KR20190020370A - Molded product, battery pack housing including the same, and battery pack for drone - Google Patents

Abstract

The present invention relates to a molded product, a battery pack housing comprising the same, and a battery pack for a drone. The molded product comprises a flame-retardant outer cover and a composite sheet inserted into the flame-retardant outer cover. The flame-retardant outer cover includes a flame-retardant resin. The composite sheet includes: flame-retardant layers containing the flame-retardant resin; and a non-flame-retardant layer containing a non-flame-retardant resin. In addition, the non-flame-retardant layer is disposed between the flame-retardant layers and includes a continuous fiber reinforcement.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a molded product, a battery pack housing including the same, and a battery pack for a drone,

The present invention relates to a molded article, a battery pack housing including the molded article, and a battery pack for a drone.

The battery pack is an energy storage device in which a battery cell, a BMS (Battery Mangement System), and an LED device are housed in a storage space in the battery pack housing. The battery pack housing is a box-shaped outer case that accommodates the battery cell, the BMS (Battery Mangement System), the LED device, and the like. For example, the battery pack housing for a drone can be manufactured using synthetic resin such as polycarbonate (PC), polycarbonate / acrylonitrile butadiene styrene (PC / ABS), paper, and the like. The battery pack housing for a drone is required to have high strength and high rigidity so as to be able to withstand external impacts,

The invention seeks to provide a lightweight battery pack housing having high strength and high rigidity against external impact.

An object of the present invention is to provide a battery pack for a drone in which a battery cell is housed in a lightweight battery pack housing having high strength and high rigidity against an external impact.

An object of the present invention is to provide a molded article for use in a light weight battery pack housing having high strength and high rigidity against an external impact.

The invention seeks to provide a lightweight battery pack housing with flame retardant properties.

An object of the present invention is to provide a battery pack for a drone in which a battery cell is embedded in a lightweight battery pack housing having flame retardant characteristics.

The invention seeks to provide a molded article for use in a lightweight battery pack housing having flame retardant properties.

The problems to be solved by the invention are not limited to those mentioned above, and the problems which are not mentioned can be clearly understood by those skilled in the art from the following description.

The molded article includes a flame-retardant outer cover and a composite sheet inserted into the flame-retardant outer cover. The flame retardant outer cover includes a flame retardant resin. The composite sheet includes a flame retardant layer containing the flame retardant resin and a non-flame retardant layer containing a non-flame retardant resin. The non-burned-down layer is disposed between the flame-retardant layers. The non-burned-down layer includes a continuous fiber reinforcement.

The flame-retardant outer cover may include a first bending portion. The flame-retardant outer cover may include the first bending portion, and the composite sheet may include a second bending portion corresponding to the first bending portion.

The flame-retardant outer cover may include a first surface and a second surface extending from the first surface in a bent state with respect to the first surface.

The flame-retardant outer cover may include a first surface and a second surface extending from the first surface in a bent state with respect to the first surface, wherein the second surface has a thicker thickness than the first surface .

The flame-retardant outer cover may include a first surface and a second surface extending from the first surface in a bent state with respect to the first surface, wherein the second surface has a thicker thickness than the first surface And the composite sheet may be inserted only in the first surface and the second surface.

The retardation sheet may be the same kind of synthetic resin.

For example, the flame retardant outer cover may be composed of a polyethylene terephthalate (PET) resin, the flame retardant layers may be composed of the PET resin, and the non-burned soft layer may be composed of polypropylene and glass continuous fibers .

For example, the flame retardant outer cover may be composed of a polyamide (PA) resin, the flame retardant layers may be composed of the PA resin, and the non-burned soft layer may be composed of polypropylene and glass continuous fibers.

The flame retardant outer cover may further include at least one of a short fiber reinforcing material and a long fiber reinforcing material.

The flame-retardant outer cover may further include at least one of glass short fibers and glass long fibers in an amount of 20 wt% or more and 30 wt% or less with respect to the total weight of the flame-retardant outer cover.

The continuous fiber reinforcement may be a glass continuous fiber. The continuous fiber reinforcement may be the glass continuous fiber, and the continuous glass fiber may be contained in an amount of 30 wt% or more and 60 wt% or less with respect to the total weight of the non-burned soft layer.

The continuous fiber reinforcement may be carbon continuous fiber. The continuous fiber reinforcement may be the carbon continuous fiber, and the carbon continuous fiber may be contained in an amount of 10 wt% or more and 20 wt% or less with respect to the total weight of the non-burned soft layer.

The flame-retardant outer cover may further include at least one through-hole and at least one metal post inserted in the at least one through-hole.

The battery pack housing is obtained by joining the molded products together. The battery pack housing includes a first flame-retardant outer cover, a second flame-retardant outer cover coupled with the first flame-retardant outer cover, and a second flame- And a composite sheet disposed between at least one of the first flame-retardant outer cover and the second flame-retardant outer cover and the storage space.

The composite sheet is inserted into at least one of the first flame-retardant outer cover and the second flame-retardant outer cover.

The first flame-retardant outer cover includes a flame retardant resin. The second flame retardant outer cover includes the flame retardant resin.

The composite sheet includes a flame retardant layer containing the flame retardant resin and a non-flame retardant layer containing a non-flame retardant resin. The non-burned-down layer is disposed between the flame-retardant layers. The non-burned-down layer includes a continuous fiber reinforcement. The battery pack housing may be a battery pack housing for a drone.

The battery pack for a drone includes the battery pack housing and a battery cell mounted in the storage space.

The details of other embodiments are included in the detailed description and drawings.

The invention can provide a lightweight battery pack housing having high strength and high rigidity against an external impact. Conventional battery packs have a metal frame attached to the battery cells to compensate for the low strength and low rigidity of the battery pack housing. The use of a metal frame not only increased the number of assembly steps of the battery pack, but also increased the weight of the battery pack.

Since the battery pack housing according to the present invention has a sufficiently high strength and rigidity in itself, it is unnecessary or minimized to attach a metal frame to the battery cell.

Therefore, the battery pack housing according to the invention makes it possible to reduce the weight of the battery pack and improve the productivity of the battery pack.

