Label structure for quality inspection of poor pole piece

Abstract

The utility model belongs to the technical field of lithium battery quality inspection, and particularly relates to a label structure for quality inspection of defective pole pieces, which comprises a label body adhered to defective pole pieces, the label body comprises an adhesive part adhered to the pole pieces and a non-adhesive part exposed out of the pole pieces and connected with the adhesive part, and the non-adhesive part is connected with the non-adhesive part. And the area of the non-sticky part is larger than that of the sticky part, so that the relative deformation of the non-sticky part and the sticky part during passing roller winding is reduced, the tension applied to the sticky part is smaller, the label is not easy to fall off, and the stability and the accuracy of screening the defective pole piece are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery quality inspection, and in particular relates to a label structure used for quality inspection of defective pole pieces. Background Art

[0002] During coating and rolling, lithium battery pole pieces will produce pole pieces with poor appearance, such as serious wrinkles, foil leakage, sticking to the roller, and excessive burrs. If these pole pieces are not partially flowed into the later stage of the process, they will not only have a significant impact on the capacity, internal resistance, cycle discharge performance, and rate performance of the lithium battery, but may even cause dangers such as battery heating and fire. Therefore, in the lithium battery production process, it is necessary to detect defects on lithium battery pole pieces, mark abnormal pole pieces with labels, and automatically identify and filter out abnormal pole pieces.

[0003] However, after the existing labels are pasted on the electrode, they are easy to fall off during the electrode roller winding process, making it impossible for defective electrodes to be screened out in the subsequent identification area, causing the defective electrodes to flow into the subsequent production, resulting in a decrease in the qualified rate of the battery.

[0004] Based on this, it is urgent to invent a label structure for quality inspection of defective electrodes. Utility Model Content

[0005] The utility model aims to address the deficiencies of the prior art and to provide a label structure for quality inspection of defective electrodes. By controlling the area of ​​the sticky part to be smaller than that of the non-sticky part, the sticky part is subjected to less tension during roller winding and is not easy to fall off during winding, thereby improving the stability and accuracy of screening for defective electrodes.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] A label structure for quality inspection of defective electrodes, comprising a label body adhered to the electrode of a defective product, the label body comprising an adhesive portion bonded to the electrode and a non-adhesive portion exposed from the electrode and connected to the adhesive portion, the area of ​​the non-adhesive portion being larger than the area of ​​the adhesive portion.

[0008] Specifically, the area of ​​the non-adhesive portion is 1.2-2 times the area of ​​the adhesive portion.

[0009] Specifically, the non-adhesive portion and the adhesive portion are both configured as square, triangular, elliptical or polygonal structures.

[0010] More specifically, the non-adhesive portion and the adhesive portion are both configured in a square shape, and the width A of the non-adhesive portion is 1 Greater than the width A of the adhesive portion 2 .

[0011] More specifically, the width A of the non-adhesive portion is 1 10-15mm, length B 1 The width A of the adhesive portion is 8-12 mm. 2 6-12mm, length B 2 5-10mm.

[0012] Specifically, the thickness of the non-adhesive portion is greater than the thickness of the adhesive portion.

[0013] Specifically, the non-adhesive portion is configured as at least a double-layer structure.

[0014] Specifically, the non-adhesive portion is provided with a hollow area for relieving the winding tension of the pole piece, and the area of ​​the hollow area accounts for 10%-15% of the area of ​​the non-adhesive portion.

[0015] More specifically, there are a plurality of hollow areas, and the plurality of hollow area arrays are evenly distributed in the non-adhesive portion. The hollow areas are configured as circular structures, and the diameter of the hollow areas is 0.3-0.6 mm.

[0016] Specifically, the label body further comprises an anti-overflow glue portion whose two ends are respectively connected to the adhesive portion and the non-adhesive portion, and the distance H between the anti-overflow glue and the adhesive portion and the non-adhesive portion is 2-4 mm.

