Pole piece extreme compaction judgment device

Abstract

The utility model provides a pole piece extreme compaction judgment device, which relates to the technical field of pole piece detection and comprises a device support, and the device support comprises an upper support plate, an operation plate and a lower support plate which are sequentially arranged from top to bottom; an operation long groove is formed in the operation panel, an operation long hole is formed in the operation long groove, and the operation long hole corresponds to the light source; and two overturning tables are arranged in the operation long groove. According to the pole piece extreme compaction judgment device provided by the utility model, the creases of the pole piece can be irradiated on the creases of the pole piece through the light source, and the illumination intensity passing through the creases of the pole piece is measured through the illumination intensity meter, so that the compaction of the pole piece is judged, and the standard is unified; compared with the mode of judging whether the light leakage degree of the pole piece only depends on naked eyes to observe the light leakage degree of the pole piece facing the light source, the method is more reliable; and the overturning table is used for folding the pole piece, so that the folding stress stability of the pole piece is more facilitated, and the judgment accuracy is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of electrode detection, and in particular to an electrode limit compaction judgment device. Background Technology

[0002] Lithium-ion batteries are widely used in electric vehicles, residential energy storage, and commercial and industrial energy storage due to their high energy density, long cycle life, and environmental friendliness. However, the ultimate compaction density, a key indicator of lithium battery electrodes, currently lacks a precise device for determining whether an electrode is over-compressed, making it a critical issue that urgently needs to be addressed in the industry. Over-compression of an electrode refers to the fact that the electrode itself has an upper limit to the pressure it can withstand. When the electrode is subjected to pressure exceeding its pressure limit, it becomes brittle, a phenomenon commonly known as over-compression. Such over-compressed electrodes lose their value in manufacturing battery cells.

[0003] Currently, the most widely used method for determining whether lithium battery electrodes are over-pressured is as follows: Fold the test electrode 180° in half lengthwise and lengthwise; unfold the electrode and observe the creases against a light source. If light leaks from the electrode, it is considered severely over-pressured, requiring a significant adjustment of the roller mill's tonnage. If no light leaks, repeat the above steps twice more. After folding the electrode three times, unfold it and observe the creases against a light source. If light leakage is ≥20%, the electrode is over-pressured. If light leakage is ≤20%, the electrode has just reached a state of not being over-pressured; the compaction density of the electrode at this point is also called the electrode's ultimate compaction density. If no light leaks from the electrode at all, it is in a normal state.

[0004] However, there is currently no template for sampling electrode sheets, and the size and crease length of each sample are inconsistent, which affects the accuracy of the judgment. Judging whether an electrode sheet leaks light depends solely on visual observation of the light leakage level under the light source, which is a matter of human perception and is subject to certain biases. Utility Model Content

[0005] The purpose of this invention is to provide an electrode limit compaction judgment device to alleviate the technical problem of inconsistent electrode over-compression sampling, which leads to inconsistent creases and affects the accuracy of judgment.

[0006] This utility model provides a device for judging the ultimate compaction of an electrode sheet, including a device support, wherein the device support includes an upper support plate, an operating plate and a lower support plate arranged sequentially from top to bottom;

[0007] A light source is provided on the upper support plate, and the light source shines towards the operation panel; a light intensity meter is provided on the lower support plate, and the light intensity meter is set corresponding to the light source.

[0008] An operating slot is provided on the operating panel, and an operating hole is provided in the operating slot, with the operating hole corresponding to the light source.

[0009] Two tilting tables are provided in the operating slot, and a fixing component is provided on the tilting table for fixing the electrode sheet on the tilting table.

[0010] In an optional embodiment, the operation panel is provided with a slit for cutting the electrode sheet.

[0011] In an optional embodiment, a fixing member is also included for securing the electrode to the flipping table.

[0012] In an optional embodiment, the fastener is a magnet.

[0013] In an optional embodiment, a light shield is also included, which is disposed outside the device support.

