Adhesive tape and adhesive tape assembly

Abstract

The utility model discloses an adhesive tape and an adhesive tape assembly, and relates to the technical field of battery cell production. The adhesive tape comprises a substrate layer, the substrate layer comprises a first area and a second area surrounding the first area, the first area is provided with a color changing layer, the color changing layer changes color after meeting water, and the second area is provided with a glue layer. The substrate layer is divided into a first area corresponding to the battery cell liquid injection hole and a second area fixed on the battery cell in an adhering manner, and the first area and the second area are matched to seal the battery cell liquid injection hole, so that water can be prevented from entering the battery cell. The first area is provided with the color-changing layer which changes color when encountering water, and the color-changing layer changes color when water enters the battery cells accidentally, so that operation and maintenance personnel can conveniently and quickly screen out unqualified battery cells with water, and the production yield of the battery cells is ensured. Compared with the situation that the building cost and the production operation and maintenance cost of a plant are increased due to the fact that temperature and humidity control is adopted in the battery cell rear-section generation process, the production operation and maintenance cost is low when temperature and humidity control is conducted on battery cell rear-section generation through the adhesive tape.

Description

Technical Field

[0001] This application relates to the field of battery cell manufacturing technology, and in particular to an adhesive tape and an adhesive tape assembly. Background Technology

[0002] Currently, in the later stages of battery cell production, strict temperature and humidity control is implemented in the production workshop to prevent moisture from the air from entering the battery cells. However, this temperature and humidity control also increases the construction and maintenance costs of the factory. The construction cost of temperature and humidity control in overseas factories is ten times higher than that in China. Continuing to implement temperature and humidity control measures will increase the company's operating costs exponentially. Summary of the Invention

[0003] The embodiments of this application provide an adhesive tape and an adhesive tape assembly. By sealing the liquid injection hole of the battery cell with the adhesive tape, not only can moisture be prevented from entering the battery cell, but the adhesive tape can also detect whether water has entered the battery cell, thereby reducing the production and maintenance costs of the battery cell.

[0004] The tape according to the embodiments of this application includes a base layer, the base layer including a first region and a second region surrounding the first region, the first region being provided with a color-changing layer, the color-changing layer changing color upon contact with water, and the second region being provided with an adhesive layer.

[0005] In some embodiments, the height of the color-changing layer is lower than the height of the adhesive layer along the direction from the base layer to the color-changing layer.

[0006] In some embodiments, the tape is used to seal the electrolyte injection hole of the battery cell, and the first region covers the electrolyte injection hole in the projection of the battery cell.

[0007] In some embodiments, both the first region and the injection hole are circular, and the difference between the diameter of the first region and the diameter of the injection hole is greater than 3 mm.

[0008] In some embodiments, the minimum distance from the edge of the adhesive layer to the edge of the color-changing layer is greater than 5 mm.

[0009] In some embodiments, the area ratio of the first region to the second region is 1 / 3.

[0010] In some embodiments, the color-changing layer and the adhesive layer are different colors.

[0011] In some embodiments, the base layer further includes a third region connected to the second region, wherein, when the tape seals the injection hole, the third region is at least partially not in contact with the battery cell and / or the adhesive layer is at least partially absent from the third region.

[0012] In some embodiments, the shape of the first region matches the shape of the injection hole.

[0013] The tape assembly described in this application includes a plurality of tapes as described in any of the above embodiments, and the plurality of tapes are connected in sequence.

[0014] In some embodiments, adhesive layers of a plurality of tapes are continuously coated on the first region of a plurality of tapes.

[0015] In some embodiments, a cutting line is provided between two adjacent tapes.

[0016] In the tape and tape assembly of the present application embodiments, the base layer is divided into a first region corresponding to the liquid injection hole of the battery cell and a second region that is adhered and fixed to the battery cell. The first region and the second region cooperate to seal the liquid injection hole of the battery cell, thereby preventing moisture from entering the battery cell.

[0017] Furthermore, the first area is equipped with a color-changing layer that changes color when exposed to water. If water accidentally gets into the battery cell, the color-changing layer will change color, which makes it easier for maintenance personnel to quickly screen out unqualified battery cells that have been exposed to water, thus ensuring the yield rate of battery cell production.

[0018] Compared to temperature and humidity control during the later stages of battery cell production, which increases the construction and maintenance costs of the factory, using tape for temperature and humidity control during the later stages of battery cell production results in lower production and maintenance costs.

