Adhesive tape, battery cell and battery pack

Abstract

The utility model provides an adhesive tape, a battery cell and a battery pack, the adhesive tape comprises an adhesive layer and a base material layer which are sequentially laminated from inside to outside, a micro-nano structure is formed on the other surface of the adhesive layer relative to the base material layer, the micro-nano structure comprises a plurality of concave parts and convex parts, and the sizes of the concave parts and the convex parts are between the nanometer level and the micrometer level. According to the adhesive tape disclosed by the utility model, the micro-nano structure is arranged on the surface of the adhesive layer, and the sizes of the concave part and the convex part are between the nano level and the micron level, so that air can enter the space between the concave part and the convex part, the contact cross section between water vapor and the air is increased, and the contact area between the water vapor and the adhesive layer is reduced; the damp-proof effect of the adhesive tape is further improved, and the use performance of the adhesive tape is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, especially relates to a kind of adhesive tape;Meanwhile, the utility model also relates to a kind of battery cell with the adhesive tape, and a kind of battery pack with the battery cell. BACKGROUND

[0002] In recent years, with the rapid development of new energy battery technology, the development of new energy electric vehicle industry is promoted. As the core of new energy battery, the safety of battery cell is the key to affect new energy electric vehicle. Adhesive tape is used inside battery cell, for example, in the welding process of battery tab, adhesive tape is often used to fix electrode sheet and tab, so as to ensure welding quality and stability. Different types and specifications of adhesive tape will affect the welding effect and service life.

[0003] But the moisture-proof effect of the adhesive tape is poor during conveying, especially in humid weather such as rain, water molecules occupy the action site of the object surface and the glue, so as to reduce the peel strength of the adhesive tape, so that the adhesive tape is easy to fall off, which seriously affects the use performance of the adhesive tape. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims at providing an adhesive tape to improve the moisture-proof effect.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] An adhesive tape, comprising a glue layer and a substrate layer arranged in sequence from inside to outside, a micro-nano structure is formed on the other surface of the glue layer relative to the substrate layer, the micro-nano structure comprises a plurality of concave parts and convex parts, and the size of the concave parts and the convex parts is between nanometer level and micrometer level.

[0007] Further, the micro-nano structure is formed on the glue layer by plasma etching process.

[0008] Further, the waterproof layer adopts any one of fluoride, sulfide and epoxy resin.

[0009] Further, the substrate layer is any one of polypropylene, polyethylene terephthalate and polyimide.

[0010] Further, the thickness d1 of the glue layer satisfies: 15 μm≤d1≤25 μm; and / or, the thickness d2 of the micro-nano structure satisfies: 5 μm≤d2≤10 μm.

[0011] Further, the outer side of the substrate layer is sequentially provided with a waterproof layer and a release agent layer.

[0012] Further, the thickness d3 of the release agent layer satisfies: 5um≤d3≤10um; and / or, the thickness d4 of the waterproof layer satisfies: 5um≤d4≤10um.

[0013] Compared with the prior art, the utility model has following advantages:

[0014] The adhesive tape has the micro-nano structure on the surface of the adhesive layer, the size of the concave part and the convex part is between the nanometer level and the micrometer level, air enters between the concave part and the convex part, the contact section of the water vapor and the air is increased, the contact area between the water vapor and the adhesive layer is reduced, the moisture-proof effect of the adhesive tape is improved, and the use performance of the adhesive tape is improved.

[0015] The micro-nano structure is formed on the adhesive layer through the plasma etching process, the micro-nano structure is formed conveniently, and the forming effect is good. The fluoride, the sulfide and the epoxy resin have good waterproof performance. The polypropylene, the polyethylene terephthalate and the polyimide are used as the base material layer, the use performance of the adhesive tape is improved, and the adhesive tape is easy to process. The thickness of the adhesive layer is set, the adhesive strength requirement of the adhesive tape is met, the thickness range of the micro-nano structure is set, and the waterproof effect of the micro-nano structure is ensured. The waterproof layer is set, the moisture-proof performance of the adhesive tape is improved. The thickness of the release agent layer is set, the use requirement of the adhesive tape is met, the thickness of the waterproof layer is set, the waterproof requirement is met, and the weight of the adhesive tape is reduced. The thickness range of the base material layer is set, and the use performance of the adhesive tape is ensured.

[0016] In addition, another purpose of the utility model is to provide a battery cell, which comprises a pole group with a pole lug and an electric connecting sheet connected to the pole lug by welding, and the electric connecting sheet and the pole lug are bonded with the adhesive tape.

[0017] The battery cell has the adhesive tape, and the use performance of the battery cell is improved.

