KR20220013587A - Electrical component lead wire and electrical component - Google Patents

Abstract

A lead wire for electrical components according to an embodiment of the present invention includes a strip-shaped conductor and a pair of insulating films covering both surfaces of the strip-shaped conductor, and the elastic modulus of the strip-shaped conductor is D _m [Pa], width 1 Let the secondary moment of cross-section per mm be I _m [m ⁴ /1 mm], the average modulus of elasticity of the pair of insulating films is D _i [Pa], and the secondary moment of cross-section per 1 mm of width is I _i [m ⁴ ] /1 mm], the width 1 mm of the insulating film shown by the formula (2) with respect to the shape holding force H [N·m 2 / 1 mm] per 1 mm of the width of the strip-shaped conductor represented by the formula (1) The ratio (R/H) of the elastic recovery force R [N·m 2 / 1 mm] of sugar is 0.15 or less.
H=D _m × I _m … (One)
R=D _i ×I _i … (2)

Description

Lead wire for electrical components and electrical components

The present invention relates to a lead wire for an electrical component and an electrical component.

BACKGROUND ART In accordance with the demand for miniaturization of electronic devices, there is an increasing demand for miniaturization and weight reduction of batteries used as power sources. On the other hand, high energy density and high energy efficiency of the battery are also required. In order to satisfy these demands, expectations for non-aqueous electrolyte batteries (eg, lithium ion batteries, etc.) in which an electrode, an electrolyte, and the like are enclosed in an encapsulant are increasing.

In such a nonaqueous electrolyte battery, in order to take out current to the outside, it is common that a lead wire is extended from a sealing body. As a lead wire, what consists only of metal lead conductors, such as aluminum, and what coat|covered the lead conductor with the insulating layer of a thermoplastic resin is known. And a lead wire is attached to a sealing body by heat-sealing the open edge part in the state which pinched|interposed a lead wire by the inner surface of the opening edge part of a sealing body, for example.

In this method of attaching a lead conductor to a sealing body by heat sealing, there is a possibility that the insulating layer is melted by the heat at the time of heat sealing and the lead conductor is short-circuited with the metal layer of the sealing body. Therefore, it has been proposed that the insulating layer includes a crosslinked layer made of crosslinked polyolefin to avoid melting of the insulating layer (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 2001-102016 Japanese Patent Laid-Open No. 2009-259739

A lead wire for electric parts according to one embodiment of the present invention is a lead wire for electric parts comprising a strip-shaped conductor and a pair of insulating films covering both surfaces of the strip-shaped conductor, Let the elastic modulus of the conductor be D _m [Pa], the second moment of inertia of area per 1 mm in width is I _m [m ⁴ /1 mm], and When the average modulus of elasticity is D _i [Pa] and the cross-sectional secondary moment per 1 mm in width is I _i [m ⁴ /1 mm], the shape retention force per 1 mm of width of the strip-shaped conductor represented by the following formula (1) The ratio (R/H) of the elastic recovery force R [N·m 2 / 1 mm] per width 1 mm of the insulating film represented by the following formula (2) to H [N·m 2 / 1 mm] is 0.15 or less.

H=D _m × I _m … (One)

R=D _i ×I _i … (2)

The electrical component which concerns on 1 aspect of this invention is equipped with the said lead wire for electrical components.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which cut-away part for demonstrating an example of the lithium ion battery which concerns on another one aspect of this invention.
FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. 1 .
Fig. 3(a) is a schematic cross-sectional view seen in the longitudinal direction for explaining the secondary moment of cross section of the strip-shaped conductor and the insulating film in the lead wire for electric parts according to one embodiment of the present invention.
Fig. 3(b) is a schematic cross-sectional view showing only the strip-shaped conductor of the lead wire for electric parts of Fig. 3(a).
FIG.3(c) is a schematic sectional drawing which shows only the insulating film of the lead wire for electrical components of FIG.3(a).
It is a schematic plan view for demonstrating the lead wire used for evaluation of the spring back angle.
Fig. 4(b) is a schematic cross-sectional view of the lead wire of Fig. 4(a).
Fig. 5 (a) is a schematic cross-sectional view for explaining one step of the evaluation method of the springback angle.
Fig. 5(b) is a schematic cross-sectional view for explaining the next step of Fig. 5(a).
6 is a graph showing the relationship between the measurement result of the springback angle and the ratio (R/H) of the elastic recovery force R per 1 mm width of a pair of insulating films to the shape retaining force H per 1 mm width of the strip-shaped conductor. .

[Problems to be solved by the present disclosure]

The conventional nonaqueous electrolyte battery having the lead wire is often accommodated in an electronic device with the lead wire bent. Therefore, when manufacturing the electronic device, the lead wire included in the nonaqueous electrolyte battery is bent at a location where the lead conductor is covered with an insulating layer, and is sent to a downstream process while maintaining this bent shape. Therefore, when it is assumed that a lead wire is bent and used, it is hard to produce a springback, and the lead wire which can hold|maintain a bend shape appropriately is calculated|required.

