KR20190091069A - Gap Filler - Google Patents

Abstract

The present application provides a gap filler and a use thereof. The present application may provide the gap filler which can be applied to various uses and has the appropriate adhesive properties, heat dissipation properties, thermal conductivity, reworkability, storage stability, insulation properties, and durability. The gap filler comprises: polyalphaolefin oil; and a filler.

Description

Gap Filler {Gap Filler}

This application relates to a gap filler.

Materials capable of filling gaps are required in various fields, and in some cases, a gap filling material having thermal conductivity is required.

For example, a gap filler having a thermal conductivity may be required in manufacturing a battery pack.

The secondary battery includes a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery or a lithium secondary battery, and a lithium secondary battery is typical. After a plurality of such secondary batteries (hereinafter referred to as battery cells) are electrically connected to each other, a structure housed in a case is called a battery module. For example, Patent Document 1 is a simple battery module. While manufacturing in a low-cost process, there is disclosed a battery module having excellent heat dissipation characteristics and energy efficiency relative to volume.

In applications where higher output is required, so-called battery packs are constituted by storing a plurality of such battery modules electrically connected to each other and being stored in a case or the like. In the process of implementing the battery pack, a gap filler may be required between the battery module and the battery module and / or between the battery module and the case of the battery pack.

Korean Laid-Open Patent No. 2016-0105354

The present application provides a gap filler and its use.

The gap filler of the present application includes at least an oil component; And thermally conductive fillers. The gap filler of the present application may be used for various purposes, and as described below, the gap filler may include a battery pack configured to accommodate a plurality of battery modules in a case, and / or between the battery module and the battery pack. It may be located between the case and the battery module.

The physical properties required for the gap filler for the above uses are appropriate adhesion to effectively maintain a plurality of battery modules, thermal conductivity to efficiently transfer heat generated from the module to the case of the pack, and during the assembly process of the battery pack. Re-workability, which will allow the module to be detached and reattached, properties that will not damage the case or module (wear resistance, etc.), insulation properties, storage stability, and the like Durability, and the like, and the gap filler of the present application can stably satisfy the above characteristics.

The gap filler of the present application may be an uncured type. By uncured type, it is meant that there is no component present in the filler that can cause a curing reaction. It is advantageous to secure the reworkability among the above required physical properties to make the filler an uncured type.

The gap filler of the present application includes an oil component. By applying the oil component the filler can have suitable adhesion performance and insulation properties.

The oil component that can be applied in the present application is not particularly limited, and known mineral oils, vegetable oils, other synthetic oils, and the like may be used.

As the mineral oil in the above, alkanes and / or paraffins may be used, and for example, saturated ester oils and saturated hydrocarbons may be used. As the saturated hydrocarbon, for example, a saturated hydrocarbon having 1 to 30 carbon atoms, 4 to 30 carbon atoms, 8 to 30 carbon atoms, 12 to 30 carbon atoms, and 18 to 26 carbon atoms may be used.

As the vegetable oil, any plant-based oil can be applied without particular limitation. For example, palm oil, flaxseed oil, coconut oil, sunflower oil, soybean oil ( soybean oil, safflower oil, and the like may be used.

Moreover, as synthetic oil, polyalphaolefin oil called what is called PAO, ester oil, such as trimethyl propane ester, etc. can be used, for example.

In the present application, an appropriate oil may be selected from the above known oils, and in consideration of required physical properties, a liquid oil or a semi-solid oil called grease may be used.

The filler may also include a thermally conductive filler as a filler. This filler allows the filler to exhibit adequate thermal conductivity and insulation properties.

As used herein, the term thermally conductive filler means a material having a thermal conductivity of about 1 W / mK or more, about 5 W / mK or more, about 10 W / mK or more, or about 15 W / mK or more. The thermal conductivity of the thermally conductive filler may be about 400 W / mK or less, about 350 W / mK or less or about 300 W / mK or less.

In the case where the measured temperature and / or pressure affects the physical properties among the physical properties mentioned in the present specification, unless otherwise stated, the physical properties mean physical properties measured at normal temperature and / or normal pressure.

In the present application, the term room temperature is a natural temperature that is not warmed or reduced, and may mean, for example, a temperature in a range of about 10 ° C to 30 ° C, about 25 ° C, or about 23 ° C. Also, unless stated otherwise, the unit of temperature is ° C.

In the present application, the term atmospheric pressure is a pressure when not particularly reduced or increased, and may be about 1 atm, such as atmospheric pressure.

Although the kind of thermally conductive filler is not specifically limited, A ceramic filler can be applied in consideration of insulation etc. For example, particles such as alumina, aluminum nitride (AlN), boron nitride (BN), silicon nitride, SiC or BeO, or aluminum hydroxide (Al (OH ₃ )), aluminum hydroxide oxide a ceramic filler, such as (Aluminium oxide hydroxide, AlO (OH)), magnesium hydroxide (Mg (OH ₂₎₎ of the metal hydroxide or the like can be used. In addition, if insulation properties can be ensured, application of carbon fillers such as graphite can also be considered. The shape or proportion of the filler is not particularly limited, and may be selected in consideration of the viscosity of the filler, the sedimentation potential, the thermal resistance or thermal conductivity, insulation, filling effect or dispersibility. In general, the larger the size of the filler, the higher the viscosity of the filler and the higher the likelihood that the filler will settle. In addition, the smaller the size, the higher the heat resistance tends to be. Therefore, in consideration of the above-mentioned, an appropriate kind of filler may be selected, and if necessary, two or more fillers may be used. In addition, it is advantageous to use a spherical filler in consideration of the filling amount, but fillers in the form of a needle or plate may be used in consideration of the formation of a network or conductivity. In one example, the average particle diameter of the thermally conductive filler may be in the range of 0.001 μm to 80 μm. In another example, the average particle diameter of the filler may be 0.01 μm or more, 0.1 or more, 0.5 μm or more, 1 μm or more, 2 μm or more, 3 μm or more, 4 μm or more, 5 μm or more, or about 6 μm or more. The average particle diameter of the filler is, in another example, about 75 μm or less, about 70 μm or less, about 65 μm or less, about 60 μm or less, about 55 μm or less, about 50 μm or less, about 45 μm or less, about 40 μm or less, about 35 μm or less, about 30 μm or less, about 25 μm or less, about 20 μm or less, about 15 μm or less, about 10 μm or less, or about 5 μm or less.

