CN113380447B - Cable for energy storage system - Google Patents

Cable for energy storage system Download PDF

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CN113380447B
CN113380447B CN202110775608.1A CN202110775608A CN113380447B CN 113380447 B CN113380447 B CN 113380447B CN 202110775608 A CN202110775608 A CN 202110775608A CN 113380447 B CN113380447 B CN 113380447B
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antioxidant
cable
energy storage
storage system
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CN113380447A (en
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汪关才
李成成
刘亚农
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Suzhou Meiyu Polymer Materials Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C08L23/0853—Vinylacetate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/303—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302
    • H01B3/306—Polyimides or polyesterimides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/2224—Magnesium hydroxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/322—Ammonium phosphate
    • C08K2003/323—Ammonium polyphosphate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/22—Halogen free composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)

Abstract

The invention discloses a cable for an energy storage system, which comprises a central conductor, an XLPO (XLPO) insulating layer and a sheath layer; the XLPO insulating layer is coated on the outer side of the central conductor, and the sheath layer is tightly coated on the periphery of the XLPO insulating layer; the sheath layer is prepared from a halogen-free cross-linked flame-retardant sheath material and comprises the following components in parts by mass: 40-80 parts of first matrix resin, 20-30 parts of second matrix resin, 30-110 parts of flame retardant modifier, 3-6 parts of auxiliary crosslinking agent, 0.5-2 parts of anti-aging agent, 0.1-1 part of antioxidant and 0.1-1 part of lubricant; the first matrix resin is composed of a first EVA resin, a polyether polyurethane elastomer and a compatilizer, and the second matrix resin is composed of a second EVA resin and an SEBS elastomer; the VA content in the first EVA resin is 15% -25%, and the VA content in the second EVA resin is 45% -55%. The invention discloses a cable for an energy storage system, which has the advantages of high flexibility, good elasticity and good flame retardance, and has long service life at the working temperature of-40-125 ℃.

