KR20220032901A - Battery pack cabinet and preparation method therefor - Google Patents

Abstract

The present invention relates to a CFRP battery pack cabinet structure, and more specifically, to a CFRP battery pack cabinet that is built into an electric or hybrid vehicle and has an improved structure to have excellent heat dissipation performance even when the CFRP battery pack cabinet in which a large high voltage battery pack is installed and stored is made of a high-strength polymer material such as reinforced plastic, and a manufacturing method thereof.

Description

CFRP battery pack cabinet and manufacturing method thereof

The present invention relates to a CFRP battery pack cabinet structure, and more specifically, heat dissipation performance even when the CFRP battery pack cabinet built into an electric or hybrid vehicle and a large high voltage battery pack is installed and stored is made of a high-strength polymer material such as reinforced plastic. The present invention relates to a CFRP battery pack cabinet having an improved structure and a manufacturing method therefor.

BACKGROUND Electric and hybrid vehicles typically use battery packs containing high voltage batteries of 300 volts or more for storage of electrical energy. Power from such a battery pack can be applied to an electric motor, a traction motor to propel the vehicle. These battery packs consist of a plurality of individual cells suitably connected together in series and parallel to meet voltage and energy storage requirements. In general, such a battery pack includes a high-voltage contactor and bus bar for charging and discharging the battery pack, as well as a system for monitoring and controlling the state of the battery. The battery pack is often encased in a lightweight, non-structural casing and may include cooling to keep the battery in the desired operating range.

Even with high-powered batteries using advanced battery chemistries (such as lithium-ion batteries), the weight of a battery pack can be significant and constitute a significant portion of the vehicle's weight. Adding to the vehicle weight is the need for a cabinet comprising a tray or similar support structure and a cover for securing the battery pack to the vehicle. Of course, these cabinets must be suitably rigid and stiff to accommodate the dynamic loads that will occur during service in addition to the static loads, and these structural cabinets must be compatible with the vehicle's adjacent chassis or body members.

In the meantime, CFRP battery pack cabinets have been mainly made of steel or magnesium. In this case, there was no problem dissipating the heat source from the use of the battery, but the relatively dense steel adds more vehicle weight than desired, and magnesium, despite its low density, is susceptible to corrosion when exposed to an aqueous environment and has limited ductility. There was a problem.

In order to solve this problem, high-strength polymer materials such as carbon fiber reinforced (Thermo, Thermoset) Plastic (CFR(T)P) materials are used instead of metal for the purpose of reducing the weight. of CFRP battery pack cabinet was manufactured and actually accommodated the battery pack as shown in FIG. 1A.

However, the CFRP battery pack cabinet made of high-strength polymer materials such as reinforced plastic has lower thermal conductivity (2.0~3.0W/mK in the plane direction, less than 1.0W/mK in the thickness direction) compared to steel (46W/mK). there is a problem called In particular, although heat is well dissipated in the plane direction, there is a problem in that the thermal conductivity is low in the thickness direction through which heat must escape.

Accordingly, there is a need to develop a technology capable of providing a CFRP battery pack cabinet that is lighter and easier to manufacture while solving these problems.

Republic of Korea Patent Registration No. 10-1939617

The present inventors have completed the present invention by developing a CFRP battery pack cabinet with a new structure that can solve the problems of the CFRP battery pack cabinet made of a high-strength polymer material as a result of numerous research efforts.

Therefore, the object of the present invention is conventionally composed of metal, so there is no heat dissipation problem due to battery use. However, for the purpose of weight reduction, low thermal conductivity of the material when manufacturing a battery cabinet with a high-strength polymer material such as reinforced plastic (plane direction 2.0 ~ 3.0 W / mK , 0.5W/mK or less in the thickness direction), reduce the thickness to a defective thickness during manufacturing, or solve the problem without using expensive heat-dissipating polymer, thereby improving the performance and lifespan of the battery pack It is to provide a CFRP battery pack cabinet of a new structure that can increase the , and a method for manufacturing the same.

The object of the present invention is not limited to the object mentioned above, and even if not explicitly mentioned, the object of the invention that can be recognized by a person of ordinary skill in the art from the description of the detailed description of the invention to be described later may also be included. .

In order to achieve the object of the present invention described above, the present invention provides a lower case member in which a lower internal space having a predetermined volume is formed in an open upper portion and a lower connection formed by extending integrally from both ends of the lower case member a support case part made of a high-strength polymer material including a member; The upper case member having an upper internal space having a predetermined volume to cover the upper part of the lower internal space formed by the lower case member is formed in an open form at the bottom and the upper case member is integrally formed from both ends of the upper case member and a cover case part made of a high-strength polymer material including an upper connection member formed to cover the lower connection member; and at least one of the lower case member and the upper case member, one end of which is inserted into the inside and the other end of the plurality of batteries installed so as to be in contact with the outer surface to be embedded in the lower and upper internal spaces. It provides a CFRP battery pack cabinet comprising a; a heat dissipation unit including a plurality of heat dissipation units for dissipating heat generated in the pack in the thickness direction.

In a preferred embodiment, the heat dissipation unit is installed at a position opposite to an upper surface or a lower surface of the battery pack among the outer surfaces of the lower case member and the upper case member, wherein the lower case member and the upper case member are It further includes a position indicating member corresponding to the position where the heat dissipation unit is installed on the outer surface.

