KR20160052424A - Battery package including heat insulating film - Google Patents

Abstract

The present invention relates to a battery package comprising a heat insulation film. The battery package comprises: a battery pack in which a plurality of batteries are embedded; and a heat insulation film arranged inside the battery pack for selectively dividing the batteries, and for preventing or blocking the heat conductivity between the batteries. The battery package is capable of improving the durability and a function of an electronic device by blocking the movement of the heat generated inside the battery or the heat applied to the battery from the outside. In addition, the battery package is capable of preventing the leakage of an electrolyte inside the battery.

Description

[0001] The present invention relates to a battery package including a heat insulating film,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery package, and more particularly, to a battery package capable of accommodating a plurality of batteries and capable of preventing damage to the battery due to heat by having excellent thermal insulation between batteries.

2. Description of the Related Art Recently, with the digitization and high performance of electronic products, the development of a high capacity power supply device capable of satisfying a reduction in size, thickness, weight, and high energy density has been actively developed.

Therefore, recently, in order to satisfy the above-mentioned conditions, a lithium ion secondary battery, a lithium ion polymer battery, a super capacitor (electric double layer capacitor and a pseudo capacitor) having a high energy density and a large capacity Power supply is being developed.

Generally, batteries can be used to power electronic devices that require a high amount of energy. In order to supply a large amount of energy, a battery in which a plurality of batteries are connected in series or in parallel is generally housed in a battery pack to be used as one battery package.

In order to apply the power supply device of the package type described above to a miniaturized or thinned electronic device, a plurality of batteries are brought into close contact with each other and accommodated in the battery pack. However, the heat generated inside the battery or the heat applied to the battery from the outside is conducted through the adjacent battery, thereby deteriorating the function and durability of the electronic device. In addition, the heat generated as described above has a problem that gas is generated in the battery or thermal expansion of the electrolytic material causes electrolyte leakage.

KR 2014-0118264 A KR 2014-0121205 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a battery package capable of preventing the heat generated in the battery or the heat applied to the battery from being externally applied thereto to improve the function and durability of the electronic device It has its purpose.

It is another object of the present invention to provide a battery package that can prevent gas from being generated in a battery due to heat or thermal expansion of an electrolytic material, thereby preventing leakage of the electrolytic material to the outside of the battery.

In order to solve the above-described problems, the present invention provides a battery package. The battery pack includes: a battery pack having a plurality of batteries; And a heat insulating film disposed in the battery pack and selectively separating the batteries and preventing or blocking heat conduction between the batteries.

In addition, the heat insulating film may partition the batteries.

Further, the battery pack may have one side opened.

Further, an adhesive layer may be further included between the surface of the battery and the heat insulating film.

The adhesive layer may contain at least one selected from the group consisting of polyphthalate, acid-modified polypropylene (PPa), and acid-modified polyethylene (PEa).

In addition, the heat insulating film may include at least one of a porous substrate and a heat insulating film having a plurality of micropores capable of receiving air.

In addition, the porous substrate includes at least one substrate selected from the group consisting of a fibrous web, a nonwoven fabric, a fabric, and a knitted fabric, and the fibers forming the substrate may include at least one of organic fibers and inorganic fibers.

Also, the fibrous web is a nanofiber web formed through electrospinning, and the nanofibers forming the nanofiber web include polyacrylonitrile nanofiber, polyvinylidene fluoride nanofiber, polyacrylonitrile and polyvinylidene fluoride Rid < / RTI > composite nanofibers.

In addition, the composite nanofibers may be mixed with polyacrylonitrile and polyvinylidene fluoride in a weight ratio of 6: 4 to 8.5: 1.5 in monosaccharide.

In addition, the nanofiber web may have a basis weight of 2 to 6 g / m 2 and a porosity of 40% or more.

According to another aspect of the present invention, there is provided a battery pack comprising: a battery pack including at least one battery accommodation hole having a heat insulating film disposed on an inner surface thereof; And a battery accommodated in the battery receiving hole.

