CN114193792A - Halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and preparation method thereof - Google Patents
Halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and preparation method thereof Download PDFInfo
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- CN114193792A CN114193792A CN202111512466.6A CN202111512466A CN114193792A CN 114193792 A CN114193792 A CN 114193792A CN 202111512466 A CN202111512466 A CN 202111512466A CN 114193792 A CN114193792 A CN 114193792A
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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
- B29C70/04—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
- B29C70/345—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 using matched moulds
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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
- B29C70/04—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
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- 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
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- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
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- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3468—Batteries, accumulators or fuel cells
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- 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
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
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- 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
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
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- 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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
- B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/726—Permeability to liquids, absorption
- B32B2307/7265—Non-permeable
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
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- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention provides a halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and a preparation method thereof. The product prepared by the invention has the advantages of light weight, high strength, smooth appearance, excellent waterproof and flame retardant properties. The invention has simple process, no need of pretreatment of materials, short production and forming period and high forming efficiency, and can realize mechanized, continuous and automatic production.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a continuous fiber reinforced thermoplastic battery cover plate and a preparation method thereof.
Background
With the rapid development of new energy electric vehicles in recent years, light weight has become an important standard for new energy vehicle material selection. Thermoplastic composites have a lower weight than metals and are more environmentally friendly and recyclable than thermoset materials. Therefore, the continuous fiber thermoplastic composite material in the new energy field has the advantages of low specific gravity, high strength and the like, and has become an industrial trend for replacing metal materials and thermosetting materials.
CN 109353031a discloses a method for preparing a battery case cover, which comprises laying a prepreg layer, an SMC layer and a prepreg layer on a mold core to obtain a preform, placing the preform in a vacuum-pumping device, and vacuumizing and pre-compacting; then placing the mould on a preheated male mould, closing the mould, curing and shaping. The method adopts thermosetting materials for preparation, which is not environment-friendly and has a long period.
CN 111703056A discloses a composite material battery cover plate and a preparation method thereof, wherein a continuous fiber reinforced thermoplastic composite material laminated plate is cut to obtain a two-dimensional special-shaped laminated plate; heating the cut special-shaped laminated plate; quickly transferring the heated special-shaped laminated plate to a forming die; rapidly closing and pressurizing the die; demolding to obtain a battery cover plate mold pressing part; and finally, trimming and punching the die pressing part of the battery cover plate to obtain the cover plate. The method needs to preheat the plate in advance, the preheating process is not easy to control, the problems that the material is insufficiently preheated, the molding fiber is difficult to break, the preheating excessive resin is dropped in advance easily occur, the temperature of the molding die is low, the resin cannot be sufficiently melted and flowed in the die, and the product appearance is poor. .
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and the preparation method thereof, so that the main forming efficiency of the product is improved, the process is simple, and the purposes of mechanical and continuous automatic production can be achieved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate is characterized in that a continuous fiber reinforced thermoplastic prepreg is prepared by adopting a phosphorus and nitrogen system halogen-free flame retardant system through extremely hot and extremely cold mold forming and machining.
Further, the continuous fiber reinforced thermoplastic prepreg comprises a continuous fiber reinforced thermoplastic woven cloth prepreg, a continuous fiber resin reinforced thermoplastic mixed woven cloth prepreg or a continuous fiber reinforced thermoplastic unidirectional prepreg tape; the woven cloth prepreg, the mixed woven cloth prepreg and the prepreg tape are composite materials of woven cloth, mixed woven cloth continuous fibers and thermoplastic resin melt prepreg, and the single-layer thickness of the composite materials is 0.1-0.5 mm; the woven fabric and the mixed woven fabric are fabrics with various weaving methods, including plain fabrics, twill fabrics, satin fabrics and the like; the continuous fiber reinforced thermoplastic unidirectional prepreg tape is laid up through different angles, preferably 0 °/90 ° or 0 °/45 °.
Further, the continuous fiber reinforced thermoplastic prepreg is made of a thermoplastic resin including 25 to 60% by weight and continuous fibers including 40 to 75% by weight.