In one example, the filler may be a low hardness filler. Such a low hardness filler can prevent or minimize damage to the case or module. For example, a filler having a Mohs hardness of about 5 or less, 4.5 or less, or 4 or less may be used as the filler. In another example, the Mohs' Hardness may be about 1 or more, 1.5 or more, or 2 or more.

In order to ensure proper insulation, thermal conductivity and the hardness property, the above-described metal hydroxide particles, aluminum nitride (AlN), boron nitride (BN), and silicon nitride (SiN) nitride particles may be used as the filler, but are not limited thereto. It doesn't happen.

The proportion of the filler included in the filler may be selected in consideration of the above-described properties. For example, the filler may be included in the range of about 50 to 4,000 parts by weight relative to 100 parts by weight of the oil component of the filler. The weight part of the filler in another example is about 100 parts by weight or more, about 150 parts by weight or more, about 200 parts by weight or more, about 250 parts by weight or more, about 300 parts by weight or more, about 350 parts by weight or more, about 400 parts by weight or more, At least about 500 parts by weight, at least about 550 parts by weight, at least about 600 parts by weight, at least about 650 parts by weight, at least 700 parts by weight, at least 750 parts by weight, at least 800 parts by weight, at least 850 parts by weight, at least 900 parts by weight, 950 At least 1000 parts by weight, at least 1100 parts by weight, at least 1200 parts by weight, at least 1300 parts by weight, at least 1400 parts by weight, at least 1500 parts by weight, at least 1600 parts by weight, at least 1700 parts by weight, at least 1800 parts by weight or about Or about 1900 parts by weight, or about 3500 parts by weight or less, about 3000 parts by weight or less, or about 2500 parts by weight or less.

Fillers may also include antioxidants. The oil component included in the filler is advantageous to secure proper adhesion performance, insulation performance and reworkability as described above. The oil component is thermally decomposed to increase the viscosity of the filler over time, reduce adhesion, do. Therefore, an appropriate antioxidant is needed to suppress this phenomenon. The type of antioxidant that can be applied is not particularly limited, but in the filler system of the present application, a phenolic antioxidant, an amine antioxidant (for example, a hindered amine light stabilizer), and a thioester Based antioxidants or phosphite antioxidants are advantageous, and it is most suitable to apply both at the same time.

Phenolic antioxidants that can be applied include alkylated hydroxytoluenes such as butylated hydroxytoluene, alkyl hydroquinones such as tert-butyl hydroquinone, and tetrakis [methylene- 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane (tetrakis [methylene-3 (3', 5'-di-tert-butyl-4'-hydroxyphenyl) ) propionate] methane) (CAS No .: 6683-19-8); Octadecyl-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate (octadecyl-3 (3', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate) (CAS No .: 2082-79-3); 2 ', 3'-bis [3- (3', 5'-di-t-butyl-4'-hydroxyphenyl) propionyl] propionohydrazide (2 ', 3'-bis [3- (3 ', 5'-Di-t-butyl-4'-hydroxy-phenyl) propionyl] propionohydrazide) (CAS No .: 32687-78-8); N, N'-hexane-1,6-diylbis [3- (3,5-di-t-butyl-4-hydroxyphenylpropionamide (N, N'-Hexane-1,6-diylbis [3- (3,5-di-tert-butyl-4-hydroxyphenylpropionamide)]) (CAS No. 23128-74-7); triethylene glycol-bis-3- (3-t-butyl-4-hydroxy-5- Triphenylglycol-bis-3 (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate (CAS No .: 36443-68-2); 2,2'-thiodiethylenebis [ 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate (2,2'-thiodiethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate]) (CAS No .: 41484-35-9), tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate (tris (3,5-di-tert-butyl-4-hydroxybenzyl isocyanurate) (CAS No .: 27676-62-6), benzenepropanoic acid, 3,5-bis (1,1-dimethylethyl) -4-hydroxy-C7-9-branched alkyl ester (benzenepropanoic acid , 3,5-bis (1,1-dimethylethyl) -4-hydroxy-C7-9-branched alkyl esters) (CAS No .: 125643-61-0), 2,2'-ethylidenebis (4,6 -Di-tert-butylphenol) (2,2'-ethylid enebis (4,6-di-tert-butylphenol)) (CAS No .: 35958-30-6), N, N'-hexamethylene-bis (3,5-di-tert-butyl) -4-hydroxy N, N'-hexamethylene-bis (3,5-di-tert-butyl) -4-hydorxy hydrocinnamamide) (CAS No .: 23128-74-7), 4,4'-butylidene Bis (6-tert-butyl-3-methylphenol) (4,4'-butylidenebis (6-tert-butyl-3-methylphenol) (CAS No .: 85-60-9), tris (3,5-di -tert-butyl-4-hydroxybenzyl) isocyanurate (tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate) (CAS No. 27676-62-6), 4,6-bis (octylthiomethyl) -o-cresol (4,6-bis (octylthiomethyl) -o-cresol) (CAS No .: 110553-27-0), 1,2 -Bis (3,5-di-tert-butyl-4hydrocinnamoyl) hydrazine (1,2-bis (3,5-di-tert-butyl-4-hydrocinnamoyl) hydrazine) (CAS No. 32687-78- 8), poly (dicyclopentadiene-co-p-cresol) (CAS No .: 68610-51-5) or 1,3,5-trimethyl-2,4 , 6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene (1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4 -hydroxybenzyl) benzene) (CAS No .: 1709-70-2) and the like can be exemplified, but is not limited thereto.

