Acetic acid corrosion test box

Abstract

The utility model relates to the technical field of acetic acid corrosion tests, in particular to an acetic acid corrosion test box. The acetic acid corrosion test box comprises an outer box body, the outer box body is of a closed structure, and the bottom of the outer box body is used for containing reaction liquid; the inner box body is arranged in the outer box body, and adjusting channels are distributed on the inner box body; and the flower basket mechanism is positioned in the inner box body and is used for mounting the battery pieces. According to the embodiment of the invention, the acetic acid gas entering the inner box body is controlled through the distribution and size of the adjusting channels on the inner box body, and the concentration distribution of the acetic acid gas in the inner box body is regulated and controlled, so that the concentration of the acetic acid gas at each part of the battery piece is regulated and controlled; and the problem of overhigh local concentration caused by natural flowing of acetic acid gas generated in the outer box body is avoided.

Description

Technical Field

[0001] This application relates to the field of acetic acid corrosion testing technology, and in particular to an acetic acid corrosion testing chamber. Background Technology

[0002] Photovoltaic modules typically encapsulate crystalline silicon cells using ethylene-vinyl acetate copolymer (EVA) films. However, when used outdoors, the EVA film undergoes a chemical reaction under light and heat, generating acetic acid and olefins. The electrodes of crystalline silicon cells are printed using a paste primarily composed of silver and aluminum. Acetic acid corrodes the cell electrodes, and the resulting compounds increase electrode resistance, leading to a decrease in the fill factor of the crystalline silicon cell and consequently reducing cell efficiency. Therefore, acetic acid corrosion testing is necessary for crystalline silicon cells.

[0003] Currently, the acetic acid testing apparatus used is a quartz basket. The solar cells are placed in the basket, and acetic acid is heated and evaporated to produce acetic acid gas, which corrodes the solar cells. The electrical performance and electroluminescence (EL) of the solar cells are then tested to evaluate the acetic acid degradation rate. However, during the test, the flow direction of the acetic acid gas is uncontrollable, and the uneven distribution of the acetic acid gas affects the accuracy of the acetic acid corrosion test.

[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content

[0005] This application provides an acetic acid corrosion test chamber to solve or alleviate one or more of the technical problems mentioned above.

[0006] This application provides an acetic acid corrosion test chamber.

[0007] This acetic acid corrosion test chamber includes:

[0008] The outer casing is a closed structure, and the bottom of the outer casing is used to place the reaction liquid;

[0009] An inner box is placed inside the outer box, and adjustment channels are distributed on the inner box;

[0010] The flower basket mechanism is located inside the inner box and is used to install battery cells.

[0011] In this embodiment, the distribution and size of the adjustment channels on the inner casing control the acetic acid gas entering the inner casing, thereby regulating the concentration distribution of acetic acid gas in the inner casing and thus regulating the concentration of acetic acid gas in various parts of the battery cell. This avoids the problem of excessive local concentration caused by the natural flow of acetic acid gas generated in the outer casing.

[0012] Optionally, the cross-section of the adjustment channel is circular. This facilitates molding.

[0013] Optionally, the adjustment channels are evenly distributed on the inner housing. This facilitates molding.

[0014] Optionally, the diameter of the regulating channel is 0.5cm to 0.75cm. Therefore, using a small-diameter regulating channel as a diffusion channel for acetic acid gas allows for the uniform distribution of acetic acid gas within the inner casing, ensuring uniform contact between the gas and the battery cells.

[0015] Optionally, when the inner chamber has a cuboid shape, it includes a first side panel, a second side panel, a third side panel, a fourth side panel, a fifth side panel, and a sixth side panel. The adjustment channels on each side panel independently satisfy the condition that the total area of ​​the adjustment channels occupies 10% to 17% of the area of ​​the side panel in which they are located. This allows for the control of the proportion of the total area of ​​the adjustment channels on each side panel to regulate the amount of acetic acid gas entering the inner chamber.

[0016] Optionally, the first side plate is a top plate, and the total area of ​​the adjustment channels on the first side plate accounts for 10% to 12% of the area of ​​the first side plate; the sixth side plate is a bottom plate, and the total area of ​​the adjustment channels on the sixth side plate accounts for 10% to 12% of the area of ​​the sixth side plate. Thus, the sixth side plate near the acetic acid gas source and the first side plate away from the acetic acid gas source both have relatively few adjustment channels, reducing the amount of acetic acid gas directly entering both ends of the battery cell, thereby reducing the accumulation of acetic acid gas at both ends, and ultimately reducing the over-corrosion of the battery cell ends by acetic acid.

