KR20210017438A - Battery pack cabinet and preparation method therefor - Google Patents

Abstract

The present invention relates to a battery pack cabinet structure and, more specifically, to a battery pack cabinet and a manufacturing method therefor, wherein the battery pack cabinet has an improved structure so that heat dissipation performance is excellent even when the battery pack cabinet built in an electric or hybrid vehicle and having a large high voltage battery pack installed and stored therein is made of a high-strength polymer material such as reinforced plastic. To this end, the battery pack cabinet comprises a support case unit, a cover case unit, and a heat dissipation unit.

Description

Battery pack cabinet and its manufacturing method {BATTERY PACK CABINET AND PREPARATION METHOD THEREFOR}

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

Electric and hybrid vehicles generally use a battery pack containing a 300 volt or higher high voltage battery 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, unstructured casing and may include a cooling device to keep the battery in the desired operating range.

Even with high-power batteries that use advanced battery chemicals (such as lithium-ion batteries), the weight of the battery pack can be significant and constitute a significant part of the vehicle's weight. Increasing vehicle weight is the need for a cabinet consisting of a tray or similar support structure and a cover for fixing the battery pack to the vehicle. Of course, these cabinets must be adequately sturdy and stiff to accommodate dynamic loads that will occur during service in addition to static loads, and these structural cabinets must be compatible with adjacent chassis or body members of the vehicle.

In the meantime, battery pack cabinets were mainly made of steel or magnesium. In this case, there was no problem in heat dissipation of the heat source due to battery use, but relatively dense steel adds more vehicle weight than desired, and although magnesium has a low density, it is easy to corrode when exposed to aqueous environments and has limited ductility. There was a problem.

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

However, battery pack cabinets made of high-strength polymer materials such as reinforced plastics have lower thermal conductivity than steel (46W/mK) (2.0 to 3.0 W/mK in the surface direction and 1.0 W/mK in the thickness direction). there is a problem. In particular, heat dissipates well in the plane direction, but a problem is that the thermal conductivity is low in the thickness direction in which heat must escape.

Accordingly, there is a need to develop a technology capable of solving these problems and providing a more lightweight battery pack cabinet.

Korean Patent Registration No. 10-1939617

As a result of a number of research efforts, the present inventors have completed the present invention by developing a battery pack cabinet with a new structure that can solve the problems of a battery pack cabinet made of a high strength polymer material.

Therefore, the object of the present invention is to solve the problem of low thermal conductivity in the thickness direction of high-strength polymer materials such as reinforced plastics through simple structural changes, without reducing the thickness to a defective thickness or using only expensive heat dissipating polymers. It is possible to provide a battery pack cabinet with a new structure and a method of manufacturing the same, which can increase the performance and life of the battery pack built therein.

The object of the present invention is not limited to the above-mentioned object, and even if not explicitly mentioned, the object of the invention that one of ordinary skill in the art can recognize from the description of the detailed description of the invention to be described later may naturally 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 interior space having a predetermined volume is formed in an open upper portion and a lower connection formed integrally extending from both ends of the lower case member. A support case made of a high-strength polymer material including a member; An upper internal space having a certain volume with a size covering the upper part of the lower internal space formed by the lower case member is formed by extending integrally from both ends of the upper case member and the upper case member formed in an open lower part. 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 heat dissipation unit constituting a part of the lower case member and the upper case member, and dissipating heat generated in the interior space formed by the lower interior space and the upper interior space in the thickness direction. It provides a battery pack cabinet comprising; a heat dissipation unit made of a material.

In a preferred embodiment, when the heat dissipation unit includes two or more heat dissipation units in each of the lower case member and the upper case member to be spaced apart from each other, the lower case member or the upper case having the heat dissipation unit A certain area of the member forms a composite layer in which two or more layers of different materials are stacked in the thickness direction.

In a preferred embodiment, the composite layer is a heat dissipating unit layer formed of a material having high thermal conductivity constituting the heat dissipating unit, and the other layer surrounding the heat dissipating unit layer is the lower case. It is a member or a layer made of a high-strength polymer material constituting the upper case member.

In a preferred embodiment, when the heat dissipation unit is formed in a state in which two or more heat dissipation units are connected to each other in each of the lower case member and the upper case member, the heat dissipation unit is formed on one surface of the planar member and the planar member. It is composed of a protruding member that integrally protrudes to have a predetermined thickness and width vertically, the other surface of the planar member forms a part of the outer surface of the lower case member or the upper case member, and the surface of the protruding member is the lower Forming a part of the inner surface of the case member or the upper case member, the planar members are integrally formed or combined with each other to connect the two or more heat dissipating units.