Moreover, as an amine antioxidant, 1, 6- hexanediamine, N, N'-bis (2, 2, 6, 6- tetramethyl-4- piperidinyl-, 2, 4, 6- trichloro- Polymer of 1,3,5-triazine, reaction product of N-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine (1,6-hexanediamine, N, N ' -bis (2,2,6,6-tetramethyl-4-piperidinyl)-polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with, N-butyl-1-butanamine and N- butyl-2,2,6,6-tetramethyl-4-piperidinamine) (CAS No .: 192268-64-7); poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperi Poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol-alt-1,4-butanedioic acid) (CAS No .: 65447-77-0); bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate (Bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate (CAS No .: 41556-26-7); bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate (Bis (2,2,6,6-tetramethyl-4-piperidyl CAS No .: 52829-07-9); poly [N, N'-bis (2,2,6,6-tetrameth) Tyl-4-piperidinyl) -1,6-hexanediamine-co-2,4-dichloro-6-morpholino-1,3,5-triazine]) (Poly [N, N'-bis ( 2,2,6,6-tetramethyl-4-piperidinyl) -1,6-hexanediamine-co-2,4-dichloro-6-morpholino-1,3,5-triazine])) (CAS No .: 82451- 48-7); 2,2,6,6-tetramethyl-4-piperidinyl stearate (2,2,6,6-tetramethyl-4-piperidinyl stearate) (CAS No .: 167078-06-0); 1,6-hexanediamine, N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl)-, 2,4,6-trichloro-1,3,5-triazine Polymer, reaction product with 2,4,4-trimethyl-2-pentanamine (1,6-hexanediamine, N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl)-, polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with 2,4,4-trimethyl-2-pentanamine) (CAS No .: 72245-38-6); Or 1,3,5-triazine-2,4,6-triamine, N2, N2'-1,2-ethanediylbis [N- [3-[[4,6-bis [butyl (1,2 , 2,6,6-pentamethyl-4-piperidinyl) amino] -1,3,5-triazin-2-yl] amino] propyl-N'N "-dibutyl-N'N" -bis (1,2,2,6,6-pentamethyl-4-piperidinyl) (1,3,5-triazine-2,4,6-triamine, N2, N2'-1,2-ethanediylbis [N- [3-[[4,6-bis [butyl (1,2,2,6,6-pentamethyl-4-piperidinyl) amino] -1,3,5-triazin-2-yl] amino] propyl] -N 'N'-dibutyl-N'N "-bis (1,2,2,6,6-pentamethyl-4-piperidinyl)] (CAS No. 106990-43-6), etc. It may be illustrated, but is not limited thereto.

In addition, as a phosphite antioxidant, a phosphite antioxidant is a tris (2, 4-di-t- butylphenyl) phosphite (CAS No. : 31570-04-4), tetrakis (2,4-di-tert-butylphenyl) [1,1'-bisphenyl] -4,4'-diylbis (phosphonite) (tetrakis (2, 4-di-tert-butylphenyl) [1,1'-biphenyl] -4,4'-diylbis (phosphonite)) (CAS No .: 38613-77-3), triphenyl phosphite (CAS No 101-02-0), tripeylphosphine (CAS No .: 603-35-0), poly (dipropylene glycol) phenyl phosphite (CAS No .: 116265-68-0) or bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate) (CAS No .: 97994-11 One or two or more kinds selected from -1) and the like can be exemplified, but is not limited thereto.

Moreover, as a thioester antioxidant, Distearyl thiodipropionate (CAS No .: 693-36-7), Dilauryl thiodipropionate (CAS No. : 123-28-4), ditetradecyl 3,3'-thiodipropionate (CAS No .: 693-36-7), tridecyl 3- (3-oxo Tridecoxypropyl) sulfanylpropanoate (Tridecyl 3- (3-oxo-3-tridecoxypropyl) sulfanylpropanoate) (CAS No. 10595-72-9) or pentaerythritol tetrakis (3-la One or two or more selected from pentaerythritol tetrakis (3-laurylthiopropionate) (CAS No. 29598-76-3) and the like can be exemplified, but is not limited thereto.

As described above, any of the antioxidants may be used as the antioxidant, but it may be appropriate to apply a mixture of two or more of the antioxidants from the viewpoint of suppressing the viscosity increase, color change, and the like.

In one example, the application of the phenolic antioxidant and / or the amine antioxidant among the antioxidants as the primary antioxidant and the application of the phosphite antioxidant and / or the thioester antioxidant as the secondary antioxidant May be advantageous.

The ratio of the antioxidant included in the filler may be selected in consideration of the above-described properties, for example, it may be included within the range of about 100 parts by weight or less to 100 parts by weight of the oil component. The ratio is, in another example, at least about 0.5 parts by weight, at least about 1 part by weight, at least about 1.5 parts by weight, at least about 2 parts by weight, at least about 2.5 parts by weight, or at least about 3 parts by weight, or about 90 parts by weight or less, about 80 parts by weight or less, about 70 parts by weight or less, about 60 parts by weight or less, about 50 parts by weight or less, about 40 parts by weight or less, about 30 parts by weight or less, about 20 parts by weight or less, about 10 parts by weight or less or about 5 parts by weight Or less.

In addition, when the primary and secondary antioxidants are applied at the same time as described above, the secondary antioxidant may be applied in a ratio of 400 parts by weight or less to 100 parts by weight of the primary antioxidant. The ratio of the secondary antioxidant is about 5 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 30 parts by weight, 40 parts by weight, 50 parts by weight, 60 parts by weight in another example. 70 parts by weight, 80 parts by weight, 90 parts by weight, 100 parts by weight, 110 parts by weight, 120 parts by weight, 130 parts by weight, 140 parts by weight, 150 parts by weight, 160 parts by weight 170 parts by weight or more, 180 parts by weight or more, or 190 parts by weight or more, about 350 parts by weight or less, 300 parts by weight or less, or 250 parts by weight or less, but is not limited thereto.

