JP2012104503A - Electric component, nonaqueous electrolyte battery, and lead conductor with insulation coating layer and encapsulation container used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric component, especially a nonaqueous electrolyte battery, having an encapsulation container including a metal layer and a lead conductor extending from the inside to the outside of the encapsulation container, where the lead conductor and the encapsulation container are heat-sealed at the seal portion with excellent adhesive strength and sealability, and short circuit does not occur between the metal layer and the lead conductor during heat-seal, and to provide a lead conductor with an insulation coating layer and an encapsulation container for use in the electric component, or the like.SOLUTION: The electric component has an encapsulation container including a metal layer, and a lead conductor extending from the inside to the outside of the encapsulation container where the lead conductor and the encapsulation container are sealed at the seal portion with a heat-seal layer interposed therebetween, and a slightly softening layer having a through hole in the thickness direction is provided between the metal layer at the seal portion and the lead conductor. A nonaqueous electrolyte battery having a nonaqueous electrolyte and an electrode encapsulated in the encapsulation container, and a lead conductor with an insulation coating layer and an encapsulation container for use in the electric component are also provided.

Description

  The present invention relates to an electrical component used in an electronic device or the like, particularly a non-aqueous electrolyte battery used as a power source or the like for a small electronic device, and further relates to a lead conductor with insulation coating that is a member constituting the electrical component, and a sealed container. .

  In order to reduce the size and weight of electronic devices, the electrical components used there are also required to be smaller and lighter. For this reason, for example, as a power source, a nonaqueous electrolyte battery in which a bag body is used as an enclosure and a nonaqueous electrolyte, a positive electrode, and a negative electrode are enclosed therein is being adopted.

  This sealed container is required to have a property of preventing permeation of electrolyte and gas and intrusion of moisture from the outside. Therefore, a laminate film having a multilayer structure of resin film / metal layer / heat-fusible resin (heat-fusible layer) is used as the material of the enclosure.

  The nonaqueous electrolyte battery encloses a separator between the nonaqueous electrolyte, the positive electrode plate, the negative electrode plate, and the positive and negative electrode plates in this enclosure, and further encloses a lead conductor having one end connected to the positive electrode plate and the negative electrode plate. It can be manufactured by being arranged so as to extend from the opening of the container to the outside of the battery and finally heat-sealing the opening. (Hereinafter, this heat-sealed opening is referred to as a seal portion.)

  At the time of fusion of the seal portion, the heat fusion layer of the laminate film is thermally fused, and the lead conductor and the laminate film are also thermally fused via the heat fusion layer. Therefore, the seal part is required to have excellent adhesiveness and sealability by heat sealing, but also has a property that does not cause a short circuit between the metal layer of the laminate film and the lead conductor due to deformation during heat sealing. It is done.

  For this reason, various contrivances have been made for the inner layer of the laminate film (the layer between the metal layer and the lead conductor in the seal portion) and the insulating coating layer of the lead conductor in the seal portion. For example, in Patent Document 1, a layer of maleic acid-modified polyolefin having good adhesion to the lead conductor is provided as an insulating coating layer of the lead conductor, and the gel fraction is 20 to 20 outside thereof. An invention is disclosed that provides a layer of crosslinked polyethylene that is 90%. However, since the adhesiveness varies depending on the degree of crosslinking of the crosslinked polyethylene, in the present invention, it is necessary to accurately control the degree of crosslinking in order to ensure the adhesiveness, and the productivity decreases due to this control. There's a problem.

  An invention has also been disclosed in which acid-modified linear low-density polyethylene is interposed between the lead conductor and the enclosing container to enable heat fusion at a low temperature and to improve the sealing performance (Patent Document 2). However, in this invention, at the time of thermal fusion, softening of the intervening film and short-circuit due to flow are likely to occur, and there is a problem that it is quite difficult to control the fusion by pressurizing and heating while avoiding it. .