In a preferred embodiment, when the heat dissipation unit forms a part of the outer surface of the lower case member or the upper case member, a protective coating part is further formed on the outer surface of the lower case member or the upper case member.

In a preferred embodiment, the material having high thermal conductivity constituting the heat dissipation part includes at least one of metal, ceramic, and heat dissipation polymer.

In a preferred embodiment, the heat dissipation units respectively formed on the lower case member and the upper case member are formed at positions opposite to each other.

In a preferred embodiment, the high-strength polymer material is a thermosetting fiber-reinforced composite material or a thermoplastic fiber-reinforced composite material produced by impregnating or prepregating reinforcing fiber in a resin used as a base material, wherein the reinforcing fiber is glass fiber, carbon fiber, Any one or more selected from the group consisting of aramid fiber, basalt fiber, and mixtures thereof, and the resin used as the base material is an epoxy resin, a phenolic resin, in the case of the thermosetting fiber-reinforced composite material, It is at least one selected from the group containing unsaturated polyester resin, vinyl ester, polyurethane, and mixtures thereof, and in the case of the thermoplastic fiber-reinforced composite material, polypropylene, polyethylene ), low density polyethylene, high density polyethylene, polyester, polystyrene, polyvinyl chloride, modified polyphenyleneoxide, polyamide6 (polyamide6), polyamide 610, polyamide 66, polyphenylene sulfide, ABS (acrylonitrile butadiene styrene), polycarbonate, polyurethane, polybutylene tere Phthalate (polybutylene terephthalate), poly acetal, polysulfone, polyarylsulfone, polyphenylsulfone, polyethersulfone, polyetheretherketone, polyamide Imide (polyamideimide), polyetherimide (polyetherimide), polytetrafluoroethylene (polytetrafluoroethylene, PTFE), and one or more selected from the group consisting of mixtures thereof.

In addition, the present invention is a thermoplastic fiber-reinforced composite material or a thermosetting fiber-reinforced composite material, the steps of preparing a support case portion and a cover case portion formed by spaced apart from each other at least two inserts into which the heat dissipation unit is inserted; Preparing a heat dissipation unit comprising a plurality of heat dissipation units to be inserted into a plurality of inserts respectively formed in the support case part and the cover case part; Forming a heat conduction promoting layer by applying heat dissipation grease to a plurality of inserts formed in the support case part and the cover case part; And inserting the heat dissipating unit on the heat conduction promoting layer formed in the inserting part to assemble the heat dissipating part to form a part of the support case part and the cover case part.

In addition, the present invention comprises the steps of preparing a heat dissipation unit formed in a state in which two or more heat dissipation units are connected to each other; Preparing at least one mold of the support case part and the cover case part; And inserting the heat dissipation part into the prepared mold and then insert-injecting using a thermoplastic fiber-reinforced composite material.

In addition, the present invention is any one of the above-described battery pack cabinet; And at least two battery packs installed inside the cabinet.

In a preferred embodiment, it is an electric vehicle or a hybrid vehicle.

According to the battery pack cabinet and its manufacturing method of the present invention described above, the problem of low thermal conductivity in the thickness direction of a high-strength polymer material such as reinforced plastic through a simple structural change is reduced to a thickness that is defective or expensive heat dissipation. Since it can be done without using only polymers, it can increase the performance and life of the battery pack built into it.

These technical effects of the present invention are not limited only to the ranges mentioned above, 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 specific details for the implementation of the invention described later are also Of course it is included.

1A is a real picture showing a state in which a battery pack is accommodated in a known battery pack cabinet made of a high strength polymer material, FIG. 1B is a real picture of a known battery pack cabinet made of a high strength polymer material, and FIG. 1C is a high strength polymer material It is a schematic cross-sectional view of a known battery pack cabinet consisting of.
2A and 2B are schematic cross-sectional and separated cross-sectional views showing the structure of a battery pack cabinet according to an embodiment of the present invention.
3A to 3C are schematic cross-sectional views, separating cross-sectional views, and cross-sectional views of a heat dissipation unit showing the structure of a battery pack cabinet according to another embodiment of the present invention.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the existence of features, numbers, steps, actions, elements, parts, or a combination thereof described in the description of the invention, but one or more other It is to be understood that it does not preclude the presence or addition of features, numbers, steps, actions, components, parts, or combinations thereof.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another component. 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 be referred to as a first component.

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

In interpreting the constituent elements, it is interpreted as including an error range even if there is no explicit description. In particular, when the terms "about", "substantially" and the like of degree are used, it can be interpreted as being used in or close to that value when manufacturing and material tolerances specific to the stated meaning are presented. .

In the case of a description of a temporal relationship, for example,'after','following','after','before', etc. It includes cases that are not continuous unless' is used.

