Acetic acid test device suitable for battery piece

Abstract

The utility model relates to the technical field of battery piece detection, in particular to an acetic acid test device suitable for a battery piece. The embodiment of the utility model provides an acetic acid test device suitable for a battery piece, and the device comprises a reaction box which comprises a bottom plate, and the bottom plate is provided with a protruding platform; a plurality of strip-shaped grooves are formed in the platform; the space of the reaction box below the platform is used for accommodating an acetic acid reaction solution; when an acetic acid test is carried out, the battery pieces are obliquely arranged in the strip-shaped grooves, and the ends, away from the strip-shaped grooves, of every two adjacent battery pieces make contact with each other. According to the embodiment of the invention, fixation is realized through mutual support of the battery pieces, other fixing structures are not introduced, and the problem of inaccurate acetic acid test caused by shielding of the battery pieces is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell testing, and in particular to an acetic acid testing device suitable for battery cells. Background Art

[0002] Currently, when conducting acetic acid tests on solar cells, the cells are typically placed in a cell basket. During the test, the basket clamps the cells on both sides. During the test, evaporated acetic acid reaction liquid tends to condense at the clamping points, where the condensed acetic acid reaction liquid directly impacts the clamping points on both sides of the cell.

[0003] After the acetic acid test, solar cell module defect detection (EL) is often used to evaluate the cell's resistance to acetic acid (the compatibility of the paste in the cell). EL testing may cause abnormal edge blackening, which is not necessarily caused by a normal acetic acid test. Using a flower basket for acetic acid testing cannot accurately evaluate the cell's resistance to acetic acid.

[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] The embodiments of the present application provide an acetic acid testing device suitable for battery cells to solve or alleviate one or more of the technical problems raised above.

[0006] The present application provides an acetic acid testing device suitable for battery cells, comprising:

[0007] A reaction box, the reaction box comprising a bottom plate, the bottom plate being provided with a raised platform;

[0008] The platform is provided with a plurality of strip-shaped grooves;

[0009] The space of the reaction box located below the platform is used to accommodate the acetic acid reaction liquid;

[0010] When performing the acetic acid test, the battery cells are arranged obliquely in the strip-shaped grooves, and ends of two adjacent battery cells away from the strip-shaped grooves are in contact with each other.

[0011] The embodiments of this application rely on the mutual support of the cells to achieve fixation, without the introduction of other fixing structures. This avoids the problem of inaccurate acetic acid testing caused by obstruction of the cells. Furthermore, the tilted cells provide a shorter diffusion path for the acetic acid reaction solution vapor compared to vertically positioned cells, reducing the concentration difference between the lower and upper portions of the cells. This facilitates the uniform application of the acetic acid reaction solution vapor to the cells, resulting in more accurate test results.

[0012] According to an embodiment of the present application, in an acetic acid test device for a battery cell, the cross-section of the strip-shaped groove is arc-shaped, thereby increasing the contact area between the battery cell and the strip-shaped groove, making the placement of the battery cell more stable.

[0013] According to an embodiment of the present application, in an acetic acid test device suitable for battery cells, the radius of the strip-shaped groove is 1 cm to 2 cm, which is suitable for placing battery cells.

[0014] According to an embodiment of the present application, in an acetic acid test device suitable for battery cells, the spacing between adjacent strip-shaped grooves is 5 cm to 7 cm, thereby placing as many battery cells as possible within the limited space of the reaction box.

[0015] According to an embodiment of the present application, the acetic acid test device for battery cells further includes a fixing wedge; the fixing wedge is used to fix the contact ends of the two adjacent battery cells. Thus, an external fixing mechanism is provided to fix the contact ends of the battery cells, making the battery cells more stable.

