KR102059611B1 - Battery Pack for Unmanned Aerial Vehicle and Unmanned Aerial Vehicle Including the Same - Google Patents

Abstract

The present invention provides a cell assembly comprising two or more battery cells; A cover member surrounding at least a portion of an outer surface of the cell assembly; At least one connector member electrically connected to the cell assembly and connected to the device in a state led outwardly through a cover member; And a fluid guide member formed on an outer surface of the cover member and including two or more flow paths formed in a hollow structure to allow liquid fluid to flow therein. do.

Description

Battery pack for unmanned aerial vehicle and unmanned aerial vehicle including same {Battery Pack for Unmanned Aerial Vehicle and Unmanned Aerial Vehicle Including the Same}

The present invention relates to a battery pack for an unmanned aerial vehicle and an unmanned aerial vehicle including the same.

Recently, the increase in the price of energy sources due to the depletion of fossil fuels, interest in environmental pollution is amplified, and the demand for environmentally friendly alternative energy sources has become an indispensable factor for future life. Accordingly, researches on various power production technologies such as nuclear power, solar energy, wind power, tidal power, etc. continue, and power storage devices for more efficient use of the generated energy are also drawing attention.

In particular, as technology development and demand for wireless electronic products increase, demand for lithium secondary battery cells having high capacity and high output characteristics as energy sources is rapidly increasing.

Recently, the use of secondary battery cells has been realized as a power source for medium and large devices such as unmanned aerial vehicles, electric vehicles (EVs), and hybrid electric vehicles (HEVs) that require high power. There is an increasing need for unmanned aerial vehicles capable of specific tasks.

Unmanned aerial vehicles can be used for aerial imaging and aerial photography in difficult-to-access disaster / disaster areas, as well as for widespread application of extinguishing agents or pesticides at fire or agricultural sites.

These unmanned vehicles should be constructed as lightweight as possible for long-term operation and flight stability. Circuits and battery systems are generally built into thin, lightweight metal or plastic housings, and are mounted on arms and arms extending from all sides of the housing. It is composed of a structure driven by a propeller.

On the other hand, the lithium secondary battery cell generates a large amount of heat in the charging and discharging process, if the heat of the unit cell generated in the charging and discharging process is not effectively removed, heat accumulation occurs, resulting in deterioration of the battery cell.

In particular, a battery pack composed of a plurality of secondary battery cells for a long time operation and high output of the unmanned aerial vehicle requires a cooling system for cooling the battery cells embedded therein, and a liquid fluid to cool the battery cells in a short time. The cooling technology used has attracted attention.

However, since the unmanned air vehicle is strongly required to be lightweight as described above, it is difficult to introduce a separate cooling system for cooling the battery pack, and to cool each of the battery cells included in the battery pack, the refrigerant passage and the same. Since a plurality of connecting members are required to connect, there are problems such as complexity of the battery pack manufacturing process and increased parts management costs.

Therefore, while the weight of the unmanned aerial vehicle can be reduced, there is a high need for a battery pack having a structure capable of cooling and an unmanned aerial vehicle including the same.

The present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

Specifically, an object of the present invention is to provide a technology capable of cooling the battery pack by leading the liquid fluid to the outer surface of the battery pack in an unmanned aerial vehicle that spreads the liquid fluid to the outside.

A battery pack according to the present invention for achieving the above object is a battery pack mounted on a device for spraying a liquid fluid (outside) to the outside to supply power,

A cell assembly comprising two or more battery cells;

A cover member surrounding at least a portion of an outer surface of the cell assembly;

At least one connector member electrically connected to the cell assembly and connected to the device in a state led outwardly through a cover member; And

A fluid guide member formed on an outer surface of the cover member and including two or more flow paths having a hollow structure to allow liquid fluid to flow therein;

Including;

The fluid guide member is configured to receive the liquid fluid to be sprayed to the outside and guide it to the outer surface of the cover member, so that the liquid fluid is discharged to the outside through the battery pack immediately after cooling.

That is, the battery pack according to the present invention, instead of having a liquid fluid for cooling, cooling is performed using a liquid fluid sprayed from the device to the outside, it is necessary to provide a refrigerant and a cooling system for circulation of the refrigerant It is relatively light weight, but consists of a structure that can remove the heat of the battery pack.

Such a device may be, for example, the body of an unmanned aerial vehicle, and the liquid fluid sprayed by the unmanned aerial vehicle may be one selected from fire extinguishing agents, pesticides, and pesticides.

The unmanned aerial vehicle spraying such liquid fluids can be used to control forests or farmland with a large area, and can shorten the work time compared to manual work by manpower by spraying liquid fluids such as insecticides or pesticides in the air. Can be maximized.