[0014] In an optional embodiment, a side baffle is provided in the operating slot, and the side baffle is located on one side of the tilting table.

[0015] In an optional implementation, the fixing component is a suction cup component.

[0016] In an optional embodiment, the suction cup assembly includes a plurality of suction cups, which are disposed on the flipping table, and the upper surface of the suction cups is not higher than the upper surface of the flipping table.

[0017] In an optional embodiment, the suction cups on one of the flipping tables are alternately arranged with the suction cups on the other flipping table.

[0018] In an optional embodiment, support columns are provided between the upper support plate and the operating plate, and between the operating plate and the lower support plate.

[0019] The electrode compaction judgment device provided by this utility model can judge the compaction of the electrode by shining a light source on the crease of the electrode and measuring the light intensity through the crease using a light intensity meter. The standard is uniform and more reliable than judging the light leakage of the electrode by visually observing the light leakage under the light source. In addition, the use of a flipping table to fold the electrode is more conducive to the stability of the electrode under the force of folding, thus improving the accuracy of the judgment. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the electrode sheet ultimate compaction judgment device provided in an embodiment of the present utility model;

[0022] Figure 2 for Figure 1 The diagram shows the structure of the control panel of the electrode limit compaction judgment device.

[0023] Icons: 100 - Upper support plate; 200 - Operation panel; 300 - Lower support plate; 400 - Light source; 500 - Light intensity meter; 600 - Operation slot; 700 - Operation hole; 800 - Side baffle; 900 - Tilting table; 110 - Suction cup; 120 - Slit; 130 - Support column. Detailed Implementation

[0024] The terms “first,” “second,” “third,” etc., are used only for distinguishing descriptions and do not indicate a sequence number, nor should they be interpreted as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.

[0027] In the description of this application, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” shall be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components.

[0028] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings.

[0029] Reference Figure 1 and Figure 2 This utility model provides an electrode sheet ultimate compaction judgment device, including a device support, which includes an upper support plate 100, an operation plate 200 and a lower support plate 300 arranged sequentially from top to bottom;

[0030] A light source 400 is provided on the upper support plate 100, and the light source 400 shines towards the operation plate 200; a light intensity meter 500 is provided on the lower support plate 300, and the light intensity meter 500 is arranged corresponding to the light source 400.

[0031] An operation slot 600 is provided on the operation panel 200, and an operation hole 700 is provided in the operation slot 600. The operation hole 700 is provided in correspondence with the light source 400.

[0032] Two tilting tables 900 are provided in the operating slot 600, and a fixing component for fixing the electrode sheet on the tilting table 900 is provided on the tilting table 900.

[0033] In some embodiments, an operation slot 600 is provided on the operation panel 200, and two tilting tables 900 are both assembled in the operation slot 600 and can move along the operation slot 600, that is, the distance between the two tilting tables 900 can be adjusted.

[0034] When it is necessary to fold the electrode, place the electrode on the flipping table 900. The flipping table 900 is equipped with a fixing component that can fix the electrode on the flipping table 900. When the two flipping tables 900 are folded together, the electrode is folded. When it is necessary to fold the electrode in the opposite direction, use tweezers or other tools to flip the electrode, flip the table 900 again, and fold it using the flipping table 900. Generally, one flipping table 900 is fixed, and the other flipping table 900 is pressed on the fixed flipping table 900. The weight of the flipping table 900 is used to fold the electrode. This can ensure that the external force on the electrode during folding is not much different, reducing the impact of different folding forces on the accuracy of judgment.

[0035] In an optional embodiment, the operation plate 200 is provided with a slit 120 for cutting the electrode sheet.

[0036] To ensure uniformity in the specifications of the tested electrodes, slits 120 are provided on the operating plate 200. Using a cutting blade and slits 120, the electrodes are cut into uniform sizes, typically into rectangular samples of 5cm x 10cm. The operating plate 200 has multiple slits 120, which can be joined together to form various shapes to meet the needs of samples of different specifications.

