A type of tape for electrode attachment
By incorporating cutting aids and spaced adhesive layers into the electrode attaching tape, the safety risks and residual adhesive contamination caused by cutting burrs in lithium-ion battery production are resolved, thus extending the service life of the cutter.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 阿特斯储能科技有限公司
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-17
Smart Images
Figure CN224513422U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of battery manufacturing technology, and relates to an adhesive tape, particularly an adhesive tape for attaching electrode sheets. Background Technology
[0002] In the lithium-ion battery production process, the winding process is a crucial step in forming an electrode assembly by winding the positive and negative electrode sheets, which are cut with a cutting tool, together with the separator. With the booming development of the energy storage industry, the application scenarios for lithium-ion batteries are constantly expanding, and market demand is increasing dramatically. To adapt to the growth in the scale of power energy storage and the demand for large-scale, long-term energy storage solutions, the industry generally develops ultra-large capacity cells to improve the volumetric energy density of energy storage systems, save on components, and reduce manufacturing costs.
[0003] However, this development trend also brings new technological challenges. On the one hand, the increase in cell capacity makes the size and processing requirements of the electrodes more stringent; on the other hand, in order to further improve energy density, the thickness of the separator is becoming thinner and thinner, which significantly increases the safety risks caused by burrs generated during the cutting process. When the electrodes are cut, horizontal or vertical burrs are easily generated at the cut ends. Once these burrs pierce the separator, they can easily cause internal short circuits in the cell, or even lead to serious safety accidents such as fires.
[0004] Currently, the industry typically uses a 30μm thick adhesive tape applied to the cut edge of the positive electrode sheet to improve the burr problem during cutting. However, this method has significant drawbacks. Protective adhesive residue remains at the cut edge, which not only affects the quality of the battery cell but is also difficult to clean, easily accumulating on the cutter and shortening its lifespan, thus increasing production costs and equipment maintenance difficulties.
[0005] In summary, how to effectively mitigate the safety risks posed by cutting burrs while simultaneously addressing residual adhesive contamination at the cut edge of the protective adhesive and the shortened lifespan of the cutting blade has become a pressing technical challenge in the current lithium-ion battery production process. Utility Model Content
[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an adhesive tape for electrode attachment, which can effectively improve the safety risks caused by cutting burrs, and solve the problems of residual adhesive pollution at the cut of the protective adhesive and shortened service life of the cutter.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] This utility model provides an adhesive tape for electrode attachment, comprising a polymer film layer and an adhesive layer stacked together, wherein the polymer film layer has a cutting auxiliary groove at the center line of its long axis.
[0009] With the cutting auxiliary notch as the axis of symmetry, the adhesive layer is divided into two parallel adhesive sub-layers, and the outer edge of the adhesive sub-layer coincides with the edge of the polymer film layer.
[0010] Let the width of the polymer film be D and the width of the adhesive sublayer be d, then d < D / 2.
[0011] The tape provided by this utility model effectively reduces the safety risks caused by cutting burrs by using an intermittent coating of adhesive layers and adding cutting auxiliary grooves, while avoiding residual adhesive contamination at the cut point and improving the service life of the cutter.
[0012] Preferably, if the adhesion width of the electrode sheet on the tape surface is set to a, then d > a.
[0013] Preferably, the cutting auxiliary notches are arranged in a dotted line pattern, and the distance between adjacent notches is 1-3 mm.
[0014] Preferably, in the cutting auxiliary notches, the length of a single notch is 0.5-1.5mm and the width of a single notch is 0.2-0.8mm.
[0015] Preferably, the breaking tensile force of the cutting auxiliary notch is ≥20N.
[0016] Preferably, the width D of the polymer film layer and the width d of the viscose sublayer satisfy: D / 3 < d < D / 2.
[0017] Preferably, the width of the polymer film is D = 10-30 mm.
[0018] Preferably, the width of the adhesive sublayer is d = 4-12 mm.
[0019] Preferably, the two adhesive sublayers have the same width.
[0020] Preferably, the thickness of the tape is 20-40 μm.
[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0022] The tape provided by this utility model effectively reduces the safety risks caused by cutting burrs by using an intermittent coating of adhesive layers and adding cutting auxiliary grooves, while avoiding residual adhesive contamination at the cut point and improving the service life of the cutter. Attached Figure Description
[0023] Figure 1 A schematic diagram of the cross-section of the tape provided in Example 1;
[0024] Figure 2This is a schematic diagram of the tape plan provided in Example 1;
[0025] Figure 3 This is a schematic diagram of the structure of the electrode sheet attached using the tape provided in Example 1;
[0026] Figure 4 This is a schematic diagram showing the cutting of the electrode sheet after attaching it with the tape provided in Example 1;
[0027] Figure 5 A schematic diagram of the tape cross-section provided for Comparative Example 1;
[0028] Figure 6 This is a schematic diagram of the structure of the electrode sheet attached using tape provided in Comparative Example 1;
[0029] Figure 7 This is a schematic diagram showing the cutting of the electrode sheet after attaching it with the tape provided in Comparative Example 1.
