JP5424176B2 - Laminated material for secondary battery container and secondary battery container - Google Patents

Description

  The present invention relates to a laminate material used for a secondary battery, and more particularly to a laminate material excellent in vibration resistance used as a secondary battery container or exterior material and a secondary battery container using the same.

  The introduction of electric vehicles, hybrid vehicles, electric motorcycles, and the like has been promoted against the background of the increasing environmental protection movement. For these, utilization of lithium ion secondary batteries is considered promising.

  As an outer packaging material for a lithium ion secondary battery, a laminate material having an aluminum foil as a barrier structure is being used. The required performance includes i) extremely low water vapor permeability, ii) no leakage of internal electrolyte, iii) excellent anti-electrolytic properties, and no delamination (peeling) of the inner layer film over time. Iv) Capable of being press-molded, and no pinholes or cracks in the aluminum foil after molding, v) No cracking in the inner layer film after molding, and no conduction between the lead wire and the aluminum in the laminate when creating the battery Vi) having heat resistance that temporarily withstands high temperatures such as 110 ° C., and the like.

  The laminated material satisfying these is a laminated material in which an exterior resin film / first adhesive layer / chemical conversion treated aluminum foil / second adhesive layer / sealant film are laminated, and the sealant film is an α-olefin. And a random copolymer of propylene and α-olefin having a content of 2 to 10% by weight. As a lubricant, erucic acid amide or oleic acid amide is 500 to 2500 ppm, and ethylenebisoleic acid amide is 500. A laminate for a secondary battery container characterized by containing ˜2500 ppm (Patent Document 1), a laminate comprising an exterior resin film / adhesive layer / chemical conversion treated aluminum foil / primer layer / sealant film, Propylene and α-olefin in which the sealant film has an α-olefin content of 2 to 10% by weight A laminate for a secondary battery container, comprising a random copolymer of 2 to 40% by weight of an elastomer or polybutene and containing at least 0.5% by weight of a lubricant. (Patent Document 2) and the like have been proposed and put into practical use.

  In addition, as a packaging bag for electronic components, it is a packaging bag to prevent deterioration due to static electricity damage and humidity, and when the electronic component is stored inside the bag, the electronic component edge hits strongly, When transporting electronic parts in a bag, the thermoplastic resin layer (A) is easy to break with electronic parts and external protrusions, and has improved so-called piercing resistance, with a metal foil sandwiched on one side. Also, a laminated film in which the thermoplastic resin layer (B) is laminated on the other side, the metal foil and the thermoplastic resin layer are bonded together by extrusion lamination, and the tensile strength of the thermoplastic resin layer (A) is increased. When Sa, the elongation at break is Ea, the tensile strength of the thermoplastic resin layer (B) is Sb, and the elongation at break is Eb, the thermoplastic resin layer (A) and the thermoplastic resin layer (B) are The tensile strength ratio is Sa / Sb = 1. 2 to 1/20, the elongation ratio is Ea / Eb = 1 / 0.8 to 1 / 0.01, and at least one of the thermoplastic resin layer (A) and the thermoplastic resin layer (B) In addition, a laminated film for packaging electronic parts (Patent Document 3) in which a heat sealing material layer is laminated on the surface opposite to the metal foil has been proposed and can be used as a laminated material for a secondary battery container. .

JP 2003-288865 A JP 2003-288866 JP Japanese Unexamined Patent Publication No. 7-76375

  However, when these secondary battery container laminates are used in electric vehicles, hybrid vehicles, and electric motorcycles, the exterior laminate material is cracked or torn by vibration during road driving, and the internal electrolyte solution There is a risk of leakage or electrolyte dispersion. Further, the exterior material may be broken by an impact when the automobile collides, or the power generation element inside may jump out and destroy the exterior material.

  The problem of the present invention is that the outer layer laminated material is not cracked or torn even by vibration during road running, there is no risk of internal electrolyte leakage, scattering, or when an automobile collides, etc. It is to provide a laminate for a secondary battery container and a container in which the exterior laminate is not destroyed even by the impact of.

The present inventors have made intensive studies in order to solve the above problems, a polyethylene terephthalate, of poly ethylene naphthalate or polylactic acid film (A), a nylon 6 film (B), aluminum foil (C), a polypropylene film (D) is a laminated material laminated in this order, A is a biaxially stretched film, B and D are unstretched films, and the thickness of C is 80 to 250 μm It has been found that a laminated material for a secondary battery having better vibration resistance and impact resistance than conventional materials can be produced by using the material, and the present invention has been completed.