[0018] The battery pack has the battery cell, and the use performance of the battery pack is improved. ACCURACY

[0019] The drawings that form a part of the utility model are used to provide further understanding of the utility model, the illustrative embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation to the utility model.

[0020] Figure 1The structure diagram of the adhesive tape is shown in the embodiment of the utility model.

[0021] Mark explanation:

[0022] 1, glue layer; 2, substrate layer; 3, waterproof layer; 4, release agent layer;

[0023] 101, micro-nano structure. Specific implementation

[0024] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0025] In the description of the utility model, it should be noted that if the terms such as "upper", "lower", "inner", "back" and the like indicating orientation or positional relationship appear, it is based on the orientation or positional relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, if the terms such as "first", "second" appear, they are also used for description purposes only, and cannot be understood as indicating or implying relative importance.

[0026] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0027] The embodiment relates to an adhesive tape, to solve the problem that the adhesive tape for battery cell in the prior art is easy to enter moisture during transportation, resulting in poor moisture-proof effect and affecting use performance.

[0028] In terms of overall structure, the adhesive tape in the embodiment comprises a glue layer 1 and a substrate layer 2 which are sequentially stacked from inside to outside, and a micro-nano structure 101 is formed on the other surface of the glue layer 1 relative to the substrate layer 2, the micro-nano structure 101 comprises a plurality of concave parts and convex parts, and the size of the concave parts and the convex parts is between nanometer level and micrometer level.

[0029] The adhesive tape described in the embodiment can make air enter between the concave parts and the convex parts by arranging the micro-nano structure 101 on the surface of the glue layer 1, and the size of the concave parts and the convex parts is between nanometer level and micrometer level, so as to facilitate increasing the water vapor and air contact cross section and reducing the contact area between the water vapor and the glue layer 1, further facilitating improving the moisture-proof effect of the adhesive tape and further improving the use performance of the adhesive tape.

[0030] Based on the overall introduction as above, one exemplary structure of the adhesive tape described in the embodiment is as shown in the following table: Figure 1The outer side of the substrate layer 2 is sequentially provided with a waterproof layer 3 and a release agent layer 4, and the waterproof layer 3 also helps to improve the waterproof performance of the adhesive tape. Among them, the thickness d1 of the adhesive layer 1 satisfies: 15μm≤d1≤25μm, and the thickness d2 of the micro-nano structure 101 satisfies: 5μm≤d2≤10μm. When the thickness of the adhesive layer 1 is less than 15μm, the thickness of the adhesive layer 1 is too thin, and the bonding strength cannot be guaranteed. When the thickness of the adhesive layer 1 is greater than 25μm, it will cause the function of the adhesive layer 1 to be excessive, and thus increase the production cost of the adhesive tape. When the thickness of the micro-nano structure 101 is less than 5μm, the hydrophobic effect is not obvious, and when the thickness of the micro-nano structure 101 is greater than 10μm, it will affect the bonding strength of the adhesive layer 1.

[0031] In specific implementation, the thickness d1 of the adhesive layer 1 may be, for example, 15μm, 18μm, 20μm, 22μm, 24μm, or 25μm, etc. The thickness d2 of the micro-nano structure 101 may be, for example, 5μm, 6μm, 7μm, 8μm, 9μm, or 10μm, etc.

[0032] In this embodiment, the plurality of recesses in the micro-nano structure 101 are specifically formed between adjacent convex portions, and the thickness of the micro-nano structure 101 is specifically the height of the convex portion. The size of the recess and the convex portion is between the nanometer level and the micrometer level, which means that the diameter of the recess and the diameter of the convex portion are both between the nanometer level and the micrometer level. Among them, the nanometer level refers to the nanometer scale, which means the size of the material structure is between 1 nanometer (nm) and 100 nanometers. The micrometer level also refers to the micrometer scale, which means the size of the material structure is between 1 micrometer (μm) and 1 millimeter (mm).

[0033] In this embodiment, the diameter of the recess and the convex portion can be between 100nm and 1μm. For example, the diameter of both is 100nm, 400nm, 900nm, or 1μm, etc. In specific implementation, the size of the recess and the convex portion can be determined according to the use requirements.

[0034] As a preferred embodiment, the micro-nano structure 101 in this embodiment is formed on the adhesive layer 1 by the existing plasma etching process. Here, the micro-nano structure 101 is formed on the adhesive layer 1 by the plasma etching process, which is beneficial to the formation of the micro-nano structure 101 and has good forming effect. Among them, the basic principle of the plasma etching process is to excite the specific gas in the chamber to generate a plasma containing high-energy particles through an external electromagnetic field. These high-energy particles remove the material on the surface of the material through physical sputtering or chemical reaction to generate volatile products, thereby forming the recess and convex structure.