[0017] Optionally, the second, third, fourth, and fifth side plates each independently satisfy the following condition: the total area of ​​the adjustment channels on each side plate accounts for 15% to 17% of the area of ​​that side plate, and the area ratio of the adjustment channels continuously decreases from the middle position of each side plate to both ends. This increases the amount of acetic acid gas entering the inner chamber through the middle of the side plate, thereby increasing the concentration of acetic acid gas in areas with low acetic acid concentration.

[0018] Optionally, a reaction liquid tank is provided at the bottom of the outer casing, and the top of the reaction liquid tank is 10cm to 12cm away from the sixth side plate. Maintaining this distance between the sixth side plate and the acetic acid gas source further prevents excessive concentration at the bottom of the battery cells.

[0019] Optionally, the acetic acid corrosion test chamber also includes a rotating shaft for driving the basket mechanism to rotate. This rotation of the basket mechanism effectively prevents excessive localized corrosion of the battery cells due to excessively high local concentrations of acetic acid gas.

[0020] Optionally, the acetic acid corrosion test chamber further includes a heating system for heating the reaction solution.

[0021] Optionally, the reaction solution includes acetic acid. Attached Figure Description

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0023] Figure 1 This is a schematic diagram of the acetic acid corrosion test chamber provided in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the structure of the second side plate provided in an embodiment of this application;

[0025] Figure 3 These are the EL detection results of the battery cells before and after acetic acid corrosion in the example embodiment, wherein... Figure 3 (a) shows an uncorroded battery cell. Figure 3 (b) The battery cell after corrosion;

[0026] Figure 4 This is the EL detection result of the comparative battery cell before and after acetic acid corrosion, where... Figure 4 (a) shows an uncorroded battery cell. Figure 4 (b) is the battery cell after corrosion.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1-Outer casing; 2-Inner casing; 3-Rotating shaft; 4-Flower basket mechanism; 5-Battery cell. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] In this application, when numerical intervals (i.e., numerical ranges) are involved, unless otherwise specified, the distribution of selectable numerical values ​​within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.

[0032] This application provides a technical solution for an acetic acid corrosion test chamber. Based on this, it solves the problem of uneven corrosion caused by excessive differences in acetic acid gas concentration at different locations on the battery cell. Details are provided below.

[0033] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. It should be understood that these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0034] like Figure 1 As shown, the acetic acid corrosion test chamber includes: an outer chamber 1, an inner chamber 2, and a basket mechanism 4.

[0035] In some embodiments, the outer casing 1 is a closed structure, and the bottom of the outer casing 1 is used to place the reaction liquid; thereby, it is used to provide the reaction liquid. The shape of the outer casing 1 is not limited in the embodiments of this application, as long as it is a closed casing.

[0036] Furthermore, the bottom of the outer casing 1 is provided with a reaction liquid tank for containing the reaction liquid.

[0037] In some embodiments, the basket mechanism 4 is used to mount the battery cell 5; thereby providing a support mechanism for the battery cell.

[0038] In some embodiments, the inner housing 2 is mounted inside the outer housing 1, and the inner housing 2 has adjustable channels distributed on it. The flower basket mechanism 4 is located inside the inner housing 2. Thus, the distribution and size of the adjustable channels on the inner housing 2 can control the acetic acid gas entering the inner housing 2, thereby regulating the concentration distribution of acetic acid gas in the inner housing 2 and thus regulating the concentration of acetic acid gas in various parts of the battery cell 5. This avoids the problem of excessive local concentration caused by the natural flow of acetic acid gas generated in the outer housing 1.

[0039] This application does not limit the shape of the adjustment channel, as long as it is located on the inner box 2 and forms a through channel. For example, the cross-section of the adjustment channel is circular, and the adjustment channel can be a constant diameter channel or a variable diameter channel, which facilitates molding.

[0040] Optionally, the diameter of the regulating channel is 0.5cm to 0.75cm, for example, 0.5cm, 0.6cm, 0.75cm, etc. Therefore, by using a small-diameter regulating channel as a diffusion channel for acetic acid gas, the uniform diffusion of acetic acid gas into the inner chamber 2 can be controlled, so that the vapor in the inner chamber 2 is evenly distributed.

[0041] In some embodiments, the adjustment channels are evenly distributed on the inner housing 2. This facilitates molding.