  Moreover, it is preferable that the breaking strength of A is 150 to 250 MPa, and the breaking elongation is 100 to 150%.

  Furthermore, this invention is the secondary battery container formed with the laminated material for secondary batteries described above.

  According to the present invention, the secondary battery container of the present invention is excellent in vibration resistance and impact resistance, and even if mounted on an electric vehicle, a hybrid vehicle, an electric motorcycle, etc. There is no risk of the material cracking or tearing, leaking the internal electrolyte, splashing, or jumping out the internal power generation element.

  The present invention will be described in detail below.

In the present invention, polyethylene terephthalate, of poly ethylene naphthalate or polylactic acid film (A) and (hereinafter, sometimes simply referred to as A.), Was polymerized by ester bonds as main components terephthalic acid and ethylene glycol polyethylene terephthalate, high 2,6-naphthalene dicarboxylic acid and ethylene glycol poly ethylene naphthalate, or polymerized by an ester bond as a main component, lactic polylactic acid which is polymerized by an ester bond, which is molecularly oriented by biaxial stretching It is a strong polyester film, and a known one can be used.

In the present invention, polyethylene terephthalate, unless using poly ethylene naphthalate, or consisting of biaxially stretched polylactic acid film (A), a nylon 6 film for protecting aluminum foil (C) (B) is at vibration from the outside force It is unfavorable because it wears away quickly and tears.

  The breaking strength of A is preferably 150 to 250 MPa, and the breaking elongation is preferably 100 to 150%, more preferably the breaking strength is 160 to 240 MPa and the breaking elongation is 110 to 130%.

  If the breaking strength is 150 MPa or more, the exterior is not easily deformed by the force of vibration from the outside of the battery, it is difficult to crack, it is difficult to break, and the breaking strength is 250 MPa or less, the processing when molding the battery container This is preferable because the characteristics (drawability) are good.

  When the breaking elongation is 100% or more, the processing characteristics (squeezability) when the battery container is molded are good, and when the breaking elongation is 150% or less, the exterior is cracked due to the vibration force inside the battery. Is less likely to enter and is not easily broken, and therefore, the elongation at break is more preferably from 100 to 150%.

  When the thickness of A is thicker than 5 μm, the outer layer is not easily torn when the electrolyte adheres during molding of the battery container, and when it is thinner than 40 μm, the processing characteristics (drawability) are good. 40 μm is more preferable.

  In the present invention, a known nylon 6 unstretched film obtained by a T-die method or the like is used as the nylon 6 film (B) (hereinafter sometimes simply referred to as B).

  If B is a stretched film, the film is fragile, and the exterior is likely to be broken by the force of vibration from the outside of the battery, such being undesirable.

  When the thickness of the nylon 6 film (B) is thicker than 10 μm, A is difficult to break, and when it is thinner than 30 μm, the processing characteristics (drawability) are good. Therefore, the thickness of B is more preferably 10-30 μm.

  As the aluminum foil (C) in the present invention (hereinafter sometimes abbreviated as C), a known aluminum foil can be used, and a known pure aluminum or aluminum alloy can be used as its component. The thickness of the aluminum foil (C) needs to be 80 to 250 μm, and more preferably 90 to 200 μm. If the thickness is less than 80 μm, the aluminum foil is also easily broken by the impact force from the outside due to the impact when the automobile collides and the impact force of the power generating element in the container, which is not preferable. On the other hand, when the thickness exceeds 250 μm, there is no problem in impact properties, but it is not preferable in terms of cost, flexibility, moldability, and weight increase as materials. The purity of aluminum is not particularly limited, and known ones such as industrial pure aluminum and alloys such as (JIS) 3003, 3004, 5052, 8021, and 8079 can be adopted, but at least one component selected from manganese, iron, and silicon Is preferably contained in an amount of 1.0% by weight or more. The upper limit is not particularly limited, but is about 2.0% by weight for manufacturing foil. By including 1.0% by weight or more of manganese, iron, or silicon, the stiffness (rigidity) of the laminated material is improved and it is effective in preventing pinholes and cracks. As for the tempering, any of an annealed material, a rolled material, and an intermediate material thereof can be applied and can be appropriately selected according to required characteristics. However, an annealed material is preferable in terms of formability, adhesiveness, and the like. Moreover, it is preferable to wash with water, a detergent, an acid, an alkali, an organic solvent, etc. as needed.

