High-temperature-resistant adhesive tape for lithium battery

Abstract

The utility model relates to the technical field of adhesive tapes, and discloses a high-temperature-resistant adhesive tape for a lithium battery, which comprises an adhesive tape body formed by sequentially stacking and connecting a base layer, a heat absorption phase change layer and an adhesive layer. By arranging the heat absorption phase change layer, when the temperature of the lithium battery rises, a large amount of heat can be absorbed by the phase change material and converted into latent heat to be stored, rapid rising of the temperature of the battery is effectively inhibited, the problems of battery performance reduction and service life shortening caused by high temperature are avoided, and the safety and stability of the lithium battery are improved. Meanwhile, the adhesive layer ensures that the adhesive tape is tightly attached to the surface of the battery, it is ensured that heat can be efficiently transferred to the heat absorption phase change layer from the battery, attachment is firm and not prone to falling off, and the good protection effect can be always maintained in the long-term use process of the battery. Besides, the base layer not only provides necessary supporting strength for the structure of the whole adhesive tape body, so that the adhesive tape body is not easy to damage in the pasting and using processes, but also can prevent external impurities from eroding the battery to a certain extent.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of adhesive tape, concretely to a high temperature resistant adhesive tape for lithium battery. BACKGROUND

[0002] Lithium batteries will face many problems when working in high temperature environments, such as rapid capacity decay, internal chemical reaction imbalance, etc., which seriously affect their service life and safety. The role of adhesive tape is not only to fasten the lithium battery, but also to stabilize the operation of the lithium battery in high temperature scenarios.

[0003] The existing adhesive tape still has the following problems: the traditional lithium battery adhesive tape has a simple structure, consisting of a base layer and an adhesive layer. The base layer is mostly P or PET film, which has low cost but limited strength and high temperature resistance, and is prone to soft deformation and poor heat insulation and buffering at high temperatures. The adhesive layer commonly uses conventional pressure-sensitive adhesive, which has adhesion at room temperature and can be pasted on the surface of the battery. However, its temperature resistance is not good, and the adhesion may decrease at high temperatures, easily leading to loose or falling off.

[0004] Therefore, there is an urgent need for a high temperature resistant adhesive tape for lithium battery to solve the above problems. SUMMARY

[0005] Based on the above, the purpose of the utility model is to provide a high temperature resistant adhesive tape for lithium battery to solve the problem of loose and easy falling off of the adhesive tape at high temperature.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme: a high temperature resistant adhesive tape for lithium battery, comprising:

[0007] an adhesive tape body connected in sequence by a base layer, a heat-absorbing phase change layer and an adhesive layer;

[0008] the heat-absorbing phase change layer is used to absorb the heat of the lithium battery;

[0009] the adhesive layer is used to ensure that the adhesive tape is tightly attached to the surface of the battery.

[0010] As a preferred scheme of the high temperature resistant adhesive tape for lithium battery, the surface of the base layer is provided with air holes, and the air holes are provided with a plurality of air holes, which are uniformly distributed on the surface of the base layer.

[0011] As a preferred scheme of the high temperature resistant adhesive tape for lithium battery, the edge of the adhesive tape body is provided with a sealing layer, which is used to ensure the structural integrity and performance stability of the adhesive tape.

[0012] As a preferred scheme of the high temperature resistant adhesive tape for lithium battery, it further comprises a heat insulation layer arranged between the base layer and the heat-absorbing phase change layer, which is used to block heat conduction.

[0013] As a preferred solution of the high-temperature-resistant adhesive tape for lithium batteries, a heat diffusion layer is further arranged between the base layer and the heat-absorbing phase change layer, and the heat diffusion layer is used to quickly and uniformly diffuse the absorbed heat, so as to avoid local overheating.

[0014] As a preferred solution of the high-temperature-resistant adhesive tape for lithium batteries, a transition interface layer is arranged between the base layer and the heat-absorbing phase change layer, and between the heat-absorbing phase change layer and the adhesive layer, and the transition interface layer is used to promote the atomic diffusion and chemical bonding between the two adjacent layers, so as to enhance the bonding force between the layers.