Since the battery pack housing for the drone protects the devices supplying power to the drone, it must not only have high strength and high rigidity but also should not be damaged in the event of a collision in order to protect the power supply devices in the event of a drone crash.

The battery pack housing according to the present invention is suitable for a battery pack housing for a drone, because it has a high strength and a high rigidity enough to enable the weight of the battery pack to be reduced and to protect the power supply devices at the time of the drop of the drone.

On the other hand, there is a case where the battery is excessively operated, or when the battery collides or falls, the battery may explode. Existing battery pack housings were burned in the event of a fire, which could send fire to other parts of the dron, which could destroy the entire parts of the drones due to fire.

Since the battery pack housing according to the present invention includes the flame retardant material, unlike the conventional battery pack housing, it is possible to prevent the fire from being transmitted to other parts of the dron when the battery explodes in the event of malfunction, collision or fall of the battery. ≪ / RTI >

The invention can provide a lightweight battery pack having high strength and high rigidity against external impact and having flame retardant properties. The battery pack according to the present invention is advantageous to a battery pack for a drone.

The invention can provide a molded article for use in a lightweight battery pack housing having high strength and high rigidity against external impact and having flame retardant properties.

The effects according to the invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a schematic exploded perspective view of a battery pack housing according to an embodiment.
2 is a schematic perspective view of a composite sheet according to an embodiment.
3 is a schematic cross-sectional view of the battery pack housing according to the line AA of FIG.
4 is a schematic cross-sectional view of a battery pack housing according to another embodiment.
5 is a schematic cross-sectional view of a battery pack housing according to another embodiment.
6 is a schematic cross-sectional view of a battery pack housing according to another embodiment.
7 is a schematic cross-sectional view of a battery pack housing according to another embodiment.
8 is a view showing a manufacturing process of a molded product according to an embodiment.
9 is a manufacturing process diagram of a molded product according to another embodiment.
Figs. 10 to 13 schematically show a part of the manufacturing process of Fig. 9.
14 is a schematic perspective view of a molded product constituting a battery pack housing according to still another embodiment.
15 is a schematic sectional view taken along the line BB 'in Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In addition, the invention is not limited to the contents disclosed below, but may be implemented in various forms, and the contents disclosed in the following description are intended to be illustrative of the invention, and it is to be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. And the invention is only defined by the scope of the claims.

A detailed description of the related art may be omitted if it is determined that the technical gist of the present invention may be blurred.

Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of layers and regions in the figures may be exaggerated for clarity of illustration.

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

Throughout the specification, each element may be singular or plural, unless specifically stated otherwise.

It is to be understood that throughout the specification, when an element is referred to as being "having", "having", or "having" an element, it should be understood that this does not exclude other elements, It can be included.

In the specification, "A and / or B" means A, B, or A and B unless otherwise indicated, and "C to D" C means more than C and D or less.

It is to be understood that when an element or layer is referred to as being "on" or " on "of another element or layer, All included. On the other hand, a device being referred to as "directly on" or "directly above " indicates that no other device or layer is interposed in between.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" May be used to readily describe a device or a relationship of components to other devices or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is a schematic exploded perspective view of a battery pack housing 100 according to an embodiment.

Referring to FIG. 1, a battery pack housing 100 is obtained by joining molded products having a predetermined shape, and has a storage space for accommodating parts therein. For example, the first molded product M1 includes a first flame-retardant outer cover 10 and a second flame-retardant outer cover 10 disposed directly on one side of the first flame-retardant outer cover 10, And a first composite sheet S1. As will be described later, each molded article is the result of insert injection molding, and the first composite sheet S1 is inserted into the first flame-retardant outer cover 10.

The battery pack housing 100 includes a first flame-retardant outer cover 10, a second flame-retardant outer cover 20, a first composite sheet S1, and a second composite sheet (not shown). The first composite sheet S1 is inserted into the first flame-retardant outer cover 10. The second composite sheet (not shown) is inserted into the second flame-retardant outer cover 20.

The first flame-retardant outer cover 10 includes a body 11 and a handle 12 extending from the body 11, for example, as shown in Fig. 1, although the shape thereof is not particularly limited. And a predetermined space 13 can be provided between the handle 12 and the body 11 so that the user can grasp the handle 12. [

The body 11 may include a first surface 11a and a second surface 11b extending from the first surface 11a while being bent with respect to the first surface 11a. The first surface 11a is connected to the second surface 11b through the first bending portion BP1 and the first surface 11a is concave and convex on the basis of the rim surface TD1 of the second surface 11b And may be formed as a groove portion.

The second flame retardant outer cover 20 may be configured to include the body 21 and the handle 22 extending from the body 21 and the handle 22 A predetermined space 23 can be provided between the body 21 and the body 21 so that the user can grasp the handle 22. [

The body 21 may include a first surface 21a and a second surface 21b extending from the first surface 21a while being bent with respect to the first surface 21a. The first surface 21a is connected to the second surface 21b through the first bending portion BP1 and the first surface 21a is concave and convex on the basis of the rim surface TD2 of the second surface 21b And may be formed as a groove portion.

The first flame-retardant outer cover 10 and the second flame-retardant outer cover 20 may be arranged in mirror-symmetry to be coupled to each other. The first flame retardant outer cover 10 and the second flame retardant outer cover 20 have second faces 11b and 21b which extend from the first faces 11a and 21a and are bent with respect to the first faces 11a and 21a, When the first flame-retardant outer cover 10 and the second flame-retardant outer cover 20 are coupled to each other, more specifically, when the rim surface TD1 of the first flame- A predetermined space may be formed between the first flame-retardant outer cover 10 and the second flame-retardant outer cover 20 when the rim surface TD2 of the flame-retardant outer cover 20 is coupled to each other.

In other words, a predetermined storage space may be formed inside the battery pack housing 100. Various components such as a battery cell (not shown), a BMS (not shown), an LED, and the like can be housed in the storage space.

In the battery pack housing 100, the first composite sheet S1 can be disposed between the first flame retardant outer cover 10 and the storage space. In the battery pack housing 100, a second composite sheet (not shown) may be disposed between the second flame retardant outer cover 20 and the storage space.