In addition, the unmanned aerial vehicle may be used for extinguishing fire in difficult-to-access areas such as wildfires or high-rise buildings with a wide range of fires, and greatly improves fire safety by spraying liquid fluids such as extinguishing fluids and extinguishing agents from the air. Can be improved.

The battery pack according to the present invention is built to supply power to the device, and when the device performs operations such as control or extinguishing, the pesticide, insecticide or extinguishing agent is guided to the fluid guide member and cooled by heat exchange with these liquid phases. Consisting of a structure, a specific structure of the fluid guide member will be described below.

In one specific example, the fluid guide member may include: a first flow path portion connected to a liquid tank of a device for storing liquid fluid and including two or more flow paths for receiving and directing the liquid fluid from the liquid tank; And

A second flow path part including two or more flow paths in communication with the first flow path part, and having a spray nozzle formed therein;

Including;

The liquid fluid may perform heat exchange with the outer surface of the cover member while flowing from the liquid tank to the second flow path through the first flow path.

The liquid tank may be located at an upper end portion of the battery pack in a device, and the first flow path part may include a manifold connected to the liquid tank at an upper portion of the battery pack and in close contact with an upper surface of the cover member;

At least one first flow passage extending from one side of the manifold and connected to a portion of the second flow passage portion in close contact with a portion of the first side surface which is a side surface of the cover member; And

And at least one second flow passage extending from the other side of the manifold and connected to a portion of the second flow passage portion in close contact with a portion of the second side surface facing the first side surface.

The first flow path part is in close contact with the upper part of the battery cell, that is, the cover member, that is, the upper surface of the battery pack, the upper surface of the battery pack can be cooled by the liquid fluid flowing through the manifold.

The first flow path part may also be in close contact with both sides of the first flow path and the second flow path, and both sides of the battery pack may be cooled by the liquid fluid flowing in these flow paths.

The second flow path part may include: a third flow path communicating with the first flow path and in close contact with the first side surface except for the first flow path;

A fourth flow passage communicating with the second flow passage and in close contact with the second side surface except for the second flow passage; And

An injection nozzle in close contact with a lower surface of the cover member in a state in which the third flow path and the fourth flow path are connected to each other;

Including,

The injection nozzle is configured to be open and closed, and may be configured to inject the liquid fluid received from the third and fourth flow paths to the outside and to suppress the injection of the liquid fluid when the injection nozzles are closed.

That is, in the battery pack of the present invention, when the liquid tank is opened and the liquid fluid is in the flowable state, the liquid fluid flows from the first flow path part to the second flow path part while performing heat exchange with the battery pack. Sprayed to the outside through the injection nozzle, even if the injection nozzle is closed, the liquid fluid does not circulate back to the liquid tank, there is no need for a pump for the circulation of the liquid fluid or a condenser for heat removal of the fluid.

Since the cooling method does not require a separate refrigerant for cooling and does not require a system for circulating and cooling the fluid, the battery pack can be configured more compactly, and the liquid fluid is heated while flowing through the flow path, thereby providing high pressure. As it can be sprayed to the outside through the spray nozzle in the state of the spraying area and the spraying speed of the liquid fluid can also be maximized.

The second flow path part is in close contact with both sides of the cover member with the third flow path and the fourth flow path connected to the first flow path and the second flow path, respectively, so that both sides of the battery pack flow inside the flow paths. It can be cooled by a liquid fluid.

The second flow path part may also be in close contact with the lower surface of the cover member, so that the lower surface of the battery pack may be cooled by a liquid fluid immediately before being sprayed through the spray nozzle.

When the liquid tank is opened, the liquid fluid may flow from the first flow path part to the second flow path part by gravity and / or a difference in the liquid fluid hydraulic pressure in the first flow path part and the second flow path part.

Here, the liquid fluid in the liquid tank may be in a high pressure state, and the first flow path part exists in a higher pressure state than the second flow path part while flowing to the first flow path part immediately after opening, and thereafter, from the first flow path part to the second flow path. Negative gravity can cause the liquid fluid to flow. Gravity and hydraulic pressure of the fluid pressurizes the liquid fluid from the first flow path part to the second flow path part, and in the second flow path part, the liquid fluid may be sprayed through the injection nozzle under high pressure.

In addition, the battery pack of the present invention is configured such that the liquid fluid flows at a faster flow rate in the second flow passage portion than in the first flow passage portion.

This means that the initial liquid fluid flowing out of the liquid tank is relatively low in temperature, and in this state, after the heat exchange with the first flow path part, if the second liquid flow part enters into the second flow path part, the heat exchange of the second flow path part is performed by the relatively high temperature liquid fluid. In order to prevent the efficiency of the reduction, the liquid fluid heated from the first flow path portion may pass through the second flow path portion more quickly, thereby minimizing the temperature variation of the liquid fluid between the first flow path portion and the second flow path portion, As a result, the difference in heat exchange efficiency between the first flow path part and the second flow path part can be minimized.