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. The same reference numerals used to describe the present invention throughout the specification denote the same elements.

The technical feature of the present invention is that the problem of low thermal conductivity in the thickness direction of a high-strength polymer material such as reinforced plastic is reduced to a defective thickness when manufacturing, or has a modified structure so that it can be solved without using only an expensive heat dissipating polymer It's in the battery pack cabinet.

That is, in the case of a conventionally known electric vehicle battery cabinet, there is no problem of heat dissipation due to the use of the battery when it is made of steel (or magnesium), but carbon fiber reinforced plastic (Thermo, Thermoset) for the purpose of weight reduction. The battery cabinet manufactured using plastic, CFR(T)P) material has a characteristic that CFRP has lower thermal conductivity (2.0~3.0W/mK in surface direction and 1.0W/mK in thickness direction) compared to steel (46W/mK). This is because there was a problem of excessive temperature rise due to heat generation. Particularly, the thermal conductivity is high in the plane direction, but the thermal conductivity is low in the thickness direction in which heat must escape is a problem.

Accordingly, in order to solve the problem of low thermal conductivity in the thickness direction of the high-strength polymer material, the battery pack cabinet of the present invention includes a lower case member and the lower case in which a lower interior space having a certain volume is formed in an open upper portion. A support case portion made of a high-strength polymer material including lower connecting members formed integrally from both ends of the member; An upper internal space having a certain volume to cover the upper part of the lower internal space formed by the lower case member is formed integrally extending from both ends of the upper case member and the upper case member having an open lower part, A cover case portion made of a high-strength polymer material including an upper connecting member formed to cover the lower connecting member; And at least one heat dissipation unit constituting a part of the lower case member and the upper case member, and dissipating heat generated in the interior space formed by the lower interior space and the upper interior space in the thickness direction. It has a structure including; a heat dissipation unit composed of a material. Here, the high-strength polymer material may be a thermosetting fiber-reinforced composite material or a thermoplastic fiber-reinforced composite material produced by impregnating or prepregating a reinforcing material fiber in a thermosetting resin or thermoplastic resin used as a base material.

As described above, the battery pack cabinet of the present invention has been solved through a structural change in which the structure in the thickness direction is partially changed to a material having high thermal conductivity in order to increase the thermal conductivity in the thickness direction in which heat must escape.

2A and 2B are schematic cross-sectional and separated cross-sectional views showing the structure of a battery pack cabinet according to an embodiment of the present invention, and FIGS. 3A to 3C are schematic views showing the structure of a battery pack cabinet according to another embodiment of the present invention. It is a cross-sectional view, a separate cross-sectional view, and a cross-sectional view of a heat dissipation part.

First, a structure according to the first embodiment of the battery pack cabinet of the present invention will be described in detail with reference to FIGS. 2A and 2B.

As shown in FIG. 2A, the battery pack cabinet 100 according to the first embodiment includes a support case part 110, a cover case part 120, a heat dissipation part 130, and a case fixing part 140. If necessary, a heat conduction promoting layer 150 may be further included.

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 FIG. 2B.

The lower case member 111 has a lower interior space 113 having a certain volume in an open shape, and a plurality of insertion portions 111a for forming the heat dissipation unit 130 are provided with the battery pack 200. It may be formed to be located under the installed battery pack 200 corresponding to the position to be disposed. The insertion part 111a is a part in which the heat dissipation unit 131 constituting the heat dissipation part 130 is formed, and may be formed by removing some of the thickness of the lower case member 111 from the surface adjacent to the lower interior space 113. have. In particular, the structure of the insertion part 111a is that after the heat dissipation unit 131 is inserted into the insertion part 111a, the heat dissipation unit 131 is exposed to the lower internal space 113 as much as possible, but does not escape to the lower internal space 113. As long as it is a structure, all known structures may be adopted, and as an embodiment, it may have a structure in which locking projections are formed at both side ends of the heat dissipation unit 131 as shown. Through this structure of the insertion part 111a, the heat dissipation unit 131 can be inserted and fixed to the lower case member 111 without a separate fixing tool, so that cost reduction effect can be obtained. In addition, since it is not fixed by screws or bolts, it is possible to solve corrosion and instability of fastening depending on usage time. Although not shown, when a rib is formed in the same structure as the rib 121b formed in the upper case member 120 forming the cover case portion 120 in FIG. 2B, the strength and rigidity of the support case portion 110 are reinforced and durability Can improve.

The lower connection member 112 is formed integrally extending from both ends of the lower case member 111, particularly at both ends in the longitudinal direction, and may have a long and narrow plate-shaped structure extending parallel to the ground as shown in one embodiment. In addition, although not shown, a plurality of through holes through which the case fixing part 140 passes may be spaced apart from each other to have a structure. In this case, the inner wall of the through hole is formed with a thread, so that the coupling structure between the support case unit 110 and the cover case unit 120 may be made firm by the case fixing unit 140.