[0030] Wherein: 10-polymer film layer; 11-cutting auxiliary notch; 20-adhesive layer; 21-adhesive sublayer; 30-electrode. Detailed Implementation
[0031] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.
[0032] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] One embodiment of this utility model provides an adhesive tape for electrode attachment, comprising a polymer film layer and an adhesive layer stacked together, wherein the polymer film layer has a cutting auxiliary groove at the center line of its long axis.
[0034] With the cutting auxiliary notch as the axis of symmetry, the adhesive layer is divided into two parallel adhesive sub-layers, and the outer edge of the adhesive sub-layer coincides with the edge of the polymer film layer.
[0035] Let the width of the polymer film be D and the width of the adhesive sublayer be d, then d < D / 2.
[0036] This invention ensures that a glue-free area is reserved between the two parallel adhesive sub-layers by limiting the outer edge of the adhesive sub-layer to coincide with the edge of the polymer film layer, and further limiting the width d of the adhesive sub-layer to be less than half the width D of the polymer film layer, and the cutting auxiliary notch is located in the center of this glue-free area.
[0037] The tape provided by this utility model effectively reduces the safety risks caused by cutting burrs by using an intermittent coating of adhesive layers and adding cutting auxiliary grooves, while avoiding residual adhesive contamination at the cut point and improving the service life of the cutter.
[0038] In some embodiments, the adhesion width of the electrode sheet on the tape surface is set to a, then d > a.
[0039] This invention ensures that the upper and lower tapes are in a close fit after the electrode is cut and attached by limiting the width d of the adhesive layer to be greater than the attachment width a of the electrode on the tape surface, and at the same time further improves the service life of the cutter.
[0040] In some embodiments, the cutting auxiliary notches are arranged in a dotted line pattern, and the distance between adjacent notches is 1-3 mm, for example, it can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm or 3 mm, but is not limited to the listed values, other unlisted values within this range are also applicable.
[0041] In some embodiments, the length of a single cut in the cutting auxiliary notch is 0.5-1.5 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or 1.5 mm, and the width of a single cut is 0.2-0.8 mm, for example, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm, but is not limited to the listed values; other unlisted values within this range are also applicable.
[0042] In some embodiments, the breaking tensile force of the cutting auxiliary notch is ≥20N, for example, it can be 20N, 21N, 22N, 23N, 24N, 25N, 26N, 27N, 28N, 29N or 30N, but is not limited to the listed values, other unlisted values within this range are also applicable.
[0043] In this invention, the breaking tensile force of the cutting auxiliary notch specifically refers to the maximum tensile force at both ends of the cutting auxiliary notch at 180°. Since the maximum tension of the electrode sheet during the winding process is generally 10N, the tape provided by this invention will not break during the entire winding process.
[0044] In some embodiments, the width D of the polymer film layer and the width d of the adhesive sublayer satisfy: D / 3 < d < D / 2.
[0045] This invention, by defining the relationship between the width D of the polymer film layer and the width d of the adhesive sublayer, essentially limits the width range of the adhesive-free area between the two adhesive sublayers. This not only avoids the significant cutting burr problem caused by an excessively wide adhesive-free area, but also avoids the residual adhesive at the cut point caused by an excessively narrow adhesive-free area.
[0046] In some embodiments, the width of the polymer film is D = 10-30 mm, for example, it can be 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm or 30 mm, but is not limited to the listed values, other unlisted values within this range are also applicable.
[0047] In some embodiments, the width of the adhesive sublayer is d = 4-12 mm, for example, it can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm or 12 mm, but is not limited to the listed values, other unlisted values within this range are also applicable.
[0048] In some embodiments, the two adhesive sublayers have the same width.
[0049] In some embodiments, the thickness of the tape is 20-40 μm, for example, it can be 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 34 μm, 36 μm, 38 μm or 40 μm, but is not limited to the listed values, other unlisted values within this range are also applicable.
[0050] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0051] Example 1
[0052] This embodiment provides an adhesive tape for electrode attachment, such as... Figure 1 As shown, the tape includes a polymer film layer 10 and an adhesive layer 20 stacked together. A cutting aid notch 11 is provided at the center line of the long axis of the polymer film layer 10. Figure 2As shown, with the cutting auxiliary notch 11 as the axis of symmetry, the adhesive layer 20 is divided into two parallel adhesive sub-layers 21, and the outer edge of the adhesive sub-layer 21 coincides with the edge of the polymer film layer 10, thereby reserving a non-adhesive area between the two adhesive sub-layers 21.
