CN113306176A - Microchannel thermoplastic composite material and preparation method thereof - Google Patents

Microchannel thermoplastic composite material and preparation method thereof Download PDF

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Publication number
CN113306176A
CN113306176A CN202110547749.8A CN202110547749A CN113306176A CN 113306176 A CN113306176 A CN 113306176A CN 202110547749 A CN202110547749 A CN 202110547749A CN 113306176 A CN113306176 A CN 113306176A
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prepreg
setting
microchannel
capillary tube
temperature
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陈勇
李东明
黄琼
陈哲明
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Chongqing University of Technology
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Chongqing University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/70—Completely encapsulating inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/18—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length in the form of a mat, e.g. sheet moulding compound [SMC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
    • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
    • B29C70/22—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure
    • B29C70/228—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least two directions forming a two dimensional structure the structure being stacked in parallel layers with fibres of adjacent layers crossing at substantial angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts spaced apart pieces on the surface of a layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)

Abstract

本发明涉及电动汽车电池领域，尤指一种微通道热塑性复合材料及其制备方法，将一定数量一定厚度的预浸料与毛细管在一定条件下，通过热压机的融化与压缩工况下，使这些毛细管在复合材料中间形成微通道，适用于电动汽车的电池热包管理系统，具有轻质、高强度的特点。

Figure 202110547749

The invention relates to the field of electric vehicle batteries, in particular to a microchannel thermoplastic composite material and a preparation method thereof. Making these capillaries form microchannels in the middle of the composite material is suitable for the battery heat pack management system of electric vehicles, and has the characteristics of light weight and high strength.