The cover case portion 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 FIG. 2B.

The upper case member 121 has a size covering the upper part of the lower internal space 113 formed by the lower case member 111, and the upper internal space 123 having a certain volume is formed in an open lower part, and heat dissipation The insertion portion 121a for forming the portion 130 may be formed to correspond to a position where the battery pack is to be disposed, that is, to be positioned above the installed battery pack 200. The insertion part 121a is a part where the heat dissipation unit 131 constituting the heat dissipation part 130 is formed, and may be formed by removing a part of the thickness of the upper case member 121 from the surface adjacent to the upper interior space 123 have. In particular, the structure of the insertion part 121a is that after the heat dissipation unit 131 is inserted into the insertion part 121a, the heat dissipation unit 131 is exposed to the upper internal space 123 as much as possible, but does not escape into the upper internal space 123. All known structures may be adopted as long as the structure is not a structure, and as an embodiment, it may have a structure in which locking projections are formed at both side ends of the heat dissipation unit 131 as shown. Through such an insertion part 121a structure, the heat dissipation unit 131 can be inserted and fixed to the upper case member 121 without a separate fixing tool, thereby reducing cost. In addition, since it is not fixed by screws or bolts, it is possible to solve corrosion and instability of fastening depending on usage time. In addition, as shown in FIG. 2B, since the insertion portion 121a is formed by removing the thickness of the upper case member 121, there is a possibility that the rigidity of the upper case member 121 may be weakened in the region where the insertion portion 121a is formed. If a plurality of stiffening ribs 121b are formed as shown in the region where the insertion portion 121a is formed, the strength and rigidity of the cover case portion 120 as a whole may be strengthened to improve durability.

The upper connection member 122 is formed to be integrally extended from both ends of the upper case member 121, particularly at both ends in the longitudinal direction, and may be a long and narrow plate-shaped structure extending parallel to the ground as shown as an embodiment. In addition, although not shown, a plurality of through holes through which the case fixing part 140 passes may be spaced apart from each other to have a structure. In this case, the inner wall of the through hole is formed with a thread, so that the coupling structure between the support case unit 110 and the cover case unit 120 may be made firm by the case fixing unit 140.

2A and 2B, the support case unit 110 and the cover case unit 120 are disposed to face each other and may be formed to 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 heat dissipation efficiency, as well as 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 unit 110 and the cover case unit 120 are combined with each other, the lower interior space 113 and the upper interior space 123 form one closed space and the heat dissipation unit 130 is disposed. It goes without saying that it may be deformed and formed to have different sizes. Also at this time, when the heat dissipation units 131 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 improved.

The high-strength polymer material constituting the support case portion 110 and the cover case portion 120 may be a reinforced plastic manufactured by using at least one of carbon fibers and glass fibers in known thermoplastic resins and thermosetting resins. As a polyphenylene sulfide (PPS), epoxy, polypropylene (PP), polyethylene (PE), polyamide (PA) selected from the group consisting of any one of the thermosetting plastic or thermoplastic is glass fiber or pitch-based carbon fiber , Polyacrylic carbon fiber, pitch-based carbon fiber chop, may be a reinforced plastic produced by impregnating or prepregating any one selected from the group consisting of a pitch-based milled fiber.

The heat dissipation unit 130 constitutes a part of the lower case member 111 and the upper case member 121, and transmits heat generated in the internal space formed by the lower internal space 113 and the upper internal space 123 in the thickness direction. As a component for radiating heat, it includes at least one heat radiating unit 131.

In particular, as shown in Figs. 2A and 2B, the heat dissipation unit 130 is formed in a state in which at least two heat dissipation units 131 are spaced apart from each other in the lower case member 111 and the upper case member 121, respectively. When included, a predetermined area of the lower case member 111 or the upper case member 121 in which the heat dissipation unit 131 is formed forms a composite layer in which two or more layers of different materials are stacked in the thickness direction. In particular, the composite layer is a heat dissipation unit layer composed of a material having high thermal conductivity that constitutes the heat dissipation unit 131, and the layer formed on the side of the interior space, that is, the lower interior space 113 and the upper interior space 123 is interviewed. Another layer surrounding the layer may be composed of a layer made of a high strength polymer material forming the lower case member 111 or the upper case member 121.