[0015] As a preferred solution of the high-temperature-resistant adhesive tape for lithium batteries, an electromagnetic shielding layer is further arranged between the base layer and the heat-absorbing phase change layer, and the electromagnetic shielding layer is used to shield the electromagnetic interference generated during the charging and discharging process of the lithium battery.

[0016] As a preferred solution of the high-temperature-resistant adhesive tape for lithium batteries, the base layer is composed of a polytetrafluoroethylene fiber woven cloth, and the base layer is used to protect the adhesive tape body and adapt to the shape of the lithium battery.

[0017] As a preferred solution of the high-temperature-resistant adhesive tape for lithium batteries, the heat-absorbing phase change layer is made of paraffin and nano-graphite, and the heat-absorbing phase change layer is used to absorb a large amount of heat, thereby effectively reducing the temperature of the battery surface.

[0018] As a preferred solution of the high-temperature-resistant adhesive tape for lithium batteries, the adhesive layer is made of organic silicon and epoxy copolymer adhesive, and the adhesive layer is used to make the adhesive tape body have the high-temperature resistance of organic silicon and the high-strength bonding performance of epoxy.

[0019] The beneficial effects of the utility model are: through setting heat-absorbing phase change layer, can utilize phase change material to absorb a large amount of heat and convert into latent heat and store up when lithium battery temperature rises, effectively restrain the rapid rise of battery temperature, avoid the problem of battery performance decline, shortened life caused by high temperature, improve the safety and stability of lithium battery. Meanwhile, the adhesive layer ensures that the adhesive tape is closely attached to the battery surface, ensures that heat can be efficiently transferred from the battery to the heat-absorbing phase change layer, and the attachment is firm and not easy to fall off, and good protection effect can be maintained during long-term use of the battery. In addition, the base layer not only provides necessary support strength for the structure of the whole adhesive tape body, so that it is not easy to be damaged during pasting and use, but also can block external impurities from corroding the battery to some extent, further prolonging the service life of the lithium battery. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The utility model provides a kind of high-temperature-resistant adhesive tape for lithium battery whole structure schematic view;

[0021] Figure 2 The whole structure schematic diagram of the high-temperature-resistant adhesive tape for lithium battery provided by the utility model has a surface attached with air holes in the base layer;

[0022] Figure 3 The whole structure schematic diagram of the high-temperature-resistant adhesive tape for lithium battery provided by the utility model has a surface attached with air holes in the base layer;

[0023] Figure 4 The whole structure schematic diagram of the high-temperature-resistant adhesive tape for lithium battery provided by the utility model has a surface attached with air holes in the base layer;

[0024] Figure 5 The whole structure schematic diagram of the high-temperature-resistant adhesive tape for lithium battery provided by the utility model has a surface attached with air holes in the base layer;

[0025] Figure 6 The whole structure schematic diagram of the high-temperature-resistant adhesive tape for lithium battery provided by the utility model has a surface attached with air holes in the base layer;

[0026] Figure 7 The whole structure schematic diagram of the high-temperature-resistant adhesive tape for lithium battery provided by the utility model has a surface attached with air holes in the base layer;

[0027] Figure 8 The whole structure schematic diagram of the high-temperature-resistant adhesive tape for lithium battery provided by the utility model has a surface attached with air holes in the base layer;

[0028] Figure 9 The whole structure schematic diagram of the high-temperature-resistant adhesive tape for lithium battery provided by the utility model has a surface attached with air holes in the base layer.

[0029] Wherein, the reference signs in the drawings: 1, base layer; 2, heat-absorbing phase change layer; 3, adhesive layer; 4, adhesive tape body; 5, air hole; 6, heat insulation layer; 7, buffer layer; 8, heat diffusion layer; 9, heat-conducting coating; 10, electromagnetic shielding layer; 11, protective film; 12, sealing layer. DETAILED DESCRIPTION

[0030] The utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings but not all structures.

[0031] In the description of the utility model, unless another definite provision and limit, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be the communication of two elements inside or the interaction of two elements.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless another definite provision and limit, the first feature is "on" or "under" the second feature can include the direct contact of the first and second features, also can include that the first and second features are not directly contacted but contacted through other features between them.Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the second feature.The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the second feature.

