CN1693154A

CN1693154A - Packaging material for battery

Info

Publication number: CN1693154A
Application number: CNA2005100743429A
Authority: CN
Inventors: 山下力也; 望月洋一; 山田一树; 奥下正隆
Original assignee: Dai Nippon Printing Co Ltd
Current assignee: Dai Nippon Printing Co Ltd
Priority date: 2001-06-20
Filing date: 2002-06-17
Publication date: 2005-11-09
Anticipated expiration: 2022-06-17
Also published as: CN1702885A; JP2003007267A; CN100346500C; CN100370638C

Abstract

A battery-use packing material which is a packing material that forms a battery enclosure having a battery body inserted thereinto and the peripheral edge thereof sealed by heat sealing, and that consists of a laminate composed of at least a base material layer, an adhesion layer, a barrier layer, a dry laminate layer, and a sealant layer, characterized in that at least the sealant layer consists of a low-fluidity polypropylene layer not likely to be crushed by heat and pressure by heat sealing and a high-fluidity polypropylene layer likely to be crushed, with the high-fluidity polypropylene layer as the inner-most layer. This battery-use packing material can impart moisture-proofness and content-protecting property.

Description

Battery use packing material

Technical field

The present invention relates to a kind of battery use packing material, be used to have moisture resistance, anti-content rerum natura and the battery of liquid or solid organic bath (high-molecular copolymer electrolyte) is arranged or fuel cell, storage battery, cond etc.

Background technology

Alleged battery refers to contain the object that chemical power is converted to the element of electric energy among the present invention, as lithium ion battery, lithium copolymer battery, fuel cell etc., or contain electrolytic capacitors such as dielectric liquid capacitor such as liquid, solid ceramic, organic matter, solid capacitor, double layer capacitor.

As the purposes of battery, can be used for computer, mobile terminal apparatus (vehicular telephone, PDA etc.), pick up camera, battery-driven car, stored energy storage battery, robot, satellite etc.

Exterior body as above-mentioned battery, can adopt the metallic jar that metal stamping is processed into cylindric or rectangular-shaped containerization, perhaps the laminated body that complex film constituted that is obtained by laminated plastics film, metallic paper etc. be made the container (calling exterior body in the following text) of pouch.

Exterior body as battery has following problem.In the metallic jar, because container outer wall is hard, so the shape of battery itself has just been determined.Thereby hardware aspect will be done the design of matching battery, so adopt the size of the hardware of this battery to be determined by battery, the degree of freedom of shape diminishes.

So, the tendency that adopts above-mentioned bag shape exterior body is arranged.The material-structure of above-mentioned exterior body is from as the necessary rerum natura of battery, processability, economy etc., and the adhesive linkage by substrate layer, barrier layere, sealing layer and bonding above-mentioned each layer constitutes at least, and interlayer is set as required sometimes.

By the laminated body shape pouch or the single face drawing at least of the said structure of battery, the incorporating section that forms battery is to take in battery body, and in bag type or pattern pressing type (lining lid), the necessary part of each periphery seals by heat-sealing makes battery.

As the innermost layer of above-mentioned sealing layer, when requiring between innermost layer heat sealability to be arranged, lead (metal) is also required to have heat sealability.By make above-mentioned innermost layer be have the metal gleyness as acid-modified polyolefin resin, can guarantee adaptation with lead.

A. still, with the words of acid-modified polyolefin resin as the innermost layer lamination of exterior body, compare with general polyolefin resin, owing to reasons such as its poor in processability and cost height, so use the innermost layer of general polyolefin resin as the exterior body sealing layer, the method for employing be make can both heat bonding with innermost layer and lead lead with film between wire portion.

Concrete shown in Fig. 1 G (a), by make lead that sealing layer with respect to metal and exterior body all has a heat sealability with film 6 ' between the sealing layer 14 ' of lead 4 and laminated body 10 ', guarantee leak tightness at wire portion.

As above-mentioned lead film, can adopt by above-mentioned unsaturated carboxylic acid graft polyolefin, metal corsslinking polyethylene, ethene or propylene and acrylic acid or the film that constitutes with the copolymer of methyl acrylic acid.

But, the sealing layer of the laminated body of the exterior body (calling exterior body in the following text) of formation battery, from resistance to effect of heat and leak tightness equal angles employing polypropylene, adopt heating, good, the frangible resin of pressurization seal performance, the i.e. big acrylic resin of fusion index (calling MI in the following text) rank when heat-sealing.Adopt sour modified polypropene film as lead with film.Battery use packing material and lead with such formation seal with film, part in the lead existence, like that, the heat that is used to seal, pressure make the sealing layer 14 ' of above-mentioned exterior body and lead with rete 6 ' equal fusion, also be extruded to outside the zone of pressurization part because of pressurizeing sometimes shown in Fig. 1 G (b).As a result, contact (S) as the aluminium foil of the barrier layere 12 ' of exterior body 10 ' with the lead 4 ' that constitutes by metal sometimes and be short-circuited.

In addition, like that, during the periphery of heat-sealing exterior body, near the sealing layer the inner edge of mouth-sealed portion produces small crack (call root in the following text and split c) sometimes shown in Fig. 1 H (a)～Fig. 1 H (c).If producing this root splits, because battery acid and barrier layere direct contact, the metal of phone body, lead, the insulativity between barrier layere are destroyed, produce difference of potential, at barrier layere sometimes because the corrosion formation through hole, sometimes form and be called as the electrolytical metallic ion reactant of dendrite, shorter battery life thus.

B. in addition, with the words of acid-modified polyolefin resin as the sealing layer or the innermost layer lamination of exterior body, compare with general polyolefin resin, owing to reasons such as its poor in processability and cost height, so use sealing layer or the innermost layer of general polyolefin resin as exterior body, the method for employing be make can both heat bonding with sealing layer or innermost layer and lead lead with film between wire portion.

Concrete shown in Fig. 2 G (a), the lead that all has heat sealability by sealing layer or the innermost layer that makes with respect to lead that is made of metal and exterior body between the hot sealing layer 14 ' of lead 4 and laminated body 10 ', is guaranteed the leak tightness at wire portion with film 6 '.

But sealing layer or innermost layer as the laminated body that constitutes battery exterior body (calling exterior body in the following text), from resistance to effect of heat and leak tightness equal angles employing polypropylene, employing is at heating, good, the frangible resin of pressurization seal performance, the i.e. big acrylic resin of fusion index (calling MI in the following text) rank of heat-sealing.And adopt sour modified polypropene film as the lead film.With the battery use packing material of this spline structure and lead words with the film heat-sealing, part in the lead existence, like that, heat that is used to seal and pressure make the sealing layer 14 ' of above-mentioned exterior body and lead with rete 6 ' equal fusion, also be extruded to outside the zone of pressurization part because of pressurizeing sometimes shown in Fig. 2 G (b).As a result, contact (S) as the aluminium foil of the barrier layere 12 ' of exterior body 10 ' sometimes with the lead 4 ' that constitutes by metal and be short-circuited.

In addition, like that, during the periphery of heat-sealing exterior body, small crack (call root in the following text and split C) takes place near the sealing layer the inner edge of mouth-sealed portion sometimes shown in Fig. 2 H (a)～Fig. 2 H (c).If producing this root splits, because battery acid and barrier layere direct contact, the metal of phone body, lead, the insulativity between barrier layere are destroyed, produce difference of potential, might be at barrier layere because the corrosion formation through hole, sometimes form and be called as the electrolytical metallic ion reactant of dendrite, shorter battery life thus.

C. and, with the words of acid-modified polyolefin resin as the sealing layer lamination of exterior body, compare with general polyolefin resin, owing to reasons such as its poor in processability and cost height, so use the sealing layer of general polyolefin resin as exterior body, the method for employing be make can both heat bonding with sealing layer and lead lead with film between wire portion.

In addition, as battery use packing material, in the above-mentioned structure that constitutes by substrate layer, barrier layere, adhering resin layer, sealing layer,, use the adhering resin layer of sour modified polypropene as the lamination place of barrier layere and sealing layer when making sealing layer when for example the polypropylene/olefin resinoid forms.

But the adhering resin layer that constitutes the laminated body of battery exterior body (calling exterior body in the following text) adopts processability acid modified polyolefin good, that MI is big, the acid modified polyolefin that MI is big be when heat-sealing heating, add and depress frangible resin.Use the words of the battery use packing material heat-sealing that constitutes by this adhering resin layer, part in the lead existence, like that, heat that is used to seal and pressure make adhering resin layer, sealing layer 14 ' and the lead of above-mentioned exterior body with rete 6 ' equal fusion, sometimes also because pressurization is extruded to outside the zone of pressurization part shown in Fig. 3 G (b).As a result, contact (S) as the aluminium foil of the barrier layere 12 ' of exterior body 10 ' with the lead 4 ' that constitutes by metal sometimes and be short-circuited.

In addition, like that, during the periphery of heat-sealing exterior body, small root takes place and splits C near adhering resin layer the inner edge of mouth-sealed portion and sealing layer sometimes shown in Fig. 3 H (a)～Fig. 3 H (c).If this root takes place to be split, because battery acid and barrier layere direct contact, the metal of phone body, lead, the insulativity between barrier layere are destroyed, produce difference of potential, might be at barrier layere because the corrosion formation through hole, sometimes form and be called as the electrolytical metallic ion reactant of dendrite, shorter battery life thus.

What D. be developed in addition also has, and laminated body is taken in the bag type of battery body as pouch or above-mentioned laminated body drawing is formed recess and take in the pattern pressing type of battery body at this recess.Pattern pressing type compares with the bag type, can obtain compact packaging body.No matter being which kind of exterior body, all is indispensable as the battery exterior body as moisture resistance or paracentesis resistance equal strength, the insulativity etc. of battery.

As battery use packing material, at least by laminated body that substrate layer, barrier layere, sealing layer constituted.And the interlayer bind strength of confirming above-mentioned each layer is to the influence as the necessary character of battery exterior body.For example, the bind strength of barrier layere and sealing layer is not enough, will become the reason that moisture immerses from the outside, and electrolyte in the composition of formation battery and above-mentioned reaction of moisture generate hydrofluoric acid and corrode above-mentioned aluminium face, between barrier layere and sealing layer layering take place.When adopting the pattern pressing type exterior body in addition, above-mentioned laminated body drawing is formed recess, when this is shaped, between substrate layer and barrier layere, layering takes place sometimes.

And, when using the high resin of tensile elasticity rate as sealing layer, in embossing was shaped, sealing layer emulsification sometimes produced slight crack on its surface sometimes, shape stability is poor in addition, produces pin hole, shaping fold or crack sometimes.

Also have, as battery use packing material indispensable performance, the leak tightness after the meaningful thing of giving an example is filled, sealed.For example, when the sealing-strength of packing hangs down, be necessary to spend adequate time and on content filling sealing production line, seal, shorten the production efficiency deterioration thereby obviously hinder circulation sometimes.

Brief summary of the invention

A. first kind of form of the present invention

Present inventors learn, in battery packages, can provide following battery use packing material, promptly, in that battery body is inserted with the polypropylene-based resin is in the exterior body of sealing layer and when sealing its periphery and sealing, and heat in the time of can be because of heat-sealing and pressure are short-circuited barrier layere and lead and do not worry producing the good stable sealable battery use packing material of insulativity that root splits at sealing layer.

Therefore, invention based on first kind of form of the present invention, be a kind of battery use packing material, it is characterized in that: the battery use packing material that insert battery body, forms leak free battery exterior body by the heat-sealing circumference is at least by the laminated body that substrate layer, adhesive linkage, barrier layere, dried laminate layers, sealing layer constituted, and sealing layer is by at the heat of heat-sealing with add to depress and be difficult for broken lazy flow polypropylene layer and breakable high-flowability polypropylene layer constitutes and innermost layer is the high-flowability polypropylene layer at least.

B. second kind of form of the present invention

Present inventors learn, in battery packages, can provide following battery use packing material, promptly, battery body being inserted into the polypropylene-based resin is in the exterior body of sealing layer and when sealing its periphery and sealing, and barrier layere that can make exterior body because of heat and the pressure in heat-sealing and lead are not short-circuited and do not worry producing at sealing layer that root splits, the good stable sealable battery use packing material of insulativity.

Therefore, invention based on second kind of form of the present invention is a kind of battery use packing material, it is characterized in that: the battery use packing material that insert battery body, forms leak free battery exterior body by the heat-sealing circumference is the laminated body that is made of substrate layer, adhesive linkage, barrier layere, adhering resin layer, sealing layer at least, and sealing layer is by at the heat of heat-sealing with add to depress and be difficult for broken lazy flow polypropylene layer and breakable high-flowability polypropylene layer constitutes and innermost layer is the high-flowability polypropylene layer at least.

C. the third form of the present invention

Present inventors learn, in battery packages, can provide following battery use packing material, promptly, be inserted into battery body in the exterior body and sealing its periphery and when sealing, barrier layere that can make exterior body because of the heat and the pressure of heat-sealing and lead are not short-circuited and do not worry producing the good stable sealable battery use packing material of insulativity that root splits at sealing layer.

Therefore, invention based on the third form of the present invention is a kind of battery use packing material, it is characterized in that: the battery use packing material that insert battery body, forms leak free battery exterior body by the heat-sealing circumference is the laminated body that is made of substrate layer, adhesive linkage, aluminium, chemical conversion processing layer, adhering resin layer, polyacrylic resin sealing layer at least, and the adhering resin layer is formed by the resin of fusion index in 5～20g/10 divides scope.

D. the 4th kind of form of the present invention

Present inventors learn, a kind of manufacture method of battery use packing material can be provided, and this material is as the material that is used for battery packages, and when battery body protection rerum natura was good, the productivity in embossing forming process and content filling sealing process etc. might as well.

Therefore, invention based on the 4th kind of form of the present invention is a kind of battery use packing material, it is characterized in that: the battery use packing material that insert battery body, forms leak free battery exterior body by the heat-sealing circumference is at least by substrate layer, adhesive linkage 1, barrier layere, adhesive linkage 2, laminated body that sealing layer constituted, and sealing layer is formed by the resin bed lamination of the wire low density polyethylene (LDPE) that contains class of metallocenes more than one deck at least.

Description of drawings

Figure 1A is a battery use packing material instruction diagram of the present invention, Figure 1A (a) is that expression is the battery use packing material, lead of the laminar texture cutaway view with the mutual alignment relation of film, lead, Figure 1A (b) is explanation at lead, lead wire portion, before the heat-sealing with the join cutaway view of state of film and exterior body, and Figure 1A (c) is the schematic sectional view of the wire portion after sealing.Figure 1A (d), Figure 1A (e) and Figure 1A (f) are the respective description figure when adopting by battery use packing material that other hermetically-sealed constructions constituted.

Figure 1B is the cutaway view of layer structure example that forms the laminated body of battery exterior body.

Fig. 1 C is the perspective illustration of battery bag type exterior body.

Fig. 1 D is the perspective illustration of battery pattern pressing type exterior body.

Fig. 1 E is the shaping instruction diagram of pattern pressing type, and Fig. 1 E (a) is a block diagram, and Fig. 1 E (b) is the exterior body body that embossing is shaped, and Fig. 1 E (c) is the cutaway view at X2-X2 place, and Fig. 1 E (d) is the enlarged drawing at Y1 place.

Fig. 1 F is the installation method instruction diagram of battery use packing material and the lead lead when bonding with film.

Barrier layere and the lead cutaway view of state that is short-circuited when Fig. 1 G is to use existing battery use packing material and lead with film.

Fig. 1 H is the scheme drawing that root that heat-sealing is produced when using the periphery of existing battery use packing material exterior body splits, and Fig. 1 H (a) is the block diagram of battery, and Fig. 1 H (b) is the cutaway view at X-X place, and Fig. 1 H (c) is the enlarged drawing at Y2 place.

Fig. 2 A is a battery use packing material instruction diagram of the present invention, Fig. 2 A (a) is that expression is the battery use packing material, lead of the laminar texture cutaway view with the mutual alignment relation of film, lead, Fig. 2 A (b) is explanation at lead, lead wire portion, before the heat-sealing with the join cutaway view of state of film and exterior body, and Fig. 2 A (c) is the schematic sectional view of the wire portion after sealing.Fig. 2 A (d), Fig. 2 A (e) and Fig. 2 A (f) are the respective description figure when adopting by battery use packing material that other hermetically-sealed constructions constituted.

Fig. 2 B is the cutaway view of layer structure example that forms the laminated body of battery exterior body.

Fig. 2 C is the perspective illustration of the bag type exterior body of battery.

Fig. 2 D is the perspective illustration of the pattern pressing type exterior body of battery.