[0019] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the embodiments of this application will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the planar structure of the tape according to certain embodiments of this application.

[0022] Figure 2 This is a three-dimensional structural diagram of an adhesive tape assembly according to certain embodiments of this application.

[0023] Figure 3 This is a schematic diagram illustrating a scenario where tape is applied to a battery cell according to certain embodiments of this application.

[0024] Key component designations:

[0025] Tape assembly 100, tape 10, base layer 14, first region 11, second region 12, third region 13; cutting line 20; battery cell 200; injection hole 210. Detailed Implementation

[0026] The embodiments of this application will be further described below with reference to the accompanying drawings. The same or similar reference numerals in the drawings denote the same or similar elements or elements having the same or similar functions throughout.

[0027] Furthermore, the embodiments of this application described below in conjunction with the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting this application.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] Please see Figures 1 to 3 This application provides an adhesive tape 10, which includes a base layer 14. The base layer 14 includes a first region 11 and a second region 12 surrounding the first region 11. The first region 11 is provided with a color-changing layer that changes color when exposed to water. The second region 12 is provided with an adhesive layer.

[0030] In the tape 10 of this application embodiment, the base layer 14 is divided into a first region 11 corresponding to the liquid injection hole 210 of the battery cell 200 and a second region 12 that is adhered and fixed to the battery cell 200. The first region 11 and the second region 12 cooperate to seal the liquid injection hole of the battery cell 200, which can prevent moisture from entering the battery cell 200.

[0031] Furthermore, the first area 11 is equipped with a color-changing layer that changes color when exposed to water. If water accidentally enters the battery cell 200, the color-changing layer will change color, which makes it easier for maintenance personnel to quickly screen out unqualified battery cells 200 that have been exposed to water, thus ensuring the production yield of battery cells 200.

[0032] Compared to temperature and humidity control during the cell 200 production process, which increases the construction and maintenance costs of the factory, using tape 10 for temperature and humidity control during the cell 200 production process results in lower production and maintenance costs.

[0033] Please see Figure 1 This application provides a tape assembly 100, which includes a plurality of tapes 10.

[0034] Optionally, the tape 10 assembly forms a film roll. Multiple tapes 10 may be sequentially connected and rolled up to form a film roll.

[0035] Optionally, a cutting line 20 is provided between two adjacent tapes 10.

[0036] Generally, each cell 200 needs to be sealed with a piece of tape 10. When maintenance personnel use it, they only need to cut along the cutting line 20 to cut a piece of tape 10 from the tape assembly 100, thereby sealing the cell 200 with the cut tape 10.

[0037] Optionally, the cutting line 20 can be an indicator line to guide maintenance personnel to make the cut; or the tape 10 on both sides of the cutting line 20 can be only partially connected, so that maintenance personnel can quickly tear off a piece of tape 10 with just a little force.

[0038] In some embodiments, the tape 10 includes a base layer 14, the base layer 14 including a first region 11 and a second region 12 surrounding the first region 11, the first region 11 being provided with a color-changing layer that changes color when exposed to water, and the second region 12 being provided with an adhesive layer.

[0039] The base layer 14 is made of waterproof material. After the tape 10 seals the liquid injection hole 210 of the battery cell 200, it can isolate the battery cell 200 from external moisture.

[0040] Optionally, the surface of the base layer 14 opposite to the battery cell 200 can be made of an electrolyte-resistant material (such as polytetrafluoroethylene (PTFE)) to avoid the influence of the electrolyte in the battery cell 200 on the tape 10.

[0041] Optionally, adhesive layers of multiple tapes 10 are continuously applied to the first region 11 of the multiple tapes 10.

[0042] Thus, when manufacturing tape assembly 100, the first regions 11 of multiple tapes 10 can serve as a continuous substrate, thereby continuously coating the adhesive layer onto the first regions 11 of multiple tapes 10, improving the production efficiency of tape assembly 100.

[0043] In some embodiments, the base layer 14 is divided into a first region 11 corresponding to the liquid injection hole 210 of the cell 200, and a second region 12 for attaching to the surface of the cell 200 near the liquid injection hole 210, the second region 12 being disposed around the first region 11.

[0044] When the tape 10 is attached to the cell 200, the first region 11 covers the injection hole 210, and the second region 12 is at least partially attached to the surface of the cell 200 near the injection hole 210 to fix the tape 10.

[0045] Optionally, the size of the first region 11 is determined based on the size of the liquid injection hole 210 of the cell 200.

