KR102253108B1 - Composite material for battery pack case - Google Patents

Abstract

A composite material for a battery pack case with electromagnetic wave shielding performance is provided while improving the mechanical properties and safety of the battery pack. The composite material for the battery pack case includes a flame retardant layer and a metal layer disposed on the flame retardant layer. The thickness of the metal layer is 20 nm to 100 μm.
The flame-retardant layer includes a laminate including fibrous layers including continuous fibers oriented in-plane, at least one metal mesh disposed between the fibrous layers, and a flame-retardant resin substrate impregnated in the laminate. The fibrous layers are stacked in the thickness direction of the flame retardant layer so that the oriented surfaces of the continuous fibers face each other.
The opening of the at least one metal mesh is 1 μm to 100 μm.

Description

Composite material for battery pack case{COMPOSITE MATERIAL FOR BATTERY PACK CASE}

The present invention relates to a composite material for a battery pack case.

Lithium-ion secondary batteries are used as power sources for portable electronic devices, electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and energy storage devices. Lithium-ion secondary batteries are commercialized in the form of a battery pack in which a battery cell, a protection circuit, and a protection device are set in a case.

Lithium-ion secondary batteries have a problem in that they explode or generate fire due to generation of combustible gas due to a decomposition reaction of an electrolyte, combustible gas due to a reaction between an electrolyte and an electrode, and oxygen due to decomposition of a positive electrode.

Electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, energy storage devices, and the like, require a large amount of power to be supplied, so the risk of a secondary explosion is very high.

Meanwhile, since electronic components are embedded in the battery pack, electromagnetic waves are generated therefrom. Electromagnetic waves radiated or conducted from the battery pack may impair the function of other devices, cause infertility, etc. by causing abnormalities in the reproductive organs of the user, or damage to the eyeball, causing cataracts, etc., and may cause headaches. Sometimes it does.

The present invention is to provide a composite material for a battery pack case that can improve the mechanical properties and safety of the battery pack.

In addition, the present invention is to provide a composite material for a battery pack case having electromagnetic wave shielding performance.

However, the technical problem to be achieved by the present invention is not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The composite material for a battery pack case according to the present invention includes a flame retardant layer and a metal layer disposed on the flame retardant layer. The thickness of the metal layer is 20 nm to 100 μm.

The flame-retardant layer includes a laminate including fibrous layers including continuous fibers oriented in-plane, at least one metal mesh disposed between the fibrous layers, and a flame-retardant resin base material impregnated in the laminate. The fibrous layers are laminated in the thickness direction of the flame retardant layer so that the oriented surfaces of the continuous fibers face each other.

The opening of the at least one metal mesh is 1 μm to 100 μm.

The composite material for a battery pack case according to the present invention can secure flame resistance through a flame retardant layer.

In the discontinuous fiber composite material, compared to the continuous fiber composite material, since more resin substrates may be interposed between discontinuous fibers such as short fibers, there are more spaces and interfaces in which the resin substrate may be burned.

The flame-retardant layer includes a laminate including fibrous layers including continuous fibers oriented in-plane, at least one metal mesh disposed between the fibrous layers, and a flame-retardant resin base material impregnated in the laminate. Since the fiber layers are stacked in the thickness direction of the flame-retardant layer so that the oriented surfaces of the continuous fibers face each other, when a flame is applied in the thickness direction of the composite material for the battery pack case, the flame-retardant layer is the battery pack compared to the discontinuous fiber composite material. Since the flame propagation path in the thickness direction of the case composite material can be reduced, improved flame retardant performance can be provided to the composite material for the battery pack case.

In addition, the composite material for a battery pack case according to the present invention can improve the safety of the battery pack against local heating due to an abnormal reaction inside the battery cell through the metal layer.

In addition, since the composite material for a battery pack case according to the present invention can reinforce the reinforcing part through the design of the fiber layers, it is mechanical for protecting the battery cell compared to the discontinuous fiber composite material in which the discontinuous fibers are arranged in a negative direction. It has an advantageous advantage in improving physical properties.