Fig. 2 E is the shaping instruction diagram of pattern pressing type, and Fig. 2 E (a) is a block diagram, and Fig. 2 E (b) is the exterior body body that embossing is shaped, and Fig. 2 E (c) is the cutaway view at X2～X2 place, and Fig. 2 E (d) is the enlarged drawing of Y1 portion.

Fig. 2 F is the installation method instruction diagram of battery use packing material and the lead lead when bonding with film.

Barrier layere and the lead cutaway view of state that is short-circuited when Fig. 2 G is to use existing battery use packing material and lead with film.

The scheme drawing that the root that Fig. 2 H is produced when being the periphery of the heat-sealing exterior body that uses existing battery use packing material splits, Fig. 2 H (a) is the block diagram of battery, and Fig. 2 H (b) is the cutaway view at X3-X3 place, and Fig. 2 H (c) is the enlarged drawing at Y2 place.

Fig. 3 A is the instruction diagram of battery use packing material of the present invention, and Fig. 3 A (a) is the cutaway view of the layer structure example of battery use packing material, and Fig. 3 A (b) is the cutaway view of other layers structure example of battery use packing material.

Fig. 3 B is a battery use packing material instruction diagram of the present invention, Fig. 3 B (a) is the cutaway view of the position relation of the expression battery use packing material, the lead that are laminar texture, Fig. 3 B (b) is explanation at the join cutaway view of state of lead wire portion, before the heat-sealing and exterior body, and Fig. 3 B (c) is the schematic sectional view of the wire portion after sealing.Fig. 3 B (d) is that expression is the battery use packing material, lead of the laminar texture cutaway view with the mutual alignment relation of film, lead, Fig. 3 B (e) is lead before the heat-sealing and lead with the join cutaway view of state of film and exterior body, and Fig. 3 B (f) is the schematic sectional view of the wire portion after sealing.

Fig. 3 C is the perspective illustration of the bag type exterior body of battery.

Fig. 3 D is the perspective illustration of the pattern pressing type exterior body of battery.

Fig. 3 E is the shaping instruction diagram of pattern pressing type, and Fig. 3 E (a) is a block diagram, and Fig. 3 E (b) is the exterior body body that embossing is shaped, and Fig. 3 E (c) is the cutaway view at X2-X2 place, and Fig. 3 E (d) is the enlarged drawing at Y1 place.

Fig. 3 F is the installation method instruction diagram of battery use packing material and the lead lead when bonding with film.

Fig. 3 G produces the instruction diagram that root splits at the existing adhering resin layer of forming, and Fig. 3 G (a) is the cutaway view of battery use packing material, and Fig. 3 G (b) is the enlarged drawing at Y2 place.

The scheme drawing that root splits takes place when being the periphery of the heat-sealing exterior body that uses existing battery use packing material in Fig. 3 H, and Fig. 3 H (a) is the block diagram of battery, and Fig. 3 H (b) is the cutaway view at X3-X3 place, and Fig. 3 H (c) is the enlarged drawing at Y2 place.

Fig. 4 A is a battery use packing material instruction diagram of the present invention, and Fig. 4 A (a) is the cutaway view of laminated body embodiment D, and Fig. 4 A (b) is the cutaway view of the embodiment D of other laminated body.

Fig. 4 B is the formation instruction diagram of sealing layer, and Fig. 4 B (a) is the cutaway view of individual layer sealing layer, and Fig. 4 B (b) is the cutaway view of 2 layers of sealing layer, the cutaway view when Fig. 4 B (c) is 3 layers of sealing layer.

Fig. 4 C is the cutaway view of the different laminating methods of battery use packing material of the present invention, and Fig. 4 C (a) does laminating, and Fig. 4 C (b) is a lamination methods, and Fig. 4 C (c) is the interlayer laminating, and Fig. 4 C (d) is the co-extrusion pressure laminating.

Fig. 4 D is the perspective illustration of the bag type exterior body of battery.

Fig. 4 E is the perspective illustration of the pattern pressing type exterior body of battery.

Fig. 4 F is the shaping instruction diagram of pattern pressing type, and Fig. 4 F (a) is a block diagram, and Fig. 4 F (b) is the exterior body body that embossing is shaped, and Fig. 4 F (c) is an X2-X2 place cutaway view, and Fig. 4 F (d) is a Y1 place enlarged drawing.

The reference numeral explanation

A. Figure 1A～H

S is the short circuit portion of lead and barrier layere

H is the heat-sealing hot plate

C is that root splits portion

T is for being detained resin portion

1 is battery

2 is battery body

3 is galvanic battery (Reserve Power Division)

4 is lead (electrode)

5 is exterior body

6 are the lead film

7 is recess

8 is side wall portion

9 is mouth-sealed portion

10 is laminated body (battery use packing material)

11 is substrate layer

12 is aluminium (barrier layere)

13 is dried laminate layers

14 is sealing layer

14f is the High Flowability PP layer

14r is a lazy flow PP layer

15 is protective cover

16 is the dried laminate layers of base material side

20 are drawing portion

21 is punch

22 is die

23 is die cavity

B. Fig. 2 A～H

S is the short circuit portion of lead and barrier layere

H is the heat-sealing hot plate

C is that root splits portion

T is for being detained resin portion

1 is battery

2 is battery body

3 is galvanic battery (Reserve Power Division)

4 is lead (electrode)

5 is exterior body

6 are the lead film

7 is recess

8 is side wall portion

9 is mouth-sealed portion

10 is laminated body (battery use packing material)

11 is substrate layer

12 is aluminium (barrier layere)

13 is the adhering resin layer

13h is the acid modified polyolefin sinter layer

13e is the extruded layer of acid modified polyolefin

14 is sealing layer

14f is the High Flowability PP layer

14r is a lazy flow PP layer

15 is protective cover

16 is the dried laminate layers of base material side

20 are drawing portion

21 is punch

22 is die

23 is die cavity

C. Fig. 3 A～H

H is the heat-sealing bar

C is that root splits

1 is battery

2 is battery body

3 is galvanic battery (Reserve Power Division)

4 is lead (electrode)

5 is exterior body

6 are the lead film

7 is recess

8 is side wall portion

9 is mouth-sealed portion

10 is laminated body (battery use packing material)

11 is substrate layer

12 is aluminium (barrier layere)

13 is the adhering resin layer

14 is sealing layer

Mx is the hot melt coating

15 is the chemical conversion processing layer

16 is the dried laminate layers of base material side

20 are drawing portion

21 is punch

22 is die

23 is die cavity

D. Fig. 4 A～F

H is the heat-sealing hot plate

1 is battery

2 is battery body

3 is galvanic battery (Reserve Power Division)

4 is lead (electrode)

5 is exterior body

7 is recess

8 is side wall portion

9 is mouth-sealed portion

10 is laminated body (battery use packing material)

11 is substrate layer

12 is aluminium (barrier layere)

13 is adhesive linkage

13d is dried laminate layers

13h is the sinter layer of acid modified polyolefin

The extruded layer of the acid modified polyolefin when 13es is the interlayer laminating

The extruded layer of the acid modified polyolefin when 13ec is the co-extrusion pressure laminating

14 is sealing layer

S1 is the skin of sealing layer

S2 is the interlayer of sealing layer

S3 is the internal layer of sealing layer

15 is the chemical conversion processing layer

16 is the dried laminate layers of base material side

20 drawing portions

21 punch

22 dies

23 die cavities

Specifying of invention

A. first kind of form of the present invention

1. concrete form

Concrete example based on the invention of first kind of form of the present invention can followingly illustrate.Promptly, the inventive features of being put down in writing in the claim 1 is, the packing that insert battery body, form leak free battery exterior body by the heat-sealing circumference are at least by laminated body that substrate layer, adhesive linkage, barrier layere, dried laminate layers, sealing layer constituted, at least sealing layer is made of not breakable lazy flow polypropylene layer and breakable high-flowability polypropylene layer under the heat that seals, pressure, and innermost layer is the high-flowability polypropylene layer.The inventive features of record is that the barrier layere of being put down in writing in the claim 1 is provided with the chemical conversion processing layer at least on its dried laminate layers side in the claim 2.The inventive features of record is in the claim 3, and the sealing layer of being put down in writing in the claim 1 or 2 is made of 2 layers on lazy flow polypropylene layer and high-flowability polypropylene layer and is innermost layer with the high-flowability polypropylene layer.The inventive features of record is that the sealing layer of being put down in writing in the claim 1 or 2 is made of for 3 layers high-flowability polypropylene layer, lazy flow polypropylene layer, high-flowability polypropylene layer in the claim 4.The inventive features of record is in the claim 5, makes between the wire portion of battery use packing material that lead put down in writing in any one of claim 1～4 with film and battery body.

2. working of an invention form

Further describe the present invention with following accompanying drawing etc.

Figure 1A is a battery use packing material instruction diagram of the present invention, Figure 1A (a) is the cutaway view of the mutual alignment relation of the expression battery use packing material, the lead that are laminar texture, Figure 1A (b) is explanation at the join cutaway view of state of lead wire portion, before the heat-sealing and exterior body, and Figure 1A (c) is the schematic sectional view of the wire portion after sealing.Figure 1A (d), Figure 1A (e) and Figure 1A (f) are the respective description figure when adopting by battery use packing material that other hermetically-sealed constructions constituted.Figure 1B is the cutaway view of layer structure example that forms the laminated body of battery exterior body.Fig. 1 C is the perspective illustration of the bag type exterior body of battery.Fig. 1 D is the perspective illustration of the pattern pressing type exterior body of battery.Fig. 1 E is the shaping instruction diagram of pattern pressing type, and wherein Fig. 1 E (a) is a block diagram, and Fig. 1 E (b) is the exterior body body that embossing is shaped, and Fig. 1 E (c) is the cutaway view at X2-X2 place, and Fig. 1 E (d) is the enlarged drawing at Y1 place.Fig. 1 F is the installation method instruction diagram of battery use packing material and the lead lead when bonding with film.

As the lead of battery, be to constitute by elongated tabular or bar-shaped metal, as tabular lead, thickness is that 50～2000 μ m, width are about 2.5～20mm, its material is AL, Cu (containing plating Ni), Ni etc.

Require the exterior body of battery have can long term maintenance battery body performance performance, with substrate layer, barrier layere, hot sealing layer etc. by various laminating laminations.Particularly, when the hot sealing layer that constitutes the laminated body of battery exterior body (to call exterior body in the following text) is made of polyolefin resin etc., battery body is received in the exterior body, seal its periphery and when sealing, the part that exists at lead, when for example using film with acid modified polyolefin as lead, heat that is used to seal and pressure make the sealing layer of above-mentioned exterior body and lead with the equal fusion of rete, in addition because pressurization, the barrier layere of exterior body and the lead that constitutes by the metal S that contacts sometimes and be short-circuited.

Shown in Fig. 1 H (a)～Fig. 1 H (c), when the periphery of exterior body was sealed, near the sealing layer the inner edge of mouth-sealed portion produced small crack (splitting C to call root in the following text) sometimes.If producing this root splits, because battery acid and barrier layere direct contact, the metal of phone body, lead, the insulativity between barrier layere are destroyed, produce difference of potential, sometimes on barrier layere, form because the through hole that corrosion is caused, sometimes form the reactant that is called as the electrolytical metallic ion of dendrite, therefore, shorter battery life.

Present inventors concentrate on studies to the generation that prevents short circuit S, found that by following measure and can solve this problem and finish the present invention: insert battery body, the packing that form leak free battery exterior body by the heat-sealing circumference are at least by substrate layer, adhesive linkage, barrier layere, dried laminate layers, the laminated body that sealing layer constituted, at least sealing layer is a multilayer, be difficult for broken lazy flow polypropylene layer (to call lazy flow PP layer or lazy flow PP in the following text) by heat with adding to depress in heat-sealing, breakable high-flowability polypropylene layer (to call High Flowability PP layer or High Flowability PP in the following text) constitutes, and is innermost layer with the High Flowability PP layer.

The multi-layer sealed layer of battery use packing material among the present invention, during by heat-sealing sealing exterior body, above-mentioned lazy flow PP layer, under the heat and pressure effect of the heat-sealing that accommodates battery use packing material leak free heat seal condition, even become the molten resin attitude, also be lazy flow, and dielectric film is present between barrier layere and the lead, and the effect that prevents that near the root of mouth-sealed portion from splitting is arranged.On the other hand, the High Flowability PP layer is low viscosity when fusion, has shown the sealing effectiveness of stage portion, also has, and its effect is, seals and is given as security broken thickness attenuation, thereby reduce the mouth-sealed portion sectional area moisture permeability that comes from the cross section is reduced.

The flowing power of above-mentioned lazy flow PP, High Flowability PP can be according to distinguishing based on fusion index that JISK7210 measured (below be designated as MI) value.More satisfactory MI as the lazy flow PP among the present invention is 0.5～3.0g/10min, and the more satisfactory MI of High Flowability PP is 5.0～30g/10min.

Battery use packing material of the present invention is shown in Figure 1B (a); be at least by substrate layer 11, adhesive linkage 16, aluminium 12, protective cover 15, dried lamination adhesive linkage 13d, multi-layer sealed layer 14 laminated body that is constituted, multi-layer sealed layer is that lazy flow PP layer 14r and High Flowability PP layer 14f are two-layer.

Again; shown in Figure 1B (a); be at least by substrate layer 11, adhesive linkage 16, aluminium 12, protective cover 15, dried lamination adhesive linkage 13d, multi-layer sealed layer 14 laminated body that is constituted, multi-layer sealed layer also can be High Flowability PP layer 14f (1), lazy flow PP layer 14r, High Flowability PP layer 14f (2) 3 layers.

The high-flowability polypropylene layer of the sealing layer in the battery use packing material of the present invention with the more satisfactory bed thickness ratio of lazy flow polypropylene layer is: lazy flow PP is more than 1.5 times of High Flowability PP, and proper range is lazy flow PP: High Flowability PP=95: 5～60: 40.

In addition, when sealing layer was three layers, in High Flowability PP (1)/lazy flow PP/ High Flowability PP (2), the more satisfactory thickness of lazy flow PP was more than 1.5 times of aggregate thickness of High Flowability PP (1) and High Flowability PP (2).

Promptly, when the thickness of lazy flow PP is lower than 1.5 times of the High Flowability PP thickness total bed thickness of outer and internal layer (in three layers of formation for), be difficult for manifesting the not breakable effect of lazy flow PP during heat-sealing, barrier layere and lead become easy short circuit and can not prevent that root from splitting.The suitable total thickness of sealing layer is 20 μ m～200 μ m.

As the polypropylene that is used for sealing layer of the present invention, can adopt equal chain polypropylene, random polypropylene, block type polypropylene.

Therefore the polypropylene sealing layer of battery use packing material of the present invention when pressurizing window, is necessary to make with respect to sealing layer and lead both sides all to have the lead usefulness film of heat sealability between battery lead portion and exterior body because metal is not had gleyness.For example, shown in Fig. 1 F (a) and Fig. 1 F (b), like that, lead is placed about the pressurizing window portion of lead 4 of battery body 2 (in fact by connect temporarily seal fixing) with film 6, in the insertion exterior body 5, seal by heat-sealing seizing on both sides by the arms under the state of wire portion.Can shown in Fig. 1 F (d) or Fig. 1 F (e) like that the film of lead with film 6 be wound on the assigned position of lead 4 with the method for film 6 as lead between lead 4 places.

Specifically, above-mentioned lead with film can adopt sour modified polypropene (unsaturated carboxylic acid graft atactic propene), metal corsslinking polyethylene, ethene and acrylic acid or with the monomer of the copolymer of copolymer, ethene and the vinyl acetate of methacrylic acid derivative or compound etc.

This lead is the getting final product more than 1/3 of thickness of employed lead 4 with the bed thickness of film 6.For example, if the lead 4 of 100 μ m thickness, lead gets final product with the about 30 μ m of total thickness of film 6 are above.

Adopt battery use packing material of the present invention to form exterior body, battery body inserted in this exterior body the heat-sealing periphery and when sealing, the state that seals of wire portion is such shown in Figure 1A (c) or Figure 1A (f), each lazy flow PP layer 14r becomes membranaceous, can avoid taking place to split as the barrier layere 12 of problem of the present invention and the short circuit and the root of lead 4.

Battery use packing material is the material that forms the exterior body of battery pack body, according to the form of exterior body the pattern pressing type shown in the bag type shown in Fig. 1 C, Fig. 1 D (a), Fig. 1 D (b), Fig. 1 D (c) is arranged.Have three side sealing mouth, four sides to seal and pillow type etc. in the above-mentioned bag type, Fig. 1 C is the example of pillow type.

Pattern pressing type both can be shown in Fig. 1 D (a) like that, form recess in one side, also can be shown in Fig. 1 D (b) like that, form recess on the two sides and take in the four sides of battery body heat-sealing periphery and seal.In addition, also, take in the form that battery seals three limits just like forming recess across bending part in both sides shown in Fig. 1 D (c).When battery use packing material was pattern pressing type, like that, the drawing packing 10 of lamination formed recess 7 shown in Fig. 1 E (a)～Fig. 1 E (d).