Finally, a battery package according to another aspect of the present invention includes a battery pack in which a battery and a heat insulating film are arranged alternately at least twice, and which packs the battery and the heat insulating film.

The battery package including the heat insulating film according to the present invention can prevent the heat generated in the battery or the heat applied to the battery from being externally applied, thereby improving the function and durability of the electronic device.

In addition, the battery package according to the present invention can prevent gas from being generated in the battery due to heat or thermal expansion of the electrolytic material, thereby preventing leakage of the electrolytic material to the outside of the battery.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a battery pack having a plurality of batteries therein according to an embodiment of the present invention;
2 illustrates a battery pack having a plurality of batteries therein according to another embodiment of the present invention.
FIG. 3 is a view illustrating a battery pack having a plurality of batteries according to another embodiment of the present invention. Referring to FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals designate like elements throughout the specification.

1 and 2, a battery package according to an embodiment of the present invention includes a battery pack 10 in which a plurality of batteries 15 are embedded, and a plurality of batteries 15 disposed in the battery pack 10, And a heat insulating film 13 for preventing or blocking heat conduction between the batteries 15. The battery package according to an embodiment of the present invention includes the heat insulating film 13 to prevent the heat generated inside the battery 15 or the heat applied to the battery from being externally applied to improve the function and durability of the electronic device . In addition, it is possible to prevent gas from being generated in the battery 15 due to heat or thermal expansion of the electrolytic material, and leakage of the electrolytic substance in the battery 15 can be suppressed.

The battery pack 10 serves to receive a plurality of batteries 15 connected in series or in parallel. The battery pack 10 can be used without limitation as long as it can have a predetermined shape capable of accommodating the batteries 15. [ For example, an insulating resin may be used as a material for forming the battery pack 10. As the insulating resin, at least one selected from the group consisting of a silicone resin, a fluororesin, and an acrylic resin can be used.

One side of the battery pack 10 may be opened. This is to connect various terminals that can be electrically connected to the battery 15 through the opened surface to transmit or receive the electric current to the outside.

The battery 15 may be a primary battery or a secondary battery. For example, the battery 15 may be a secondary battery capable of charging and discharging. At this time, the battery may have a shape of at least one of a cylindrical shape, a square shape, a coin shape, and a pouch shape. Although the battery pack of Fig. 1 includes three batteries 15, it is not limited thereto.

When the battery 15 is a secondary battery, an electrode assembly including an anode assembly and a cathode assembly disposed opposite to each other, a separator disposed between the anode assembly and the cathode assembly, and an electrolyte solution are received, And sealing the battery case housing the assembly.

First, the anode assembly and the cathode assembly are described as follows.

The positive electrode assembly and the negative electrode assembly may have a sheet shape suitable for a battery which may have a thin shape.

The cathode assembly may include a cathode current collector and a cathode active material coated on the cathode current collector, and the cathode assembly may include a cathode current collector and a negative electrode active material coated on the anode current collector.

The anode current collector and / or the anode current collector may be made of a thin metal foil and may be formed in a strip shape extending in one direction. The anode current collector and / or the anode current collector may be formed of a metal such as copper, aluminum, stainless steel, nickel, titanium, chromium, manganese, iron, cobalt, Molybdenum, tungsten, silver, gold, and combinations thereof.

The cathode current collector and / or the anode current collector is preferably formed to a thickness of 0.5 to 2 탆.

The positive electrode active material includes a positive electrode active material capable of reversibly intercalating and deintercalating lithium ions. Typical examples of the positive electrode active material include LiCoO ₂ , LiNiO ₂ , LiNiCoO ₂ , LiMnO ₂ , LiMn ₂ O ₄ , V ₂ O ₅ , V ₆ O ₁₃ , LiNi _{1 -x- y} Co _x M _y O ₂ (0 ≤ x ≤ 1, 0 ≤y ≤ 1, 0 ≤ x + y ≤ 1, M is Al, Sr, Mg , And La), and a lithium-transition metal oxide or an NCM (Lithium Nickel Cobalt Manganese) -based active material, and mixtures of at least one of them may be used, but the present invention is not limited thereto.