Further, the continuous fiber reinforced thermoplastic prepreg has an outer layer, namely the first layer and the third layer, having a fiber mass content of 40-50%, and an intermediate layer, namely the second layer, having a fiber mass content of 60-75%.
The thermoplastic resin comprises polyethylene, polypropylene, polycaprolactam, polyhexamethylene diamine adipate, polycarbonate, polyphenylene sulfide or polyether ether ketone and the like, and the resin material can be selected according to the requirement; the continuous fibers comprise glass fibers, carbon fibers, basalt fibers, aramid fibers and the like, and can be selected according to required grades.
Further, the female die of the hot-electrode cold die is arranged below the male die, and the temperature of the bending area of the die is 20-50 ℃ higher than that of the plane area; the preparation method adopts an electromagnetic heating mode, the electromagnetic heating device is embedded in the mold, the electromagnetic heating area is close to the appearance surface of the mold, and after the cooling area is positioned in the electromagnetic heating area, the average heating/cooling speed is 200-plus 500 ℃/min, preferably 300 ℃/min.
The invention also provides a preparation method of the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate, which comprises the following steps:
A. heating and warming the extremely hot and extremely cold mold: the temperature of the plane area of the die is set to be 30-60 ℃ higher than the thermal deformation temperature of the continuous fiber reinforced thermoplastic prepreg, the temperature of the bending area is set to be 50-110 ℃ higher than the thermal deformation temperature of the continuous fiber reinforced thermoplastic prepreg, and the heating duration is 50-60 s;
B. the continuous fiber reinforced thermoplastic prepreg layup: uniformly spreading layers of the continuous fiber reinforced thermoplastic prepreg according to the material structure design;
C. continuous fiber reinforced thermoplastic prepreg placement: placing the prepreg after laying on a die female die for 5-15 s;
D. closing the die and maintaining the pressure: slowly closing the mold, controlling the time to be 20-60s, and finishing heat preservation and pressure maintaining for 5-35s after closing the mold so as to fully fill the mold with the molten resin; the pressure for maintaining the pressure is 0.1-10 MPa;
E. cooling and opening the die: opening the mold when the temperature of the mold is cooled to below 85 ℃, and cooling for 50-60 s;
F. trimming and drilling: taking out the semi-finished product, and trimming and making holes according to the mounting hole positions of the battery packs.
Furthermore, the invention provides a composite material battery pack cover plate, and the battery pack cover plate is prepared by the method.
Compared with the prior art, the invention has the advantages that:
according to the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and the preparation method thereof, the halogen-free flame-retardant continuous fiber reinforced thermoplastic composite material is selected, the extremely hot and extremely cold mold is adopted, the processing technology is controlled, and the battery cover plate is prepared through material structure design and mold heating and cooling temperature design, so that the product is light in weight, high in strength, smooth in appearance and excellent in waterproof and flame-retardant properties. The thickness of the product is 0.6-1.5mm, the halogen-free flame retardant is a phosphorus and nitrogen flame retardant system, and the flame retardant grade of the material reaches UL94V0 grade. The invention has simple process, no need of pretreatment of materials, realization of mechanized, continuous and automatic production, controllable production molding period within 4 minutes and high molding efficiency.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below.
FIG. 1 is a schematic view of an extremely hot and extremely cold mold according to example 1; in the figure: 1-1 male die cooling pipeline, 1-2 male die bending zones, 1-3 male die plane zones, 1-4 female die plane zones, 1-5 female die bending zones and 1-6 female die cooling devices, wherein 1-7 are male die plane electromagnetic heating zones, 1-8 are male die bending zone electromagnetic heating zones, 1-9 female die plane electromagnetic heating zones and 1-10 female die bending zone electromagnetic heating zones.