In a preferred embodiment, the position indicating member includes a plurality of display grooves having a predetermined shape shallowly formed on the surfaces of the lower case member and the upper case member, or a plurality of insertion holes formed to a depth corresponding to the insertion depth of the heat dissipation unit. one or more of

In a preferred embodiment, the heat dissipation unit has a Z-fin structure composed of a material with high thermal conductivity including at least one of metal, carbon material, ceramic and heat dissipation polymer, and includes a plate-shaped head member having a thickness of 3 mm or less and the It includes a pillar member extending integrally from the lower center of the head member and having a smaller diameter toward the end.

In a preferred embodiment, the heat dissipation unit is installed on the outer surface of at least one of the lower case member and the upper case member by an ultrasonic welding machine.

In a preferred embodiment, the high-strength polymer material is a thermoplastic fiber-reinforced composite material manufactured by impregnating or prepregging reinforcing material fibers in a resin used as a base material, and the reinforcing material fibers include glass fibers, carbon fibers, aramid fibers, basalt fibers, and Any one or more selected from the group consisting of mixtures thereof, and the resin used as the base material is polypropylene, polyethylene, low density polyethylene, high density polyethylene, polyester (polyester), polystyrene, polyvinyl chloride, modified polyphenyleneoxide, polyamide6, polyamide610 (polyamide610), polyamide66 (polyamide66), polyphenyl Polyphenylene sulfide, ABS (acrylonitrile butadiene styrene), polycarbonate, polyurethane, polybutylene terephthalate, polyacetal, polysulfone, poly Arylsulfone, polyphenylsulfone, polyethersulfone, polyetheretherketone, polyamideimide, polyetherimide, polytetrafluoroethylene, PTFE ), and at least one selected from the group consisting of mixtures thereof.

In a preferred embodiment, it further comprises a potential difference corrosion prevention layer formed on the surface of the lower case member and the upper case member in which the heat dissipation portion is formed.

In addition, the present invention comprises the steps of preparing a support case portion and a cover case portion with a thermoplastic fiber-reinforced composite material; and one end is inserted into the outer surface of at least one of the lower case member of the support case part and the upper case member of the cover case part, and the lower surface of the other end is surfaced with the outer surface, or the upper surface of the other end is the outer surface It provides a method of manufacturing a CFRP battery pack cabinet comprising; installing a plurality of heat dissipating units to form a heat dissipation unit so as to be on the same plane as the CFRP battery pack cabinet.

In a preferred embodiment, the step of preparing the support case part and the cover case part corresponds to a position where the heat dissipation unit is installed among the outer surfaces of any one or more of the lower case member of the support case part and the upper case member of the cover case part It is performed including the step of forming a display member.

In a preferred embodiment, the forming of the position indicator member includes forming a plurality of display grooves having a predetermined shape on the outer surfaces of the lower case member and the upper case member to a shallow depth or to a depth corresponding to the insertion depth of the heat dissipation unit. It is performed by forming a plurality of insertion holes.

In a preferred embodiment, in the step of forming the heat dissipation unit, a plurality of heat dissipation units are installed in an ultrasonic welding machine to face a plurality of display grooves having a predetermined shape shallowly formed on the outer surface of at least one of the lower case member and the upper case member. and then inserting and fusing the plurality of heat dissipating units by the ultrasonic welding machine to have an insertion depth of 99% or less of the thickness of the case member at the same time; Alternatively, a plurality of heat dissipation units are disposed so that one end is inserted into a plurality of insertion holes formed on the outer surface of at least one of the lower case member and the upper case member and the other end is interviewed on the outer surface, and then disposed using an ultrasonic welding machine Inserting and fusing a plurality of heat-dissipating units at the same time to have an insertion depth of 99% or less of the thickness of the case member;

In a preferred embodiment, the method further includes forming a potential difference corrosion prevention layer on the surfaces of the lower case member and the upper case member on which the heat dissipation part is formed.

In addition, the present invention is any one of the above-described CFRP battery pack cabinet or CFRP battery pack cabinet manufactured by any one of the above-described manufacturing method; and two or more battery packs installed inside the cabinet.

According to the above-described CFRP battery pack cabinet and its manufacturing method of the present invention, it is made of metal and there is no heat dissipation problem due to the use of the battery. (2.0~3.0W/mK in the face direction, 0.5W/mK or less in the thickness direction) It is possible to increase the performance and lifespan of the built-in battery pack.

These technical effects of the present invention are not limited only to the above-mentioned range, and even if not explicitly mentioned, the effects of the invention that can be recognized by those of ordinary skill in the art from the description of the specific content for the implementation of the invention to be described later of course included

