Insulating tape for lithium battery cell

Abstract

This utility model discloses an insulating tape for lithium battery cells. The utility model includes: a multi-layer composite insulating tape with an indicator label at its outermost end. The multi-layer composite insulating tape comprises, from bottom to top, a release layer, a functional adhesive layer, a composite substrate layer, and a protective coating. The indicator label is adhered to the bottom surface of the release layer. The release layer is a biaxially oriented polypropylene film coated with silicone. The functional adhesive layer is composed of a high-temperature resistant pressure-sensitive adhesive and a phase change thermally conductive adhesive. The composite substrate layer is composed of a polyimide film and a polyurethane sponge layer. The protective coating is a nano-titanium dioxide-fluorocarbon resin composite coating. This multi-layer composite insulating tape, composed of the release layer, functional adhesive layer, composite substrate layer, and protective coating, can adapt to complex environments such as high temperature and high humidity. It also exhibits good flexibility, is less prone to bubbles and wrinkles, and has good chemical corrosion resistance and aging resistance.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery auxiliary materials technology, specifically to an insulating tape for lithium battery cells. Background Technology

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. In the production, manufacturing and application of lithium batteries, the insulation protection of the battery cell is crucial.

[0003] Existing insulating tapes for lithium battery cells generally have several shortcomings. While some insulating tapes possess certain insulation properties, these properties rapidly degrade under complex environments such as high temperature and high humidity, failing to provide continuous and reliable protection for the battery cells. Furthermore, most insulating tapes lack flexibility, making it difficult to tightly adhere to the complex shape and structure of the battery cells, easily leading to air bubbles and wrinkles, causing localized protection failure. In addition, existing insulating tapes perform poorly in terms of chemical corrosion resistance and aging resistance, and after long-term use, problems such as adhesive layer peeling and substrate damage are prone to occur, affecting the safety and lifespan of the lithium battery. Utility Model Content

[0004] The purpose of this invention is to provide an insulating tape for lithium battery cells to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an insulating tape for lithium battery cells, comprising: a multi-layer composite insulating tape, wherein an indicator label is provided at the outermost end of the multi-layer composite insulating tape, the multi-layer composite insulating tape comprising, from bottom to top, a release layer, a functional adhesive layer, a composite substrate layer and a protective coating, wherein the indicator label is adhered to the bottom surface of the release layer, the release layer is a biaxially oriented polypropylene film coated with silicone, the functional adhesive layer is composed of a high-temperature pressure-sensitive adhesive and a phase change thermally conductive adhesive, the composite substrate layer is composed of a polyimide film and a polyurethane sponge layer, and the protective coating is a nano-titanium dioxide-fluorocarbon resin composite coating.

[0006] Furthermore, the release layer has a thickness of 30-50 μm and a release force of 10-30 gf / 25 mm.

[0007] Furthermore, the high-temperature pressure-sensitive adhesive uses organosilicon acrylate copolymer as the main resin and adds nano-alumina filler with a thickness of 20-40μm, while the phase change thermally conductive adhesive uses paraffin-based phase change material as the matrix and is doped with graphene nanosheets with a thickness of 15-30μm.

[0008] Furthermore, the polyimide film has a thickness of 15-30 μm, and the polyurethane sponge layer has a thickness of 20-40 μm.

[0009] Furthermore, the thickness of the protective coating is 5-10 μm.

[0010] Furthermore, the inner side of the multi-layer composite insulating tape is provided with a retaining ring, an inner ring, and a support ring. The multi-layer composite insulating tape is bonded to the periphery of the retaining ring and the support ring, and the inner ring is rotatably connected to the inner side of the retaining ring and the support ring.

[0011] Furthermore, the upper end of the support ring is provided with an annular groove, and a limiting ring is fixedly connected to the circumferential side of the inner ring, the limiting ring being rotatably connected inside the annular groove.

