A novel high-heat-dissipation energy storage device cable and a preparation method thereof

Abstract

The application relates to the cable field and discloses a novel high-heat-dissipation energy storage device cable and a preparation method thereof. The novel high-heat-dissipation energy storage device cable comprises, from inside to outside, a core, a cross-linked polyethylene insulation layer, a shielding layer, a filling layer, an inner protective layer, an armored layer and an outer protective layer. The filling layer is filled with a composite phase change material. The composite phase change material comprises binary eutectic material, cross-linked polyurethane, graphene powder and modified spherical alumina. The cross-linked polyurethane is prepared by using PEG6000, diphenyl methane diisocyanate and boric acid as raw materials. The modified spherical alumina is prepared by grafting a modified silane coupling agent on the surface of spherical alumina through a thiol-alkene click reaction between triallyl isocyanurate and 3-mercapto propyl triethoxysilane. The filling layer filled with the composite phase change material has the characteristics of good heat conductivity, high phase change latent heat, wide phase change temperature range, good thermal cycle stability and good flame retardance.

Description

Technical Field

[0001] This invention belongs to the field of cable technology, specifically relating to a novel high-heat-dissipation energy storage device cable and its preparation method. Background Technology

[0002] When cables are in operation, the conductors dissipate heat, and how to quickly cool the conductors is a pressing problem to be solved. Heat-dissipating cables are commonly used in industrial or electronic equipment to effectively dissipate heat from the cable itself, preventing overheating. This type of cable is typically used in environments requiring long-term operation. High-intensity operation can cause the cable itself to heat up, and the heat dissipation function effectively protects the equipment and the cable itself, reducing the impact of high temperatures on the cable's lifespan and operational stability. Existing heat-dissipating cables typically employ special materials and structural designs to ensure normal operation under high-temperature conditions and to effectively dissipate heat, maintaining the normal operation of the cable and equipment.

[0003] However, in existing technologies, the heat dissipation function of cables is usually concentrated on the outer sheath. Due to prolonged use, the cable core generates a large amount of heat, which is transferred to the outer protective layer before being dissipated. This results in low heat dissipation efficiency, and the high temperature also affects the cable's transmission efficiency. In power systems, phase change materials (PCMs) are widely used in thermal energy storage as a new energy source. Among them, solid-liquid PCMs maintain volume stability before and after the phase change and have a higher energy storage density, making them an ideal choice for energy storage materials. However, their leakage and flammability limit their application, and their inherent low thermal conductivity greatly restricts their practical application range. Summary of the Invention

[0004] To address the shortcomings mentioned in the background art, the present invention aims to provide a novel high-heat-dissipation energy storage device cable and its preparation method. The filler layer formed by the composite phase change material has the characteristics of good thermal conductivity, high latent heat of phase change, and wide phase change temperature range, while also possessing good thermal cycling stability and flame retardant properties.

[0005] The objective of this invention can be achieved through the following technical solutions: A novel high-heat-dissipation energy storage cable includes, from the inside out, a conductor core, a cross-linked polyethylene insulation layer, a shielding layer, a filling layer, an inner sheath, an armor layer, and an outer sheath. The filling layer is made of a composite phase change material, which includes the following components by weight: 25-30 parts of binary eutectic material, 20-24 parts of cross-linked polyurethane, 0.5-1.2 parts of graphene powder, and 3.5-8 parts of modified spherical alumina. The crosslinked polyurethane is made from PEG6000, diphenylmethane diisocyanate and boric acid; the modified spherical alumina is made by grafting a modified silane coupling agent prepared by the thiol-ene click reaction of triallyl isocyanurate and 3-mercaptopropyltriethoxysilane onto the surface of the spherical alumina.

[0006] Preferably, the preparation method of the composite phase change material includes the following steps: A. Add lauric acid and palmitic acid to the reactor, seal it, and place it in an 80°C constant temperature water bath to melt and stir until the mixture is uniform. Cool to room temperature to prepare a binary eutectic material. B. Add pre-dried PEG6000 to the reactor and melt it under heating at 80°C. Then add diphenylmethane diisocyanate and dibutyltin dilaurate and react at 80°C for 3-5 hours. Then add boric acid and continue the reaction for 2-3 hours to prepare cross-linked polyurethane. C. Weigh each component according to the weight parts, add the binary eutectic material to the reactor, place it in an oven to melt, set the temperature to 80℃, keep it in a completely melted state for 30 minutes, then add the mixture of graphene powder and modified spherical alumina, stir and disperse evenly, then slowly add it to the crosslinked polyurethane, continue stirring for 30 minutes, and then place it in an 80℃ oven to cure for 24 hours to prepare the composite phase change material.