Description

Cable for energy storage system
Technical Field
The invention relates to the technical field of cables, in particular to a cable for an energy storage system.
Background
Because the energy sources needed by people are very temporal and spatial, in order to reasonably utilize the energy sources and improve the utilization rate of the energy, a device is needed to collect and store the redundant energy which is not used temporarily in a period of time into an Energy Storage System (ESS) in a certain mode, and then the redundant energy is extracted and used at the peak time or is transported to a place where the energy is in short supply for reuse. With the gradual maturity and scale of new energy such as photovoltaic energy, wind power energy, nuclear energy and the like, the development of energy storage is the key point for solving the high permeability of renewable clean energy. The links of power generation, power transmission, power distribution and power utilization of the power system can embody the value of energy storage.
The energy storage cable is an energy storage cable commonly used in an energy storage system, and generally refers to a connecting cable between batteries, between battery groups, between a battery pack and a junction box or a converter in the battery energy storage system. The cable is applied to direct current systems with rated voltages of DC600V, DC1000V and DC1500V, and the highest temperature resistant grade is 125 ℃. In view of the special use environment of the energy storage cable, strict requirements are provided for the cable in the aspects of thermal life, high and low temperature resistance, acid and alkali resistance, battery acid resistance, salt mist resistance, UV resistance, low smoke, zero halogen, combustion performance and the like. The temperature range of the using environment of the cable is-40 ℃ to +90 ℃, and the cable can be applied to three using scenes, namely indoor, outdoor movement and outdoor.
At present, cable insulation and sheath materials for an energy storage system mainly comprise: -40 ℃ to 90 ℃ grades of materials such as: PVC material, TPE material, cross-linked elastomer (EPDM or CPE) and cross-linked polyolefin material (XLPO); -40 ℃ to 125 ℃ grades of materials such as: cross-linked polyolefin material (XLPO), silicone rubber material.
The energy storage system cable is routed in a manner that places high demands on the flexibility of the overall cable, while a balance between flexibility, high elasticity and flame retardance is required. In addition, because the energy storage device is in operation for a long period of time, it will be a major challenge to the service life of the cable material. Therefore, it is necessary to develop a material for energy storage cables, which has high flexibility, good elasticity, good flame retardancy and long service life.
Disclosure of Invention
The invention aims to provide a cable for an energy storage system, which has the advantages of high flexibility, good elasticity and good flame retardance, and has long service life at the working temperature of-40-125 ℃.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a cable for an energy storage system, which comprises a central conductor, an XLPO (XLPO) insulating layer and a sheath layer, wherein the central conductor is arranged on the XLPO insulating layer; the central conductor is an annealed bare copper or tinned stranded conductor formed by crossed regular stranding; the XLPO insulating layer is coated on the outer side of the central conductor, and the sheath layer is tightly coated on the periphery of the XLPO insulating layer;
the sheath layer is prepared from a halogen-free cross-linked flame-retardant sheath material, and the halogen-free cross-linked flame-retardant sheath material comprises the following components in parts by mass: 40-80 parts of first matrix resin, 20-30 parts of second matrix resin, 30-110 parts of flame retardant modifier, 3-6 parts of auxiliary crosslinking agent, 0.5-2 parts of anti-aging agent, 0.1-1 part of antioxidant and 0.1-1 part of lubricant;
the first matrix resin is composed of a first EVA resin, a polyether polyurethane elastomer and a compatilizer, and the second matrix resin is composed of a second EVA resin and an SEBS elastomer; the VA content in the first EVA resin is 15% -25%, and the VA content in the second EVA resin is 45% -55%.
Further, the surface of the central conductor is coated with a polyetherimide protective layer, and the thickness of the polyetherimide protective layer is 10-50 mu m.
Further, in the first matrix resin, the mass ratio of the first EVA resin, the polyether polyurethane elastomer and the compatilizer is (2-6): 1: (0.2 to 0.5); in the second matrix resin, the mass ratio of the second EVA resin to the SEBS elastomer is 1: (0.5 to 1).
Further, the compatilizer is PE-g-MAH or ethylene-acrylate-maleic anhydride copolymer, the grafting ratio of the compatilizer is 0.5-1.5%, and the melt index of the compatilizer under the condition of 190 ℃ multiplied by 2.16kg is 0.5-2 g/10 min.
Further, the flame retardant modifier is composed of a hydroxide flame retardant, a polyphosphate flame retardant and ammonium octamolybdate, and the mass ratio of the hydroxide flame retardant to the polyphosphate flame retardant to the ammonium octamolybdate is (5-8): (2.5-5): 1.
further, the flame retardant modifier is prepared by compounding magnesium hydroxide, pentaerythritol ammonium polyphosphate and ammonium octamolybdate according to the mass ratio of 5:3: 1.
Further, the antioxidant is selected from one or more of antioxidant 1010, antioxidant 2246, antioxidant 1035, antioxidant 1024 and antioxidant 264, and the anti-aging agent is anti-aging agent 4010NA or anti-aging agent RD.
Further, the lubricant is selected from one or more of calcium stearate, zinc stearate, polyethylene wax and pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ]. The auxiliary crosslinking agent is selected from one or more of triallyl isocyanurate (TAIC), triallyl cyanurate (TAC) and trimethylolpropane trimethacrylate (TMPTMA).
Further, the halogen-free cross-linked flame-retardant sheath material also comprises 2-5 parts of inorganic filler, wherein the inorganic filler is composed of montmorillonite and pottery clay, and the ratio of montmorillonite to pottery clay is 1: 1 to 2. The flame retardant property of the sheath material can be improved by adding the montmorillonite, and the flame retardant property and the electrical insulating property of the sheath material can be improved by adding the argil.
Furthermore, the montmorillonite is nano montmorillonite treated by silane or titanate, and the granularity of the argil is 0.5-10 mu m.
The preparation method of the halogen-free cross-linked flame-retardant sheath material comprises the following steps:
(1) uniformly mixing the first EVA resin and the polyether polyurethane elastomer at the rotation speed of 200-500rpm to obtain a first matrix resin; uniformly mixing the second EVA resin and the SEBS elastomer at the rotation speed of 200-500rpm to obtain a second matrix resin;
(2) uniformly mixing the flame-retardant modifier and the inorganic filler at the rotation speed of 200-500rpm, then sequentially adding the compatilizer, the auxiliary crosslinking agent, the antioxidant, the lubricant and the anti-aging agent, stirring for 5-10min again, extruding, granulating and cooling at the temperature of 150-250 ℃ to obtain the halogen-free crosslinked flame-retardant sheath material.