In addition, a laminate of a high-fluidity polypropylene layer that is easily deformed by heat and pressure by heat sealing and a low-fluidity polypropylene layer that is difficult to deform is interposed between the lead conductor and the enclosing container, and the metal of the laminate film An invention for preventing a short circuit between a layer and a lead conductor is also disclosed (Patent Document 3). However, in the present invention, short circuiting is likely to occur in heat fusion under a temperature condition exceeding the melting point of the low-flowing resin, and it is quite difficult to achieve excellent adhesion under conditions avoiding this.
Japanese Patent No. 31141174 Japanese Patent Laid-Open No. 2001-277736 Japanese Patent Laid-Open No. 2003-7269

  An object of the present invention is to solve the above-described problems of the prior art. Specifically, the lead conductor includes a sealed container including a metal layer and a lead conductor extending from the inside of the sealed container to the outside. And the sealed container are heat-sealed at the seal portion with excellent adhesive strength and sealability, and an electrical component that does not cause a short circuit between the metal layer and the lead conductor during heat-sealing, particularly non- It is an object to provide a water electrolyte battery. It is another object of the present invention to provide a lead conductor with an insulating coating layer and an enclosing container used for the electrical component.

  As a result of the study, the present inventor has found that the heat fusion layer is formed between the metal layer of the seal portion and the lead conductor, that is, on the insulating coating layer of the lead conductor or the metal layer of the enclosing container at a position corresponding to the seal portion. In addition, by providing a layer having a relatively high softening temperature and having a through-hole in the thickness direction, it has been found that excellent sealing properties can be obtained and a short circuit problem can be prevented. completed.

  The present invention has a sealed container including a metal layer and a lead conductor extending from the inside of the sealed container to the outside, and the lead conductor and the sealed container are fused at a seal portion via a heat-sealing layer. Provided is an electrical component, characterized in that a non-softening layer having a through hole in the thickness direction is provided between a metal layer of a seal portion and a lead conductor.

  Examples of the enclosing container including the metal layer include a bag made of a laminate film including the metal layer. For example, a bag made of a laminate film having a multilayer structure of resin film / metal layer / heat-sealable resin film (heat-seal layer) as described above can be used. A sealed container can be manufactured by stacking two sheets and leaving the opening part and heat-sealing the side part.

  Here, the heat-seal layer is made of a heat-sealable resin that melts and heat-seal by heating, and heat-seals between the laminate films and between the laminate films and the lead conductors. As the metal layer, a foil made of aluminum or aluminum alloy is preferably exemplified.

  The lead conductor is made of metal and is disposed so as to extend from the inside of the enclosure to the outside. Examples of the cross-sectional shape include a round electric wire and a flat rectangular electric wire, but the cross-sectional shape is not particularly limited. Examples of the metal include aluminum, nickel, copper, nickel-plated copper, and the like.

  A part of the lead conductor may be covered with an insulating layer, and in particular, it is heat-sealed to the outer layer of the part corresponding to the seal part (the part located in the seal part when the enclosure is sealed). By providing the insulating layer having a layer, excellent adhesive force and sealing property with the laminate film of the sealed container can be obtained.

  In the electrical component of the present invention, the lead conductor and the enclosing container are fused by a seal portion via a heat sealing layer. The heat-seal layer is a heat-seal layer that forms the laminate film, a heat-seal layer that is an outer layer of the insulating layer that is formed in the portion corresponding to the seal portion of the lead conductor as described above, etc. It is.

  The heat-sealing layer is formed from a resin having a low softening temperature in order to obtain excellent adhesion and sealability at a low heat-sealing temperature. Examples of the resin having a low softening temperature include polyethylene, polypropylene, ionomer resin, and acid-modified polyolefin. Among these, acid-modified polyolefin is preferable because it has a polar group and is excellent in adhesion and sealability. The acid-modified polyolefin is a polyolefin modified by grafting an acid such as maleic anhydride. Examples of the polyolefin relating to the acid-modified polyolefin resin include polyethylene and polypropylene.

  The electrical component of the present invention is characterized by having a softening-resistant layer having a through hole in the thickness direction between the metal layer of the seal portion and the lead conductor. The hardly softened layer is a layer made of a material having a high softening temperature so as not to be deformed during heat fusion. The softening temperature of the material of the difficult-to-soften layer is desired to be sufficiently higher than the heat fusion temperature. As a result, the hard-softening layer does not deform at the time of heat fusion, so that a short circuit between the metal layer of the enclosure and the lead conductor is prevented.