1A is a real photo showing a state in which the battery pack is stored in a known CFRP battery pack cabinet made of a high-strength polymer material, FIG. 1B is a real photo of a known CFRP battery pack cabinet made of a high-strength polymer material, and FIG. A schematic cross-sectional view of a known CFRP battery pack cabinet made of a polymer material.
Figure 2a is a schematic cross-sectional view showing the structure of the CFRP battery pack cabinet according to the first and second embodiments of the present invention, Figure 2b is before the heat dissipation part is formed in the CFRP battery pack cabinet according to the first embodiment It is an exploded cross-sectional view, and FIG. 2C is an isolated cross-sectional view before the heat dissipation part is formed in the CFRP battery pack cabinet according to the second embodiment. 2D is a schematic cross-sectional view showing the structure of a CFRP battery pack cabinet according to a third embodiment of the present invention, and FIG. 2E is an exploded cross-sectional view before the heat dissipation part is formed in the CFRP battery pack cabinet according to the third embodiment. 2F is a vertical sectional view of an electric energy application product in which a battery is built in a CFRP battery pack cabinet according to the first and second embodiments of the present invention.
Figure 3a is a schematic combined cross-sectional view showing the structure of the CFRP battery pack cabinet according to the fourth embodiment of the present invention, Figure 3b is an exploded cross-sectional view before the heat dissipation part is formed in the CFRP battery pack cabinet according to the fourth embodiment of the present invention.
4A and 4B show different embodiments of the heat dissipation unit used in the CFRP battery pack cabinet of the present invention.
5A is a plan view of a state in which the cover case part is removed in a state in which the battery is accommodated in the CFRP battery pack cabinet according to the first embodiment of the present invention, and FIGS. 5B and 5C are the CFRP battery according to the first embodiment of the present invention. It is an exploded perspective view and a plan view of the pack cabinet.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the description of the invention exists, but is not limited to one or more other It is to be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present invention, it should not be interpreted in an ideal or excessively formal meaning. does not

In interpreting the components, it is construed as including an error range even if there is no separate explicit description. In particular, when the terms "about", "substantially", etc. of degree are used, they may be construed as being used in a sense at or close to the numerical value when manufacturing and material tolerances inherent in the stated meaning are presented. .

In the case of a description of a temporal relationship, for example, 'after', 'following', 'after', 'before', etc., when temporal precedence is described, 'immediately' or 'directly' Unless ' is used, cases that are not continuous are included.

Hereinafter, the technical configuration of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Like reference numbers used to describe the invention throughout the specification refer to like elements.

The technical feature of the present invention is the low thermal conductivity of high-strength polymer materials such as reinforced plastics, particularly the low thermal conductivity in the thickness direction, which reduces the thickness of the battery to a defective thickness during manufacturing, such as a decrease in battery life caused by heat generated. It is in a CFRP battery pack cabinet with a new structure that can be solved without the use of heat dissipation polymers or expensive heat dissipation polymers.

That is, in the case of the conventionally known electric vehicle battery cabinet, when it is made of steel (or magnesium), there is no problem of heat source dissipation due to the use of the battery, but carbon fiber reinforced (Thermo, Thermoset) The battery cabinet manufactured using plastic, CFR(T)P) material has a lower thermal conductivity (2.0~3.0W/mK in the plane direction, less than 0.5W/mK in the thickness direction) compared to steel (46W/mK). This is because there was a problem of excessive temperature rise due to heat generation. In particular, although the thermal conductivity in the plane direction is low, there is a problem that the thermal conductivity is much lower in the thickness direction through which heat must escape.

Therefore, the CFRP battery pack cabinet of the present invention is a lower case in which a lower internal space having a certain volume is formed in an open top form in order to solve the problem of low thermal conductivity of high-strength polymer material, especially in the thickness direction. a support case part made of a high-strength polymer material including a member and a lower connecting member extending integrally from both ends of the lower case member; The upper case member having an upper internal space having a predetermined volume to cover the upper part of the lower internal space formed by the lower case member is formed in an open form at the bottom and the upper case member is integrally formed from both ends of the upper case member and a cover case part made of a high-strength polymer material including an upper connection member formed to cover the lower connection member; and at least one of the lower case member and the upper case member, one end of which is inserted into the inside and the other end of the plurality of batteries installed so as to be in contact with the outer surface to be embedded in the lower and upper internal spaces. It includes a; Here, the high-strength polymer material may be a thermoplastic fiber-reinforced composite material manufactured by impregnating or prepregging reinforcing material fibers in a thermoplastic resin used as a base material.

In particular, the heat dissipation unit is installed at a position opposite to the upper surface or the lower surface of the battery pack among the outer surfaces of the lower case member and the upper case member, and the lower case member and the upper case member are the outer surfaces of which the heat dissipation unit is installed. It may further include a position indicating member corresponding to the position. Here, the position indicating member may be one or more of a plurality of display grooves having a predetermined shape shallowly formed on the surfaces of the lower case member and the upper case member, or a plurality of insertion holes formed to a depth corresponding to the insertion depth of the heat dissipation unit.

In this way, in the CFRP battery pack cabinet of the present invention, in order to increase the thermal conductivity in the thickness direction through which heat must escape, a predetermined position of the outer surface of the lower case member and the upper case member in the thickness direction of at least one of the upper case member, that is, the upper part of the battery pack to be accommodated It has a configuration in which a heat dissipation unit is formed on the position indication member formed at a position opposite to the surface or the lower surface, and the heat dissipation unit is formed of a material having high thermal conductivity including at least one of metal, ceramic, and heat dissipation polymer. A plurality of heat dissipation units. include