Then each layer that constitutes battery use packing material of the present invention described.Above-mentioned substrate layer 11 in the exterior body is made of the polyester or the nylon membrane that stretch, at this moment, as alkide resin polyethylene terephthalate, polybutylene terephthalate, polyphenyl dioctyl phthalate second diester, polyphenyl dioctyl phthalate fourth diester, polyester copolymer, polycarbonate etc. can be arranged.In addition, amilan can be arranged as nylon, promptly the copolymer of nylon 6,

nylon

6,6, nylon 6 and

nylon

6,6,

nylon

6,10, poly---Xlylene adipoyl diamines (MXD6) etc.

When above-mentioned substrate layer 11 is used as battery, owing to be and hardware direct contact position that the resin bed that has insulativity basically is better.Consider the pin hole that exists on the film monomer, the generation that reaches pin hole when processing etc., the thickness of substrate layer will be more than 6 μ m, and preferred thickness is 12～30 μ m.

For improving anti-pin hole and insulativity during as the battery exterior body, substrate layer 11 can also laminationizations.During the lamination substrate layer, substrate layer contains a resin bed more than 2 layers at least, and the bed thickness of each layer is above, 12～30 μ m preferably of 6 μ m.As the example of lamination substrate layer, have following 1)～8).

1) nylon of drawn polyethylene terephthalate/stretching.

2) nylon/drawn polyethylene terephthalate of La Shening; in addition; consider the mechanical comformability (package packing machine of packing; transmission stability in the processing equipment); surface protection (resistance to effect of heat; electrolyte-resistant); secondary processing; when the battery exterior body is pattern pressing type; the mould when reducing embossing and the friction drag of substrate layer or protection substrate layer when adhering to battery acid can be with the substrate layer multiple stratifications; comparatively ideal is on the substrate layer surface fluorine-type resin layer to be set; the acrylic resin layer; the silicone resin bed; the polyester resin layer; oleamide; erucyl amide; slip agents such as two oleamides or the resin bed that constitutes by these compounds.For example:

3) fluorine-type resin/drawn polyethylene terephthalate (fluorine-type resin, dry formation after membranoid substance or the aqueous coating).

4) silicone resin/drawn polyethylene terephthalate (silicone resin, dry formation after membranoid substance or the aqueous coating).

5) nylon of fluorine-type resin/drawn polyethylene terephthalate/stretching.

6) nylon of silicone resin/drawn polyethylene terephthalate/stretching.

7) nylon of acrylic resin/stretching (acrylic resin, dry sclerosis after membranoid substance or the aqueous coating).

8) nylon of acrylic resin+polysiloxane-grafted class acrylic resin/stretching (acrylic resin, dry sclerosis after membranoid substance or the aqueous coating).

Above-mentioned barrier layere 12 is for preventing that particularly water vapour is from the layer of outside immersion inside battery; be the pin hole of stabilization barrier monomer, and flexibility (adaptability) of operation (bag shapeization, embossing formability); and make it have anti-pin hole; can steam the film of metal such as the above aluminium of attached thick 15 μ m, nickel or mineral compound, for example; monox, aluminium oxide etc., comparatively ideal as barrier layere is to be that the aluminium of 20～80 μ m is that base forms protective cover described later with preferred thickness.

For the generation that further improves pin hole, and when the battery exterior body made pattern pressing type embossing do not produce crack etc. in being shaped, present inventors by the iron level in the material that makes the aluminium that uses as barrier layere be 0.3～9.0 weight %, comparatively ideal be 0.7～2.0 weight %, compare with nonferrous aluminium, the ductility of finding aluminium is good, as laminated body, the pin hole that bending causes reduces, and sidewall can form easily when being shaped above-mentioned pattern pressing type exterior body.Above-mentioned iron level be can't see and prevented that pin hole from effects such as embossing formability taking place, improving during less than 0.3 weight %, when the iron level of above-mentioned aluminium surpasses 9.0 weight %, is hindered as the flexibility of aluminium, as the deterioration of laminated body bag.

In addition, the aluminium of cold rolling manufacturing is under annealing (so-called annealing in process) condition, though its flexibility intensity hardness can change, aluminium used among the present invention is compared with the hard item for disposal that does not have annealed processing, and the aluminium of soft tendency should what or complete annealed processing be arranged.The degree of the flexibility intensity hardness of above-mentioned aluminium, promptly Tui Huo condition cooperates flexibility (adaptability) of operation (bag typeization, embossing are shaped) suitably to select to get final product.For example, fold or pin hole when preventing that embossing is shaped, comparatively ideal is to select the soft aluminium of annealing corresponding to the shaping degree for use.

Present inventors find to form protective cover by the surface that makes barrier layere 12 aluminium, the back side, handle as implementing chemical conversion, can realize satisfying the laminated body as above-mentioned packing.Above-mentioned chemical conversion is handled and specifically is meant the resistance to acids overlay film that forms phosphate, chromate, fluoride, cyanuric acid cmpd etc., form in the material at above-mentioned resistance to acids overlay film, adopt the chromium phosphate hydrochlorate gloss finish that constitutes by phenolic resin, charomic fluoride (3) cmpd, tricresyl phosphate kind composition better.In addition, in containing the resinous principle of phenolic resin, there is the chemical conversion inorganic agent of metals such as containing molybdenum, titanium, zircon or slaine better at least.Can obtain following effect by forming above-mentioned resistance to acids overlay film: aluminium when preventing the embossing shaping and the layering between the substrate layer, can also prevent the dissolving of the electrolyte of battery and hydrogen fluoride that reaction of moisture generates, corrosion aluminium surface, prevent that particularly dissolving, corrosion are present in the lip-deep aluminium oxide of aluminium, and can also improve the gleyness (wetting state) on aluminium surface, the layering that prevents substrate layer 11 when embossing is shaped heat-sealing and aluminium 12, the hydrogen fluoride that prevents to be generated in aluminium inner face side generation layering because of electrolyte and reaction of moisture.

Adopt various materials, implement chemical conversion at the aluminium face and handle, its effect is discovered, form at above-mentioned resistance to acids overlay film and adopt the chromium phosphate hydrochlorate gloss finish that constitutes by phenolic resin, charomic fluoride (3) cmpd, tricresyl phosphate kind composition better in the material.

In addition, in containing the resinous principle of phenolic resin, there is the chemical conversion inorganic agent of metals such as containing molybdenum, titanium, zircon or slaine better at least.

When exterior body is bag during type, arbitrary of only handling on the two sides of a side of hot sealing layer side or substrate layer side and hot sealing layer side of the chemical conversion of aluminium all can.When the exterior body of battery is pattern pressing type, handle layering between aluminium and substrate layer in the time of to prevent the embossing shaping by implementing chemical conversion on the two sides of aluminium.

Sealing layer in the battery use packing material of the present invention is combined into multilayer by lazy flow PP and High Flowability PP, and is High Flowability PP with the innermost layer as previously mentioned.Comparatively ideal as the gross thickness of sealing layer is to 200 μ m from 20 μ m.

During lamination battery use packing material of the present invention, be located at the bonding of protective cover on the barrier layere and sealing layer, for example in lithium ion battery etc.,, wish to use and do laminating for the layering that prevents that hydrofluoric acid that battery acid and reaction of moisture produce etc. from causing.

In the battery use packing material of the present invention, in order to improve the comformability and the stabilization of system film, lamination processing, end article secondary processing (bag typeization, embossing are shaped), also can handle at the suitable surface activations such as corona treatment, sand-blast finish, oxidation treatment, ozone treatment that carry out of above-mentioned each layer in the laminated body that forms exterior body.

B. Fa Ming second kind of form

1. concrete form

Object lesson based on second kind of form of the present invention can followingly illustrate.The inventive features that is in the claim 6 to be put down in writing is, the packing that insert battery body, form leak free battery exterior body by the heat-sealing circumference are the laminated body that are made of substrate layer, adhesive linkage, barrier layere, adhering resin layer, sealing layer at least, at least sealing layer is made of not breakable lazy flow polypropylene layer and breakable high-flowability polypropylene layer under the heat that seals, pressure, and innermost layer is the high-flowability polypropylene layer.

The inventive features of record is in the claim 7, and the barrier layere of record is provided with the chemical conversion processing layer in its adhering resin layer one side at least in the claim 6.

The inventive features of record is in the claim 8, and the sealing layer of being put down in writing in claim 6 or the claim 7 is made of for 2 layers lazy flow polypropylene layer and high-flowability polypropylene layer, and is innermost layer with the high-flowability polypropylene layer.The inventive features of record is that the sealing layer of being put down in writing in claim 6 or the claim 7 is made of for 3 layers high-flowability polypropylene layer, lazy flow polypropylene layer, high-flowability polypropylene layer in the claim 9.In the claim 10 record inventive features be, any emulsion sinter layer that the adhering resin layer of being put down in writing is an acid modified polyolefin of claim 6～claim 9, at this sinter layer back seal layer by lamination methods by bonding.The inventive features of claim 11 record is that any adhering resin layer of being put down in writing of claim 6～claim 9 is sour modified polypropenes, and the sealing layer of making film is in advance carried out lamination with the interlayer laminating.The inventive features of record is in the claim 12, and any adhering resin layer of being put down in writing of claim 6～claim 9 is sour modified polypropenes, with co-extrusion pressure laminating lamination sealing layer and adhering resin layer.The inventive features of record is in the claim 13, makes between the wire portion of battery use packing material that adhesion film put down in writing in any of claim 6～claim 12 and battery body.

2. working of an invention form

Battery use packing material of the present invention is the battery use packing material that is made of substrate layer, adhesive linkage, barrier layere, adhering resin layer, sealing layer at least, heat by being combined in when heat-sealing and the easy crushable layer pressure under be difficult for crushable layer and constitute sealing layer, the generation that the sealing layer root splits can be prevented, barrier layere can also be realized not taking place and lead is short circuited seals.With more detailed description the present invention such as following accompanying drawings.

Fig. 2 A is the instruction diagram of battery use packing material of the present invention, Fig. 2 A (a) is the cutaway view of the mutual alignment relation of the expression battery use packing material, the lead that are laminar texture, Fig. 2 A (b) is explanation at the join cutaway view of state of lead wire portion, before the heat-sealing and exterior body, and Fig. 2 A (c) is the schematic sectional view of the wire portion after sealing.Fig. 2 A (d), Fig. 2 A (e) and Fig. 2 A (f) are the respective description figure when adopting by battery use packing material that other hermetically-sealed constructions constituted.Fig. 2 B is the cutaway view of layer structure example that forms the laminated body of battery exterior body.Fig. 2 C is the perspective illustration of battery bag type exterior body.Fig. 2 D is the perspective illustration of battery pattern pressing type exterior body.Fig. 2 E is the shaping instruction diagram of pattern pressing type, and Fig. 2 E (a) is a block diagram, and Fig. 2 E (b) is the exterior body body that embossing is shaped, and Fig. 2 E (c) is the cutaway view at X2-X2 place, and Fig. 2 E (d) is the enlarged drawing at Y1 place.Fig. 2 F is the installation method instruction diagram of battery use packing material and the lead lead when bonding with film.

Require the exterior body of battery have can long term maintenance battery body performance performance, with substrate layer, barrier layere, hot sealing layer etc. by various laminating laminations.Particularly, when the hot sealing layer that constitutes the laminated body of battery exterior body (to call exterior body in the following text) is made of polyolefin resin etc., battery body is received in the exterior body, its periphery sealed and when sealing, part in the lead existence, for example with acid modified polyolefin when use film as lead, heat that is used to seal and pressure make the sealing layer of above-mentioned exterior body and lead with the equal fusion of rete, and because the barrier layere of the exterior body that pressurizes and the lead that is made of metal contact sometimes and are short-circuited S.

Shown in Fig. 2 H (a)～Fig. 2 H (c), when the periphery of exterior body was sealed, near the sealing layer the inner edge of mouth-sealed portion produced small crack (splitting C to call root in the following text) sometimes.If producing this root splits, because battery acid and barrier layere direct contact, insulativity between phone body, lead metal, barrier layere is destroyed, produce difference of potential, sometimes on barrier layere, form because the through hole that corrosion is caused, sometimes form the reactant that is called as the electrolytical metallic ion of dendrite, therefore, shorter battery life.

Present inventors concentrate on studies to the generation that prevents short circuit S, found that by following measure and can solve this problem and finish the present invention: insert battery body, sealing the packing that form the battery exterior body by the heat-sealing circumference is at least by substrate layer, adhesive linkage, barrier layere, the adhering resin layer, the laminated body that sealing layer constituted, at least sealing layer is a multilayer, be difficult for broken lazy flow polypropylene layer (to call lazy flow PP layer or lazy flow PP in the following text) and breakable high-flowability polypropylene layer (to call High Flowability PP layer or High Flowability PP in the following text) formation by depressing, and be innermost layer with the High Flowability PP layer at the heat and adding of heat-sealing.

The multi-layer sealed layer of battery use packing material among the present invention, during by heat-sealing sealing exterior body, above-mentioned lazy flow PP layer, under the heat and pressure effect of the heat-sealing that is fit to battery use packing material leak free heat seal condition, even become the molten resin attitude, also be lazy flow, and dielectric film is present between barrier layere and the lead, and the effect that prevents that near the root of mouth-sealed portion from splitting is arranged.On the other hand, the High Flowability PP layer is low viscosity when fusion, has shown the sealing effectiveness of stage portion, also has, and its effect is, seals and is given as security broken thickness attenuation, thereby reduce the mouth-sealed portion sectional area moisture permeability that comes from the cross section is reduced.

The flowing power of above-mentioned lazy flow PP, High Flowability PP can be according to distinguishing based on fusion index that JISK7210 measured (below be designated as MI) value.

More satisfactory MI as the lazy flow PP among the present invention is 0.5～3.0g/10min, and the more satisfactory MI of High Flowability PP is 5.0～30g/10min.

Battery use packing material of the present invention is shown in Fig. 2 B (a) or Fig. 2 B (b); be at least by substrate layer 11, adhesive linkage 16, aluminium 12, protective cover 15, adhering resin layer 13d, multi-layer sealed layer 14 laminated body that is constituted, multi-layer sealed layer is that lazy flow PP layer 14r and High Flowability PP layer 14f are two-layer.In addition; for example; such shown in Fig. 2 B (c) or 2B (d); be at least by substrate layer 11, adhesive linkage 16, aluminium 12, protective cover 15, adhering resin layer 13d, multi-layer sealed layer 14 laminated body that is constituted, multi-layer sealed layer also can be (2) 3 layers of High Flowability PP layer 14f (1), lazy flow PP layer 14r, High Flowability PP layer 14f.

In addition, when sealing layer was 3 layers, in High Flowability PP (1)/lazy flow PP/ High Flowability PP (2), the more satisfactory thickness of lazy flow PP was more than 1.5 times of aggregate thickness of High Flowability PP (1) and High Flowability PP (2).

Promptly, the thickness of lazy flow PP is during less than 1.5 times of High Flowability PP thickness (being outer in three layers of formation and the total bed thickness of internal layer), be difficult for manifesting the not breakable effect of lazy flow PP during heat-sealing, barrier layere and lead become easy short circuit and can not prevent that root from splitting.

The suitable total thickness of sealing layer is 20 μ m～200 μ m.

Therefore the polypropylene sealing layer of battery use packing material of the present invention when pressurizing window, is necessary to make for sealing layer and lead both sides all to have the lead usefulness film of heat sealability between battery lead portion and exterior body because metal is not had gleyness.For example, shown in Fig. 2 F (a) and Fig. 2 F (b), like that, lead is placed about the pressurizing window portion of lead 4 of battery body 2 (in fact by connect temporarily seal fixing) with film 6, in the insertion exterior body 5, under the state of seizing lead 4 on both sides by the arms, seal by heat-sealing.Can shown in Fig. 2 F (d) or Fig. 2 F (e) like that the film of lead with film 6 be wound on the assigned position of lead 4 with the method for film 6 as lead between lead 4 places.

Specifically, above-mentioned lead with film 6 can adopt sour modified polypropene (unsaturated carboxylic acid graft atactic propene), metal corsslinking polyethylene, ethene and acrylic acid or with the monomer of the copolymer of copolymer, ethene and the vinyl acetate of methacrylic acid derivative or compound etc.

Adopt battery use packing material of the present invention to form exterior body, battery body inserted in this exterior body the heat-sealing periphery and when sealing, the state that seals of wire portion is such shown in Fig. 2 B-A (c) or Fig. 2 B-A (f), each lazy flow PP layer 14r is membranaceous and stays between barrier layere and the lead, and short circuit and the root that can avoid producing as problem of the present invention split.