In one specific example, the flow path included in the second flow path portion may have a structure in which the internal cross-sectional area is reduced from an upper end portion extending from the first flow passage portion to a lower end portion connected to the injection nozzle. Preferably, the channel cross-sectional area difference between the upper portion and the lower portion in the second flow path portion may be 10% to 30%.

In general, the flow velocity of the fluid is inversely proportional to the cross-sectional area, so that the flow paths of the second flow path portion whose cross-sectional area gradually decreases may allow the liquid fluid to quickly pass through the second flow path portion as the flow velocity of the liquid fluid gradually accelerates therein. The liquid fluid heat-exchanged from the flow path of the first flow path part may flow at a flow rate of 10% to 30% faster in the flow path of the second flow path part.

Furthermore, this structure can increase the spreading area and speed of the liquid fluid because the liquid fluid reaches the spray nozzle at high pressure due to the narrow cross-sectional area and the high flow rate of the second flow path.

When the difference in cross-sectional area is less than 10%, it is not preferable because the flow rate of the liquid fluid cannot be expected, and when it exceeds 30%, an excessively high pressure environment is formed in the second flow path, so that the liquid fluid is formed on the second flow path. It is not preferable because it may be accumulated.

In addition, the flow paths of the first flow path part, for example, the first flow path and the second flow path may have the same length or shorter length than the flow paths of the second flow path part, for example, the third flow path and the fourth flow path. have.

When the flow path length of the first flow path part is configured to be longer than the flow path length of the second flow path part, the length of the second flow path part is short, so that it is not easy to accelerate the liquid fluid, but also the upper end and the second flow path of the first flow path part. It is not preferable because the difference in heat exchange efficiency at the lower end adjacent to the portion is increased. On the contrary, when the flow path length of the first flow path part is excessively shorter than the flow path length of the second flow path part, since the liquid fluid flows into the second flow path part without sufficient heat exchange from the first flow path part, the heat exchange efficiency is deteriorated. In detail, the flow paths of the first flow path part may be formed to have a length of 80% to 100% of the length of the flow path of the second flow path part.

As described below, the first flow path part and the second flow path part may be made of a lightweight and simple structure to enable the implementation of a compact battery pack.

In one specific example, the first flow path portion and the second flow path portion are metal plates made of a concave-convex structure, and when the metal plate is mounted on the outer surface of the cover member, a space between the outer surface of the cover member and its inner surfaces is provided. It may be a structure that forms the unit flow path of the hollow structure.

The structure has an advantage of high cooling efficiency since the liquid fluid can directly perform heat exchange with the cover member when passing through the hollow flow path of the first flow path part and the second flow path part. Here, the outer surface of the cover member and the bonding surface of the metal plate may be equipped with rubber or silicon to reinforce the sealing.

In another specific example, each of the first flow path part and the second flow path part may be a tube of a polymer resin in which at least one flow path having an internal hollow structure is formed.

The tube made of the polymer has the advantage that it is very lightweight but can have corrosion resistance to the liquid fluid.

Alternatively, each of the first flow path part and the second flow path part may be made of a metal conduit of an internal hollow structure.

The metal conduit may be one or more selected from metals that are lightweight and have high thermal conduction efficiency, such as copper and aluminum.

Meanwhile, in the battery pack according to the present invention, the connector member may be a wire connector extending outward through the cover member while being connected to the cell assembly.

Such a wire connector may electrically connect the cell assembly and the device to enable driving of the device, and in some cases the wire connector may include two or more wire connectors as well as the device, as well as another electronic device, for example It may be used in connection with a device such as a camera or a light emitting diode (LED).

Alternatively, the connector member may be a connector terminal mounted and drawn on the outer surface of the cover member while being connected to the cell assembly, and the connector of this structure is coupled to the input terminal formed on the battery pack mounting part formed in the device to provide electrical connection. The battery pack may have a structure that can be mounted and detached by sliding on the mounting portion.

The cover member may be a structure surrounding the outer surface of the cell assembly in a state in which the cover member is in close contact with the front surface of the cell assembly so that the cell assembly is not exposed to the outside. Here, the front surface is each of the surfaces formed in a state in which the battery cells are arranged, for example, when the cylindrical battery cells are arranged and stacked so that the cell assembly generally constitutes a hexagonal body, the front surface is each surface of the hexagonal body.

The cover member may be at least one selected from a polymer resin plate, a metal plate, and a pouch-type sheet.