Figure 2a is a schematic cross-sectional view showing the structure of the CFRP battery pack cabinet according to the first and second embodiments of the present invention, Figure 2b is before the heat dissipation part is formed in the CFRP battery pack cabinet according to the first embodiment It is an exploded cross-sectional view, and FIG. 2C is an isolated cross-sectional view before the heat dissipation part is formed in the CFRP battery pack cabinet according to the second embodiment. Figure 2d is a schematic combined cross-sectional view showing the structure of a CFRP battery pack cabinet according to a third embodiment of the present invention, Figure 2e is an exploded cross-sectional view before the heat dissipation part is formed in the CFRP battery pack cabinet according to the third embodiment, Fig. 2f is a vertical cross-sectional view of an electric energy application product in which a battery is built in a CFRP battery pack cabinet according to the first and second embodiments of the present invention. Figure 3a is a schematic combined cross-sectional view showing the structure of the CFRP battery pack cabinet according to the fourth embodiment of the present invention, Figure 3b is an exploded cross-sectional view before the heat dissipation part is formed in the CFRP battery pack cabinet according to the fourth embodiment of the present invention. 4A and 4B show different embodiments of the heat dissipation unit used in the CFRP battery pack cabinet of the present invention, and FIG. 5A is a CFRP battery pack cabinet according to the first embodiment of the present invention in a state in which the battery is accommodated. It is a plan view with the cover case part removed, and FIGS. 5B and 5C are an exploded perspective view and a plan view of the CFRP battery pack cabinet according to the first embodiment of the present invention.

First, the structure according to the first to third embodiments of the CFRP battery pack cabinet of the present invention will be described in detail with reference to FIGS. 2A to 2E and 4A to 5C. As will be described later, the CFRP battery pack cabinet 100 of the present invention, namely, the first embodiment shown in FIGS. 2A and 2B, the second embodiment shown in FIGS. 2A and 2C, and the second embodiment shown in FIGS. 2D and 2E. All three embodiments have the same basic configuration and have only minute differences, such as the structure of the position indication member and the installation position of the head member 131a of the heat dissipation unit 131, so that the second embodiment Only configurations that are different from the embodiment and the third embodiment will be described.

That is, in the case of the first embodiment and the second embodiment, which differ only in the structure of the position indicating member, the first embodiment has a structure in which the structure of the position indicating member is a lower insertion hole 114b and an upper insertion hole 124b, and the second embodiment This is because the structure of the position indication member is the same except that the structure of the position indication member is different only in that it has the structure of the lower display groove 114a and the upper display groove 124a. In addition, the first and third embodiments show the structure of the position display member and the heat dissipation unit 131 when the heat dissipation unit 131 is inserted into the lower case member 111 and the upper case member 121 by an ultrasonic welding machine. This is because only the position of the head member 131a is different and other structures are the same. On the other hand, in the case of the third embodiment, the structure of the lower insertion hole 114b and the upper insertion hole 124b may be formed from the beginning as shown in FIG. If it is, the heat dissipation unit 130 may be formed in the same structure as in FIG. 2D .

As shown in FIGS. 2A to 2E , the CFRP battery pack cabinet 100 according to the first to third embodiments of the present invention includes a support case unit 110 , a cover case unit 120 , and a heat dissipation unit 130 . ) and a case fixing unit 140 . If necessary, it may further include a potential difference corrosion prevention layer (not shown).

The support case unit 110 is made of a high-strength polymer material, and includes a lower case member 111 and a lower connection member 112 as shown in FIGS. 2B, 2C, and 2E. In some cases, the lower position indicating member 114 may be further included.

The lower case member 111 may have an open upper portion so that the lower internal space 113 having a predetermined volume can accommodate the battery pack 200 .

The lower connection member 112 is integrally formed from both ends of the lower case member 111, particularly from both ends in the longitudinal direction, and may be formed simultaneously with the lower case member 111 through injection molding or the like. As shown in one embodiment, it may be a long and narrow plate-shaped structure extending parallel to the ground, and, although not shown, has a structure in which a plurality of through-holes through which the case fixing part 140 passes are spaced apart and formed. will be able At this time, the inner wall of the through hole is threaded, so that the coupling structure between the support case part 110 and the cover case part 120 can be made solid by the case fixing part 140 . In some cases, as shown in FIGS. 5A and 5B , the lower connection member 112 may be formed to extend integrally from all ends of the lower case member 111 , that is, from the ends in the width direction and the length direction, respectively. .

The lower position indicating member 114 is for indicating the position where the heat dissipation part 130 is formed, and may be formed simultaneously with the lower case member 111 through injection molding, etc., on the outer surface side of the lower case member 111 . The battery pack 200 may be formed at a position corresponding to a position where the battery pack 200 is to be disposed, that is, a position corresponding to a lower portion of the installed battery pack 200 .

Here, the lower position indicating member 114 is a plurality of lower display grooves 114a having a predetermined shape shallowly formed on the outer surface of the lower case member 111 or a plurality of formed to a depth corresponding to the insertion depth of the heat dissipation unit 131 . It may be formed of any one or more of the lower insertion hole (114b) of the. The plurality of lower display grooves 114a are formed in such a way that a portion of the thickness of the lower case member 111 is shallowly removed from the outer surface thereof, and a certain shape is implemented with shallow grooves or lines as shown in FIG. 2C . can be formed with The plurality of lower insertion holes 114b are formed to have a depth of 0.2 mm or more from the outer surface and 90% or less of the total thickness of the lower case member 111. The diameter and shape of the holes formed on the outer surface are heat dissipation. As long as the column member 131b of the unit 131 can be inserted, it is not limited. As an embodiment, the diameter of the hole formed on the outer surface may be configured to have a minus tolerance of 0.2 mm or more based on the diameter of the column member 131b of the heat dissipation unit 131 . In some cases, the lower insertion hole 114b may be formed as a through hole penetrating the lower case member 111 in the thickness direction.

