in FIG3 , in one example, the cold air component 410 further includes a confluence cavity 415. The confluence cavity 415 is a cavity with an opening at the lower end. The confluence cavity 415 is covered on the light injection mechanism 300, and the cold air cavity 411 is arranged in the confluence cavity 415. The cold air cavity 411 is located above the light injection mechanism 300. The heat generated by the light injection mechanism 300 heats the surrounding air. The hot air is light in weight and is an ascending airflow. It passes through the confluence cavity 415 to reach the cavity wall of the cold air cavity 411. After being cooled, the cold air is heavier and is a descending airflow. It sinks to the periphery of the light injection mechanism 300 and cools it, so that the light injection mechanism 300 maintains a good operating state, ensures the stability of the light intensity, and prolongs the life of the light injection mechanism 300.

[0051] In one example, the height of the confluence cavity 415 is 60 cm to 120 cm, specifically 60 cm, 70 cm, 80 cm, 90 cm, 100 cm, 110 cm, 120 cm, etc. The distance between the bottom of the cold air cavity 411 and the light injection mechanism 300 is 25 cm to 40 cm, specifically 25 cm, 28 cm, 30 cm, 32 cm, 35 cm, 38 cm, 40 cm, etc.

[0052] As shown in Fig. 1 and Fig. 2, in one example, the cold air assembly 410 further includes a refrigeration component 416. The refrigeration component 416 is disposed on the return air pipeline 414, and is used to refrigerate the gas flowing out of the cold air cavity 411. The refrigeration component 416 can be a refrigerator.

[0053] The temperature of the gas flowing out of the cold air cavity 411 increases, and at this time, it is first cooled by the refrigeration component 416. For carbon dioxide, because the critical temperature of carbon dioxide is about 31.2°C and the critical pressure is 7.38MPa, it will not liquefy when the temperature is higher than 31.2°C and the pressure is higher; when the temperature is lower than 31.2°C, the liquefaction pressure decreases as the temperature decreases, and the pressure of 6.7MPa is required at 27°C, 5.7MPa at 20°C, and 4.5MPa at 10°C. Therefore, the refrigeration component 416 is used to cool the carbon dioxide gas to 0-5°C, and then the gas compressor 412 is used to pressurize and cool it to convert it into liquid carbon dioxide. In this way, the working intensity of the gas compressor 412 can be reduced and the service life of the gas compressor 412 can be extended.

[0054] As shown in FIG4 , in one example, the cooling mechanism 400 includes a fan 420. The fan 420 is disposed at the discharge port 120 of the process chamber 100, and the fan 420 is used to blow air toward the outside of the process chamber 100. The fan 420 is preferably an ion fan to blow ionized air to eliminate static electricity. The fan 420 is preferably a high temperature resistant ion fan.

[0055] By arranging a fan 420 at the discharge port 120 of the process chamber 100 to blow air toward the outside of the process chamber 100, negative pressure is formed at the discharge port 120, so that hot air in the process chamber 100 flows to the discharge port 120 to supplement the negative pressure, thereby achieving cooling in the process chamber 100.

[0056] In one example, the blowing direction of the fan 420 is downward, and the angle with the horizontal direction is 25°~50°, specifically 25°, 30°, 35°, 40°, 45°, 50°, etc. Through long-term experimental verification, the blowing direction of the fan 420 is set to the above angle, and the air blown away flows to the receiving platform 30 outside the process chamber 100, which can cool down the process chamber 100 and the battery cell 20 on the receiving platform 30, which can effectively solve the problem of the battery cell 20 becoming dark.

[0057] Optionally, the number of the fans 420 is not limited to only one, and may be multiple, for example, 2 to 5. The multiple fans 420 may be linearly arranged at the discharge port 120.

[0058] The above-mentioned cooling device 400, including the cooling air component 410 and the fan 420, can be switched on and off by a controller. For example, by monitoring the internal temperature of the rod process chamber 100, when the internal temperature exceeds the set temperature range (such as 190°C~220°C), the cooling air component 410 and the fan 420 are turned on for cooling. When the internal temperature is lower than the set temperature range, the cooling device 400 is turned off.

