Waste crystalline silicon photovoltaic module purification auxiliary device

Abstract

The invention relates to a waste crystalline silicon photovoltaic module purification auxiliary device which comprises a box body, the box body comprises a cavity defined by side walls and a bottom wall, a plurality of side face barrier strips are arranged on the opposite side walls in parallel respectively, a plurality of bottom face barrier strips are arranged on the bottom wall in parallel, and the bottom face barrier strips are arranged on the bottom wall in parallel. A battery piece in the waste crystalline silicon photovoltaic module is placed in a space defined by the side face barrier strip, the bottom face barrier strip and the wall face. Compared with the prior art, the purification efficiency of the battery piece in the waste crystalline silicon photovoltaic module is improved, and the completeness of the battery piece is effectively guaranteed in the purification process.

Description

Technical Field

[0001] The invention belongs to the technical field of purification of waste crystalline silicon solar cells and relates to an auxiliary device for purifying waste crystalline silicon photovoltaic modules. Background Art

[0002] With the arrival of the "retirement period" of photovoltaic modules, the recycling and treatment of a large number of crystalline silicon photovoltaic modules needs to be solved urgently. Traditional manual separation and recycling directly crushes the crystalline silicon cells in the module for recycling, resulting in low purity and low utilization rate. Therefore, how to efficiently purify the cells and reuse them has become the focus. Based on this situation, auxiliary devices are required in the efficient purification process of cells.

[0003] Patent CN220439559U discloses a battery cell soaking and cleaning device and a battery cell recycling system, including a soaking and cleaning tank, in which multiple groups of baffles are arranged at intervals along the horizontal direction, and a space for accommodating a single battery cell is formed between two adjacent groups of baffles, and each group of baffles is composed of multiple cylinders arranged at intervals along the vertical direction. However, the cylindrical baffles used in this patent make it easy for the battery cells to touch each other over a large area and overlap and interfere with each other, resulting in inadequate cleaning. Although the bottom wall groove reduces the risk of touching, it makes the preparation of the device complicated. The side walls, end walls and bottom walls need to be prepared using different processes. When the depth of the bottom wall groove is smaller than the size of the battery cell, there is still a risk of the battery cell slipping out of the bottom wall groove during ultrasound. When it is larger, the exposed area of ​​the battery cell is reduced, resulting in inadequate cleaning. Summary of the invention

[0004] The purpose of the present invention is to provide an auxiliary device for purifying waste crystalline silicon photovoltaic modules in order to overcome at least one defect of the above-mentioned prior art. The present invention improves the purification efficiency of the battery cells in the waste crystalline silicon photovoltaic modules and effectively ensures the integrity of the battery cells during the purification process.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] One of the technical solutions of the present invention is to provide an auxiliary device for purifying waste crystalline silicon photovoltaic modules, the device includes a box body, the box body includes a cavity surrounded by side walls and a bottom wall, a plurality of side baffles are arranged in parallel on the opposite side walls, and a plurality of bottom baffles are arranged in parallel on the bottom wall, and the battery cells in the waste crystalline silicon photovoltaic modules are placed in the space surrounded by the side baffles, the bottom baffles and the wall surface.

[0007] Furthermore, the box body includes a rectangular cavity surrounded by four side walls and a bottom wall, and a plurality of first side baffles and second side baffles are respectively and parallelly arranged on a pair of opposite side walls.

[0008] Furthermore, the height of the baffle bars is 16-24 cm. Since there are many sizes of battery cells on the market, if the size is lower than this range, the battery cells are easily touched and the battery cells cannot be completely cleaned. If the size is higher than this range, it is not convenient to take samples during the cleaning process and space resources will be wasted.

[0009] The thickness of the baffles is 0.1-0.3 cm. The baffles are mainly used to separate the battery cells. The thickness of the baffles should not be too large, otherwise it will easily cause a waste of space resources.

[0010] Furthermore, in order to allow the liquid in the box to flow smoothly, the distance between the two sides of the baffle and the two sides of the wall of the box is 1-2 cm. If the size is too large, it will easily cause a waste of space resources.