FIG. 2 is a schematic diagram of an extremely hot and extremely cold mold with evacuation function; in the figure: the vacuum mold comprises a vacuum cover 1-0, a male mold cooling pipeline 1-1, a male mold bending area 1-2, a male mold plane area 1-3, a female mold plane area 1-4, a female mold bending area 1-5 and a female mold cooling device 1-6, wherein the male mold plane electromagnetic heating area 1-7, the male mold bending area electromagnetic heating area 1-8, the female mold plane electromagnetic heating area 1-9 and the female mold bending area electromagnetic heating area 1-10 are respectively arranged in the vacuum cover.
FIG. 3 is a schematic view of a molding process in example 1; in the figure: 1-preparing prepreg paving, 2-placing the prepreg, 3-closing the mold and maintaining the pressure, 4-cooling and opening the mold, and 5-taking out a semi-finished product.
FIG. 4 is a schematic view of a vacuum forming process; in the figure: 1-prepreg laying preparation, 2-prepreg placement, 3-mold closing and vacuum exhaust, 4-cooling and mold opening, and 5-trimming and hole making.
FIG. 5 is a schematic view of the semi-finished product after trimming and hole making; in the figure: and 5-1 hole site, which is matched with the battery pack assembly mounting hole site.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention, but the embodiments of the present invention are not limited thereto.
Example 1:
a halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate is prepared, the flame-retardant grade is UL94V0, the flame-retardant system is a melamine polyphosphate compound, and each layer of 0.9mm prepreg is shown in Table 1.
Table 1 example 1 table of each layer of prepreg
The method comprises the following steps of (1) adopting an extremely hot and extremely cold die shown in figure 1, wherein a female die is arranged below, a male die is arranged above, and the temperature of a bending area of the die is 20 ℃ higher than that of a plane area; the electromagnetic heating device is embedded in the mold, the electromagnetic heating area is close to the appearance surface of the mold, and after the cooling area is positioned in the electromagnetic heating area, the average heating/cooling speed is 300 ℃/min. The preparation flow is shown in figure 3 and comprises the following steps:
heating the die: the continuous fiber reinforced thermoplastic prepreg of example 1 had a heat distortion temperature of 220 ℃, a die plane temperature of 250 ℃, a bending zone temperature of 270 ℃ and a heating duration of 60 seconds.
B. Laying a prepreg: uniformly spreading layers of each prepreg according to the material structure design in the table 1;
C. placing a prepreg: placing the prepreg after laying on a die female die for 15 s;
D. closing the die and maintaining the pressure: slowly closing the mold, controlling the mold closing time to be 50s, and keeping the temperature and pressure for 20s after the mold closing is completed, so that the molten resin is fully filled into the mold, and the pressure for keeping the pressure is 5 MPa.
E. Cooling and opening the die: cooling to 85 deg.C, opening the mold, and cooling for 60 s.
F. Trimming and drilling: taking out the semi-finished product, trimming and making holes. After trimming and punching the semi-finished product, the semi-finished product is shown in figure 5.
Example 2:
the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate is prepared, the flame-retardant grade is UL94V0, the flame-retardant system is a piperazine pyrophosphate compound, and the proportion of each layer of 1.5mm prepreg is shown in Table 2.
Table 2 example 2 table of each layer of prepreg
The method comprises the following steps of (1) adopting an extremely hot and extremely cold die shown in FIG. 2, wherein a female die is arranged below, a male die is arranged above, and the temperature of a bending area of the die is 50 ℃ higher than that of a plane area; the electromagnetic heating device is embedded in the mold, the electromagnetic heating area is close to the appearance surface of the mold, and after the cooling area is positioned in the electromagnetic heating area, the average heating/cooling speed is 300 ℃/min.
The preparation flow is shown in figure 4 and comprises the following steps:
A. heating the die: the thermal deformation temperature of the continuous fiber reinforced thermoplastic prepreg of example 2 was 150 ℃, the die plane temperature was set at 210 ℃, the bending zone temperature was set at 260 ℃, and the temperature rise time was set at 50 s.