  Thus, the softening temperature of the hard-to-soften layer is desirably a temperature that sufficiently exceeds the heat fusion temperature. Further, the softening temperature of the heat-sealing layer is preferably a temperature sufficiently lower than the heat-fusion fusing temperature, and is preferably 70 to 150 ° C., but in view of workability of heat fusing, the difference between the two softening temperatures. Is preferably 20 ° C. or higher, more preferably 40 ° C. or higher.

  Examples of the material having a high softening temperature for forming the hardly softened layer include resins such as polyester, polyethylene, polypropylene, polyarylate, fluororesin, and PPS. Of these, polyester, polypropylene, polyarylate, and fluororesin are preferable. Not only resin but glass fiber may be used. Moreover, the mixture of 2 or more types of materials may be sufficient.

  The hardly softened layer has a through hole in its thickness direction. At the time of thermal fusion, the resin forming the thermal fusion layer is melted by heating and enters the inside of the through hole. As a result, peeling between the heat-fusible layer and the softening-resistant layer is less likely to occur, and the adhesiveness and sealing performance between the sealed container and the lead conductor are improved, which is preferable.

  The through-hole of the hardly softened layer can be obtained by forming a hole in the thickness direction with a drill or the like, for example. Moreover, as will be described later, a mesh formed by knitting resin fibers and a non-woven fabric formed of resin fibers can also be preferably used. The hole diameter of the through hole is preferably about 0.05 mm to 2 mm, and the hole area ratio is preferably about 10% to 70%. When the hole diameter is smaller than 0.05 mm, the heat-fusible layer is difficult to enter the hole and the filling property is deteriorated. If it is larger than 2 mm, the lead conductor and the metal layer are likely to be short-circuited.

  The electrical component of the present invention is heated by sandwiching the lead conductor between the laminate films in the sealing part of the enclosing container, and melting the heat-sealing layer in the insulating film or the like of the laminate film or the lead conductor. Can be obtained. Accordingly, the heating is performed at a temperature equal to or higher than the melting temperature of the resin of the heat sealing layer.

  The present invention also provides a sealed container including a metal layer, a lead conductor extending from the inside of the sealed container, a nonaqueous electrolyte sealed in the sealed container, and the lead sealed in the sealed container. A battery having an electrode connected to an end portion of a conductor, wherein the lead conductor and the enclosing container are fused at a seal portion via a heat-fusible layer, the metal layer of the seal portion and the lead Provided is a non-aqueous electrolyte battery characterized by having a non-softening layer having a through hole in the thickness direction between the conductor and a conductor.

  This non-aqueous electrolyte battery is an aspect of the invention of the electrical component, and the enclosure, the lead conductor, the heat-fusible layer, and the hardly softened layer including the metal layer are the same as described above. The nonaqueous electrolyte battery further includes an electrode connected to the end portion of the nonaqueous electrolyte and the lead conductor in the enclosure. Since the electrode has at least a positive electrode and a negative electrode, two or more lead conductors are provided, and one end of each electrode is connected to each electrode such as a positive electrode and a negative electrode. As the non-aqueous electrolyte, and the positive electrode and the negative electrode, those similar to those of conventionally known non-aqueous electrolyte batteries are used. Usually, further, a separator for separating the positive electrode and the negative electrode is provided.

  The present invention is further used for the electrical component or the nonaqueous electrolyte battery of the present invention, and the lead having an insulating coating layer having an insulating coating layer including a heat-fusible layer and a softening-resistant layer in a portion corresponding to the seal portion. Providing a conductor. That is, a lead conductor used in the electrical component or nonaqueous electrolyte battery and an insulating coating layer covering at least a portion corresponding to the seal portion, and the insulating coating layer is a heat fusion layer 1 covering the lead conductor. And a lead conductor with an insulating coating layer, characterized in that it has at least two layers of a softening-resistant layer that covers the thermal fusion layer 1 and has through-holes in the thickness direction.