[0017] The beneficial effect of the utility model is that the function of the non-adhesive part is to be detected in the identification area, and in order to ensure the recognition rate of the non-adhesive part, the area of ​​the non-adhesive part will be set larger, and the adhesive part is connected to the non-adhesive part. Since the non-adhesive part is exposed on the electrode and the adhesive part is adhered to the electrode, when the electrode is rolled, the deformation of the non-adhesive part and the adhesive part is not uniform, which can easily cause the label to fall off. By setting the area of ​​the non-adhesive part larger than the area of ​​the adhesive part, the relative deformation of the non-adhesive part and the adhesive part is reduced, so that the tension on the adhesive part is smaller and does not cause the label structure to fall off, thereby improving the stability and accuracy of screening for defective electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of implementation mode 1 of the present utility model;

[0020] Figure 2 This is one of the structural schematic diagrams of implementation mode 2 of the present utility model;

[0021] Figure 3This is the second structural diagram of implementation mode 2 of the present utility model;

[0022] Figure 4 This is one of the structural schematic diagrams of implementation mode 3 of the present utility model;

[0023] Figure 5 This is the second structural diagram of implementation mode 3 of the present utility model;

[0024] Figure 6 This is one of the structural schematic diagrams of implementation mode 4 of the present utility model;

[0025] Figure 7 This is the second structural diagram of implementation mode 4 of the present utility model;

[0026] Figure 8 for Figure 7 The cross-sectional view along section AA;

[0027] Fig. 9 This is one of the structural schematic diagrams of implementation mode 5 of the present utility model;

[0028] Fig.10 This is the second structural diagram of implementation mode 5 of the present utility model;

[0029] Fig.11 This is a schematic diagram of the pasting of the utility model;

[0030] Among them: 1-label body; 11-adhesive part; 12-non-adhesive part; 121-hollow area; 13-anti-overflow glue part; 2-electrode piece.

[0031] A 1 -Width of the non-adhesive portion; B 1 - length of the non-adhesive portion; A 2 - Width of the adhesive portion; B 2 - length of the adhesive part; H- the distance between the anti-overflow adhesive part and the adhesive part and the non-adhesive part. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Although the present application is disclosed as above in the form of a preferred embodiment, it is not intended to limit the claims. Any person skilled in the art may make several possible changes and modifications without departing from the concept of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

[0035] Implementation Method 1

[0036] like Figure 1 , 11 As shown, the present application provides a label structure for quality inspection of defective electrodes, including a label body 1 pasted on a defective electrode 2, the label body 1 including an adhesive portion 11 bonded to the electrode 2 and a non-adhesive portion 12 exposed from the electrode 2 and connected to the adhesive portion 11, the adhesive portion 11 is used to provide an adhesive force to achieve adhesion between the label and the electrode 2, and the non-adhesive portion 12 is used to be identified as a marker when the electrode 2 passes through an identification area, and the larger the non-adhesive portion 12 is set, the higher the recognition accuracy of the non-adhesive portion 12, therefore, when the label is rolled along with the electrode 2, the adhesive portion 11 is bonded to the electrode 2, the adhesive portion 11 and the electrode 2 are deformed synchronously, and the non-adhesive portion 12 is exposed from the electrode 2, so the electrode 2 cannot directly deform the non-adhesive portion 12. 12 acts to cause it to deform. Since the deformation of the non-adhesive part 12 and the adhesive part 11 is not uniform, tension will be generated between the non-adhesive part 12 and the adhesive part 11. When this tension is greater than the adhesive force between the adhesive part 11 and the electrode 2, the adhesion between the adhesive part 11 and the electrode 2 will fail, and eventually the label will fall off. After the label falls off, the defective electrode 2 cannot be screened out in time, causing the defective electrode 2 to flow into the subsequent process, which will reduce the yield rate of the lithium-ion battery. In the present application, the area of ​​the non-adhesive part 12 is set to be larger than the area of ​​the adhesive part 11. Since the area of ​​the adhesive part 11 is reduced, the total deformation is reduced during the roller, so that the relative deformation between the non-adhesive part 12 and the adhesive part 11 is reduced, and the tension between the non-adhesive part 12 and the adhesive part 11 is reduced.

[0037] Preferably, the area of ​​the non-adhesive portion 12 is 1.2-2 times the area of ​​the adhesive portion 11. When the non-adhesive portion 12 is set too large, the weight of the non-adhesive portion 12 and the wind resistance of the label when moving with the pole piece 2 will make the tension between the non-adhesive portion 12 and the adhesive portion 11 too large, and the label will easily fall off. When the non-adhesive portion 12 is set too small, the relative deformation between the non-adhesive portion 12 and the adhesive portion 11 is large, which will also make the tension between the non-adhesive portion 12 and the adhesive portion 11 too large, and the label will easily fall off. By comprehensively considering the above factors and setting the non-adhesive portion 12 to the above-mentioned area ratio, there is a better effect of reducing tension, making the label more stable after being pasted.