Fillers may also be applied with dispersants. Such a dispersant may be applied in consideration of the dispersibility of the above-mentioned thermally conductive filler. That is, a metal hydroxide or the like may be selected from the thermally conductive fillers in consideration of the above-described thermal conductivity, insulation properties, low wear properties, and the like, and these fillers are often hydrophilic. On the other hand, since the oil component included in the filler is mainly hydrophobic, a dispersant may be applied to secure proper dispersibility.

The type of dispersant is not particularly limited, and for example, sodium stearate, stearic acid, oleic acid, oleylamine, parmitic acid, dodecanno Dodecanoil acid and / or isostearic acid may be used.

As a dispersant, an appropriate kind may be selected from the above, but in the filler system of the present application, fatty acids such as oleic acid or fatty acid amines such as oleylamine may be applied, and most suitably, both may be applied. .

The proportion of the dispersant included in the filler may be selected in consideration of the desired properties, for example, it may be included within the range of about 0.001 to 10 parts by weight relative to 100 parts by weight of the oil component. In addition, when fatty acids and fatty acid amines are used at the same time, about 20 to 50 parts by weight of fatty acid amine relative to 100 parts by weight of fatty acid may be applied. The ratio of fatty acid amines may be at least about 25 parts by weight, or at least 30 parts by weight, and in other examples, at most about 45 parts by weight, at most 40 parts by weight or at most about 35 parts by weight.

The filler may comprise additives which are necessary in addition to the above components.

For example, the filler may include a filler that is not thermally conductive, for example, and may include a filler to secure thixotropy. In this case, the filler need not be thermally conductive, and the ratio is not required to be particularly large as long as appropriate thixotropy is ensured.

The type of filler included in the filler is not particularly limited, but may be, for example, fumed silica, clay, calcium carbonate, or the like. The shape or proportion of the filler is not particularly limited, and may be selected in consideration of viscosity, sedimentation potential in the filler, thixotropy, insulation, filling effect or dispersibility, and if necessary, two or more fillers may be used. . In one example, the average particle diameter of the filler may be in the range of 0.001 μm to 80 μm. In another example, the average particle diameter of the filler may be 0.01 μm or more, 0.1 or more, 0.5 μm or more, 1 μm or more, 2 μm or more, 3 μm or more, 4 μm or more, 5 μm or more, or about 6 μm or more. The average particle diameter of the filler is, in another example, about 75 μm or less, about 70 μm or less, about 65 μm or less, about 60 μm or less, about 55 μm or less, about 50 μm or less, about 45 μm or less, about 40 μm or less, about 35 μm or less, about 30 μm or less, about 25 μm or less, about 20 μm or less, about 15 μm or less, about 10 μm or less, or about 5 μm or less.

The proportion of the filler included in the filler may be selected in consideration of the desired thixotropy. For example, the filler may be included in the range of about 100 to 300 parts by weight based on 100 parts by weight of the oil component.

Fillers may, if necessary, be used to control the viscosity, for example to increase or decrease the viscosity or to adjust the viscosity according to shear forces, such as thixotropic agents, diluents, dispersants, surface treatment agents or coupling agents, etc. It may further include.

Thixotropy agent can adjust the viscosity according to the shear force. Examples of the thixotropic agent that can be used include fumed silica and the like.

Diluents are used to lower the viscosity, and any one of various kinds known in the art can be used without limitation as long as the diluent is capable of exhibiting such a function.

The surface treatment agent is for the surface treatment of the filler introduced into the filler, and various kinds known in the art can be used without limitation as long as it can exhibit the above action.

The filler may further comprise a flame retardant or flame retardant aid and the like. As the flame retardant, various flame retardants known in the art may be applied without particular limitation. For example, a solid filler type flame retardant or a liquid flame retardant may be applied. Flame retardants include, for example, organic flame retardants such as melamine cyanurate, inorganic flame retardants such as magnesium hydroxide, and the like, but is not limited thereto.

If the filler is filled in a large amount of liquid type flame retardant materials (TEP, Triethyl phosphate or TCPP, tris (1,3-chloro-2-propyl) phosphate, etc.) may be used. In addition, a silane coupling agent may be added that can act as a flame retardant synergist.

The present application also relates to a battery pack to which the above-mentioned filler is applied. The battery pack is a pack case; A plurality of battery modules housed in the pack case; And the filler present between the plurality of battery modules or between the case and the battery module.

In the above structure, the battery modules may have a structure electrically connected to each other.

In one example, the battery module is a battery module known from Patent Document 1, which includes a module case including a thermally conductive portion and a plurality of battery cells, and the battery cell has a structure housed in the module case. Can be. The thermally conductive portions of the battery cell and the module case may be in contact with each other through the thermally conductive resin layer.

Further, in the structure, the filler may be present between the battery pack case and the thermally conductive portion of the module case. In this case, the case of the pack contacting the thermally conductive portion of the module case via the filler may also be a thermally conductive portion.

Contacting in the above means thermal contact as disclosed in Patent Document 1.

The structure of the battery module as described above is specifically disclosed in Patent Document 1, and the same may be applied to the present specification.

That is, the module case may include at least a side wall and a bottom plate forming an inner space in which the battery cells can be accommodated. The module case may further include a top plate for sealing the inner space. The side wall, the lower plate and the upper plate may be integrally formed with each other, or separate sidewalls, the lower plate and / or the upper plate may be assembled to form the module case. The shape and size of the module case is not particularly limited and may be appropriately selected according to the use, the shape and number of battery cells housed in the internal space, and the like.

FIG. 1 is a diagram showing an exemplary module case 10 and is an example of a box-shaped case 10 including one bottom plate 10a and four sidewalls 10b. As shown in FIG. 1, the module case 10 may further include a top plate 10c that seals the internal space.

2 and 3 are schematic views of the module cases 10, 10b, and 10c of FIG. 1 in which the battery cells 20 are housed, respectively, observed from the top and side surfaces thereof. 3, the thermal conductive resin layer 30 is also shown, and the guiding part 10d which guides the mounting of a battery cell is also shown. In the structure as shown in FIG. 3, when the lower plate 10c of the module case is the above-described thermally conductive portion, heat generated in the battery cell 20 is transferred to the lower plate 10c through the resin layer 30 to be released. Can be.