[0033] In the description of the embodiment, the orientation or position relationship of the terms "on", "under", "left", "right" and the like is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.

[0034] In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more than two.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0035] In one embodiment of the utility model, as shown in Figure 1 As shown in the drawing, a high-temperature-resistant adhesive tape for lithium battery is provided, comprising: an adhesive tape body 4 connected by a base layer 1, a heat-absorbing phase change layer 2 and an adhesive layer 3 in sequence;The heat-absorbing phase change layer 2 is used for absorbing the heat of lithium battery;The adhesive layer 3 is used for ensuring that the adhesive tape is closely combined with the surface of the battery.

[0036] The high-temperature resistant tape for lithium batteries provided by this invention, by incorporating a heat-absorbing phase change layer 2, can absorb a large amount of heat and convert it into latent heat when the lithium battery temperature rises. This effectively suppresses the rapid rise in battery temperature, avoiding performance degradation and shortened lifespan caused by high temperatures, and improving the safety and stability of the lithium battery. Simultaneously, the adhesive layer 3 ensures a tight bond between the tape and the battery surface, guaranteeing efficient heat transfer from the battery to the heat-absorbing phase change layer 2. The strong adhesion prevents detachment and maintains good protective performance throughout long-term battery use. Furthermore, the base layer 1 not only provides the necessary structural strength for the entire tape body 4, making it less prone to damage during application and use, but also blocks external impurities from corroding the battery to a certain extent, further extending the lithium battery's lifespan.

[0037] Preferably, the base layer 1 is made of polytetrafluoroethylene (PTFE) fiber woven fabric as the substrate of the tape. PTFE fiber has excellent chemical stability and hardly reacts with any chemicals, which allows the base layer 1 to effectively resist corrosive chemicals that may leak from inside the lithium battery. Its high-temperature resistance is also excellent, allowing for long-term stable use at 260℃. At the same time, the PTFE fiber woven fabric also has good flexibility, facilitating the tape's adhesion to lithium battery surfaces of various shapes, ensuring that the tape body 4 effectively protects the lithium battery.

[0038] like Figure 2 As shown, preferably, the surface of the base layer 1 is provided with vent holes 5, and a plurality of vent holes 5 are evenly distributed on the surface of the base layer 1. Tiny vent holes 5 are evenly distributed on the polytetrafluoroethylene fiber woven fabric. The presence of these vent holes 5 ensures the breathability of the tape in high-temperature environments, preventing heat accumulation due to poor air circulation; furthermore, during the tape application process, it facilitates air expulsion, allowing the tape to adhere more tightly to the battery surface, improving the bonding effect, and ensuring that the tape body 4 can be stably bonded to the lithium battery for a long period.

[0039] Preferably, the heat-absorbing phase change layer 2 is composed of paraffin wax and nano-graphite. Paraffin wax undergoes a phase change when it reaches its melting point, absorbing a large amount of heat and effectively reducing the temperature of the battery surface. The addition of nano-graphite significantly improves the thermal conductivity of the material, allowing heat to be absorbed by the paraffin wax more quickly. When the temperature drops, the paraffin wax solidifies, releasing the absorbed heat, thus creating a cycle that effectively regulates the battery temperature. The heat-absorbing phase change layer 2, composed of paraffin wax and nano-graphite, can precisely and efficiently regulate the lithium battery temperature and, in conjunction with the base layer 1, improves the high-temperature protection reliability of the tape body 4.

[0040] It should be noted that paraffin is usually solid at room temperature, but has a certain flexibility and plasticity. When the temperature rises close to its melting point, paraffin will gradually become soft and more easily deformed. This property enables paraffin to adapt to the shape of the lithium battery to some extent when it comes into contact with the surface of the lithium battery, especially for some relatively simple shape changes. In addition, the addition of nano-graphite not only improves the thermal conductivity of the material, but also helps to improve the mechanical properties of the composite material. Nano-graphite has high flexibility and ductility, which can enhance the deformation ability of paraffin to some extent, making the heat-absorbing phase change layer 2 more easily conform to the shape of the lithium battery after compounding. Moreover, in actual production, the conformability of the heat-absorbing phase change layer 2 can be further improved by adjusting the manufacturing process. For example, by using appropriate forming processes such as molding, coating molding, etc., the heat-absorbing phase change layer 2 can better adapt to the shape of the lithium battery during the manufacturing process. At the same time, by controlling the formula and preparation conditions of the material, the flexibility and adhesion of the heat-absorbing phase change layer 2 can be optimized, so that it can better conform to the surface of the battery, increasing the practicality of the adhesive tape body 4 to conform to lithium batteries of any shape.