As such, the size and shape of the lower insertion hole 114b is not limited as long as a part of the heat dissipation unit 131 can be inserted, but it may have a shape that becomes larger or narrower as it approaches the lower internal space 113, As an embodiment, the side wall may have a cylindrical shape as shown in FIG. 2B based on the hole on the outer surface side, but may have a shape that opens at an angle of 10° or less toward the inside, or has a shape that is narrowed as shown in FIG. 2E. In particular, if the insertion hole 114b is implemented in a shape in which the diameter slightly increases toward the inside of the side wall extending from the hole on the outer surface side as shown in FIG. 2b, it is easy to arrange the heat dissipation unit 131 in the insertion hole 114b, and , the head member 131a of the heat dissipation unit 131 disposed in the lower insertion hole 114b by the inserting technique even during thermal welding with an ultrasonic welding machine is shown in FIG. It can be installed horizontally to form a part.

The cover case part 120 is made of a high-strength polymer material, and includes an upper case member 121 and an upper connection member 122 as shown in FIGS. 2B, 2C, and 2E. In some cases, the upper position indicating member 124 may be further included.

The upper case member 121 is sized to cover the upper part of the lower internal space 113 formed by the lower case member 111 and the upper internal space 123 having a predetermined volume may be formed in an open lower part. .

The upper connection member 122 is integrally formed from both ends of the upper case member 121, particularly from both ends in the longitudinal direction, and may be formed simultaneously with the upper case member 121 through injection molding or the like. As shown in one embodiment, it may be a long and narrow plate-shaped structure extending parallel to the ground, and, although not shown, has a structure in which a plurality of through-holes through which the case fixing part 140 passes are spaced apart and formed. will be able At this time, the inner wall of the through hole is threaded, so that the coupling structure between the support case part 110 and the cover case part 120 can be made solid by the case fixing part 140 . In some cases, as shown in FIGS. 5A to 5C , the upper connection member 122 may be formed to extend integrally from all ends of the upper case member 121, that is, from the ends in the width direction and the length direction, respectively. .

The upper position indicating member 124 is for indicating the position where the heat dissipation part 130 is formed, and may be formed simultaneously with the upper case member 121 through injection molding, etc., on the outer surface side of the upper case member 121 . It may be formed in a position corresponding to a position where the battery pack 200 is to be disposed, that is, a position corresponding to an upper portion of the installed battery pack 200 .

Here, the upper position display member 124 is a plurality of upper display grooves 124a having a predetermined shape shallowly formed on the outer surface of the upper case member 121 or a plurality of formed to a depth corresponding to the insertion depth of the heat dissipation unit 131 . It may be formed of any one or more of the upper insertion hole (124b) of the. The plurality of upper display grooves 124a and the plurality of upper insertion holes 124b are provided with the lower display groove 124a and the lower insertion hole 114b and the upper case member 121 formed in the lower case member 111 described above. Since they have the same configuration except that they are different, the description of the lower display groove 124a and the lower insertion hole 114b described above will be borrowed, and detailed descriptions will be omitted.

As shown in FIGS. 2A to 2E , the support case part 110 and the cover case part 120 are disposed to face each other and may have substantially the same structure, in this case the lower case member 111 and The heat dissipation units 131 respectively formed on the upper case member 121 are formed at positions opposite to each other to increase the heat dissipation efficiency, and the support case unit 110 and the cover case unit 120 using a single mold. ) can be produced, thus lowering the production cost. If necessary, the support case part 110 and the cover case part 120 are coupled to each other, and the lower internal space 113 and the upper internal space 123 form one closed space, and the heat dissipation part 130 is disposed. Of course, it may be formed by being deformed to have different sizes. Also at this time, if the heat dissipation units 131 respectively formed on the lower case member 111 and the upper case member 121 are formed at positions opposite to each other, the heat dissipation efficiency may be increased.

The high-strength polymer material constituting the support case unit 110 and the cover case unit 120 may be a reinforced plastic manufactured by using at least one of carbon fiber and glass fiber in a known thermoplastic resin. Any one selected from the group consisting of glass fiber or pitch-based carbon fiber, polyacrylic carbon fiber, pitch-based carbon fiber chopped, pitch-based milled fiber, aramid fiber, and basalt fiber as a base material It may be a thermoplastic reinforced plastic manufactured by impregnating or prepreg.

Here, the thermoplastic resin used as the base material is polypropylene, polyethylene, low density polyethylene, high density polyethylene, polyester, polystyrene, polyvinyl chloride. (polyvinyl chloride), modified polyphenyleneoxide, polyamide6, polyamide610 (polyamide610), polyamide66, polyphenylene sulfide, ABS (acrylonitrile butadiene styrene) ), polycarbonate, polyurethane, polybutylene terephthalate, polyacetal, polysulfone, polyarylsulfone, polyphenylsulfone Any one selected from the group consisting of , polyethersulfone, polyetheretherketone, polyamideimide, polyetherimide, and polytetrafluoroethylene (PTFE) may be used. there is.