The negative electrode active material includes a negative electrode active material capable of intercalating and deintercalating lithium ions. Examples of the negative electrode active material include carbon-based negative electrode active material of crystalline or amorphous carbon, carbon fiber, or carbon composite, tin oxide, Lithium, lithium, a lithium alloy, and a mixture thereof. However, the present invention is not limited thereto.

Next, a composite porous separator capable of optimizing the impregnation property of the electrolyte can be applied to the separator. The composite porous separator may be a porous nonwoven fabric which is used as a matrix and has fine pores and a porous nanofiber web laminated with a thin film on both sides of the porous nonwoven fabric and formed of a spinnable polymer material and impregnated with an electrolytic solution.

Finally, the electrolyte is preferably a gel polymer electrolyte in the form of a gel impregnated in the pores of the separator, and it is possible to improve leakage of the existing liquid electrolyte, and particularly to prevent gas or leakage from occurring during bending.

The electrolytic solution may be an organic electrolytic solution containing a non-aqueous organic solvent and a solute of a lithium salt.

As the non-aqueous organic solvent, a carbonate, an ester, an ether or a ketone may be used. Examples of the carbonate include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC) Propylene carbonate (PC), butylene carbonate (BC) and the like can be used as the ester. Examples of the ester include butyrolactone (BL), decanolide, valerolactone, mevalonolactone Caprolactone, n-methyl acetate, n-ethyl acetate, n-propyl acetate and the like can be used. As the ether, dibutyl ether and the like can be used. As the ketone, polymethyl vinyl ketone However, the present invention is not limited to the kind of the non-aqueous organic solvent.

In addition, the electrolyte according to the present invention includes a lithium salt, which acts as a source of lithium ions in the battery to enable operation of a basic lithium battery, examples of which include LiPF ₆ , LiBF ₄ , LiSbF _{6 , LiAsF 6, LiClO 4, LiCF} 3 SO 3, LiN (CF 3 SO 2) 2, LiN (C 2 F 5 SO 2) 2, LiAlO 4, LiAlCl 4, LiN (C x F 2x + 1 SO 2) ( C _y F _{2x + 1} SO ₂ ) (where x and y are rational numbers), and LiSO ₃ CF ₃ .

Next, the heat insulating film 13 can selectively partition the batteries as shown in FIG. More preferably, the heat insulating film can partition the batteries. In this case, the batteries 15 can be accommodated in the partitioned space through the heat insulating film 13. In addition, it is possible to prevent the leaked electrolytic material from being transferred to another battery when the electrolytic material of any one of the plurality of batteries is leaked. In addition, when the electrolytic material of any one of the plurality of batteries is leaked, only the corresponding battery can be replaced, thereby reducing the maintenance cost.

The heat insulating film 13 may be formed as a thin film within a range in which the film is not damaged by an external force, and may be a known film having heat resistance capable of maintaining the shape at high temperature, for example, at 30 DEG C or more, The heat insulating member can be used without limitation. For example, the heat insulating film 13 may include a porous substrate and / or a heat insulating film having a plurality of micropores capable of receiving air.

The porous substrate may comprise one or more substrates selected from the group consisting of a fibrous web, a nonwoven fabric, a fabric and a knitted fabric. The fabric and the knitted fabric mean conventional fabrics in which the fibers are arranged with directional and / or regularity. Further, the fibrous web and the nonwoven fabric means a substrate formed by gathering fibers without having directionality, and the fibrous web forms a three-dimensional network structure by fusion between the fibers at the same time as the spinning, And the nonwoven fabric means a conventional nonwoven fabric prepared by adhering short fibers through a separate adhesive or heat. The fibers forming the porous substrate may be selected from the group consisting of cellulose, protein, polyester (PET, PBT), polyamide (nylon 6, nylon 66, etc.), acrylic (polyacrylonitrile, Inorganic fibers such as known organic fibers and / or glass fibers, rock wool fibers, including vinyl (polyvinyl alcohol, polyvinyl chloride) and fluorine (PVDF, PCTFE, PTFE, etc.) Fiber.

