Gas flow guide device of TOPCon battery chain type cleaning equipment

Abstract

The utility model relates to a gas flow guide device of TOPCon battery chain type cleaning equipment, and belongs to the technical field of gas flow guide. The problems that in the TOPCon battery piece preparation process, HF gas cannot be exhausted in time through tank washing equipment adopting a constant-speed air draft device, so that HF is accumulated in the space, and the battery yield is affected are solved. The device comprises a flow guide assembly and an air draft device, the flow guide assembly comprises a groove cover; the air draft device is mounted in an inner cavity of the cleaning equipment; the tank cover is mounted in an inner cavity of the cleaning equipment and divides the inner cavity into mutually isolated chambers, the chamber where the volatile gas generation source is located is defined as a volatilization area, and the remaining chambers are defined as diffusion areas; diffusion holes are formed in the tank cover, and volatile gas diffuses from the volatilization area to the diffusion area; the hole diameter of the diffusion hole corresponding to the air draft device on the tank cover is larger than that of the diffusion hole far away from the air draft device, and gas forms airflow flowing towards the direction of the air draft device in the volatilization area and the diffusion area, so that the HF gas can be stably discharged.

Description

Technical Field

[0001] The present application relates to a gas diversion device for TOPCon battery chain cleaning equipment, belonging to the technical field of gas diversion equipment. Background Art

[0002] TOPCon cell, full name Tunnel Oxide Passivated Contact solar cell technology, is an N-type silicon substrate cell. The technical feature of TOPCon cell is to prepare an ultra-thin layer of silicon oxide on the back of the cell, and then deposit a thin layer of doped silicon. These two layers together form a passivated contact structure, which effectively reduces surface recombination and metal contact recombination, thereby improving the conversion efficiency of solar cells.

[0003] At present, the removal of BSG / PSG layer in the TOPCon cell preparation process is mainly achieved through chain cleaning equipment. Among them, HF (hydrofluoric acid) is a commonly used cleaning agent, which is mainly used to remove the BSG / PSG layer of TOPCon cells. HF has a very strong hygroscopicity at room temperature and pressure, and produces white smoke when it comes into contact with air. If it is not discharged in time, it will have the following effects: (1) HF molecules are adsorbed on the observation window and groove wall of the chain cleaning equipment, and react with impurities on its surface or impurity molecules in the air, thereby polluting the etching groove and affecting the operator's observation of the operation in the groove. (2) HF affects the air tightness in the groove: on the one hand, the air circulation inside and outside the chain equipment is blocked, causing HF leakage; on the other hand, the cell will accumulate due to HF during the chain transmission process, and the transportation force system of the cell will change, which will change the stability of the water film on the surface of the cell and the contact area between the etching liquid and the cell, resulting in incomplete removal of the BSG / PSG layer on the edge and back of the cell, thereby affecting the subsequent process and causing a decrease in the cell yield and conversion rate.

[0004] In the prior art, in order to exhaust HF gas, an exhaust device is designed in the chain-type double independent tank structure and the chain-type wet cleaning equipment with patent number CN219303613U to extract and remove HF gas. However, the exhaust wind speed of this exhaust device is set at a constant speed, and it is impossible to adjust the exhaust speed of HF corrosive gas in time, which leads to the accumulation of HF in the space over time, which still affects the removal effect of the BSG / PSG layer of the battery cell. At the same time, there is still a large space on the upper part of the tank body that cannot be fully utilized. Therefore, a gas diversion device is urgently needed to solve the problem that in the TOPCon battery cell preparation process, the tank washing equipment using a constant speed exhaust device cannot adjust the exhaust speed of HF gas in time, resulting in the accumulation of HF in the space, affecting the battery yield. Utility Model Content