Here, a lead conductor is metal, such as aluminum, and when it bends, it plastically deforms, and produces|generates the force which tends to maintain a bent shape. On the other hand, since the insulating layer is made of resin or the like, when it is bent, it elastically deforms, and a force to return from the bent shape to the original shape is generated. Among these two forces, when a force to return to the original shape from the bent shape due to the elastic deformation of the insulating layer is strongly applied, the lead wire cannot maintain the bent shape and slightly returns to its original shape (spring). hundred) occurs. However, since springback is a complicated phenomenon caused by the interaction of two members with different materials, a metal lead conductor and a resin insulating layer, applying a certain member to the lead conductor and insulating layer can sufficiently suppress springback. It is difficult to accurately predict whether

An object of the present invention is to provide a lead wire for electric parts and electric parts that are less prone to springback when bent and used and can properly maintain a bent shape.

[Effects of the Invention]

ADVANTAGE OF THE INVENTION According to the said invention, the lead wire for electrical components which is hard to produce a springback when bending and using it, and can maintain a bending shape appropriately, and the electrical component excellent in work efficiency can be provided.

[Description of embodiment of the present invention]

A lead wire for electric parts according to one embodiment of the present invention is a lead wire for electric parts comprising a strip-shaped conductor and a pair of insulating films covering both surfaces of the strip-shaped conductor, wherein the elastic modulus of the strip-shaped conductor is D _m [Pa], the cross-sectional secondary moment per 1 mm in width is I _m [m ⁴ /1 mm], and the average elastic modulus of the pair of insulating films is D _i [Pa], the cross-sectional secondary moment per 1 mm in width In the case where I _i [m ⁴ /1 mm], in the following equation (2) for the shape retaining force H [N·m 2 / 1 mm] per 1 mm width of the strip-shaped conductor shown in the following equation (1) The ratio (R/H) of the elastic recovery force R [N·m 2 / 1 mm] per width 1 mm of the shown insulating film is 0.15 or less.

H=D _m × I _m … (One)

R=D _i ×I _i … (2)

Here, the reason why a springback occurs in the lead wire is that, as described above, rather than the force trying to maintain the bent shape caused by the plastic deformation of the strip-shaped conductor, it is more I think it's because the force is strong. Therefore, when the force resulting from the plastic deformation of the strip-shaped conductor is increased while the force resulting from the elastic deformation of the insulating film is made small, it is thought that springback is suppressed and the bending shape of the lead wire is easily maintained. Here, it is thought that whether a lead wire can hold|maintain a bent shape, ie, the easiness of generation|occurrence|production of a springback depends not only on the material of a strip-shaped conductor or an insulating film, but also on these thickness and a shape. Therefore, the present inventors have found that the effect of the strip-shaped conductor of the lead wire for electric component on the springback is the shape per 1 mm in width expressed in the above formula (1) using the elastic modulus and the secondary moment of cross section per 1 mm in width as parameters. It was found that it can be judged by the holding power. In addition, the present inventors have found that the effect of the insulating film of the lead wire for electric component on the springback is the elastic modulus and the elastic recovery force per 1 mm in width expressed in the above formula (2), which uses the elastic modulus and the cross-sectional secondary moment per 1 mm in width as parameters. found that it can be judged as In addition, the present inventors have found that the effect of the insulating film and the strip-shaped conductor on the springback of the lead wire for electrical component is the elastic recovery force per 1 mm of width of a pair of insulating films with respect to the shape-retaining force per 1 mm of the width of the strip-shaped conductor. In relation to the ratio of , it was found that by making the ratio equal to or less than the above upper limit, it was difficult to produce a springback when bent and used, and the bent shape could be appropriately maintained.

In this way, in the lead wire for electrical components, when the ratio of the elastic recovery force per 1 mm in width of the pair of insulating films to the shape retaining force per 1 mm in width of the strip-shaped conductor is below the upper limit, springback is less likely to occur and the bending shape is reduced can be properly maintained. Therefore, when the lead wire is bent and used, the bent shape is easily maintained, so that it is not necessary to fix the bent lead wire to another element using a fixing tape or the like after the lead wire is bent. As a result, the said lead wire for electrical components can simplify the manufacturing process in the case of bending and using, and can contribute to space saving by bending and using it.

Here, "average thickness" means the average value of the thickness measured at arbitrary 5 points|pieces. The "modulus of elasticity" refers to the rising slope of the SS curve (stress-strain curve) when tensile strain is applied to the strip-shaped conductor and insulating film using a precision universal testing instrument (tensile tester; precision universal testing instrument). indicates In the measurement of this elastic modulus, the sample gripping (chuck) interval of the tensile tester is set to 50 mm, and the tensile force is assumed to be 50 mm/min. However, when measuring the elastic modulus of a strip-shaped conductor, in order to consider the effect of sliding between the sample and the gripper of the testing machine, a strain gauge capable of measuring a minute displacement is provided on the sample and measured. In addition, the test force [N]-travel distance [mm] curve obtained directly from the measurement of this modulus of elasticity is the stress [Pa] using the sample size and chuck spacing as shown in the following Equations (3) and (4). It is converted into a ]-strain [%] curve to obtain the elastic modulus. In addition, even when the strip-shaped conductor and the insulating film are multilayered structures, the modulus of elasticity can be obtained by the method described above. In addition, "the average elastic modulus of a pair of insulating films" means the average of the measured values of each elastic modulus of two insulating films. Hereinafter, in the case of "average thickness" or "modulus of elasticity", it is defined similarly.