[0053] In this embodiment, the polymer film layer 10 is made of polypropylene (PP) with a width D of 20 mm; the adhesive sublayer 21 has a width d of 8 mm, so the width of the reserved adhesive-free area is 4 mm; the cutting auxiliary serrations 11 are arranged in a dotted line pattern, with a distance of 2 mm between adjacent serrations, a length of 1 mm and a width of 0.5 mm for each serration, and a maximum tensile force (breaking tensile force) of 22 N at both ends of the cutting auxiliary serrations 11 at 180°; the thickness of the adhesive tape is 30 μm.
[0054] like Figure 3 As shown, in the square 71173-314Ah winding process, the two electrode sheets 30 are bonded together by applying adhesive tape from top to bottom using the tape provided in this embodiment, and the electrode sheets 30 are fixed by a pressure bar (not shown in the figure). The adhesion width a of the electrode sheet 30 on the tape surface is controlled to be 7mm, and the distance between the two electrode sheets 30 is 6mm.
[0055] like Figure 4 As shown, after the electrode assembly is wound, the tape attached to the electrode sheet 30 is cut from the center using a cutter. The upper and lower tapes are stuck together after cutting, and there is no residual adhesive at the cut.
[0056] Comparative Example 1
[0057] This comparative example provides an adhesive tape for electrode attachment, such as... Figure 5 As shown, the tape includes a polymer film layer 10 and an adhesive layer 20 stacked together. No cutting auxiliary notches 11 are provided at the center line of the long axis of the polymer film layer 10, and the adhesive layer 20 is not applied at intervals. The rest of the structure and conditions are the same as in Example 1, so they will not be described in detail here.
[0058] like Figure 6 As shown, in the square 71173-314Ah winding process, the tape provided in this comparative example is used to bond the two electrode sheets 30 together by applying adhesive from top to bottom, and the electrode sheets 30 are fixed by a pressure bar (not shown in the figure), and the distance between the two electrode sheets 30 is controlled to be 6mm.
[0059] like Figure 7 As shown, after the electrode assembly is wound, the tape attached to the electrode sheet 30 is cut from the center using a cutter. The upper and lower tapes stick together after being cut, but there is residual adhesive at the cut.
[0060] On eight winding machines, the tapes provided in Example 1 and Comparative Example 1 were used respectively, and the cutters of the same material and supplier were used. The number of times the corresponding cutters of Example 1 and Comparative Example 1 were replaced was recorded. The relevant data are shown in Table 1 below.
[0061] Table 1
[0062]
[0063] As shown in Table 1, the cutter life of Example 1 is significantly higher than that of Comparative Example 1.
[0064] Therefore, the tape provided by this utility model, by applying adhesive layers at intervals and adding cutting auxiliary grooves, effectively improves the safety risks caused by cutting burrs, avoids residual adhesive contamination at the cut point, and improves the service life of the cutter.
[0065] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.
Claims
1. A tape for electrode tab attachment, comprising a polymer film layer and an adhesive layer arranged in a stack, characterized in that, A cutting aid notch is provided at the center line of the long axis of the polymer film; With the cutting auxiliary notch as the axis of symmetry, the adhesive layer is divided into two parallel adhesive sub-layers, and the outer edge of the adhesive sub-layer coincides with the edge of the polymer film layer; Let the width of the polymer film be D and the width of the adhesive sublayer be d, then d < D / 2.
2. The adhesive tape for pole piece attachment according to claim 1, wherein If the adhesion width of the electrode on the tape surface is set to a, then d > a.
3. The adhesive tape for pole piece attachment according to claim 2, wherein The cutting auxiliary notches are arranged in a dotted line pattern, and the distance between adjacent notches is 1-3mm.
4. The adhesive tape for pole piece attachment according to claim 3, wherein In the cutting auxiliary notches, the length of a single notch is 0.5-1.5mm, and the width of a single notch is 0.2-0.8mm.
5. The adhesive tape for pole piece attachment according to claim 4, wherein The breaking tensile force of the cutting auxiliary notch is ≥20N.
6. The adhesive tape for pole piece attachment according to any one of claims 1 to 5, wherein The width D of the polymer film and the width d of the viscose sublayer satisfy the following condition: D / 3 < d < D / 2.
7. The adhesive tape for pole piece attachment according to claim 6, wherein The width of the polymer film is D = 10-30 mm.
8. The adhesive tape for pole piece attachment according to claim 7, wherein The width of the adhesive sublayer is d = 4-12 mm.
9. The adhesive tape for pole piece attachment according to claim 8, wherein The two adhesive sublayers have the same width.
10. The adhesive tape for electrode attachment according to any one of claims 1-5, characterized in that, The thickness of the tape is 20-40 μm.