[0005] In view of the problems and deficiencies in the prior art, the present application provides a gas diversion device for a TOPCon battery chain cleaning device, in which a slot cover is arranged inside the chain cleaning device to separate the internal cavity into an upper diffusion zone and a lower volatilization zone where the battery transmission mechanism is located, and by arranging diffusion holes on the slot cover whose aperture size decreases in a gradient as the distance from the exhaust device changes, the HF gas inside the chain cleaning device can be stably discharged in the air pressure difference formed between the upper and lower parts of the slot cover, and the position close to and far from the exhaust device. The frequency of shutdown for cleaning is greatly reduced, and the impact on the quality and output of the battery cells is also reduced, while avoiding accidents caused by HF leakage.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a gas flow guide device of a TOPCon battery chain cleaning device, comprising a flow guide component and an exhaust device; the flow guide component comprises a slot cover; the exhaust device is installed in the internal cavity of the cleaning device, and is used to exhaust and guide out the volatile gas; the slot cover is installed in the internal cavity of the cleaning device, dividing the internal cavity into mutually isolated chambers, and the chamber where the volatile gas generating source is located is defined as a volatilization zone, and the remaining chambers are defined as a diffusion zone; a diffusion hole is opened on the slot cover, and is used to diffuse the volatile gas from the volatilization zone to the diffusion zone; the aperture of the diffusion hole at the position corresponding to the exhaust device on the slot cover is larger than the aperture of the diffusion hole at a position far away from the exhaust device, so that under the exhaust action of the exhaust device, the gas in the volatilization zone and the diffusion zone forms an airflow flowing toward the exhaust device.

[0007] Specifically, the slot cover is installed on the upper side of the battery transmission mechanism of the chain cleaning equipment, and the cleaning slot of the battery transmission mechanism constitutes a volatile gas generation source; the slot cover divides the internal cavity of the cleaning equipment into upper and lower chambers, and the chamber located on the battery transmission mechanism side is defined as a volatilization zone, and the chamber away from the battery transmission mechanism is defined as a diffusion zone. Since the battery cells are placed on the battery transmission mechanism and HF is used to remove the BSG / PSG layer for cleaning while being transmitted, the slot cover is set on the upper side of the battery transmission mechanism to form upper and lower chambers. The HF gas source is located in the lower layer, which is defined as the volatilization zone, and the upper layer is defined as the diffusion zone. By setting diffusion holes on the slot cover, the HF gas in the lower layer can be diffused from the diffusion holes to the diffusion zone in the upper layer to alleviate the accumulation of HF gas in the volatilization zone.

[0008] Specifically, the exhaust device is installed in the inner cavity of the tank washing device on the side of the battery transmission mechanism, and the exhaust area of ​​the exhaust device runs through the volatilization zone and the diffusion zone. This arrangement enables the exhaust device to extract HF gas in the volatilization zone and the diffusion zone at the same time, thereby ensuring that the HF in the inner cavity of the chain cleaning device can be completely extracted and discharged, avoiding the accumulation of HF gas.

[0009] Specifically, the exhaust device is a vertical exhaust fan, which is fixedly installed radially in the internal cavity of the trough washing equipment and is provided with a plurality of exhaust blades.

[0010] Specifically, there are several slot covers and exhaust devices, and several slot covers are laid on the upper side of the battery transmission mechanism in sequence in the transmission direction of the battery transmission mechanism; and several exhaust devices are installed one by one at one end of the slot cover. This arrangement enables the exhaust devices to be laid along the transmission direction of the battery transmission mechanism, so that the exhaust devices can evenly extract HF gas from different parts, thereby improving the extraction effect.

[0011] Specifically, a plurality of groups of diffusion holes are provided on the slot cover in parallel with the exhaust device; each group of diffusion holes includes a plurality of rows of diffusion holes which are parallel to each other and have the same aperture. This arrangement is to achieve that the HF gas in the volatilization zone diffuses less toward the diffusion zone due to the active exhaust action of the exhaust device at a position close to the exhaust device, while the HF gas at a position far from the exhaust device diffuses more toward the diffusion zone, so that the HF gas in the volatilization zone and the diffusion zone forms a passive gas flow direction along the slot cover toward the exhaust device under the action of the exhaust device.