Stress [Pa] = Test force [N] ÷ Width [mm] ÷ Thickness [mm] … (3)

Deformation [%] = travel distance [mm] ÷ chuck spacing [mm] × 100 … (4)

As for the lead wire for electrical components, it is good that the bending restoration angle after bending 180 degrees is 20 degrees or less. According to such a lead wire, the bending restoration angle after bending by 180°, that is, when the springback angle is 20° or less, the bent shape can be more appropriately maintained, so the operation of bending the lead wire and holding the shape becomes easier. Workability is further improved.

The elastic recovery force R is preferably 3.0×10 ^-5 N·m 2/1 mm or more and 6.0×10 ^-3 N·m 2/1 mm or less. According to such a lead wire, when the said elastic recovery force R is the said range, the springback after the said lead wire for electrical components is bent can be made small appropriately. As a result, the bending operation|work of the said lead wire for electrical components becomes easier, and workability|operativity improves more.

The shape retaining force H is preferably 3.0×10 ^-4 N·m 2/1 mm or more and 6.0×10 ^-2 N·m 2/1 mm or less. According to such a lead wire, when the said shape-retaining force H is the said range, since a bending shape can be maintained more appropriately, the shape-retaining property which can maintain a bending shape suitably can be provided to the said lead wire for electrical components. As a result, the bending operation|work of the said lead wire for electrical components becomes easier, and workability|operativity improves more.

The average thickness of the strip-shaped conductor is preferably 30 µm or more and 200 µm or less, and the elastic modulus of the strip-shaped conductor is preferably 50 GPa or more and 300 GPa or less. According to such a lead wire, the shape-retaining force which can make the shape-retaining force of a strip-shaped conductor into an appropriate range, and can maintain a bending shape suitably to the said lead wire for electrical components can be provided. As a result, the bending operation|work of the said lead wire for electrical components becomes easier, and workability|operativity improves more.

As an average thickness of each said insulating film, 25 micrometers or more and 200 micrometers or less are all preferable, and 100 MPa or more and 1,400 MPa or less are all preferable as an elastic modulus of each said insulating film. According to such a lead wire, the elastic recovery force of an insulating film can be made into an appropriate range, and the springback after bending of the said lead wire for electrical components can be made small appropriately. As a result, the bending operation|work of the said lead wire for electrical components becomes easier, and workability|operativity improves more.

The electric component which concerns on 1 aspect of this invention is equipped with the said lead wire for electric components. Since the said electrical component is equipped with the said lead wire for electrical components, work efficiency can be improved by being able to simplify the bending of the said lead wire for electrical components, and the operation|work which maintains the shape.

The electrical component may be a non-aqueous electrolyte battery. As described above, the electrical component can be suitably used as a nonaqueous electrolyte battery because of its excellent working efficiency.

[Details of embodiment of the present invention]

Specific examples of the lead wire for electric parts and electric parts according to the embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited to these illustrations, It is shown by a claim, and it is intended that the meaning equivalent to a claim and all the changes within the range are included.

<Lead wire for electrical parts>

1 and 2, the lead wire 1 for electrical components according to the embodiment of the present invention is a strip-shaped conductor 2 and a pair of insulating films covering both surfaces of the strip-shaped conductor 2 (3) is provided.

(strip shape conductor)

The strip-shaped conductor 2 is connected to the electrodes (positive electrode 5A and negative electrode 5B) of electric components, such as the lithium ion battery 4, etc. This strip-shaped conductor 2 is formed of a material with high conductivity. Examples of such a highly conductive material include metal materials such as aluminum, titanium, nickel, copper, aluminum alloy, titanium alloy, nickel alloy, and copper alloy, and materials in which these metal materials are plated with nickel, gold, or the like. can As a forming material of the strip-shaped conductor 2 connected to the positive electrode 5A of an electric component such as a lithium ion battery 4, a material that does not dissolve during discharge, specifically, aluminum, titanium, an aluminum alloy, and a titanium alloy. desirable. On the other hand, as a forming material of the strip-shaped conductor 2 connected to the cathode 5B, nickel, copper, a nickel alloy, a copper alloy, nickel-plated copper, and gold-plated copper are preferable. Moreover, the strip-shaped conductor 2 may be surface-treated, such as a chromate treatment (chromate treatment), trivalent chromium treatment, a non-chromate treatment, and a roughening process, for the improvement of electrolyte solution resistance, etc. By such surface treatment, the electrolytic solution resistance of the strip-shaped conductor 2 can be improved.

When the elastic modulus of the strip-shaped conductor 2 is D _m [Pa] and the cross-sectional secondary moment per 1 mm in width is I _m [m ⁴ /1 mm], the strip-shaped conductor 2 represented by the following formula (1) ), the lower limit of the shape holding force H [N·m 2 / 1 mm] per 1 mm of width is preferably 3.0 × 10 ^-4 N·m 2 / 1 mm, more preferably 2.0 × 10 ^-3 N·m 2 / 1 mm do. The upper limit of the shape holding force H is preferably 6.0×10 ^-2 N·m 2/1 mm, and more preferably 1.0×10 ^-2 N·m 2/1 mm.