Battery use packing material is the material that forms the exterior body of battery pack body, according to the form of exterior body the pattern pressing type shown in the bag type shown in Fig. 2 C and Fig. 2 D (a), Fig. 2 D (b), Fig. 2 D (c) is arranged.Have three side sealing mouth, four sides to seal and pillow type etc. in the above-mentioned bag type, Fig. 2 C is the example of pillow type.

Pattern pressing type both can be shown in Fig. 2 D (a) like that, form recess in one side, also can be shown in Fig. 2 D (b) like that, form recess on the two sides and take in the four sides of battery body heat-sealing periphery and seal.In addition, also form recess across bending part in both sides, take in the form that battery seals three limits just like such shown in Fig. 2 D (c).

When battery use packing material was pattern pressing type, like that, the drawing packing 10 of lamination formed recess 7 shown in Fig. 2 E (a)～Fig. 2 E (d).

Then each layer that constitutes battery use packing material of the present invention described.

Above-mentioned substrate layer 11 in the exterior body is made of the polyester or the nylon membrane that stretch, at this moment, as alkide resin polyethylene terephthalate, polybutylene terephthalate, polyphenyl dioctyl phthalate second diester, polyphenyl dioctyl phthalate fourth diester, polyester copolymer, polycarbonate etc. can be arranged.In addition, amilan can be arranged as nylon, promptly the copolymer of nylon 6,

nylon

6,6, nylon 6 and

nylon

6,6,

nylon

6,10, poly---Xlylene adipoyl diamines (MXD6) etc.

When above-mentioned substrate layer 11 is used as battery, owing to be and the position of hardware direct contact that the resin bed that has insulativity basically is better.Consider the pin hole that exists on the film monomer and add the pin hole that produce man-hour, the thickness of substrate layer will be more than 6 μ m, and more satisfactory thickness is 12～30 μ m.

For improving anti-pin hole and insulativity during as the battery exterior body, substrate layer 11 can also laminationizations.

During the lamination substrate layer, substrate layer contains a resin bed more than 2 layers at least, each is thick layer by layer be 6 μ m above, comparatively ideal be 12～30 μ m.As the example of lamination substrate layer, have following 1)～8).

1) nylon of drawn polyethylene terephthalate/stretching.

2) nylon/drawn polyethylene terephthalate of La Shening.

In addition; consider the mechanical comformability (package packing machine of packing; transmission stability in the processing equipment); surface protection (resistance to effect of heat; electrolyte-resistant); secondary processing; when battery is made pattern pressing type with exterior body; the mould when reducing embossing and the friction drag of substrate layer or protection substrate layer when adhering to battery acid can be with the substrate layer multiple stratifications; comparatively ideal is on the substrate layer surface fluorine-type resin layer to be set; the acrylic resin layer; the silicone resin bed; the polyester resin layer; oleamide; erucyl amide; slip agents such as two oleamides or the resin bed that constitutes by these compounds.For example:

5) nylon of fluorine-type resin/drawn polyethylene terephthalate/stretching.

6) nylon of silicone resin/drawn polyethylene terephthalate/stretching.

Above-mentioned barrier layere 12 is for preventing that particularly water vapour is from the Q layer of outside immersion inside battery, be the pin hole of stabilization barrier monomer, and flexibility (adaptability) of operation (bag shapeization, embossing formability) and make it have anti-pin hole, can steam metal or mineral compound films such as the above aluminium of attached thick 15 μ m, nickel, for example, monox, aluminium oxide etc. are 20～80 μ m as the thickness of the comparatively ideal aluminium of barrier layere.

In addition, the aluminium of cold rolling manufacturing is under annealing (so-called annealing in process) condition, though its flexibility intensity hardness can change, aluminium used among the present invention is compared with the hard item for disposal that does not have annealed processing, and the aluminium of soft tendency should what or complete annealed processing be arranged.

The degree of the flexibility intensity hardness of above-mentioned aluminium, promptly Tui Huo condition cooperates flexibility (adaptability) of operation (bag typeization, embossing are shaped) suitably to select to get final product.For example, fold or pin hole when preventing that embossing is shaped, comparatively ideal is to select the soft aluminium of annealing corresponding to the shaping degree for use.

Present inventors find to handle and form protective cover by implement chemical conversion on the surface of barrier layere 12 aluminium, the back side, can realize satisfying the laminated body as above-mentioned packing.Above-mentioned chemical conversion is handled and specifically is meant the resistance to acids overlay film that forms phosphate, chromate, fluoride, cyanuric acid cmpd etc., form in the material at above-mentioned resistance to acids overlay film, adopt the chromium phosphate hydrochlorate gloss finish that constitutes by phenolic resin, charomic fluoride (3) cmpd, tricresyl phosphate kind composition better.In addition, in containing the resinous principle of phenolic resin, there is the chemical conversion inorganic agent of metals such as containing molybdenum, titanium, zircon or slaine better at least.Can obtain following effect by forming above-mentioned resistance to acids overlay film: layering between aluminium and substrate layer when preventing the embossing shaping, can also prevent the dissolving of the electrolyte of battery and hydrogen fluoride that reaction of moisture generates, corrosion aluminium surface, prevent that particularly dissolving, corrosion are present in the lip-deep aluminium oxide of aluminium, and can also improve the gleyness (wetting state) on aluminium surface, the layering that prevents substrate layer 11 when embossing is shaped heat-sealing and aluminium 12, the hydrogen fluoride that prevents to be generated in aluminium inner face side generation layering because of electrolyte and reaction of moisture.

Sealing layer in the battery use packing material of the present invention combines multilayer by lazy flow PP and High Flowability PP, and is High Flowability PP with the innermost layer as previously mentioned. and as the gross thickness of sealing layer, comparatively ideal is to 200 μ m from 20 μ m.

During lamination battery use packing material of the present invention; be located at the bonding of the protective cover of barrier layere and sealing layer; for example in lithium ion battery etc., for the layering that prevents that hydrofluoric acid that battery acid and reaction of moisture produce etc. from causing, comparatively ideal is to carry out following lamination and bonding stabilizing treatment.

Present inventors concentrate on studies to the laminating method that demonstrates stable adhesion intensity, results verification is to such shown in Fig. 2 B (c), the emulsion of acid modified polyolefin is coated to (13h) after above-mentioned chemical conversion processing layer and the drying and sintering, becomes the bind strength that the film of sealing layer also can obtain to stipulate by the lamination methods lamination.

In addition, also confirm by following laminating method and also can obtain stable bind strength.

For example, it is such shown in Fig. 2 B (a), 2B (b), the 2B (e) that one of dried laminate substrate layer 11 and barrier layere 12 looked like, on other faces (chemical conversion processing layer) of barrier layere 12, after extruding acid modified polyolefin 13e and interlayer laminating seal layer 14 form laminated body, or after co-extrusion pressure acid-modified polyolefin resin 13 and sealing layer make laminated body, be heated to by the laminated body that will be obtained more than the temperature of softening point of above-mentioned acid-modified polyolefin resin 13e, can make laminated body with regulation bind strength.

As the concrete grammar of above-mentioned heating, methods such as hot-rolling contact, hot air type, near infrared ray or far-infrared rays are arranged, among the present invention any one method of heating all can, as previously mentioned, above as long as adhering resin can be heated to softening point temperature.

In addition,, when above-mentioned interlayer lamination or co-extrusion pressure lamination, arrive in the surface temperature of the sealing layer side of aluminium 12 under the condition of softening point of acid-modified polyolefin resin and heat, also can obtain the stable laminated body of bind strength as additive method.

In battery use packing material of the present invention, in order to improve the comformability and the stabilization of system film, lamination processing, end article secondary processing (bag typeization, embossing are shaped), also can handle at the suitable surface activations such as corona treatment, sand-blast finish, oxidation treatment, ozone treatment that carry out of above-mentioned each layer in the laminated body that forms exterior body.

C. the third form of the present invention

1. concrete form

Object lesson based on the third form of the present invention can followingly illustrate.Promptly, the inventive features of being put down in writing in the claim 14 is, the packing that insert battery body, form leak free battery exterior body by the heat-sealing circumference are the laminated body that are made of substrate layer, adhesive linkage, aluminium, chemical conversion processing layer, adhering resin layer, polyacrylic resin sealing layer at least, and the adhering resin layer is formed by the resin of fusion index in 5～20g/10 divides scope.The inventive features of being put down in writing in the claim 15 is that the adhering resin layer of being put down in writing in the claim 14 is made of polypropylene-based resin.The inventive features of record is that the adhering resin layer of being put down in writing in claim 14 or the claim 15 is made of sour modified polypropene in the claim 16.The inventive features of record is that the adhering resin layer of being put down in writing in the claim 14 is made of the resin that has added a kind of composition in the following substances in sour modified polypropylene resin at least in the claim 17: ldpe resin, density are 900kg/m ³Low-crystalline ethylene and copolymer, propylene-alpha olefin copolymer, the rubber-like composition of copolymer, amorphism ethene and the propylene of butylene and propylene.The inventive features of being put down in writing in the claim 18 is, the adhering resin layer of being put down in writing in the claim 14 is formed by the resin that has mixed 2 kinds of different polypropylene-based resins of fusion index at least.The inventive features of being put down in writing in the claim 19 is that one of them kind of at least 2 kinds of polypropylene-based resins of the formation adhering resin layer of being put down in writing in the claim 18 is sour modified polypropylene resin.The inventive features of being put down in writing in the claim 20 is, in any battery use packing material of being put down in writing of claim 14～claim 19, above-mentioned laminated body is made of substrate layer, adhesive linkage, chemical conversion processing layer (1) aluminium, chemical conversion processing layer (2), adhering resin layer, polyacrylic resin sealing layer at least.The invention of being put down in writing in the claim 21 is a kind of battery, and battery body is received in the formed exterior body of being put down in writing among by claim 14～claim 20 any one of battery use packing material and is sealed.

2. working of an invention form

Battery use packing material of the present invention is to be in the battery exterior body that sealing layer constituted of acid modified polyolefin layer by substrate layer, adhesive linkage, aluminium, chemical conversion processing layer, adhering resin layer, polyacrylic resin sealing layer at least, at least by making the fusion index that forms above-mentioned adhering resin layer resin within 5～20g/10 branch scope, play the insulativity that guarantees between lead and barrier layere, preventing to produce the effect that root splits.Below, be elaborated with reference to accompanying drawing etc.

Fig. 3 A is a battery use packing material instruction diagram of the present invention, and Fig. 3 A (a) is the cutaway view of battery use packing material layer structure example, and Fig. 3 A (b) is the cutaway view of other layers of battery use packing material structure example.Fig. 3 B is a battery use packing material instruction diagram of the present invention, Fig. 3 B (a) is the battery use packing material that expression is laminar texture, the cutaway view of the mutual alignment relation of lead, Fig. 3 B (b) illustrates at wire portion, the join cutaway view of state of lead before the heat-sealing and exterior body, Fig. 3 B (c) is the schematic sectional view of the wire portion after the heat-sealing, Fig. 3 B (d) is the battery use packing material that expression is laminar texture, the lead film, the cutaway view of the mutual alignment relation of lead, Fig. 3 B (e) is lead before the explanation heat-sealing and lead with the join cutaway view of state of film and exterior body, and Fig. 3 B (f) is the schematic sectional view of the wire portion after sealing.Fig. 3 C is the perspective illustration of battery bag type exterior body.Fig. 3 D is the perspective illustration of battery pattern pressing type exterior body.Fig. 3 E is the shaping instruction diagram of pattern pressing type, and wherein Fig. 3 E (a) is a block diagram, and Fig. 3 E (b) is the exterior body body that embossing is shaped, and Fig. 3 E (c) is the cutaway view at X1-X1 place, and Fig. 1 E (d) is the enlarged drawing at Y1 place.Fig. 3 F is the installation method instruction diagram of battery use packing material and the lead lead when bonding with film.

Require the exterior body of battery have can long term maintenance battery body performance performance, for example, shown in Fig. 3 G (a) like that, form the packing 10 of exterior body ' by various laminatings with substrate layer 11 ', barrier layere 12 ', sealing layer 14 ' etc. lamination form.Particularly, when the sealing layer that constitutes the laminated body of battery exterior body (to call exterior body in the following text) is made of polyolefin resin etc., battery body is received in the exterior body, its periphery sealed and when sealing, part in lead 4 ' existence, for example with acid modified polyolefin as lead with 6 ' time of film, because the heat and the pressure of heat-sealing, such shown in Fig. 3 G (b), make the sealing layer 14 of above-mentioned exterior body ' and lead with film 6 ' all fusions, and because pressurization exterior body 10 ' barrier layere 12 ' with the lead 4 that is made of metal ' S sometimes contacts and be short-circuited.

In addition, shown in Fig. 3 H (a)～Fig. 3 H (c), when the periphery of exterior body was sealed, near the sealing layer the inner edge of mouth-sealed portion 14 ' small root of generation split C sometimes.Split C if produce this root, because battery acid and barrier layere direct contact, phone body 2 ', lead 4 ', barrier layere 12 ' insulativity destroy, produce difference of potential, sometimes barrier layere 12 ' on form because the through hole that corrosion is caused, sometimes form the reactant that is called as the electrolytical metallic ion of dendrite, therefore, shorter battery life.

Present inventors are split and are concentrated on studies preventing above-mentioned short circuit S and preventing near mouth-sealed portion to form root, found that, insert battery body, form the packing of leak free battery exterior body shown in Fig. 3 A (a) by the heat-sealing circumference, at least by substrate layer 11, adhesive linkage 16, barrier layere 12, chemical conversion processing layer 15, adhering resin layer 13, in the laminated body that sealing layer 14 is constituted, or shown in Fig. 3 B (b), at least by substrate layer 11, adhesive linkage 16, chemical conversion processing layer 15 (1), aluminium 12, chemical conversion processing layer (2), adhering resin layer 13, in the laminated body that sealing layer 14 is constituted, by the adhering resin layer is formed by the resin of fusion index in 5～20g/10 branch scope, can solve this problem and finish the present invention thus.

The resin (to call adhering resin in the following text) that forms the adhering resin layer of battery use packing material among the present invention is the resin of lamination barrier layere and sealing layer, be the resin that has with the practical bonding necessary lamination strength of above-mentioned each layer, its fusion index scope is 5～20g/10 branch.

Above-mentioned fusion index (to call MI in the following text) is measured according to JISK7210.

Among the present invention, used resin when being single resin bed as the adhering resin layer, comparatively ideal be adopt acid modified polyolefin, metal corsslinking polyethylene, ethene and acrylic acid such as sour modified poly ethylene, sour modified polypropene or with the copolymer of copolymer, ethene and the vinyl acetate of methacrylic acid derivative etc. and its MI all in 5～20g/10 branch scope.

The adhering resin layer is that fusion index (to call MI in the following text) surpasses the resin formation battery use packing material that 20g/10 divides, and in the heat-sealing of battery packages, may be short-circuited at wire portion, also may produce root near mouth-sealed portion in addition and split.In addition, the adhering resin layer is the polypropylene-based resin that less fusion index (to call MI in the following text) 0.3～3g/10 divides, and the film speed of interlayer lamination or co-extrusion pressure lamination can reduction, membrane thickness unevenness and produce uneven thickness.

When interlayer lamination or co-extrusion pressure lamination, in order to keep productivity, adopt the big sour modified polypropene of fusion index as adhering resin at present, but adopt the exterior body that laminated body constituted by this adhering resin lamination, take in battery body, at 190 ℃, 1.0MPa, heat-sealing under the usual conditions of 3sec and when sealing, such shown in Fig. 3 H (c), the approaching part of delay resin t that is produced in the merging portion with mouth-sealed portion can produce root and split C, because battery acid splits C from this root and soaks into and barrier layere 12 direct contacts, the metal of lead 4 and the insulativity between barrier layere are destroyed, produce difference of potential at this place, sometimes form the through hole that is caused by corrosion on barrier layere 12, formation sometimes is called as the electrolytical metallic ion reactant of dendrite, and therefore battery life shortens sometimes.Can think above-mentioned split C be because, the tendency that crystallization is arranged by the adhering resin layer 13 of closure part and sealing layer 14 (fusing a layer Mx for heat altogether) in above-mentioned heat-sealing, relative therewith, non-mouth-sealed portion is the noncrystalline state always, so intersection part resin generates root easily and splits C and become unsure state.

Though the fusion index of the adhering resin layer in the battery use packing material of the present invention is 5～20g/10 branch, the adhering resin layer be can't help the mono-resin and is formed also passable.For example in sour modified polypropene, add LDPE with good, the big MI of system film, density is 900kg/m ³Rubber constituents such as the copolymer of the ethene of following low crystallization and copolymer, amorphism ethene and the propylene of butylene and propylene, propylene-alpha olefin copolymer, butadidenne are divided as long as apparent fusion index described later is 5～20g/10.

