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CN-121989401-A - Preparation process of flame-retardant plastic-absorbing bracket for energy storage of new energy automobile

CN121989401ACN 121989401 ACN121989401 ACN 121989401ACN-121989401-A

Abstract

The invention discloses a preparation process of a flame-retardant plastic uptake support for energy storage of a new energy automobile, and relates to the technical field of plastic uptake supports. The preparation process of the flame-retardant plastic uptake bracket for the energy storage of the new energy automobile not only solves the core problems that flame retardance and mechanical property are contradictory, static protection cannot cope with thermal runaway, environmental protection compliance is absent and the like in the prior art, but also improves the production efficiency through integrated design. The measured data show that the bracket prepared by the process is superior to the prior art in key indexes such as UL94 test, impact strength, thermal shock integrity and the like, provides a safer, more reliable and more environment-friendly solution for the energy storage system of the new energy automobile, and has remarkable market application value and popularization prospect.

Inventors

  • ZHU WENXING

Assignees

  • 苏州睿鑫成新能源科技有限公司

Dates

Publication Date
20260508
Application Date
20260326

Claims (9)

  1. 1. The preparation process of the flame-retardant plastic uptake bracket for the energy storage of the new energy automobile is characterized by comprising the following steps of: S1, raw material pretreatment, namely melt blending bio-based polypropylene (BPP), a nano flame retardant and a toughening agent in a double screw extruder, wherein the nano flame retardant is modified expanded graphite (particle size 50-200 nanometers, addition amount is 5-15 wt%), and the toughening agent is bio-based elastomer (PLA-PBAT copolymer, addition amount is 3-8 wt%); S2, gradient distribution molding, namely heating the flame retardant master batch obtained in the step S1 and basic polypropylene to 180-220 ℃ in a plastic sucking molding device, and adopting pulse pressure control (the pressure periodical change range is 0.5-2.0 MPa and the period is 5-15 seconds) in the vacuum plastic sucking process to ensure that the concentration gradient distribution of the flame retardant from the surface layer to the inner layer is formed in the bracket; S3, integrating a micro-channel structure, namely presetting the micro-channel structure (with the diameter of 0.1-0.5mm and uniformly distributed along the thickness direction) in a plastic suction mould, and injecting extra flame retardant microcapsules (containing halogen-free flame retardant) into the bracket through the micro-channel during the molding in the step S2; S4, self-repairing surface treatment, namely immersing the molded bracket into a water-based coating solution containing nano silicon dioxide (particle size is 10-50 nanometers), wherein the thickness of the coating is 10-50 micrometers, and forming a compact flame-retardant protective layer.
  2. 2. The preparation process of the flame-retardant plastic suction bracket for the energy storage of the new energy automobile is characterized in that the pulse type pressure control is realized through an intelligent control system of plastic suction equipment, the pressure change frequency is dynamically matched with the thickness of the bracket, the pressure period is 10-15 seconds when the thickness of the bracket is more than or equal to 2mm, and the pressure period is 5-8 seconds when the thickness is less than 2 mm.
  3. 3. The process for preparing the flame-retardant plastic uptake bracket for energy storage of the new energy automobile according to claim 1, wherein the distribution density of the micro-channel structure is 5-10 per square centimeter, the open ends of the micro-channels are positioned on the outer surface of the bracket, the closed ends of the micro-channels are positioned on the inner layer, and the included angle between the open ends and the outer surface of the bracket is 30-60 degrees.
  4. 4. The preparation process of the flame-retardant plastic uptake bracket for the energy storage of the new energy automobile, which is characterized in that the core material of the flame retardant microcapsule is melamine polyphosphate (the addition amount is 1-3wt%) and the shell material is a heat-responsive polymer poly (N-isopropyl acrylamide), and when the temperature is more than or equal to 150 ℃, the microcapsule automatically releases the flame retardant.
  5. 5. The process for preparing the flame-retardant plastic uptake bracket for the energy storage of the new energy automobile according to claim 1, wherein after the surface treatment in the step (d), the bracket verifies the uniformity of the flame-retardant layer through online infrared spectrum detection, the detection wavelength range is 4000-400 cm, and the absorption peak intensity deviation of the flame-retardant layer is less than or equal to 5%.
  6. 6. The process for preparing the flame-retardant plastic uptake bracket for energy storage of the new energy automobile according to claim 1, wherein the weight ratio of the bio-based polypropylene (BPP) to the PLA-PBAT copolymer is 70:30 to 85:15, and the bio-based content in the BPP is more than or equal to 60wt%.
  7. 7. The process for preparing the flame-retardant plastic suction bracket for the energy storage of the new energy automobile according to claim 1, wherein the micro-channel structure is spirally distributed in the thickness direction of the bracket, and the helix angle is 15-30 degrees, so that the flame retardant microcapsules form an annular diffusion path in the bracket.
  8. 8. The preparation process of the flame-retardant plastic uptake bracket for the energy storage of the new energy automobile, which is disclosed in claim 1, is characterized in that the flame-retardant layer keeps integrity for more than or equal to 30 minutes in a 200 ℃ thermal shock test of the bracket after the self-repairing surface treatment, and the surface of the bracket is free from cracking and falling.
  9. 9. The process for preparing the flame-retardant plastic uptake bracket for energy storage of the new energy automobile according to claim 1, wherein the plastic uptake molding equipment synchronously integrates the buckling structure of the bracket and the battery module in the step S2, the height of the buckling bulge is 0.5-1.2mm, and the matching tolerance of the buckling bulge and the groove of the battery module is +/-0.1 mm.