H=D _m × I _m … (One)

When the shape-retaining force H is in the above range, the strip-shaped conductor 2 can maintain the bent shape more appropriately, so that the lead wire for electric component 1 has shape-retaining properties that can properly maintain the bent shape. can As a result, bending of the lead wire 1 for electrical components and the operation|work which hold|maintains the shape become easier, and workability|operativity improves more.

Here, the secondary moment of cross-section per 1 mm of width of the strip-shaped conductor 2 in the above formula (1) and the moment of cross-section per 1 mm of width of the pair of insulating films 3 in the formula (2) to be described later are The calculation method is demonstrated by the lead wire 11 for electrical components of Fig.3 (a) as an example. As for the lead wire 11 for electrical components shown to Fig.3 (a), the average thickness of a pair of insulating films 13 is the same, and the average width|variety is the same. Let the average thickness of this lead wire 11 for electrical components be T, the average thickness of the strip-shaped conductor 12 shall be T _m [m], and let each average thickness of a pair of insulating films 13 be T _i [m]. . In addition, let the average width of the strip-shaped conductor 12 be W _m [m], and let the average width of a pair of insulating films 13 be W _i [m]. In addition, the plane which divides the lead wire 11 for electrical components into two in the thickness direction (the plane which divides the strip-shaped conductor 12 in the thickness direction in half) is regarded as the center plane M of bending deformation of the lead wire 11 for electrical parts can do.

Next, the cross-sectional moment of the strip-shaped conductor 12 can be calculated by the following formula (5) based on the cross-sectional shape shown in Fig. 3(b). Similarly, the cross-sectional moment of the pair of insulating films 13 can be calculated by the following formula (6) based on the cross-sectional shape shown in Fig. 3(c).

Secondary moment of cross-section per 1 mm of width of strip-shaped conductor [m ⁴ /1 mm] = 1/12 × average width of strip-shaped conductor W _m [m] × (average thickness of strip-shaped conductor T _m [m]) ³ / average width W _m [mm] of strip-shaped conductor... (5)

Secondary moment of cross section per 1 mm of width of a pair of insulating films [m ⁴ /1 mm] = 1/12 × Average width of a pair of insulating films W _i [m] × {(Average thickness T of lead wire for electrical parts [m]) ³ - (Average thickness T _m [m] of strip-shaped conductor) ³ }/1 average width of a pair of insulating films W _i [mm] . . . (6)

In addition, when the average thickness or average width of a pair of insulating films 3 of the lead wire 1 for electrical components is not the same, the average value of each average thickness or each average width of a pair of insulating films 3 is obtained, , the above calculation is performed assuming that the average thickness or average width of the pair of insulating films 3 are all the above average values. Then, the shape-retaining force H and the elastic recovery force R are determined by using the cross-sectional secondary moment per 1 mm in width of the strip-shaped conductor 2 and the pair of insulating films 3 obtained by this calculation.

As a lower limit of the cross-sectional moment per 1 mm of width of the strip-shaped conductor 2, 5.0x10 ^-15 m ⁴ /1 mm is preferable, and ^{2.0x10 -14} m ⁴ /1 mm is more preferable. On the other hand, as the upper limit of the cross-sectional moment, 8.0×10 ^-13 m ⁴ /1 mm is preferable, and 1.0×10 ^-13 m ⁴ /1 mm is more preferable. When the cross-sectional moment is within the above range, the shape retaining force H per 1 mm of width of the strip-shaped conductor 2 can be easily and reliably adjusted within the above range.

As an average thickness of the strip-shaped conductor 2, 30 micrometers or more and 200 micrometers or less are preferable. As a lower limit of the average thickness of the strip-shaped conductor 2, 40 micrometers is more preferable, and 47 micrometers is still more preferable. On the other hand, as an upper limit of the average thickness of the strip-shaped conductor 2, 150 micrometers is more preferable, and 120 micrometers is still more preferable. When the average thickness of the strip-shaped conductor 2 is less than the said minimum, there exists a possibility that the electrical resistance value of the lead wire 1 for electrical components may increase. Conversely, when the said average thickness exceeds the said upper limit, the lead wire 1 for electrical components becomes thick unnecessarily, and there exists a possibility that it may not fully respond to the request|requirement of thickness reduction.

As an elastic modulus of the strip-shaped conductor 2, 50 GPa or more and 300 GPa or less are preferable. As a lower limit of the elastic modulus of the strip-shaped conductor 2, 60 GPa is more preferable, and 67 GPa is more preferable. On the other hand, as an upper limit of the elastic modulus of the strip-shaped conductor 2, 250 GPa is more preferable, and 210 GPa is more preferable. When the elastic modulus of the strip-shaped conductor 2 is less than the said minimum, there exists a possibility that it may become difficult to suppress the springback of the lead wire 1 for electrical components. Conversely, when the said elastic modulus exceeds the said upper limit, there exists a possibility that workability|operativity may fall by requiring force for the bending operation|work of the lead wire 1 for electrical components. Moreover, the elastic modulus of the strip-shaped conductor 2 can be adjusted by the change of the material, In particular, by making the strip-shaped conductor 2 into an alloy, the elastic modulus can be finely adjusted by the change of an alloy component.