[0011] There are many types of battery cell thicknesses. In order to ensure that 3-5 battery cells can be placed between each compartment and ensure that they can be cleaned, the distance between the baffles is 0.5-2cm. If the size exceeds this, the battery cells may fit tightly and cannot be cleaned, or the spacing may be loose, which may cause the battery cells to break during the cleaning process.

[0012] Furthermore, in order to allow the liquid in the box to flow smoothly and leave a certain amount of gas space, the distance between the two ends of the baffle and the two ends of the wall of the box is 3-5 cm. If the size is too large, it will easily cause a waste of space resources.

[0013] As a preferred technical solution, the length of the baffles and the length and height of the box are determined by the size of the battery cells, and the number of baffles and the width of the box are determined by the number of battery cells placed.

[0014] Furthermore, a cover is provided on the top of the box body, which covers the top opening of the box body. The cover is opened to place the battery cells and add the acid and alkali solutions required for the cleaning reaction. The cover is closed but not tightly to prevent splashing of liquid during the reaction. At the same time, the gas generated by the reaction in the fume hood is directly discharged by the indoor exhaust system.

[0015] Furthermore, a handle is provided on the side wall of the box body, and the handle assists the carrying device.

[0016] As a preferred technical solution, a fixed shaft is provided on the side wall of the box body, and the handle is fixed to the box body through the fixed shaft and rotates around the fixed shaft.

[0017] Furthermore, a drain port is provided on the bottom wall of the box body, a plug is installed in the drain port, the drain port discharges waste liquid after the reaction, and the plug seals the drain port during the reaction to avoid leakage.

[0018] Furthermore, in order to discharge the waste liquid better and faster, the diameter of the discharge port is 3-5 cm.

[0019] As a preferred technical solution, the thickness of the drain port is the same as the thickness of the bottom wall of the box, the thickness of the plug is slightly smaller than the thickness of the bottom wall of the box, and the bottom baffle is directly installed above the drain port without affecting the setting of the drain port. The plug also does not affect the flatness of the bottom wall of the box when placed in the ultrasound machine.

[0020] As a preferred technical solution, the materials of the components of the device include polytetrafluoroethylene, polypropylene, titanium alloy or stainless steel type 316 that are resistant to strong acids and alkalis.

[0021] Furthermore, the depth of the liquid added for purification is at least enough to submerge half the height of the battery cell, and the liquid surface is at most flush with the top of the side baffle. If it is lower than this depth, the battery cell cannot be completely cleaned, and higher than this depth will easily cause liquid leakage and waste.

[0022] One of the technical solutions of the present invention is to provide a method for purifying waste crystalline silicon photovoltaic modules, which adopts the device to assist in purifying waste crystalline silicon photovoltaic modules, and comprises the following steps:

[0023] The battery cells are placed into the gaps between the baffles in the box, and the first side baffles, the second side baffles and the bottom baffles are used to isolate the placed battery cells;

[0024] Then, the acid and alkali solution required for the cleaning reaction is added into the box;

[0025] Then, the cover is closed but not tightly to prevent splashing of liquid during the reaction. The gas generated by the reaction in the fume hood is directly discharged by the indoor exhaust system, and then placed in the ultrasonic machine through the handle, and the reaction time and ultrasonic frequency are set according to the needs;

[0026] After the reaction is completed, the device is taken out from the ultrasonic machine and the waste liquid is discharged through the drain port.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention uses baffles to effectively separate the cells in the waste crystalline silicon photovoltaic module. The cells obliquely arranged in the spacer between the baffles are separated by the baffles and are not easily touched, thereby increasing the contact area between the acid and alkali solution required for the cleaning reaction and the cells, improving the purification efficiency of the cells, effectively ensuring the integrity of the cells during the purification process, and increasing the reuse rate of the cells, and having the characteristics of high efficiency, simplicity, and large-scale application;

[0029] (2) The present invention has a simple operation process, a moderate size and is easy to carry, a similar box wall style, is easy to produce, and has an adjustable spacing between the stop bars, which is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the auxiliary device for purifying waste crystalline silicon photovoltaic modules in an embodiment of the present invention.