  The heat-sealing layer 1 constituting the lead conductor with an insulating coating layer of the present invention has the same configuration and characteristics as the above-mentioned heat-sealing layer, and the lead conductor and the softening layer are also the above-mentioned leads. It has the same configuration and characteristics as the conductor and the softening layer. The heat-fusible layer 1 is provided in contact with the lead conductor, and a hardly softening layer is provided thereon. As a result, an excellent adhesive force between the lead conductor and the softening-resistant layer can be obtained.

  When the insulating coating layer is composed of only two layers, that is, the heat-fusible layer 1 and the hard-to-soften layer, at the time of heat-sealing, the hard-softening layer and the laminated film of the enclosing container come into contact with each other and both are heat-sealed. At the time of heat-sealing, the resin constituting the heat-sealing layer 1 may be melted by heating and enter into the through hole of the softening-resistant layer, and the resin may be heat-sealed with the laminate film. In this case, in order to make heat fusion more reliable, it is more preferable that the resin of the heat fusion layer is allowed to enter the inside of the through hole at the stage of manufacturing the lead conductor with an insulating coating layer.

  According to the present invention, as a more preferable aspect of the lead conductor with an insulating coating layer, the insulating coating layer further includes a heat-fusible layer 2 that covers the softening-resistant layer. A conductor is provided. Thus, it is more preferable to provide heat fusion on the laminate film side of the hard-softening layer, that is, the outermost periphery, because more excellent adhesiveness and sealing properties with the enclosing container are obtained. The heat sealing layer 2 has the same configuration and characteristics as the above heat sealing layer.

  The resin of the heat-fusible layer 1 and the resin of the heat-fusible layer 2 are melted by heating at the time of heat-sealing and enter into the through hole of the softening-resistant layer and come into contact with each other through the through hole. As a result, the peeling between the softening layer and the heat-fusible layer is suppressed. If the through hole of the softening layer is filled with the resin of the heat-sealing layer and the resin of both heat-sealing layers is in contact at the manufacturing stage of the lead conductor with an insulating coating layer, the contact between the two is more It is more preferable because it is certain.

  The lead conductor with an insulating coating layer of the present invention can be obtained by providing a coating layer on the lead conductor by a known method. For example, a heat-bonding layer can be formed by laminating a film-like resin. An insulating coating layer composed of three layers, ie, a heat-fusible layer / a hard-to-soften layer / a heat-fusible layer, can be obtained by a method of laminating a film composed of these three layers on a lead conductor.

  As the hardly softening layer, a mesh layer formed by knitting resin fibers or a non-woven fabric layer formed from resin fibers can also be used.

  For example, when the softening-resistant layer is a mesh layer, the warp may be polyester and the weft may be a fluororesin. However, it is often preferable to use only one type of resin from the viewpoint of the production cost of the mesh or the nonwoven fabric. Furthermore, in addition to the resin of the main material as described above, for example, several% of an adhesive may be blended for good fusion of each yarn.

  The present invention further includes an enclosing container including a metal layer used in the electric component or the nonaqueous electrolyte battery of the present invention, wherein a lead conductor is sandwiched at least part of the seal portion, that is, at the time of fusion. A sealed container having an insulating layer including a hard-softening layer and a heat-fusible layer at a position is provided. That is, an encapsulated container including a metal layer, which is used for the electrical component or the non-aqueous electrolyte battery, in which at least a fused portion with the lead conductor covers the metal layer, and the heat It is an enclosed container characterized in that it is covered with an insulating layer having a hard-softening layer that covers a fusion-bonding layer and has through-holes in the thickness direction. Preferably, the softening-resistant layer is further covered with a heat-fusible layer and sandwiched between two heat-fusible layers (hereinafter, each heat-fusible layer is referred to as a heat-fusible layer a and a heat-fusible layer. b).