[0037] In an optional embodiment, a fastener is also included for securing the electrode to the tilting table 900.

[0038] In an optional embodiment, the fastener is a magnet.

[0039] Marking lines are provided on the operation panel 200. When light leakage detection of the electrode is required, the crease on the electrode is aligned with the marking lines to ensure that the light source 400 can illuminate the crease on the electrode. In order to ensure that the electrode remains fixed during the test, a fixing element can be set on the electrode. The fixing element can be a magnet. The fixing element is magnetically attracted to the flip table 900 to ensure that the crease of the electrode does not change during the light leakage test.

[0040] In an optional embodiment, a light shield is also included, which is disposed outside the device support.

[0041] To ensure that the testing of the electrode creases is not affected by external light, a light shield is installed on the outside of the device support. This avoids the influence of external light sources and improves the accuracy of the test.

[0042] Reference Figure 2 In an optional embodiment, a side baffle 800 is provided in the operating slot 600, and the side baffle 800 is located on one side of the tilting table 900.

[0043] In order to position the electrode sheet between the two flipping tables 900, a side baffle 800 is provided on the side of one flipping table 900 away from the other flipping table 900. When the electrode sheet is placed on the flipping table 900, one end of the electrode sheet abuts against the side baffle 800. In this way, after the electrode sheet is flipped, the position of the electrode sheet remains unchanged. This allows the crease to be folded again.

[0044] In an optional embodiment, the fixing component is a suction cup 110 component.

[0045] In an optional embodiment, the suction cup 110 assembly includes a plurality of suction cups 110, which are disposed on the flip table 900, and the upper surface of the suction cup 110 is not higher than the upper surface of the flip table 900.

[0046] In an optional embodiment, the suction cups 110 provided on one of the flip tables 900 are alternately arranged with the suction cups 110 provided on the other flip table 900.

[0047] To ensure that the electrode does not detach from the flipping table 900 during the folding process, a fixing component is provided on the flipping table 900. This fixing component is generally a suction cup 110. The suction cup 110 is set on the flipping table 900 and has a certain degree of flexibility. When two flipping tables 900 are stacked together, the upper surface of the suction cup 110 will not protrude from the upper surface of the flipping table 900. This ensures that the suction cup 110 will not affect the folding of the electrode by the two flipping tables 900.

[0048] It also includes a vacuum assembly, which is used to connect with the suction cup 110 so that the suction cup 110 can adsorb the electrode onto the flip table 900.

[0049] Generally, multiple suction cups 110 are provided on the flip table 900 to ensure that the electrode can be firmly fixed on the flip table 900. When two flip tables 900 are stacked, the suction cups 110 on the two flip tables 900 are staggered.

[0050] In an optional embodiment, a support column 130 is provided between the upper support plate 100 and the operating plate 200, and between the operating plate 200 and the lower support plate 300.

[0051] When testing the electrode, place the electrode on the operating plate 200 and cut a 5cm*10cm rectangular sample along the slit 120 with a blade; then place the electrode on the flipping table 900 and fix it to the flipping table 900 with the fixing component; then flip one of the flipping tables 900 and press it onto the other flipping table 900, thus folding the electrode in half and creating a crease; when it is necessary to flip the electrode, generally use tweezers to flip the electrode and fix it, and then continue to flip the flipping table 900 so that the crease of the electrode is flipped in the opposite direction again.

[0052] When it is necessary to test the light leakage of the electrode crease, the two flipping stages 900 are spaced apart, and the crease on the electrode is located between the spaces. In this way, when the crease leaks light, the light emitted by the light source 400 can pass through the crease and be detected by the light source 400 intensity meter.