In addition,, form by the similar resin more than 2 kinds with different MI as the adhering resin layer in the battery use packing material of the present invention, for example can the polypropylene resinoid.At this moment, be sour modified polypropene by making arbitrary polypropylene-based resin at least, can guarantee bind strength with the polypropylene type sealing layer.Here, can adopt the ter-polymer resin of equal chain polypropylene, random polypropylene, block type polypropylene, propylene and ethene and butene polymerization as the polypropylene in the above-mentioned polypropylene-based resin.In addition, sour modification is meant the graft polymerization unsaturated carboxylic acid.

Among the present invention, during resin, the more satisfactory apparent MI scope of mixed resin is 5～20g/10 branch more than 2 kinds in such mixing.The measuring method of MI can be distinguished according to JISK7210.

As mentioned above, by making the fusion index that forms adhering resin layer resin in 5～20g/10 branch scope, for example, compare with the resin of fusion index in 22～30 scopes, can reduce the resin flows and and the bed thickness of the adhering resin layer of sealing layer after keeping together sealing of heat sealing resin as adhering resin.For example, like that, after the heat-sealing, adhering resin layer 13 and sealing layer 14 are membranaceous staying between barrier layere 12 and the lead 4 and keep insulativity shown in Fig. 3 B (a), Fig. 3 B (b) and Fig. 3 B (c).In addition, such shown in Fig. 3 B (d), Fig. 3 B (e) and Fig. 3 B (f), make lead with film 6 between the laminated body 10 of exterior body and lead 4 time, even heat-sealing back lead film 6 fusions, adhering resin layer 13 and sealing layer 14 are membranaceous to be stayed between barrier layere 12 and the lead 4, also can keep insulativity.The result can prevent the short circuit S between barrier layere 12 and the lead 4.

In addition, can prevent that generation is detained resin t and is split C at the end of this delay resin t generation root near the mouth-sealed portion inner edge.Among the present invention, be reduced to 5～20g/10 branch by fusion index with the adhering resin layer, even seal at heat seal condition lower seal same as described above, the adhering resin layer 13 that above-mentioned heat fuses among layer Mx can attenuation yet, does not produce the above-mentioned effect of splitting C thereby have.

Battery use packing material is the material that forms the exterior body of battery pack body, according to the form of exterior body such pattern pressing type shown in as shown in Figure 3 bag type, Fig. 3 D (a), Fig. 3 D (b) or Fig. 3 D (c) is arranged.Have three side sealing mouth, four sides to seal and form such as pillow type in the above-mentioned bag type, Fig. 3 is the example of pillow type.

Pattern pressing type both can be shown in Fig. 3 D (a) like that, form recess in one side, also can be shown in Fig. 3 D (b) like that, form recess on the two sides and take in the four sides of battery body heat-sealing periphery and seal.In addition, also form recess across bending part in both sides, take in the form that battery seals three limits just like such shown in Fig. 3 D (c).When battery use packing material was pattern pressing type, like that, the drawing packing 10 of lamination formed recess 7 shown in Fig. 3 E (a)～Fig. 3 E (d).

Battery use packing material of the present invention is such shown in Fig. 3 A (a), be at least by substrate layer 11, adhesive linkage 16, aluminium 12, chemical conversion processing layer 15, adhesive linkage 13d, multi-layer sealed layer 14 laminated body that is constituted, in addition, when exterior body described later is pattern pressing type, like that, above-mentioned laminated body is substrate layer 11, adhesive linkage 16, chemical conversion processing layer 15 (1), aluminium 12, chemical conversion processing layer 15 (2), adhesive linkage 13d, multi-layer sealed layer 14 shown in Fig. 3 A (b).

Among the present invention, when laminated cell was used packing, the chemical conversion processing layer and the bonding of sealing layer that are located on the barrier layere were finished by the interlayer laminating or the co-extrusion pressure laminating that adopt the adhering resin layer.At this moment, cause layering in order to prevent battery acid and reaction of moisture are produced in lithium ion battery etc. hydrofluoric acid etc., comparatively ideal is to carry out following bonding stabilizing treatment.

For example, such shown in Fig. 3 A (a), the one side of substrate layer 11 and barrier layere 12 is carried out dried lamination 16, and go up extruding acid modified polyolefin 13 and during interlayer laminating seal layer 14 at other faces (chemical conversion processing layer 15) of barrier layere 12, or after co-extrusion pressure acid-modified polyolefin resin 13 and sealing layer 14 become laminated body, the laminated body that is obtained is heated to more than the softening point temperature of above-mentioned sour modified polypropylene resin 13, can makes laminated body with regulation bind strength.

The capillary chemistry conversion process layer 15 of barrier layere 12 like that, can be located at the two sides of barrier layere 12 shown in Fig. 3 A (b).As the concrete grammar of above-mentioned heating, methods such as hot-rolling contact, hot air type, near infrared ray or far-infrared rays are arranged, among the present invention any one method of heating all can, as previously mentioned, above as long as adhering resin can be heated to softening point temperature.In addition,, when above-mentioned interlayer lamination or co-extrusion pressure lamination, arrive in the surface temperature of the sealing layer side of aluminium 12 under the condition of softening point of sour modified polypropylene resin and heat, also can make the stable laminated body of bind strength as additive method.

As the lead of battery, be to constitute by elongated tabular or bar-shaped metal, as tabular lead, thickness is that 50～2000 μ m, width are about 2.5～20mm, its material is ALM, Cu (containing plating Ni), Ni etc.

When the sealing layer of battery use packing material of the present invention does not have thermal bonding to metal, such shown in Fig. 3 B (d) or each figure of Fig. 3 F, when pressurizing window, be necessary to make for sealing layer 14 and lead 4 both sides all to have the lead usefulness film 6 of heat sealability between battery lead 4 and laminated body 10.As lead with film between method, for example, can be shown in Fig. 3 F (a) and Fig. 3 F (b) like that, lead is placed with film 6 about the pressurizing window portion of lead 4 of battery body 2 (in fact by connect temporarily seal fixing), insert in the exterior body 5, seal by heat-sealing seizing on both sides by the arms under the state of wire portion.Can be shown in Fig. 3 F (d) or Fig. 3 F (e) like that between the method at lead 4 places as lead with film 6, lead is wound on the film of film 6 on the assigned position of lead 4 and gets final product.

Battery use packing material is the material that forms the exterior body of battery pack body, according to the form of exterior body such pattern pressing type shown in bag type such shown in Fig. 3 C, Fig. 3 D (a), Fig. 3 D (b) or Fig. 3 D (c) is arranged.Have three side sealing mouth, four sides to seal and form such as pillow type in the above-mentioned bag type, Fig. 3 is the example as the pillow type.

Then, each layer that constitutes battery use packing material of the present invention described.Above-mentioned substrate layer 11 in the exterior body is made of the polyester or the nylon membrane that stretch, at this moment, can list polyethylene terephthalate, polybutylene terephthalate, polyphenyl dioctyl phthalate second diester, polyphenyl dioctyl phthalate fourth diester, polyester copolymer, polycarbonate etc. as alkide resin.In addition, can list amilan as nylon, promptly the copolymer of nylon 6,

nylon

6,6, nylon 6 and

nylon

6,6,

nylon

6,10, poly---Xlylene adipoyl diamines (MXD6) etc.

Above-mentioned substrate layer 11 is during as battery, owing to be the position with the hardware direct contact, is to have the resin bed of insulativity better basically.Consider the pin hole that exists on the film monomer and add the pin hole that produce man-hour, the thickness of substrate layer will be for more than the 6 μ m, and more satisfactory thickness is 12～30 μ m.

During the lamination substrate layer, substrate layer contains a resin bed more than 2 layers at least, the bed thickness of each layer be 6 μ m above, comparatively ideal be 12～30 μ m.As the example of lamination substrate layer, have following 1)～8).

1) nylon of drawn polyethylene terephthalate/stretching.

2) nylon/drawn polyethylene terephthalate of La Shening.

In addition; consider mechanical comformability (the transmission stability in package packing machine, the processing equipment), surface protection (resistance to effect of heat, electrolyte-resistant), the secondary processing of packing; when battery is made pattern pressing type with exterior body; the mould when reducing embossing and the friction drag of substrate layer or protection substrate layer when adhering to battery acid, can with the substrate layer multiple stratification, comparatively ideal be the resin bed that fluorine-type resin layer, acrylic resin layer, silicone resin bed, polyester resin layer is set or constitutes on the substrate layer surface by these compounds.For example:

3) fluorine-type resin/drawn polyethylene terephthalate (fluorine-type resin, the dry formation in membranaceous or aqueous coating back).

4) silicone resin/drawn polyethylene terephthalate (silicone resin, the dry formation in membranaceous or aqueous coating back).

5) nylon of fluorine-type resin/drawn polyethylene terephthalate/stretching.

6) nylon of silicone resin/drawn polyethylene terephthalate/stretching.

7) nylon of acrylic resin/stretching (acrylic resin, the dry sclerosis in membranaceous or aqueous coating back).

8) nylon of acrylic resin+polysiloxane-grafted class acrylic resin/stretching (acrylic resin, the dry sclerosis in membranaceous or aqueous coating back).

Above-mentioned barrier layere 12 is for preventing that particularly water vapour is from the layer of outside immersion inside battery, be the pin hole of stabilization barrier monomer, and flexibility (adaptability) of operation (bag shapeization, embossing formability) and make it have anti-pin hole, can steam the film of metal such as the above aluminium of attached thick 15 μ m, nickel or mineral compound, for example, monox, aluminium oxide etc., comparatively ideal as barrier layere is the aluminium of 20～80 μ m thickness.

Present inventors find to handle by implementing chemical conversion at surface, the back side of barrier layere 12 aluminium, can realize satisfying the laminated body as above-mentioned packing.Above-mentioned chemical conversion is handled and specifically is meant, form the resistance to acids overlay film of phosphate, chromate, fluoride, cyanuric acid cmpd etc., form in the material at above-mentioned resistance to acids overlay film, adopt the chromium phosphate hydrochlorate gloss finish that constitutes by phenolic resin, charomic fluoride (3) cmpd, tricresyl phosphate kind composition better.In addition, in containing the resinous principle of phenolic resin, there is the chemical conversion inorganic agent of metals such as containing molybdenum, titanium, zircon or slaine better at least.Can obtain following effect by forming above-mentioned resistance to acids overlay film: layering between aluminium and substrate layer when preventing the embossing shaping, can also prevent that the dissolving of the electrolyte of battery and hydrogen fluoride that reaction of moisture is generated, corrosion aluminium surface from preventing that particularly dissolving, corrosion are present in the lip-deep aluminium oxide of aluminium, and can also improve the gleyness (wetting state) on aluminium surface, the layering that prevents substrate layer 11 when embossing is shaped heat-sealing and aluminium 12, the hydrogen fluoride that prevents to be generated in aluminium inner face side generation layering because of electrolyte and reaction of moisture.

Adhering resin layer 13 when bonding, is the resin that molten state is extruded by interlayer laminating or co-extrusion pressure laminating with barrier layere 12 and sealing layer 14 as mentioned above, and its MI scope is 5～20.

Can adopt the sealing layer as battery use packing material of the present invention such as polythylene resin, polypropylene-based resin.Can adopt equal chain polypropylene, random polypropylene, block type polypropylene etc. as polypropylene-based resin.Sealing layer can be made of two-layer above multilayer as required.The suitable gross thickness of sealing layer is 20 μ m～200 μ m.

D. the 4th kind of form of the present invention

1. concrete form

Concrete example based on the invention of the 4th kind of form of the present invention can carry out following explanation.Promptly, the inventive features of record is in the claim 22, the battery use packing material that inserts battery body, forms leak free battery exterior body by the heat-sealing circumference is at least by substrate layer, adhesive linkage 1, barrier layere, adhesive linkage 2, laminated body that sealing layer constituted, and sealing layer is formed by the resin bed lamination of the wire low density polyethylene (LDPE) that contains class of metallocenes more than one deck at least.The inventive features of record is in the claim 23, and the sealing layer of record is formed by class of metallocenes wire ldpe resin in the claim 22.The inventive features of record is in the claim 24, and the sealing layer of record is formed by the polythylene resin that contains the class of metallocenes wire low density polyethylene (LDPE) more than 10% in the claim 21.The inventive features of record is in the claim 25, and the sealing layer of record is made of multilayer in the claim 22, wherein contains the layer that is made of class of metallocenes wire ldpe resin at least.The inventive features of record is in the claim 26, and the sealing layer of record is made of the multilayer that contains the polythylene resin layer in the claim 21, and wherein, the polythylene resin layer contains the class of metallocenes wire low density polyethylene (LDPE) more than 10%.The inventive features of record is in the claim 27, and the adhesive linkage 2 of record forms by doing laminating in the claim 22.The inventive features of record is in the claim 28, and the adhesive linkage 2 of record is the coating sintering layer of acid modified polyolefin in the claim 22.The inventive features of record is in the claim 29, and the adhesive linkage 2 of record is the extruded layer of acid modified polyolefin in the claim 22.

2. working of an invention form

Battery use packing material of the present invention is at least by substrate layer, adhesive linkage, chemical conversion processing layer 1, aluminium, chemical conversion processing layer 2, battery exterior body that adhesive linkage, sealing layer constituted, by making sealing layer contain class of metallocenes wire low density polyethylene (LDPE) (to call class of metallocenes LLDPB in the following text) resin at least, can obtain stable embossing processability and seal comformability.

In addition, can make the packing that layering does not take place by the method for lamination aluminium and sealing layer.Followingly be elaborated with reference to accompanying drawing etc.

Fig. 4 A is the instruction diagram of battery use packing material of the present invention, and Fig. 4 A (a) is the cutaway view of laminated body embodiment, and Fig. 4 A (b) is the cutaway view of other laminated body embodiment.Fig. 4 B is the formation instruction diagram of sealing layer, and Fig. 4 B (a) is an individual layer sealing layer cutaway view, and Fig. 4 B (b) is 2 layers of sealing layer cutaway view, the cutaway view when Fig. 4 B (c) is 3 layers of sealing layer.Fig. 4 C is the cutaway view of the different laminating methods of battery use packing material of the present invention, and Fig. 4 C (a) is a lamination methods for dried laminating, Fig. 4 C (b), and Fig. 4 C (c) is the interlayer laminating, and Fig. 4 C (d) is the co-extrusion pressure laminating.Fig. 4 D is the perspective illustration of battery bag type exterior body.Fig. 4 E is that the pattern pressing type exterior body of battery is a perspective illustration.Fig. 4 F is the perspective illustration of pattern pressing type exterior body.Fig. 4 F (a) is a block diagram, and Fig. 4 F (b) is the exterior body body that embossing is shaped, and Fig. 4 F (c) is the cutaway view at X2-X2 place, and Fig. 4 F (d) is the enlarged drawing at Y1 place.

As battery use packing material, be the laminated body that constitutes by substrate layer, barrier layere, sealing layer at least.And confirmed above-mentioned each bind strength between layer by layer and can influence as the necessary character of battery exterior body.For example, the inadequate words of the bind strength of barrier layere and sealing layer, can become the reason that moisture immerses from the outside, the hydrofluoric acid that electrolyte in the formation battery component and above-mentioned reaction of moisture are generated can corrode above-mentioned aluminium face, between barrier layere and sealing layer layering takes place.In addition, when forming above-mentioned pattern pressing type exterior body, the above-mentioned exterior body of drawing forms recess, between substrate layer and barrier layere layering takes place sometimes when being shaped.

Battery use packing material is such shown in Fig. 4 A (a), it is the laminated body that is constituted by substrate layer 11, adhesive linkage 16, aluminium 12, chemical conversion processing layer 15, adhesive linkage 13, sealing layer 14 at least, in addition, when exterior body is pattern pressing type, like that, above-mentioned laminated body is substrate layer 11, adhesive linkage 16, chemical conversion processing layer 15 (1), aluminium 12, chemical conversion processing layer 15 (2), adhesive linkage 13, sealing layer 14 shown in Fig. 4 A (b).

When exterior body was pattern pressing type, when using the high resin of tensile elasticity rate as sealing layer, in embossing was shaped, sealing layer emulsification sometimes produced slight crack on its surface sometimes, and in addition, shape stability is poor, produces pin hole, shaping fold or crack sometimes.

Also have, as battery use packing material indispensable performance, the pressurizing window after the meaningful thing of giving an example is filled, sealed.For example, when the sealing-strength of packing hangs down, spend adequate time and on content filling sealing production line, seal, obviously hinder circulation sometimes and shorten, make the production efficiency deterioration.