B. Laying a prepreg: uniformly spreading layers of each prepreg according to the material structure design in the table 2;
C. placing a prepreg: placing the prepreg after laying on a die female die for 10 s;
D. closing the die, maintaining pressure and vacuumizing: slowly closing the mold, controlling the mold closing time at 60s, setting the vacuum degree to be-0.1 MPa, and completing heat preservation and pressure maintenance for 35s after mold closing so that the molten resin fully fills the mold, wherein the pressure maintaining pressure is 10 MPa.
E. Cooling and opening the die: cooling to 85 deg.C, opening the mold, and cooling for 60 s.
F. Trimming and drilling: taking out the semi-finished product, trimming and making holes. After trimming and punching the semi-finished product, the semi-finished product is shown in figure 5.
Example 3:
a halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate is prepared, the flame-retardant grade is UL94V0, the flame-retardant system is melamine polyphosphate compound, and the proportion of each layer of 0.6mm prepreg is shown in Table 3.
Table 3 example 3 table of each layer of prepreg
The method comprises the following steps of (1) adopting an extremely hot and extremely cold die shown in figure 1, wherein a female die is arranged below, a male die is arranged above, and the temperature of a bending area of the die is 50 ℃ higher than that of a plane area; the electromagnetic heating device is embedded in the mold, the electromagnetic heating area is close to the appearance surface of the mold, and after the cooling area is positioned in the electromagnetic heating area, the average heating/cooling speed is 300 ℃/min.
The preparation flow is shown in figure 3 and comprises the following steps:
A. heating the die: the continuous fiber reinforced thermoplastic prepreg of example 3 had a heat distortion temperature of 210 ℃, a die plane temperature of 240 ℃, a bending zone temperature of 290 ℃ and a temperature rise time of 58 s.
B. Laying a prepreg: uniformly spreading layers of each prepreg according to the material structure design in the table 3;
C. placing a prepreg: placing the prepreg after laying on a die female die for 5 s;
D. closing the die and maintaining the pressure: slowly closing the mold, controlling the mold closing time to be 20s, and finishing the mold closing for 5s of heat preservation and pressure maintaining to ensure that the molten resin fully fills the mold, wherein the pressure maintaining pressure is 0.1 MPa.
E. Cooling and opening the die: cooling to 85 deg.C, opening the mold, and cooling for 50 s.
F. Trimming and drilling: taking out the semi-finished product, trimming and making holes. After trimming and punching the semi-finished product, the semi-finished product is shown in figure 5.
The comparison of the performances of the examples 1-3 and SMC is shown in Table 4, and the table 4 shows that the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate prepared by the invention has excellent flame retardant performance and has the advantages of obviously improved strength, light weight, short forming time, high efficiency and the like.
TABLE 4 comparison of examples 1-3 with SMC Performance
| Item | Example 1 | Example 2 | Example 3 | SMC |
| Shaping time min | 3.41 | 3.59 | 2.7 | 10 |
| Thickness mm | 0.9 | 1.5 | 0.6 | 2mm |
| Density g/cm3 | 1.61 | 1.50 | 1.70 | 1.80 |
| Appearance of the product | Is flat and smooth | Is flat and smooth | Is flat and smooth | Rough surface |
| Tensile strength MPa | 350 | 500 | 320 | 65 |
| Flame retardant rating (UL94) | V0 | V0 | V0 | V0 |
Claims (10)
1. The preparation method of the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate is characterized in that the battery cover plate is prepared from a continuous fiber reinforced thermoplastic prepreg by adopting a phosphorus and nitrogen system halogen-free flame retardant system through extremely hot and extremely cold mold forming and machining.
2. The method for preparing the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate according to claim 1, wherein the continuous fiber reinforced thermoplastic prepreg comprises a continuous fiber reinforced thermoplastic woven fabric prepreg, a continuous fiber resin reinforced thermoplastic mixed woven fabric prepreg, or a continuous fiber reinforced thermoplastic unidirectional prepreg tape; the woven cloth prepreg, the mixed woven cloth prepreg and the prepreg tape are composite materials of woven cloth, mixed woven cloth continuous fibers and thermoplastic resin melt prepreg, and the single-layer thickness of the composite materials is 0.1-0.5 mm; the woven fabric and the mixed woven fabric are fabrics with various weaving methods, including plain fabrics, twill fabrics and satin fabrics; the continuous fiber reinforced thermoplastic unidirectional prepreg tape is layered through different angles.