[0038] Implementation Method 2

[0039] like Figure 1 , 2 As shown in , 3, what is different from implementation mode 1 is that the non-adhesive part 12 and the adhesive part 11 of this implementation mode are both set to square, triangular, elliptical or polygonal structures. Structures of different shapes will affect the contact area distribution between the non-adhesive part 12 and the adhesive part 11, thereby affecting the stress concentration. Structures of different shapes may affect the contact mode and mechanical properties between the label and the surface of the electrode, thereby reducing the possibility of falling off. When set to an elliptical structure, the stress of the adhesive part 11 and the electrode is evenly dispersed when passing the roller, and it is not easy for the adhesive part 11 to fall off due to the winding stress when the electrode is rolled over the roller. Setting it to a square, triangular or polygonal structure is based on actual needs, and structures with different numbers of sides are selected for setting. It can be freely selected according to the process of the electrode and balancing factors such as the stiffness, stability, load distribution and stress concentration of the structure.

[0040] Preferably, the non-adhesive portion 12 and the adhesive portion 11 are both set to be square. When the non-adhesive portion 12 and the adhesive portion 11 are set to be square, the manufacturing of the label is more convenient, and the square makes the label sticking easier. The width A of the non-adhesive portion 12 is 1 Greater than the width A of the adhesive portion 11 2This arrangement helps the label to be removed from the release paper. In the prior art, the method of removing the label from the release paper is that the traction belt mechanism pulls the release paper with the label to drive the label to move on the label peeling mechanism. The label release paper turns around at the corner of the label peeling plate. The label is separated from the release paper because its own rigidity exceeds the adhesion between the label and the release paper. The label is continuously fed out. When the width of the adhesive portion 11 is small, this operation will be difficult. Due to the small width, the deformation of the label when turning around at the corner is also relatively large. The non-adhesive portion 11 is small, making it difficult for the label to be removed from the release paper. By setting the width of the non-adhesive portion 12 to be larger, the non-adhesive portion 12 can be easily removed from the release paper, and the non-adhesive portion 12 drives the adhesive portion 11 to be removed from the release paper. Through the above design and optimization, the process of the label being removed from the release paper can be made more stable and accurate, while ensuring the integrity and ease of use of the label. In addition, setting the width of the adhesive portion 11 to be smaller is also conducive to reducing the relative deformation between the adhesive portion 11 and the non-adhesive portion 12, making the label more secure.

[0041] Specifically, the width A of the non-adhesive portion 12 is 1 10-15mm, length B 1 The width A of the adhesive portion 11 is 8-12 mm. 2 6-12mm, length B 2 5-10 mm. For example, the width A of the non-adhesive portion 12 is 1 The length B of the non-adhesive portion 12 can be set to 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm. 1 The width A of the adhesive portion 11 can be set to 8 mm, 9 mm, 10 mm, 11 mm, or 12 mm. 2 The length B of the adhesive portion 11 can be set to 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm. 2 It can be set to 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm. The sizes of the non-adhesive part 12 and the adhesive part 11 are controlled within the above range to make the label have better performance. The size range of the non-adhesive part 12 can ensure that the non-adhesive part 12 can be accurately identified, which is beneficial to accuracy and stability during production and use. The size of the adhesive part 11 matches the size of the non-adhesive part 12, and the proportional relationship between the area and width of the adhesive part 11 and the non-adhesive part 12 is controlled at the same time, so that the tension on the adhesive part 11 is small, thereby reducing damage and deformation of the label, and the label is not easy to fall off from the electrode, and the size of the adhesive part 11 can meet the requirement that the adhesive part 11 will not fall off due to high stress in most electrode rollers.

[0042] The rest is the same as Implementation 1 and will not be described again here.