Present inventors found that through concentrating on studies, the packing that insert battery body, form leak free battery exterior body by the heat-sealing circumference shown in Fig. 4 A (a) like that, laminated body is made of substrate layer 11, adhesive linkage 16, barrier layere 12, chemical conversion processing layer 15, adhesive linkage 13, sealing layer 14, sealing layer 14 by making this laminated body is the resin bed that contain class of metallocenes wire low density polyethylene (LDPE) of lamination more than 1 layer at least, can solve this problem and finish the present invention.

Above-mentioned class of metallocenes wire low density polyethylene (LDPE) is to use the polyethylene of metalloscene catalyst (single-point catalyst) polymerization, compares with general wire low density polyethylene (LDPE), and the branch of side chain is few, being evenly distributed of mol wt and comonomer.Therefore, have good characteristics such as the transparency is high, fusing point is low, Dent resistance is good.

Sealing layer to the battery use packing material among the present invention describes.In sealing layer, like that, the above-mentioned resin bed that contains the wire low density polyethylene (LDPE) of class of metallocenes can be the individual layer S that forms of the wire ldpe resin (to call MLL in the following text) by class of metallocenes or also can be the individual layer S that mixes the above MLL polythylene resin formation of 10 weight % shown in Fig. 4 B (a).When mixing above-mentioned MLL polythylene resin, the mixture ratio of MLL is less than 10 weight %, not as the effect of the raising formability of problem of the present invention.

In addition, the sealing layer of battery use packing material is such shown in Fig. 4 B (b) among the present invention, constitute 2 layers by resin bed S3 that above-mentioned MLL constituted and other the resin bed S2 that MLL constituted, also can be shown in Fig. 4 B (c) like that, add by the formed S1 of other MLL and constitute 3 layers.By resin bed S1～S3 that above-mentioned MLL constitutes, can be the polythylene resin layer that has mixed MLL, but still be that MLL is more satisfactory as the resin bed S3 of innermost layer.

In the present invention, such shown in Fig. 4 B (b) or Fig. 4 B (c), when sealing layer 14 is by MLL layer S3 or contains the hybrid resin layer S3 of the MLL resin more than the 10 weight % and during multilayer that other layers S1, S2 constitute, as the resin that forms other layers S1, S2, can adopt low density polyethylene (LDPE), medium density polyethylene, high density polyethylene (HDPE), polypropylene-based resin or with unsaturated carboxylic acid with the acid modified polyolefin of these resin grafting etc.

Among the present invention, when sealing layer 14 was multilayer by MLL layer or the hybrid resin layer (to call the MLL mixolimnion in the following text) that contains the MLL resin more than the 10 weight % and other layers formation, the more satisfactory thickness of above-mentioned MLL layer or MLL mixolimnion was more than 15% of sealing layer gross thickness at least.The thickness of MLL layer or MLL mixolimnion did not have the effect of formability raising less than 15% o'clock of the sealing layer gross thickness.

When forming battery use packing material laminated body of the present invention,, can adopt dried laminating, interlayer laminating, co-extrusion pressure laminating, lamination methods etc. as the laminating method of barrier layere and sealing layer.

Present inventors concentrate on studies to the laminating method that presents stable adhesion intensity, results verification is to the bind strength that also can obtain to stipulate by the following method: at least behind barrier layere 12 and substrate layer 11 that dried lamination chemical conversion on the face of laminating seal layer was handled, as being arranged on the chemical conversion processing layer on the barrier layere and the adhering method of sealing layer, can be shown in Fig. 4 C (a) like that, with dried laminating lamination 13d, or such emulsion with sour modified polypropene is coated to above-mentioned chemical conversion processing layer and dry shown in Fig. 4 C (b), behind the sintering (13h), will be as the class of metallocenes LLDPE film lamination methods lamination of sealing layer.

In addition, confirm the following laminating method of employing and also can obtain stable bind strength.

Promptly, dried laminate substrate layer 11 and implemented one of barrier layere 12 that chemical conversion handles on the two sides and looked like shown in Fig. 4 C (c) like that, on other faces of barrier layere 12, push sour modified poly ethylene 13es, interlayer laminating seal layer 14 again, or shown in Fig. 4 C (d), co-extrusion pressure acid modified polyvinyl resin 13ec and make laminated body as the class of metallocenes LLDPE resin of sealing layer 14, and this laminated body is heated to more than the softening point temperature of above-mentioned sour modified polyvinyl resin, can obtain to have the laminated body of the bind strength of regulation like this.

In addition,, when above-mentioned interlayer lamination or co-extrusion pressure lamination, arrive in the surface temperature of the sealing layer side that is heated to aluminium 12 under the state of softening point of acid-modified polyolefin resin, also can obtain the stable laminated body of bind strength by lamination process as additive method.In addition, also can adopt poly-vinyl resin as adhering resin, at this moment, the actv. laminating method is the ozone treatment boundary layer to be carried out on the laminate surface limit of the aluminium side of the polyethylene molten resin film that pushed press.

Also having a kind of method is dried laminate substrate layer 11 and the one side of having implemented the barrier layere 12 of chemical conversion processing on the two sides, such shown in Fig. 4 C (c), on other faces of barrier layere 12, only push sour modified poly ethylene 13es as the intermediate laminate body, this intermediate laminate body is heated to more than the temperature of softening point of above-mentioned sour modified polyvinyl resin, extruding is made laminated body as the class of metallocenes LLDPE resin of sealing layer 14.Above-mentioned twice extruding both can use the cascade machine series connection to carry out, and also can use the non-series connection of general extrusion press to carry out.

Though heating also can be carried out behind the luxuriant class LLDPE resin of extrusion metal, but resemble above-mentioned the extruding sour modified poly ethylene 13es after (before the luxuriant class LLDPE resin of extrusion metal) carry out, owing to can not damage the sliding of laminated body sealing layer 14, so that embossing adds the formability in man-hour is better.

As mentioned above, the present invention can prevent the layering of barrier layere and sealing layer (or adhering resin layer), in addition by adopting said method, by sealing layer is made of class of metallocenes LLDPE or the resin that contains class of metallocenes LLDPE, can prevent fold and pin hole in the embossing forming process.In addition, use above-mentioned sealing layer to compare, owing to can obtain big sealing-strength, therefore improving leak tightness or shortening and brought into play effect extremely significantly aspect circulation, shaping quality and the raising productivity of filling in the sealing process with general LLDPE.

Battery use packing material is the material that forms the exterior body of battery pack body, according to the form of exterior body the pattern pressing type shown in the bag type shown in Fig. 4 D and Fig. 4 E (a), Fig. 4 E (b), Fig. 4 E (c) is arranged.Have three side sealing mouth, four sides to seal and pillow type etc. in the above-mentioned bag type, Fig. 4 D is the example of pillow type.

Pattern pressing type both can be shown in Fig. 4 E (a) like that, form recess in one side, also can be shown in Fig. 4 E (b) like that, form recess on the two sides and take in the four sides of battery body heat-sealing periphery and seal.In addition, also form recess across bending part in both sides, take in the form that battery seals three limits just like such shown in Fig. 4 E (c).When battery use packing material was pattern pressing type, like that, the drawing packing 10 of lamination formed recess 7 shown in Fig. 4 F (a)～Fig. 4 F (d).

Above-mentioned substrate layer 11 in the exterior body is made of the polyester or the nylon membrane that stretch, at this moment, can list polyethylene terephthalate, polybutylene terephthalate, polyphenyl dioctyl phthalate second diester, polyphenyl dioctyl phthalate fourth diester, polyester copolymer, polycarbonate etc. as alkide resin.In addition, can list amilan as nylon, promptly the copolymer of nylon 6,

nylon

6,6, nylon 6 and

nylon

6,6,

nylon

6,10, poly---Xlylene adipoyl diamines (MXD6) etc.

Above-mentioned substrate layer 11 is during as battery, owing to be the position with the hardware direct contact, is to have the resin bed of insulativity better basically.Consider the pin hole that exists on the film monomer and add the pin hole that produces man-hour etc., the thickness of substrate layer will be for more than the 6 μ m, and more satisfactory thickness is 12～30 μ m.

1) nylon of drawn polyethylene terephthalate/stretching.

2) nylon/drawn polyethylene terephthalate of La Shening; in addition; consider the mechanical comformability (package packing machine of packing; transmission stability in the processing equipment); surface protection (resistance to effect of heat; electrolyte-resistant); secondary processing; when battery is made pattern pressing type with exterior body; the mould when reducing embossing and the friction drag of substrate layer or protection substrate layer when adhering to battery acid can be with the substrate layer multiple stratifications; comparatively ideal is on the substrate layer surface fluorine-type resin layer to be set; the acrylic resin layer; the silicone resin bed; the polyester resin layer; oleamide; erucyl amide; slip agents such as two oleamides or the resin bed that constitutes by these compounds.For example:

5) nylon of fluorine-type resin/drawn polyethylene terephthalate/stretching.

6) nylon of silicone resin/drawn polyethylene terephthalate/stretching.

Above-mentioned barrier layere 12 is for preventing that particularly water vapour is from the layer of outside immersion inside battery; be the pin hole of stabilization barrier monomer, and flexibility (adaptability) of operation (bag shapeization, embossing formability) and make it have anti-pin hole; can steam the film of metal such as the above aluminium of attached thick 15 μ m, nickel or mineral compound, for example; monox, aluminium oxide etc., comparatively ideal as barrier layere is that aluminium with 20～80 μ m preferred thickness is that base forms protective cover described later.

For the generation that further improves pin hole, and when the battery exterior body made pattern pressing type embossing do not produce crack etc. in being shaped, present inventors by the iron level in the material that makes the aluminium that uses as barrier layere be 0.3～9.0 weight %, comparatively ideal be 0.7～2.0 weight %, compare with nonferrous aluminium, the ductility of finding aluminium is good, as laminated body, the caused pin hole of bending reduces, and sidewall can form easily when being shaped above-mentioned pattern pressing type exterior body.Above-mentioned iron level be can't see and prevented that pin hole from effects such as embossing formability taking place, improving during less than 0.3 weight %, when the iron level of above-mentioned aluminium surpasses 9.0 weight %, is hindered as the flexibility of aluminium, as the deterioration of laminated body bag.

Present inventors find that forming protective cover by surface, the back side at barrier layere 12 aluminium implements the chemical conversion processing, can realize satisfying the laminated body as above-mentioned packing.Above-mentioned chemical conversion is handled and specifically is meant, form the resistance to acids overlay film of phosphate, chromate, fluoride, cyanuric acid cmpd etc., form in the material at above-mentioned resistance to acids overlay film, adopt the chromium phosphate hydrochlorate gloss finish that constitutes by phenolic resin, charomic fluoride (3) cmpd, tricresyl phosphate kind composition better.In addition, in containing the resinous principle of phenolic resin, there is the chemical conversion inorganic agent of metals such as containing molybdenum, titanium, zircon or slaine better at least.Can obtain following effect by forming above-mentioned resistance to acids overlay film: layering between aluminium and substrate layer when preventing the embossing shaping, can also prevent that the dissolving of the electrolyte of battery and hydrogen fluoride that reaction of moisture generates, corrosion aluminium surface from preventing that particularly dissolving, corrosion are present in the lip-deep aluminium oxide of aluminium, and can also improve the gleyness (wetting state) on aluminium surface, the layering that prevents substrate layer 11 when embossing is shaped heat-sealing and aluminium 12, the hydrogen fluoride that prevents to be generated in aluminium inner face side generation layering because of electrolyte and reaction of moisture.

Adopt various materials, implementing chemical conversion on the aluminium face handles, its effect is discovered, formed at above-mentioned resistance to acids overlay film and adopt the chromium phosphate hydrochlorate gloss finish that constitutes by phenolic resin, charomic fluoride (3) cmpd, tricresyl phosphate kind composition better in the material.

In the battery use packing material of the present invention, the adhering resin layer when utilizing interlayer laminating or co-extrusion pressure laminating lamination barrier layere and sealing layer is preferably and adopts sour modified poly ethylene.The acid modified poly ethylene is the polyethylene of grafting unsaturated carboxylic acid polymerization, with the face of the chemical conversion processing layer of barrier layere and the laminate surface resin of sealing layer good gleyness is arranged all.

Sealing layer in the battery use packing material of the present invention is the individual layer that is made of class of metallocenes PE resin as mentioned above, or by the individual layer that the resin that has mixed class of metallocenes PE constitutes, perhaps constitutes by containing above-mentioned single layer multilayer at least.

In battery use packing material of the present invention, in order to improve the comformability and the stabilization of system film, lamination processing, end article secondary processing (bag typeization, embossing are shaped), also can suitably carry out surface activations such as corona treatment, sand-blast finish, oxidation treatment, ozone treatment at above-mentioned each layer in the laminated body that forms exterior body and handle.

Embodiment

A. first kind of form of the present invention

Battery use packing material based on first kind of form of the present invention further specifies by embodiment.

Common conditions A

The common conditions of embodiment A and Comparative examples A is as follows:

(1) exterior body

In following embodiment A and Comparative examples A,, be of a size of wide 30mm, long 50mm (being the inner face size) as bag type exterior body.In addition, during for the pattern pressing type exterior body, being the single-side embossing type, is the shape of 30mm * 50mm, dark 3.5mm with recess (die cavity) drawing of shaping die, estimates formability then.

(2) gross thickness of sealing layer

All be 30 μ m.

(3) chemical conversion is handled

When the barrier layere of exterior body was implemented the chemical conversion processing, embodiment A and Comparative examples A were conditioning fluid with the aqueous system that is made of phenolic resin, charomic fluoride (3) cmpd, phosphoric acid all, with the coating of roll coated method, and at the overlay film sintering temperature more than 180 ℃.The coating amount of chromium is 2mg/m ²(dry weight).

(4) lead and lead film

The lead of embodiment A and Comparative examples A is thick 100 μ m, wide 6mm, long 25mm.All is after sour modified polypropene film with 30 μ m is wound on the assigned position of lead as lead with film, and battery body is inserted separately exterior body.

(5) heat seal condition

The condition of heat-sealing is 190 ℃, 1Mpa, 3sec.

But only the heat seal condition when estimating short circuit is 190 ℃, 2Mpa, 5sec.

Embodiment A 1

Implement chemical conversion on the two sides of the aluminium of 20 μ m and handle, on the face that chemical conversion was handled,, then, on another face of the aluminium that chemical conversion was handled, use dried laminating adhesive seal layer with the polyester film (thick 12 μ m) of doing the bonding stretching of laminating.Form pillow pouch with resulting laminated body as exterior body.

Sealing layer is lazy flow PP＜6 〉/High Flowability PP (inner face side)＜42 layers, each PP is as follows.＜the bed thickness ratio of interior numeric representation co-extrusion pressure multilayer, following embodiment A, Comparative examples A are too.

Lazy flow PP, MI 0.59/10min, 147 ℃ of fusing points

High Flowability PP, MI 20g/10min, 160 ℃ of MP

Battery body is inserted in the above-mentioned exterior body, makes test sample embodiment A 1 by the heat-sealing sealing.

Embodiment A 2

Implement chemical conversion on the two sides of the aluminium of 40 μ m and handle, on the face that chemical conversion was handled,, then, on another face of the aluminium that chemical conversion was handled, use dried laminating adhesive seal layer with the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating.Form pallet with resulting laminated body by the embossing shaping.With deformed laminated body is that lid obtains the pattern pressing type exterior body.

Sealing layer is lazy flow PP＜9 〉/High Flowability PP (inner face side)＜12 layers, each PP is as follows.

Lazy flow PP, MI 3g/10min, 147 ℃ of fusing points

High Flowability PP, MI 7g/10min, 147 ℃ of fusing points

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample embodiment A 2.

Embodiment A 3

Sealing layer be High Flowability PP 1.＜1/lazy flow PP＜8/High Flowability PP (inner face side) 2.＜13 layers, each PP is as follows.

High Flowability PP 1., MI 10g/10min, 147 ℃ of fusing points

Lazy flow PP, MI 1g/10min, 160 ℃ of fusing points

High Flowability PP 2., MI 10g/10min, 147 ℃ of fusing points

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample embodiment A 3.

Embodiment A 4

Sealing layer be High Flowability PP 1.＜1/lazy flow PP＜6/High Flowability PP (inner face side) 2.＜33 layers, each PP is as follows.

High Flowability PP 1., MI 20g/10min, 147 ℃ of fusing points

Lazy flow PP, MI 3g/10min, 160 ℃ of fusing points

High Flowability PP 2., MI 8, MP 147

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample embodiment A 4.

Comparative examples A 1

Sealing layer is lazy flow PP＜2 〉/High Flowability PP (inner face side)＜82 layers, each PP is as follows.

Lazy flow PP, MI 3g/10min, 147 ℃ of fusing points

High Flowability PP, MI 7g/10min, 147 ℃ of fusing points

Battery body is inserted in the above-mentioned exterior body, makes test sample Comparative examples A 1 by the heat-sealing sealing.