[0007] Preferably, the mass ratio of lauric acid to palmitic acid in step A is 3.4~3.5:1.

[0008] Preferably, in step B, the mass ratio of PEG6000, diphenylmethane diisocyanate and boric acid is 20~25:1.5~1.8:0.08~0.2.

[0009] Preferably, the method for preparing modified spherical alumina in step C includes the following steps: C1. Add triallyl isocyanurate and dichloromethane to the reactor, stir and mix, then add a mixed solution of 3-mercaptopropyltriethoxysilane, triethylamine and dichloromethane, stir and react for 18 h to prepare the modified silane coupling agent. C2. Spherical alumina was ultrasonically dispersed in a mixed solution of ethanol and deionized water. The pH of the system was adjusted to 4 using glacial acetic acid. Then, a modified silane coupling agent was added, and the mixture was stirred at 60-75°C for 7-9 hours. After the reaction was completed, the mixture was centrifuged, washed, and dried to obtain modified spherical alumina.

[0010] Preferably, the spherical alumina is formed by mixing spherical alumina with particle sizes of 2µm, 5µm, 30µm, and 70µm in a mass ratio of 1:1:1.3:1.7.

[0011] Preferably, the shielding layer is an aluminum-plastic composite tape shielding layer and a copper wire braided shielding layer.

[0012] Preferably, the inner and outer protective layers are made of polyolefin materials.

[0013] Preferably, the armor layer is a steel strip armor layer.

[0014] The method for preparing the novel high-heat-dissipation energy storage device cable as described above includes the following steps: S1. A copper rod is drawn using a wire drawing machine to obtain copper wire, which is then annealed to obtain a conductor. Then, at least two of the conductors are twisted together to obtain a conductor core. S2. Extrude a cross-linked polyethylene insulation layer onto the outer surface of the conductor core using an extruder; S3. Take aluminum-plastic composite tape and wrap it around the outer surface of cross-linked polyethylene insulation layer to obtain the first shielding layer. Take copper wire and cross-weave it on the outer surface of the first shielding layer to obtain the second shielding layer. S4. A composite phase change material is used to fill the outside of the second shielding layer to form a filling layer; S5. Extruding polyolefin material onto the outside of the filler layer to form an inner protective layer; S6. Wrap a steel strip armor layer around the outer side of the inner protective layer; S7. A new type of high heat dissipation energy storage equipment cable is prepared by extruding polyolefin material on the outside of the steel strip armor layer to form an outer sheath.

[0015] The beneficial effects of this invention are: This invention uses a melt blending method to prepare a lauric acid-palmitic acid binary eutectic material as a phase change material. Simultaneously, using PEG6000, diphenylmethane diisocyanate, and boric acid as raw materials, a cross-linked polyurethane with phase change function is prepared to encapsulate the binary eutectic material. Two-dimensional sheet-like graphene powder and modified spherical alumina of different particle sizes are introduced to improve the thermal conductivity of the phase change material, resulting in a composite phase change material with good thermal conductivity, high latent heat of phase change, wide phase change temperature range, and high thermal stability. This invention utilizes the solid-liquid phase change characteristics of lauric acid-palmitic acid binary eutectic materials to absorb or release a large amount of latent heat during cable load fluctuations, effectively suppressing a sharp rise in internal cable temperature, delaying thermal aging of cable materials, and extending cable service life. Furthermore, due to the porous structure of the cross-linked polyurethane network, small molecules of the binary eutectic material can permeate and be bound within the polyurethane network structure, preventing macroscopic leakage or migration after multiple phase change cycles. Simultaneously, the cross-linked structure imparts a certain degree of elasticity and resistance to compressive deformation to the filler layer, adapting to thermal expansion and contraction during cable bending, laying, and operation. The addition of layered graphene powder and modified spherical alumina constructs thermal conductivity pathways within the phase change matrix, improving thermal conductivity and enabling better cable core production. The generated heat can be transferred to the phase change material more quickly and stored or released, avoiding local overheating. The modified spherical alumina is prepared by grafting a modified silane coupling agent, which is obtained by the thiol-ene click reaction of triallyl isocyanurate and 3-mercaptopropyltriethoxysilane, onto the surface of the spherical alumina, thereby enhancing the interfacial bonding force between the spherical alumina and the matrix material. The spherical alumina is graded with particle sizes of 2µm, 5µm, 30µm, and 70µm to achieve higher filler packing density and more thermally conductive contacts, while improving the overall mechanical uniformity of the matrix material. In addition, nitrogen-boron-silicon elements with synergistic flame retardancy are introduced into the composite phase change material, giving the matrix material good flame retardant properties. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the new high heat dissipation energy storage device cable of the present invention.