The heat dissipation unit 130 is installed by an ultrasonic welding machine on the outer surface side of the lower case member 111 and/or the upper case member 121 to form a part of the lower case member 111 and/or the upper case member 121 . and a component that radiates heat generated in the internal space formed of the lower internal space 113 and the upper internal space 123 in the thickness direction, and includes a plurality of heat dissipation units 131, including a lower case member 111 and It may be installed at a position opposite to the upper surface and/or the lower surface of the built-in battery pack 200 among the outer surfaces of the upper case member 121 . In particular, when a plurality of heat dissipation units 131 included in the heat dissipation unit 130 are installed at positions corresponding to the upper and/or lower portions of the battery pack 200 in which they are built, a group may be formed as shown in FIG. 5C . Thus, the number of built-in battery packs can be known through the arrangement group of the heat dissipation unit 131 included in the heat dissipation unit 130 installed in the cover case 120 . However, in all drawings of the present invention, each component is illustratively drawn for easy visualization of its structure and coupling relationship, and the size of the illustrated component does not take into account the actual size and ratio between each component in the actual product. It should be interpreted with this in mind.

The heat dissipation unit 131 is made of a material with high thermal conductivity including at least one of metal, carbon material, ceramic and heat dissipation polymer, and any known structure can be used as long as it has a structure that can be inserted in the z-axis direction. As an embodiment, as shown in FIGS. 4A and 4B , the vertical cross-section including the head member 131a and the pillar member 131b may have a T-shaped Z-pin structure. In particular, the metal is not limited as long as it has high thermal conductivity and is a lightweight metal, but as one embodiment, aluminum, copper, gold, tungsten, cast iron, iron, carbon steel, nickel, silver, stainless steel, SUS, titanium, and alloys thereof It may be any one selected from the group, and in consideration of thermal conductivity and price, it may be copper, aluminum, and alloys thereof.

The head member 131a has a plate-like structure with a parallel surface having a thickness of 3 mm or less, and when the heat generated from the built-in battery pack 200 is transferred through the pillar member 131b, it must be discharged to the outside air, so that the surface area is as wide as possible. A plurality of irregularities may be formed on the surface to have a

The pillar member 131b is a component extending integrally from the lower center of the head member 131b, and has a length of 99% or less of the thickness of the lower case member 111 and the upper case member 121, as shown in FIG. 4A. Likewise, it may have a structure in which the diameter becomes smaller toward the end thereof. On the other hand, when the lower insertion hole 114b and the upper insertion hole 114b are implemented in the form of a through hole, the length of the pillar member 131b may be the same as the thickness of the lower case member 111 and the upper case member 121 . Although not shown, it may be implemented in a cylindrical structure having the same upper and lower diameters. In this case, the upper and lower position indicating members 114 and 124 are preferably implemented in the form of a lower insertion hole 114b and an upper insertion hole 114b. can do. In addition, as shown in Fig. 4b, by forming various types of irregularities on the outer surface of the pillar member 131b by a method such as abrasive cloth or sandblasting, the lower case member 111 and the upper part are fused with an ultrasonic welding machine. The coupling force with the case member 121 may be improved.

The case fixing part 140 includes the support case part 110 and the cover so that the lower internal space 113 and the upper internal space 123 form one closed internal space so that a plurality of battery packs 200 can be installed. As a component for coupling the case part 120 to each other, as long as the lower connection member 112 of the support case part 110 and the upper connection member 122 of the cover case part 120 can be coupled and fixed, all known A configuration may be adopted, and a bolt and nut structure may be used as shown in FIGS. 2A to 2F as an embodiment.

The potential difference corrosion prevention layer (not shown) is a component formed on the surface of the lower case member 111 and/or the upper case member 121 on which the heat dissipation part 130 is formed, and is a component formed on the surface of the inserted metal and It can perform a function to prevent potential difference corrosion by CFRP. As long as the potential difference corrosion prevention layer can block contact with moisture, any known technical configuration can be used. there is.

Next, a structure according to a fourth embodiment of the CFRP battery pack cabinet of the present invention will be described in detail with reference to FIGS. 3A and 3B .

As shown in FIGS. 3A and 3B , in the CFRP battery pack cabinet 100 according to the fourth embodiment, the heat dissipation unit 130 is not formed in the support case unit 110 , and the heat dissipation unit only in the cover case unit 120 . Since it is the same as the CFRP battery pack cabinet 100 according to the first embodiment except that 130 is formed, a detailed description thereof will be omitted. Although not shown, it is of course possible to form the CFRP battery pack cabinet 100 having a structure in which the heat dissipation unit 130 is installed only on the cover case unit 120 in the second and third embodiments.

Next, the CFRP battery pack cabinet manufacturing method of the present invention comprises the steps of preparing a support case part and a cover case part with a thermoplastic fiber-reinforced composite material; and one end is inserted into the outer surface of at least one of the lower case member and the upper case member of the cover case portion of the support case portion, and the other end is surfaced with the outer surface, or the upper surface of the other end is flush with the outer surface. and installing a plurality of heat dissipating units so as to form a heat dissipating unit.

First, the step of preparing the support case part and the cover case part is a known method by preparing a mold considering the shape of the upper and lower case members and the upper and lower connection members of a size that can form a sufficient internal space in consideration of the number of battery packs inserted. It can be carried out by injection molding with a thermoplastic reinforced plastic material. If necessary, it can be carried out including the step of forming the position indicating member corresponding to the position where the heat dissipation unit is installed among the outer surfaces of any one or more of the lower case member of the support case part and the upper case member of the cover case part when manufacturing the mold. That is, a structure capable of forming a plurality of display grooves having a predetermined shape on the outer surfaces of the lower case member and the upper case member shallowly or forming a plurality of insertion holes with a depth corresponding to the insertion depth of the heat dissipation unit is inserted into the mold. because you can do it

As an embodiment, the support case part 110 and the cover case part 120 having the structure shown in FIG. 2B have lower and upper insertion holes 114b into which the column member 131a of the heat dissipation unit 131 can be inserted. /124b) can be easily prepared by injection molding by preparing a mold containing a plurality of structures that are spaced apart from each other.