  In the present invention, a known unstretched polypropylene film can be used as the polypropylene film (D) (hereinafter sometimes simply referred to as D).

  A non-stretched film is preferable because the heat seal temperature is lower than that of a stretched film, and the secondary battery container is easily formed by heat sealing. This is because in the case of non-stretching, the entanglement of polypropylene molecules easily proceeds during sealing.

  As for the film thickness of D, when the thickness is 25 μm or more, the sealing strength for molding the battery container is improved, the seal is difficult to peel off, liquid leakage is difficult to occur, and the thickness is 100 μm or less. When it exists, since the unstretched polypropylene film of the said thickness is easy to obtain on the market, it is more preferable that thickness is 25-100 micrometers.

  The laminated material for secondary battery containers of the present invention must be laminated in the order of A / B / C / D. Since D has a function of overlapping and sealing D and D when the laminated material is formed as a battery container, it needs to be the innermost layer. Aluminum foil C needs to be laminated on D so as to avoid vibration and impact from the outside of the bag as much as possible and to be inside the outermost layer as much as possible so as not to be oxidized by external oxygen. is there. In order to protect C from external force, it is necessary to provide B on C and to provide A on the outermost layer so that B does not rub against the outside and wear.

  If A is not used for the outermost layer but B / A / C / D and B / C / A / D, B will be worn away by friction with the outside, and the battery container will be torn immediately. When C is laminated second from the outermost layer, such as A / C / B / D, external vibration is not absorbed by the aluminum foil, but cracks are immediately formed in C, and the battery container is easily torn. When C is laminated on the outermost layer, C is deformed immediately by an external force, wears down, and is easily broken, which is not preferable.

  Although the manufacturing method of the laminated material of this invention is not specifically limited, It can form with the following method.

Polyethylene terephthalate, can be bonded by dry lamination consists of poly ethylene naphthalate or polylactic acid film (A) and nylon 6 film (B) and aluminum foil (C) and a polypropylene film (D). Specifically, A and B are bonded to form an A / B laminated material, C is bonded to the B side to form an A / B / C laminated material, and the C side and D are laminated to form A / B / C / D. A laminated material can be obtained. Alternatively, A and B are bonded to form an A / B laminated material, and C and D are laminated separately to form a C / D laminated material, and A and B laminated material and C / D laminated material are laminated and bonded to B and C. A / B / C / D laminates can be manufactured.

  As an adhesive in the dry laminating method, an ordinary two-component type of a polyol main agent and an isocyanate curing agent can be used. Specific examples include Takelac (polyol main agent) / Takenate (isocyanate curing agent) two-component type manufactured by Mitsui Chemicals Polyurethanes. It can also be bonded by extrusion / coating lamination. As the extrusion / coating resin, various polyethylene, polyolefin resin, polyamide, polyester, eval, polymethylpentene, acid-modified resin and the like are used. As a specific example of the acid-modified resin, “Modic” manufactured by Mitsubishi Chemical Corporation can be used. As the polyester resin, polyethylene terephthalate is preferable.

  The aluminum foil (C) and the polypropylene film (D) can be laminated by using a layer obtained by melt-extrusion of a modified polyolefin, which is a polyolefin having a functional group component, as a sandwich layer between C and D, and laminating C and D. it can. Alternatively, a film made of modified polyolefin can be laminated between C and D, heated and pressurized, and C and D can be laminated by a thermal laminating method. As the modified polyolefin, functional groups having an affinity for aluminum such as amino group, carboxyl group, hydroxyl group, maleic anhydride group, silane group, acrylic acid group, and acrylate group are introduced into polyolefin such as polyethylene and polypropylene. Known olefin copolymers such as olefin copolymers obtained by polymerizing olefins such as ethylene and propylene as main monomers and comonomers such as acrylic acid, vinyl acetate, glycidyl methacrylate and methyl acrylate are used.