According to the illustrated example, the shape of the body 11 of the first flame-retardant outer cover 10 can be formed in a substantially "C" shape. However, the shape of the body 11 of the first flame-retardant outer cover 10 may vary depending on the shape of the mold of the insert injection molding machine. The shape of the body 21 of the second flame-retardant outer cover 20 may also be formed in a substantially "C" shape according to the illustrated example, but is not limited thereto.

2 is a schematic perspective view of the composite sheet S1 according to one embodiment.

Referring to FIGS. 1 and 2, the first composite sheet S1 may include a second bending portion BP2 corresponding to the first bending portion BP1 of the first flame-retardant cover 10. Specifically, the first composite sheet S1 may be configured to include a flat plate body FB and bending planes LB and RB extending from the flat plate body FB and curved with respect to the flat plate body FB. The flat plate body FB corresponds to the first surface 11a of the first flame retardant outer cover 10 and the bending surfaces LB and RB correspond to the second surface 11b of the first flame retardant outer cover 10, Respectively. In other words, the flat plate body FB is disposed to face the first side 11a of the first flame-retardant cover 10, and the bending planes LB and RB are disposed on the second side of the first flame- And faces the surface 11b.

According to the illustrated example, the first composite sheet S1 can be made in a "C" shape. However, the shape of the first composite sheet S1 may vary depending on the shape of the mold of the insert injection molding machine. The description of the second composite sheet (not shown) is the same as that of the first composite sheet S1 described above, and thus will not be described.

The first flame-retardant outer cover 10 includes a flame retardant resin. The retarding paper may be a synthetic resin having flame retardant properties, and known paper can be used. Examples of the flame retardant resin include flame retardant thermoplastic resin, flame retardant polyolefin (PO), flame retardant polyethylene (PE), flame retardant polypropylene (PP), flame retardant polyisobutylene, at least one of polyethylene terephthalate (PET), non-burned polycarbonate (PC), and flame-retardant polyamide (PA) may be used.

The retardation retardation is prepared by using a known flame retardant, and may be a halogen-based flame retardant resin or a non-halogen-based flame retardant resin or a combination thereof. From the viewpoint of harmfulness and environmental friendliness, non-halogen flame retardant resins can be used, and examples of non-halogen flame retardant resins include phosphorus-based flame retardant resins.

The first flame retardant outer cover 10 may include at least one of a flame retardant resin, a short fiber reinforcement and a long fiber reinforcement. The short fiber reinforcing material or the long fiber reinforcing material may be glass short fiber, glass long fiber, carbon short fiber, carbon fiber, or the like. For example, the first flame-retardant outer cover 10 may contain at least one of glass short fibers and glass long fibers in an amount of 20 wt% or more and 30 wt% or less with respect to the total weight of the first flame- And may be included within the range.

The first flame retardant outer cover 10 may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. The first flame-retardant outer cover 10 may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less. The first flame retardant outer cover 10 may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. For example, the flame retardant PET resin outer cover may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less. For example, the flame retardant PET resin outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. For example, the flame-retardant PA resin outer cover may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less. For example, the flame retardant PET resin outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. For example, the flame retardant PC resin outer cover may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less. For example, the flame retardant PC resin outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less.

The first flame-retardant cover 10 may have substantially the same thickness within the thickness range of the first surface 11a and the second surface 11b. Substantially the same thickness means that the thickness is the same within an error range of 5%.

The second flame-retardant outer cover 20 includes a flame retardant resin. The retarding paper may be a synthetic resin having flame retardant properties, and known paper can be used. Examples of the flame retardant resin include flame retardant thermoplastic resin, flame retardant polyolefin (PO), flame retardant polyethylene (PE), flame retardant polypropylene (PP), flame retardant polyisobutylene, at least one of polyethylene terephthalate (PET), non-burned polycarbonate (PC), and flame-retardant polyamide (PA) may be used.

The retardation retardation is prepared by using a known flame retardant, and may be a halogen-based flame retardant resin or a non-halogen-based flame retardant resin or a combination thereof. From the viewpoint of harmfulness and environmental friendliness, non-halogen flame retardant resins can be used, and examples of non-halogen flame retardant resins include phosphorus-based flame retardant resins.

The second flame-retardant outer cover 20 may include at least one of a flame retardant resin, a short-fiber reinforcement and a long-fiber reinforcement. The short fiber reinforcing material or the long fiber reinforcing material may be glass short fiber, glass long fiber, carbon short fiber, carbon fiber, or the like. For example, the second flame-retardant outer cover 20 may contain at least one of glass short fibers and glass long fibers in an amount of 20 wt% or more and 30 wt% or less with respect to the total weight of the second flame- And may be included within the range.

The second flame-retardant outer cover 20 may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. The second flame-retardant outer cover 20 may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less. The second flame-retardant outer cover 20 may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less.

For example, the flame retardant PET resin outer cover may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less. For example, the flame retardant PET resin outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. For example, the flame-retardant PA resin outer cover may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less. For example, the flame retardant PET resin outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. For example, the flame retardant PC resin outer cover may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less. For example, the flame retardant PC resin outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less.

The second flame-retardant cover 20 may have substantially the same thickness of the first surface 21a and the second surface 21b within the thickness range described above. Substantially the same thickness means that the thickness is the same within an error range of 5%.

3 is a schematic cross-sectional view of the battery pack housing 100 taken along line A-A of FIG.

Referring to Fig. 3, the first composite sheet S1 includes a flame-retardant layer 1 and a non-burned-soft layer 2. The non-burned soft layer 2 may be disposed between the flame-retardant layer 1. The first composite sheet S1 can exhibit both the flame retardant property, the high rigidity property and the high strength property.

The flame-retardant layers 1 include a flame retardant resin. The flame-retardant layers 1 may serve to impart flame retardancy to the first composite sheet S1. The flame-retardant layers 1 may or may not include reinforcing fibers. The reinforcing fiber can be short glass fiber, glass long fiber, carbon short fiber, carbon fiber, glass continuous fiber, carbon continuous fiber and the like.