And after the cable material is subsequently prepared into a cable, crosslinking is carried out by adopting an irradiation mode.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the cable for the energy storage system, the polyimide coating with the thickness of 10-50 mu m is coated on the surface of the central conductor, the polyetherimide has excellent insulativity and flame retardance, and is mainly used as a high-temperature-resistant protective material besides an insulating protective material of the conductor, so that the central conductor is well protected.
2. According to the cable for the energy storage system, the first EVA resin with low VA content and the second EVA resin with high VA content are compounded to serve as matrix resin, wherein the second EVA resin with high VA content has good cold resistance, oil resistance, flexibility and impact resistance, and simultaneously has good polarity, so that the compatibility with filler and flame retardant property are improved; and the first EVA resin with low VA content has good fluidity, so that the processing performance of the cable material is improved. In addition, the service temperature and the mechanical strength of the EVA resin material are further improved through irradiation crosslinking.
EVA resin has the defects of hardening and poor puncture resistance when used at low temperature, and the EVA is modified by introducing SEBS elastomer. The SEBS elastomer has good flexibility, heat resistance, compatibility and blending property, and can improve the flexibility and the breaking elongation property of EVA after being blended with the EVA; through crosslinking, the tensile strength and the tear strength of an EVA/SEBS elastomer blending system can be effectively improved.
4. The polyether polyurethane elastomer is introduced into the formula of the cable material, has good low-temperature flexibility, and can improve the low-temperature toughness of EVA; the polyether polyurethane elastomer has low viscosity, and can improve the processing performance of the resin material; in addition, the polyether polyurethane elastomer has good hydrolysis resistance, can be used for a long time, and is beneficial to prolonging the service life of the cable.
5. The cable for the energy storage system has good low-temperature flexibility, the winding is not cracked after being processed at the temperature of minus 40 ℃ for 240 hours, and the tensile strength retention and the elongation at break retention are both more than 94% after being processed at the temperature of 158 ℃ for 240 hours.
Drawings
Fig. 1 is a schematic cross-sectional view of a cable for an energy storage system according to the present invention;
wherein: 1. a center conductor; 2. a polyetherimide protective layer; 3. an XLPO insulating layer; 4. a sheath layer.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The experimental methods used in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used therein are commercially available without otherwise specified.
Example 1
The embodiment provides a cable for an energy storage system, which comprises a central conductor 1, an XLPO insulating layer 3 and a sheath layer 4; the central conductor 1 is an annealed bare copper stranded conductor formed by crossing and regularly stranding, and a polyetherimide protective layer 2 with the thickness of 10-50 mu m is coated on the surface of the central conductor 1; the XLPO insulating layer 3 is coated on the outer side of the central conductor 1, and the sheath layer 4 is tightly coated on the periphery of the XLPO insulating layer.
The sheath layer is prepared from a halogen-free cross-linked flame-retardant sheath material, and the halogen-free cross-linked flame-retardant sheath material comprises the following components in parts by mass: 45 parts of first EVA resin, 10 parts of polyether polyurethane elastomer, 5 parts of PE-g-MAH, 15 parts of second EVA resin, 15 parts of SEBS elastomer, 36 parts of flame retardant modifier, 3 parts of TAIC, 1 part of anti-aging agent 4010NA, 10100.2 parts of antioxidant, 0.2 part of calcium stearate and 1 part of nano montmorillonite. Wherein the VA content in the first EVA resin is 20%, and the VA content in the second EVA resin is 50%. The flame retardant modifier is obtained by compounding magnesium hydroxide, pentaerythritol ammonium polyphosphate and ammonium octamolybdate according to the mass ratio of 5:3: 1.
The preparation method of the halogen-free cross-linked flame-retardant sheath material comprises the following steps:
(1) adding the first EVA resin and the polyether polyurethane elastomer into a high-speed mixer, setting the rotation speed at 500rpm, and stirring until the first EVA resin and the polyether polyurethane elastomer are uniformly mixed to obtain first matrix resin; and adding the second EVA resin and the SEBS elastomer into a high-speed mixer, setting the rotating speed to be 500rpm, and stirring until the second EVA resin and the SEBS elastomer are uniformly mixed to obtain a second matrix resin.
(2) Adding the flame-retardant modifier and the inorganic filler into a high-speed mixer, setting the rotating speed at 500rpm, and stirring until the flame-retardant modifier and the inorganic filler are uniformly mixed; then adding the compatilizer, the main cross-linking agent, the antioxidant, the lubricant and the anti-aging agent in sequence, stirring for 5-10min again, extruding, granulating and cooling at 180-200 ℃ to obtain the halogen-free cross-linking flame-retardant sheath material.
Examples 2 to 5, comparative examples 1 to 3
The formulations of the halogen-free cross-linked flame retardant sheathing compounds of examples 2 to 5 and comparative examples 1 to 3 are shown in Table 1.
TABLE 1 formulation of halogen-free crosslinked flame-retardant sheathing compound of examples and comparative examples
Figure BDA0003154686290000051
Figure BDA0003154686290000061
It should be noted that, the VA content in the first EVA resin is 20%, the VA content in the second EVA resin is 50%, the grafting ratio of the compatibilizer is 1.0%, and the melt index thereof under the condition of 190 ℃ x 2.16kg is 0.5-0.6 g/10 min. The nano montmorillonite is nano montmorillonite treated by titanate, and the particle size of the pottery clay is 0.5-10 mu m.
According to the same method as the examples, the components in the formula are prepared into the halogen-free cross-linking flame-retardant sheath material.
Performance detection
The halogen-free crosslinked flame-retardant sheathing materials of examples and comparative examples were subjected to performance tests with reference to standard CQC 1143& PPP 58049A "Battery connection Cable for Power energy storage System", and the results are shown in Table 2.
TABLE 2 Performance test results of the halogen-free crosslinked flame-retardant sheathing materials of examples and comparative examples
Figure BDA0003154686290000062
Figure BDA0003154686290000071
From the results of the above table, it can be seen that compared with the comparative example, the halogen-free crosslinked flame retardant sheathing compound of the present invention is superior to the comparative example in various indexes, and particularly, after the treatment of 158 ℃ for 240 hours, the tensile strength retention rate and the elongation at break retention rate are significantly superior to the comparative example.
In conclusion, the cable for the energy storage system has the advantages of high flexibility, good elasticity and good flame retardance, can be used for a long time at the working temperature of-40-125 ℃, and has long service life.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims (6)