Accordingly, in this case, as shown in FIG. 4, the battery module 100 as shown in FIGS. 2 and 3 is stored in the case 200 of the plurality of battery packs to form a battery pack, and the filler 300 is disposed. When the case portion of the battery pack in contact with this is made thermally conductive, as shown in FIG. 4, excellent heat dissipation characteristics can be ensured by passing the cooling water CW through the lower portion CW of the battery pack.

Therefore, the module case or the battery pack case may be a thermally conductive case. The term thermally conductive case means a case in which the thermal conductivity of the entire case is 10 W / mk or more, or at least includes a portion having such thermal conductivity. For example, at least one of the above-described side wall, the bottom plate and the top plate and the battery pack case may have the above-described thermal conductivity. In another example, at least one of the sidewall, the bottom plate, and the top plate and the battery pack case may include a portion having the thermal conductivity.

The thermal conductivity of the top plate, bottom plate or side wall, bater pack case or thermally conductive portion of the thermally conductive module case may be at least 20 W / mk, at least 30 W / mk, at least 40 W / mk, and at least 50 W / mk. At least 60 W / mk, at least 70 W / mk, at least 80 W / mk, at least 90 W / mk, at least 100 W / mk, at least 110 W / mk, at least 120 W / mk, at least 130 W / mk, 140 W / mk or more, 150 W / mk or more, 160 W / mk or more, 170 W / mk or more, 180 W / mk or more, 190 W / mk or more, or 195 W / mk or more. The higher the thermal conductivity is, the more advantageous it is in terms of heat dissipation characteristics of the module, and the upper limit thereof is not particularly limited. In one example, the thermal conductivity is about 1,000 W / mK or less, 900 W / mk or less, 800 W / mk or less, 700 W / mk or less, 600 W / mk or less, 500 W / mk or less, 400 W / mk or less, It may be 300 W / mk or 250 W / mK or less, but is not limited thereto. The kind of the material which exhibits the above thermal conductivity is not particularly limited, and examples thereof include metal materials such as aluminum, gold, pure silver, tungsten, copper, nickel or platinum. The module case may be entirely made of such a thermally conductive material, or at least a part of the module case may be a portion of the thermally conductive material. Accordingly, the module case may have a thermal conductivity in the above-mentioned range, or may include at least a portion having the above-mentioned thermal conductivity.

In the above structure, the type of battery cell accommodated in the module case is not particularly limited, and various known battery cells may be applied. In one example, as described in Patent Document 1, a pouch-type battery cell may be used.

The kind of the thermally conductive resin layer included in the battery module in the above structure is not particularly limited, and a resin layer which may be the adhesive layer described in Patent Document 1 may be used.

That is, the resin layer may be an adhesive layer, and the adhesive force of the resin layer is about 150 gf / 10 mm or more, 200 gf / 10 mm or more, 250 gf / 10 mm or more, 300 gf / 10 mm or more, 350 gf / 10 mm or more or 400 gf / 10mm or more. The said adhesive force is measured about an aluminum pouch according to the system disclosed by patent document 1. The upper limit of the adhesive force of the resin layer is not particularly limited, and for example, about 2,000 gf / 10 mm or less, 1,500 gf / 10 mm or less, 1,000 gf / 10 mm or less, 900 gf / 10 mm or less, 800 gf / 10 mm or less, 700 gf 10 mm or less, 600 gf / 10 mm or less, or 500 gf / 10 mm or less.

In addition, the resin layer is a thermally conductive resin layer, the thermal conductivity is about 1.5 W / mK or more, about 2 W / mK or more, 2.5 W / mK or more, 3 W / mK or more, 3.5 W / mK or more or 4 W can be greater than / mK. The thermal conductivity is 50 W / mK or less, 45 W / mk or less, 40 W / mk or less, 35 W / mk or less, 30 W / mk or less, 25 W / mk or less, 20 W / mk or less, 15 W / mk Or less, 10 W / mK or less, 5 W / mK or less, 4.5 W / mK or less, or about 4.0 W / mK or less. As described above, when the resin layer is a thermally conductive resin layer, the lower plate, the upper plate, and / or the sidewall to which the resin layer is attached may be 10 W / mK or more. The thermal conductivity of a resin layer is a numerical value measured according to ASTMD5470 standard or ISO 22007-2 standard, for example. The manner in which the thermal conductivity of the resin layer is in the above range is not particularly limited. For example, the thermal conductivity of a resin layer can be adjusted using the filler which has thermal conductivity as a filler contained in a resin layer.

The thermal resistance of the resin layer or the battery module to which the resin layer is applied in the battery module is 5 K / W or less, 4.5 K / W or less, 4 K / W or less, 3.5 K / W or less, 3 K / W or less, or about 2.8 K / W or less. When adjusting the resin layer or the battery module to which the resin layer is applied such that the thermal resistance of the range appears, excellent cooling efficiency or heat radiation efficiency can be ensured. The method of measuring the thermal resistance is not particularly limited. For example, it can measure according to ASTM D5470 standard or ISO 22007-2 standard.

The resin layer is also subjected to a thermal shock test, for example, after a thermal shock test in which the cycle is repeated 100 times with one cycle of maintaining the temperature at 80 ° C. for 30 minutes and then maintaining the temperature at 80 ° C. for 30 minutes. It may be required to be formed so as not to be peeled or peeled from the module case or the battery cell of the module. For example, when the battery module is applied to a product that requires a long warranty period (about 15 years or more in the case of an automobile) such as an automobile, the above level of performance may be required to ensure durability.