In addition, the flame retardant layer includes a metal layer and at least one metal mesh. Through the metal layer and the metal mesh, the composite material for a battery pack case according to the present invention may exhibit radio wave shielding performance.

The effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic cross-sectional view of an example of a composite material for a battery pack case, and shows that a metal layer is directly bonded to a flame retardant layer.
FIG. 2 is a schematic diagram of an example of the flame-retardant layer of FIG. 1, and shows an arrangement of continuous fibers and a laminate of metal meshes impregnated with a flame-retardant resin.
3 is a schematic diagram of another example of a flame-retardant layer, and shows that a laminate of a woven fabric of continuous fibers and a metal mesh is impregnated with a flame-retardant resin.
4 is a schematic diagram of another example of a flame retardant layer, and shows a laminate of non-crimp fabric (NCF) fabrics of continuous fibers and a metal mesh impregnated with a flame-retardant resin.
5 is a schematic diagram of another example of a flame retardant layer, and shows a stacked structure of UD prepregs and metal meshes.
6 is a schematic diagram of another example of a flame retardant layer, and shows a laminated structure of fabric prepregs and metal meshes.
7 is a schematic cross-sectional view of an example of a composite material for a battery pack case, showing that a bonding layer is interposed on the flame retardant layer and the metal layer.
8 is a schematic cross-sectional view of an example of a composite material for a battery pack case, and shows that a flame-retardant porous layer is interposed between fiber layers.

Advantages and features of the invention, and a method of achieving them will become apparent with reference to embodiments and experimental examples to be described later in detail together with the accompanying drawings. It should be noted that the accompanying drawings are only for easily understanding the spirit of the technology disclosed in the present specification, and should not be construed as limiting the spirit of the technology by the accompanying drawings.

In addition, the invention is not limited to the content disclosed below, but may be implemented in various forms, and the content disclosed below makes the disclosure of the invention complete, and the invention is for those of ordinary skill in the art to which the invention pertains. It is provided to fully inform the scope of the invention, and the invention is only defined by the scope of the claims.

If it is determined that a detailed description of a related known technology may obscure the gist of the technology, the detailed description may be omitted. The same reference numerals refer to the same elements throughout the specification. In the drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity of description.

Although the first, second, and the like are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from another component, and unless otherwise stated, the first component may be the second component.

Throughout the specification, unless otherwise specified, each component may be singular or plural. Throughout the specification, when a part refers to "including" or "having" a certain component, this does not exclude other components, but further includes other components, unless specifically stated to the contrary. It means something that can be included.

Throughout the specification, when referred to as "A and/or B", it means A, B or A and B, unless otherwise specified, and when referred to as "C to D", it means that a special opposite description is Unless there is one, it means that it is C or more and D or less.

Spatially relative terms "below", "beneath", "lower", "above", "upper", etc. It may be used to easily describe the correlation between the device or components and other devices or components. Spatially relative terms should be understood as terms including different directions of the device during use or operation in addition to the directions shown in the drawings.

1 is a schematic cross-sectional view of an example of a composite material 100 for a battery pack case, and shows that the metal layer 20 is directly bonded to the flame retardant layer 10. FIG. 2 is a schematic diagram of an example of the flame-retardant layer 10 of FIG. 1, and shows an example in which the fiber layers F1, F2, and F3 are each made of continuous fibers 1 oriented in one direction.

1 and 2, the composite material 100 for a battery pack case includes a flame retardant layer 10 and a metal layer 20 directly bonded to the flame retardant layer 10. The composite material 100 for the battery pack case can secure flame resistance through the flame-retardant layer 10, and through the metal layer 20, the high heat source caused by abnormalities in the battery cell Decomposition can be controlled.