[0018] In the diagram: 1-Conductor core, 2-Cross-linked polyethylene insulation layer, 3-Shielding layer, 4-Filling layer, 5-Inner sheath, 6-Armor layer, 7-Outer sheath. Detailed Implementation

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

[0020] like Figure 1 As shown, a novel high-heat-dissipation energy storage device cable includes, from the inside out, a conductor core 1, a cross-linked polyethylene insulation layer 2, a shielding layer 3, a filling layer 4, an inner sheath 5, an armor layer 6, and an outer sheath 7. Its preparation method includes the following steps: S1. A copper rod is drawn using a wire drawing machine to obtain copper wire, which is then annealed to obtain a conductor. Then, at least two of the conductors are twisted together to obtain a conductor core. S2. Extrude a cross-linked polyethylene insulation layer onto the outer surface of the conductor core using an extruder; S3. Take aluminum-plastic composite tape and wrap it around the outer surface of cross-linked polyethylene insulation layer to obtain the first shielding layer. Take copper wire and cross-weave it on the outer surface of the first shielding layer to obtain the second shielding layer. S4. A composite phase change material is used to fill the outside of the second shielding layer to form a filling layer; S5. Extruding polyolefin material onto the outside of the filler layer to form an inner protective layer; S6. Wrap a steel strip armor layer around the outer side of the inner protective layer; S7. A new type of high heat dissipation energy storage equipment cable is prepared by extruding polyolefin material on the outside of the steel strip armor layer to form an outer sheath.

[0021] Example 1: A method for preparing modified spherical alumina includes the following steps: C1. Add 6.5g triallyl isocyanurate and 10mL dichloromethane to the reactor, stir and mix, then add a mixed solution of 3g 3-mercaptopropyltriethoxysilane, 0.3g triethylamine and 6mL dichloromethane, stir and react for 18h to prepare the modified silane coupling agent. C2. Take 6.5g of spherical alumina with particle sizes of 2µm, 5µm, 30µm and 70µm, mix them in a mass ratio of 1:1:1.3:1.7 and then ultrasonically disperse them in a mixed solution of 80mL ethanol and 20mL deionized water. Adjust the pH of the system to 4 using glacial acetic acid, then add 15mL of modified silane coupling agent, and stir the mixture at 65℃ for 8h. After the reaction is completed, centrifuge, wash and dry to prepare modified spherical alumina.

[0022] Example 2 A composite phase change material comprises the following components in parts by weight: 25.2 parts of binary eutectic material, 20.1 parts of crosslinked polyurethane, 0.5 parts of graphene powder, and 3.8 parts of modified spherical alumina prepared in Example 1.

[0023] The preparation method of the above-mentioned composite phase change material includes the following steps: A. Lauric acid and palmitic acid are added to the reactor at a mass ratio of 3.44:1. After sealing, the mixture is placed in an 80°C constant temperature water bath to melt and stir until it is evenly mixed. After cooling to room temperature, a binary eutectic material is prepared. B. Add 22g of pre-dried PEG6000 to the reactor and melt it under heating at 80℃. Then add 1.7g of diphenylmethane diisocyanate and 0.002g of dibutyltin dilaurate. React at 80℃ for 4h. Then add 0.09g of boric acid and continue the reaction for 2h to prepare crosslinked polyurethane. C. Weigh each component according to the weight parts, add the binary eutectic material to the reactor, place it in an oven to melt, set the temperature to 80℃, keep it in a completely melted state for 30 minutes, then add the mixture of graphene powder and modified spherical alumina, stir and disperse evenly, then slowly add it to the crosslinked polyurethane, continue stirring for 30 minutes, and then place it in an 80℃ oven to cure for 24 hours to prepare the composite phase change material.