In this way, the heat dissipation unit 131 is inserted into the insertion portion 111a/121a formed by removing some of the thickness of the lower case member 111 and the upper case member 121 as shown in FIGS. 2A and 2B to Since the member 111 and the upper case member 121 form part of the thickness to form a composite layer as a whole, it has a size and shape that can be inserted and maintained in the insertion part 111a/121a and is composed of a material having high thermal conductivity. It may be a plate member. Here, the material having high thermal conductivity may include at least one of metal, ceramic, and heat dissipating polymer. In particular, the metal is not limited as long as it is a lightweight metal with high thermal conductivity, but as an embodiment, in the group consisting of aluminum, copper, gold, iron, carbon steel, lead, nickel, silver, stainless steel, SUS, titanium, and alloys thereof. It may be any one to be selected, and in consideration of thermal conductivity and cost, it may be copper, aluminum, and alloys thereof.

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

The heat conduction promoting layer 150 is formed on the inner wall of the insertion portion 111a/121a formed by removing a portion of the thickness of the lower case member 111 and the upper case member 121, so that the heat dissipation unit 131 and the lower case member 111 ) Or by completely contacting the upper case member 121 so that no air layer is formed therebetween, thereby facilitating or assisting the heat generated by the battery pack 200 to pass through the heat dissipation unit 131 and dissipate it to the outside. Function can be performed. The heat conduction promotion layer 150 may be formed of a heat radiation grease layer formed by applying heat radiation grease.

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

As shown in FIG. 3A, the battery pack cabinet 100 according to the second embodiment includes a support case unit 110, a cover case unit 120, a heat dissipation unit 130, and a case fixing unit 140. If necessary, a protective coating layer 160 may be further included.

Accordingly, the structure of the battery pack cabinet according to the second embodiment is configured in a state in which the heat dissipation units 131 included in the heat dissipation unit 130 are separated from each other compared to the structure of the battery pack cabinet according to the first embodiment described above. 3C, only the structure of the heat dissipation part 130 is changed, but due to the difference in the structure of the heat dissipation part 130, the lower case member 111 and the cover case part 120 of the support case part 110 ) In the upper case member 121 of the insertion portion (111a / 121a) instead of the through portion (111b / 121c) is formed and the heat conduction promoting layer (150) instead of the protective coating layer 160 is formed only different Since the configuration is the same, only different technical configurations will be described.

The support case unit 110 includes a lower case member 111 and a lower connection member 112 as shown in FIG. 3B. In particular, the lower case member 111 has a lower internal space 113 having a certain volume. The upper portion is formed in an open shape, and a plurality of through portions 111b for forming the heat dissipation portion 130 correspond to the position where the battery pack 200 is to be disposed, that is, to be located under the installed battery pack 200. Can be formed. A plurality of through portions 111b are formed by being spaced apart from the bottom surface forming the lower surface of the lower interior space 113 of the lower case member 111, and each through portion 111b is a heat dissipating unit forming a radiating portion 130 It may be formed to be filled with 131.

The cover case unit 120 also includes an upper case member 121 and an upper connection member 122 as shown in FIG. 3B in the same structure as the support case unit 110, wherein the upper case member 121 is The upper internal space 123 having a certain volume with a size covering the upper part of the lower internal space 113 formed by the case member 111 is formed in an open lower part, and to form the heat dissipation part 130 A plurality of through portions 121c may be formed to correspond to a position where the battery pack 200 is to be disposed, that is, to be positioned above the installed battery pack 200. A plurality of through portions 121c are formed to be spaced apart from the upper surface forming the upper surface of the upper interior space 123 of the upper case member 121, and each through portion 121c is a heat dissipation unit forming a heat dissipation unit 130 It may be formed to be filled with 131.

In this case, as shown in FIG. 3B, when the heat dissipation unit 130 has a structure including two or more heat dissipation units 131 connected, the lower surface of the lower interior space 113 of the lower case member 111 The outer surface of the bottom surface and the outer surface of the upper surface forming the upper interior space 123 of the upper case member 121 may be formed in a state that is removed by the thickness of the planar member 131a. The shape and size of the through portion 111b are not limited, but may take the same shape as the lower surface of the battery or a shape that is easy to manufacture.

The heat dissipation unit 130 is a component that radiates heat generated in the interior space formed of the lower interior space 113 and the upper interior space 123 in the thickness direction, similar to the battery pack cabinet of the first embodiment, When the structure of 130) is included in the lower case member 111 and the upper case member 121 in a state in which two or more heat dissipation units 131 are connected to each other, as shown in FIG. 3C as an embodiment Each heat dissipation unit 131 is composed of a planar member 131a and a protruding member 131b integrally protruding from one surface of the planar member 131a to have a predetermined thickness and width vertically, and each radiating unit 131 The planar members 131a of may have a structure in which two or more heat dissipating units 131 are connected by being integrally formed or combined with each other.