The flame-retardant layer 10 includes a laminate of fibrous layers F1, F2, and F3 and metal meshes M1 and M2, and a flame-retardant resin substrate P. The flame-retardant resin substrate P is impregnated in a laminate of the fibrous layers F1, F2 and F3 and the metal meshes M1 and M2. The flame-retardant layer 10 is HP-RTM (HIGH-PRESSURE RESIN TRANSFER) impregnated with a flame-retardant resin base material (P) in a laminate of fibrous layers (F1, F2, F3) and metal meshes (M1, M2), and then cured. It can be obtained by the MOLDING) method.

The fiber layers (F1, F2, F3) are each composed of continuous fibers 1 oriented in one direction in a plane, and the thickness direction of the flame retardant layer 10 so that the oriented surfaces of the continuous fibers 1 face each other. Alternatively, it is laminated in the thickness direction of the composite material 100 for a battery pack case, and the metal meshes M1 and M2 are disposed between the fiber layers F1, F2, and F3.

The laminated structure between the fibrous layers F1, F2, and F3 may be designed according to mechanical properties required for the composite material 100 for a battery pack case. The laminated structure between the fibrous layers F1, F2, and F3 may be designed to be anisotropic for reinforcing rigidity. However, in order to limit the problem of unintended post-deformation, it is preferable that the stacked structure between the fiber layers F1, F2, and F3 is a symmetrical stacked structure in the thickness direction of the composite material 100 for a battery pack case.

Since the flame-retardant layer 10 is composed of a flame-retardant continuous fiber composite material, the composite material 100 for a battery pack case can exhibit improved flame retardant performance compared to the discontinuous fiber composite material. In the discontinuous fiber composite material such as short fibers or long fibers, since more resin substrates may be interposed between the discontinuous fibers, there are more spaces and interfaces in which the resin substrate may be burned.

On the other hand, the composite material 100 for the battery pack case is laminated in the thickness direction of the flame retardant layer 10 so that the fiber layers F1, F2, F3 face the oriented surfaces of the continuous fibers 1, and the flame retardant layer 10 ) Contains a flame-retardant resin base material (P), when a flame is applied in the thickness direction of the composite material 100 for a battery pack case, in the thickness direction of the composite material 100 for a battery pack case through the flame-retardant layer 10 It can shorten the flame propagation path.

The flame-retardant resin base material P may be composed of a flame-retardant thermosetting plastic or a flame-retardant thermoplastic. Examples of the flame-retardant thermosetting plastic include at least one of a flame-retardant epoxy resin, a flame-retardant urethane resin, a flame-retardant phenol resin, a flame-retardant urea resin, and a flame-retardant melamine resin. Examples of flame-retardant thermoplastic plastics include at least one of polyphenylene sulfide (PPS), flame-retardant prescription polycarbonate (PC), and flame-retardant polyamide (PA).

The flame-retardant thermosetting plastic or flame-retardant thermoplastic plastic may be prepared by adding a known flame retardant to the thermosetting plastic or thermoplastic plastic, and examples of the known flame retardant include a halogen-based flame retardant and/or a non-halogen-based flame retardant. In terms of toxicity and environmental friendliness, a non-halogen-based flame retardant may be used as a flame retardant, and examples of the non-halogen-based flame retardant include a phosphorus-based flame retardant.

The continuous fibers (1) are composed of a material having good heat resistance, for example, glass fiber, carbon fiber, aramid fiber, a combination of glass fiber and carbon fiber, a combination of glass fiber and aramid fiber, and a combination of carbon fiber and aramid fiber. It may be a blend or blend of glass fibers, carbon fibers and aramid fibers. The fraction of the continuous fibers 1 in the flame retardant layer 10 is 35% by volume to 60% by volume.

The metal layer 20 may be made of, for example, a metal having high thermal conductivity, such as silver, aluminum, or copper, or an alloy thereof. A composite material 100 for a battery pack case may be obtained in which the metal layer 20 is directly bonded on the flame retardant layer 10 by using a metal deposition method or a metal coating method.