For the secondary battery container, two laminated material pieces are cut out from the laminated material of the present invention, stacked so that the polypropylene film (D) is on the inside, and the three sides are fused by heat sealing to form a bag. Can be created. It can also be made by cutting out one laminated material, bending one end so that the polypropylene film (D) is inside, and fusing two sides of the side by heat sealing to create a bag.

The secondary battery container, cut out two sheets of laminate material pieces from laminated material of the present invention, as one polyethylene terephthalate laminate, comprising poly ethylene naphthalate or polylactic acid film (A) is on the outside The container is formed by drawing with a mold and overlaying a molding material provided with a drawing part for enclosing a power generation element and another laminated material on the polypropylene (D) side and fusing by heat sealing. Can be created.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited only to these Examples. Each characteristic value was measured by the following method.

(1) Breaking strength, breaking elongation, Young's modulus Using a tensile tester (Tensilon), the crosshead speed is 300 mm / min, the width is 10 mm, and the sample length is 50 mm. In accordance with JIS-K7127 (1999), the breaking strength, breaking elongation, and Young's modulus values were measured. In the evaluation, the breaking strength, breaking elongation, and Young's modulus in each of the longitudinal direction and the width direction were measured 5 times each, and an average value in the longitudinal direction and the width direction was used.

(2) Film thickness Film thickness was measured at 30 g of needle pressure using an electronic micrometer (trade name “K-312A type” manufactured by Anritsu Corporation).

(3) Aluminum foil thickness The thickness of the aluminum foil in the laminated material is embedded in an epoxy resin (trade name “Epomount” manufactured by Refine Tech Co., Ltd.) with a small piece (2 mm × 2 mm) of the laminated material. Then, the entire embedded resin was sliced to a thickness of 50 nm using a microtome, and obtained by observing with a transmission optical microscope (“Eclipse E100” manufactured by Nikon Instruments Co., Ltd.) at a magnification of 500 times.

(4) Vibration resistance Two 20 cm × 15 cm laminated material pieces are cut out from the laminated material of the present invention, and a drawing molded portion for enclosing a power generation element having a depth of 10 cm × 5 cm and a depth of 5 mm from one laminated material is a polyester film. Using a mold having a long side of 10 cm, a short side of 5 cm, a corner of 2 mm, a die shoulder R of 1.2 mm, and a punch shoulder of 0.5 mm so that (A) is on the outside, a press pressure of 7 kg / cm ² is applied, and the molding depth After forming into a 5 mm-thick container shape, 20 g of the following test solution is put into the container portion, and an aluminum plate (3 mm thickness × 6 cm × 5 cm) is put as a battery structural body simulation body. The container was made by stacking so that the polypropylene film (D) was on the inside and fusing the four sides by heat sealing.

  The test solution used was ethylene carbonate / ethylene methyl carbonate = 1/1 (weight ratio) to which lithium hexafluorophosphate (concentration 1.5 N) was added.

  This heat seal sample was used to fix to a vibration testing machine (“BF-50UD” manufactured by IDEX Co., Ltd.), and at room temperature, the amplitude was 0.75 mm (longitudinal direction), 10 Hz → 55 Hz → 10 Hz was swept in 60 seconds. The heat seal sample was broken for 8 hours and the state of the liquid leakage was visually observed and evaluated according to the following criteria. ○, ○ to Δ and Δ are practical ranges, and × and XX are Outside the practical range.

  ○: No tearing, no leakage change observed.

  ○ to Δ: There is no liquid leakage in the container, but a slight crack is observed.

Δ: No visible cracks or tears in the bag, but slight leakage is observed.
X: Cracks are clearly seen in the bag, and liquid leakage has occurred.
XX: The bag is torn and most of the liquid is leaking.

(5) Impact resistance The test solution / aluminum plate enclosure created in (4) above is repeatedly dropped from a height of 5 meters onto a marble test table with the long and short sides facing down. (Equivalent to a collision of 35 km / h).
The container was observed to be broken and leaked after being dropped repeatedly 100 times, and evaluated according to the following criteria: ○, ○ to Δ and Δ are practical ranges, and x and xx are outside practical ranges It was.
○: No tearing, no leakage change observed.
○ to Δ: There is no liquid leakage in the container, but a slight crack is observed.
Δ: Slight cracks are observed in the container, and slight leakage is observed.
X: Cracks are clearly seen in the container, and liquid leakage occurs from there.
XX: The container is broken and most of the liquid leaks.