[0046] For example, the projected area of ​​the first region 11 on the surface of the cell 200 covers the injection hole 210.

[0047] Optionally, both the first region 11 and the injection hole 210 are circular, and the radius of the first region 11 is larger than the radius of the injection hole 210. For example, the difference between the diameter of the first region 11 and the diameter of the injection hole 210 is greater than 3 mm. In this way, by setting the first region 11 to be larger than the injection hole 210 and appropriately sized, the first region 11 can better cover the injection hole 210, preventing the glue from the second region 12 from contaminating the location of the injection hole 210.

[0048] The first area 11 is equipped with a color-changing layer.

[0049] Alternatively, the color-changing layer can be color-changing cotton paper, cobalt-containing compound materials, acid-base indicator materials, etc.

[0050] For example, color-changing cotton paper is a type of functional paper that can change color according to changes in the external environment, and it is usually made of cotton fibers.

[0051] For example, cobalt-containing compound materials (such as cobalt chloride) exhibit distinct color changes during hydration and dehydration. Anhydrous cobalt chloride is blue, but upon absorbing moisture, it transforms into pink cobalt chloride hexahydrate. This color change is reversible, and it reverts to blue upon drying. The color change is obvious and easily observed with the naked eye, allowing for rapid detection of moisture intrusion. Furthermore, it has a fast response time, displaying the color change within a short period.

[0052] For example, some acid-base indicators change color under different humidity conditions. For instance, bromocresol green is blue in a dry environment, but gradually turns yellow when it comes into contact with water due to the slightly acidic nature of the water.

[0053] Optionally, the diameter of the first region 11 is larger than the diameter of the injection hole 210. In this way, by setting the diameter of the first region 11 to be larger than the diameter of the injection hole 210, it is ensured that the first region 11 can completely cover the injection hole 210, thus preventing the glue from the second region 12 from contaminating the injection hole 210 and the battery cell 200.

[0054] Optionally, the difference between the diameter of the first region 11 and the diameter of the injection hole 210 is greater than 3 mm. Thus, by reasonably setting the size difference between the first region 11 and the injection hole 210, it is ensured that the first region 11 can completely cover the injection hole 210, while allowing for a certain margin of error. Even if maintenance personnel do not perfectly align the injection hole 210, they can still ensure that the first region 11 completely covers it, thereby preventing glue contamination of the injection hole 210 and the battery cell 200 by the second region 12.

[0055] Optionally, the shape of the first region 11 matches the shape of the injection hole 210.

[0056] To ensure that the color-changing layer of the first region 11 can better cover the injection hole 210 without excessive redundant areas, the shape of the first region 11 can match the shape of the injection hole 210. For example, both the first region 11 and the injection hole 210 can be circular, rectangular, or the like.

[0057] The second area 12 is equipped with an adhesive layer.

[0058] Optionally, the adhesive viscosity of the adhesive layer is defined according to the international standard GB279-2014, and the average peel strength at 180 degrees is greater than or equal to 0.5 N / cm to ensure a firm bond.

[0059] Optionally, along the direction from the base layer 14 to the color-changing layer, the height of the color-changing layer is lower than the height of the adhesive layer.

[0060] It is understandable that the color-changing layer is used to cover the injection hole 210, but the material of the color-changing layer itself may contaminate the injection hole 210. The injection hole 210 is the location where the battery cell 200 will be sealed and welded later. If there is any residual color-changing layer material, it may affect the reliability of the sealing of the battery cell 200.

[0061] Therefore, along the direction from the base layer 14 to the color-changing layer, the height of the color-changing layer is set lower than that of the adhesive layer. For example, if the edge of the injection hole 210 is generally flush with the surface of the cell 200, after the tape 10 is attached to the surface of the cell 200, there will be a certain gap between the injection hole 210 and its edge, thus avoiding contamination of the injection hole 210 by the color-changing layer. As another example, if the edge of the injection hole 210 is slightly higher than the surface of the cell 200, the height difference between the color-changing layer and the adhesive layer needs to be greater than the height difference between the edge of the injection hole 210 and the surface of the cell 200, thus ensuring that the color-changing layer does not contact the edge of the injection hole 210, thereby avoiding contamination of the injection hole 210 by the color-changing layer.

[0062] Optionally, the area ratio of the first region 11 to the second region 12 is 1 / 3. This provides a reasonable adhesive application area, ensuring the strong adhesion of the tape 10 and high short-term sealing reliability.