A flame retardant thermoplastic resin, a polyolefin (PO), a flame retardant polyethylene (PE), a polypropylene (PP), a flame retardant polypropylene (PP) , At least one of flame retardant polyisobutylene, polyethylene terephthalate (PET), polycarbonate (PC), and flame retardant polyamide (PA) may be used.

The retardation retardation is prepared by using a known flame retardant, and may be a halogen-based flame retardant resin or a non-halogen-based flame retardant resin or a combination thereof. From the viewpoint of harmfulness and environmental friendliness, non-halogen flame retardant resins can be used, and examples of non-halogen flame retardant resins include phosphorus-based flame retardant resins.

The flame-retardant layers 1 may have a predetermined thickness in the range of 0.5 mm or more and 3.0 mm or less. The flame-retardant layers 1 may have a predetermined thickness in the range of 0.5 mm or more and 1.5 mm or less. The flame-retardant layers 1 may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less.

For example, the flame-retardant PET resin layer may have a predetermined thickness in the range of 0.5 mm or more and 1.5 mm or less. For example, the flame-retardant PET resin layer may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. For example, the flame-retardant PA resin layer may have a predetermined thickness in the range of 0.5 mm or more and 1.5 mm or less. For example, the flame-retardant PA resin layer may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less. For example, the flame retardant PC resin layer may have a predetermined thickness in the range of 0.5 mm or more and 1.5 mm or less. For example, the flame-retardant PC resin layer may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less.

The non-burned soft layer (2) includes a non-burned soft resin and a continuous fiber reinforcement. The non-burned soft layer 2 is intended to impart high strength, high strength and light weight to the first composite sheet S1, and a continuous fiber thermoplastic (CFT), which is a lightweight material having high strength and high rigidity, have. Examples of continuous fiber-reinforced thermoplastic plastics include polypropylene and glass fibers. Other examples of continuous fiber-reinforced thermoplastic plastics include those containing polyamide and glass fiber.

The non-burned resin is a general synthetic resin to which no flame retardant property is imparted. Examples of the non-burned resin include thermoplastic resin, polyethylene (PE), polypropylene (PP), polyisobutylene, polyethylene phthalate at least one of polyethylene terephthalate (PET), polycarbonate (PC), and polyamide (PA).

The continuous fiber reinforcement can be used without limitation as long as it is known, and can be, for example, glass continuous fiber, carbon continuous fiber and the like.

For example, when continuous glass fiber is used as the continuous fiber reinforcement, the continuous glass fiber can be blended in the non-burned soft layer 2 in a content of 30 wt% or more and 60 wt% or less with respect to the total weight of the non-burned soft layer 2, Lt; / RTI > When continuous glass fiber is used as the continuous fiber reinforcing material, the continuous glass fiber is made to have a weight of not less than 30 wt% and not more than 60 wt% with respect to the total weight of the non-burned soft layer 2, It is possible to exhibit excellent durability.

Further, for example, when continuous carbon fiber is used as the continuous fiber reinforcing material, the carbon continuous fiber can be used in the non-burned soft layer (2) in a content of 10 wt% or more and 20 wt% 2). When the carbon fiber continuous fiber is used as the continuous fiber reinforcing material, the carbon fiber continuous fiber is lighter than the battery pack housing in the content of 10 wt% or more and 20 wt% or less with respect to the total weight of the non-burned soft layer 2, It is possible to exhibit excellent durability.

The non-burned soft layer 2 may have a predetermined thickness in the range of 0.5 mm or more and 3.0 mm or less. The non-burned soft layer 2 may have a predetermined thickness in the range of 0.9 mm or more and 2.4 mm or less. The non-burned soft layer 2 may have a predetermined thickness in the range of 1.8 mm or more and 3.0 mm or less.

For example, the non-burned glass fiber-reinforced PP resin layer has a thickness of 0.9 mm or more and a thickness of 2.4 mm or less. For example, the unfired glass fiber-reinforced PP resin layer may have a predetermined thickness in the range of 1.8 mm or more and 3.0 mm or less.

For example, the unfired glass fiber-reinforced PA resin layer may have a predetermined thickness in the range of 0.9 mm or more and 2.4 mm or less. For example, the non-burned glass fiber reinforced PA resin layer may have a predetermined thickness in the range of 1.8 mm or more and 3.0 mm or less.

The description of the second composite sheet S1 is the same as the description of the first composite sheet S1, and therefore will not be described.

The battery pack housing 100 is of the same type as the synthetic resin used for the flame-retardant layers 1, and for example, a flame-retardant polyethylene terephthalate resin may be used for the flame-retardant layers 1. As another example, a flame retardant polyamide resin may be used for the flame-retardant layers 1. As another example, a flame-retardant polycarbonate resin may be used for the flame-retardant layers 1.

The battery pack housing 100 is made of the same material as that of the first flame retardant outer cover 10 and the synthetic resin used for the flame retardant layers 1. For example, the first flame retardant outer cover 10 of the flame retardant layers 1, And the synthetic resin used for the first flame-retardant outer cover 10 may be of the same type. The same kind of synthetic resin is used for the first flame retardant outer cover 10 and the flame retardant layer 1 disposed adjacent thereto to improve the interfacial bonding strength between the first composite sheet S1 and the first flame retardant outer cover 10 .

For example, the synthetic resin used for the first flame-retardant outer cover 10 and the flame-retardant layers 1 may be flame-retardant polyethylene terephthalate. As another example, the synthetic resin used for the first flame retardant outer cover 10 and the flame retardant layers 1 may be a flame retardant polyamide. As another example, the synthetic resin used for the first flame retardant outer cover 10 and the flame retardant layers 1 may be a flame retardant polycarbonate.

In a specific example, a flame retardant polyethylene terephthalate resin may be used for the flame retardant layers 1, a flame retardant polyethylene terephthalate resin may be used for the first flame retardant outer cover 10, May be used.

For example, the flame-retardant PET resin layers may have a predetermined thickness in the range of 0.5 mm or more and 1.5 mm or less, and the flame-retardant PET outer cover may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less, The unfired glass fiber-reinforced PP resin layer has a thickness of 0.9 mm or more and a thickness of 2.4 mm or less.