[0012] Furthermore, the upper end of the support ring is provided with a socket, and multiple sets of sockets are provided. The bottom of the retaining ring is fixedly connected with a rod, and multiple sets of rods are provided. The rods are slidably connected inside the socket.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model uses a multi-layer composite insulating tape composed of a release layer, a functional adhesive layer, a composite substrate layer, and a protective coating. It can adapt to complex environments such as high temperature and high humidity, while having good flexibility and being less prone to bubbles and wrinkles. In addition, it has good chemical corrosion resistance and aging resistance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front view structure in one embodiment of the present invention;

[0016] Figure 2 for Figure 1 A cross-sectional view of the multilayer composite insulating tape;

[0017] Figure 3 for Figure 1 A schematic diagram of the exploded structure of the middle ring and the inner ring.

[0018] Reference numerals: 1. Multi-layer composite insulating tape; 11. Release layer; 12. Functional adhesive layer; 13. Composite substrate layer; 14. Protective coating; 2. Indicator label; 3. Retaining ring; 31. Insert rod; 4. Inner ring; 41. Limiting ring; 5. Support ring; 51. Ring groove; 52. Insertion hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please refer to the following: Figures 1-3 ,in Figure 1 This is a schematic diagram of the front view structure in one embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional view of the multilayer composite insulating tape; Figure 3 for Figure 1 A schematic diagram of the exploded structure of the inner and outer rings. An insulating tape for lithium battery cells includes: a multi-layer composite insulating tape 1, with an indicator label 2 at its outermost end. The multi-layer composite insulating tape 1 includes, from bottom to top, a release layer 11, a functional adhesive layer 12, a composite substrate layer 13, and a protective coating 14. The indicator label 2 is adhered to the bottom surface of the release layer 11. The release layer 11 is a biaxially oriented polypropylene film coated with silicone. The functional adhesive layer 12 is composed of a high-temperature resistant pressure-sensitive adhesive and a phase change thermally conductive adhesive. The composite substrate layer 13 is composed of a polyimide film and a polyurethane sponge layer. The protective coating 14 is a nano-titanium dioxide-fluorocarbon resin composite coating. The silicone coating... Its surface has low surface energy, allowing for easy peeling without damaging the adhesive layer, facilitating the application of the insulating tape during battery cell assembly. The polyimide film possesses excellent electrical insulation, high-temperature resistance, and chemical stability, effectively isolating the battery cell from external electric field interference. The polyurethane sponge layer, with its porous structure, provides excellent flexibility and cushioning, allowing it to tightly adhere to the battery cell surface, filling gaps, eliminating bubbles and wrinkles, and providing cushioning protection against external impacts. Nano-titanium dioxide exhibits good UV resistance and self-cleaning ability, resisting the aging effects of UV radiation on the insulating tape and maintaining its stable appearance and performance. Fluorocarbon resin imparts excellent chemical corrosion resistance to the coating, giving the insulating tape strong resistance to organic solvents, acidic and alkaline solutions. The combined protective coating 14 effectively improves the environmental adaptability and service life of the insulating tape.

[0021] The release layer 11 has a thickness of 30-50μm and a release force of 10-30gf / 25mm.

[0022] The high-temperature pressure-sensitive adhesive uses organosilicon acrylate copolymer as the main resin and adds nano alumina filler, with a thickness of 20-40μm. The phase change thermally conductive adhesive uses paraffin-based phase change material as the matrix and is doped with graphene nanosheets, with a thickness of 15-30μm.

[0023] The polyimide film has a thickness of 15-30 μm, and the polyurethane foam layer has a thickness of 20-40 μm.

[0024] The protective coating 14 has a thickness of 5-10 μm.

[0025] The inner side of the multi-layer composite insulation tape 1 is provided with a retaining ring 3, an inner ring 4 and a support ring 5. The multi-layer composite insulation tape 1 is bonded to the periphery of the retaining ring 3 and the support ring 5. The inner ring 4 is rotatably connected to the inner side of the retaining ring 3 and the support ring 5. The cooperation between the inner ring 4 and the support ring 5 facilitates the rotation of the multi-layer composite insulation tape 1, thereby facilitating the rotation and feeding of the multi-layer composite insulation tape 1.

[0026] The upper end of the support ring 5 has an annular groove 51, and the inner ring 4 is fixedly connected to the side of the ring 4. The limit ring 41 is rotatably connected inside the annular groove 51.