[Example 1]
Biaxially stretched polyethylene terephthalate film (A) having a thickness of 12 μm, a breaking strength of 240 MPa, and a breaking elongation of 118% (“Lumirror” (registered trademark) P60 manufactured by Toray Industries, Inc.), a thickness of 15 μm, a breaking strength of 103 MPa, A non-stretched nylon 6 film (B) having a breaking elongation of 398% ("Rayfan" (registered trademark) NO 1401 manufactured by Toray Film Processing Co., Ltd.) is dried by a laminate method, and "Takelac A-" manufactured by Mitsui Chemicals Polyurethane Co., Ltd. is used. A / B laminates were prepared using a "910 (polyol-based main agent)" / "Takenate A-3 (isocyanate-based curing agent)" two-component (100 parts by weight / 10 parts by weight) adhesive. Here, the adhesive coating amount was 5 g / m ² on the A side as a solid content, and after the A / B bonding, an aging treatment was performed at 40 ° C. for 72 hours.

A / B laminate and aluminum foil (C) with a thickness of 110 μm (“Vespa” 8021 manufactured by Sumikara Aluminum Foil Co., Ltd.), B and C are overlaid and manufactured by Mitsui Chemicals Polyurethane Co., Ltd. by a dry laminating method. “Takelac A-910 (polyol-based main agent)” / “Takenate A-3 (isocyanate-based curing agent)” two-component type (100 parts by weight / 10 parts by weight) adhesive is used to create an A / B / C laminate. did. Here, the amount of adhesive applied was 6 g / m ² as a solid content on the B side, and after B / C bonding, an aging treatment was performed at 45 ° C. for 80 hours.

  An A / B / C laminate having an unstretched polypropylene film (D) having a breaking strength of 40 MPa, a breaking strength of 38 MPa, a breaking elongation of 500%, and a Young's modulus of 585 MPa (“Pyrene Film-CT P1128” manufactured by Toyobo Co., Ltd.) ) Was extruded at a melting temperature of 140 ° C. with a thickness of 10 μm (Mitsui Chemicals Co., Ltd., functional group graft-modified polypropylene “Admer QE840”) for the sandwich layer between C and D, and laminated. An A / B / C / D laminate of the invention was made. The characteristics are shown in Table 1.

[Example 2]
Instead of the biaxially stretched polyethylene terephthalate film (A) in Example 1, a biaxially stretched polylactic acid film having a thickness of 15 μm, a breaking strength of 160 MPa, and a breaking elongation of 128% (“Terramac” TF manufactured by Unitika Ltd.) was used. A / B / C / D laminate was prepared in the same manner as in Example 1 except that it was used. The characteristics are shown in Table 1.

[Example 3]
In Example 1, a biaxially stretched polyethylene terephthalate film (A) having a thickness of 25 μm, a breaking strength of 225 MPa, and a breaking elongation of 150% was used except that a biaxially stretched polyethylene terephthalate film (“Embret” manufactured by Unitika Ltd.) was used. Produced an A / B / C / D laminate in the same manner as in Example 1. The characteristics are shown in Table 1.

[Example 4]
In Example 1, a biaxially stretched polyethylene terephthalate film (A) having a thickness of 38 μm, a breaking strength of 216 MPa, and a breaking elongation of 110% was used (“Ester film E5100” manufactured by Toyobo Co., Ltd.). Except for this, an A / B / C / D laminate was prepared in the same manner as in Example 1. The characteristics are shown in Table 1.

[Example 5]
Instead of the biaxially stretched polyethylene terephthalate film (A) in Example 1, a biaxially stretched polylactic acid film having a thickness of 35 μm, a breaking strength of 150 MPa, and a breaking elongation of 120% (“Terramac TF” manufactured by Unitika Ltd.) was used. A / B / C / D laminate was prepared in the same manner as in Example 1 except that it was used. The characteristics are shown in Table 1.

[Example 6]
In Example 1, a biaxially stretched polyethylene terephthalate film (A) having a thickness of 6.5 μm, a breaking strength of 275 MPa, and a breaking elongation of 118% (“Lumirror” manufactured by Toray Film Processing Co., Ltd. (registered) (Trademark) A / B / C / D laminate was prepared in the same manner as in Example 1 except that P375) was used. The characteristics are shown in Table 1.