[0016] According to an embodiment of the present application, in an acetic acid test device for battery cells, the fixing wedge includes two inclined surfaces; the inclination angles of the two inclined surfaces are consistent with the inclination angles of the two adjacent battery cells; the fixing wedge is positioned outside the contact ends of the two battery cells via the two inclined surfaces to achieve fixation. This prevents the battery cells from sliding sideways while leaning against each other, thereby enhancing the stability of the battery cells during the acetic acid test.

[0017] According to an embodiment of the present application, in an acetic acid test device for battery cells, the width of the inclined surface of the fixed wedge is h The distance between the cells is 2cm to 3cm, thereby reducing the obstruction of the cells.

[0018] According to an embodiment of the present application, in an acetic acid test device for a battery cell, the length of the fixed wedge is l The distance between the solar cells and the solar panel is 40cm to 50cm, thereby reducing the obstruction of the solar cells.

[0019] According to an embodiment of the present application, in an acetic acid test device suitable for battery cells, the cross-section of the fixing wedge is an isosceles trapezoid or an isosceles triangle, thereby achieving fixation of the battery cell.

[0020] According to an embodiment of the present application, in an acetic acid test device for battery cells, the fixing wedge is made of polypropylene, thereby reducing the impact on the battery cells during the acetic acid test.

[0021] According to an embodiment of the present application, in an acetic acid testing device for battery cells, the reaction chamber is rectangular or cube-shaped, and the platform is located at the center of the bottom plate. This makes the conditions of the acetic acid reaction more uniform.

[0022] According to an embodiment of the present application, in an acetic acid testing device suitable for battery cells, the distance between the edge of the platform and the body of the reaction box is greater than 0. Thus, the distribution of the acetic acid reaction liquid vapor is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0024] Figure 1 It is an acetic acid test device for battery cells in the related art;

[0025] Figure 2 Schematic diagram of the structure of the reaction box provided in the embodiment of the present application;

[0026] Figure 3 is a structural schematic diagram of a fixed wedge provided in an embodiment of the present application;

[0027] Figure 4 is a structural schematic diagram of a fixed wedge provided in another embodiment of the present application;

[0028] Figure 5 It is a schematic structural diagram of the acetic acid test device of the embodiment of the present application during the test.

[0029] Description of reference numerals:

[0030] 1-reaction box; 2-platform; 3-strip groove; 4-fixing wedge; 5-battery cell; 6-flower basket. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions, and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and examples. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. This application will be described in detail below with reference to the accompanying drawings and in conjunction with the examples.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] In the present application, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​in the numerical interval is considered to be continuous, and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when the numerical interval only refers to an integer in the numerical interval, including the two endpoint integers of the numerical range, and each integer between the two endpoints, is equivalent to directly enumerating each integer. When multiple numerical ranges are provided to describe a feature or characteristic, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical range 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, a percentage, a ratio, etc. "Numerical interval" allows broadly including quantitative intervals such as percentage intervals, ratio intervals, and ratio intervals.

[0034] In the related art, when solar cells are tested with acetic acid, they are usually placed in a cell basket. During the acetic acid test, both sides of the cell are clamped and fixed by the basket. Figure 1 , it can be seen that both sides of the battery cell 5 are clamped and fixed by the flower basket 6. During the acetic acid test, the following problems exist: the evaporated acetic acid reaction liquid easily condenses at the clamping position, and the condensed acetic acid reaction liquid directly acts on the clamping position on both sides of the battery cell 5.

[0035] The present invention provides an acetic acid test device for battery cells. This device addresses the issue of inaccurate test results caused by direct contact between the battery cell and the acetic acid reaction solution during acetic acid testing. See below for details.

[0036] Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted 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.