Comparative examples A 2

Sealing layer is the High Flowability PP individual layer.

High Flowability PP, MI 20g/10min, 160 ℃ of fusing points

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample Comparative examples A 2.

Comparative examples A 3

On the aluminium face of 40 μ m, do not implement chemical conversion and handle, on an aluminium face,, then, on another aluminium face, use and do laminating adhesive seal layer with the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating.Form pallet with resulting laminated body by the embossing shaping.With deformed laminated body is that lid obtains the pattern pressing type exterior body.

Sealing layer be High Flowability PP 1.＜1/lazy flow PP＜8/High Flowability PP (inner face side) 2.＜1) 3 layers, each PP is as follows.

High Flowability PP 1., MI 10g/10min, 147 ℃ of fusing points

Lazy flow PP, MI 1g/10min, 160 ℃ of fusing points

High Flowability PP 2., MI 10, MP 147

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample Comparative examples A 3.

Evaluation method A

(1) lead and the exterior body barrier layere is short circuited has or not

Cut apart with a knife or scissors the heat-sealing portion of wire portion, confirm the short-circuit condition of wire portion and exterior body by cross-section photograph, to the barrier layere of possible lead of short circuit and exterior body is arranged, confirm whether to contact with multi-meter, pass through cross-section photograph, between the barrier layere of lead and exterior body, can't see overlay film for before the short circuit, wherein confirm as short circuited test sample and be designated as the short circuit number with multi-meter.

(2) insulativity

Each test sample forms the exterior body of an end opening state, injects battery acid from this peristome, confirms insulativity by the resistance value of locating with the barrier layere (making barrier layere reveal exterior body outside contact electrode) of exterior body in this battery acid.Resistance value infinity (∞), the crack that causes for not existing root to split.

Content: 3g is by the formed battery acid 1MLiPF of mixed liquor of ethylene carbonate, diethyl carbonate, dimethyl carbonate (1: 1: 1) ₆

(3) affirmation of leakage and layering

The product that will seal were preserved 24 hours down at 80 ℃, confirmed the layering of content from the laminated body of the leakage of wire portion and content side.

(4) residual thickness of heat-sealing portion

On the cross section of heat-sealing portion, the thickness of establishing the preceding sealing layer (2 layers) of heat-sealing is 100, and the thickness of the sealing layer between barrier layere up and down after the heat-sealing is residual thickness (surplus ratio).

A as a result

Embodiment A

Embodiment A 1～embodiment A 4 does not all have short circuit at wire portion, does not have root to split and the leakage of content yet.In addition, there is not the layering of laminated body yet.Also have, the residual thickness of heat-sealing portion is as follows:

Embodiment A 1 50

Embodiment A 2 45

Embodiment A 3 60

Embodiment A 4 45

Comparative examples A

In Comparative examples A 1, though do not see short circuit, layering,, 0.1M Ω is arranged as insulativity, in cross-section photograph, also confirm and have the crack.Just do not see layering.

In Comparative examples A 2, seen short circuit, and, 0.1M Ω has been arranged as insulativity, in cross-section photograph, also confirm and have the crack.Just do not see layering.

In Comparative examples A 3, there is not short circuit, insulativity also is resistance value infinity (∞), does not see having the crack but having produced layering.Residual thickness is as follows in addition:

Comparative examples A 1 40

Comparative examples A 2 30

Comparative examples A 3 60

Effect A

From above result as can be known, sealing layer by making battery use packing material of the present invention is at least by the heat under heat-sealing with add to depress and be difficult for broken lazy flow polypropylene layer and breakable high-flowability polypropylene layer and constitute, and innermost layer is the high-flowability polypropylene layer, battery body is received in the bag of exterior body or the embossing forming section seals its periphery and when sealing, crosslinked sealing layer is owing to have the function of insulating barrier, therefore do not worry contact (short circuit) of the barrier layere of exterior body and lead, and near heat-sealing portion, do not have root to split generation, form stable battery use packing material.In addition, by sealing layer is bonding with doing laminating,, therefore can make the exterior body of the layering that can prevent aluminium and content side layer owing to can prevent the electrolyte of battery and the hydrogen fluoride corrosion aluminium face that reaction of moisture is produced.

B. second kind of form of the present invention

Battery use packing material based on second kind of form of the present invention further specifies by embodiment.

Common conditions B

The common conditions of Embodiment B and comparative example B is as follows:

(1) exterior body

In following Embodiment B and comparative example B,, be of a size of wide 30mm, long 50mm (being the inner face size) as bag type exterior body.In addition, during for the pattern pressing type exterior body, being the single-side embossing type, is the shape of 30mm * 50mm, dark 3.5mm with recess (die cavity) drawing of shaping die, estimates formability then.

(2) gross thickness of sealing layer

All be 30 μ m.

(3) chemical conversion is handled

When the barrier layere of exterior body was implemented the chemical conversion processing, Embodiment B and comparative example B were conditioning fluid with the aqueous system that is made of phenolic resin, charomic fluoride (3) cmpd, phosphoric acid all, with the coating of roll coated method, and at the overlay film sintering temperature more than 180 ℃.The coating amount of chromium is 2mg/m ²(dry weight).

(4) lead and lead film

The lead of Embodiment B and comparative example B is thick 100 μ m, wide 6mm, long 25mm.All is after sour modified polypropene film with 30 μ m is wound on the assigned position of lead as lead with film, and battery body is inserted separately exterior body.

(5) heat seal condition

The condition of heat-sealing is 190 ℃, 1MPa, 3sec.

Embodiment B 1

Implementing chemical conversion on the two sides of the aluminium of 20 μ m handles, on the face that chemical conversion was handled, use the polyester film (thick 12 μ m) of doing the bonding stretching of laminating, then, another face of the aluminium that the heating chemical conversion was handled, reach more than the softening point that becomes the sour modified polypropene of adhering resin layer (hereinafter referred to as PPa) up to temperature, extruding Ppa with the bonding multilayer film that becomes sealing layer of interlayer laminating, adopts resulting thus laminated body to form pillow pouch as exterior body.

Sealing layer is lazy flow PP＜6 〉/High Flowability PP (inner face side)＜42 layers, each PP is as follows.＜the bed thickness ratio of interior numeric representation co-extrusion pressure multilayer, following Embodiment B, comparative example B are too.

Lazy flow PP, MI 0.5/10min, 160 ℃ of fusing points

High Flowability PP, MI 30g/10min, 160 ℃ of fusing points

Battery body is inserted in the above-mentioned exterior body, makes test sample Embodiment B 1 by the heat-sealing sealing.

Embodiment B 2

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the face that chemical conversion was handled, use the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, the emulsion of spreading acid modified polypropene and dry on another face of the aluminium that chemical conversion was handled, and behind 180 ℃ sintering temperature, on the face of this sinter layer, use lamination methods adhesive seal layer.Form pallet with resulting laminated body by the embossing shaping.With deformed laminated body is that lid obtains the pattern pressing type exterior body.

Lazy flow PP, MI 3g/10min, 147 ℃ of fusing points

High Flowability PP, MI 7g/10min, 147 ℃ of fusing points

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample Embodiment B 2.

Embodiment B 3

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the face that chemical conversion was handled, use the polyester film (thick 25 μ m) of doing the bonding stretching of laminating, then, on another face of the aluminium that chemical conversion was handled, with sour modified polypropene is adhering resin, with interlayer laminating adhesive seal layer.After the laminated body that is obtained being heated to more than the temperature of sour modified polypropene softening point, this laminated body is shaped by embossing forms pallet.With deformed laminated body is that lid obtains the pattern pressing type exterior body.

High Flowability PP 1., MI 10g/10min, 147 ℃ of fusing points

Lazy flow PP, MI 1g/10min, 160 ℃ of fusing points

High Flowability PP 2., MI 10g/10min, 147 ℃ of fusing points

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample Embodiment B 3.

Embodiment B 4

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the face that chemical conversion was handled, use the polyester film (thick 25 μ m) of doing the bonding stretching of laminating, then, on another face of the aluminium that chemical conversion was handled, with sour modified polypropene is adhering resin, with co-extrusion pressure laminating adhesive seal layer.After being heated to the laminated body that is obtained more than the sour modified polypropene softening point temperature, this laminated body is formed pallet by the embossing shaping.With deformed laminated body is that lid obtains the pattern pressing type exterior body.

High Flowability PP 1., MI 20g/10min, 160 ℃ of fusing points

Lazy flow PP, MI 3g/10min, 160 ℃ of fusing points

High Flowability PP 2., MI 8g/10min, 147 ℃ of fusing points

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample Embodiment B 4.

Comparative example B1

Lazy flow PP, MI 3g/10min, 147 ℃ of fusing points

High Flowability PP, MI 7g/10min, 147 ℃ of fusing points

Battery body is inserted in the above-mentioned exterior body, makes test sample comparative example B1 by the heat-sealing sealing.

Comparative example B2

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the face that chemical conversion was handled, use the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, on another face of the aluminium that chemical conversion was handled, with sour modified polypropene is adhering resin, with interlayer laminating adhesive seal layer.After being heated to the laminated body that is obtained more than the sour modified polypropene softening point temperature, this laminated body is formed pallet by the embossing shaping.With deformed laminated body is that lid obtains the pattern pressing type exterior body.

Sealing layer is the High Flowability PP individual layer.

High Flowability PP, MI 20g/10min, 160 ℃ of fusing points

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample comparative example B2.

Comparative example B3

Not implementing chemical conversion on the two sides of the aluminium of 40 μ m and handle, with the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, on another face of aluminium, is adhering resin with sour modified polypropene on an aluminium face, with co-extrusion pressure laminating adhesive seal layer.After resulting laminated body was heated to temperature more than the polyacrylic softening point, this laminated body is shaped by embossing formed pallet.With deformed laminated body is that lid obtains the pattern pressing type exterior body.

Sealing layer can be the High Flowability PP individual layer, also can be High Flowability PP 1.＜1 〉/lazy flow PP＜8/High Flowability PP (inner face side) 2.＜13 layers, each PP is as follows.

High Flowability PP 1., MI 10g/10min, 147 ℃ of fusing points

Lazy flow PP, MI 1g/10min, 160 ℃ of fusing points

High Flowability PP 2., MI 10g/10min, 147 ℃ of fusing points

With the battery body mounting in the pallet of above-mentioned exterior body, lining lid, the periphery of heat-sealing pallet and seal and make test sample comparative example B3.

Evaluation method B

(1) lead and the exterior body barrier layere is short circuited has or not

(2) insulativity

(3) affirmation of leakage and layering

(4) residual thickness of heat-sealing portion

B as a result

Embodiment B 1～Embodiment B 4 does not all have short circuit at wire portion, does not have root to split and the leakage of content yet.In addition, there is not the layering of laminated body yet.Also have, the residual thickness of heat-sealing portion is as follows:

Embodiment B 1 52

Embodiment B 2 45

Embodiment B 3 60

Embodiment B 4 45

In comparative example B1, though do not see short circuit, layering,, 0.1M Ω is arranged as insulativity, in cross-section photograph, also confirm and have the crack.In comparative example B2, seen short circuit and, 0.1M Ω has been arranged as insulativity, in cross-section photograph, also confirm and have the crack.Just do not see layering.In comparative example B3, there is not short circuit, insulativity also is resistance value infinity (∞), does not see having the crack but having produced layering.Residual thickness is as follows:

Comparative example B1 40

Comparative example B2 30

Comparative example B3 60

Effect B

From above result as can be known, based on the battery use packing material of second kind of form of the present invention, insert battery body, the packing that form leak free battery exterior body by the heat-sealing circumference are at least by substrate layer, adhesive linkage, barrier layere, the adhering resin layer, the laminated body that sealing layer constituted, at least sealing layer is depressed by the heat and adding under heat-sealing and is difficult for broken lazy flow polypropylene layer and breakable high-flowability polypropylene layer and constitutes, and innermost layer is the high-flowability polypropylene layer, with battery body be received into exterior body the bag in or the embossing forming section, seal its periphery and when sealing, because the lazy flow polypropylene layer has the function of insulating barrier, therefore do not worry contact (short circuit) of the barrier layere of exterior body and lead, and be formed near the battery use packing material that does not have root to split the heat-sealing portion.

In addition, by have the interlayer laminating of adhering resin layer or co-extrusion pressure laminating to form sealing layer with being situated between, can prevent to form the back heating because of heating when laminated body forms or in laminated body, therefore the hydrogen fluoride corrosion aluminium face that the electrolyte of battery and reaction of moisture are produced can make the exterior body that can prevent aluminium and the layering of content side layer.

C. the third form of the present invention

Battery use packing material based on the third form of the present invention further specifies by embodiment.

Common conditions C

(1) formation of battery use packing material

The bag type of Embodiment C and comparative example C, the basic comprising of pattern pressing type are following formation, and the composition of adhering resin layer, laminating method etc. all are documented in the variant condition of Embodiment C, comparative example C.

The bag type

PET12/DL3/ALM20/ chemical conversion processing/adhering resin layer 15/ sealing layer 30

Pattern pressing type

ON25 μ m/DL3 μ m/ chemical conversion processing/ALM40 μ m/ chemical conversion processing/adhering resin layer 15 μ m/ sealing layer: 30 μ m

(polyester film that abbreviation PET:2 axle stretches, the nylon membrane that the ON:2 axle stretches, ALM: aluminium, DL: dried lamination, ALM: aluminium)

The acid modified polypropene is the unsaturated carboxylic acid graft atactic propene, and sealing layer is film or the extruded layer for being made of the random polypropylene resin all.Illustrate among Embodiment C and the comparative example C be hybrid resin with the adhering resin time blending ratio be part by weight.

(2) chemical conversion is handled

When on the barrier layere of exterior body, implementing the chemical conversion processing, Embodiment C and comparative example C are conditioning fluid with the aqueous system that is made of phenolic resin, charomic fluoride (3) cmpd, phosphoric acid all, with the coating of roll coated method, and at the overlay film sintering temperature more than 180 ℃.The coating amount of chromium is 1mg/m ²(dry weight).

(3) kind of exterior body

During the bag type, with pillow type bag with wide 30mm, long 50mm (being the inner face size) is evaluation object, during pattern pressing type, is the single-side embossing type, with recess (die cavity) drawing of shaping die is the shape of 30mm * 50mm, dark 3.5mm, estimates its formability then.Also have, in the example of pattern pressing type, all adopt the unshaped of the laminated body of embossing partly to do lid.

(4) heat seal condition

190℃、1.0Mpa、3sec。

Embodiment C 1

Implementing chemical conversion in the one side of the aluminium of 20 μ m handles, on the face of not implementing the chemical conversion processing, use the polyester film (thick 12 μ m) of doing the bonding stretching of laminating, then, the aluminium face that chemical conversion was handled is heated to more than the softening point temperature as the polypropylene-based resin of adhering resin with far-infrared rays and hot blast, and under this state, push the adhering resin of 15 μ m described later, the polypropylene screen that has become 30 μ m of sealing layer with interlayer laminating lamination is made laminated body.

Adhering resin is the hybrid resin of 40 parts of the sour modified polypropenes that divide of 60 parts of polypropylene dividing of MI26g/10 and MI1.0g/10, and the MI of hybrid resin is the 5g/10 branch.Form bag type exterior body with resulting laminated body.

Embodiment C 2

Implementing chemical conversion in the one side of the aluminium of 20 μ m handles, on the face of not implementing the chemical conversion processing, use the polyester film (thick 12 μ m) of doing the bonding stretching of laminating, then, on the aluminium face that chemical conversion was handled, become the acrylic resin (30 μ m) of adhering resin described later (15 μ m) and sealing layer with co-extrusion pressure laminating lamination after, resulting laminated body is heated to more than the temperature of softening point of adhering resin.

Adhering resin is mixed for 10 parts by 90 parts of the sour modified polypropenes of high MI and low density polyethylene (LDPE), is the 18g/10 branch as the MI of adhering resin.

Form bag type exterior body with resulting laminated body.

Embodiment C 3

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the one side that chemical conversion was handled, use the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, the another side of the aluminium that chemical conversion was handled is heated to more than the softening point temperature as the polypropylene-based resin of adhering resin with far-infrared rays and hot blast, and under this state, push the adhering resin of 15 μ m described later, the polypropylene screen that has become 30 μ m of sealing layer with interlayer laminating lamination is made laminated body.

Adhering resin is the hybrid resin of 26 parts of the sour modified polypropenes that divide of 74 parts of polypropylene dividing of MI26g/10 and MI1.0g/10, and the MI of hybrid resin is the 5g/10 branch.

Form pallet with resulting laminated body by the embossing shaping.With deformed laminated body is that cover material obtains the pattern pressing type exterior body.