On the other hand, the battery cell in the present invention is not particularly limited, but as a specific example, lithium ion (Li-ion) secondary battery, lithium polymer (Li-ion) having the advantages of high energy density, discharge voltage, output stability, etc. -polymer secondary battery, or a lithium secondary battery such as a lithium-ion polymer (Li-ion polymer) secondary battery.

In general, a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a lithium salt-containing nonaqueous electrolyte.

The positive electrode is manufactured by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder on a positive electrode current collector and / or an extension current collector, and then drying the composition, and optionally adding a filler to the mixture. do.

The positive electrode current collector and / or the extension current collector is generally made to a thickness of 3 to 500 micrometers. The positive electrode current collector and the extension current collector are not particularly limited as long as they have high conductivity without causing chemical change in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum Surface treated with carbon, nickel, titanium, silver or the like on the surface of the stainless steel may be used. The positive electrode current collector and the extension current collector may form fine irregularities on the surface thereof to increase adhesion of the positive electrode active material, and may be in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.

The positive electrode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Lithium manganese oxides such as Li _{1 + x} Mn _2-x O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO _2, and the like; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ , Cu ₂ V ₂ O ₇ and the like; Ni-site type lithium nickel oxide represented by the formula LiNi _1-x M _x O ₂ , wherein M = Co, Mn, Al, Cu, Fe, Mg, B, or Ga, and x = 0.01 to 0.3; Formula LiMn _2-x M _x O ₂ (wherein M = Co, Ni, Fe, Cr, Zn or Ta and x = 0.01 to 0.1) or Li ₂ Mn ₃ MO ₈ (wherein M = Fe, Co, Lithium manganese composite oxide represented by Ni, Cu or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with alkaline earth metal ions; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ and the like, but are not limited to these.

The conductive material is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. Such a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery. Examples of the conductive material include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is a component that assists the bonding of the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

The filler is optionally used as a component for inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery. Examples of the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.

The negative electrode is manufactured by coating and drying a negative electrode active material on a negative electrode current collector and / or an extension current collector, and optionally, the components as described above may be further included if necessary.

The negative electrode current collector and / or the extension current collector is generally made to a thickness of 3 to 500 micrometers. Such a negative electrode current collector and / or an extended current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, Surface treated with carbon, nickel, titanium, silver, or the like on the surface of copper or stainless steel, aluminum-cadmium alloy, and the like can be used. In addition, like the positive electrode current collector, fine concavities and convexities may be formed on the surface to enhance the bonding strength of the negative electrode active material, and may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.

As said negative electrode active material, For example, carbon, such as hardly graphitized carbon and graphite type carbon; Li _x Fe ₂ O ₃ (0 ≦ _x ≦ 1), Li _x WO ₂ (0 ≦ _x ≦ 1), Sn _x Me _1-x Me ' _y O _z (Me: Mn, Fe, Pb, Ge; Me' Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen, 0 <x ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8); Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; SnO, SnO ₂ , PbO, PbO ₂ , Pb ₂ O ₃ , Pb ₃ O ₄ , Sb ₂ O ₃ , Sb ₂ O ₄ , Sb ₂ O ₅ , GeO, GeO ₂ , Bi ₂ O ₃ , Bi ₂ O ₄ , and metal oxides such as Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separator is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the membrane is generally 0.01 to 10 micrometers, the thickness is generally 5 to 300 micrometers. As such a separator, for example, olefin polymers such as chemical resistance and hydrophobic polypropylene; Sheets made of glass fibers or polyethylene, nonwoven fabrics, and the like are used. When a solid electrolyte such as a polymer is used as the electrolyte, the solid electrolyte may also serve as a separator.

The electrolyte may be a lithium salt-containing non-aqueous electrolyte, and consists of a non-aqueous electrolyte and a lithium salt. As the nonaqueous electrolyte, nonaqueous organic solvents, organic solid electrolytes, inorganic solid electrolytes, and the like are used, but not limited thereto.

Examples of the non-aqueous organic solvent include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, and gamma Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxorone, formamide, dimethylformamide, dioxolon , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be used.

Examples of the organic solid electrolyte include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymers containing ionic dissociating groups and the like can be used.

Examples of the inorganic solid electrolyte include Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO ₄ -LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides, sulfates and the like of Li, such as Li ₄ SiO ₄ -LiI-LiOH, Li ₃ PO ₄ -Li ₂ S-SiS ₂ , and the like, may be used.

The lithium salt is a good material to dissolve in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO ₄ , LiBF ₄ , LiB ₁₀ Cl ₁₀ , LiPF ₆ , LiCF ₃ SO ₃ , LiCF ₃ CO ₂ , LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide _.

In addition, for the purpose of improving charge / discharge characteristics, flame retardancy, etc., for example, pyridine, triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide, Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride and the like may be added. have. In some cases, in order to impart nonflammability, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics, and FEC (Fluoro-Ethylene) may be further included. Carbonate), PRS (Propene sultone) may be further included.