[0042] In other embodiments, when the inner box 2 has a cuboid shape, the inner box 2 includes a first side plate, a second side plate, a third side plate, a fourth side plate, a fifth side plate, and a sixth side plate. The adjustment channels on each side plate independently satisfy the condition that the total area of ​​the adjustment channels accounts for 10% to 17% of the area of ​​the side plate. Thus, the acetic acid gas entering the inner box 2 can be adjusted by controlling the proportion of the total area of ​​the adjustment channels on each side plate.

[0043] For example, the first and sixth side plates are horizontally arranged, with the first side plate serving as the top plate and the sixth side plate as the bottom plate; while the second, third, fourth, and fifth side plates are four vertically arranged side plates. Preferably, on the sixth side plate, the total area of ​​the adjustment channels accounts for 10% to 12% of the area of ​​the sixth side plate; on the first side plate, the total area of ​​the adjustment channels accounts for 10% to 12% of the area of ​​the first side plate. Thus, relatively few adjustment channels are provided on the sixth side plate near the acetic acid gas source and on the first side plate far from the acetic acid gas source, reducing the amount of acetic acid gas directly entering both ends of the battery cell 5, thereby reducing the accumulation of acetic acid gas at both ends, and ultimately reducing the over-corrosion of the battery cell 5 by acetic acid.

[0044] Furthermore, the second, third, fourth, and fifth side plates independently satisfy the following: the total area of ​​the adjustment channels on each side plate accounts for 15% to 17% of the area of ​​the side plate in which it is located, and the direction from the middle of the side plate to both ends of the side plate ( Figure 2 As indicated by the two arrows in the middle), the area ratio of the regulating channel continuously decreases; thereby increasing the amount of acetic acid gas entering the inner box 2 through the middle of the side plate, and thus increasing the content of acetic acid gas in the area where the concentration is low (the middle position of the battery cell).

[0045] It is worth noting that the adjustment channel ( ) extends from the middle of the side panel to both ends of the side panel. Figure 2 The area ratio of the central hole continuously decreases. Here, the area ratio of the adjustment channel is the ratio of the total area of ​​the adjustment channel on the side plate to the total area of ​​the side plate along the preset length × side plate width in that direction.

[0046] Optionally, the second, third, fourth, and fifth side panels do not have adjustment channels at both ends (top and bottom), but only have multiple adjustment channels in the middle to achieve the adjustment function.

[0047] Optionally, a reaction liquid tank is provided at the bottom of the outer casing 1, and the top of the reaction liquid tank is 10cm to 20cm away from the sixth side plate. Maintaining the aforementioned distance between the sixth side plate and the acetic acid gas source further prevents excessive concentration at the bottom of the battery cell 5.

[0048] In some embodiments, the acetic acid corrosion test chamber further includes: a rotating shaft 3, which drives the basket mechanism 4 to rotate in the following direction. Figure 1 The direction indicated by the rotating arrow. This causes the flower basket mechanism 4 to rotate, and the position of the battery cell 5 in the inner box 2 changes continuously. Moreover, the rotation of the battery cell 5 can drive the flow of acetic acid gas in the inner box 2, further making the distribution of acetic acid gas in the inner box 2 more uniform, effectively preventing excessive local corrosion of the battery cell 5 due to excessively high local concentration of acetic acid gas.

[0049] In some embodiments, the acetic acid corrosion test chamber further includes a heating system for heating the reaction solution. For example, a timed and temperature-controlled heating system can be used to heat the reaction solution at a timed and temperature-controlled manner.

[0050] Optionally, the reaction solution includes acetic acid. For example, the reaction solution may be a mixture of acetic acid, potassium chloride, and water.

[0051] The method for conducting an acetic acid corrosion test using the acetic acid corrosion test chamber according to embodiments of this application includes the following operations:

[0052] S1. Perform IV and EL tests on cell 5 and record the results;

[0053] S2. Prepare a reaction solution by mixing 50ml of acetic acid, 240g of potassium chloride, and 1000ml of water, and place it at the bottom of outer casing 1.

[0054] S3. Place the battery cell 5 into the flower basket mechanism 4;

[0055] S4. Set up a heating system at a temperature of 85℃ for 6 hours to heat the reaction liquid, thereby generating acetic acid gas. The acetic acid gas enters the inner chamber 2 through the regulating channel, comes into contact with the battery cell 5 and corrodes it.

[0056] S5. After corrosion is complete, remove the battery cell 5, wash its surface with water, and then dry it.