In the specific example, a flame retardant polyamide (PA) resin may be used for the flame retarding layers 1, a flame retardant polyamide resin may be used for the first flame retardant outer cover 10, Fiber-reinforced polyamide resin may be used.

For example, the flame retardant PA resin layers may have a predetermined thickness in the range of 0.5 mm or more and 1.5 mm or less, the flame retardant PA outer cover may have a predetermined thickness in the range of 1.0 mm or more and 2.5 mm or less, The non-burned glass fiber reinforced PA resin layer has a thickness of 0.9 mm or more and a thickness of 2.4 mm or less.

In the specific example, a flame retardant polycarbonate (PC) resin may be used for the flame retardant layers 1, a flame retardant polycarbonate resin may be used for the first flame retardant outer cover 10, Fiber reinforced polypropylene (PP) resin may be used.

For example, the flame retardant PC resin layers may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less, and the flame retardant PC outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less, The unfired glass fiber reinforced PP resin layer may have a predetermined thickness in the range of 1.8 mm or more and 3.0 mm or less.

4 is a schematic cross-sectional view of a battery pack housing 101 according to another embodiment. Hereinafter, only differences between the battery pack housing 101 and the battery pack housing 100 will be described in detail, and the detailed description of the components and structures will be omitted.

Referring to Figs. 3 and 4, the battery pack housing 101 includes a first composite sheet S1-1. The first-first composite sheet S1-1 includes a non-burned soft layer 2 disposed between the flame-retardant layers 3 and the flame-retardant layers 3.

The battery pack housing 101 differs from the battery pack housing 100 in that the flame retardant layers 3 and the synthetic resin used for the first flame-retardant outer cover 10 are different from each other. For example, a flame retardant polycarbonate resin may be used for the flame retarding layers 3, and a flame retardant polyethylene terephthalate (PET) resin may be used for the first flame retardant outer cover 10. As another example, a flame retardant polyethyleneterephthalate resin may be used for the flame retarding layers 3, and a flame retardant polycarbonate (PC) resin may be used for the first flame retardant outer cover 10. As another example, a flame retardant polyamide (PA) resin may be used for the flame retarding layers 3, and a flame retardant polyethylene terephthalate resin may be used for the first flame retardant outer cover 10.

In the specific example, a flame retardant polyethylene terephthalate resin may be used for the flame retarding layers 3, a flame retardant polycarbonate resin may be used for the first flame retardant outer cover 10, A reinforced polypropylene resin can be used.

For example, the flame retardant PET resin layers may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less, and the flame retardant PC outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less, The unfired glass fiber reinforced PP resin layer may have a predetermined thickness in the range of 1.8 mm or more and 3.0 mm or less.

In the specific example, a flame retardant polyamide resin may be used for the flame retarding layers 3, a flame retardant polyethylene terephthalate resin may be used for the first flame retardant outer cover 10, Reinforced polyamide resins can be used.

For example, the flame-retardant PA resin layers may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less, and the flame-retardant PET outer cover may have a predetermined thickness in the range of 1.5 mm or more and 3.0 mm or less, The non-burned glass fiber reinforced PA resin layer may have a predetermined thickness in the range of 1.8 mm or more and 3.0 mm or less.

5 is a schematic cross-sectional view of a battery pack housing 102 according to another embodiment. Hereinafter, only the difference between the battery pack housing 102 and the battery pack housing 100 will be described in detail, and the same components and the same structure have been described in detail before, and a detailed description thereof will be omitted. .

Referring to Figs. 3 and 5, the battery pack housing 102 includes a 1-2 composite sheet S1-2. The first-second composite sheet S1-2 is a composite sheet in which the synthetic resin used for the flame-retardant layer 1 disposed on the non-burned-up layer 2 and the flame- But differs from the first composite sheet S1 in the different points.

For example, a flame retardant poly (ethylene terephthalate) (PET) resin may be used for the flame retardant layer 1, and a flame retardant polyamide resin may be used for the flame retardant layer 4. As another example, a flame retardant polyamide (PA) resin may be used for the flame retardant layer 1, and a flame retardant polyethylene terephthalate resin may be used for the flame retardant layer 4. As another example, a flame retardant polycarbonate (PC) resin may be used for the flame retardant layer 1, and a flame retardant polyamide resin may be used for the flame retardant layer 4. As another example, a flame retardant poly (ethylene terephthalate) resin may be used for the flame retardant layer 1, and a flame retardant polycarbonate resin may be used for the flame retardant layer 4.

In a specific example, a flame retardant polyethyleneterephthalate resin may be used for the flame retardant layer 1, a flame retardant polyamide resin may be used for the flame retardant layer 4, and a flame retardant polyethylene terephthalate Resin can be used, and as the non-burned soft layer 2, a polypropylene resin reinforced with glass fiber can be used.

In a specific example, a flame retardant polyamide resin may be used for the flame retardant layer 1, a flame retardant polyethylene terephthalate resin may be used for the flame retardant layer 4, and a flame retardant polyamide resin May be used, and as the non-burned soft layer 2, a glass fiber reinforced polyamide resin may be used.

In the specific example, a flame retardant polycarbonate resin may be used for the flame retardant layers 1, a flame retardant polyamide resin may be used for the flame retardant layer 4, and a flame retardant polycarbonate resin May be used. As the non-burned soft layer 2, a polypropylene resin reinforced with glass fiber may be used.

6 is a schematic cross-sectional view of a battery pack housing 103 according to another embodiment. Hereinafter, only the difference between the battery pack housing 103 and the battery pack housing 101 will be described in detail, and the same components and the same structure have been described in detail in the foregoing, and a detailed description thereof will be omitted. .

Referring to Figs. 4 and 6, the battery pack housing 103 includes a 1-3 composite sheet S1-3. The first-third composite sheet S1-3 is a composite sheet in which the flame-retardant layer 3 disposed on the non-burned-soft layer 2 and the synthetic resin used in the flame retardant layer 4 disposed on the underside of the non- And is different from the first-first composite sheet S1-1 in the difference.