1. A cable for an energy storage system is characterized by comprising a central conductor, an XLPO insulating layer and a sheath layer; the central conductor is an annealed bare copper or tinned stranded conductor formed by crossed regular stranding; the XLPO insulating layer is coated on the outer side of the central conductor, and the sheath layer is tightly coated on the periphery of the XLPO insulating layer;
the sheath layer is prepared from a halogen-free cross-linked flame-retardant sheath material, and the halogen-free cross-linked flame-retardant sheath material comprises the following components in parts by mass: 40-80 parts of first matrix resin, 20-30 parts of second matrix resin, 30-110 parts of flame retardant modifier, 3-6 parts of auxiliary crosslinking agent, 0.5-2 parts of anti-aging agent, 0.1-1 part of antioxidant, 0.1-1 part of lubricant and 2-5 parts of inorganic filler;
the first matrix resin is composed of a first EVA resin, a polyether polyurethane elastomer and a compatilizer, and the second matrix resin is composed of a second EVA resin and an SEBS elastomer; the content of VA in the first EVA resin is 15% -25%, and the content of VA in the second EVA resin is 45% -55%;
in the first matrix resin, the mass ratio of the first EVA resin, the polyether polyurethane elastomer and the compatilizer is (2-6): 1: (0.2 to 0.5); in the second matrix resin, the mass ratio of the second EVA resin to the SEBS elastomer is 1: (0.5 to 1);
the compatilizer is PE-g-MAH or ethylene-acrylate-maleic anhydride copolymer, the grafting ratio of the compatilizer is 0.5-1.5%, and the melt index of the compatilizer under the condition of 190 ℃ multiplied by 2.16kg is 0.5-2 g/10 min;
the flame retardant modifier is composed of a hydroxide flame retardant, a polyphosphate flame retardant and ammonium octamolybdate, and the mass ratio of the hydroxide flame retardant to the polyphosphate flame retardant to the ammonium octamolybdate is (5-8): (2.5-5): 1;
the inorganic filler is montmorillonite or argil; or the inorganic filler consists of montmorillonite and argil, and the mass ratio of montmorillonite to argil is 1: 1 to 2.
2. The cable for the energy storage system according to claim 1, wherein the surface of the central conductor is coated with a polyetherimide protective layer, and the thickness of the polyetherimide protective layer is 10-50 μm.
3. The cable for the energy storage system as recited in claim 1, wherein the flame retardant modifier is obtained by compounding magnesium hydroxide, pentaerythritol ammonium polyphosphate and ammonium octamolybdate according to a mass ratio of 5:3: 1.
4. The cable for the energy storage system as claimed in claim 1, wherein the antioxidant is one or more selected from the group consisting of antioxidant 1010, antioxidant 2246, antioxidant 1035, antioxidant 1024 and antioxidant 264, and the antioxidant is antioxidant 4010NA or antioxidant RD.
5. The cable according to claim 1, wherein the lubricant is one or more selected from the group consisting of calcium stearate, zinc stearate, polyethylene wax, pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], and the co-crosslinking agent is one or more selected from the group consisting of triallyl isocyanurate, triallyl cyanurate, and trimethylolpropane trimethacrylate.
6. The cable for the energy storage system as claimed in claim 1, wherein the montmorillonite is nano montmorillonite treated with silane or titanate, and the particle size of the pottery clay is 0.5-10 μm.
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