3. The preparation method of the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate according to claim 1, wherein the continuous fiber reinforced thermoplastic prepreg comprises three layers, the mass content of the fibers of the outer layer, namely the first layer and the third layer is 40-50%, respectively, and the mass content of the fibers of the middle layer, namely the second layer is 60-70%.
4. The method for preparing a halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate according to claims 1-2, wherein the continuous fiber reinforced thermoplastic prepreg is made of 25-60% by weight of thermoplastic resin and 40-75% by weight of continuous fiber.
5. The method for preparing the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate according to claim 2, wherein the continuous fiber reinforced thermoplastic unidirectional prepreg tape is layered through different angles, wherein the angles are 0 °/90 ° or 0 °/45 °.
6. The halogen-free flame retardant continuous fiber reinforced thermoplastic battery cover plate and the preparation method thereof according to claim 4, wherein the thermoplastic resin comprises polyethylene, polypropylene, polycaprolactam, polyhexamethylene adipate, polycarbonate, polyphenylene sulfide or polyether ether ketone; the continuous fiber comprises glass fiber, carbon fiber, basalt fiber and aramid fiber.
7. The preparation method of the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate according to claim 1, wherein the hot and cold mold is arranged with a female mold at the lower part and a male mold at the upper part, and the temperature of the bending area of the mold is 20-50 ℃ higher than that of the plane area; the preparation method adopts an electromagnetic heating mode, the electromagnetic heating device is embedded in the mold, the electromagnetic heating area is close to the appearance surface of the mold, and after the cooling area is positioned in the electromagnetic heating area, the average heating/cooling speed is 200-plus 500 ℃/min.
8. The halogen-free flame retardant continuous fiber reinforced thermoplastic battery cover plate and the preparation method thereof according to claim 7, wherein the heating/cooling speed is 300 ℃/min.
9. The preparation method of the halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate according to claim 1, characterized by comprising the following steps:
A. heating and warming the extremely hot and extremely cold mold: the temperature of the plane area of the die is set to be 30-60 ℃ higher than the thermal deformation temperature of the continuous fiber reinforced thermoplastic prepreg, the temperature of the bending area is set to be 50-110 ℃ higher than the thermal deformation temperature of the continuous fiber reinforced thermoplastic prepreg, and the heating duration is 50-60 s;
B. the continuous fiber reinforced thermoplastic prepreg layup: uniformly spreading layers of the continuous fiber reinforced thermoplastic prepreg according to the material structure design;
C. continuous fiber reinforced thermoplastic prepreg placement: placing the prepreg after laying on a die female die for 5-15 s;
D. closing the die and maintaining the pressure: slowly closing the mold, controlling the time to be 20-60s, and finishing heat preservation and pressure maintaining for 5-35s after closing the mold so as to fully fill the mold with the molten resin; the pressure for maintaining the pressure is 0.1-10 MPa;
E. cooling and opening the die: opening the mold when the temperature of the mold is cooled to below 85 ℃, and cooling for 50-60 s;
F. trimming and drilling: taking out the semi-finished product, and trimming and making holes according to the mounting hole positions of the battery packs.
10. A composite battery cover sheet, characterized in that it is prepared by the method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111512466.6A CN114193792A (en) | 2021-12-07 | 2021-12-07 | Halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111512466.6A CN114193792A (en) | 2021-12-07 | 2021-12-07 | Halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114193792A true CN114193792A (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111512466.6A Pending CN114193792A (en) | 2021-12-07 | 2021-12-07 | Halogen-free flame-retardant continuous fiber reinforced thermoplastic battery cover plate and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114193792A (en) |
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2021
- 2021-12-07 CN CN202111512466.6A patent/CN114193792A/en active Pending
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