For example, a flame retardant poly (ethylene terephthalate) resin may be used for the flame retardant layer 3, and a flame retardant polyamide resin may be used for the flame retardant layer 4. As another example, a flame retardant polyamide resin may be used for the flame retardant layer 3, and a flame retardant polyethylene terephthalate resin may be used for the flame retardant layer 4. As another example, a flame retardant polycarbonate resin may be used for the flame retardant layer 3, and a flame retardant polyamide resin may be used for the flame retardant layer 4. As another example, a flame retardant poly (ethylene terephthalate) resin may be used for the flame retardant layer 3, and a flame retardant polycarbonate resin may be used for the flame retardant layer 4.

In a specific example, a flame retardant polyethyleneterephthalate resin may be used for the flame retardant layer 3, a flame retardant polyamide resin may be used for the flame retardant layer 4, and a flame retardant polycarbonate resin May be used. As the non-burned soft layer 2, a polypropylene resin reinforced with glass fiber may be used.

In the specific example, a flame retardant polyamide resin may be used for the flame retardant layer 3, a flame retardant polycarbonate resin may be used for the flame retardant layer 4, and a flame retardant polyethylene terephthalate resin May be used, and as the non-burned soft layer 2, a glass fiber reinforced polyamide resin may be used.

7 is a schematic cross-sectional view of a battery pack housing 104 according to another embodiment. Hereinafter, only the difference between the battery pack housing 104 and the battery pack housing 100 will be described in detail, and the same components and the same structure have been described in detail before, and a detailed description thereof will be omitted. .

3 and 7, the battery pack housing 104 includes the metal pillars 30 inserted into the through holes H and the metal pillars 30 inserted into the through holes H, There is a difference. Since the first outer cover 10 and the first composite sheet S1 of the battery pack housing 100 are made of a synthetic resin having low thermal conductivity, the battery pack housing 100 is limited in terms of heat dissipation.

The battery pack housing 104 includes through holes H each of which passes through the first outer cover 10 and the first composite sheet S1, The heat dissipation of the battery pack housing 100 can be improved by inserting the battery pack 30 into the battery pack housing 100.

Fig. 8 is a manufacturing process diagram of a molded product (see M1 in Fig. 1) according to one embodiment.

Referring to Fig. 8, a method of manufacturing a molded article according to an embodiment includes the following steps P1 to P3. According to the method for producing a molded article according to one embodiment, an insert injection molded article in which the composite sheet and the flame retardant resin composition are molded into a predetermined shape and integrated can be obtained. The insert insert obtained at this time corresponds to a molded product constituting the battery pack housing, and the battery pack housing and the molded product have been described in detail in detail above, and thus the detailed description will be omitted.

Step P1: Preparing a flat sheet-like composite sheet having a laminated structure in which a non-burned soft layer is disposed between the flame-retardant layers

Step P2: Preheating the composite sheet of flat plate shape

Step P3: A preheated flat sheet-like composite sheet is placed in a mold, and a flame retardant resin composition is injected to insert injection molding

9 is a manufacturing process diagram of a molded product according to another embodiment. Referring to Fig. 9, the method of manufacturing a molded article according to another embodiment includes the following P1 step, P4 step, P2-1 step, and P3-1 step. The manufacturing process of FIG. 9 differs from the manufacturing process of FIG. 8 in that the flat sheet-like composite sheet is preformed into a predetermined shape through the P4 process.

Step P1: Preparing a flat sheet-like composite sheet having a laminated structure in which a non-burned soft layer is disposed between the flame-retardant layers

Step P4: Preforming a flat sheet-like composite sheet according to the mold shape of the injection molding machine

P2-1 process: preheating preformed composite sheet

P3-1 Process: Preheating preformed composite sheet is placed in a mold, and a flame retardant resin composition is injected to insert injection molding

Figs. 10 to 13 schematically show P1 to P4 steps of the manufacturing process of Fig. 9.

First, the P1 process of FIG. 9 will be described in detail with reference to FIGS. 10 to 12. FIG.

After the first flame retardant resin sheet 1 and the second flame retardant resin sheet 1 and the non-burnable resin sheet 2 are prepared respectively and then the non-burned resin sheet 2 is laminated on the first flame retardant resin sheet 1 And a second flame retardant resin sheet 1 is laminated on top of the non-burnished resin sheet 2 to prepare a laminate in which the non-burned resin sheet 2 is laminated between the flame retardant resin sheets 1.

A laminate in which the non-softened resin sheet 2 is laminated between the flame retardant resin sheets 1 is positioned between the upper press UP and the lower press LP and the upper press UP is moved in the I direction And the lower press LP is moved in the II direction, the sheets are joined together to obtain a flat sheet-like composite sheet (S1 in Fig. 12).

The lapping temperature may be set to the glass transition temperature of the flame retardant resin sheet, for example, when flame retardant polycarbonate is used in the flame retardant resin sheet, the lapping temperature may be 230 캜. Further, for example, when flame retardant polyethylene terephthalate is used as the flame retardant resin sheet, the lamination temperature may be 265 ° C.

On the other hand, the lap pressure can be, for example, 10 bar.

Referring to Figs. 12 and 13, the P4 process in Fig. 9 will be described in detail.

After the flat sheet-like composite sheet (S1 in FIG. 12) is placed in the preforming mold, the upper mold UMB is moved along the I direction and the lower mold LMB is moved along the II direction A composite sheet (S1 in Fig. 13) preliminarily molded into a predetermined shape can be produced.

The upper mold UMB has the protruding portion UMP whose both ends are protruded in the direction toward the lower mold LMB and the protruding portion LMP in which the central portion of the lower mold LMB is protruded in the direction toward the upper mold UMB (S1 in Fig. 12) is bent while the upper and lower dies (UMB, LMB) are engaged with each other to obtain a composite sheet (S1 in Fig. 13) have.

(M1 in Fig. 1) can be obtained by insert injection molding the preformed composite sheet together with the flame retardant resin composition through the P2-1 step and the P-3 step.