[0024] Example 3 A composite phase change material comprises the following components in parts by weight: 27.7 parts of binary eutectic material, 22.4 parts of crosslinked polyurethane, 0.8 parts of graphene powder, and 5.6 parts of modified spherical alumina prepared in Example 1.

[0025] The preparation method of the above-mentioned composite phase change material includes the following steps: A. Lauric acid and palmitic acid are added to the reactor at a mass ratio of 3.44:1. After sealing, the mixture is placed in an 80°C constant temperature water bath to melt and stir until it is evenly mixed. After cooling to room temperature, a binary eutectic material is prepared. B. Add 22g of pre-dried PEG6000 to the reactor and melt it under heating at 80℃. Then add 1.7g of diphenylmethane diisocyanate and 0.002g of dibutyltin dilaurate. React at 80℃ for 4h. Then add 0.14g of boric acid and continue the reaction for 2h to prepare crosslinked polyurethane. C. Weigh each component according to the weight parts, add the binary eutectic material to the reactor, place it in an oven to melt, set the temperature to 80℃, keep it in a completely melted state for 30 minutes, then add the mixture of graphene powder and modified spherical alumina, stir and disperse evenly, then slowly add it to the crosslinked polyurethane, continue stirring for 30 minutes, and then place it in an 80℃ oven to cure for 24 hours to prepare the composite phase change material.

[0026] Example 4 A composite phase change material comprises the following components in parts by weight: 29.8 parts of binary eutectic material, 23.7 parts of crosslinked polyurethane, 1.1 parts of graphene powder, and 7.8 parts of modified spherical alumina prepared in Example 1.

[0027] The preparation method of the above-mentioned composite phase change material includes the following steps: A. Lauric acid and palmitic acid are added to the reactor at a mass ratio of 3.44:1. After sealing, the mixture is placed in an 80°C constant temperature water bath to melt and stir until it is evenly mixed. After cooling to room temperature, a binary eutectic material is prepared. B. Add 22g of pre-dried PEG6000 to the reactor and melt it under heating at 80℃. Then add 1.7g of diphenylmethane diisocyanate and 0.002g of dibutyltin dilaurate. React at 80℃ for 4h. Then add 0.18g of boric acid and continue the reaction for 2h to prepare crosslinked polyurethane. C. Weigh each component according to the weight parts, add the binary eutectic material to the reactor, place it in an oven to melt, set the temperature to 80℃, keep it in a completely melted state for 30 minutes, then add the mixture of graphene powder and modified spherical alumina, stir and disperse evenly, then slowly add it to the crosslinked polyurethane, continue stirring for 30 minutes, and then place it in an 80℃ oven to cure for 24 hours to prepare the composite phase change material.

[0028] Comparative Example 1: A composite phase change material comprises the following components in parts by weight: The mixture consists of 29.8 parts of binary eutectic material, 23.7 parts of cross-linked polyurethane, 1.1 parts of graphene powder, and 7.8 parts of spherical alumina (mixed with spherical alumina of particle sizes of 2µm, 5µm, 30µm, and 70µm in a mass ratio of 1:1:1.3:1.7).

[0029] The preparation method of the above-mentioned composite phase change material includes the following steps: A. Lauric acid and palmitic acid are added to the reactor at a mass ratio of 3.44:1. After sealing, the mixture is placed in an 80°C constant temperature water bath to melt and stir until it is evenly mixed. After cooling to room temperature, a binary eutectic material is prepared. B. Add 22g of pre-dried PEG6000 to the reactor and melt it under heating at 80℃. Then add 1.7g of diphenylmethane diisocyanate and 0.002g of dibutyltin dilaurate. React at 80℃ for 4h. Then add 0.18g of boric acid and continue the reaction for 2h to prepare crosslinked polyurethane. C. Weigh each component according to the weight parts, add the binary eutectic material to the reactor, place it in an oven to melt, set the temperature to 80℃, keep it in a completely melted state for 30 minutes, then add the mixture of graphene powder and spherical alumina, stir and disperse evenly, then slowly add it to the crosslinked polyurethane, continue stirring for 30 minutes, and then place it in an 80℃ oven to cure for 24 hours to prepare the composite phase change material.

[0030] Comparative Example 2: A composite phase change material comprises the following components in parts by weight: The composition consists of 29.8 parts of binary eutectic material, 23.7 parts of cross-linked polyurethane, and 1.1 parts of graphene powder.