Figure 202110547749

Description

Microchannel thermoplastic composite material and preparation method thereof
Technical Field
The invention relates to the field of batteries of electric vehicles, in particular to a microchannel thermoplastic composite material and a preparation method thereof.
Background
In order to actively cope with the problems of energy shortage and environmental pollution, electric vehicles powered by batteries are regarded as the future development direction of the world vehicle industry, and have already gained important commercial application. At present, the development of new energy automobiles in China enters the key period of transformation and upgrading, and independent innovation of key parts and core technologies of electric automobiles is urgently needed to be broken through in 2020-. Lightweight and high-efficient battery management technique just belongs to the critical problem that electric automobile field urgently needed to break through.
Under the low temperature state, the electrochemical reaction speed in the battery is reduced, the internal resistance is increased, and the capacity is reduced. Under the high temperature state, the ageing speed of battery is accelerated, and life shortens, if the temperature that makes the battery package continues to rise because of not in time dispelling the heat, the battery can take place thermal runaway and even spalling explosion, directly threatens the life safety of driving the passenger in the car.
Along with the great improvement of the energy density, the endurance and the charge-discharge speed of the battery of the electric automobile, the safety requirements can not be met by air cooling, and a liquid cooling heat management system is basically needed. The aluminum alloy micro-pipeline pool liquid cooling plate and the battery Pack shell are integrated into a whole to form an effective measure for the heat management and light weight design of the current battery Pack, such as a typical liquid cooling system of a Chevrolet Volt battery Pack. In order to meet the requirement of lightweight design, the composite material is adopted to replace the existing metal material to design the heat management structure of the battery pack, and the heat management structure becomes a research hotspot of researchers and automobile manufacturers at home and abroad.
Disclosure of Invention
In order to solve the problems, the invention provides a microchannel thermoplastic composite material and a preparation method thereof, which are suitable for a battery hot pack management system of an electric automobile and have the characteristics of light weight and high strength.
In order to achieve the purpose, the invention adopts the technical scheme that: a microchannel thermoplastic composite material comprises a capillary tube and a prepreg, wherein the prepreg is provided with a plurality of layers, and the capillary tube is embedded in the prepreg.
Further, the capillary tube is one or more of a capillary steel tube, a copper tube or other alloy tubes.
Further, the cross section of the capillary tube is one of a circle, a square and a diamond, wherein the cross section of the round capillary tube is one of the outer diameter of more than 0.5mm and the wall thickness of more than 0.1 mm; the cross section of the square capillary tube is one of the cross section sizes of 0.3mmX0.3mm and above; the cross section of the diamond capillary tube is one of the side lengths of more than 0.3 mm.
Preferably, the cross-sectional dimension of the circular capillary tube is 0.5mm of outer diameter, 0.1mm of wall thickness, 0.7mm of outer diameter, 0.15mm of wall thickness, 0.9mm of outer diameter, and 0.2mm of wall thickness; the cross-sectional dimension of the square capillary tube is 0.3mmX0.3mm, 0.4X0.4mm, 0.5X0.5mm, 0.6 X0.6mm; the cross-sectional dimensions of the diamond capillary tube are 0.3mm, 0.4mm, 0.5mm and 0.6mm in side length.
Further, the ply direction of the prepreg is 0 °, 45 °, -45 °, 90 °.
The prepreg laying direction and the laying quantity are determined according to the size of the capillary; the direction angle of the ply and the reasonable ply angle are determined, the mechanical property and other properties of local parts can be optimized, and the standard ply angle is 0 degree, 45 degrees, -45 degrees and 90 degrees.
Apart from the longitudinal and transverse shear strength test samples, the arbitrary ply angle ply is adopted only when special requirements exist, the variety of the ply angles used is as small as possible, the stacking sequence of all the ply angles is determined, in order to reduce the deformation in the curing process, the overall ply sequence should be bilaterally symmetrical on the ply center line of the ply structure, the center line is generally positioned in the middle area of the laminated board, and in order to ensure the uniform ply sequence, different ply angles should be uniformly distributed in the ply sequence, for example: 0 °, +45 °, -45 °, 90 °, 90 °, -45 °, +45 °, 0 °;
②0°，90°，+45°，-45°，-45°，+45°，90°，0°；
③0°，90°，90°，0°；
④0°，+45°，90°，90°，+45°，0°；
0 degree, -45 degree, 90 degree, -45 degree, 0 degree and so on.
A method of making a microchannel thermoplastic composite by melting a prepreg above and below a capillary tube by a hot press and then cooling the prepreg to form microchannels in the prepreg, comprising the steps of:
(1) wetting the non-woven fabric with alcohol to wipe the surfaces of a capillary tube, a grinding tool and a prepreg, and wiping the surface and the periphery of a processing surface of the mould with a release agent;
(2) placing a plurality of layers of prepreg on a mould, placing the capillaries with the same spacing on the surface of the prepreg, finally placing a plurality of layers of prepreg, covering the mould, and sending the prepreg to a workbench of a hot press;
(3) primary temperature rise: setting the temperature change time of the hot press to 1800s, setting the temperature to 160 ℃ and the pressure to 1 t;
(4) secondary heating: setting the temperature change time of a hot press to 600s, setting the temperature to 200 ℃ and the pressure to 1 t;
(5) and (3) heat preservation: setting the temperature change time of the hot press to 240s, setting the temperature to 200 ℃ and the pressure to 2 t;
(6) cooling: setting the temperature change time of the hot press to be 32767s, setting the temperature to be 50 ℃ and the pressure to be 1 t.
It should be noted that during the warming and holding phases, one must observe the temperature at the side of the experimental machine in order to avoid accidents.
The invention has the beneficial effects that: the practical thermoplastic method in the composite material prepares the capillary as the microchannel, can meet the battery hot pack management requirement of the electric vehicle, simultaneously retains the advantages of high strength, light weight and the like of the thermoplastic composite material, and has very high practicability.
Drawings
Fig. 1 is a partial cross-sectional view of a non-autoclaved material of the present invention.
Fig. 2 is a partial cross-sectional view of the hot-pressed material of the present invention.
The reference numbers illustrate: 1-prepreg; 2-capillary tube.
Detailed Description
Referring to fig. 1-2, the present invention relates to a microchannel thermoplastic composite material, which comprises a capillary tube and a prepreg 1, wherein the prepreg 1 has a plurality of layers, and the capillary tube 2 is embedded in the prepreg 1.
Further, the capillary tube 2 is one or more of a capillary steel tube, a copper tube or other alloy tubes.
Further, the section of the capillary tube 2 is one of a circle, a square and a diamond, wherein the section size of the round capillary tube is one of the outer diameter of more than 0.5mm and the wall thickness of more than 0.1 mm; the cross section of the square capillary tube is one of the cross section sizes of 0.3mmX0.3mm and above; the cross section of the diamond capillary tube is one of the side lengths of more than 0.3 mm.
Preferably, the cross-sectional dimension of the circular capillary tube is 0.5mm of outer diameter, 0.1mm of wall thickness, 0.7mm of outer diameter, 0.15mm of wall thickness, 0.9mm of outer diameter, and 0.2mm of wall thickness; the cross-sectional dimension of the square capillary tube is 0.3mmX0.3mm, 0.4X0.4mm, 0.5X0.5mm, 0.6 X0.6mm; the cross-sectional dimensions of the diamond capillary tube are 0.3mm, 0.4mm, 0.5mm and 0.6mm in side length.
Further, the ply direction of the prepreg 1 is 0 °, 45 °, -45 °, 90 °.
The laying direction and the laying quantity of the prepreg 1 are determined according to the size of the capillary 2; the direction angle of the ply and the reasonable ply angle are determined, the mechanical property and other properties of local parts can be optimized, and the standard ply angle is 0 degree, 45 degrees, -45 degrees and 90 degrees.
Apart from the longitudinal and transverse shear strength test samples, the arbitrary ply angle ply is adopted only when special requirements exist, the variety of the ply angles used is as small as possible, the stacking sequence of all the ply angles is determined, in order to reduce the deformation in the curing process, the overall ply sequence should be bilaterally symmetrical on the ply center line of the ply structure, the center line is generally positioned in the middle area of the laminated board, and in order to ensure the uniform ply sequence, different ply angles should be uniformly distributed in the ply sequence, for example: 0 °, +45 °, -45 °, 90 °, 90 °, -45 °, +45 °, 0 °;
②0°，90°，+45°，-45°，-45°，+45°，90°，0°；
③0°，90°，90°，0°；
④0°，+45°，90°，90°，+45°，0°；
0 degree, -45 degree, 90 degree, -45 degree, 0 degree and so on.
A method of making a microchannel thermoplastic composite by melting a prepreg above and below a capillary by a hot press and then cooling the prepreg to form microchannels in the prepreg 1 by the capillary 2, comprising the steps of:
(1) wetting the non-woven fabric with alcohol to wipe the surfaces of a capillary tube, a grinding tool and a prepreg, and wiping the surface and the periphery of a processing surface of the mould with a release agent;
(2) placing a plurality of layers of prepreg on a mould, placing the capillary tubes 2 with the same spacing (5mm, 10mm, 15mm and the like) on the surface of the prepreg, finally placing a plurality of layers of prepreg 1, covering the mould, and sending the prepreg to a workbench of a hot press;
(3) primary temperature rise: setting the temperature change time of the hot press to 1800s, setting the temperature to 160 ℃ and the pressure to 1 t;
(4) secondary heating: setting the temperature change time of a hot press to 600s, setting the temperature to 200 ℃ and the pressure to 1 t;
(5) and (3) heat preservation: setting the temperature change time of the hot press to 240s, setting the temperature to 200 ℃ and the pressure to 2 t;
(6) cooling: setting the temperature change time of the hot press to be 32767s, setting the temperature to be 50 ℃ and the pressure to be 1 t.
It should be noted that during the warming and holding phases, one must observe the temperature at the side of the experimental machine in order to avoid accidents.
The invention has the beneficial effects that: the practical thermoplastic method in the composite material prepares the capillary as the microchannel, can meet the battery hot pack management requirement of the electric vehicle, simultaneously retains the advantages of high strength, light weight and the like of the thermoplastic composite material, and has very high practicability.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.