The heat insulating film 13 included in an embodiment of the present invention may be a fibrous web. When a fibrous web is used as a heat insulating film, there is an effect of absorbing the impact in the battery package in addition to the heat insulating effect. This is because the pores formed in the fibrous web block the propagation of the impact so that the impact is absorbed into the battery.

For example, the fibrous web may be a nanofiber web formed through electrospinning. The nanofibers forming the nanofiber web may include polyacrylonitrile nanofibers to have heat resistance. In addition, the nanofiber itself forming the nanofiber web may include polyvinylidene fluoride nanofibers in order to exhibit adhesiveness to improve durability and mechanical strength. Alternatively, the nanofibers may be composite nanofibers of polyacrylonitrile and polyvinylidene fluoride, through which heat resistance, durability through adhesiveness, and mechanical strength can be simultaneously exhibited. In this case, the composite nanofiber may be a composite nanofiber in which polyacrylonitrile and polyvinylidene fluoride are mixed in a weight ratio of 6: 4 to 8.5: 1.5 in a mono yarn. If the PAN and PVDF are contained in a ratio of less than 6: 4, the heat resistance is lowered and the pores of the nanofiber web are significantly decreased due to the melting of the nanofiber web during the adiabatic effect, This can be. In addition, if PAN and PVDF are contained in excess of the ratio of 8.5: 1.5, it is difficult to exhibit mechanical strength and durability, and since the proportion of PAN is high, the productivity may be poor due to remarkable radioactivity during electrospinning, It is difficult to fabricate a nanofiber web that exhibits sufficient adiabatic effect because it is difficult to realize pores and pores.

The average diameter of the nanofibers forming the nanofiber web may be 0.1 to 2 μm, preferably 0.1 to 1.0 μm. If the average diameter of the nanofibers is less than 0.1 μm, sufficient porosity is secured There may be a problem that the heat insulating property is deteriorated. If it exceeds 2 탆, there may be a problem that the void formed by the nanofiber is too large and the heat insulating property is deteriorated.

In addition, the nanofiber web may have a basis weight of 2 to 6 g / m 2, a porosity of 40% or more, more preferably 40 to 80%, and an average pore size of 300 to 400 μm , Whereby the desired adiabatic effect can be expressed to be further improved. If the porosity exceeds 80% and / or the average pore size exceeds 400 탆, the mechanical strength of the nanofibrous web may be weak and it may not be able to function properly as a heat insulating film.

The heat insulating film may be a known heat insulating film, a film having an air bag inside the film, or a known heat insulating film exhibiting an adiabatic effect in a state in which air is not contained in the film, It is not particularly limited to a specific kind.

The heat insulating film 13 is preferably formed to have an average thickness of 10 탆 to 50 탆, preferably an average thickness of 15 탆 to 40 탆, more preferably 15 탆 to 35 탆. At this time, if the average thickness of the heat insulating film is less than 10 탆, there is a problem that the desired heat insulating effect can not be exhibited, and when it exceeds 50 탆, it is not economical and may not be preferable in manufacturing a slimmed flexible battery.

In addition, the heat insulating film 13 included in one embodiment of the present invention may be a structure in which the first heat insulating film and the second heat insulating film are laminated, wherein the first heat insulating film may be the nanofiber web described above, The membrane may be a nonwoven fabric. At this time, the thickness of the nanofiber web may be 3 to 10 mu m, and the thickness of the nonwoven fabric may be 10 to 40 mu m. At this time, the nonwoven fabric may serve as a heat insulating film, and at the same time, it may serve to improve the durability of the heat insulating film by compensating the mechanical strength of the laminated nanofiber web.