[0031] The preparation method of the above-mentioned composite phase change material includes the following steps: A. Lauric acid and palmitic acid are added to the reactor at a mass ratio of 3.44:1. After sealing, the mixture is placed in an 80°C constant temperature water bath to melt and stir until it is evenly mixed. After cooling to room temperature, a binary eutectic material is prepared. B. Add 22g of pre-dried PEG6000 to the reactor and melt it under heating at 80℃. Then add 1.7g of diphenylmethane diisocyanate and 0.002g of dibutyltin dilaurate. React at 80℃ for 4h. Then add 0.18g of boric acid and continue the reaction for 2h to prepare crosslinked polyurethane. C. Weigh each component according to the weight parts, add the binary eutectic material to the reactor, place it in an oven to melt, set the temperature to 80℃, keep it in a completely melted state for 30 minutes, then add graphene powder, stir and disperse evenly, then slowly add it to the crosslinked polyurethane, continue stirring for 30 minutes, and then place it in an 80℃ oven to cure for 24 hours to prepare the composite phase change material.

[0032] Comparative Example 3: A composite phase change material comprises the following components in parts by weight: 29.8 parts of binary eutectic material, 1.1 parts of graphene powder, and 7.8 parts of modified spherical alumina prepared in Example 1.

[0033] The preparation method of the above-mentioned composite phase change material includes the following steps: A. Lauric acid and palmitic acid are added to the reactor at a mass ratio of 3.44:1. After sealing, the mixture is placed in an 80°C constant temperature water bath to melt and stir until it is evenly mixed. After cooling to room temperature, a binary eutectic material is prepared. B. Weigh each component according to the weight parts, add the binary eutectic material to the reactor, place it in an oven to melt, set the temperature to 80℃, keep it in a completely melted state for 30 minutes, then add the mixture of graphene powder and modified spherical alumina, stir and disperse evenly, and then place it in an 80℃ oven to cure for 24 hours to prepare the composite phase change material.

[0034] Performance testing The composite phase change materials prepared in Examples 2-4 and Comparative Examples 1-3 were subjected to performance testing: the latent heat of phase change was determined by differential scanning calorimetry at a scanning rate of 10℃ / min and a temperature scanning range of 20~80℃, and the thermal stability was analyzed after 200 cycles of testing; the samples were placed on a heating plate and heated at 80℃ for 30min to test the heat leakage performance, and the leakage rate α=M2 / M1×100%, where M1-mass of the sample before heating, g, and M2-mass loss of the sample after heating, g; according to ISO22007-2 standard, the thermal conductivity of the samples was determined by Hotdisk thermal conductivity meter at (20±1)℃, and each sample was measured 3 times and the average value was taken. The data results are shown in Table 1.

[0035]

[0036] As can be seen from the data results in Table 1, the materials prepared in Examples 2-4 of this invention have good thermal conductivity, high latent heat of phase change, and a wide phase change temperature range, while also possessing good thermal cycling stability and flame retardant properties. In Comparative Example 1, no modification treatment was performed on the spherical alumina, and in Comparative Example 2, no modified spherical alumina was added. The measured thermal conductivity and limiting oxygen index of Comparative Examples 1-2 were lower than those of Examples 2-4, indicating that the gradation of spherical alumina with different particle sizes improved the thermal conductivity of the material to a certain extent. Furthermore, grafting modified silane coupling agent onto the surface of the spherical alumina further enhances the thermal conductivity and flame retardant properties of the material, thereby achieving a higher thermal conductivity while maintaining a high latent heat. In Comparative Example 3, no cross-linked polyurethane was added, and the measured latent heat of melting, latent heat of crystallization, and limiting oxygen index after thermal cycling were lower than those of Examples 2-4, while the leakage rate was higher. This indicates that the introduction of cross-linked polyurethane is beneficial for improving the thermal cycling stability and flame retardant properties of the material.