[Example 7]
In Example 1, a biaxially stretched polyethylene terephthalate film (A) having a thickness of 4.5 μm, a breaking strength of 271 MPa, and a breaking elongation of 106% (“Lumirror” (registered trademark) manufactured by Toray Industries, Inc.) An A / B / C / D laminate was prepared in the same manner as in Example 1 except that F53) was used. The characteristics are shown in Table 1.

[Example 8]
Instead of the biaxially stretched polyethylene terephthalate film (A) in Example 1, a biaxially stretched polyethylene naphthalate film having a thickness of 12 μm, a breaking strength of 310 MPa, and a breaking elongation of 85% (“Teonex” manufactured by Teijin DuPont Films Ltd.) An A / B / C / D laminate was prepared in the same manner as in Example 1 except that Q51) was used. The characteristics are shown in Table 1.

[Example 9]
In Example 1, as the biaxially stretched polyethylene terephthalate film (A), a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm, a breaking strength of 235 MPa, and a breaking elongation of 95% (“Ester Film” E5100 manufactured by Toyobo Co., Ltd.) A / B / C / D laminate was prepared in the same manner as in Example 1 except that it was used. The characteristics are shown in Table 1.

[Example 10]
In Example 1, as the biaxially stretched polyethylene terephthalate film (A), a biaxially stretched polyethylene terephthalate film having a thickness of 16 μm, a breaking strength of 285 MPa, and a breaking elongation of 125% (“Teijin Tetron Film” G2 manufactured by Teijin DuPont Films Ltd.) ) Was used in the same manner as in Example 1 except that A / B / C / D laminated material was prepared. The characteristics are shown in Table 1.

[Example 11]
In Example 1, as A, a biaxially stretched polyester film (A) having a breaking strength of 205 MPa and a breaking elongation of 95% (“Ester film E7700” manufactured by Toyobo Co., Ltd.) having a thickness of 12 μm was used. Except for this, an A / B / C / D laminate was prepared in the same manner as in Example 1. The characteristics are shown in Table 1.

[Example 12]
In Example 1, an A / B / C / D laminate was prepared in the same manner as in Example 1 except that the thickness was set to 250 μm as C. The characteristics are shown in Table 1.

[Example 13]
In Example 1, an A / B / C / D laminate was prepared in the same manner as in Example 1 except that the thickness of C was 80 μm. The characteristics are shown in Table 1.

[Example 14]
In Example 1, as D, an unstretched polypropylene film (D) having a breaking strength of 47 μm in thickness, 47 MPa, a breaking elongation of 635%, and a Young's modulus of 630 MPa (“Trephan” manufactured by Toray Film Processing Co., Ltd. (registered) Trademark) NO 3301) was used. Otherwise, the A / B / C / D laminate was prepared in the same manner as in Example 1. The characteristics are shown in Table 1.

[Example 15]
In Example 1, an A / B / C laminate and an unstretched polypropylene film (D) (“Pyrene Film-CTP P1128” manufactured by Toyobo Co., Ltd.) are overlapped with C and D, and Mitsui Chemicals uses the dry lamination method. Using “Takelac A-910 (polyol-based main agent)” / “Takenate A-3 (isocyanate-based curing agent)” two-component type (100 parts / 10 parts) adhesive manufactured by Polyurethane Co., Ltd., A / B / C / A D laminate was created. Here, the adhesive application amount was 6 g / m ² as a solid content on the C side, and after aging C / D, an aging treatment was performed at 45 ° C. for 80 hours. Otherwise, the A / B / C / D laminate was prepared in the same manner as in Example 1. The characteristics are shown in Table 1.
[Comparative Example 1]
In Example 1, a stretched nylon film (a biaxially stretched film “Harden film N1100” manufactured by Toyobo Co., Ltd.) was used as the nylon film (B). Others were the same as in Example 1, and an A / B / C / D laminate was prepared. The characteristics are shown in Table 1.

[Comparative Example 2]
In Example 1, a stretched polypropylene film having a thickness of 60 μm (a biaxially stretched polypropylene film “Torphan” (registered trademark) 2500H manufactured by Toray Industries, Inc.) was used as the polypropylene film (D). Others were the same as in Example 1, and an A / B / C / D laminate was prepared. Heat sealing was not possible, a bag could not be created, and a secondary battery container could not be created.
The characteristics are shown in Table 1.