[0012] Specifically, the apertures of several groups of diffusion holes are set to decrease in a gradient with the length from the exhaust device, wherein the aperture of the diffusion hole close to the exhaust device is the largest, and the aperture of the diffusion hole far from the exhaust device is the smallest. This setting allows the HF gas to diffuse toward the diffusion zone along the slot cover, which can alleviate the accumulation of HF in the volatilization zone. On the other hand, the HF accumulated under the slot cover can diffuse toward the diffusion zone at different slot cover areas at different positions from the exhaust device, thereby achieving different pressure differences of HF gas at different slot cover positions, thereby forming an airflow in the diffusion zone that allows the gas to flow autonomously toward the exhaust device. By the same principle, the HF gas diffused into the diffusion zone also generates different pressure differences at different positions of the slot cover, thereby forming an airflow that allows the gas to flow autonomously toward the exhaust device. It is ensured that the HF gas can flow autonomously and passively toward the exhaust device in both the volatilization zone and the diffusion zone, so that the HF gas can be discharged in time, reducing the accumulation of HF gas.

[0013] Specifically, the slot cover is installed on the upper side of the battery transmission mechanism at an inclined angle relative to the battery transmission mechanism.

[0014] Specifically, the radial height of the slot cover on one side of the exhaust device is higher than the radial height of the side away from the exhaust device. This arrangement can extend the path of the HF gas in the volatilization zone to diffuse along the slot cover toward the diffusion zone or flow toward the exhaust device, and the inclined installation of the slot cover can guide the HF gas to a certain extent to avoid the adsorption and accumulation of the HF gas at the bottom of the slot cover.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] The present application sets a slot cover on the upper side of the battery transmission mechanism of the chain cleaning equipment to separate the internal cavity of the cleaning equipment into two layers of upper and lower chambers, and at the same time, a diffusion hole is opened on the slot cover, and the aperture size of the diffusion hole is arranged in a gradient with the distance from the exhaust device, so that the gas inside the chain cleaning equipment can be stably discharged in the air pressure difference formed by the upper and lower parts of the slot cover, close to and far from the exhaust device. Without adding other devices, the present application increases the fluidity of HF in the chain cleaning equipment, effectively prolongs the cleaning time of the equipment, reduces the impact on the production line, further reduces the risk of HF leakage, and makes the operation of operators safer. At the same time, the design of the holes increases the convenience of operators to observe the inside of the slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the TOPCon battery chain cleaning equipment of this embodiment;

[0018] Figure 2 is a schematic structural diagram of the slot cover of this embodiment;

[0019] Figure 3 Schematic diagram of gas flow in the TOPCon battery chain cleaning equipment of this embodiment. DETAILED DESCRIPTION

[0020] The present application will be further described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0021] See also Figure 1-Figure 3 An embodiment of the present application discloses a gas flow guide device for a TOPCon battery chain cleaning device, including a flow guide component and an exhaust device; the flow guide component includes a slot cover 2; the exhaust device is installed in the internal cavity of the cleaning device, and is used to exhaust and guide out the volatile gas; the slot cover is installed in the internal cavity of the cleaning device, and the internal cavity is divided into mutually isolated chambers, and the chamber where the volatile gas source is located is defined as a volatilization zone, and the remaining chambers are defined as diffusion zones. The volatile gas in this embodiment is HF, and the battery cells 4 are placed in the HF cleaning tank of the chain cleaning device. The battery cells are transported by a battery transmission mechanism, and the battery transmission mechanism consists of a roller conveyor belt composed of a plurality of rollers 5. See. Figure 1 The slot cover 2 is provided with diffusion holes for diffusing the volatile gas from the volatilization zone to the diffusion zone; the aperture of the diffusion hole at the position corresponding to the exhaust device on the slot cover is larger than the aperture of the diffusion hole at the position far from the exhaust device, so that under the exhaust action of the exhaust device, the gas in the volatilization zone and the diffusion zone forms an airflow flowing toward the exhaust device.