In particular, a plurality of heat dissipation units 131 included in the heat dissipation unit 130 having a structure as shown in FIG. 3C are formed on the bottom surface of the lower case member 111 and the upper surface of the upper case member 121 respectively. When arranged to be filled in the spheres 111b/121c, the heat dissipation unit 130 may be implemented to form a part of the bottom surface of the lower case member 111 and the upper surface of the upper case member 121 as shown in FIG. 3A. I can. In this case, the other surface of the planar member 131a of the heat dissipation unit 131, that is, the surface on which the protruding member 131b is not formed forms part of the outer surface of the lower case member 111 or the upper case member 121 and protrudes. The surface of the member 131b, in particular, a surface at a position opposite to the planar member 131a may form a part of the inner surface of the lower case member 111 or the upper case member 121.

In this way, when the heat dissipation unit 130 is implemented to form a part of the outer surface or the inner surface of the lower case member 111 or the upper case member 121, the heat generated from the battery pack is transferred to the outside of the battery pack cabinet in the internal space. Since it is easy to dissipate into, unlike the first embodiment, the heat conduction promoting layer 150 is not required at all. However, when the heat dissipation part 130 is made of a metal material, the protective coating layer 160 may need to be formed to block contact with moisture in order to prevent potential difference corrosion.

The protective coating layer 160 is not limited as long as it is a coating layer capable of blocking contact with moisture without interfering with heat conduction, but may be a paint coating layer or an adhesive protective film layer as an embodiment.

Next, as an embodiment of the manufacturing method of the battery pack cabinet having the structure according to the first embodiment described above, the support case portion 110 and the cover case portion 120 have the same size and shape, and the thermoplastic fiber-reinforced composite Look at the case of using the material. Here, the thermoplastic fiber-reinforced composite material may be any known thermoplastic fiber-reinforced composite material.As an embodiment, the fiber used as the reinforcing material is composed of glass fiber, carbon fiber, aramid fiber, and basalt fiber alone or in combination of two or more. The resin used as the base material may be polypropylene, polyethylene, low density polyethylene, high density polyethylene, polyester, polystyrene, and poly(polystyrene). Polyvinyl chloride, modified polyphenyleneoxide, polyamide6, polyamide610, polyamide66, polyphenylene sulfide, ABS (acrylonitrile) butadiene styrene), polycarbonate, polyurethane, polybutylene terephthalate, poly acetal, polysulfone, polyarylsulfone, polyphenylsulfone Thermoplastic resins represented by polyphenylsulfone), polyethersulfone, polyetheretherketone, polyamideimide, polyetherimide, and polytetrafluoroethylene (PTFE) can be used. .

First, the support case unit 110 and the cover case unit 120 having the structure shown in FIG. 2B have two or more inserts 111a/121a into which the heat dissipation unit 131 can be inserted. You can easily prepare a mold by injection molding.

Thereafter, a plurality of heat dissipation units 131 having a size that can be inserted and held in the support case unit 110 and the insertion unit 111a/121a formed in the cover case unit 120 are prepared to prepare the heat dissipation unit 130 Configurable. As described above, the heat dissipation unit 131 may be a plate-shaped member, and the heat dissipation unit 131 may be manufactured by a known method according to the material of the heat dissipation unit 131. As an embodiment, in the case of metal, it is possible to manufacture by casting or milling, and a plate-shaped metal having a certain thickness may be cut to a required certain length and used.

In this way, when the support case unit 110, the cover case unit 120, and the heat dissipation unit 130 composed of a plurality of heat dissipation units 131 are prepared, the insertion unit of the support case unit 110 and the cover case unit 120 ( Before inserting and retaining the heat dissipation unit 131 in 111a/121a), the heat conduction promoting layer 150 may be formed by applying heat dissipation grease to the surface of the inserting portion 111a/121a.

After the heat conduction promoting layer 150 is formed on the insertion portions 111a/121a of the support case 110 and the cover case 120, the heat dissipation unit 131 is inserted into the insertion portions 111a/121a to The 130 may be assembled to form a part of the support case unit 110 and the cover case unit 120. When the heat dissipation part 130 is formed to form a part of the support case part 110 and the cover case part 120 in this way, the heat dissipation unit 131 and the support case part 110 held in the insertion part 111a/121a Since an air layer is not formed between the lower case member 111 of the upper case member 111 or the upper case member 121 of the cover case part 120, the thermal conduction performance may be promoted.

Thereafter, when the support case portion 110 on which the radiating portion 130 is formed is covered with the cover case portion 120 on which the radiating portion 130 is formed and fixed with the case fixing portion 140, the battery pack cabinet 100 is completed. can do.