[Comparative Example 3]
In Example 1, the polyester film (A) was not used. A B / C / D laminate was produced in the same manner as in Example 1 except that the A / B laminate was not produced. The characteristics are shown in Table 1.

[Comparative Example 4]
In Example 1, the A / B laminated material and C are overlapped, and A and C are overlapped, and the adhesive, the amount of adhesive applied, and the aging treatment in Example 1 are similarly performed, and the B / A / C laminated material is obtained. Created. Thereafter, a B / A / C / D laminate was produced in the same manner as in Example 1. The characteristics are shown in Table 1.

[Comparative Example 5]
Biaxially stretched polyethylene terephthalate film (A) (“Lumirror” (registered trademark) P60 manufactured by Toray Industries, Inc.) having a thickness of 12 μm, a breaking strength of 240 MPa, and a breaking elongation of 118%, and an aluminum foil (C) having a thickness of 110 μm ("Vespa" 8021, manufactured by Sumi Light Aluminum Foil Co., Ltd.), "Takelac A-910 (polyol-based main agent)" / "Takenate A-3 (isocyanate-based curing agent) manufactured by Mitsui Chemicals Polyurethanes Co., Ltd., by a dry laminating method. "A / C laminates were prepared using a two-component (100 parts by weight / 10 parts by weight) adhesive. Here, the coating amount of the adhesive was 6 g / m ² as a solid content on the A side, and after the A / C bonding, an aging treatment was performed at 45 ° C. for 80 hours.

Non-stretched nylon 6 film (B) having a thickness of 15 μm, a breaking strength of 103 MPa, and a breaking elongation of 398% (“Rayfan” (registered trademark) NO 1401 manufactured by Toray Film Processing Co., Ltd.) and a breaking strength of 40 μm Is an unstretched polypropylene film (D) (Toyobo Co., Ltd. “Pyrene Film-CTP P1128”) having a tensile elongation of 500% and a Young's modulus of 585 MPa by a dry lamination method. A B / D laminate was prepared using a Takelac A-910 (polyol-based main agent) / Takenate A-3 (isocyanate-based curing agent) two-component type (100 parts by weight / 10 parts by weight) adhesive. Here, the adhesive coating amount was 5 g / m ² on the B side as a solid content, and after the B / D bonding, an aging treatment was performed at 40 ° C. for 72 hours.

  A modified polyolefin (manufactured by Mitsui Chemicals, Ltd., functional group graft-modified polypropylene “Admer QE840”) obtained by extruding the A / C laminate and the B / D laminate at a melting temperature of 140 ° C. and a thickness of 10 μm was used as C and B A / C / B / D laminated material was prepared by using it as a sandwich layer. The characteristics are shown in Table 1.

[Comparative Example 6]
In Example 1, an A / B / C / D laminate was prepared in the same manner as in Example 1 except that the thickness was set to 70 μm as C. The characteristics are shown in Table 1.

[Comparative Example 7]
In Example 1, an A / B / C / D laminate was prepared in the same manner as in Example 1 except that the thickness was set to 40 μm as C. The characteristics are shown in Table 1.

[Comparative Example 8]
In Example 1, an A / B / C / D laminate was prepared in the same manner as in Example 1 except that the thickness was set to 20 μm as C. The characteristics are shown in Table 1.

  The laminate material of the present invention has good workability, and the container made from the laminate material of the present invention is excellent in chemical resistance and vibration resistance. Therefore, the laminate material of the present invention is mounted on an electric vehicle, a hybrid vehicle, and an electric motorcycle. It is suitably used as a laminated material for a secondary battery container.

Claims (3)

Polyethylene terephthalate, of poly ethylene naphthalate or polylactic acid film (A), a nylon 6 film (B), aluminum foil (C), polypropylene film (D) is a laminate which are laminated in this order, A are two A laminated material for a secondary battery container, which is an axially stretched film, B and D are unstretched films, and the thickness of C is 80 to 250 μm. The laminated material for a secondary battery container according to claim 1, wherein A has a breaking strength of 150 to 250 MPa and a breaking elongation of 100 to 150%. The secondary battery container formed with the laminated material for secondary battery containers of Claim 1 or 2.