The resin layer may be an electrically insulating resin layer. By the resin layer exhibiting electrical insulation in the above-described structure, the performance of the battery module can be maintained and stability can be ensured. The electrically insulating resin layer has an insulation breakdown voltage measured according to ASTM D149 of about 3 kV / mm or more, about 5 kV / mm or more, about 7 kV / mm or more, 10 kV / mm or more, 15 kV / mm or more 20 kV / mm or more. The higher the numerical value of the dielectric breakdown voltage, the resin layer is not particularly limited, but the resin breakdown voltage is not particularly limited. , 35 kV / mm or less, 30 kV / mm or less. The dielectric breakdown voltage as described above can also be controlled by controlling the insulation of the resin component of the resin layer. For example, the dielectric breakdown voltage can be adjusted by applying an insulating filler in the resin layer. Generally, among the thermally conductive fillers, the ceramic filler as described later is known as a component capable of ensuring insulation.

As the resin layer, a flame retardant resin layer may be applied in consideration of stability. As used herein, the term flame retardant resin layer may refer to a resin layer having a V-0 rating in a UL 94 V Test (Vertical Burning Test). This ensures stability against fire and other accidents that may occur in the battery module.

The resin layer may have a specific gravity of 5 or less. In another example, the specific gravity may be 4.5 or less, 4 or less, 3.5 or less, or 3 or less. The resin layer exhibiting specific gravity in this range is advantageous for the production of a lighter battery module. The lower the specific gravity is, the more advantageous the weight of the module is. Therefore, the lower limit thereof is not particularly limited. For example, the specific gravity may be about 1.5 or more or 2 or more. In order for the resin layer to exhibit specific gravity in the above range, components added to the resin layer may be adjusted. For example, when the filler is added, a filler capable of securing a desired thermal conductivity even at a low specific gravity as much as possible, that is, a filler having a low specific gravity or a surface-treated filler may be used.

The resin layer may have a ratio of nonvolatile content of 90 wt% or more, 95 wt% or more, or 98 wt% or more. In the above, the nonvolatile component and its ratio may be defined in the following manner. That is, the non-volatile portion may be defined as the non-volatile content of the remaining portion after maintaining the resin layer at 100 ° C for about 1 hour, and thus the ratio is maintained for about 1 hour at the initial weight of the resin layer and the 100 ° C It can measure based on a later ratio.

The resin layer as described above can be formed by blending a thermally conductive filler with the resin component as disclosed in Patent Document 1. Examples of the resin component that can be applied include acrylic resins, epoxy resins, urethane resins, olefin resins, urethane resins, EVA (Ethylene vinyl acetate) resins, silicone resins, precursors of the resins, and the like. As the thermally conductive filler, those disclosed in Patent Document 1, those contained in the filler, and the like can be used.

The present application provides a gap filler. In the present application, it is possible to provide a filler which is applied to various applications and has appropriate adhesive properties, heat dissipation properties, thermal conductivity, reworkability, storage stability, insulation properties, storage stability and durability.

1 is a diagram illustrating an exemplary module case.
2 and 3 are views illustrating a form in which a battery cell is accommodated in a module case.
4 is a diagram schematically showing the structure of a battery pack.

Hereinafter, the battery module of the present application will be described with reference to Examples and Comparative Examples, but the scope of the present application is not limited by the scope given below.

1. Evaluation method of oxidative stability

Oxidation stability was evaluated by placing the gap filler between two plates of 3 mm spacing and using ARES equipment to measure the force required to reduce the spacing of the plates to 0.3 mm and read a value of 0.5 mm. The value was measured according to the following criteria by measuring the number of days the force is three times the force taken for the initial gap filler.

<Oxidation Stability Evaluation Criteria>

(Double-circle): When the time which takes 3 times as much force as the initial stage is 15 days or more

○: When the point of time that is three times stronger than the initial time is 7 days or more and less than 15 days

(Triangle | delta): When the time which takes 3 times as much force as the initial stage is 2 days or more and less than 7 days

X: When the time which takes 3 times as much force as the initial stage is less than 2 days

2. Thermal stability  Assessment Methods

The thermal stability of the gap filler was evaluated by confirming the time when the filler was hardened while the gap filler was left in an oven at about 150 ° C.

Example  One.

A gap filler was prepared by mixing PAO oil (INES, Durasyn 168) as an oil component and aluminum hydroxide (Al (OH) ₃ ) and an antioxidant having a Mohs hardness of about 2.5 to 3.5 as a heat conductive filler. . As antioxidants, tetra [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane (primary antioxidant) and tris (2,4-di- tert-butylphenyl) phosphite (tris (2,4-di-tert-butylphenyl) phosphite) (secondary antioxidant) was used. The use ratio of the oil component, the thermally conductive filler, the primary antioxidant, and the secondary antioxidant in the above was about 8: 172.8: 0.09: 0.18 (oil: filler: primary antioxidant: secondary antioxidant).

Example  2.

Tris (2,4-di-tert-butylphenyl) phosphite (tris (2,4-di-tert-butylphenyl) phosphite) dash bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite A gap filler was prepared in the same manner as in Example 1 except for applying (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate).

Example  3.

A gap filler was prepared in the same manner as in Example 1 except that butylated hydroxytoluene was applied instead of tetra [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane. It was.

Example  4.

Same as Example 1, except that tert-butylhydroquinone was applied instead of tetra [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane A gap filler was prepared.

Example  5.

Octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl instead of tetra [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane ) A gap filler was prepared in the same manner as in Example 1 except that propionate (octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) was applied.

Example  6.

Triethyleneglycol-bis-3- (3-tert-butyl-4-hydroxy-5 instead of tetra [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane A gap filler was prepared in the same manner as in Example 1 except that trimethyl glycol-bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate was applied.

Example  7.

Thiodiethylenebis [3- (3.5-di-tert-butyl-4-hydroxyphenyl) instead of tetra [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane ) A gap filler was prepared in the same manner as in Example 1 except that propionate (thiodiethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) was applied.

Example  8.

Tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanu instead of tetra [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane A gap filler was prepared in the same manner as in Example 1, except that tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate was applied.

Example  9.

Tetra [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane instead of 1,3,5-trimethyl-2,4,6-tris (3,5-di Except for applying -tert-butyl-4-hydroxybenzyl) benzene (1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene) In the same manner as in Example 1, a gap filler was prepared.

Example  10.