[0037] like Figure 2and 4 As shown, the acetic acid testing device for battery cells can include a reaction box 1, which provides a place for battery cells to undergo acetic acid testing. Battery cells 5 and acetic acid reaction solution are placed in the reaction box 1. At a certain temperature, the acetic acid reaction solution turns into vapor, which acts on the battery cells 5 and reacts with the substances on them. After a predetermined reaction time, the battery cells 5 are removed and their state is tested to determine their resistance to acetic acid corrosion. In some specific embodiments, the reaction box 1 includes a base plate with a raised platform 2 provided thereon; the platform 2 is provided with a plurality of strip-shaped grooves 3; a space in the reaction box 1 below the platform is used to accommodate the acetic acid reaction solution. During the acetic acid test, the battery cells 5 are tilted within the strip-shaped grooves 3, with the ends of adjacent battery cells 5 facing away from the strip-shaped grooves 3 touching. Thus, when the acetic acid reaction solution is added to the reaction box 1, it is located below the platform, ensuring that it does not overflow the platform 2, thereby avoiding inaccurate test results caused by direct contact between the battery cells 5 and the acetic acid reaction solution. In this embodiment, the cells 5 are fixed by mutual support, without introducing other fixing structures to avoid obstruction of the cells 5. Furthermore, the inclined cells 5 provide a shorter diffusion path for the acetic acid reaction liquid vapor than the vertically arranged cells 5, which facilitates the uniform application of the acetic acid reaction liquid vapor to the cells 5 and reduces the concentration difference between the lower and upper portions of the cells 5.

[0038] It is understood that during the acetic acid test, the battery cells 5 are tilted within the strip-shaped grooves 3, with the ends of two adjacent battery cells 5 facing away from the strip-shaped grooves 3 touching. This implies that the tilt directions of the two adjacent battery cells 5 are opposite, so that their other ends overlap. The specific placement of the battery cells 5 within the strip-shaped grooves 3 can be selected by those skilled in the art based on actual needs. For example, when there are 10 strip grooves 3, they are numbered 1 to 10 from one side to the other. When placing the battery cells 5, one battery cell 5 can be placed in the strip groove 3 numbered 1, and two battery cells 5 can be placed in the strip groove 3 numbered 2. The battery cell 5 in the strip groove 3 numbered 1 is tilted toward the strip groove 3 numbered 2, and the battery cell 5 in the strip groove 3 numbered 2 near the strip groove 3 numbered 1 is tilted toward the strip groove 3 numbered 1, so that two adjacent battery cells 5 are overlapped. Similarly, two battery cells 5 are placed in the strip grooves 3 numbered 3 to 9, and one battery cell 5 is placed in the strip groove 3 numbered 10. They are tilted and overlapped in the above manner so that two adjacent battery cells 5 away from the strip grooves 3 can contact each other. It can be seen that the acetic acid test device for battery cells is suitable for acetic acid testing of an even number of battery cells 5 when performing acetic acid testing.

[0039] Illustratively, the acetic acid reaction solution includes acetic acid, potassium chloride and water, with the mass fraction of acetic acid being 5% to 10% and the mass fraction of potassium chloride being 2% to 5%; the conditions of the acetic acid test may include reacting at 50° C. to 90° C. for 2 h to 8 h.

[0040] In some embodiments, the reaction chamber 1 is rectangular or cube-shaped, and the platform 2 is located at the center of the bottom plate. This positions the battery cell 5 at the center of the reaction chamber, minimizing the acetic acid concentration gradient and temperature distribution gradient during the acetic acid reaction, and achieving more uniform reaction conditions.

[0041] Furthermore, the distance between the edge of the platform 2 and the body of the reaction box 1 is greater than or equal to 0. Figure 2 As can be seen from the embodiment, the reaction box 1 is rectangular. In the length direction, the distance between the edge of the platform 2 and the reaction box 1 is greater than zero, while in the width direction, the distance between the edge of the platform 2 and the reaction box 1 is equal to zero. Preferably, the distance between the edge of the platform 2 and the reaction box 1 is greater than zero. As a result, the acetic acid reaction liquid is located on all sides of the platform 2, ensuring a more uniform distribution of the acetic acid reaction liquid vapor during the acetic acid test.