In one specific example, lithium salts such as LiPF ₆ , LiClO ₄ , LiBF ₄ , LiN (SO ₂ CF ₃ ) _2, and the like, may be prepared by cyclic carbonate of EC or PC, which is a highly dielectric solvent, and DEC, DMC, or EMC, which are low viscosity solvents. Lithium salt-containing non-aqueous electrolyte can be prepared by adding to a mixed solvent of linear carbonate.

The present invention also provides an unmanned aerial vehicle including the battery pack.

Specifically, the unmanned vehicle is an unmanned aerial vehicle capable of flying through propellers connected to the motor by driving the motor with the power of the battery pack.

The unmanned vehicle has a liquid tank for storing a extinguishing agent for extinguishing fire therein, and when the extinguishing agent is sprayed from the liquid tank to the outside of the unmanned aerial vehicle, the extinguishing agent is provided with a fluid guide member of the battery pack. It is characterized by cooling the heat of the battery pack by heat exchange while flowing through.

Such unmanned aerial vehicles can be used for extinguishing fire in hard-to-access areas such as wildfires or high-rise buildings with a wide range of fires, and can greatly improve fire safety by spraying liquid fluids such as extinguishing fluids and extinguishing agents from the air. have.

In addition, the unmanned aerial vehicle is configured to cool the battery pack by using a fire extinguishing agent when performing a fire extinguishing operation, thereby preventing deterioration of battery cells included in the battery pack, thereby improving battery pack stability and safety. It consists of structures that can be.

The present invention also provides an unmanned aerial vehicle including the battery pack.

Specifically, the unmanned vehicle is an unmanned vehicle that can fly through a propeller connected to the motor by driving the motor with the power of the battery pack,

The unmanned vehicle has a liquid tank for storing pesticides therein, and when the pesticide is sprayed from the liquid tank to the outside of the unmanned vehicle, the pesticide flows through the fluid guide member of the battery pack by heat exchange. It is characterized by cooling the heat of the battery pack.

Such unmanned aerial vehicles can be used for the control of forests or arable land having a large area, and by spraying pesticides in the air, it is possible to maximize the work time and the work efficiency compared to manual work by manpower.

In addition, the unmanned aerial vehicle has a structure that cools the battery pack using pesticides when the control operation is performed, thereby preventing deterioration of battery cells included in the battery pack, thereby improving battery pack stability and safety. It consists of structures that can be.

The present invention also provides a device including the battery pack as a power source. The device is any one selected from the group consisting of an unmanned aerial vehicle, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device. It can be one.

As described above, the battery pack according to the present invention, instead of having a liquid fluid for cooling, cooling is performed using a liquid fluid sprayed out from the device, the refrigerant and the cooling system for circulation of the refrigerant There is no need to provide a relatively lightweight but made of a structure that can remove the heat of the battery pack.

1 is a schematic view of a battery pack according to an embodiment of the present invention;
2 is an exploded schematic of the cell assembly;
3 is a schematic view of a battery pack assembled with a cell assembly, a connector member and a cover member;
4 is a schematic plan view showing the structure of the fluid guide member;
5 is a schematic diagram showing the velocity of the fluid in the second flow path portion;
6 is a schematic view of a fluid guide member according to one embodiment of the present invention;
FIG. 7 is a schematic plan view of FIG. 6 viewed from the top;
8 is a schematic view of a fluid guide member according to another embodiment of the present invention;
9 is a schematic diagram of an unmanned aerial vehicle according to an embodiment of the present invention;
10 is a vertical cross-sectional view of the unmanned aerial vehicle of FIG. 9.

Hereinafter, although described with reference to the drawings according to an embodiment of the present invention, this is for easier understanding of the present invention, the scope of the present invention is not limited thereto.

1 illustrates a battery pack 100 according to an embodiment of the present invention, and FIGS. 2 and 3 schematically show a cell assembly, a cover member 20 and a connector member.

Referring to these drawings, the battery pack 100 includes a cell assembly 10, a cover member 20, a connector member 30, a connector member 30, and a fluid guide member 200. It includes.

The cell assembly 10 includes six cylindrical battery cells 1 and 2, each of which is arranged two by two with the positive electrode facing to the left to form a total of three battery pairs.

Nickel plates 3 are arranged between the battery pairs for their electrical connection. In the nickel plate 3, two pairs of battery cells 1 and 2 positioned on both sides thereof are joined by spot welding, whereby adjacent battery cells (banks) in a vertical direction form a parallel connection, and in a horizontal direction. Adjacent battery cells form a series connection and are generally composed of two parallel to three series connection structures.