[0041] As shown in Figure 3 The high-temperature-resistant adhesive tape for lithium batteries also includes a heat-insulating layer 6 arranged between the base layer 1 and the heat-absorbing phase change layer 2. The heat-insulating layer 6 can effectively block external heat from entering and minimize the impact of heat on the heat-absorbing phase change layer 2, allowing the heat-absorbing phase change layer 2 to function in a more stable temperature range. Since the base layer 1 is usually directly exposed to the external environment, the heat-insulating layer 6 can effectively reduce the impact of external high temperatures on the internal structure of the adhesive tape, prolonging the service life of the adhesive tape body 4.

[0042] As shown in Figure 4 Preferably, a buffer layer 7 can be added between the base layer 1 and the heat-insulating layer 6. The buffer layer 7 can be made of materials with certain heat-insulating properties and flexibility, such as rubber or silicone. Rubber and silicone have relatively low thermal conductivity and good flexibility and elasticity. When heat is transmitted from the base layer 1, the buffer layer 7 can absorb and disperse part of the heat, slowing down the conduction speed of heat to the heat-insulating layer 6. At the same time, the buffer layer 7 can also play a protective role, preventing the base layer 1 from causing physical damage to the heat-insulating layer 6 due to thermal expansion and contraction, etc., ensuring the integrity and heat-insulating effect of the heat-insulating layer 6.

[0043] As shown in Figure 5As shown, the high-temperature-resistant adhesive tape for lithium batteries further comprises a heat diffusion layer 8 arranged between the base layer 1 and the heat-absorbing phase change layer 2. The heat diffusion layer 8 can quickly disperse the heat absorbed by the base layer 1. When external high temperature is transmitted to the base layer 1, the heat diffusion layer 8 can timely and evenly distribute the heat, avoiding excessive local heat. This helps to slow down the phase change speed of the heat-absorbing phase change layer 2, so that it can play a longer temperature regulating role. Moreover, uniform heat distribution is also conducive to protecting the base layer 1 material and avoiding performance degradation due to local overheating, thereby improving the performance of the adhesive tape body 4.

[0044] As shown in Figure 6 Preferably, a layer of heat-conducting coating 9, such as a silver nanowire coating, can be coated on the surface of the base layer 1. Silver nanowires have ultra-high thermal conductivity. By uniformly coating a silver nanowire coating on the surface of the base layer 1, the thermal conductivity of the base layer 1 can be improved, the heat transfer efficiency to the heat diffusion layer 8 can be enhanced, and the effective operation of the heat diffusion layer 8 can be ensured.

[0045] Preferably, a transition interface layer is arranged between the base layer 1 and the heat-absorbing phase change layer 2, and between the heat-absorbing phase change layer 2 and the adhesive layer 3. A nanoscale transition interface layer is formed between the two adjacent layers of materials by plasma treatment technology. This transition interface layer can promote atomic diffusion and chemical bonding between the two adjacent layers of materials, enhance the interlayer bonding force, avoid delamination in high temperature and high pressure environments, and greatly improve the stability and high temperature resistance of the adhesive tape body 4.

[0046] As shown in Figure 7 The high-temperature-resistant adhesive tape for lithium batteries further comprises an electromagnetic shielding layer 10 arranged between the base layer 1 and the heat-absorbing phase change layer 2. This position can first shield external electromagnetic interference and prevent it from penetrating the base layer 1 to affect the internal heat-absorbing phase change layer 2 and adhesive layer 3. For application scenarios that may exist in a strong electromagnetic environment, such as near a new energy vehicle motor, the internal structure of the adhesive tape can be effectively protected from electromagnetic interference, maintaining the stability of the performance of each layer of material. At the same time, if the base layer 1 itself has a certain electrical conductivity, it can cooperate with the electromagnetic shielding layer 10 to enhance the electromagnetic shielding effect of the adhesive tape body 4.