Moreover, since the average thickness of the strip-shaped conductor 2 is 30 micrometers or more and 200 micrometers or less, and the elastic modulus is 50 GPa or more and 300 GPa or less, the shape holding force H is made into a suitable range, and the lead wire for electrical components 1 It is possible to impart shape retentivity capable of properly maintaining the bent shape. As a result, the shape fixing operation|work at the time of bending of the lead wire 1 for electrical components becomes easier, and workability|operativity improves more.

(1 pair of insulating film)

The pair of insulating films 3 cover both sides of the central portion of the strip-shaped conductor 2 in a state in which both ends of the strip-shaped conductor 2 are exposed, for example, a lithium ion battery 4 or the like. It is a part that is fixed to the encapsulation body 6 of the electrical component.

Each insulating film 3 is formed of a high insulating resin material. It is preferable that this resin material is a resin material with high adhesiveness to the strip-shaped conductor 2, or a resin material which is hard to melt|dissolve by heating at the time of heat-sealing the encapsulation body 6 .

As a resin material with high adhesiveness to the strip-shaped conductor 2, a thermoplastic polyolefin etc. are mentioned, for example. Examples of the thermoplastic polyolefin include reactive resins such as polyethylene, acid-modified polyethylene, polypropylene, acid-modified polypropylene (eg, maleic anhydride-modified polypropylene), ionomer, and the like. mixtures, and the like.

On the other hand, as a resin material which is hard to melt|dissolve by heating at the time of heat-sealing the sealing body 6, crosslinked polyolefin etc. are mentioned, for example. As this crosslinked polyolefin, what crosslinked the polyolefin illustrated above can be used. As a method of crosslinking polyolefin, crosslinking by irradiation with ionizing radiation such as electron beams or gamma rays, chemical crosslinking by peroxide or the like, silane crosslinking, or the like are used. When the polyolefin is crosslinked by ionizing radiation, a cross-linking assistant is added to the polyolefin as needed. Examples of the crosslinking aid include trimethylol propane methacrylate, pentaerythritol triacrylate, ethylene glycol dimethacrylate, triallyl cyanurate ( triallyl cyanurate), triallyl isocyanurate, etc. are used.

The gel fraction in the crosslinked polyolefin is preferably 20% or more and 90% or less. In addition, the gel fraction is an index indicating the degree of crosslinking, and refers to the ratio of the gel (insoluble polymer chains) in the crosslinked polyolefin that is not dissolved in a solvent such as xylene. If the gel fraction is less than 20%, the degree of crosslinking is insufficient, and there is a fear that the insulating film 3 may be melted during heat sealing. Conversely, when the gel fraction exceeds 90%, the degree of crosslinking is too large, and there is a fear that the adhesion between the crosslinked polyolefin and the encapsulant 6 and the like may deteriorate.

In addition, each insulating film 3 may be a single layer, or what was laminated|stacked in multiple layers may be sufficient as it. When the insulating film 3 is configured as a plurality of layers, the insulating film 3 is an insulating layer formed of a resin material with high adhesiveness to the strip-shaped conductor 2, and the sealing body 6 is heat-sealed. It is preferable to include an insulating layer formed of a resin material that is difficult to melt by heating. When the insulating film 3 of such a laminated structure is employ|adopted, while being able to ensure the adhesiveness to the strip-shaped conductor 2, melting at the time of heat sealing can be prevented.

When the average elastic modulus of the pair of insulating films 3 is D _i [Pa] and the cross-sectional secondary moment per 1 mm in width is I _i [m ⁴ /1 mm], the pair represented by the following formula (2) As a lower limit of the elastic recovery force R [ ^N ·m 2 / 1 ^mm ] per 1 mm of width of the insulating film 3 of 1 mm is more preferable. On the other hand, as the upper limit of the elastic recovery force R, 6.0×10 ^-3 N·m 2/1 mm is preferable, and 1.0×10 ^-3 N·m 2/1 mm is more preferable.

R=D _i ×I _i … (2)

When the elastic recovery force per width 1 mm of a pair of insulating films 3 shall be the said range, the springback after bending of the lead wire 1 for electrical components can be suppressed suitably. As a result, the operation|work which bends the lead wire 1 for electrical components and maintains the shape becomes easier, and workability|operativity improves more. In addition, the elastic modulus of the insulating film 3 can be adjusted by changing the material, and when each insulating film 3 is formed of a crosslinked resin, the elastic modulus can be adjusted also by changing the degree of crosslinking.

As a lower limit of the cross-sectional moment per 1 mm of width of the pair of insulating films ³ , ^{1.0x10-13 m4} /1mm is preferable ^{and 5.0x10-13m4} /1mm is more preferable. On the other hand, as the upper limit of the cross-sectional moment, 8.0×10 ^-12 m ⁴ /1 mm is preferable, and 1.0×10 ^-12 m ⁴ /1 mm is more preferable. By making the said cross-sectional moment into the said range, the elastic recovery force per 1 mm of width of a pair of insulating films 3 can be easily and reliably adjusted to the said range.