[0059] The light injection device 10 including the cooling component 410 and the fan 420 is used to keep the internal temperature of the process chamber 100 at 190°C to 220°C for a long time, and the light of the light injection mechanism 300 is stable and uniform, which improves the passivation effect of the amorphous silicon layer of the battery cell 20, and the open circuit voltage U oc As well as the fill factor FF being improved, the conversion efficiency of the battery cell 20 is improved, and the proportion of the battery cell 20 becoming black and dark is significantly reduced.

[0060] The following provides an application example for a photovoltaic plant.

[0061] From December 2022 to April 2023, the photovoltaic plant used the original light injection device 10, which did not include the above-mentioned cooling assembly 410 and fan 420, to perform light injection treatment on the cell 20. The average photoelectric conversion efficiency of the cell 20 in each month was 24.90%, 24.95%, 24.92%, 24.93% and 24.94%, and the proportion of the EL image of the cell 20 blackening was 3.90%, 3.98%, 2.56%, 4.02% and 3.69%, respectively. Later, the light injection device 10 including the above-mentioned cooling assembly 410 and fan 420 was used to perform light injection treatment on the cell 20. From May 2023 to June 2023, the average photoelectric conversion efficiency of the cell 20 in each month was 25.03% and 25.01%, and the proportion of the EL image of the cell 20 blackening was 0.12% and 0.09%, respectively.

[0062] Therefore, after using the light injection device 10 including the cooling assembly 410 and the fan 420, the photoelectric conversion efficiency of the battery cell 20 is increased by 0.09%. The blackening ratio of the battery cell 20 is reduced from 3.63% to 0.1%, a decrease of 97%, which basically solves the problem of the battery cell 20 becoming black and dark.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0064] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A light injection device (10), characterized in that: include: Craft Room (100); A carrying mechanism (200), arranged in the process chamber (100), the carrying mechanism (200) being used to carry a battery cell (20); A light injection mechanism (300) is arranged in the process chamber (100), and the light injection mechanism (300) is used to perform a light injection process on the battery cell (20) of the carrier mechanism (200); and The cooling mechanism (400) is used to cool the process chamber (100).

2. The light injection device (10) according to claim 1, characterized in that: The temperature reduction mechanism (400) comprises: A cold air component (410) comprises a cold air chamber (411), a gas compressor (412), a cold air pipeline (413) and a return air pipeline (414), wherein the cold air chamber (411) is arranged in the process chamber (100), the cold air chamber (411) has an air inlet end (4112) and an air outlet end (4114) arranged opposite to each other, the gas compressor (412) is connected to the air inlet end (4112) via the cold air pipeline (413), and the air outlet end (4114) is connected to the gas compressor (412) via the return air pipeline (414).

3. The light injection device (10) according to claim 2, characterized in that: The cold air pipeline (413) comprises a plurality of sub-pipelines that are connected in sequence, and the diameters of the plurality of sub-pipelines increase in sequence from the gas compressor (412) to the cold air chamber (411).

4. The light injection device (10) according to claim 2, characterized in that: The cooling component (410) further includes: A refrigeration component (416) is arranged on the return air pipeline (414).

5. The light injection device (10) according to claim 2, characterized in that: The light injection mechanism (300) is located above the supporting mechanism (200), and the cold air cavity (411) is located above the light injection mechanism (300).

6. The light injection device (10) according to claim 5, characterized in that: The cooling component (410) further includes: The confluence cavity (415) is located in the process chamber (100); the confluence cavity (415) is a hollow cavity with an opening at the lower end; the confluence cavity (415) is covered on the light injection mechanism (300); and the cold air cavity (411) is arranged in the confluence cavity (415).

7. The light injection device (10) according to claim 6, characterized in that: The height of the confluence cavity (415) is 60 cm to 120 cm, and the distance between the bottom end of the cold air cavity (411) and the light injection mechanism (300) is 25 cm to 40 cm.

8. The light injection device (10) according to any one of claims 1 to 7, characterized in that: The process chamber (100) is provided with a feed port (110) and a discharge port (120) which are connected to each other, and the supporting mechanism (200) comprises a conveying component (210) extending from the feed port (110) to the discharge port (120).

9. The light injection device (10) according to claim 8, characterized in that: The temperature reduction mechanism (400) comprises: A fan (420) is arranged at the discharge port (120) and is used to blow air toward the outside of the process chamber (100).

10. The light injection device (10) according to claim 9, characterized in that: The fan (420) is an ion fan (420); and / or The blowing direction of the fan (420) is downward, and the angle between the fan and the horizontal direction is 25° to 50°.

Images