[0047] As shown in Figure 8 Preferably, a dense protective film 11 can be formed on the surface of the base layer 1 by surface passivation treatment to prevent the internal chemical substances of the base layer 1 from contacting the electromagnetic shielding layer 10. For metal base layer 1 materials, an anodization process can be used to generate an oxide film on the surface. This oxide film not only improves the corrosion resistance of the base layer 1, but also reduces the adverse effects on the electromagnetic shielding layer 10.

[0048] Preferably, the adhesive layer 3 uses a silicone-epoxy copolymer adhesive. This adhesive combines the high temperature resistance of silicone and the high strength bonding performance of epoxy. It can still maintain good adhesion at high temperature environment of 200℃, ensuring that the adhesive tape is closely attached to the surface of the battery. And the adhesive has strong adhesion to polytetrafluoroethylene fiber woven cloth and lithium battery shell material, which can effectively prevent the adhesive tape body 4 from falling off during high temperature use.

[0049] As shown in Figure 9 Preferably, the edge of the adhesive tape body 4 is provided with a sealing layer 12. In order to prevent heat from dissipating from the edge of the adhesive tape, and at the same time avoid external impurities from entering, a sealing layer 12 can be provided at the edge of the adhesive tape. By applying a layer of high temperature resistant sealant at the edge, a sealed boundary is formed, ensuring the structural integrity and performance stability of the adhesive tape body 4.

[0050] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above in the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the present application, and any simple modification, equivalent change and modification of the above embodiment within the scope of the present application are all within the scope of the present application.

Claims

1. A high temperature resistant adhesive tape for lithium batteries, characterized by, The utility model relates to a heat-absorbing adhesive tape for lithium battery, comprising: a tape body composed of a base layer, a heat-absorbing phase change layer and an adhesive layer; the heat-absorbing phase change layer is used for absorbing the heat of a lithium battery; the adhesive layer is used for ensuring that the tape closely adheres to the surface of the battery.

2. The high-temperature-resistant adhesive tape for lithium batteries according to claim 1, characterized in that, The surface of the base layer is provided with air-permeable holes, and the air-permeable holes are uniformly distributed on the surface of the base layer.

3. The high-temperature-resistant adhesive tape for lithium batteries according to claim 1 or 2, characterized in that, The edge of the tape body is provided with a sealing layer, which is used for ensuring the structural integrity and performance stability of the tape.

4. The high-temperature-resistant adhesive tape for lithium batteries according to claim 1 or 2, characterized in that, A heat-insulating layer is further arranged between the base layer and the heat-absorbing phase change layer, and the heat-insulating layer is used for blocking heat conduction.

5. The high-temperature-resistant adhesive tape for lithium batteries according to claim 1 or 2, characterized in that, A heat-diffusing layer is further arranged between the base layer and the heat-absorbing phase change layer, and the heat-diffusing layer is used for rapidly and uniformly diffusing the absorbed heat to avoid local overheating.

6. The high-temperature-resistant adhesive tape for lithium batteries according to claim 1 or 2, characterized in that, The base layer and the heat-absorbing phase change layer are connected through a transition interface layer, and the heat-absorbing phase change layer and the adhesive layer are connected through a transition interface layer, and the transition interface layer is used for promoting the atomic diffusion and chemical bonding between the two adjacent layers and enhancing the bonding force between the layers.

7. The high-temperature-resistant adhesive tape for lithium batteries according to claim 1 or 2, characterized in that, An electromagnetic shielding layer is further arranged between the base layer and the heat-absorbing phase change layer, and the electromagnetic shielding layer is used for shielding the electromagnetic interference generated by the lithium battery during charging and discharging.

8. The high-temperature-resistant adhesive tape for lithium batteries according to claim 1 or 2, characterized in that, The base layer is composed of a polytetrafluoroethylene fiber woven cloth, and the base layer is used for protecting the tape body and adapting to the shape of the lithium battery.

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