[0022] The slot cover of this embodiment is installed on the upper side of the battery transmission mechanism of the chain-type cleaning equipment, and the cleaning slot (not shown) of the battery transmission mechanism constitutes a volatile gas generation source; the slot cover divides the internal cavity of the cleaning equipment into upper and lower chambers, and the chamber located on the battery transmission mechanism side is defined as a volatilization zone, and the chamber away from the battery transmission mechanism is defined as a diffusion zone.

[0023] Furthermore, the exhaust device is installed in the internal cavity of the tank washing device on the side of the battery transmission mechanism, and the exhaust area of ​​the exhaust device runs through the volatilization zone and the diffusion zone. The exhaust device of this embodiment is a vertical exhaust fan 3, which is fixedly installed in the internal cavity of the tank washing device along the radial direction, and is provided with a plurality of exhaust blades. In addition, the number of tank covers and exhaust devices of this embodiment are both several, and the several tank covers are sequentially laid on the upper side of the battery transmission mechanism in the transmission direction 1 of the battery transmission mechanism; the several exhaust devices are installed one by one at the end of one side of the tank cover.

[0024] In this embodiment, the slot cover is provided with four groups of diffusion holes parallel to the exhaust device; each group of diffusion holes includes a plurality of rows of diffusion holes parallel to each other and having the same aperture. The apertures of the four groups of diffusion holes are arranged to decrease gradually with the distance from the exhaust device. The aperture of the group of diffusion holes close to the exhaust device is 4 cm, forming a 4 cm aperture area 9; the apertures of the three groups of diffusion holes gradually away from the exhaust device are 3 cm, 2 cm and 1 cm respectively, forming a 3 cm aperture area 8, a 2 cm aperture area 7 and a 1 cm aperture area 6 respectively. Figure 2 .

[0025] In addition, the slot cover of this embodiment is installed on the upper side of the battery transmission mechanism at an inclined angle relative to the battery transmission mechanism. Specifically, the radial height of the slot cover of this embodiment on the side of the exhaust device is higher than the radial height on the side away from the exhaust device.

[0026] Working principle: When the TOPCon battery chain cleaning equipment of this embodiment is in use, the battery cell is placed on a roller conveyor belt and enters the cleaning tank for BSG / PSG layer cleaning. The HF solution in the cleaning tank generates HF gas due to volatilization. The HF gas diffuses toward the upper layer in the volatilization zone, and the exhaust device located on the side of the cleaning tank extracts the HF gas. As time goes by, when the volatilization rate of the HF gas in the volatilization zone is greater than the exhaust rate of the exhaust device, part of the HF gas in the volatilization zone will not be extracted in time by the exhaust device. The HF gas will diffuse toward the diffusion zone of the upper layer through the diffusion holes on the tank cover. At this time, the amount of HF gas close to the exhaust device diffused to the diffusion zone is small, while the HF gas far away from the exhaust device diffuses more. Small-aperture diffusion holes with a gradient decreasing aperture as the distance from the exhaust device is arranged on the tank cover can, on the one hand, alleviate the accumulation of HF in the space, and on the other hand, can make the HF accumulated in the volatilization zone of the lower layer of the tank cover produce different pressure differences at different positions from the exhaust device, forming gas autonomous flow to the exhaust device. Similarly, gas flow is also formed in the diffusion zone space on the upper layer of the tank cover. Figure 3 . Thus, the HF gas in the volatilization zone and the diffusion zone can be discharged stably. The frequency of shutdown for cleaning is greatly reduced, and the impact on the quality and output of the battery cells is also reduced, while avoiding accidents caused by HF leakage. In addition, the diffusion hole on the slot cover can prevent the HF from adhering to the slot cover and blocking the observation of the inside of the slot.