After that, a plurality of heat dissipation units 131 having a column member 131b that can be held by being inserted into the lower or upper insertion holes 114b/124b formed in the support case unit 110 or the cover case unit 120 are provided. Prepare and arrange a plurality of heat dissipation units so that one end is inserted into each lower or upper insertion hole (114b/124b) and the other end is interviewed on the external surface, and then a plurality of heat dissipation units disposed using an ultrasonic welding machine are simultaneously placed in a case The heat dissipation unit 130 may be formed by insertion and fusion to have an insertion depth of 99% or less of the member thickness. Here, the ultrasonic welding machine is preferably operated under low amplitude (15 to 120 mm) and low pressure (1 to 3 bar) conditions. .

In addition, the lower surface of the head member 131a of the heat dissipation unit 131 by adjusting one or more of the depth of the lower or upper insertion hole 114b/124b, the length of the column member 131b and the insertion depth is the support case part ( 110) or the outer surface of the cover case part 120 may be installed to face the surface, or the upper surface thereof may be positioned on the same plane as the outer surface. At this time, as described above, the heat dissipation unit 131 may have a Z-fin structure, and the heat dissipation unit 131 may be manufactured by a known method depending on the material. In one embodiment, in the case of a metal, it can be easily manufactured by casting.

In this way, when the support case part 110 and/or the cover case part 120 in which the heat dissipation part 130 is formed respectively formed of the plurality of heat dissipation units 131 is prepared, the support case part 110 in which the heat dissipation part 130 is formed and/or coating a paint such as paint on the surface of the cover case unit 120 to form a potential difference corrosion prevention layer.

After that, when the upper portion of the support case unit 110 on which the heat dissipation unit 130 is formed is covered with the cover case unit 120 having the heat dissipation unit 130 formed thereon and fixed with the case fixing unit 140 , the CFRP battery pack cabinet 100 . can be completed.

In this way, when the CFRP battery pack cabinet 100 is prepared, the heat dissipation unit 130 is disposed in an accommodable number of the battery packs 200 in the support case unit 110 in which the heat dissipation unit 130 is not formed or not. By covering the formed cover case part 120 and fixing it with the case fixing part 140 , an electric energy application product having a built-in battery pack 200 can be prepared as shown in FIGS. 5A to 5C . As an example of an electric energy application product including such a CFRP battery pack cabinet, an electric vehicle or a hybrid vehicle may be representative.

Experimental example

In order to measure the heat dissipation performance, as a control, a CFRP battery pack cabinet made of carbon fiber reinforced fiber material having a battery pack having the structure shown in FIGS. 1A to 1C installed in a conventional electric vehicle or hybrid vehicle, and the present invention After using the CFRP battery pack cabinet having the structure according to the first embodiment and configuring the same conditions as the control group, the temperature of each part is measured according to the operating time after the battery is operated at the position shown in FIGS. 1C and 2F, and the result is shown in Table 1 below. The internal atmospheric temperature (T1) around the battery was measured using a k-type thermocouple, and the external surface temperature of the case just above the battery (T2) and the external surface temperature of the case where the battery is not located (T3) were also measured.

Control (℃) Example 1 (℃) uptime T1 T2 T3 T1 T2 T3 0h 20 20 20 20 20 20 0.5h 31 27 25 31 29 26 1h 38 31 29 34 32 30 2h 40 33 29 35 33 31 4h 41 31 31 35 34 32

From Table 1, it can be seen that, in the case of the CFRP battery pack cabinet according to the first embodiment of the present invention, the heat dissipation performance in the thickness direction is excellent compared to the CFRP battery pack cabinet made of a conventional carbon fiber reinforced fiber material as a control.

As such, even if the CFRP battery pack cabinet is made of high-strength polymer, if it has the same structure as the present invention, it is possible to achieve weight reduction without the problems of the conventional CFRP battery pack cabinet made of carbon fiber reinforced fiber material. This will be possible.

As described above, the present invention has been illustrated and described with reference to preferred embodiments, but it is not limited to the above-described embodiments, and within the scope of not departing from the spirit of the present invention, those of ordinary skill in the art to which the present invention pertains Various changes and modifications will be possible.

100: CFRP battery pack cabinet 110: support case part
111: lower case member 112: lower connection member
113: lower interior space 114: lower position indicating member
114a: lower display groove 114b: lower insertion hole
120: cover case part 121: upper case member
122: upper connection member 123: upper interior space
124: upper position indicating member 124a: upper display groove
124b: upper insertion hole 130: heat dissipation part
131: heat dissipation unit 131a: head member
131b: column member 140: case fixing part
200: battery pack