Meanwhile, an adhesive layer (not shown) may further be provided between the surface of the battery 15 and the heat insulating film 13. The adhesive layer enhances the adhesion between the battery 15 and the battery pack 10. At the same time, when the electrolyte leaks from the battery due to surface damage of the battery 15, the adhesive layer can prevent the electrolyte from leaking from the battery by blocking the surface damage. The adhesive layer may include at least one selected from silicone, polyphthalate, acid modified polypropylene (PPa), and acid modified polyethylene (PEa). More preferably at least one selected from the group consisting of acid modified polypropylene (PPa) and acid modified polyethylene (PEa). The acid-modified polypropylene and the acid-modified polyethylene may be polypropylene or polyethylene containing 0.1 to 10 wt% of an acid component such as maleic acid, acrylic acid and organic peroxide in the polymer, and if the content of the acid component satisfies the above range The desired level of adhesive force between the surface of the battery 15 and the heat insulating film 13 can not be developed, so that interlayer peeling frequently occurs and electrolyte leakage may occur.

The adhesive layer may be a dry lamination layer. In this case, the adhesive strength between the battery 15 and the battery pack 10 can be further enhanced.

At this time, the adhesive layer may have an average thickness of 5 탆 to 30 탆, preferably 10 탆 to 20 탆. This is because if the average thickness of the first adhesive layer exceeds 5 mu m, it may be difficult to stably secure the adhesive strength, and if it exceeds 30 mu m, it is disadvantageous for thinning.

The same components as those of the above-described embodiment of the present invention among the constituent elements of the present embodiment are denoted by the same reference numerals of FIGS. 1 and 2, and a detailed description thereof will be omitted.

The battery pack according to another embodiment of the present invention includes a battery pack 10 including at least one battery receiving hole 11 having a heat insulating film 13 disposed on an inner surface thereof as shown in FIG. 3, And a battery 15 accommodated in the battery 11. In this case, since the heat insulating film 13 is disposed on the inner surface of the battery receiving hole 11, the heat generated from the battery accommodated in the battery receiving hole 11 can be prevented or prevented from being conducted.

At this time, an adhesive layer (not shown) may be further provided between the battery pack 10 and the heat insulating film 13 as in the above-described embodiment.

According to another aspect of the present invention, there is provided a battery pack comprising a battery pack and a heat insulating film disposed alternately at least twice, the battery pack packing the battery and the heat insulating film. At this time, the battery is preferably in the form of a hexahedron or a film having a predetermined thickness as shown in FIG. As the battery and the heat insulating film are alternately arranged, heat conduction between adjacent batteries in the heat insulating film is suppressed or blocked.

Hereinafter, exemplary embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are intended to aid understanding of the present invention, and the present invention is not limited by the following experimental examples.

≪ Example 1 >

A battery pack having a hexahedral shape with one side opened using a plate containing a silicone resin was produced.

Next, a thickness of 25 탆 produced by electrospinning a spinning solution mixed with PAN (DOLAN, N-PAN, weight average molecular weight 85,000 g / mol) and PVDF (Solvary / Solef 5130) at a weight ratio of 8: As shown in Fig. 1, a battery accommodation space is provided inside the battery pack using an adhesive (3M, acrylic adhesive) of a nanofiber web thermal insulating film having a basis weight of 4.6 g / m 2, a porosity of 65%, and an average pore size of 330 탆 And the inside of the battery pack was partitioned and fixed.

Next, in order to manufacture a battery, a cathode assembly and a cathode assembly were first prepared. The positive electrode assembly was prepared by casting a positive electrode current collector made of aluminum having a thickness of 20 탆 on both sides of a positive electrode current collector such that a final thickness of 120 탆 was formed by a negative electrode active material of NCM (Lithium Nickel Cobalt Manganese). Also, the negative electrode assembly was made by casting a graphite negative electrode active material on a copper negative electrode current collector having a thickness of 15 탆 on both sides of a negative electrode current collector so as to have a final thickness of 115 탆. Then, a separation membrane having a thickness of 20 mu m made of PET / PEN material was prepared, and an electrode assembly was manufactured by laminating the anode assembly, the separation membrane and the cathode assembly. Then, the prepared electrode assembly and LiPF ₆ After the electrolyte solution was received, the battery case containing the electrode assembly was sealed using a cap plate to produce three batteries in total.