As an average thickness of each insulating film 3, 25 micrometers or more and 200 micrometers or less are all preferable. As a lower limit of the said average thickness, 40 micrometers is more preferable, and 60 micrometers is still more preferable. On the other hand, as an upper limit of the said average thickness, 120 micrometers is more preferable, and 80 micrometers is still more preferable. When the average thickness of each insulating film 3 is less than the said lower limit, the thickness of the insulating film 3 becomes too thin with respect to the thickness of the strip-shaped conductor 2, As a result, the lead wire 1 for electrical components is encapsulated. When it heat-seals in order to adhere to (6), there exists a possibility of short circuiting between the strip-shaped conductor 2 and the sealing body 6 . The fear of this short circuit is particularly remarkable at the edge portions (both ends in the width direction) of the strip-shaped conductor 2 . Conversely, when the said average thickness exceeds the said upper limit, there exists a possibility that the springback of the lead wire 1 for electrical components cannot fully be suppressed.

It is preferable that each average thickness and elastic modulus of each insulating film 3 are substantially the same. Specifically, the ratio of the average thickness of the insulating film 3 on the other side to the average thickness of the insulating film 3 on the one side (average thickness of the insulating film 3 on one side / the insulating film 3 on the other side) ) is preferably 0.95 or more and 1.05 or less. In addition, the ratio of the elastic modulus of the insulating film 3 on the other side to the elastic modulus of the insulating film 3 on the one side (the elastic modulus of the insulating film 3 on the one side / the elastic modulus of the insulating film 3 on the other side) is It is preferable that they are 0.7 or more and 1.5 or less.

In addition, as the lower limit of the ratio (average thickness of insulating film/average thickness of strip-shaped conductor) of the average thickness of each insulating film 3 to the average thickness of the strip-shaped conductor 2, 0.2 is preferable in all, and 0.3 is More preferably, 0.35 is still more preferable. On the other hand, as an upper limit of the said ratio, 1.5 is preferable, 1.2 is more preferable, and 1.0 is still more preferable. When the ratio of the average thickness of each insulating film 3 to the average thickness of the strip-shaped conductor 2 is all within the above range, the elasticity of the pair of insulating films 3 with respect to the shape-retaining force of the strip-shaped conductor 2 is The ratio of the recovery force can be adjusted in an appropriate range, and as a result, it becomes possible to make the springback angle small and to maintain the desired bending shape.

Ratio of the secondary moment of cross-section per 1 mm of width of the pair of insulating films 3 to the secondary moment of cross-section per 1 mm of width of the strip-shaped conductor 2 (Secondary of cross-section per 1 mm of width of the pair of insulating films) As a lower limit of moment/secondary moment of cross-section per 1 mm of width of a strip-shaped conductor), 1.0 is preferable and 3.0 is more preferable. On the other hand, as an upper limit of the said ratio, 4.0x10 is preferable and 2.5x10 is more preferable. When the ratio is within the above range, the ratio of the elastic recovery force of the pair of insulating films 3 to the shape retention force of the strip-shaped conductor 2 can be adjusted to an appropriate range, and as a result, the springback angle is reduced, It becomes possible to maintain the bending shape made desired.

As an elastic modulus of each insulating film 3, 100 Mpa or more and 1,400 Mpa or less are all preferable. As a lower limit of the said elastic modulus, 150 Mpa is more preferable, and 200 Mpa is still more preferable. On the other hand, as an upper limit of the said elastic modulus, 720 Mpa is more preferable, and 350 Mpa is still more preferable. By making the elastic modulus of the insulating film 3 into the said range, the elastic recovery force of the insulating film 3 can be made into an appropriate thing.

In addition, each insulating film 3 has an average thickness of 25 micrometers or more and 200 micrometers or less, and all are 100 MPa or more and 1,400 MPa or less, so that the springback angle after bending of the lead wire 1 for electrical components is suitably small by setting them all as 100 MPa or more and 1,400 MPa or less. can do. As a result, the operation|work which bends the lead wire 1 for electrical components and maintains the shape becomes easier, and workability|operativity improves more.

The lower limit of the ratio of the average elastic modulus of the pair of insulating films 3 to the elastic modulus of the strip-shaped conductor 2 (average modulus of elasticity of the pair of insulating films 3/the elastic modulus of the strip-shaped conductor 2) is 1.0 ×10 ^-3 is preferable, and 2.0×10 ^-3 is more preferable. On the other hand, as an upper limit of the said ratio, 4.0x10 ^-2 is preferable and ^1.5x10-2 is ^more preferable. When the ratio is within the above range, the ratio of the elastic recovery force of the pair of insulating films 3 to the shape retention force of the strip-shaped conductor 2 can be adjusted to an appropriate range, and as a result, the springback angle is reduced, It becomes possible to maintain the bending shape made desired.

In the lead wire 1 for electrical components, the ratio of the elastic recovery force R per width 1 mm of the pair of insulating films 3 to the shape retention force H per width 1 mm of the strip-shaped conductor 2 is 0.15 or less. As an upper limit of the said ratio, 0.10 is preferable and 0.05 is more preferable. Moreover, although there is no restriction|limiting in particular about the lower limit of the said ratio, 0.001 is preferable and 0.002 is more preferable.