The metal meshes M1 and M2 may serve as a flow network for securing the flowability of the flame-retardant resin substrate P and may provide electromagnetic wave shielding performance to the composite material 100 for a battery pack case. Examples of the metal constituting the metal meshes M1 and M2 include aluminum or an alloy thereof, copper or an alloy thereof.

The openings of the metal meshes M1 and M2 may be 1 μm to 100 μm. When the openings of the metal meshes M1 and M2 are less than 1 µm, the flowability of the flame-retardant resin base material P decreases, and a high pressure condition must be accompanied in order to pass through the micropore. If the opening exceeds 100 µm, it is impossible to secure electromagnetic wave shielding performance.

The metal layer 20 may provide non-flammable and radio wave shielding performance to the composite material 100 for a battery pack case.

The thickness of the metal layer 20 is 20 nm to 100 μm. When the thickness of the metal layer 20 is less than 20 nm, it is impossible to shield electromagnetic waves of 60 dB or more. When the thickness of the metal layer 20 is more than 100 μm, the electromagnetic wave shielding performance may be improved, but the weight reduction effect due to the increase in the weight of the metal layer 20 is reduced, so that the weight reduction rate of the battery pack carrier applied with the composite material 100 for the battery pack case is reduced. Decrease.

On the other hand, if the metal layer 20 becomes thick, the non-flammable performance may be stable, but making the metal layer 20 of 100 µm or larger by the deposition and coating process is not economically valuable because the process cost increases, and when a thin metal film is introduced, various Due to different coefficients of thermal expansion in a vehicle use temperature environment, problems of post-deformation and peeling of the metal layer 20 may be caused by thermal expansion of the metal layer 20 in the outermost layer. Accordingly, the thickness of the metal layer 20 may be in the range of 20 nm to 100 μm.

3 is a schematic diagram of another example of a flame-retardant layer (WF), a flame-retardant resin substrate (P) in a laminate of woven fabrics (WF1, WF2) and a metal mesh (Me1) of continuous fibers (1, 2) It shows the impregnation of.

Referring to FIG. 3, the woven fabric fabrics WF1 and WF2 have a structure in which a weft yarn 1 made of continuous fibers and a warp yarn 2 made of continuous fibers cross upward and downward. The metal mesh Me1 is disposed between the woven fabric fabrics WF1 and WF2, and the woven fabric fabrics WF1 and WF2 are stacked in the thickness direction of the flame retardant layer WF.

The flame-retardant layer (WF) is HP-RTM, which is hardened after impregnating the laminate of the woven fabrics (WF1, WF2) of the continuous fibers (1, 2) and the metal mesh (Me1) with a flame-retardant resin base material (P). It can be obtained by the (HIGH-PRESSURE RESIN TRANSFER MOLDING) method.

Figure 4 is a schematic diagram of another example of a flame retardant layer (NCF), non-crimp reinforcing fiber fabric (non-crimp fabric; NCF) fabrics (NCF1, NCF2) and metal mesh of the continuous fibers (1, 2) ( It shows that the laminate of Me2) is impregnated with a flame-retardant resin base material (P).

Referring to FIG. 4, the NCF fabrics NCF1 and NCF2 do not cause bending because the constituent fibers are arranged almost linearly, unlike woven fabric fabrics (see WF1 and WF2 in FIG. 3). Although not shown, in the NCF fabrics NCF1 NCF2, constituent fibers are stitched or bonded.

The metal mesh Me2 is disposed between the NCF fabrics NCF1 and NCF2, and the NCF fabrics NCF1 and NCF2 are stacked in the thickness direction of the flame retardant layer NCF.