[0063] Optionally, the minimum distance between the edge of the adhesive layer and the edge of the color-changing layer is greater than 5 mm. In this way, by reasonably setting the distance between the edge of the adhesive layer and the edge of the color-changing layer, the contact area between the adhesive layer and the surface of the battery cell 200 can be guaranteed, thereby improving the adhesion and sealing reliability.

[0064] Optionally, the color-changing layer and the adhesive layer are different colors.

[0065] To facilitate sealing of the injection hole 210 by maintenance personnel, the color-changing layer and the adhesive layer are set to different colors. This allows maintenance personnel to align the color-changing layer with the injection hole 210 when applying the tape 10, thus better covering the injection hole 210. Furthermore, the diameter of the first area 11 corresponding to the color-changing layer is larger than the diameter of the injection hole 210, ensuring that even with slight misalignment, the color-changing layer will still cover the injection hole 210.

[0066] In some embodiments, the base layer 14 further includes a third region 13 connected to the second region 12, wherein, when the tape 10 seals the injection hole 210, the third region 13 is at least partially not in contact with the cell 200.

[0067] It is understandable that the purpose of tape 10 is only to isolate the battery cell 200 from external moisture before the battery cell 200 is sealed and welded. The injection hole needs to be sealed and welded later, so tape 10 needs to be removed.

[0068] Therefore, the base layer 14 can also be provided with a third region 13, which is connected to the second region 12. When the tape 10 is pasted on the surface of the cell 200, at least part of the third region 13 will not be in contact with the cell 200, so that maintenance personnel can quickly tear off the tape 10 through the uncontacted part of the third region 13.

[0069] Optionally, at least part of the third region 13 is not provided with an adhesive layer, so that even if at least part of the third region 13 comes into contact with the battery cell 200, there will be no adhesive residue, and the tape 10 can be easily removed.

[0070] Optionally, the tape 10 may be rectangular, circular, or the like.

[0071] Optionally, in two adjacent tapes 10, two second regions 12 are connected, and two third regions 13 are connected. In this way, the width of the connected part is wider, and a tape assembly 100 (film roll) of the same thickness can hold more tapes 10.

[0072] Optionally, the second regions 12 of two adjacent tapes 10 are connected, and the third regions 13 are spaced apart.

[0073] Thus, the connection between two adjacent tapes 10 is reduced, and individual tapes 10 can be more easily separated from the tape assembly 100 through the third region 13.

[0074] Optionally, in two adjacent tapes 10, the second region 12 of one tape 10 and the third region 13 of the other tape 10 are connected.

[0075] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one feature. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.

[0077] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An adhesive tape, characterized in that The tape includes a base layer, the base layer includes a first region and a second region surrounding the first region, the first region is provided with a color-changing layer, the color-changing layer changes color when it comes into contact with water, and the second region is provided with an adhesive layer.

2. The adhesive tape according to claim 1, characterized in that The tape further includes at least one of the following features: Along the direction from the base layer to the color-changing layer, the height of the color-changing layer is lower than the height of the adhesive layer; and The minimum distance from the edge of the adhesive layer to the edge of the color-changing layer is greater than 5 mm.

3. The adhesive tape of claim 1, wherein The tape is used to seal the electrolyte injection hole of the battery cell, and the first area covers the electrolyte injection hole in the projection of the battery cell.

4. The adhesive tape according to claim 3, characterized in that Both the first region and the injection hole are circular, and the difference between the diameter of the first region and the diameter of the injection hole is greater than 3 mm.

5. The adhesive tape of claim 1, wherein The tape further includes at least one of the following features: The area ratio of the first region to the second region is 1 / 3; and The color-changing layer and the adhesive layer are different colors.

6. The adhesive tape of claim 1, wherein The base layer further includes a third region connected to the second region, wherein, in the case where the tape seals the liquid injection hole of the battery cell, the third region is at least partially not in contact with the battery cell and / or the adhesive layer is at least partially absent from the third region.

7. The adhesive tape of claim 1, wherein The shape of the first region matches the shape of the electrolyte injection hole in the battery cell.

8. An adhesive tape assembly characterized by, The tape assembly includes a plurality of tapes as described in any one of claims 1-7, wherein the plurality of tapes are connected in sequence.

9. The tape assembly according to claim 8, characterized in that, The adhesive layers of the plurality of tapes are continuously coated on the first region of the plurality of tapes.

10. The tape assembly of claim 8, wherein, A cutting line is provided between two adjacent tapes.

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