The present invention can provide a lightweight battery pack having a high strength and a high rigidity in which a battery cell is housed in a storage space of the battery pack housing (100 in FIG. 1).

The present invention can provide a lightweight battery pack for a drone having a high strength and a high rigidity, in which a battery cell for a drone is housed in a storage space of the battery pack housing (100 in Fig. 1).

According to experiments performed by the inventors, the injection performance alone showed the same level of collision performance as that of the conventional battery pack housing. However, when the insert injection molding is performed together with the above-mentioned flame retardant resin composition using the composite sheet described above, Compared with existing battery pack housings, it shows improved crash performance.

<Experimental Example>

Plates were prepared according to Examples 1 to 5 and Comparative Examples. The test pieces were collided with the respective flat plates, and the degree of damage of the flat plates was measured. The size of each flat plate was 200 mm × 200 mm × 3 mm in width × length × thickness, the diameter of the ball was 80 mm, the weight of the test ball was 10 kg and the velocity of the test ball was 100 km / h .

Example  One

A composite sheet in which a flame retardant polyethylene terephthalate (PET) resin sheet of 0.5 mm, a non-burned glass fiber reinforced plastic resin sheet of 1.5 mm and a flame retardant PET resin sheet of 0.5 mm were arranged in this order was produced. As the glass fiber reinforced plastic resin sheet, 40 wt% of polypropylene and 60 wt% of glass continuous fibers were blended.

The composite sheet was placed in an injection mold, and a flame-retardant PET injection resin was injected to produce a finished product. The specimen was cut so that the width × length × thickness was 200 mm × 200 mm × 3 mm to prepare a flat plate according to Example 1. The flat panel according to Example 1 was made of a laminate in which a flame-retardant PET resin layer of 0.5 mm, a non-burned glass fiber-reinforced plastic resin layer of 1.5 mm, a flame-retardant PET resin layer of 0.5 mm and a flame-retardant PET injection layer of 1.0 mm were arranged in this order.

Example  2

A composite sheet in which a flame retardant polyamide (PA) resin sheet of 0.5 mm, a non-burned glass fiber reinforced plastic resin sheet of 1.5 mm and a flame retardant PA resin sheet of 0.5 mm were arranged in this order was produced. As the non-burned glass fiber reinforced plastic resin sheet, 40 wt% of polyamide and 60 wt% of glass continuous fiber were blended.

The composite sheet was placed in an injection mold, and a flame retardant PA injection resin was injected to produce a finished product. The specimen was cut so that the width × length × thickness was 200 mm × 200 mm × 3 mm, and a flat plate according to Example 2 was produced. The flat panel according to Example 2 was made of a laminate in which a flame retardant PA resin layer of 0.5 mm, a non-burned glass fiber reinforced plastic resin layer of 1.5 mm, a flame retardant PA resin layer of 0.5 mm and a flame retardant PA injection layer of 1.0 mm were arranged in this order.

Example  3

A composite sheet having a flame retardant polycarbonate (PC) resin sheet of 0.5 mm, a non-burned glass fiber reinforced plastic resin sheet of 1.5 mm and a flame retardant PC resin sheet of 0.5 mm was disposed in this order. As the non-burned glass fiber reinforced plastic resin sheet, 60 wt% of glass continuous fiber was blended in 40 wt% of polypropylene.

The composite sheet was placed in an injection mold, and a flame retardant PC injection resin was injected to produce a finished product. The finished product was cut so that the width × length × thickness was 200 mm × 200 mm × 3 mm, and a flat plate according to Example 3 was produced. The flat panel according to Example 3 was made of a laminate having a flame retarded PC resin layer of 1.5 mm, a non-burned glass fiber reinforced plastic resin layer of 1.8 mm, a flame retarded PC resin layer of 1.5 mm and a flame retarded PC injection layer of 1.5 mm.

Example  4

A flame retardant PET resin sheet of 0.5 mm, a non-burned glass fiber reinforced plastic resin sheet of 1.5 mm and a flame retardant PET resin sheet of 0.5 mm were arranged in this order. As the non-burned glass fiber reinforced plastic resin sheet, 60 wt% of glass continuous fiber was blended in 40 wt% of polypropylene.

The composite sheet was placed in an injection mold, and a flame retardant PC injection resin was injected to produce a finished product. The specimen was cut so that the width × length × thickness was 200 mm × 200 mm × 3 mm, and a flat plate according to Example 4 was produced. The flat panel according to Example 4 was made of a laminate in which a flame retardant PET resin layer of 1.5 mm, a non-burned glass fiber reinforced plastic resin layer of 1.8 mm, a flame retardant PET resin layer of 1.5 mm and a flame retardant PC injection layer of 1.5 mm were arranged in this order.

Example  5

A flame-retardant PA resin sheet of 0.5 mm, a non-burned glass fiber-reinforced plastic resin sheet of 1.5 mm and a flame-retardant PA resin sheet of 0.5 mm were arranged in this order. As the non-burned glass fiber reinforced plastic resin sheet, 40 wt% of polyamide and 60 wt% of glass continuous fiber were blended.

The composite sheet was placed in an injection mold, and a flame-retardant PET injection resin was injected to produce a finished product. The specimens were cut so that the width × length × thickness was 200 mm × 200 mm × 3 mm, and a flat plate according to Example 5 was produced. The flat panel according to Example 5 was made of a laminate in which a flame retardant PA resin layer of 1.5 mm, a non-burned glass fiber reinforced plastic resin layer of 1.8 mm, a flame retardant PA resin layer of 1.5 mm and a flame retardant PET injection layer of 1.5 mm were arranged in this order.