[0043] Implementation 3

[0044] like Figure 1 , 4 As shown in , 5, the difference from Implementation Example 1 is that the thickness of the non-adhesive portion 12 is greater than the thickness of the adhesive portion 11. In order to ensure the production efficiency so that the production line does not stop and the impact of defective electrodes is evaluated, the electrode does not directly remove the defective electrode part after the label is affixed, but removes the defective electrode from the finished electrode after the whole set of electrode preparation process. Since the label must go through the entire production process with the electrode, it is necessary to ensure that the label does not collapse or curl after high-temperature baking to ensure the recognition rate of the label. Therefore, it is necessary to set the thickness of the non-adhesive portion 12 to be thicker to ensure the hardness of the non-adhesive portion 12, so that the non-adhesive portion 12 will not collapse or curl after the high-temperature baking process in the electrode production, to prevent the non-adhesive portion 12 from causing incorrect recognition of the label due to collapse or curling. Since the adhesive portion 11 sticks to the electrode, the adhesive force will keep the adhesive portion 11 and the electrode at the same bending degree, so the adhesive portion 11 can be set to be thinner.

[0045] Preferably, the non-sticky part 12 is configured to have at least a double-layer structure. The non-sticky part 12 can be configured to be a main layer for ensuring the hardness of the non-sticky part 12, thereby ensuring that the non-sticky part 12 will not collapse or curl after high-temperature baking. An identification layer is set on the surface of the main layer for accurate identification in the identification area.

[0046] The rest is the same as Implementation 1 and will not be described again here.

[0047] Implementation 4

[0048] like Figure 6 , 7 As shown in , 8, it is different from embodiment 1 in that: the non-adhesive portion 12 is provided with a hollow area 121 for relieving the winding tension of the electrode, and the area of ​​the hollow area 121 accounts for 10%-15% of the area of ​​the non-adhesive portion 12. Exemplarily, the percentage of the area of ​​the hollow area 121 to the area of ​​the non-adhesive portion 12 can be 10%, 11%, 12%, 13%, 14%, 15%. Since the hardness of the non-adhesive portion 12 is relatively large, it is easy for the label to generate a large tension on the adhesive portion 11 when it is rolled over. In order to reduce the tension generated by the non-adhesive portion 12 on the adhesive portion 11, the hollow area 121 is provided in the non-adhesive portion 12, and the proportion of the hollow area 121 to the area of ​​the non-adhesive portion 12 is controlled, so as to prevent the hollow area 121 from being set too large and affecting the accuracy of label recognition.

[0049] Preferably, there are multiple hollow areas 121, and the multiple hollow areas 121 are evenly distributed in the non-sticky part 12. The hollow areas 121 are set to a circular structure, and the diameter of the hollow areas 121 is 0.3-0.6mm. The hollow areas 121 are set to a circular structure because the circular structure can withstand a relatively large load, and the force line transmission path can be more reasonable. The internal stress distribution of the non-sticky part 12 can be uniform after high-temperature baking, and the anti-curling effect of the non-sticky part will not be greatly affected after the hollow areas 121 are formed. The diameter of the circular structure of the hollow areas 121 is set to 0.3-0.6mm. The structural strength and bending performance of the non-sticky part 12 within this range are more suitable. This arrangement ensures that the hollow areas 121 will neither be too soft, causing the non-sticky part 12 to be easy to curl, nor too hard, causing excessive tension between the non-sticky part 12 and the sticky part 11. In this way, a reasonable range is maintained to optimize the performance of the hollow areas 121.

[0050] In some embodiments, the width of the distribution area of ​​the hollow area 121 is equivalent to the width A2 of the adhesive portion 11, and the distribution area of ​​the hollow area 121 corresponds to the adhesive portion 11, so that the deformation range of the adhesive area when the label is rolled corresponds to the position of the hollow area 121 in the non-adhesive area. By accurately setting the hollow area 121 at the position where the relative deformation of the adhesive portion 11 and the non-adhesive portion 12 is larger, the area of ​​the hollow area 121 can be reduced, thereby reducing the processing difficulty, and the possibility of curling of the non-adhesive portion 12 is also greatly reduced.

[0051] In some embodiments, the hollow area 121 within the distribution area of ​​the hollow area 121 is replaced with a "v"-shaped groove structure. When set to a "v"-shaped groove structure, the bending performance of the non-adhesive portion 12 can be enhanced and directional bending can be achieved, so that the bending of the non-adhesive area and the adhesive area can be precisely matched, and no bending in an inappropriate direction will affect the recognition of the label.

[0052] The rest is the same as Implementation 1 and will not be described again here.