As for the lead wire 1 for electrical components, it is preferable that the bending restoration angle (spring back angle) after 180 degree bending is 20 degrees or less. According to this lead wire 1 for electric parts, since the bending shape can be maintained more appropriately by making the bending recovery angle (springback angle) 20 degrees or less after bending by 180°, the shape fixing operation at the time of bending is easier and workability is further improved. Moreover, the said bending restoration angle is so good that it is small, 12 degrees or less are more preferable, 5 degrees or less are still more preferable, and 0 degrees is the most preferable.

<Electrical parts>

The electric component which concerns on embodiment of this invention is equipped with the lead wire 1 for electric components. Examples of the electrical component in which the lead wire 1 for electrical component is used include a non-aqueous electrolyte battery such as a lithium ion battery, a lithium ion capacitor, and a capacitor such as an electric double-layer capacitor (EDLC). have. Of course, the lead wire 1 for electrical components can be applied to all electrical components requiring a lead wire, and the same effect can be acquired even if it applies to batteries other than a nonaqueous electrolyte battery, etc.

Hereinafter, a nonaqueous electrolyte battery provided with the lead wire 1 for electric components is demonstrated, taking a lithium ion battery as an example and referring drawings.

(Lithium-ion battery)

The lithium ion battery 4 shown in FIGS. 1 and 2 encapsulates the battery element holding the nonaqueous electrolyte solution inside the sealing body 6 . The battery element holds the non-aqueous electrolyte in a state in which a separator (not shown) is interposed between the positive electrode 5A and the negative electrode 5B. As the non-aqueous electrolyte, a lithium compound (LiClO ₄ , LiBF ₄ or the like) dissolved in an organic solvent such as propylene carbonate or γ-butyrolactone is used.

The lead wire 1 for electrical components is being fixed to the sealing body 6 with the insulating film 3 . As for the lead wire 1 for electrical components, one end 2A and the other end 2B of the strip-shaped conductor 2 are exposed from the insulating film 3, and this strip-shaped conductor 2 is exposed One end 2A is electrically connected to the positive electrode 5A or the negative electrode 5B of the battery element, while the other exposed end 2B of the strip-shaped conductor 2 is separated from the sealing body 6 . is protruding

Since this lithium ion battery 4 includes the lead wire 1 for electric parts, the work for bending the lead wire 1 for electric parts and maintaining the shape can be simplified, thereby improving work efficiency. can

Moreover, even when it is a case where the lead wire 1 for electrical components is applied to electrical components other than the lithium ion battery 4, work efficiency can be improved by being able to simplify the work for maintaining a bending shape.

(Example)

Next, the present invention will be specifically described with reference to experimental examples, but the present invention is not limited by the following experimental examples, and may be implemented with appropriate modifications within the scope suitable for the spirit of the present invention, all of which are the present invention included in the technical scope of

In this experimental example, the spring back angle of the lead wire was evaluated.

<Lead wire>

The lead wire was formed by coat|covering the center part of a strip-shaped conductor with a pair of insulating films so that the both ends of a strip-shaped conductor might be exposed. 4(a) and 4(b), as the strip-shaped conductor 7, the length L _m is 80 mm, the width W _m is 5 mm, and the elastic modulus and the average thickness T _m are shown in Table 1 below. The value indicated was used. As the insulating film 8, the thing of which length L _i is 6 mm, width W _i is 7 mm, and is the value shown in following Table 1 of elasticity modulus and average thickness _Ti was used for all. In addition, the same thing was used for the insulating film 8 of 2 sheets. In addition, the total average thickness of the strip-shaped conductor 7 and a pair of insulating films 8 was made into the average thickness T of a lead wire.

<Secondary moment of section>

The cross-sectional secondary moment [m ⁴ /1 mm] per 1 mm of width of the strip-shaped conductor 7 is 1/12 × W _m [m] × (T _m [m]) ³ /W _m [mm], each numerical value was obtained by substituting The cross-sectional secondary moment [m ⁴ /1 mm] of the pair of insulating films 8 is 1/12×W _i [m]×{(T[m]) ³ -(T _m [m]) ³ }/ It was calculated|required by substituting each numerical value into W _i [mm].

<Evaluation of spring back angle>

The springback angle was evaluated as follows. First, as shown in Fig. 5(a), the end surface of the plate material X having a thickness of 0.5 mm is brought into contact near the longitudinal center of the insulating film 8 on one side of the lead wire, and the lead wire is slowly rotated 180° so as to sandwich the plate material X. After bending, the load F was made to act by installing a weight of 200 g on the other insulating film 8, and this state was hold|maintained for 10 second. Next, as shown in FIG.5(b), it evaluated by measuring the springback angle (theta)[deg] (angle formed by a lead wire) when the load was removed and left to stand for 5 seconds or more. The measurement results of the spring back angle are shown in Table 1 below. Further, the relationship between the springback angle θ and the ratio (R/H) of the elastic recovery force R per 1 mm width of the pair of insulating films to the shape retaining force H per 1 mm width of the strip-shaped conductor is shown in FIG. 6 . In addition, the elastic recovery force R and the shape retention force H of the lead wire were calculated based on the above formulas (1) and (2), respectively.