A laminate of NCF fabrics (NCF1, NCF2) and metal mesh (Me2) may have different orientation directions of the continuous fibers 1 and 2 of each layer, for example, the continuous fibers of each layer ( NCF fabrics (NCF1, NCF2) may be stacked so that the orientation direction of 1 and 2) is 0°/+45°/90°/-45° or 0°/90°/0°/90°. 4 shows a case where the orientation direction of the continuous fibers 1 and 2 of each layer is 0°/90°/0°/90°, but is not limited thereto.

The flame-retardant layer (NCF) is HP-RTM, which is hardened after impregnating a laminate of NCF fabrics (NCF1, NCF2) and metal mesh (Me2) of continuous fibers (1, 2) with a flame-retardant resin base material (P). It can be obtained by the HIGH-PRESSURE RESIN TRANSFER MOLDING) method.

5 is a schematic diagram of another example of a flame retardant layer UD, and shows a stacked structure of UD prepregs UD1, UD2, and UD3 and metal meshes M1 and M2. 6 is a schematic diagram of another example of the flame retardant layer FP, and shows a stacked structure of the raw prepregs FP1, FP2, and FP3 and the metal meshes M1 and M2.

2 to 4 illustrate flame-retardant layers 10, WF, and NCF obtained using the HP-RTM (HIGH-PRESSURE RESIN TRANSFER MOLDING) method. Unlike the flame-retardant layers 10, WF, and NCF of FIGS. 2 to 4, the flame-retardant layers UD and FP are of the UD prepregs UD1 and UD2 and/or the original prepregs FP1 and FP2. It can be obtained by curing or laminating the laminate.

Referring to Figure 5, UD prepregs (UD1, UD2) is a flame-retardant resin base material (P) in a fibrous layer (see F1, F2, F3 in Figure 1) consisting of continuous fibers (1, 2) oriented in one direction. The structure is impregnated, and the flame retardant layer UD can be obtained by laminating UD prepregs UD1 and UD2.

Referring to Figure 6, the fabric prepregs (FP1, FP2) is a woven fabric fabric layer made of continuous fibers (1, 2), respectively (see WF1, WF2 in Figure 2) or an NCF fabric fiber layer (NCF1 in Figure 3, NCF2) is impregnated with a flame retardant resin base material. The flame retardant layer (FP) may be obtained by laminating woven fabric prepregs (FP1, FP2) or non-crimp reinforcing fiber (NCF) fabric prepregs (FP1, FP2).

5 and 6, the one-way orientation directions of the continuous fibers 1 and 2 of each layer may be alternated with each other. For example, the flame-retardant layers UD and FP include a first layer in which one direction of the continuous fibers 1 and 2 of each layer is a first direction, and a second layer in which one direction of the continuous fibers is a second direction. A layer may be included, and the first direction and the second direction may be alternated with each other. For example, the second layer may be disposed on the first layer.

The first direction may have an angle of +θ° with respect to the reinforcement required direction, and the second direction may have an angle of -θ° with respect to the reinforcement required direction. In this case, θ° may be 1° to 44°. For example, an angle of intersection between the first and second directions may be 30° to 90°.

'Reinforcement request direction' is a predetermined direction in which strength and rigidity need to be supplemented in consideration of external force or load applied from the outside when the battery pack case is mounted on a vehicle, or when the vehicle is operated and moved after installation. Means. The direction required for reinforcement may be determined by a restraint position and an installation condition when the battery pack is mounted to a component such as a vehicle, and most principally refers to one direction in which strength and rigidity need to be supplemented.

Fiber layers (F1, F2, F3, WF1, WF2, NCF1, NCF2, UD1, UD2, UD3, FP1, FP2) provided in the flame-retardant layers 10, WF, NCF, UD, FP in FIGS. 2 to 6 The number of FP3) is exemplary, and the number of fiber layers F1, F2, F3, WF1, WF2, NCF1, NCF2, UD1, UD2, UD3, FP1, FP2, FP3) is not limited only to the illustrated one. Similarly, the number of metal meshes M1, M2, Me1, Me2 provided in the flame retardant layers 10, WF, NCF, UD, and FP in FIGS. 2 to 6 is exemplary, and the flame retardant layer 10, WF The number of metal meshes (M1, M2, Me1, Me2) provided in (NCF, UD, FP) is not limited to the illustrated one.