[0027] The implementation methods of the present application are described in detail above in conjunction with the embodiments, but the present application is not limited to the above-mentioned implementation methods. For ordinary technicians in this technical field, after knowing the contents recorded in the present application, they can make several equivalent changes and substitutions thereto without departing from the principles of the present application, and these equivalent changes and substitutions should also be regarded as belonging to the protection scope of the present application.

Claims

1. A gas flow guide device for a TOPCon battery chain cleaning device, comprising a flow guide component and an exhaust device; characterized in that: The guide component includes a slot cover; the exhaust device is installed in the internal cavity of the cleaning equipment, and is used to exhaust and guide the volatile gas; the slot cover is installed in the internal cavity of the cleaning equipment, and the internal cavity is divided into chambers isolated from each other, and the chamber where the volatile gas generation source is located is defined as a volatilization zone, and the remaining chambers are defined as a diffusion zone; the slot cover is provided with a diffusion hole, which is used to diffuse the volatile gas from the volatilization zone to the diffusion zone; the aperture of the diffusion hole at the position corresponding to the exhaust device on the slot cover is larger than the aperture of the diffusion hole at the position far away from the exhaust device, so that under the exhaust action of the exhaust device, the gas in the volatilization zone and the diffusion zone forms an airflow flowing toward the exhaust device.

2. The gas flow guide device of the TOPCon battery chain cleaning equipment according to claim 1, characterized in that: The slot cover is installed on the upper side of the battery transmission mechanism of the chain cleaning equipment, and the cleaning slot of the battery transmission mechanism constitutes a source of volatile gas; the slot cover divides the internal cavity of the cleaning equipment into upper and lower chambers, and the chamber located on the battery transmission mechanism side is defined as the volatilization zone, and the chamber away from the battery transmission mechanism is defined as the diffusion zone.

3. The gas flow guide device of the TOPCon battery chain cleaning equipment according to claim 2, characterized in that: The exhaust device is installed in the inner cavity of the tank washing device on the side of the battery transmission mechanism, and the exhaust area of ​​the exhaust device runs through the volatilization area and the diffusion area.

4. The gas flow guiding device of the TOPCon battery chain cleaning equipment according to claim 3 is characterized by: The exhaust device is a vertical exhaust fan, which is fixedly installed in the inner cavity of the tank washing equipment along the radial direction and is provided with a plurality of exhaust blades.

5. The gas flow guiding device of the TOPCon battery chain cleaning equipment according to claim 3 is characterized by: The number of the slot covers and the exhaust devices are both several, and the several slot covers are laid in sequence on the upper side of the battery transmission mechanism in the transmission direction of the battery transmission mechanism; and the several exhaust devices are installed one by one at one end of one side of the slot cover.

6. The gas flow guiding device of the TOPCon battery chain cleaning equipment according to claim 5, characterized in that: The slot cover is provided with a plurality of groups of diffusion holes in parallel with the air exhaust device; each group of diffusion holes includes a plurality of rows of diffusion holes which are parallel to each other and have the same aperture.

7. The gas flow guiding device of the TOPCon battery chain cleaning equipment according to claim 6, characterized in that: The apertures of the plurality of groups of diffusion holes are arranged to decrease gradually with the distance from the exhaust device, wherein the diffusion holes close to the exhaust device have the largest apertures and the diffusion holes far from the exhaust device have the smallest apertures.

8. The gas flow guiding device of the TOPCon battery chain cleaning equipment according to claim 5, characterized in that: The slot cover is installed on the upper side of the battery transmission mechanism at an inclined angle relative to the battery transmission mechanism.

9. The gas flow guiding device of the TOPCon battery chain cleaning equipment according to claim 8, characterized in that: The radial height of the slot cover on one side of the air suction device is higher than the radial height of the slot cover on the side away from the air suction device.

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