However, the cell assembly 10 shown in FIG. 2 is one non-limiting example, and the cell assembly 10 of the present invention differs from FIG. 2 in that less than six or more than six cylindrical or plate-shaped battery cells are provided. It is also possible to configure a structure that makes electrical connections in an arranged state.

This cell assembly 10 is sealed by the cover member 20 so that its outer surface is not exposed to the outside, as shown in FIG.

The cover member 20 may surround the outer surface of the cell assembly 10 in a state of being in close contact with the front surface of the cell assembly 10. The front surface of the cell assembly 10 is roughly formed surfaces formed in a state in which the battery cells are arranged, and the cell assembly of FIG. 2 includes a top surface and a bottom surface where the nickel plate is located, and an entire cross section extending between the top and bottom surfaces, It may be a hexahedron including a rear cross section and sides.

The cover member 20 may be selectively used in a polymer resin plate, a metal plate, and a pouch-type sheet having a light weight and excellent thermal conductivity.

The connector member 30 is a wire connector extending outward through the cover member 20 in an electrically connected state with the nickel plate 3 in the cell assembly 10.

Among the outer surfaces of the cover member 20, a fluid guide member 200 is formed on the upper surface d1, the lower surface d2, and the side surfaces d3 and d4 except for the front surface and the rear surface. .

The specific structure of the fluid guide member 200 is shown in FIGS. 4 to 8.

First, referring to FIG. 4, the fluid guide member 200 includes a first flow path part 210 and a second flow path part 220 connected to communicate with the first flow path part 210.

The first flow path part 210 extends from one side of the manifold 212 and the manifold 212, which is in close contact with the upper surface of the cover member 20, and has a first side surface d4 which is a side surface of the cover member 20. 2nd flow path extended from the other side of the 1st flow path 214 and the manifold 212 which are in close contact with a part of, and in close contact with a part of the 2nd side surface d3 facing the 1st side surface d4. And 216.

The manifold 212 includes a connecting portion 213 for connecting to the liquid tank at the top of the battery pack 100, and the liquid fluid flowing from the liquid tank into the first flow passage 214 and the second flow passage 216. Induce. At this time, when the liquid tank is opened, the liquid fluid exists in a high pressure state in the manifold 212, and flows into the first flow path 214 and the second flow path 216 which are relatively low pressure, and closely adheres to the manifold 212. Heat exchange is performed with the upper surface d1 of the covered cover member 20.

Thereafter, the first flow passage 214 and the second flow passage 216 may be configured to separate the liquid fluid received from the manifold 212 from the gravity and the hydraulic pressure, that is, the first flow passage 214 having a relatively high hydraulic pressure. The liquid fluid which is guided to the second flow path part 220 by the movement in the lower direction of the second flow path 216 and flows through the first flow path 214 and the second flow path 216 is formed in the battery pack 100. Heat exchange is performed with the cover member 20 on the side.

The second flow path part 220 is connected to communicate with the first flow path 214 and is in contact with the first side surface d4 except for the first flow path, the third flow path 224 and the second flow path 216. The fourth flow path 226 and the third flow path 224 and the fourth flow path 226 which are connected to each other and are in close contact with the second side surface d3 except for the second flow path 216. And a spray nozzle 222 in close contact with the lower surface of the cover member 20 in a state.

The third flow passage 224 and the fourth flow passage 226 guide the flow of the liquid fluid received from the first flow passage 214 and the second flow passage 216 to the injection nozzle 222 and the third flow passage 224. The liquid fluid flowing through the fourth flow path 226 performs heat exchange with the cover member 20 at the side of the battery pack 100.

The injection nozzle is formed with an injection unit 223 having a nozzle structure for injecting the liquid fluid received from the third flow path 224 and the fourth flow path 226 to the outside, and is in a high pressure state through the injection part 223. The liquid fluid is sprayed out of the fluid guide member 200. At this time, the liquid fluid immediately before the spray from the injection nozzle 222 may perform heat exchange with the cover member 20 on the lower surface of the battery pack 100.

On the other hand, the fluid guide subsidiary 200 is configured such that the liquid fluid flows at a faster flow rate in the second flow path portion 220 than the first flow path portion (210).

Specifically, the third flow path 224 and the fourth flow path 226 included in the second flow path part 220 are connected to the injection nozzle from the upper end portion a extending from the first flow path part 210. It consists of a structure in which the internal cross-sectional area is reduced to the lower portion (a ').

In this regard, referring to FIG. 5, the flow paths 224 and 226 of the second flow path part 220 have a cross-sectional area S1 closer to a portion (a) through which the liquid fluid flows from the first flow path part 210. The cross-sectional area S2 larger and closer to the injection nozzle 222 is formed in a gradually decreasing shape. Therefore, the flow paths 224 and 226 of the second flow path part 220 have a speed V2 closer to the injection nozzle 222 than the speed V1 closer to the portion a where the liquid fluid flows. You lose.