Comparative Example

Polycarbonate-ABS (Acrylonitrile-Butadiene-Styrene) resin was injected into an injection mold to prepare an injection molding. The specimens were cut so that the width, length and thickness were 200 mm x 200 mm x 3 mm, and used as a flat plate according to the comparative example.

division rescue Example 1 Flame Retardant PET Sheet 0.5 mm / CFT (PP + GF) 1.5 mm / Flame Retardant PET Sheet 0.5 mm / Flame Retardant PET Injection Material 1.0 mm Laminate Example 2 Flame Retardant PA Sheet 0.5 mm / CFT (PA + GF) 1.5 mm / Flame Retardant PA Sheet 0.5 mm / Flame Retardant PA Injection Material 1.0 mm Laminate Example 3 Flame retardant PC sheet 1.5 mm / CFT (PP + GF) 1.8 mm / Flame retardant PC sheet 1.5 mm / Flame retarded PC injection material 1.5 mm Laminate Example 4 Flame retardant PET sheet 1.5 mm / CFT (PP + GF) 1.8 mm / Flame retardant PET sheet 1.5 mm / Flame retarded PC injection material 1.5 mm Laminate Example 5 Flame Retardant PA Sheet 1.5 mm / CFT (PA + GF) 1.8 mm / Flame Retardant PA Sheet 1.5 mm / Flame Retardant PET Injection Material 1.5 mm Laminate Comparative Example PC-ABS (Polycarbonate-ABS) monolayer structure

Table 2 summarizes the collision test results of the flat plates according to the embodiments and the flat plates according to the comparative example. Referring to Table 2, in Examples 1 and 2, the fracture rate was 0%, and no breakage of the flat plate due to collision of the test specimen was observed.

Examples 3 to 5 exhibited lower impact resistance than those of Examples 1 and 2 at a failure rate of 60% or less, but exhibited improved impact resistance as compared with Comparative Examples.

division Breakage rate Example 1 0 % Example 2 0 % Example 3 60% Example 4 40% Example 5 50% Comparative Example More than 80%

14 is a schematic perspective view of a molded product constituting the battery pack housing 105 according to still another embodiment. 15 is a schematic cross-sectional view taken along the line B-B 'in Fig.

Hereinafter, only the differences between the battery pack housing 105 and the battery pack housing 100 will be described in detail, and the same components and the same structure have been described in detail before, and a detailed description thereof will be omitted. .

1, 2 and 14, the battery pack housing 105 includes a first molded product M1 '. The first molded product M1 'includes a first flame-retardant outer cover 10 and a first composite sheet S1'. The first composite sheet S1 'may be composed of a flat plate body FB and unlike the first composite sheet S1, the first composite sheet S1' extends from the flat plate body FB and is bent with respect to the flat plate body FB LB, and RB). In other words, the first composite sheet S1 'may be inserted only on the first surface 11a of the first flame-retardant outer cover 10, and not on the second surface 11b.

Referring to Figs. 14 and 15, the first flame-retardant outer cover 10 includes a first surface 11a extending from the first surface 11a via the first bending portion BP1, And a surface 11b. The thickness WD2 of the second surface 11b may be thicker than the thickness WD1 of the first surface 11a. The strength and rigidity of the battery pack housing 105 can be compensated by making the thickness WD2 of the second surface 11b larger than the thickness WD1 of the first surface 11a.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken in conjunction with the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100, 101, 102, 103, 104, 105: Battery pack housing
M: Molded product
10, 20: Flame retardant outer cover 30: metal pillar
S: composite sheet 1, 3, 4: flame-retardant layer 2:
H: Through hole

Claims (13)

Flame retardant outer cover with flame retardant resin; And
A composite sheet inserted into the flame-retardant outer cover,
Wherein the composite sheet comprises flame retardant layers including the flame retardant resin and a non-burned soft layer including a non-burned resin, the non-burned soft layer being disposed between the flame-
Wherein the non-burned soft layer comprises a continuous fiber reinforcement. The method according to claim 1,
Wherein the flame-retardant outer cover comprises a first bending portion,
Wherein the composite sheet includes a first bending portion and a second bending portion corresponding to the first bending portion,
Shaped article. The method according to claim 1,
Wherein the flame-retardant outer cover includes a first surface and a second surface extending from the first surface in a bent state with respect to the first surface,
Wherein the second surface has a greater thickness than the first surface,
Wherein the composite sheet has a first surface and a second surface,
Shaped article. The method according to claim 1,
Wherein said flame retardant is a homogeneous synthetic resin. The method according to claim 1,
Wherein the flame retardant outer cover further comprises at least one of a short fiber reinforcement and a long fiber reinforcement. The method according to claim 1,
Wherein the flame retardant outer cover further comprises at least one of glass short fibers and glass long fibers within a range of 20 wt% or more and 30 wt% or less with respect to the total weight of the flame retardant outer cover. The method according to claim 1,
Wherein the continuous fiber reinforcement is a glass continuous fiber and the continuous glass fiber is contained in an amount of not less than 30 wt% and not more than 60 wt% with respect to the total weight of the non-burned soft layer. The method according to claim 1,
Wherein the continuous fiber reinforcement is carbon continuous fiber and the carbon continuous fiber is contained in an amount of 10 wt% or more and 20 wt% or less with respect to the total weight of the non-burned soft layer. The method according to claim 1,
Wherein the flame-
At least one through-hole and at least one metal post inserted in the at least one through-hole. The method according to claim 1,
The flame-retardant outer cover is made of a polyethylene terephthalate (PET) resin,
Wherein the flame retardant layers are made of the PET resin,
Wherein the non-burned-up layer comprises polypropylene and glass continuous fibers. The method according to claim 1,
The flame-retardant outer cover is made of a polyamide (PA) resin,
Wherein the flame retardant layers are composed of the PA resin,
Wherein the non-burned-up layer comprises polypropylene and glass continuous fibers. A first flame retardant outer cover including a flame retardant resin;
A second flame retardant outer cover including the flame retardant resin and combined with the first flame retardant outer cover;
A storage space formed between the first flame-retardant outer cover and the second flame-retardant outer cover; And
And a composite sheet disposed between at least one of the first flame-retardant outer cover and the second flame-retardant outer cover and the storage space, the composite sheet being inserted into at least one of the first flame-retardant outer cover and the second flame- And,
Wherein the composite sheet comprises flame retardant layers including the flame retardant resin and a non-burned soft layer including a non-burned resin, the non-burned soft layer being disposed between the flame-
Wherein the non-burned soft layer comprises a continuous fiber reinforcement. A battery pack housing according to claim 12; And
And a battery cell mounted in the storage space.

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