Tris (2,4-di-tert-butylphenyl) phosphite (tris (2,4-di-tert-butylphenyl) phosphite) dash bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite A gap filler was prepared in the same manner as in Example 4 except for applying (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate).

Example  11.

Tris (2,4-di-tert-butylphenyl) phosphite (tris (2,4-di-tert-butylphenyl) phosphite) dash bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite A gap filler was prepared in the same manner as in Example 5 except for applying (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate).

Example  12.

Tris (2,4-di-tert-butylphenyl) phosphite (tris (2,4-di-tert-butylphenyl) phosphite) dash bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite A gap filler was prepared in the same manner as in Example 6 except for applying (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate).

Example  13.

Tris (2,4-di-tert-butylphenyl) phosphite (tris (2,4-di-tert-butylphenyl) phosphite) dash bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite A gap filler was prepared in the same manner as in Example 7, except that (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate) was applied.

Example  14.

Tris (2,4-di-tert-butylphenyl) phosphite (tris (2,4-di-tert-butylphenyl) phosphite) dash bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite A gap filler was prepared in the same manner as in Example 8 except for applying (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate).

Example  15.

Tris (2,4-di-tert-butylphenyl) phosphite (tris (2,4-di-tert-butylphenyl) phosphite) dash bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite A gap filler was prepared in the same manner as in Example 9 except for applying (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate).

Comparative example  One.

A gap filler was prepared in the same manner as in Example 1 except that no antioxidant was applied.

The evaluation results for the gap filler are summarized in Table 1 below.

Oxidative stability Thermal stability Example 1 ◎ 15th Example 2 ◎ 15th Example 3 △ 2 days Example 4 ○ 7 days Example 5 ○ 7 days Example 6 ○ 7 days Example 7 ○ 7 days Example 8 ○ 7 days Example 9 ○ 7 days Example 10 ○ 7 days Example 11 ○ 7 days Example 12 ○ 7 days Example 13 ○ 7 days Example 14 ○ 7 days Example 15 ○ 7 days Comparative Example 1 × Less than 1 day

10, 10a, 10b, 10c: module case
10d: guiding part
20: battery cell
30: resin layer
100: battery module
200: battery pack case
300: gap filler

Claims (20)