Next, the batteries were accommodated in the three battery accommodating spaces of the previously manufactured battery pack.

Next, a battery package was prepared by filling a PPa adhesive between the battery and the heat insulating film and dry-laminating the same to form an adhesive layer between the battery and the heat insulating film.

≪ Examples 2 to 3 >

The PAN and PVDF contents of the nanofiber web used as a heat insulating film were prepared in the same manner as in Example 1, and the insulating films were prepared as shown in Table 2 below. .

<Example 4>

Compared with Example 1, a battery package was manufactured under the same conditions except that the PAN and PVDF mixed spinning solution was electrospun on the PEN nonwoven fabric to form the heat insulating film, thereby manufacturing a nonwoven fabric and a nano-fiber web integral heat insulating film.

&Lt; Example 5 >

A battery package was manufactured in the same manner as in Example 1 except that no adhesive layer was formed as compared with Example 1.

&Lt; Comparative Example 1 &

A battery package was fabricated in the same manner as in Example 1 except that the heat insulating film was omitted, thereby manufacturing a battery package as shown in Table 2 below.

<Experimental Example 1>

The battery on the leftmost side of the battery package manufactured through Examples 1 to 5 and Comparative Example 5 was taken out and brought into contact with a heat source of 150 ° C for 30 minutes and then stored in the battery pack. The following properties were evaluated in order to evaluate the performance change of the batteries arranged in Table 2 below.

1. A fully charged battery was fully charged in an environment of a temperature of 25 ° C and a humidity of 65%, and the charge capacity was measured. Then, the battery was completely discharged again and recharged. However, if the charge capacity was 0 mAh before 100 runs, the average of the charge capacities measured until the first 0 mAh was measured was calculated. The charging and discharging conditions are shown in Table 1 below.

Charging conditions Normal Current 0.2C Max. Current 0.5 C CC-CV 4.2V Cut-Off 0.05C Discharge condition
Normal Current 0.2C Max. Current 0.5 C Cut-off Voltage 2.8V

2. Durability 1

The cross section of the batteries in the battery package was observed with an optical microscope to evaluate whether leakage of the electrolyte occurred.

3. Durability 2

The process of dropping the battery pack at a height of 1 m from the ground was repeated to record the number of times the battery pack was dropped when the battery was detached from the battery pack.

As can be seen from the results of Table 2, Example 1 in which PAN and PVDF were applied as a heat insulating film to a nanofiber web electrospun with a spinning solution mixed in a weight ratio within the preferred range of the present invention has excellent charging characteristics Able to know.

On the contrary, in Example 2 in which the PAN was included in the spinning solution in the spinning solution, the average charge capacity of Example 2 was significantly lower than that in Example 1 because PAN had a poor electrospinning property and the fiber length was very short, As the fibers are electrospun in the same state, the prepared nanofiber web layer has not been produced with a high porosity and the average pore size is very small, which is interpreted as a result that the adiabatic effect is significantly lowered than in Example 1. In the case of Example 2, no leakage occurred as a result of the durability evaluation, but it is expected that an abnormality occurred in the electrode assembly due to the decrease in the average charging capacity. Also, since the adhesion between the battery pack and the battery is weakened, it can be confirmed that the battery pack and the battery have been lifted and separated after the battery has fallen.

On the other hand, in Example 3 using a nanofiber web having a higher PVDF content as a heat insulating film, the average charge capacity was significantly lower than that of Example 1 and Example 2. This is because the PVDF of the heat insulating film was partially melted, It can be interpreted as a result of failing to perform the function of the insulating film properly. However, even in the case of Example 3, it is expected that the leakage of the liquid does not occur and that the electrode assembly is deteriorated in physical properties due to severe thermal damage.