[0053] During detection, turn on the light source 400 and the light intensity meter of the light source 400, and measure the light intensity passing through the electrode sheet. At this time, the light intensity without the electrode sheet placed is T0, and the light intensity after the electrode sheet is placed is T1. If T1 / T0 = 0, the electrode sheet has not leaked light and is in a normal state. If 0 < T1 / T0 < 20%, the electrode sheet is in the ultimate compaction state, and the compaction at this time is the ultimate compaction of the electrode sheet to be measured. If T1 / T0 > 20%, it is determined that the electrode sheet is over-pressed, and the roll pressing tonnage needs to be adjusted downwards.

[0054] The light intensity meter 500 measures the light intensity to calculate the light leakage degree of the electrode sheet, which is more scientific and quantitative, and弥补了 the subjectivity and insufficient accuracy of the human eye observing the light leakage degree of the electrode sheet. Replacing human labor with instruments avoids problems such as uneven force application, uneven folding angles, and relatively subjective observation of the light leakage degree during testing by humans, and ensures the reliability of the test results.

[0055] The crease of the electrode sheet of the electrode sheet ultimate compaction judgment device provided by the present utility model can irradiate the crease of the electrode sheet through the light source 400 and measure the light intensity passing through the crease of the electrode sheet through the light intensity meter 500, and then judge the compaction of the electrode sheet. The standard is unified, which is more reliable than judging whether the electrode sheet leaks light only by visually observing the light leakage degree of the electrode sheet facing the light source 400. And folding the electrode sheet by using the flipping table 900 is more conducive to the stability of the force on the folded electrode sheet and improves the accuracy of judgment.

[0056] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model. It should be noted that there is an unclear expression "弥补了" in the original text. I translated it as "弥补了" for now, but it may need to be further clarified according to the actual situation.

Claims

1. A device for determining the ultimate compaction limit of an electrode sheet, characterized in that, The device includes a support frame, which comprises an upper support plate (100), an operating plate (200), and a lower support plate (300) arranged sequentially from top to bottom; A light source (400) is provided on the upper support plate (100), and the light source (400) shines towards the operation plate (200); a light intensity meter (500) is provided on the lower support plate (300), and the light intensity meter (500) is correspondingly provided with the light source (400); An operation slot (600) is provided on the operation panel (200), and an operation hole (700) is provided in the operation slot (600). The operation hole (700) is provided in correspondence with the light source (400). Two flip tables (900) are provided in the operating slot (600), and a fixing component for fixing the electrode on the flip table (900) is provided on the flip table (900).

2. The electrode sheet ultimate compaction judgment device according to claim 1, characterized in that, The operating panel (200) is provided with a slit (120) for cutting the electrode sheet.

3. The electrode sheet ultimate compaction judgment device according to claim 1, characterized in that, It also includes a fastener for securing the electrode to the tilting table (900).

4. The electrode sheet ultimate compaction judgment device according to claim 3, characterized in that, The fixing element is a magnet.

5. The electrode sheet ultimate compaction judgment device according to claim 1, characterized in that, It also includes a light shield, which is placed over the device support.

6. The electrode sheet ultimate compaction judgment device according to claim 1, characterized in that, A side baffle (800) is provided inside the operating slot (600), and the side baffle (800) is located on one side of the tilting table (900).

7. The electrode sheet ultimate compaction judgment device according to claim 1, characterized in that, The fixing component is a suction cup (110) component.

8. The electrode sheet ultimate compaction judgment device according to claim 7, characterized in that, The suction cup (110) assembly includes a plurality of suction cups (110), which are disposed on the flip table (900), and the upper surface of the suction cup (110) is not higher than the upper surface of the flip table (900).

9. The electrode sheet ultimate compaction judgment device according to claim 6, characterized in that, The suction cups (110) on one of the flip tables (900) are alternately arranged with the suction cups (110) on the other flip table (900).

10. The electrode sheet ultimate compaction judgment device according to claim 1, characterized in that, Support columns (130) are provided between the upper support plate (100) and the operating plate (200), and between the operating plate (200) and the lower support plate (300).

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