  This enclosing container is provided with a heat-fusible layer and a softening-resistant layer (not on the lead conductor as in the above invention) on the metal layer of the laminate film constituting the enclosing container. Excellent adhesion and sealability are ensured by the adhesion layer, and short circuit between the metal layer and the lead conductor of the enclosing container at the time of heat fusion can be prevented by the softening layer.

  The fused portion with the lead conductor is a portion that sandwiches the lead conductor and fuses the enclosing container and the lead conductor, and is therefore the inner surface side (side that encloses the electrolyte solution or the like) of the enclosing container. The laminate film constituting the encapsulating container of the present invention has an insulating layer on the inner surface side of the metal layer, and at least the fused portion of the insulating layer with the lead conductor is the heat-fusible layer a and the softening layer (preferably Is further characterized by comprising a heat-sealing layer b). In order to facilitate the production of the enclosure, the entire inner surface of the metal layer may be covered with the insulating layer having the above configuration.

  The configuration, action, and function of the heat-fusible layer a and the heat-fusible layer b are the same as those of the heat-fusible layer, and the structure, action, and function of the hard-to-soften layer are also the same as those of the hard-to-soften layer Furthermore, the metal layer constituting this sealed container is the same as described above, and aluminum or aluminum alloy foil is preferably exemplified. Since the heat-fusible layer a is provided in contact with the metal layer, an excellent adhesive force between the metal layer and the hardly softened layer can be obtained.

  In the laminated film constituting the encapsulating container of the present invention, preferably, the heat-fusible layer b is also provided on the lead conductor side (the side opposite to the metal layer) of the hardly softened layer. The heat-fusible layer b is melted by heating, and excellent adhesion and sealing properties with the lead conductor are obtained.

  The resin of the heat-fusible layer a and the resin of the heat-fusible layer b are melted by heating at the time of heat-fusing and enter the through hole of the softening-resistant layer and come into contact with each other through the through-hole. As a result, peeling between the softening-resistant layer and each heat-fusible layer is suppressed. If the through-holes of the softening-resistant layer are filled with the resin of the heat-fusible layer at the manufacturing stage of the laminated film of the encapsulated container, and the resin of both the heat-fusible layers is in contact, the contact between the two is more reliable Is more preferable.

  An insulating layer usually formed of a resin or the like is also provided on the outer side of the metal layer of the enclosure of the present invention, that is, on the opposite side of the insulating layer. As this resin, polyamide or the like is used. Such a laminate film can be obtained by a known method. For example, it can be obtained by laminating a resin layer such as polyamide on a metal layer, and further laminating a film composed of three layers of a heat fusion layer / a softening layer / a heat fusion layer on the opposite side of the metal layer. .

  As the softening-resistant layer constituting the insulating layer of the enclosure, a mesh layer formed by knitting resin fibers or a nonwoven fabric layer formed from resin fibers can be used. The configurations of the mesh layer and the non-woven fabric layer are the same as the configurations of the mesh layer and the non-woven fabric layer constituting the insulation coating layer of the lead conductor. For example, the warp may be polyester and the weft may be a fluororesin. For example, several% of an adhesive may be blended for good fusion of each yarn.

  In the electrical component and non-aqueous electrolyte battery of the present invention, and when the electrical component and non-aqueous electrolyte battery are manufactured using the lead conductor and encapsulating container with the insulating coating layer of the present invention, the encapsulated container and the lead of the seal portion are used. Since there is a softening layer made of a resin with a softening temperature higher than the heat sealing temperature between the conductors, the short circuit between the metal layer of the encapsulated container and the lead conductor, which was likely to occur during heat sealing, is effectively suppressed. Is done. Furthermore, this softening layer has through-holes in its thickness direction, and as a result of the heat fusion layer resin entering into this during heat fusion, excellent adhesive force and sealing properties are obtained, No problems such as peeling occur.

  Hereinafter, the best mode of the present invention will be described based on examples. The present invention is not limited to the following embodiments, and various modifications can be made to the following embodiments within the same and equivalent scope as the present invention.

[Manufacture of lead conductor with insulation coating for evaluation test]
(Lead conductor production)
The lead conductor for the positive electrode is an aluminum plate having a thickness of 0.1 mm, a width of 5 mm, and a length of 100 mm. The lead conductor for the negative electrode is a copper plate having a thickness of 0.1 mm, a width of 5 mm, and a length of 100 mm.