[0053] Implementation method 5

[0054] like Fig. 9 , 10As shown, what is different from Embodiment 1 is that: the label body 1 of this embodiment also includes an anti-overflow glue part 13 whose two ends are respectively connected to the sticky part 11 and the non-sticky part 12, and the distance H between the anti-overflow glue and the sticky part 11 and the non-sticky part 12 is 2-4mm. Exemplarily, the distance H between the anti-overflow glue and the sticky part 11 and the non-sticky part 12 can be set to 2mm, 3mm, 4mm. The glue of the sticky part 11 is easy to overflow into the non-sticky part 12 after high-temperature baking, and then stick to the winding roller, which is easy to make the non-sticky part 12 stick to the winding roller and then make the label fall off. The glue stuck on the winding roller may also stick to the electrode from the winding roller to contaminate the electrode, and when the pasting position deviates when pasting the label, the sticky part 11 is easy to be exposed, and then the glue sticks to the winding roller. After the anti-overflow glue part 13 is provided, the sticky part 11 can be separated to ensure that the glue of the sticky part 11 will not affect other parts.

[0055] In some embodiments, the anti-overflow glue portion 13 is set to be trumpet-shaped, and the width of the anti-overflow glue portion 13 is gradually reduced in the direction from the non-adhesive portion 12 to the adhesive portion 11, so as to achieve a transition in the width of the non-adhesive portion 12 and the adhesive portion 11, so that there is a transition in the relative deformation between the adhesive portion 11 and the non-adhesive portion 12 when the label passes the roller, which helps to reduce the tension between the adhesive portion 11 and the non-adhesive portion 12.

[0056] The rest is the same as Implementation 1 and will not be described again here.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A label structure for quality inspection of defective electrodes, characterized in that: The invention comprises a label body (1) which is adhered to a pole piece of a defective product, wherein the label body (1) comprises an adhesive portion (11) bonded to the pole piece and a non-adhesive portion (12) exposed from the pole piece and connected to the adhesive portion (11), wherein the area of ​​the non-adhesive portion (12) is larger than the area of ​​the adhesive portion (11).

2. The label structure for quality inspection of defective electrodes according to claim 1, characterized in that: The area of ​​the non-adhesive portion (12) is 1.2-2 times the area of ​​the adhesive portion (11).

3. The label structure for quality inspection of defective electrodes according to claim 1, characterized in that: The non-adhesive portion (12) and the adhesive portion (11) are both configured as square, triangular, elliptical or polygonal structures.

4. The label structure for quality inspection of defective electrodes according to claim 3, characterized in that: The non-adhesive portion (12) and the adhesive portion (11) are both arranged in a square shape, and a width A1 of the non-adhesive portion (12) is greater than a width A2 of the adhesive portion (11).

5. The label structure for quality inspection of defective electrodes according to claim 4, characterized in that: The width A1 of the non-adhesive portion (12) is 10-15 mm, and the length B1 is 8-12 mm; the width A2 of the adhesive portion (11) is 6-12 mm, and the length B2 is 5-10 mm.

6. The label structure for quality inspection of defective electrodes according to claim 1, characterized in that: The thickness of the non-adhesive portion (12) is greater than the thickness of the adhesive portion (11).

7. The label structure for quality inspection of defective electrodes according to claim 1, characterized in that: The non-adhesive portion (12) is configured as at least a double-layer structure.

8. The label structure for quality inspection of defective electrodes according to claim 1, characterized in that: The non-adhesive portion (12) is provided with a hollow area (121) for relieving the winding tension of the pole piece, and the area of ​​the hollow area (121) accounts for 10%-15% of the area of ​​the non-adhesive portion (12).

9. The label structure for quality inspection of defective electrodes according to claim 8, characterized in that: The number of the hollow areas (121) is multiple, and the multiple hollow areas (121) are evenly distributed in an array on the non-adhesive part (12), and the hollow areas (121) are arranged in a circular structure, and the diameter of the hollow areas (121) is 0.3-0.6 mm.

10. The label structure for quality inspection of defective electrodes according to claim 1, characterized in that: The label body (1) further comprises an anti-glue overflow portion (13) whose two ends are respectively connected to the adhesive portion (11) and the non-adhesive portion (12); the distance H between the anti-glue overflow portion (13) and the adhesive portion (11) and the non-adhesive portion (12) is 2-4 mm.

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