Embodiment C 4

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the one side that chemical conversion was handled, use the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, on the another side of the aluminium that chemical conversion was handled, push the adhering resin of 15 μ m described later, behind the polypropylene screen of interlayer laminating lamination, resulting laminated body is heated to more than the temperature of softening point of adhering resin as 30 μ m of sealing layer.

Adhering resin is mixed for 10 parts by 80 parts of sour modified polypropenes, LDPE10 part, 10 parts of butadidenne, butadidenne, and the MI of adhering resin is the 9g/10 branch.

Embodiment C 5

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the one side that chemical conversion was handled, use the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, the another side that chemical conversion was handled is heated to more than the softening point temperature as the polypropylene-based resin of adhering resin with far-infrared rays and hot blast, and under this state, the adhering resin of 15 μ m described later and the acrylic resin that become 30 μ m of sealing layer are carried out the co-extrusion pressure lamination.

Adhering resin is mixed for 5 parts by the copolymer of 80 parts of sour modified polypropenes, LDPE10 part, 5 parts of butadidenne, ethene and propylene, and the MI of hybrid resin is the 12g/10 branch.Resulting laminated body embossing is configured as pallet, is that cover material obtains exterior body with deformed laminated body.

Comparative example C1

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the one side of implementing the chemical conversion processing, use the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, the another side of the aluminium that chemical conversion was handled is heated to more than the softening point temperature as the polypropylene-based resin of adhering resin with far-infrared rays and hot blast, and under this state, push the adhering resin of 15 μ m described later, the interlayer lamination has become the polypropylene screen of 30 μ m of sealing layer.

Adhering resin is the sour modified polypropene that MI0.1g/10 divides.

Resulting laminated body embossing is configured as pallet, is that cover material obtains exterior body with deformed laminated body.

Comparative example C2

Implementing chemical conversion on the two sides of the aluminium of 40 μ m handles, on the one side of implementing the chemical conversion processing, use the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, the adhering resin of extruding 15 μ m described later on the another side of the aluminium that chemical conversion was handled, behind the polypropylene screen of interlayer lamination as 30 μ m of sealing layer, be heated more than the softening point temperature of adhering resin.

Adhering resin is mixed by 90 parts of sour modified polypropenes and LDPE10 part, is 25 as the MI of adhering resin.

Forming pallet with resulting laminated body embossing shaping, is that cover material obtains exterior body with deformed laminated body.

Comparative example C3

On the one side of the aluminium of not implementing the 40 μ m that chemical conversion handles, with the nylon membrane (thick 25 μ m) of doing the bonding stretching of laminating, then, on the another side of aluminium, with resin described later is the adhering resin of 15 μ m, behind the polypropylene screen of interlayer lamination as 30 μ m of sealing layer, be heated more than the softening point temperature of adhering resin.

Adhering resin is mixed for 10 parts by 80 parts of sour modified polypropenes, LDPE10 part, butadidenne, is the 9g/10 branch as the MI of adhering resin.

Assessment item C

1) the mouth-sealed portion root splits

Battery body is received in the exterior body, after the pressurizing window, with microscopic examination mouth-sealed portion and with the cross section of the continuous non-mouth-sealed portion of mouth-sealed portion, confirm that at the adhering resin layer segment whether root taking place splits.

2) the thickness surplus ratio of hot melt coating (adhering resin layer and sealing layer)

Measure the thickness of the hot melt coating after sealing, calculate ratio with respect to the gross thickness of the hot melt coating before the heat-sealing.

3) layering

Fill the mixed liquor formed battery acid 1MLiPF of 3g by ethylene carbonate, diethyl carbonate, dimethyl carbonate (1: 1: 1) ₆, after keeping 7 days under 85 ℃ the temperature, the layering of Visual Confirmation ALM and adhering resin interlayer.

C as a result

Embodiment C

In Embodiment C 1～C5, there is not the root of mouth-sealed portion to split, there is not the layering (test sample each 100) of ALM and adhering resin interlayer yet

In addition, the thickness surplus ratio of hot melt coating is as follows:

Embodiment C 1 60%

Embodiment C 2 32%

Embodiment C 3 70%

Embodiment C 4 60%

Embodiment C 5 55%

Comparative example C

Though do not have the root of mouth-sealed portion to split, do not have yet the layering (test sample each 100) of aluminium and adhering resin interlayer among the comparative example C1, in embossing is shaped, 25 cracks that produce ALM arranged in 100 test sample.

Comparative example C2, because heat-sealing, the attenuation of hot melt coating has 3 to produce root and split in 100 test sample.There is not the layering of ALM and adhering resin interlayer.

Comparative example C3 though there is not root to split, has 54 between ALM and adhering resin layer layering to take place in 100 test sample.In addition, the thickness surplus ratio of the hot melt coating among the comparative example C is as follows:

Comparative example C1 75%

Comparative example C2 22%

Comparative example C3 60%

Effect C

Because making the packing that insert battery body, form leak free battery exterior body by the heat-sealing circumference is the laminated body that is made of substrate layer, adhesive linkage, aluminium, chemical conversion processing layer, adhering resin layer, polyacrylic resin sealing layer at least, the adhering resin layer is the resin of fusion index in the scope that 5～20g/10 divides, and the energy actv. prevents the short circuit between barrier layere and lead.And can prevent that generation is detained resin and is split at the end of this delay resin generation root near the inner edge of mouth-sealed portion.

D. the 4th kind of form of the present invention

Battery use packing material based on the 4th kind of form of the present invention further specifies with embodiment.

Common conditions D

Common conditions is as follows in embodiment D and the Comparative Example D.

(1) exterior body

Be pattern pressing type, nylon 25 μ m/ adhesive linkages (1)/chemical conversion processing layer/ALM40 μ m/ chemical conversion processing layer/adhesive linkage (the 2)/sealing layer 30 μ ms of structure for stretching.If the not special record of the manufacture method of the laminated body that embodiment is D, use in the Comparative Example D is by following lamination.

The chemical conversion processing layer of chromate gloss finish is set on the two sides of aluminium (thick 40 μ m), the nylon membrane (thick 25 μ m) that dried lamination stretches on the face therein forms adhesive linkage (1), form adhesive linkage (2) with diverse ways on another face, laminating seal layer (thick 30 μ m) is made laminated body.

In addition, embodiment D, Comparative Example D are the conditioning fluid of above-mentioned chromate gloss finish with the aqueous system that is made of phenolic resin, charomic fluoride (3) cmpd, phosphoric acid all, with the coating of roll coated method, and at the overlay film sintering temperature more than 180 ℃.The coating amount of chromium is 2mg/m ²(dry weight).

Then, the laminated body embossing shaping that is obtained is formed pallet.With deformed laminated body is that lid obtains exterior body.

(2) type of exterior body

Be the single-side embossing type, the embossing shaping die of above-mentioned pallet, its recess (die cavity) be shaped as 30mm * 50mm, the shaping degree of depth is adjusted with the scale of 0.5mm by the amount of being pressed into of protuberance.

(3) be called for short

The abbreviation of using in the following description is as follows:

Main resin

ON: the nylon membrane of stretching

ALM: aluminium foil

LL: density is 0.925 general wire low density polyethylene (LDPE)

MLL1: density is 0.92 class of metallocenes LLDPE

MLL2: density is 0.90 class of metallocenes LLDPE

MD: density is 0.93 medium density polyethylene

LD: density is 0.90 low density polyethylene (LDPE)

PEa: sour modified poly ethylene

PEaH: sour modified poly ethylene emulsion

Embodiment D1

On the two sides of ALM (thick 40 μ m), implement chemical conversion and handle, dried lamination ON on a face (thick 25 μ m), dried lamination is made the laminated body of embodiment D1 as the film of sealing layer on another chemical conversion treated side of ALM.

Film as sealing layer is that laminate side is that LL (thick 25 μ m) and inner face side are 2 layers of structure of MLL1 (thick 5 μ m).

Embodiment D2

On the two sides of ALM (thick 40 μ m), implement chemical conversion and handle, dried lamination ON on a face (thick 25 μ m), dried lamination is made the laminated body of embodiment D2 as the film of sealing layer on another chemical conversion treated side of ALM.

Film as sealing layer is the individual layer of MLL1 (thick 30 μ m).

Embodiment D3

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), extruding is as the PEa of 15 μ m of adhering resin on another chemical conversion treated side of ALM, the sealing tunic of interlayer lamination 30 μ m, resulting laminated body is heated to more than the softening point temperature of PEa, makes the laminated body of embodiment D3.

Embodiment D4

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), another chemical conversion treated side of ALM is heated to more than the softening point temperature of PEa, extruding is as the PEa of 15 μ m of adhering resin, the sealing tunic of interlayer lamination 30 μ m is made the laminated body of embodiment D4.

As the film of sealing layer is that laminate side is that MD (thick 10 μ m) and inner face side are that (mixture ratio is a weight ratio, MLL2: MD=9: 2 layers of structure 1) for the hybrid resin (thick 20 μ m) of MLL2 and MD.

Embodiment D5

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), another chemical conversion treated side of ALM is heated to more than the softening point temperature of PEa, extruding is as the PEa of 15 μ m of adhering resin, the sealing tunic of interlayer lamination 30 μ m is made the laminated body of embodiment D5.

Film as sealing layer is the individual layer of MLL1 (thick 30 μ m).

Embodiment D6

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), the co-extrusion pressure lamination is as the PEa (15 μ m) and the sealing tunic (30 μ m) of adhering resin on another chemical conversion treated side of ALM, resulting laminated body is heated to more than the softening point temperature of PEa, makes the laminated body of embodiment D6.

The sealing layer resin is that (mixture ratio is a weight ratio, MLL1: LD=7: 3) for the hybrid resin of MLL1 and LD

Embodiment D7

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), the PEa of extruding adhering resin on another chemical conversion treated side of ALM, follow crush seal layer resin (30 μ m), resulting laminated body is heated to more than the softening point temperature of PEa, makes the laminated body of embodiment D7.

Embodiment D8

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), behind the PEa of extruding adhering resin on another chemical conversion treated side of ALM, resulting intermediate laminate body is heated to more than the softening point temperature of PEa, crush seal layer resin (30 μ m) made the laminated body of embodiment D8.

The sealing layer resin is that (mixture ratio is a weight ratio, MLL1: LL=8: 2) for the hybrid resin of MLL1 and LL

Embodiment D9

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), on another chemical conversion treated side of ALM, apply dry PEa with the roll coated method, and heat-agglomerating, heat lamination is made the laminated body of embodiment D9 as the film of sealing layer on this sinter layer.

Film as sealing layer is MLL1 (thick 30 μ m).

Comparative Example D 1

On the two sides of ALM (thick 40 μ m), implement chemical conversion and handle, dried lamination ON on a face (thick 25 μ m), dried lamination is made the laminated body of Comparative Example D 1 as the film of sealing layer on another chemical conversion treated side of ALM.

Film as sealing layer is the individual layer of LL (thick 30 μ m).

Comparative Example D 2

On the two sides of ALM (thick 40 μ m), do not implement chemical conversion and handle, dried lamination ON on a face (thick 25 μ m), dried lamination is made the laminated body of Comparative Example D 2 as the film of sealing layer on another face of ALM.

Film as sealing layer is the individual layer of MLL1 (thick 30 μ m).

Comparative Example D 3

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), extruding is as the PEa of 15 μ m of adhering resin on another chemical conversion treated side of ALM, the sealing tunic of interlayer lamination 30 μ m, resulting laminated body is heated to more than the softening point temperature of PEa, makes the laminated body of Comparative Example D 3.

Film as sealing layer is LL (thick 30 μ m).

Comparative Example D 4

Not implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), extruding is as the thick PEa of 15 μ m of adhering resin on another face of ALM, the sealing tunic of interlayer lamination 30 μ m, the laminated body that is obtained is heated to more than the softening point temperature of PEa, makes the laminated body of Comparative Example D 4.

Comparative Example D 5

Implementing chemical conversion on the two sides of ALM (thick 40 μ m) handles, dried lamination ON on a face (thick 25 μ m), on another chemical conversion treated side of ALM, apply dry PEa with the roll coated method, and heat-agglomerating, heat lamination is made the laminated body of Comparative Example D 5 as the film of sealing layer on this sinter layer.

Film as sealing layer is LL (thick 30 μ m).

Evaluation method D

(1) affirmation of layering

In with the formed exterior body of different laminated body behind the filling electrolyte, preserved 24 hours down at 60 ℃ by the laminated body of doing the laminating acquisition, the laminated body that extruded layer platen press by adhering resin obtains was preserved 24 hours down at 85 ℃, the having or not of aluminium (chemical conversion processing layer) when confirming to preserve respectively and adhesive linkage layering.

Battery acid: 3g is by the formed battery acid 1MLiPF of mixed liquor of ethylene carbonate, diethyl carbonate, dimethyl carbonate (volume ratio 1: 1: 1) ₆

(2) formability

Embodiment D and Comparative Example D all are shaped 50, and record can obtain the shaping amount of being pressed into (mm) of the stable pallet that pin hole, fold, emulsification do not take place.

(3) sealing-strength

After 190 ℃, 1MPa, 3.0 seconds condition lower seal seal, measure the peel strength of mouth-sealed portion.Unit: N/15mm.

D as a result

Embodiment D

Layering does not all take place in embodiment D1～D9, does not have generations such as pin hole, fold yet, and formability is good.Sealing of heat-sealing portion also presents stable intensity.In addition, formability, the sealing-strength among the embodiment D is as follows.

Shaping degree of depth sealing-strength

Embodiment D1 5.0 12

Embodiment D2 5.5 12

Embodiment D3 4.5 13

Embodiment D4 4.0 11

Embodiment D5 5.0 13

Embodiment D6 4.5 11

Embodiment D7 4.5 11

Embodiment D8 5.0 12

Embodiment D9 5.0 12

Comparative Example D

In the Comparative Example D 1, layering does not take place, formability is also good, but sealing-strength is low.

Among embodiment D2 and the embodiment D4, formability, sealing-strength are all out of question, but layering has taken place.

Among embodiment D3 and the embodiment D5, layering does not take place, formability is also good, but sealing-strength is low.

In addition, the formability in the Comparative Example D, sealing-strength are as follows.

Shaping degree of depth sealing-strength

Comparative Example D 1 4.5 9

Comparative Example D 2 5.5 12

Comparative Example D 3 4.0 9

Comparative Example D 4 4.5 13

Comparative Example D 5 5.0 8

Effect D

In the battery use packing material, be class of metallocenes LLDPE resin or for having mixed the resin of class of metallocenes LLDPE, compare that the formability in the shaping improves, and can prevent to produce fold, pin hole with general LLDPE by making sealing layer at least or its innermost layer.And, compare with general LLDPE on the sealing-strength, can obtain big sealing-strength.In addition, handle by implementing chemical conversion on the two sides of the aluminium of exterior body, in the time of can preventing that embossing is shaped, and between substrate layer and aluminium, produce layering during heat-sealing, can also prevent when forming sealing layer with dried laminating, lamination methods, interlayer laminating or co-extrusion pressure laminating, because the heating after heating when laminated body forms or laminated body form, the hydrogen fluoride corrosion aluminium face that the electrolyte of battery and reaction of moisture produce, and prevent layering between the layer of aluminium and content side thus.

Claims

1. a battery use packing material is characterized in that, the packing that insert battery body, form leak free battery exterior body by the heat-sealing circumference are at least by substrate layer, adhesive linkage 1, barrier layere, adhesive linkage 2, laminated body that sealing layer constituted,

Sealing layer is formed by the resin bed lamination of the wire low density polyethylene (LDPE) that contains class of metallocenes more than one deck at least.

2. according to the battery use packing material of being put down in writing in the claim 1, it is characterized in that sealing layer is formed by class of metallocenes wire ldpe resin.

3. according to the battery use packing material of being put down in writing in the claim 1, it is characterized in that sealing layer is formed by the polythylene resin that contains the class of metallocenes wire ldpe resin more than 10%.

4. according to the battery use packing material of being put down in writing in the claim 1, it is characterized in that sealing layer is made of multilayer, wherein contain the layer that constitutes by class of metallocenes wire ldpe resin at least.

5. according to the battery use packing material of being put down in writing in the claim 1, it is characterized in that sealing layer is made of the multilayer that contains the polythylene resin layer, wherein, the polythylene resin layer contains the class of metallocenes wire low density polyethylene (LDPE) more than 10%.

6. according to the battery use packing material of being put down in writing in any one of the claim 1～5, it is characterized in that adhesive linkage 2 is formed by dried laminating.

7. according to the battery use packing material of being put down in writing in any one of the claim 1～5, it is characterized in that adhesive linkage 2 is coating sintering layers of acid modified polyolefin.

8. according to the battery use packing material of being put down in writing in any one of the claim 1～5, it is characterized in that adhesive linkage 2 is extruded layers of acid modified polyolefin.