Although not described in detail, as another embodiment of the manufacturing method of the battery pack cabinet having the structure according to the first embodiment described above, the material of the support case unit 110 and the cover case unit 120 is a thermosetting fiber-reinforced composite material. In this case, the support case unit 110 and the cover case unit 120 are subjected to resin transfer molding, vacuum assisted resin transfer molding, press compression molding, etc. Since only the preparation point is different, the rest of the method is the same, so a detailed description is omitted. Here, the thermosetting fiber-reinforced composite material may be any known thermosetting fiber-reinforced composite material.As an embodiment, the fiber used as the reinforcing material is composed of glass fiber, carbon fiber, aramid fiber, basalt fiber alone or in combination of two or more. The resin used as the base material may be a thermosetting resin typified by epoxy resin, phenolic resin, unsaturated polyester resin, vinyl ester, and polyurethane. In particular, the fiber used as the reinforcing material is composed of a mixture of glass fiber and carbon fiber, and a composite material manufactured using an epoxy resin as a base material may be used.

Next, as an embodiment of a method for manufacturing a battery pack cabinet having a structure according to the second embodiment described above, the support case portion 110 and the cover case portion 120 have the same size and shape, and reinforced thermoplastic fiber. Consider the case of using composite materials.

First, the heat dissipation unit 130 formed in a state in which two or more heat dissipation units 131 are connected to each other to have a structure as shown in FIG. 3C may be formed of, for example, metal or Graphite materials can be prepared by milling or casting, and ceramic materials are prepared by firing, sintering, and processing through tape molding, CIP molding, extrusion molding, and GEL molding.

After that, a mold having an overall shape of any one of the support case portion and the cover case portion is prepared.

After inserting the heat dissipation unit 130 having a structure in which two or more heat dissipation units 131 are connected to the prepared mold, the remaining part is filled with a thermoplastic fiber-reinforced composite material, and then insert injection, the support case part where the heat dissipation unit 130 is formed. (110) and the cover case portion 120 can be easily obtained.

Thereafter, when the support case portion 110 on which the radiating portion 130 is formed is covered with the cover case portion 120 on which the radiating portion 130 is formed and fixed with the case fixing portion 140, the battery pack cabinet 100 is completed. can do.

Although not specifically described, as another embodiment of the manufacturing method of the battery pack cabinet having the structure according to the second embodiment described above, the material of the support case portion 110 and the cover case portion 120 is a thermosetting fiber-reinforced composite material. In this case, it can be manufactured using resin transfer molding or vacuum assisted resin transfer molding, extrusion, injection, or press.

In this way, when the battery pack cabinet 100 according to the first and/or second embodiment is prepared, the battery pack 200 is disposed on the support case unit 110 in which the heat dissipation unit 130 is formed, and then radiates heat. By covering the cover case part 120 on which the part 130 is formed and fixing it with the case fixing part 140, an electric energy application product with a built-in battery pack 200 as shown in FIGS. 2A and/or 3A can be prepared. I can. As an example of an electric energy application product including such a battery pack cabinet, an electric vehicle or a hybrid vehicle may be representative.

Experimental example

In order to measure the heat dissipation performance, a battery pack cabinet made of a carbon fiber reinforced fiber material with a built-in battery pack having the structure shown in FIG. 1B installed in a conventional electric vehicle or hybrid vehicle as a control, and the first embodiment of the present invention. After using the battery pack cabinet having the structure according to the same conditions as the control group, the temperature of each part was measured according to the operating time after the battery operation in the position as shown in FIG. 1C, and the results are shown in Table 1 below. The internal air temperature (T1) around the battery was measured using a k-type thermocouple, and the outer surface temperature (T2) of the case directly above the battery and the external surface temperature (T3) of the case where the battery is not located were measured.

Example 1 (℃) Control (℃) Uptime T1 T2 T3 T1 T2 T3 0h 20 20 20 20 20 20 0.5h 30 29 28 31 27 25 1h 32 31 29 38 31 28 2h 33 32 31 40 33 29 4h 33 32 31 41 35 32

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

In this way, even if the battery pack cabinet is made of a 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 battery pack cabinet made of carbon fiber reinforced fiber material, thus enabling wide application in various industrial fields. will be.

Although the present invention has been illustrated and described with a preferred embodiment as described above, it is not limited to the above-described embodiment, and within the scope of the spirit of the present invention, those of ordinary skill in the art Various changes and modifications will be possible.