[0057] S6. Perform IV and EL tests on the dried battery cells 5;

[0058] S7. Compare the IV test data and EL test data before and after acetic acid corrosion, and calculate the cell degradation rate. Degradation rate = (ETA) 腐蚀后 -ETA 腐蚀前 ) / ETA 腐蚀前 ) × 100%.

[0059] ETA stands for photoelectric conversion efficiency.

[0060] Example

[0061] Acetic acid corrosion test chamber of this application was used to conduct acetic acid corrosion test according to S1 to S7 above. The EL test results of the obtained battery cells are shown in the figure. Figure 3 .

[0062] Comparative Example

[0063] Acetic acid corrosion tests were conducted using an acetic acid corrosion test chamber without an inner casing, following procedures S1 to S7 as described above. The EL test results of the obtained solar cells are shown below. Figure 4 .

[0064] EL measurements of the battery cells before and after acetic acid etching in the comparative examples and examples. Figure 3 (b) and Figure 4 (b) The blackened area is the corrosion area, compared to Figure 3 and Figure 4 It can be seen that the corrosion area of ​​the battery cell using the acetic acid corrosion test chamber without an inner chamber is significantly larger than that using the acetic acid corrosion test chamber of this application. This indicates that the acetic acid corrosion test chamber of this application can reduce the over-corrosion of the battery cell caused by uneven acetic acid gas concentration, especially reducing the over-corrosion of the upper and lower ends of the battery cell. This shows that the presence of the inner chamber in the embodiment of this application can reduce the accumulation of acetic acid gas at the upper and lower ends of the battery cell, making the acetic acid gas distribution more uniform.

[0065] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0066] For ease of description, directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom" generally indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the components themselves. For example, if a device in the drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0067] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] Unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0069] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0070] It should also be noted that the terms "one embodiment," "another embodiment," or "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0071] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0072] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. An acetic acid corrosion test chamber, characterized in that, include: The outer casing (1) is a closed structure, and the bottom of the outer casing (1) is used to place the reaction liquid; The inner box (2) is placed inside the outer box (1), and the inner box has adjustment channels distributed on it; Flower basket mechanism (4), which is located inside the inner box (2), is used to install battery cells (5).

2. The acetic acid corrosion test chamber according to claim 1, characterized in that, The cross-section of the adjustment channel is circular; and / or The adjustment channels are evenly distributed on the inner box (2).

3. The acetic acid corrosion test chamber according to claim 2, characterized in that, The diameter of the adjustment channel is 0.5cm to 0.75cm.

4. The acetic acid corrosion test chamber according to claim 1, characterized in that, When the inner box (2) has a cuboid shape, the inner box (2) includes a first side plate, a second side plate, a third side plate, a fourth side plate, a fifth side plate, and a sixth side plate, and the adjustment channels on each side plate independently satisfy the following: The total area of ​​the adjustment channels accounts for 10% to 17% of the area of ​​the side plate.

5. The acetic acid corrosion test chamber according to claim 4, characterized in that, The first side panel is a top panel, and the total area of ​​the adjustment channels on the first side panel accounts for 10% to 12% of the area of ​​the first side panel; The sixth side plate is a base plate, and the total area of ​​the adjustment channels on the sixth side plate accounts for 10% to 12% of the area of ​​the sixth side plate.

6. The acetic acid corrosion test chamber according to claim 5, characterized in that, The second side plate, the third side plate, the fourth side plate, and the fifth side plate each independently satisfy the following: the total area of ​​the adjustment channel on each side plate accounts for 15% to 17% of the area of ​​the side plate, and the area ratio of the adjustment channel continuously decreases from the middle position of each side plate to both ends of each side plate.

7. The acetic acid corrosion test chamber according to claim 5, characterized in that, The bottom of the outer casing (1) is provided with a reaction liquid tank, and the distance between the top of the reaction liquid tank and the sixth side plate is 10cm to 12cm.

8. The acetic acid corrosion test chamber according to any one of claims 1 to 7, characterized in that, The acetic acid corrosion test chamber also includes: Rotating shaft (3) is used to drive the flower basket mechanism (4) to rotate.

9. The acetic acid corrosion test chamber according to any one of claims 1 to 7, characterized in that, The acetic acid corrosion test chamber also includes a heating system for heating the reaction solution.

10. The acetic acid corrosion test chamber according to any one of claims 1 to 7, characterized in that, The reaction solution includes acetic acid.

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