(Production of insulation coating layer)
The following four types (a, b, c, d) were produced as insulating coating layers for lead conductors, and were coated on the lead conductors.

Insulating coating layer a:
Maleic anhydride-modified polyethylene with a thickness of 50 μm (Mitsui Chemicals, Inc .: Admer NE060, density 0.92 g / cc, melt flow rate 1.0, softening temperature 104 ° C .: heat-sealing layer 1), pore size in the thickness direction 25 mm thick polyester having a through hole with 1 mmφ and an aperture ratio of 28% (manufactured by Toray Industries, Inc .: Lumirror S10, softening temperature 253 ° C .: hardly softened layer), and 50 μm thick maleic anhydride-modified polyethylene (Mitsui Chemicals) Company: Admer NE060, density 0.92 g / cc, melt flow rate 1.0, softening temperature 104 ° C .: heat fusion layer 2) are sequentially laminated, and further heat laminated with a 150 ° C. heat roller.

  The softening temperature is a temperature measured according to JIS K7196 “Testing method for softening temperature of thermoplastic film and sheet by thermomechanical analysis”. The same applies to other insulating coating layers and thermoplastic resin sheets described below.

  FIG. 1 is a conceptual cross-sectional view conceptually showing the structure of the main part of the insulating coating layer a. In FIG. 1, reference numerals 11 and 13 denote maleic anhydride-modified polyethylene layers, which correspond to the heat fusion layer 1 and the heat fusion layer 2, respectively. Reference numeral 12 denotes a softening-resistant layer made of polyester, and reference numeral 12a denotes a through hole.

  During heat lamination, the melted maleic anhydride-modified polyethylene enters the through-hole 12a from both the upper and lower maleic anhydride-modified polyethylene layers 11 and 13 by pressing with a heat roller, as indicated by the arrows, It fuses inside the through-hole 12a.

  Further, by filling the inside of the through-hole 12a with maleic anhydride-modified polyethylene, the contact area between the softening-resistant layer 12 and the maleic anhydride-modified polyethylene layers 11, 13 and the like increases, The adhesive force with the maleic anhydride-modified polyethylene layers 11 and 13 also increases. That is, the adhesive force between the layers constituting the insulating coating layer a increases.

Insulating coating layer b:
Instead of the 25 μm thick polyester having through holes in the thickness direction, a 45 μm thick polyester mesh (manufactured by NBC Corporation: L315PW, wire diameter 30 μm, 315 mesh / inch, opening rate 40%, softening temperature 251 It was obtained in the same manner as the insulating coating layer a except that [° C .: hardly softened layer] was used. Accordingly, the basic configuration of the insulating coating layer b other than the softening-resistant layer is the same as the configuration shown in FIG.

Insulating coating layer c:
Insulation except that a polyester nonwoven fabric having a thickness of 90 μm (Asahi Kasei Fibers Co., Ltd .: Eltus E01012, softening temperature 255 ° C .: hard to soften layer) was used instead of the 25 μm thick polyester having through holes in the thickness direction. It was obtained in the same manner as the coating layer a. Accordingly, the basic configuration of the insulating coating layer c other than the softening-resistant layer is the same as the configuration shown in FIG.

Insulating coating layer d:
This is a resin sheet made of maleic anhydride-modified polyethylene (manufactured by Mitsui Chemicals, Inc .: Admer NE060, density 0.92 g / cc, melt flow rate 1.0, softening temperature 104 ° C.) having a thickness of 100 μm.

[Production of enclosure for evaluation test]
A 25 μm thick polyamide sheet is bonded to one side of a 40 μm thick aluminum foil by dry lamination, and the following four types of thermoplastic resin sheets (1, 2, 3, 4) are attached to the other side: Each (insulating layer) was stuck by thermal lamination to obtain a laminate film. The obtained laminate film was used so that the polyamide sheet came to the outer layer side, and an evaluation test enclosure having an opening (seal part) on one side was produced.