[0031] Description of the markings in the figure:

[0032] 1—cover plate, 2—handle, 3—first side baffle, 4—box body, 5—bottom baffle, 6—liquid discharge port, 7—second side baffle. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, which only refer to different instances of the same object, and are not intended to imply that the objects described in this way must adopt a given order, whether in time, space, order or any other way.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Example:

[0037] A waste crystalline silicon photovoltaic module purification auxiliary device, such as Figure 1As shown, the box body 4 includes a cavity surrounded by side walls and a bottom wall, a plurality of side baffles are arranged in parallel on the opposite side walls, and a plurality of bottom baffles 5 are arranged in parallel on the bottom wall, and the battery cells in the waste crystalline silicon photovoltaic module are placed in the space surrounded by the side baffles, the bottom baffles 5 and the wall surface;

[0038] The box body 4 comprises a rectangular cavity surrounded by four side walls and a bottom wall, and a plurality of first side baffles 3 and second side baffles 7 are respectively and parallelly arranged on a pair of opposite side walls;

[0039] The height of the baffle is 16-24 cm. Since there are many sizes of battery cells on the market, if the size is lower than this range, the battery cells are easily touched and the battery cells cannot be completely cleaned. If the size is higher than this range, it is not convenient to take samples during the cleaning process and space resources will be wasted. In this embodiment, 20 cm is preferred;

[0040] The thickness of the baffles is 0.1-0.3 cm. The baffles are mainly used to separate the battery cells. The thickness of the baffles should not be too large, otherwise it will easily cause a waste of space resources. In this embodiment, it is preferably 0.2 cm;

[0041] In order to make the liquid in the box body 4 flow smoothly, the distance between the two sides of the baffle and the two sides of the wall of the box body 4 is 1-2 cm. If the size is too large, it will easily cause waste of space resources. In this embodiment, it is preferably 1.5 cm;

[0042] There are many types of battery cell thicknesses. In order to ensure that 3-5 battery cells can be placed between each compartment and ensure that they can be cleaned, the distance between the bars is 0.5-2 cm. If the size exceeds this, the battery cells are easily tightly fitted and cannot be cleaned, or the spacing is loose, which may cause the battery cells to break during the cleaning process. In this embodiment, 1 cm is preferred;

[0043] In order to make the liquid in the box body 4 flow smoothly and leave a certain amount of gas space, the distance between the two ends of the baffle and the two ends of the wall of the box body 4 is 3-5 cm. Too large a size will easily cause a waste of space resources. In this embodiment, it is preferably 4 cm;

[0044] The length of the baffles and the length and height of the box 4 are determined by the size of the battery cells, and the number of baffles and the width of the box 4 are determined by the number of battery cells to be placed. In the embodiment, the number of baffles can be set to 6;

[0045] A cover plate 1 is provided on the top of the box body 4, and the cover plate 1 covers the top opening of the box body 4. The cover plate 1 is opened to place the battery cells and add the acid and alkali solutions required for the cleaning reaction. The cover plate 1 is closed but not tightly to prevent the splashing of the liquid during the reaction. At the same time, the gas generated by the reaction in the fume hood is directly discharged by the indoor exhaust system;

[0046] A handle 2 is provided on the side wall of the box body 4, and the handle 2 assists the carrying device;

[0047] A fixed shaft is provided on the side wall of the box body 4, and the handle 2 is fixed to the box body 4 through the fixed shaft and can rotate around the fixed shaft;

[0048] A drain port 6 is provided on the bottom wall of the box body 4, and a plug is installed in the drain port 6. The drain port 6 discharges the waste liquid after the reaction, and the plug seals the drain port 6 during the reaction to prevent leakage.

[0049] In order to discharge the waste liquid better and faster, the diameter of the discharge port 6 is 3-5 cm, preferably 4 cm in this embodiment;

[0050] The thickness of the drain port 6 is the same as the thickness of the bottom wall of the box body 4, and the thickness of the plug is slightly smaller than the thickness of the bottom wall of the box body 4. The bottom baffle 5 is directly mounted above the drain port 6, which does not affect the setting of the drain port 6, and the plug does not affect the flatness of the bottom wall of the box body 4 when placed in the ultrasound machine;

[0051] The components of the device are all made of polytetrafluoroethylene, polypropylene, titanium alloy or stainless steel 316 type materials that are resistant to strong acids and alkalis. In this embodiment, polytetrafluoroethylene is preferred.