7 shows a composite material 101 for a battery pack case in which the bonding layer 30 is interposed on the flame retardant layer 10 and the metal layer 20.

When forming the metal layer 20 by bonding a metal thin film to the flame-retardant layer 10 using an adhesive or hot press bonding method, the composite material 100 for a battery pack case includes the flame-retardant layer 10 and the metal layer 20 ) It further includes a bonding layer 30 interposed between.

The bonding layer 30 may be one or more, and at least one bonding layer 30 may include at least one of a non-flammable resin layer, a flame-retardant resin layer, a non-flammable resin layer containing discontinuous fibers, and a flame-retardant resin layer containing discontinuous fibers. have.

For example, when the continuous fibers of the flame-retardant layer 10 are composed of carbon fibers and the bonding layer 30 is a non-flammable resin layer or a flame-retardant resin layer, the bonding layer 30 is a non-conductive layer, and a composite for a battery pack case The material 101 may have a structure in which a non-conductive layer is interposed between the flame retardant layer 10 and the metal layer 20.

For example, when the continuous fibers of the flame retardant layer 10 are composed of carbon fibers, the bonding layer 30 is a discontinuous fiber non-flammable resin layer or a discontinuous fiber flame retardant resin layer, and the discontinuous fibers are non-conductive fibers such as glass fibers , The bonding layer 30 is a non-conductive layer, and the composite material 101 for a battery pack case may have a structure in which a non-conductive layer is interposed between the flame retardant layer 10 and the metal layer 20.

8 is a schematic cross-sectional view of an example of a composite material 102 for a battery pack case. Referring to FIG. 8, the flame-retardant porous layer 11 may be interposed between the fibrous layers (F) and between the fibrous layers (F) and the metal mesh (M). Although not shown, the flame-retardant porous layer 11 may be interposed only between the fibrous layers F without the metal mesh M being interposed therebetween.

Example 1

Using 4 sheets of glass continuous fiber NCF fabric and 1 sheet of aluminum metal mesh with an opening of 10 µm, a 3.2 mm thick flame-retardant laminate was manufactured, and then a silver (Ag) layer was formed to a thickness of 20 nm through spray coating. A composite material for a pack case was obtained.

One sheet of aluminum metal mesh having an opening of 10 μm was laminated between the glass continuous fiber NCF fabrics. The flame-retardant laminate contained 50% by volume of continuous glass fiber and 50% by volume of flame retardant epoxy.

Example 2

Using 4 sheets of glass continuous fiber NCF fabric and 1 sheet of aluminum metal mesh with an opening of 50 µm, a 3.2 mm thick flame-retardant laminate was manufactured, and then a silver (Ag) layer was formed to a thickness of 20 nm through spray coating. A composite material for a pack case was obtained.

One sheet of aluminum metal mesh having an opening of 50 µm was laminated between the glass continuous fiber NCF fabrics. The flame-retardant laminate contained 50% by volume of continuous glass fiber and 50% by volume of flame-retardant epoxy.

Example 3

Using 4 sheets of glass continuous fiber NCF fabric and 3 sheets of aluminum metal mesh with an opening of 10 µm, a 3.2 mm thick flame-retardant laminate was manufactured, and then a silver (Ag) layer was formed to a thickness of 20 nm through spray coating. A composite material for a pack case was obtained.

Between the glass continuous fiber NCF fabrics, three aluminum metal meshes with an opening of 10 µm were laminated. The flame-retardant laminate contained 50% by volume of continuous glass fiber and 50% by volume of flame-retardant epoxy.