Thermoplastic resin sheet 1:
Maleic anhydride-modified polyethylene with a thickness of 50 μm (density 0.92 g / cc, melt flow rate 1.0, melting point 123 ° C .: heat-sealing layer), through-holes with a hole diameter of 1 mmφ in the thickness direction and a porosity of 28% Polyester having a thickness of 25 μm (manufactured by Toray Industries, Inc .: Lumirror S10, softening temperature 253 ° C .: hardly softened layer), and 50 μm thick maleic anhydride-modified polyethylene (density 0.92 g / cc, melt flow rate 1.0, Melting point: 123 ° C .: heat-bonding layer) are sequentially laminated, and further heated and laminated with a heat roller at 150 ° C.

  FIG. 2 is a conceptual cross-sectional view conceptually showing the structure of the main part of the laminate film to which the thermoplastic resin sheet 1 is attached. In FIG. 2, reference numerals 21 and 23 denote heat-sealable layers made of maleic anhydride-modified polyethylene (corresponding to heat-sealable layer a and heat-sealable layer b, respectively), and 22 denotes a softening-resistant layer made of polyester. Yes, 22a is the through hole, 29 is a polyamide layer, and 28 is an aluminum foil.

  During the heat lamination, the melted maleic anhydride-modified polyethylene enters into the through-hole 22a by pressing with a heat roller from both the upper and lower maleic anhydride-modified polyethylene layers 21 and 23 as indicated by arrows, It fuses inside the through-hole 22a.

  Further, by filling the inside of the through hole 22a with maleic anhydride-modified polyethylene, the contact area between the softening-resistant layer 22 and the maleic anhydride-modified polyethylene layers 21, 23, etc. is increased, and the maleic anhydride-modified polyethylene layer 21, The adhesive force with 23 also increases. That is, the adhesive force between each layer which comprises the thermoplastic resin sheet 1 increases.

Thermoplastic resin sheet 2:
Instead of the 25 μm thick polyester having through holes in the thickness direction, a 45 μm thick polyester mesh (manufactured by NBC Corporation: L315PW, wire diameter 30 μm, 315 mesh / inch, opening rate 40%, softening temperature 251 It was obtained in the same manner as the thermoplastic resin sheet 1 except that [° C .: hard softening layer] was used. Therefore, the basic structure of the thermoplastic resin sheet 2 other than the softening-resistant layer is the same as that shown in FIG.

Thermoplastic resin sheet 3:
Heat was used except that a polyester nonwoven fabric having a thickness of 90 μm (Asahi Kasei Fibers Co., Ltd .: Eltus E01012, softening temperature 255 ° C .: hard to soften layer) was used instead of the 25 μm thick polyester having through holes in the thickness direction. It was obtained in the same manner as the plastic resin sheet 1. Therefore, the basic structure of the thermoplastic resin sheet 3 other than the softening-resistant layer is the same as that shown in FIG.

Thermoplastic resin sheet 4:
This is a resin sheet made of maleic anhydride-modified polyethylene (manufactured by Mitsui Chemicals, Inc .: Admer NE060, density 0.92 g / cc, melt flow rate 1.0, softening temperature 104 ° C.) having a thickness of 100 μm.

(Evaluation test method and results)
Using the lead conductor with an insulating coating layer and the encapsulated container obtained as described above in the combinations shown in Table 1, the seal portion through which the lead conductor with the insulating coating layer penetrated was 150 ° C. for 1 minute. A non-aqueous electrolyte battery was manufactured by heat fusion. Table 1 shows the number of shorted samples among the 10 samples thus manufactured.