In Comparative Example 1 in which the heat insulating film was not provided on the casing, it was confirmed that the battery pack had an average filling capacity of only 30 mAh after the insert molding process, and the durability evaluation result was leaky and the durability was remarkably poor. It is clearly shown that the function of the battery is deteriorated and the failure occurs in a state in which the heat insulating film is not provided.

In addition, in Example 4 in which an adhesive layer was formed between the heat insulating film and the battery, it was found that both the electrical characteristics and the mechanical properties were excellent as compared with the other examples.

&Lt; Example 6 >

PPa, which is an adhesive layer, was applied on a PET substrate under the same conditions as in Example 1 without a battery manufacturing process to form an adhesive layer. Then, a heat insulating film prepared under the same conditions as in Example 1 was adhered onto the adhesive layer. Thereafter, the adhesive structure in the form of an adhesive layer / adiabatic film was removed from the substrate.

&Lt; Example 7 >

An adhesive structure was prepared under the same conditions except that PP was used as the adhesive layer as compared with the above-mentioned Example 6. [

<Experimental Example 2>

It was observed whether the insulation film peeled off when the electrolyte leaked depending on the material contained in the adhesive layer.

Specifically, LiPF ₆ After the temperature of the electrolytic solution was raised to 250 ° C, the adhesive structures prepared in Examples 6 and 7 were impregnated for 10 minutes, and then peeling off of the adhesive layer and the heat insulating film was observed and the results are shown in Table 3 below.

Example 6 Example 7 Adhesive layer PPa PP Whether or not peeling × ○

Referring to Table 3, it was confirmed that the adhesive layer and the heat insulating film were peeled in the case of Example 7 using the PP adhesive layer in the electrolytic solution at a high temperature, and the peeling of the adhesive layer and the single-layer film did not occur in the case of Example 6 .

If PPa is used as the adhesive layer, it can be seen that the insulating film is stably bonded from the adhesive layer without peeling off even if the electrolytic solution is inflated and leaked by the internal heat of the battery.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that the present invention, Various modifications and variations are possible.

10: Battery pack 11: Battery receiving hole
13: adiabatic film 15: battery

Claims (12)

A battery pack having a plurality of batteries built therein; And
And a heat insulating film disposed in the battery pack and selectively separating the batteries and preventing or blocking heat conduction between the batteries. The method according to claim 1,
Wherein the heat insulating film separates the batteries from each other. The method according to claim 1,
Wherein the battery pack has one side opened. The method according to claim 1,
Further comprising an adhesive layer between the surface of the battery and the insulating film. 5. The method of claim 4,
Wherein the adhesive layer contains at least one selected from polyphthalate, acid-modified polypropylene (PPa), and acid-modified polyethylene (PEa). The method according to claim 1,
Wherein the heat insulating film includes at least one of a porous substrate and a heat insulating film having a plurality of micropores capable of accommodating air. The method according to claim 6,
Wherein the porous substrate includes at least one substrate selected from the group consisting of a fibrous web, a nonwoven fabric, a fabric and a knitted fabric, and the fibers forming the substrate include at least one of organic fibers and inorganic fibers. 8. The method of claim 7,
The fibrous web is a nanofiber web formed through electrospinning,
Wherein the nanofiber forming the nanofiber web comprises at least one of a polyacrylonitrile nanofiber, a polyvinylidene fluoride nanofiber, and a composite nanofiber of polyacrylonitrile and polyvinylidene fluoride. 9. The method of claim 8,
Wherein the composite nanofiber is a mixture of polyacrylonitrile and polyvinylidene fluoride in a weight ratio of 6: 4 to 8.5: 1.5 in a mono yarn. 9. The method of claim 8,
The nanofiber web has a basis weight of 2 to 6 g / m 2 and a porosity of 40% or more. A battery pack including at least one battery housing hole in which a heat insulating film is disposed on an inner surface; And
And a battery accommodated in the battery accommodating hole. A battery package comprising a battery and a heat insulating film arranged alternately at least twice and a battery pack packed with the battery and the insulating film.

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