100: battery pack cabinet 110: support case portion
111: lower case member 112: lower connecting member
113: lower interior space 120: cover case part
121: upper case member 122: upper connecting member
123: upper interior space 130: radiating part
131: heat dissipation unit 131a: plane member
131b: protruding member 140: case fixing portion
150: heat conduction promoting layer 160: protective coating layer
200: battery pack

Claims (12)

A support case portion made of a high-strength polymer material including a lower case member in which a lower interior space having a predetermined volume is formed in an open upper portion, and a lower connection member formed integrally from both ends of the lower case member;
An upper internal space having a certain volume with a size covering the upper part of the lower internal space formed by the lower case member is formed by extending integrally from both ends of the upper case member and the upper case member formed in an open lower part. A cover case portion made of a high-strength polymer material including an upper connecting member formed to cover the lower connecting member; And
High thermal conductivity material comprising at least one heat dissipation unit constituting a part of the lower case member and the upper case member, and radiating heat generated in the interior space formed as the lower interior space and the upper interior space in the thickness direction A battery pack cabinet comprising; a heat dissipation unit consisting of.
The method of claim 1,
When the heat dissipation unit includes two or more heat dissipation units in each of the lower case member and the upper case member to be spaced apart from each other, a predetermined region of the lower case member or the upper case member on which the heat dissipation unit is formed is 2 A battery pack cabinet, characterized in that at least two layers of different materials form a composite layer stacked in a thickness direction.
The method of claim 2,
The composite layer is a heat dissipation unit layer formed of a material having high thermal conductivity constituting the heat dissipation unit, and the other layer surrounding the heat dissipation unit layer is the lower case member or the upper case member. A battery pack cabinet, characterized in that it is a layer made of a high-strength polymer material forming a.
The method of claim 1,
When the heat dissipation unit is formed in a state in which two or more heat dissipation units are connected to each other in each of the lower case member and the upper case member, the heat dissipation unit has a predetermined thickness and width perpendicular to one surface of the planar member and the planar member. It is composed of a protruding member integrally protruding so as to have, the other surface of the planar member forms a part of the outer surface of the lower case member or the upper case member, and the surface of the protruding member is the lower case member or the upper case A battery pack cabinet, wherein the two or more heat dissipating units form a part of the inner surface of the member, and the planar members are integrally formed or coupled to each other.
The method of claim 4,
When the heat dissipation unit forms a part of the outer surface of the lower case member or the upper case member, a protective coating part is further formed on the outer surface of the lower case member or the upper case member.
The method according to any one of claims 1 to 5,
The material having high thermal conductivity constituting the heat dissipation unit includes at least one of metal, ceramic, and heat dissipation polymer.
The method according to any one of claims 1 to 5,
The heat dissipation units formed on the lower case member and the upper case member, respectively, are formed at positions opposite to each other.
The method according to any one of claims 1 to 5,
The high-strength polymer material is a thermosetting fiber-reinforced composite material or a thermoplastic fiber-reinforced composite material produced by impregnating or prepregating reinforcing fibers 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 an epoxy resin, a phenolic resin, an unsaturated polyester resin, vinyl ester, polyurethane, and mixtures thereof in the case of the thermosetting fiber-reinforced composite Any one or more selected from the group containing, and
In the case of the thermoplastic fiber-reinforced composite material, polypropylene, polyethylene, low density polyethylene, high density polyethylene, polyester, polystyrene, polyvinyl chloride (polyvinyl chloride), modified polyphenyleneoxide, polyamide6, polyamide610, polyamide66, polyphenylene sulfide, ABS (acrylonitrile butadiene styrene) ), polycarbonate, polyurethane, polybutylene terephthalate, poly acetal, polysulfone, polyarylsulfone, polyphenylsulfone , Polyethersulfone, polyetheretherketone, polyamideimide, polyetherimide, polytetrafluoroethylene (PTFE), and mixtures thereof. Battery pack cabinet, characterized in that at least one.
Preparing a support case portion and a cover case portion formed of a thermoplastic fiber-reinforced composite material or a thermosetting fiber-reinforced composite material with two or more inserts into which the heat dissipation unit can be inserted;
Preparing a heat dissipation unit comprising a plurality of heat dissipation units to be inserted into a plurality of inserts respectively formed in the support case part and the cover case part;
Forming a heat conduction promoting layer by applying heat radiation grease to a plurality of inserts formed in the support case part and the cover case part; And
And assembling the heat dissipation unit to form a part of the support case part and the cover case part by inserting the heat dissipation unit on the heat conduction promoting layer formed in the insertion part.
Preparing a heat radiation unit formed in a state in which two or more heat radiation units are connected to each other;
Preparing at least one mold of the support case part and the cover case part; And
A method for manufacturing a battery pack cabinet comprising: inserting the heat dissipation part into the prepared mold and then insert-injecting using a thermoplastic fiber-reinforced composite material.
The battery pack cabinet according to any one of claims 1 to 5; And
Electric energy application product including; two or more battery packs installed inside the cabinet.
The method of claim 11,
Electric energy application product, characterized in that the electric vehicle or hybrid vehicle.

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