Claims (5)

1. A microchannel thermoplastic composite, characterized in that: contain capillary and prepreg, prepreg is equipped with a plurality of layers, the capillary inlays to be established in the prepreg.
2. The method of making a microchannel thermoplastic composite as set forth in claim 1, wherein: the capillary tube is one or more of a capillary steel tube, a copper tube or other alloy tubes.
3. The method of making a microchannel thermoplastic composite as set forth in claim 2, wherein: the cross section of the capillary tube is one of a circle, a square and a rhombus, wherein the cross section of the round capillary tube is more than 0.5mm in outer diameter and more than 0.1mm in wall thickness; the cross section of the square capillary tube is one of the cross section sizes of 0.3mmX0.3mm and above; the cross section of the diamond capillary tube is one of the side lengths of more than 0.3 mm.
4. The method of making a microchannel thermoplastic composite as set forth in claim 1, wherein: the laying direction of the prepreg is 0 degree, 45 degrees, -45 degrees and 90 degrees.
5. A preparation method of a microchannel thermoplastic composite material is characterized by comprising the following steps: melting the prepreg above and below the capillaries by a hot press, and then cooling the capillaries to form microchannels in the prepreg, comprising the steps of:
(1) wetting the non-woven fabric with alcohol to wipe the surfaces of a capillary tube, a grinding tool and a prepreg, and wiping the surface and the periphery of a processing surface of the mould with a release agent;
(2) placing a plurality of layers of prepreg on a mould, placing the capillaries with the same spacing on the surface of the prepreg, finally placing a plurality of layers of prepreg, covering the mould, and sending the prepreg to a workbench of a hot press;
(3) primary temperature rise: setting the temperature change time of the hot press to 1800s, setting the temperature to 160 ℃ and the pressure to 1 t;
(4) secondary heating: setting the temperature change time of a hot press to 600s, setting the temperature to 200 ℃ and the pressure to 1 t;
(5) and (3) heat preservation: setting the temperature change time of the hot press to 240s, setting the temperature to 200 ℃ and the pressure to 2 t;
(6) cooling: setting the temperature change time of the hot press to be 32767s, setting the temperature to be 50 ℃ and the pressure to be 1 t.
CN202110547749.8A 2021-05-19 2021-05-19 Microchannel thermoplastic composite material and preparation method thereof Pending CN113306176A (en)

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