Claims (14)

a support case part made of a high-strength polymer material including a lower case member in which a lower internal space having a predetermined volume is formed in an open upper portion and lower connection members extending integrally from both ends of the lower case member;
The upper case member having an upper internal space having a predetermined volume to cover the upper part of the lower internal space formed by the lower case member is formed in an open form at the bottom and the upper case member is integrally formed from both ends of the upper case member and a cover case portion made of a high-strength polymer material including an upper connecting member formed to cover the lower connecting member; and
A plurality of battery packs installed in the outer surface side of at least one of the lower case member and the upper case member so that one end thereof is inserted into the interior and the other end faces the outer surface, the plurality of battery packs being embedded in the lower internal space and the upper internal space CFRP battery pack cabinet comprising a;
The method of claim 1,
The heat dissipation unit is installed at a position opposite to an upper surface or a lower surface of the battery pack among the outer surfaces of the lower case member and the upper case member, wherein the lower case member and the upper case member are disposed on the outer surfaces of the heat dissipation unit CFRP battery pack cabinet, characterized in that it further comprises a position indicating member corresponding to the position where the unit is installed.
3. The method of claim 2,
The position indicating member is at least one of a plurality of display grooves having a predetermined shape shallowly formed on the surfaces of the lower case member and the upper case member or a plurality of insertion holes formed to a depth corresponding to the insertion depth of the heat dissipation unit. CFRP battery pack cabinet.
The method of claim 1,
The heat dissipation unit is a Z-fin structure composed of a material with high thermal conductivity including at least one of metal, carbon material, ceramic and heat dissipation polymer, and is integrated with a plate-shaped head member having a thickness of 3 mm or less and the lower center of the head member CFRP battery pack cabinet, characterized in that it comprises a pillar member extending toward the end and the diameter becomes smaller.
The method of claim 1,
The heat dissipation unit is a CFRP battery pack cabinet, characterized in that installed on the outer surface of any one or more of the lower case member and the upper case member by an ultrasonic welding machine.
The method of claim 1,
The high-strength polymer material is a thermoplastic fiber-reinforced composite material manufactured by impregnating or prepreg a reinforcing material fiber in a resin used as a base material,
The reinforcing material fiber is at least one selected from the group consisting of glass fiber, carbon fiber, aramid fiber, basalt fiber, and mixtures thereof,
The resin used as the base material is polypropylene, polyethylene, low density polyethylene, high density polyethylene, polyester, polystyrene, polyvinyl chloride. chloride), modified polyphenyleneoxide, polyamide6 (polyamide6), polyamide610 (polyamide610), polyamide66 (polyamide66), polyphenylene sulfide (polyphenylene sulfide), ABS (acrylonitrile butadiene styrene), Polycarbonate, polyurethane, polybutylene terephthalate, poly acetal, polysulfone, polyarylsulfone, polyphenylsulfone, polyline At least one selected from the group consisting of ethersulfone, polyetheretherketone, polyamideimide, polyetherimide, polytetrafluoroethylene (PTFE), and mixtures thereof CFRP battery pack cabinet, characterized in that.
7. The method according to any one of claims 1 to 6,
CFRP battery pack cabinet, characterized in that it further comprises a potential difference corrosion prevention layer formed on the surface of the lower case member and the upper case member on which the heat dissipation part is formed.
Preparing a support case part and a cover case part with a thermoplastic fiber-reinforced composite material; and
One end is inserted into the outer surface of at least one of the lower case member of the support case part and the upper case member of the cover case part, and the lower surface of the other end is surfaced with the outer surface, or the upper surface of the other end is with the outer surface A method of manufacturing a CFRP battery pack cabinet comprising a; forming a heat dissipation unit by installing a plurality of heat dissipation units so as to be on the same plane. 9. The method of claim 8,
The step of preparing the support case part and the cover case part may include forming a position indicating member corresponding to a position where the heat dissipation unit is installed among the outer surfaces of any one or more of the lower case member and the upper case member of the cover case part. CFRP battery pack cabinet manufacturing method comprising a.
10. The method of claim 9,
In the forming of the position indication member, a plurality of display grooves having a predetermined shape are shallowly formed on the outer surfaces of the lower case member and the upper case member, or a plurality of insertion holes are formed to a depth corresponding to the insertion depth of the heat dissipation unit. CFRP battery pack cabinet manufacturing method, characterized in that carried out by
11. The method of claim 10,
In the step of forming the heat dissipation unit, a plurality of heat dissipation units are installed in an ultrasonic welding machine opposite to a plurality of display grooves having a predetermined shape shallowly formed on the outer surface of at least one of the lower case member and the upper case member, and then the ultrasonic welding machine inserting and fusion bonding the plurality of heat dissipating units to have an insertion depth of 99% or less of the thickness of the case member at the same time; or
After disposing a plurality of heat dissipation units so that one end is inserted into a plurality of insertion holes formed on the outer surface of at least one of the lower case member and the upper case member and the other end is interviewed on the outer surface, an ultrasonic welding machine is used. A method for manufacturing a CFRP battery pack cabinet, comprising: inserting and fusing a plurality of heat dissipating units at the same time to have an insertion depth of 99% or less of the thickness of the case member.
9. The method of claim 8,
The method for manufacturing a CFRP battery pack cabinet further comprising the step of forming a potential difference corrosion prevention layer on the surfaces of the lower case member and the upper case member on which the heat dissipation part is formed.
The CFRP battery pack cabinet of any one of claims 1 to 6 or the CFRP battery pack cabinet manufactured by the manufacturing method of any one of claims 8 to 12; and
Electrical energy application products including; two or more battery packs installed inside the cabinet.
The CFRP battery pack cabinet of claim 7 or the CFRP battery pack cabinet manufactured by the manufacturing method of any one of claims 8-12 CFRP battery pack cabinet; and
Electrical energy application products including; two or more battery packs installed inside the cabinet.

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