[0052] A method for purifying waste crystalline silicon photovoltaic modules, using the above device to assist in purifying waste crystalline silicon photovoltaic modules, the specific steps are as follows:

[0053] When working, the battery cells are placed into the gap between the baffles in the box body 4, and the placed battery cells are isolated under the action of the first side baffle 3, the second side baffle 7 and the bottom baffle 5;

[0054] Then, the acid and alkali solution required for the cleaning reaction is added into the box 4. In this embodiment, a 5M nitric acid solution or a 3M sodium hydroxide alkali solution is selected. The depth of the added solution is at least half the height of the battery cell, and the liquid surface is at most flush with the top of the side baffle. If it is lower than this depth, the battery cell cannot be completely cleaned. If it is higher than this depth, it is easy to cause liquid leakage and waste. In this embodiment, it is preferably two-thirds of the height of the battery cell;

[0055] Then, the cover plate 1 is covered but not tightly to prevent the splashing of the liquid during the reaction. At the same time, the gas generated by the reaction in the fume hood is directly discharged by the indoor exhaust system, and then placed in the ultrasonic machine through the handle 2. The reaction time, ultrasonic frequency, etc. are set according to the needs. In this embodiment, 30 minutes and 40 kHz are preferably used;

[0056] After the reaction is completed, the device is taken out from the ultrasonic machine and the waste liquid is discharged through the drain port 6.

[0057] The silicon wafers obtained after the reaction assisted by the above device were tested by an inductively coupled plasma spectrometer (ICP). 5M nitric acid solution or 3M sodium hydroxide alkaline solution could make the purity of the silicon wafers reach 99% and the recovery rate reach 94%.

[0058] The present invention separates the cells in the waste crystalline silicon photovoltaic module during the cleaning reaction process, thereby effectively improving the purification efficiency of the cells, ensuring the integrity of the cells, and improving the utilization rate of the cells.

[0059] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A waste crystalline silicon photovoltaic module purification auxiliary device, characterized in that: The device comprises a box body (4), the box body (4) comprises a cavity surrounded by side walls and a bottom wall, a plurality of side baffles are respectively arranged in parallel on the opposite side walls, a plurality of bottom baffles (5) are arranged in parallel on the bottom wall, and the battery cells in the waste crystalline silicon photovoltaic module are placed in the space surrounded by the side baffles, the bottom baffles (5) and the wall surface.

2. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 1, characterized in that: The box body (4) comprises a rectangular parallelepiped cavity surrounded by four side walls and a bottom wall, and a plurality of first side baffles (3) and second side baffles (7) are respectively and parallelly arranged on a pair of opposite side walls.

3. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 1, characterized in that: The height of the baffles is 16-24 cm, and the thickness of the baffles is 0.1-0.3 cm.

4. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 1, characterized in that: The distances between the two sides of the baffle and the two sides of the wall of the box body (4) are 1-2 cm, and the distances between the baffles are 0.5-2 cm.

5. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 1, characterized in that: The distances between the two ends of the baffle and the two ends of the wall of the box body (4) are both 3-5 cm.

6. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 1, characterized in that: A cover plate (1) is provided on the top of the box body (4), and the cover plate (1) covers the top opening of the box body (4).

7. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 1, characterized in that: A handle (2) is provided on the side wall of the box body (4).

8. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 1, characterized in that: A liquid discharge port (6) is provided on the bottom wall of the box body (4), and a plug is installed in the liquid discharge port (6).

9. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 8, characterized in that: The diameter of the drainage port (6) is 3-5 cm.

10. The auxiliary device for purifying waste crystalline silicon photovoltaic modules according to claim 1, characterized in that: The depth of the liquid added for purification is at least enough to submerge half the height of the battery cell, and the liquid surface is at most flush with the top of the side baffle.

Images