[0035] In the embodiment, the waterproof layer 3 is made of any one of fluoride, sulfide and epoxy resin. This is conducive to ensuring the waterproof effect of the waterproof layer 3. In specific implementation, for example, the waterproof layer 3 can be made of any one of perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA), fluoroalkane sulfonic acid (FAS) and fluoroalkane sulfonic acid (FOS).

[0036] The substrate layer 2 is made of any one of polypropylene, polyethylene terephthalate and polyimide. This is also conducive to improving the use performance of the adhesive tape and easy to process. The polypropylene, polyethylene terephthalate and polyimide all have excellent corrosion resistance, good mechanical strength, excellent heat aging performance, excellent self-fusion and air tightness, simple operation and environmental protection.

[0037] In addition, the thickness d3 of the release agent layer 4 satisfies 5 μm≤d3≤10 μm, the thickness d4 of the waterproof layer 3 satisfies 5 μm≤d4≤10 μm. The thickness d5 of the substrate layer 2 satisfies 20 μm≤d5≤30 μm. When the thickness d3 of the release agent layer 4 is less than 5 μm, the release effect of the release agent layer 4 is not obvious, and when the thickness d3 of the release agent layer 4 is greater than 10 μm, the production cost is increased. When the thickness of the waterproof layer 3 is less than 5 μm, the waterproof effect is not obvious, and when the thickness d3 of the waterproof layer 3 is greater than 10 μm, the production cost of the entire adhesive tape is also increased. When the thickness d5 of the substrate layer 2 is less than 20 μm, the strength of the entire adhesive tape is low, and when the thickness d5 of the substrate layer 2 is greater than 30 μm, the production cost of the entire adhesive tape is also increased.

[0038] In the embodiment, the waterproof layer 3 is coated on the substrate and dried, and then the release agent is coated on the dried waterproof layer 3 to form the release agent layer 4.

[0039] In the embodiment, the adhesive tape optimizes the structure of each layer and sets the micro-nano structure 101 on the adhesive layer 1. The air enters between the concave part and the convex part, which is conducive to increasing the contact cross section of water vapor and air, thereby reducing the contact area between water vapor and the adhesive layer 1, further improving the moisture-proof effect of the adhesive tape, thereby reducing the influence of water vapor in the air on the adhesive tape during storage and transportation, and further ensuring the use performance of the adhesive tape.

[0040] In addition, the embodiment also relates to a battery cell, which comprises a pole group with a pole lug and an electric connection sheet connected to the pole lug by welding, and the electric connection sheet and the pole lug are bonded with the adhesive tape as described above. The adhesive tape is specifically used for fixing the electrode sheet and the pole lug, so as to ensure the welding quality and stability between the two.

[0041] The battery cell described in the embodiment is provided with the adhesive tape as described above, which is conducive to improving the use performance of the battery cell.

[0042] In addition, the embodiment also relates to a battery pack comprising the battery cell as described above.

[0043] The battery pack described in the embodiment is beneficial to improving the use performance of the battery pack by arranging the battery cell.

[0044] The above merely describes preferred embodiments of the utility model and is not intended to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1.A tape, characterized in that: comprising a glue layer and a substrate layer arranged in sequence from inside to outside, a micro-nano structure is formed on the other surface of the glue layer relative to the substrate layer, the micro-nano structure comprises a plurality of concave parts and convex parts, the concave parts are formed between adjacent plurality of the convex parts, and the size of the concave parts and the convex parts is between nanometer and micrometer; the outer side of the substrate layer is sequentially provided with a waterproof layer and a release agent layer. 2.The tape according to claim 1, characterized in that: the micro-nano structure is formed on the glue layer by a plasma etching process. 3.The tape according to claim 1, characterized in that: the waterproof layer adopts any one of fluoride, sulfide and epoxy resin. 4.The tape according to claim 1, characterized in that: the substrate layer is any one of polypropylene, polyethylene terephthalate and polyimide. 5.The tape according to claim 1, characterized in that: the thickness d1 of the glue layer satisfies 15 μm≤d1≤25 μm; and / or, the thickness d2 of the micro-nano structure satisfies 5 μm≤d2≤10 μm. 6.The tape according to claim 1, characterized in that: the thickness d3 of the release agent layer satisfies 5 μm≤d3≤10 μm; and / or, the thickness d4 of the waterproof layer satisfies 5 μm≤d4≤10 μm. 7.The tape according to any one of claims 1 to 6, characterized in that: the thickness d5 of the substrate layer satisfies 20 μm≤d5≤30 μm. 8.An electric core, characterized in that: comprising a pole group with a tab, and an electric connecting sheet connected with the tab by welding, and the electric connecting sheet and the tab are bonded with the tape according to any one of claims 1 to 6. 9.A battery pack, characterized in that: comprising the electric core according to claim 8. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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