This is because the initial liquid fluid flowing out of the liquid tank is relatively low temperature, and in this state, after heat exchange with the first flow path part 210, when introduced into the second flow path part 220, the liquid fluid is relatively hot. In order to prevent the efficiency of heat exchange of the second flow path part 220 to be reduced, the liquid fluid heated from the flow paths 212 and 214 of the first flow path part 210 may be formed in the second flow path part 220. It is possible to minimize the temperature variation of the liquid fluid between the first flow path portion 210 and the second flow path portion 220 while passing through the flow paths 224 and 226 faster, and consequently, the first flow path portion 210 and the first flow path portion 210 and 226. It is possible to minimize the heat exchange efficiency difference in the two flow path unit 220.

In addition, this structure, the liquid fluid reaches the injection nozzle 222 in a high pressure state by the narrow cross-sectional area and the high flow rate of the second flow path portion 220, the liquid fluid in the high pressure state through the injection unit 223 Since it can be sparged, the sparging area and velocity of the liquid fluid are increased during sparging.

6 and 7 show the structure of the fluid guide member 200 according to one embodiment of the present invention.

Referring to these drawings, each of the first flow path part 210 and the second flow path part 220 of the fluid guide member 200 may be a metal plate having an uneven structure.

As shown in FIG. 7, the uneven structure includes plate 233 and barrier ribs 231 extending in a vertical direction from one surface of plate 233, and the barrier ribs 231 and plate 233 make up. An inner space 235 is formed on the inner surface and the inner space 235 is divided by the partitions 231.

When the metal plate having the uneven structure is mounted on the outer surface of the cover member 20, the outer surface of the cover member 20 and the inner space 235 of the metal plate are sealed from the outside, and the flow paths 234 of the hollow structure are formed in the space therebetween. ) Is formed. Here, the flow paths 234 may include a first flow path 214 of the first flow path part 210, a second flow path 216, and / or a third flow path 224 and a fourth flow path of the second flow path part 220. It means the unit flow path of the hollow structure contained in 226, respectively.

This structure has a high cooling efficiency since the liquid fluid can directly exchange heat with the cover member 20 when passing through the hollow flow paths of the first flow path part 210 and the second flow path part 220. As a result, the flow rate of the liquid fluid can be uniformly divided into each unit flow path, which is advantageous for the flow of a large amount of liquid fluid.

On the other hand, the fluid guide member 200 is a tube of a polymer resin in which a plurality of unit flow paths having an internal hollow structure are formed in each of the first flow path part 210 and the second flow path part 220, as shown in FIG. 8. It may also consist of a tube or a metal conduit.

9 and 10 illustrate an unmanned aerial vehicle according to one embodiment of the present invention.

Referring to these drawings in conjunction with Figures 1 to 5, the flying vehicle 400 is mounted to the main body 410, arms 422 and arms 422 extending in a diagonal direction from the main body 410 Motor (not shown) and propellers 420 connected to the motor.

Inside the main body 410 there are circuits (not shown) for the control of the wireless aircraft 400, a liquid tank 430 for storing the battery pack 100 and the pesticide 440 for providing power to the motor and the circuit. It is built in.

The liquid tank 430 is embedded in the upper portion of the battery pack 100 and is connected to the manifold 212 of the first flow path part 210.

When the unmanned aerial vehicle 400 opens the pesticide 440 from the liquid tank 430, the pesticide is manifold 212 of the fluid guide member 200 of the battery pack 100, the first flow path part 210, and the first path part 210. The battery pack 100 is cooled by being exchanged with the outer surface of the cover member 20 of the battery pack 100 while sequentially flowing through the two flow path parts 220 and the spray nozzles. Thereafter, when the spray unit is opened while the pesticide 440 reaches the spray unit of the spray nozzle, the pesticide 440 may be sprayed from the inside of the unmanned vehicle 400 to the outside.

When the unmanned aerial vehicle 400 performs a control operation, while cooling the battery pack 100 using the pesticide 440, it can be effectively used for the control of forests or farmland having a large area.