[0042] In some embodiments, in the acetic acid testing device for battery cells 5, the cross-section of the strip-shaped groove 3 is arc-shaped. This allows the battery cell 5 to have a larger contact area with the strip-shaped groove 3 than with a non-arc-shaped groove, resulting in more stable placement. This also effectively reduces the risk of battery cells breaking due to collisions during placement. In some embodiments, in the acetic acid testing device for battery cells 5, the radius of the arc-shaped groove is 1 cm to 2 cm, for example, 1 cm, 1.5 cm, or 2 cm. The spacing between adjacent grooves is 5 cm to 7 cm, for example, 5 cm, 6 cm, or 7 cm. The dimensions of the battery cells 5 are typically 210 cm × 182 cm, 182 cm × 182 cm, or 210 cm × 210 cm. This allows for a very small overlap angle between adjacent battery cells 5, allowing for the maximum possible placement of battery cells 5 within the limited space of the reaction chamber 1. In addition, the arrangement of the battery cells 5 is extremely flexible, and the battery cells 5 can be distributed at intervals in the strip-shaped grooves 3 to increase the angle between two adjacent battery cells 5 .

[0043] It is worth noting that the spacing between adjacent grooves is the distance between the centers of adjacent grooves.

[0044] In some embodiments, the acetic acid test device for the battery cell 5 further includes a fixing wedge 4; the fixing wedge 4 is used to fix the contact ends of the two battery cells 5. Thus, an external fixing mechanism is provided to fix the contact ends of the battery cell 5, making the battery cell 5 more stable. Figure 3 The fixing wedge 4 includes two inclined surfaces; the inclination angles of the two inclined surfaces are consistent with the inclination angles of the two battery cells 5; the fixing wedge 4 is mounted on the outside of the contact ends of the two battery cells 5 via the two inclined surfaces to achieve fixation. Thus, the integrated fixing wedge 4 is introduced to limit the position of the battery cells 5 that rely on each other. The integrated fixing wedge 4 is mounted on the outside of the contact ends of the two battery cells 5, which can prevent the battery cells 5 from sliding to the sides, thereby making the battery cells 5 more stable during the acetic acid test. More specifically, depending on whether the two inclined surfaces intersect, the cross-section of the fixing wedge 4 is an isosceles trapezoid or an isosceles triangle, thereby being mounted on the outside of the battery cell 5 to achieve fixation. Figure 3 When the two inclined surfaces do not intersect, the cross section of the fixed wedge 4 is an isosceles trapezoid. It can be understood that when the two inclined surfaces intersect, the cross section of the fixed wedge 4 is an isosceles triangle. Figure 4 shown.

[0045] In some specific embodiments, see Figure 3 and Figure 5 , the length of the fixed wedge 4 l It can be as long as the battery cell 5. Preferably, the length of the fixed wedge 4 is l The distance is 40 cm to 50 cm, for example, 40 cm, 45 cm, 50 cm, etc. Thus, it occupies about 1 / 3 to 1 / 5 of the length of the battery sheet, effectively reducing the contact area while achieving fixation.

[0046] In some specific embodiments, see Figure 3 and Figure 5 , the width of the inclined surface of the fixed wedge 4 h The distance is 2 cm to 3 cm, for example, 2 cm, 2.5 cm, 3 cm, etc. Thus, under the premise of achieving the fixation goal, the overlapping length and width of the battery cell 5 and the inclined surface are reduced, thereby reducing the shielding area of ​​the battery cell 5 by the fixing wedge 4 .

[0047] In some embodiments, the fixing wedge 4 is made of polypropylene, which has low density and stable chemical properties, thereby reducing the impact on the battery cell 5 in the acetic acid test.

[0048] Application Examples

[0049] An acetic acid test device for a battery cell according to an embodiment of the present application is used to perform an acetic acid test on the battery cell, wherein the size of the battery cell is 210 cm×210 cm, and the acetic acid reaction solution includes acetic acid, potassium chloride, and water.