Example 4

A 3.2 mm thick flame-retardant laminate was prepared using four glass continuous fiber NCF fabrics, and then a silver (Ag) layer was formed to a thickness of 200 nm through spray coating to obtain a composite material for a battery pack case.

One sheet of aluminum metal mesh having an opening of 10 μm was laminated between the glass continuous fiber NCF fabrics. The flame-retardant laminate made of 4 continuous glass fiber NCF fabrics is composed of 50% by volume continuous glass fiber and 50% by volume flame-retardant epoxy.

Comparative Example 1

A 3.2 mm thick flame-retardant laminate was prepared using four glass continuous fiber NCF fabrics, and then a silver (Ag) layer was formed to a thickness of 20 nm through spray coating to obtain a composite material for a battery pack case.

The flame-retardant laminate made of 4 continuous glass fiber NCF fabrics is composed of 50% by volume continuous glass fiber and 50% by volume flame-retardant epoxy.

Comparative Example 2

A 3.2 mm thick flame-retardant laminate was prepared using four glass continuous fiber NCF fabrics, and then a silver (Ag) layer was formed to a thickness of 200 nm through spray coating to obtain a composite material for a battery pack case.

The flame-retardant laminate made of 4 continuous glass fiber NCF fabrics is composed of 50% by volume continuous glass fiber and 50% by volume flame retardant epoxy.

Experimental Example 1

The electromagnetic wave shielding performance of the materials of Examples 1 to 4 and the materials of Comparative Examples 1 to 2 was evaluated. Table 1 summarizes the electromagnetic shielding results.

Shielding Effectiveness (dB) Example 1 40~45 Example 2 30~35 Example 3 85 or more Example 4 85 or more Comparative Example 1 20-25 Comparative Example 2 60~65

Although the embodiments have been described with reference to the accompanying drawings, the invention is not limited to the above embodiments, but may be manufactured in various different forms by combining the contents disclosed in each embodiment. Those skilled in the art will understand that the invention can be implemented in other specific forms without changing the technical idea or essential features. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects.

1,2: continuous fiber
P: flame retardant resin substrate
10, WF, NCF, UD, FP: flame retardant layer
20: metal layer
100, 101, 102: composite material for battery pack case
M, M1, M2, Me1, Me2: metal mesh

Claims (10)

A flame-retardant layer comprising a laminate including fibrous layers including continuous fibers oriented in-plane and at least one metal mesh disposed between the fibrous layers, and a flame-retardant resin substrate impregnated in the laminate; And
Including; a metal layer having a thickness of 20 nm to 100 μm and disposed on the flame retardant layer,
The fiber layers are laminated in the thickness direction of the flame retardant layer so that the oriented surfaces of the continuous fibers face each other,
The opening of the at least one metal mesh is 1 μm to 100 μm,
The metal layer is directly bonded on the flame retardant layer
Composite material for battery pack case. The method of claim 1,
The fiber layers are each of the continuous fibers oriented in one direction
Composite material for battery pack case. The method of claim 1,
The fibrous layers include a first layer and a second layer disposed on the first layer,
In the first layer, the continuous fibers are oriented in one direction in a first direction,
In the second layer, the continuous fibers are oriented in one direction in a second direction,
The first direction and the second direction are crossed
Composite material for battery pack case. The method of claim 1,
Each of the fiber layers is a woven fabric fabric layer in which the continuous fibers are woven
Composite material for battery pack case. The method of claim 1,
Each of the fiber layers is a non-crimp reinforcing fiber (NCF) fabric layer of continuous fibers of the continuous fibers.
Composite material for battery pack case. The method of claim 1,
The metal layer is formed by a metal deposition method or a metal coating method.
Composite material for battery pack case. delete delete The method of claim 1,
The continuous fibers are composed of glass fiber and/or carbon fiber
Composite material for battery pack case. The method of claim 1,
The flame retardant layer has a fraction of the continuous fibers of 35 vol% to 60 vol%
Composite material for battery pack case.

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