  In addition, FIG. 3 is sectional drawing showing the seal part of the nonaqueous electrolyte battery manufactured in the Example, and its vicinity, and shows the mode of enclosure in a seal part. FIG. 3a relates to the nonaqueous electrolyte batteries of Examples 1 to 3, and FIG. 3b relates to the nonaqueous electrolyte batteries of Examples 4 to 6. In the figure, reference numeral 33 denotes two lead conductors (only one is shown in the figure), which are connected to the positive electrode 34 and the negative electrode 35, respectively. In the example of FIG. 3b, the lead conductor 33 is covered with only one layer of the maleic anhydride-modified polyethylene layer 36 (heat fusion layer), but in the example of FIG. 3a, the lead conductor 33 is modified with maleic anhydride. It is covered with three layers of a polyethylene layer 36, a softening-resistant layer 37, and a maleic anhydride-modified polyethylene layer 36 '. The softening-resistant layer 37 has a through hole 30 in the thickness direction as shown in FIG.

  In FIG. 3, reference numeral 38 denotes a laminate film constituting the enclosing container. The laminate film 38 has an aluminum foil 32 (metal layer), and a polyamide layer 39 is laminated on the outer side (the side opposite to the lead conductor 33). In the example of FIG. 3a, on the lead conductor 33 side of the laminate film 38, the aluminum foil 32 is covered with only one layer of the maleic anhydride-modified polyethylene layer 40 (thermal fusion layer). On the lead conductor 33 side of the laminate film 38, the aluminum foil 32 is covered with three layers of a maleic anhydride-modified polyethylene layer 40, a softening-resistant layer 41, and a maleic anhydride-modified polyethylene layer 40 ′. As shown in FIG. 2, the hardly softened layer 41 has through holes 31 in the thickness direction.

  As shown in the results of Table 1, when either the insulating coating layer of the lead conductor with the insulating coating layer or the thermoplastic resin sheet of the enclosure is applicable to the present invention (Examples 1 to 6), that is, the softening layer When it has, there is no short circuit. However, both the insulating coating layer and the thermoplastic resin sheet have a short softening layer (comparative example) when there is no hard softening layer, and the short softening layer prevents the shorting. It is clearly shown. In the above experiment, the workability was very good and the adhesiveness of the seal part was very good.

It is a conceptual sectional view which shows notionally the principal part of insulating coating layer a of an example. It is a conceptual sectional view which shows notionally a principal part of thermoplastic resin sheet 1 of an example. It is sectional drawing showing the seal | sticker part of the nonaqueous electrolyte battery of an Example, and its vicinity.

11, 13, 21, 23, 36, 36 ', 40, 40' Maleic anhydride-modified polyethylene layer 12, 22, 37, 41 Hardening-resistant layer 12a, 22a, 30, 31 Through hole 28, 32 Aluminum foil 29, 39 Polyamide layer 33 Lead conductor 34 Positive electrode 35 Negative electrode 38 Laminate film

Claims (4)

  An enclosure made of a metal layer and a resin film covering the metal layer, a lead conductor extending from the inside of the enclosure, and a nonaqueous electrolyte enclosed inside the enclosure and the inside of the enclosure A battery having an electrode connected to an end portion of the lead conductor, wherein the lead conductor and the enclosing container are fused by a seal portion via a heat-fusible layer, and the metal of the seal portion Between the layer and the lead conductor, there is a heat-sealing layer 1 covering the lead conductor, and the heat-sealing layer 1 is covered with a through hole having a hole diameter of 0.05 mm to 2 mm in the thickness direction. A non-aqueous electrolyte battery comprising: a non-softening layer having a porosity of 10% to 70%; and a heat-sealing layer 2 that covers the hard-softening layer.   A lead conductor with an insulating coating layer used in the nonaqueous electrolyte battery according to claim 1, comprising a lead conductor and an insulating coating layer covering at least a portion corresponding to the seal portion, and the insulating coating layer includes: A heat-sealing layer 1 for covering the lead conductor, the heat-sealing layer 1 is covered, and a through hole having a hole diameter of 0.05 mm to 2 mm is provided in the thickness direction, and the opening ratio is 10% to 70%. A lead conductor with an insulating coating layer, comprising: a softening layer; and a heat-sealing layer 2 that covers the softening layer.   The lead conductor with an insulation coating layer according to claim 2, wherein the softening-resistant layer is a mesh layer made of resin fibers.   The lead conductor with an insulation coating layer according to claim 2, wherein the softening-resistant layer is a nonwoven fabric layer made of resin fibers.

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