Description

Preparation process of flame-retardant plastic-absorbing bracket for energy storage of new energy automobile Technical Field The invention relates to the technical field of plastic uptake supports, in particular to a preparation process of a flame-retardant plastic uptake support for energy storage of a new energy automobile. Background Along with the rapid development of new energy automobiles, the power battery system has higher requirements on the flame retardance, mechanical strength and environmental friendliness of the energy storage bracket. The traditional plastic suction bracket mostly adopts a brominated flame retardant (such as CN 110015421A) or a technology of uniformly adding the flame retardant (such as CN 112341234A), and has the core defects that the flame retardant-strength contradiction is that the uniform addition of the flame retardant (such as 15 wt%) leads to loose internal structure of the bracket, the impact strength is reduced from 15 kJ/m < 2 > to 10 kJ/m < 2 > (the requirement of GB/T26125-2011 standard is more than or equal to 12 kJ/m < 2 >), the impact resistance requirement of the battery pack cannot be met, the bracket is easy to break in collision, and the exposure risk of the battery pack is caused. Static flame-retardant failure that the existing bracket (such as CN 114572123B) only depends on a surface coating, when the local high temperature (more than or equal to 150 ℃) is caused by thermal runaway of the battery, the flame-retardant layer rapidly fails, and dynamic protection cannot be formed. The actual measurement shows that the integrity of the flame retardant layer of the traditional bracket is only maintained for 15 minutes under 150 ℃ thermal shock, and the requirements of GB 38031-2020 on the thermal runaway safety of the battery can not be met. Therefore, we propose a preparation process of the flame-retardant plastic uptake bracket for the energy storage of the new energy automobile. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a preparation process of a flame-retardant plastic uptake bracket for energy storage of a new energy automobile, which solves the problems in the prior art. In order to achieve the above purpose, the invention is realized by the following technical scheme, and the preparation process of the flame-retardant plastic uptake bracket for the energy storage of the new energy automobile comprises the following steps: S1, raw material pretreatment, namely melt blending bio-based polypropylene (BPP), a nano flame retardant and a toughening agent in a double screw extruder, wherein the nano flame retardant is modified expanded graphite (particle size 50-200 nanometers, addition amount is 5-15 wt%), and the toughening agent is bio-based elastomer (PLA-PBAT copolymer, addition amount is 3-8 wt%); S2, gradient distribution molding, namely heating the flame retardant master batch obtained in the step S1 and basic polypropylene to 180-220 ℃ in a plastic sucking molding device, and adopting pulse pressure control (the pressure periodical change range is 0.5-2.0 MPa and the period is 5-15 seconds) in the vacuum plastic sucking process to ensure that the concentration gradient distribution of the flame retardant from the surface layer to the inner layer is formed in the bracket; S3, integrating a micro-channel structure, namely presetting the micro-channel structure (with the diameter of 0.1-0.5mm and uniformly distributed along the thickness direction) in a plastic suction mould, and injecting extra flame retardant microcapsules (containing halogen-free flame retardant) into the bracket through the micro-channel during the molding in the step S2; S4, self-repairing surface treatment, namely immersing the molded bracket into a water-based coating solution containing nano silicon dioxide (particle size is 10-50 nanometers), wherein the thickness of the coating is 10-50 micrometers, and forming a compact flame-retardant protective layer. Furthermore, the pulse pressure control is realized through an intelligent control system of the plastic sucking equipment, and the pressure change frequency is dynamically matched with the thickness of the bracket, wherein the pressure period is 10-15 seconds when the thickness of the bracket is more than or equal to 2mm, and is 5-8 seconds when the thickness is less than 2 mm. Further, the distribution density of the micro-channel structure is 5-10 per square centimeter, the open ends of the micro-channels are positioned on the outer surface of the bracket, the closed ends of the micro-channels are positioned on the inner layer, and the included angle between the open ends and the outer surface of the bracket is 30-60 degrees. Furthermore, the core material of the flame retardant microcapsule is melamine polyphosphate (the addition amount is 1-3wt%), the shell material is a thermally responsive polymer poly (N-isopropyl acrylamide), and when the temperature is more than or equal t