[0027] The upper end of the support ring 5 is provided with a socket 52, and multiple sets of sockets 52 are provided. The bottom of the retaining ring 3 is fixedly connected with a rod 31, and multiple sets of rods 31 are provided. The rod 31 is slidably connected inside the socket 52. The periphery of the rod 31 is coated with anti-slip paint. By inserting the rod 31 into the socket 52, the inner ring 4 can be limited between the retaining ring 3 and the support ring 5.

[0028] In summary, the insulating tape for lithium battery cells provided by this utility model combines high-temperature resistant pressure-sensitive adhesive with phase change thermally conductive adhesive during operation. This achieves a strong bond between the tape and the battery cell, while also absorbing heat through the phase change material and efficiently conducting heat through graphene, thus solving the thermal management problem of the battery cell. At the same time, nano-alumina enhances the insulation performance, breaking through the limitations of the single function of traditional tapes. The substrate, which is a composite of polyimide film and polyurethane sponge layer, combines the high insulation and high temperature resistance of polyimide with the flexible, conforming, and buffering properties of polyurethane sponge. It can closely conform to the complex shape of the battery cell, providing all-round protection and avoiding the problem of local protection failure. Nano-titanium dioxide-fluorocarbon resin significantly improves the stability and durability of the insulating tape in complex environments by addressing both UV aging resistance and chemical corrosion resistance, thus extending the overall service life of the lithium battery.

[0029] Insert the limiting ring 41 into the ring groove 51, and then insert the insertion rod 31 into the insertion hole 52. At this time, the limiting ring 41 can be limited inside the ring groove 51 by the retaining ring 3. At this time, the inner ring 4 can rotate between the retaining ring 3 and the support ring 5 through the limiting ring 41. The rotation between the inner ring 4 and the support ring 5 can facilitate the rotation and feeding of the multi-layer composite insulation tape 1.

Claims

1. An insulating tape for lithium battery cells, characterized in that, include: A multi-layer composite insulating tape (1) is provided with an indicator label (2) at its outermost end. The multi-layer composite insulating tape (1) includes a release layer (11), a functional adhesive layer (12), a composite substrate layer (13), and a protective coating (14) arranged sequentially from bottom to top. The indicator label (2) is adhered to the bottom surface of the release layer (11). The release layer (11) is a biaxially oriented polypropylene film coated with silicone. The composite substrate layer (13) is composed of a polyimide film and a polyurethane sponge layer. The protective coating (14) is a nano-titanium dioxide-fluorocarbon resin composite coating.

2. The insulating tape for lithium battery cells according to claim 1, characterized in that, The release layer (11) has a thickness of 30-50 μm and a release force of 10-30 gf / 25 mm.

3. The insulating tape for lithium battery cells according to claim 2, characterized in that, The polyimide film has a thickness of 15-30 μm, and the polyurethane sponge layer has a thickness of 20-40 μm.

4. The insulating tape for lithium battery cells according to claim 3, characterized in that, The protective coating (14) has a thickness of 5-10 μm.

5. The insulating tape for lithium battery cells according to claim 4, characterized in that, The multi-layer composite insulating tape (1) is provided with a retaining ring (3), an inner ring (4) and a support ring (5) on its inner side. The multi-layer composite insulating tape (1) is bonded to the circumferential side of the retaining ring (3) and the support ring (5). The inner ring (4) is rotatably connected to the inner side of the retaining ring (3) and the support ring (5).

6. The insulating tape for lithium battery cells according to claim 5, characterized in that, The upper end of the support ring (5) is provided with an annular groove (51), and the inner ring (4) is fixedly connected to a limiting ring (41) on its circumferential side. The limiting ring (41) is rotatably connected inside the annular groove (51).

7. The insulating tape for lithium battery cells according to claim 6, characterized in that, The upper end of the support ring (5) is provided with a socket (52), and multiple sets of sockets (52) are provided. The bottom of the retaining ring (3) is fixedly connected with a plug rod (31), and multiple sets of plug rods (31) are provided. The plug rod (31) is slidably connected inside the socket (52).

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