[0037] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, 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.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A novel high-heat-dissipation energy storage device cable, characterized in that, The device comprises, from the inside out, a conductive core, a cross-linked polyethylene insulation layer, a shielding layer, a filling layer, an inner sheath, an armor layer, and an outer sheath. The filling layer is made of a composite phase change material, which comprises the following components by weight: 25-30 parts of binary eutectic material, 20-24 parts of cross-linked polyurethane, 0.5-1.2 parts of graphene powder, and 3.5-8 parts of modified spherical alumina. The crosslinked polyurethane is made from PEG6000, diphenylmethane diisocyanate and boric acid; the modified spherical alumina is made by grafting a modified silane coupling agent prepared by the thiol-ene click reaction of triallyl isocyanurate and 3-mercaptopropyltriethoxysilane onto the surface of the spherical alumina.

2. The novel high-heat-dissipation energy storage device cable according to claim 1, characterized in that, The preparation method of the composite phase change material includes the following steps: A. Add lauric acid and palmitic acid to the reactor, seal it, and place it in an 80°C constant temperature water bath to melt and stir until the mixture is uniform. Cool to room temperature to prepare a binary eutectic material. B. Add pre-dried PEG6000 to the reactor and melt it under heating at 80°C. Then add diphenylmethane diisocyanate and dibutyltin dilaurate and react at 80°C for 3-5 hours. Then add boric acid and continue the reaction for 2-3 hours to prepare cross-linked polyurethane. C. Weigh each component according to the weight parts, add the binary eutectic material to the reactor, place it in an oven to melt, set the temperature to 80℃, keep it in a completely melted state for 30 minutes, then add the mixture of graphene powder and modified spherical alumina, stir and disperse evenly, then slowly add it to the crosslinked polyurethane, continue stirring for 30 minutes, and then place it in an 80℃ oven to cure for 24 hours to prepare the composite phase change material.

3. The novel high-heat-dissipation energy storage device cable according to claim 2, characterized in that, In step A, the mass ratio of lauric acid to palmitic acid is 3.4~3.5:

1.

4. The novel high-heat-dissipation energy storage device cable according to claim 2, characterized in that, In step B, the mass ratio of PEG6000, diphenylmethane diisocyanate, and boric acid is 20~25:1.5~1.8:0.08~0.

2.

5. The novel high-heat-dissipation energy storage device cable according to claim 2, characterized in that, The preparation method of modified spherical alumina in step C includes the following steps: C1. Add triallyl isocyanurate and dichloromethane to the reactor, stir and mix, then add a mixed solution of 3-mercaptopropyltriethoxysilane, triethylamine and dichloromethane, stir and react for 18 h to prepare the modified silane coupling agent. C2. Spherical alumina was ultrasonically dispersed in a mixed solution of ethanol and deionized water. The pH of the system was adjusted to 4 using glacial acetic acid. Then, a modified silane coupling agent was added, and the mixture was stirred at 60-75°C for 7-9 hours. After the reaction was completed, the mixture was centrifuged, washed, and dried to obtain modified spherical alumina.

6. The novel high-heat-dissipation energy storage device cable according to claim 5, characterized in that, The spherical alumina is composed of spherical alumina with particle sizes of 2µm, 5µm, 30µm, and 70µm mixed in a mass ratio of 1:1:1.3:1.

7.

7. The novel high-heat-dissipation energy storage device cable according to claim 1, characterized in that, The shielding layer consists of an aluminum-plastic composite tape shielding layer and a copper wire braided shielding layer.

8. The novel high-heat-dissipation energy storage device cable according to claim 1, characterized in that, The inner and outer protective layers are made of polyolefin materials.

9. The novel high-heat-dissipation energy storage device cable according to claim 1, characterized in that, The armor layer is a steel strip armor layer.

10. A method for preparing a novel high-heat-dissipation energy storage device cable according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. A copper rod is drawn using a wire drawing machine to obtain copper wire, which is then annealed to obtain a conductor. Then, at least two of the conductors are twisted together to obtain a conductor core. S2. Extrude a cross-linked polyethylene insulation layer onto the outer surface of the conductor core using an extruder; S3. Take aluminum-plastic composite tape and wrap it around the outer surface of cross-linked polyethylene insulation layer to obtain the first shielding layer. Take copper wire and cross-weave it on the outer surface of the first shielding layer to obtain the second shielding layer. S4. A composite phase change material is used to fill the outside of the second shielding layer to form a filling layer; S5. Extruding polyolefin material onto the outside of the filler layer to form an inner protective layer; S6. Wrap a steel strip armor layer around the outer side of the inner protective layer; S7. A new type of high heat dissipation energy storage equipment cable is prepared by extruding polyolefin material on the outside of the steel strip armor layer to form an outer sheath.

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