[0050] The mass fraction of acetic acid is 10%, and the mass fraction of potassium chloride is 5%; the reaction conditions of acetic acid are 80℃ and 5h.

[0051] Comparative Example

[0052] The acetic acid test device in the related art was used to conduct an acetic acid test on the battery cell. The specifications of the battery cell, the acetic acid reaction solution and the acetic acid reaction conditions were all consistent with those in the application example.

[0053] The following conclusions were drawn from the test results of the application example and the comparative example: there was a large amount of blackening at the edge of the cell in the application example, while the cell in the comparative example significantly reduced the blackening area, indicating that the use of the acetic acid test device of the embodiment of the present application can greatly alleviate the abnormal blackening phenomenon at the edge of the cell, thereby avoiding the occurrence of inaccurate EL due to device problems.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0055] For ease of description, the directions or positional relationships indicated by directional terms such as "front, back, up, down, left, right," "lateral, vertical, perpendicular, horizontal," and "top, bottom" are generally based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional terms do not indicate or imply that the devices or components referred to must have a specific direction or be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of this application. The directional terms "inside" and "outside" refer to the inside and outside relative to the outline of the components themselves. For example, if the device in the drawings is inverted, the device described as "above" or "on top of" other devices or structures will be positioned "below" or "below" other devices or structures. Therefore, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0056] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] Unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0058] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0059] It should also be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like throughout this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described herein. The appearance of the same expression in multiple places in this specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also fall within the scope of this application.

[0060] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0061] It should also be noted that the above are only preferred embodiments of the present application and do not limit the scope of patent protection of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present application.

Claims

1. An acetic acid test device suitable for battery cells, characterized in that: The reaction box (1) comprises a bottom plate, and a raised platform (2) is provided on the bottom plate; The platform (2) is provided with a plurality of strip-shaped grooves (3); The space of the reaction box (1) located below the platform is used to accommodate the acetic acid reaction liquid; When performing the acetic acid test, the battery cells (5) are arranged obliquely in the strip-shaped groove (3), and the ends of two adjacent battery cells (5) away from the strip-shaped groove (3) are in contact.

2. The acetic acid testing device for battery cells according to claim 1, characterized in that: The cross section of the strip-shaped groove (3) is in the shape of an arc.

3. The acetic acid test device for battery cells according to claim 2, characterized in that: The radius of the strip-shaped groove (3) is 1 cm to 2 cm; or / and The spacing between adjacent strip-shaped grooves (3) is 5 cm to 7 cm.

4. The acetic acid testing device for battery cells according to claim 1, characterized in that: The acetic acid test device suitable for battery cells also includes a fixed wedge (4); The fixing wedge (4) is used to fix the contact ends of the two adjacent battery slices.

5. The acetic acid testing device for battery cells according to claim 4, characterized in that: The fixed wedge (4) comprises two inclined surfaces, and the inclination angles of the two inclined surfaces are consistent with the inclination angles of the two adjacent battery cells (5); The fixing wedge (4) is sleeved on the outside of the contact ends of the two battery cells through the two inclined surfaces to achieve fixation.

6. The acetic acid testing device for battery cells according to claim 5, characterized in that: The width of the inclined surface of the fixed wedge (4) h 2cm to 3cm; and / or The length of the fixed wedge (4) l 40cm~50cm.

7. The acetic acid testing device for battery cells according to claim 5, characterized in that: The cross section of the fixed wedge (4) is an isosceles trapezoid or an isosceles triangle.

8. The acetic acid testing device for battery cells according to claim 5, characterized in that: The material of the fixed wedge (4) is polypropylene.

9. The acetic acid testing device for battery cells according to any one of claims 1 to 8, characterized in that: The reaction box (1) is in the shape of a cuboid or a cube; The platform (2) is located at the center of the base plate.

10. The acetic acid testing device for battery cells according to claim 9, characterized in that: The distance between the edge of the platform (2) and the body of the reaction box (1) is greater than or equal to 0.

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