Oil components; A gap filler comprising a thermally conductive filler and an antioxidant. The gap filler according to claim 1, which is an uncured type. The gap filler according to claim 1, wherein the oil component is a synthetic oil, mineral oil or vegetable oil. The gap filler according to claim 1, wherein the oil component is ester oil, saturated hydrocarbon, paraffin, coconut oil, palm oil, flaxseed oil, sunflower oil, soybean oil, safflower seed oil or polyalphaolefin oil. The gap filler according to claim 1, wherein the thermally conductive filler is at least 1 W / mK. The gap filler according to claim 1, wherein the thermally conductive filler has a Mohs hardness of 5 or less. The gap filler according to claim 1, wherein the thermally conductive filler is metal hydroxide or nitride particles. The gap filler according to claim 1, wherein the thermally conductive filler is included in a ratio within the range of 50 to 4,000 parts by weight relative to 100 parts by weight of the oil component. The gap filler according to claim 1, wherein the antioxidant is a phenolic antioxidant, an amine antioxidant, a thioester antioxidant, or a phosphite antioxidant. 10. The method of claim 9, wherein the phenolic antioxidant is selected from the group consisting of alkylated hydroxytoluene; Alkyl hydroquinones; Tetrakis [methylene-3 (3 ', 5'-di-tert-butyl) [methylene-3- (3', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane -4'-hydroxyphenyl) propionate] methane) (CAS No .: 6683-19-8); Octadecyl-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate (octadecyl-3 (3', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate) (CAS No .: 2082-79-3); 2 ', 3'-bis [3- (3', 5'-di-t-butyl-4'-hydroxyphenyl) propionyl] propionohydrazide (2 ', 3'-bis [3- (3 ', 5'-Di-t-butyl-4'-hydroxy-phenyl) propionyl] propionohydrazide) (CAS No .: 32687-78-8); N, N'-hexane-1,6-diylbis [3- (3,5-di-t-butyl-4-hydroxyphenylpropionamide (N, N'-Hexane-1,6-diylbis [3- (3,5-di-tert-butyl-4-hydroxyphenylpropionamide)]) (CAS No. 23128-74-7); triethylene glycol-bis-3- (3-t-butyl-4-hydroxy-5- Triphenylglycol-bis-3 (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate (CAS No .: 36443-68-2); 2,2'-thiodiethylenebis [ 3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate (2,2'-thiodiethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate]) (CAS No .: 41484-35-9), tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate (tris (3,5-di-tert-butyl-4-hydroxybenzyl isocyanurate) (CAS No .: 27676-62-6), benzenepropanoic acid, 3,5-bis (1,1-dimethylethyl) -4-hydroxy-C7-9-branched alkyl ester (benzenepropanoic acid , 3,5-bis (1,1-dimethylethyl) -4-hydroxy-C7-9-branched alkyl esters) (CAS No .: 125643-61-0), 2,2'-ethylidenebis (4,6 -Di-tert-butylphenol) (2,2'-ethylid enebis (4,6-di-tert-butylphenol)) (CAS No .: 35958-30-6), N, N'-hexamethylene-bis (3,5-di-tert-butyl) -4-hydroxy N, N'-hexamethylene-bis (3,5-di-tert-butyl) -4-hydorxy hydrocinnamamide) (CAS No .: 23128-74-7), 4,4'-butylidene Bis (6-tert-butyl-3-methylphenol) (4,4'-butylidenebis (6-tert-butyl-3-methylphenol) (CAS No .: 85-60-9), tris (3,5-di -tert-butyl-4-hydroxybenzyl) isocyanurate (tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate) (CAS No. 27676-62-6), 4,6-bis (octylthiomethyl) -o-cresol (4,6-bis (octylthiomethyl) -o-cresol) (CAS No .: 110553-27-0), 1,2 -Bis (3,5-di-tert-butyl-4hydrocinnamoyl) hydrazine (1,2-bis (3,5-di-tert-butyl-4-hydrocinnamoyl) hydrazine) (CAS No. 32687-78- 8), poly (dicyclopentadiene-co-p-cresol) (CAS No .: 68610-51-5) or 1,3,5-trimethyl-2,4 , 6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene (1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4 Gap filler, -hydroxybenzyl) benzene) (CAS No .: 1709-70-2). The amine-based antioxidant according to claim 9, wherein the amine antioxidant is 1,6-hexanediamine, N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl-, 2,4,6- Polymer product with trichloro-1,3,5-triazine, reaction product of N-butanamine with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine (1,6-hexanediamine, N , N'-bis (2,2,6,6-tetramethyl-4-piperidinyl)-polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with, N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine) (CAS No .: 192268-64-7); poly (4-hydroxy-2,2,6,6-tetramethyl-1 Poly (4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol-alt-1,4-butanedioic acid)) (CAS No .: 65447-77-0); bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate (Bis (1,2,2,6,6-pentamethyl-4- piperidyl) sebacate) (CAS No .: 41556-26-7); bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate (Bis (2,2,6,6-tetramethyl- 4-piperidyl) sebacate) (CAS No .: 52829-07-9); poly [N, N'-bis (2,2,6,6) -Tetramethyl-4-piperidinyl) -1,6-hexanediamine-co-2,4-dichloro-6-morpholino-1,3,5-triazine]) (Poly [N, N'- bis (2,2,6,6-tetramethyl-4-piperidinyl) -1,6-hexanediamine-co-2,4-dichloro-6-morpholino-1,3,5-triazine])) (CAS No .: 82451-48-7); 2,2,6,6-tetramethyl-4-piperidinyl stearate (2,2,6,6-tetramethyl-4-piperidinyl stearate) (CAS No .: 167078-06-0); 1,6-hexanediamine, N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl)-, 2,4,6-trichloro-1,3,5-triazine Polymer, reaction product with 2,4,4-trimethyl-2-pentanamine (1,6-hexanediamine, N, N'-bis (2,2,6,6-tetramethyl-4-piperidinyl)-, polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with 2,4,4-trimethyl-2-pentanamine) (CAS No .: 72245-38-6); Or 1,3,5-triazine-2,4,6-triamine, N2, N2'-1,2-ethanediylbis [N- [3-[[4,6-bis [butyl (1,2 , 2,6,6-pentamethyl-4-piperidinyl) amino] -1,3,5-triazin-2-yl] amino] propyl-N'N "-dibutyl-N'N" -bis (1,2,2,6,6-pentamethyl-4-piperidinyl) (1,3,5-triazine-2,4,6-triamine, N2, N2'-1,2-ethanediylbis [N- [3-[[4,6-bis [butyl (1,2,2,6,6-pentamethyl-4-piperidinyl) amino] -1,3,5-triazin-2-yl] amino] propyl] -N 'N'-dibutyl-N'N "-bis (1,2,2,6,6-pentamethyl-4-piperidinyl)] (CAS No. 106990-43-6). The phosphite-based antioxidant according to claim 9, wherein the phosphite-based antioxidant is tris (2,4-di-tert-butylphenyl) phosphite (CAS No .: 31570- 04-4), tetrakis (2,4-di-tert-butylphenyl) [1,1'-bisphenyl] -4,4'-diylbis (phosphonite) (tetrakis (2,4-di- tert-butylphenyl) [1,1'-biphenyl] -4,4'-diylbis (phosphonite)) (CAS No .: 38613-77-3), triphenyl phosphite (CAS No. 101-02 -0), triphenylphosphine (CAS No .: 603-35-0), poly (dipropylene glycol) phenyl phosphite (CAS No .: 116265-68-) 0) or bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite (bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphate) (CAS No .: 97994-11-1) Gap filler. 10. The thioester antioxidant according to claim 9, wherein the thioester antioxidant is Distearyl thiodipropionate (CAS No .: 693-36-7), Dilauryl thiodipropionate ( CAS No .: 123-28-4), Ditetradecyl 3,3'-thiodipropionate (CAS No .: 693-36-7), Tridecyl 3- ( Trixoyl 3- (3-oxo-3-tridecoxypropyl) sulfanylpropanoate (CAS No. 10595-72-9) or pentaerythritol tetrakis ( Gap filler that is 3-laurylthiopropionate (Pentaerythritol tetrakis (3-laurylthiopropionate) (CAS No .: 29598-76-3). The gap filler according to claim 1, wherein the antioxidant comprises at least two selected from the group consisting of phenolic antioxidants, amine antioxidants, thioester antioxidants, and phosphite antioxidants. The method of claim 1, wherein the antioxidant is at least one selected from the group consisting of a primary antioxidant and a thioester antioxidant and a phosphite-based antioxidant which is at least one selected from the group consisting of phenolic antioxidant and amine antioxidant Gap fillers containing primary antioxidants. The gap filler according to claim 1, which comprises 100 parts by weight or less of antioxidant based on 100 parts by weight of the oil component. The gap filler according to claim 15, wherein the antioxidant comprises 400 parts by weight or less of a secondary antioxidant to 100 parts by weight of the primary antioxidant. Pack case; A plurality of battery modules housed in the pack case; And a filler as claimed in claim 1 between the plurality of battery modules or between the case and the battery module. The battery module of claim 18, wherein the battery module includes a module case including a thermally conductive portion having a thermal conductivity of 10 W / mk or more and a plurality of battery cells, wherein the battery cell is housed in the module case. And the thermally conductive portion of the module case is in thermal contact with a thermally conductive resin layer having a thermal conductivity of 1.5 W / mK or more. 20. The battery pack of claim 19, wherein the battery pack includes a thermally conductive portion having a thermal conductivity of 10 W / mk or more, wherein the thermally conductive portion of the battery module and the thermally conductive portion of the battery pack are in thermal contact with the gap filler. .

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