Those skilled in the art to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

Claims (21)

A battery pack mounted on a device for spraying liquid fluid to the outside to supply power,
A cell assembly comprising two or more battery cells;
A cover member surrounding at least a portion of an outer surface of the cell assembly;
At least one connector member electrically connected to the cell assembly and connected to the device in a state led outwardly through a cover member; And
And a fluid guide member formed on an outer surface of the cover member and including two or more flow paths having a hollow structure to allow liquid fluid to flow therein.
The fluid guide member,
A manifold connecting the liquid tank storing the liquid fluid and the two or more flow paths to guide the liquid fluid flowing from the liquid tank into the two or more flow paths; And
A nozzle connected to the two or more flow paths for receiving the liquid fluid from the two or more flow paths and spraying the liquid fluid to the outside of the device;
The fluid guide member receives liquid liquid to be sprayed out of the device from the manifold to guide the outer surface of the cover member, so that the liquid fluid is sprayed out of the device through the spray nozzle immediately after cooling the battery pack. The battery pack, characterized in that configured to. The method of claim 1, wherein the fluid guide member,
A first flow path portion connected to the manifold and including two or more flow paths for receiving and directing a liquid fluid from the manifold; And
A second flow path part including two or more flow paths communicating with the first flow path part;
More,
The liquid fluid flows from the liquid tank to the second flow path portion through the first flow path portion while performing a heat exchange with the outer surface of the cover member. The method of claim 2, wherein the first flow path portion,
At least one first flow passage extending from one side of the manifold and connected to a portion of the second flow passage portion in close contact with a portion of the first side surface, which is a side surface of the cover member; And
At least one second flow passage extending from the other side of the manifold and connected to a portion of the second flow passage portion in close contact with a portion of the second side surface facing the first side surface;
Battery pack comprising a. The method of claim 3, wherein the second flow path portion,
A third flow passage communicating with the first flow passage and in close contact with the first side surface except for the first flow passage;
A fourth flow passage communicating with the second flow passage and in close contact with the second side surface except for the second flow passage;
Including,
The injection nozzle is configured to be open and closed, the battery pack, characterized in that for opening, injecting the liquid fluid received from the third flow path and the fourth flow path to the outside, and suppressing the injection of the liquid fluid during the closing . The battery pack according to claim 2, wherein the liquid fluid flows from the first flow path part to the second flow path part by gravity and / or a difference in the liquid fluid hydraulic pressure in the first flow path part and the second flow path part. The space between the outer surface of the cover member and its inner surfaces when the metal plate is mounted on the outer surface of the cover member. A battery pack comprising a unit flow passage having a hollow structure. The battery pack as claimed in claim 2, wherein each of the first flow path part and the second flow path part is a tube of a polymer resin in which at least one unit flow path having an internal hollow structure is formed. The battery pack according to claim 2, wherein each of the first flow path part and the second flow path part is a metal conduit having an internal hollow structure. The battery according to claim 2, wherein the flow path included in the second flow path part has a structure in which an internal cross-sectional area is reduced from an upper end part extending to the first flow path part to a lower end part connected to the injection nozzle. pack. The battery pack as claimed in claim 9, wherein a difference in the cross-sectional area between the upper end portion and the lower end portion of the second flow path part is 10% to 30%. The battery pack of claim 9, wherein the liquid fluid heat-exchanged from the flow path of the first flow path part flows at a flow rate of 10% to 30% faster in the flow path of the second flow path part. The battery pack as claimed in claim 1, wherein the connector member is a wire connector extending outward through the cover member while being connected to the cell assembly. The battery pack as claimed in claim 1, wherein the connector member is a connector terminal mounted and drawn out on an outer surface of the cover member while being connected to the cell assembly. The battery pack as claimed in claim 1, wherein the cover member surrounds the outer surface of the cell assembly in close contact with the front surface of the cell assembly such that the cell assembly is not exposed to the outside. The battery pack according to claim 11, wherein the cover member is at least one selected from a polymer resin plate, a metal plate, and a pouch-type sheet. The battery pack of claim 1, wherein the liquid fluid is one selected from a fire extinguishing agent, a pesticide, and an insecticide. The battery pack according to claim 1, wherein the device is a main body of an unmanned aerial vehicle. The battery pack according to claim 1, wherein the battery cell is a lithium ion secondary battery, a lithium polymer secondary battery or a lithium ion polymer secondary battery. An unmanned aerial vehicle capable of driving a motor using the power of the battery pack according to claim 1 to fly through propellers connected to the motor,
The unmanned vehicle has a liquid tank for storing a extinguishing agent for extinguishing fire therein, and when the extinguishing agent is sprayed from the liquid tank to the outside of the unmanned aerial vehicle, the extinguishing agent is provided with a fluid guide member of the battery pack. Unmanned air vehicle characterized by cooling the heat of the battery pack by heat exchange while flowing through. An unmanned aerial vehicle capable of driving through a propeller connected to a motor by driving the motor with the power of the battery pack according to claim 1,
The unmanned vehicle has a liquid tank for storing pesticides therein, and when spraying the pesticide from the liquid tank to the outside of the unmanned vehicle, the pesticide flows through the fluid guide member of the battery pack by heat exchange. Unmanned air vehicle characterized by cooling the heat of the battery pack. A device comprising the battery pack according to claim 1 as a power source.

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