As shown in Table 1 and FIG. 6, group A (Production Examples 1 to 4), Group B (Production Examples 5 to 8), and Group C in which the average thickness T1 of the strip-shaped conductor was changed and other conditions were the same. In (Production Examples 9 to 12), in any group, the springback angle θ also became smaller with an increase in the average thickness T1 of the strip-shaped conductor, that is, a decrease in the ratio (R/H) of the elastic recovery force R to the shape retention force H. . In addition, although the thickness T2 of the insulating film is different between groups A to C, when these groups A to C are compared, the thickness T2 of the insulating film increases, that is, the ratio of the elastic recovery force R to the shape retention force H (R/H ), the springback angle θ also increased. From these results, by adjusting the average thickness of the strip-shaped conductor of the lead wire and the average thickness of the insulating film, the ratio (R/H) of the elastic recovery force R to the shape retention force H is 0.15 or less, so that the springback angle of 20° or less is satisfactory. It is judged that the maintenance of the bending restoration shape becomes possible.

In Group D (Production Examples 13 to 14) and Group E (Production Examples 15 to 16) in which the elastic modulus of the insulating film was changed and other conditions were the same, in both groups D and E, the elastic modulus of the insulating film was increased, that is, As the ratio (R/H) of the elastic recovery force R to the shape retention force H increased, the spring back angle θ also increased. From this result, it is said that by adjusting the elastic modulus of the insulating film of the lead wire and making the ratio (R/H) of the elastic recovery force R to the shape retention force H 0.15 or less, it is possible to maintain a good bending restoration shape with a springback angle of 20° or less. is judged

In group F (Production Examples 17 to 20) in which the thickness of the strip-shaped conductor and the insulating film was constant and the elastic modulus was changed, the elastic recovery force R by an increase in the elastic modulus of the strip-shaped conductor, a decrease in the elastic modulus of the insulating film, or a combination thereof When the ratio (R/H) to the shape holding force H was reduced, the springback angle θ was reduced accordingly. From this result, it is said that by adjusting the elastic modulus of the insulating film of the lead wire and making the ratio (R/H) of the elastic recovery force R to the shape retention force H 0.15 or less, it is possible to maintain a good bending restoration shape with a springback angle of 20° or less. is judged

Further, as shown in FIG. 6 , the ratio (R/H) of the elastic recovery force R to the shape retention force H and the springback angle show a high correlation, and in particular, the ratio (R/H) is small (for example, 0.2 or less). ) showed a higher correlation in the production examples. Therefore, in reducing the springback angle, it can be confirmed that it is very effective to adjust the ratio R/H.

1, 11: Lead wire for electrical components
2, 7, 12: strip-shaped conductor
2A: one end
2B: the other end
3, 8, 13: insulating film
4: Lithium-ion battery
5A: positive
5B: cathode
6: Encapsulant
M: center plane of bending deformation

Claims (9)

A lead wire for electrical components comprising a strip-shaped conductor and a pair of insulating films covering both surfaces of the strip-shaped conductor, the lead wire comprising:
Secondary moment I _m in section per 1 mm in width of the strip-shaped conductor represented by the following formula (5) is 5.0×10 ^-15 m ⁴ /1 mm or more and 8.0×10 ^-13 m ⁴ /1 mm or less,
The cross-sectional secondary moment I _i per width 1 mm of the pair of insulating films represented by the following formula (6) is 1.0×10 ^-13 m ⁴ /1 mm or more and 8.0×10 ^-12 m ⁴ /1 mm or less,
The units of I _m and I _i are m ⁴ /1 mm.
Lead wire for electrical components.
_[ ^_ _{_ _} ^_ _{_} mm] … (5)
I _i [m ⁴ /1 mm] = 1/12 × 1 pair of insulating films average width W _i [m] × {(average thickness of lead wire for electrical parts T [m]) ³ - (average of strip-shaped conductors) Thickness T _m [m]) ³ }/1 average width W _i [mm] of the pair of insulating films . . . (6) The method of claim 1,
The bending recovery angle after 180° bending of the lead wire for electrical components is 20° or less
Lead wire for electrical components. 3. The method of claim 1 or 2,
The I _m is 2.0×10 ^-14 m ⁴ /1mm or more and 1.0×10 ^-13 m ⁴ /1mm or less
Lead wire for electrical components. 3. The method of claim 1 or 2,
wherein I _i is 5.0×10 ^-13 m ⁴ /1mm or more and 1.0×10 ^-12 m ⁴ /1mm or less
Lead wire for electrical components. 3. The method of claim 1 or 2,
The strip-shaped conductor has an average thickness of 30 µm or more and 200 µm or less.
Lead wire for electrical components. 3. The method of claim 1 or 2,
The average thickness of each insulating film is 25 μm or more and 200 μm or less.
Lead wire for electrical components. 3. The method of claim 1 or 2,
Each of the insulating films is laminated in multiple layers
Lead wire for electrical components. A lead wire for electric parts according to claim 1 or 2 is provided.
electrical parts. 9. The method of claim 8,
Non-aqueous electrolyte battery
electrical parts.

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