KR102469860B1 - Electrical component lead wire and electrical component - Google Patents

Abstract

A lead wire for electric 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, the elastic modulus of the strip-shaped conductor is D _m [Pa], the width is 1 The moment of inertia of area per mm is I _m [m ⁴ /1 mm], the average modulus of elasticity of the pair of insulating films is _Di [Pa], and the moment of inertia of area per mm of width is _I [m ⁴ /1 mm], the shape retention force H [N m 2 /1 mm] per width 1 mm of the strip-shaped conductor represented by the equation (1), the width of the insulating film represented by the equation (2) of 1 mm The ratio (R/H) of the sugar's elastic recovery force R [N·m 2 / 1 mm] is 0.15 or less.
H= _Dm × _Im . . . (One)
R=D _i ×I _i ... (2)

Description

Lead wire and electric components for electrical components {ELECTRICAL COMPONENT LEAD WIRE AND ELECTRICAL COMPONENT}

The present invention relates to a lead wire for electric parts and electric parts.

Along with the demand for miniaturization of electronic devices, the demand for miniaturization and weight reduction of batteries used as power sources is increasing. On the other hand, high energy density and high energy efficiency are also required for batteries. In order to satisfy these demands, expectations are rising for non-aqueous electrolyte batteries (for example, lithium ion batteries) in which electrodes, electrolytes, and the like are sealed inside a sealed body.

In such a non-aqueous electrolyte battery, it is common for lead wires to extend from the encapsulation body in order to take out current to the outside. As a lead wire, what consists only of a lead conductor made of metal, such as aluminum, and what covered the lead conductor with the insulating layer of a thermoplastic resin is known. Then, the lead wire is attached to the sealing body by, for example, heat sealing the open end in a state where the lead wire is sandwiched by the inner surface of the open end of the sealing body.

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

Japanese Unexamined Patent Publication No. 2001-102016 Japanese Unexamined Patent Publication No. 2009-259739

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

H= _Dm × _Im . . . (One)

R=D _i ×I _i ... (2)

An electric component according to one embodiment of the present invention includes the above electric component lead wire.

1 is a schematic perspective view showing an example of a lithium ion battery according to another embodiment of the present invention with parts thereof broken.
Fig. 2 is a schematic cross-sectional view taken along line AA in Fig. 1;
Fig. 3(a) is a schematic cross-sectional view viewed from the longitudinal direction for explaining the moment of inertia of a strip-shaped conductor and an insulating film in a 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 components of Fig. 3(a).
Fig. 3(c) is a schematic cross-sectional view showing only the insulating film of the lead wire for electric parts of Fig. 3(a).
Fig.4 (a) is a schematic plan view for demonstrating the lead wire used for evaluation of a springback angle.
Fig. 4(b) is a schematic cross-sectional view of the lead wire in Fig. 4(a).
Fig. 5 (a) is a schematic cross-sectional view for explaining one step of the springback angle evaluation method.
Fig. 5(b) is a schematic cross-sectional view for explaining a step following 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 retention force H per 1 mm width of the strip-shaped conductor. .

[Problems to be solved by the present disclosure]

The conventional non-aqueous electrolyte battery having a lead wire is often housed in an electronic device in a state where the lead wire is bent. Therefore, when manufacturing the electronic device, the lead wire provided in the non-aqueous electrolyte battery may be bent at a location where the lead conductor is covered with an insulating layer, and sent to a downstream process while maintaining the bent shape. Therefore, when it is assumed that a lead wire is bent and used, a lead wire that is resistant to spring back and can appropriately maintain a bent shape is required.

Here, the lead conductor is a metal such as aluminum, and is plastically deformed when bent, generating a force to maintain the bent shape. On the other hand, since the insulating layer is made of resin or the like, it is elastically deformed when bent, and a force to return from the bent shape to the original shape is generated. Among these two forces, when the force to return to the original shape from the bent shape due to the elastic deformation of the insulating layer is strong, the lead wire cannot maintain the bent shape and slightly returns to the original shape (spring hundred) occurs. However, since springback is a complex phenomenon caused by the interaction of two members of different materials, a metal lead conductor and a resin insulating layer, springback can be sufficiently suppressed by applying any member to the lead conductor and insulating layer. It is difficult to accurately predict whether there will be

An object of the present invention is to provide a lead wire for electrical components and an electrical component that are less prone to springback when used by bending and can appropriately maintain a bent shape.

[Effects of the Invention]

According to the above invention, it is possible to provide a lead wire for electrical components that is resistant to spring back during bending and can appropriately maintain a bent shape, and an electrical component with excellent work efficiency.

[Description of Embodiments of the 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 moment of inertia of area per mm of width is I _m [m ⁴ /1mm], and the average modulus of elasticity of the pair of insulating films is _Di [Pa], the moment of inertia of area per 1 mm of width In the case where I _i [m ⁴ /1 mm], in the following Equation (2) for the shape retention force H [N m 2 /1 mm] per 1 mm width of the strip-shaped conductor represented by the following Equation (1) The ratio (R/H) of the elastic restoring force R [N·m 2 / 1 mm] per 1 mm width of the shown insulating film is 0.15 or less.

H= _Dm × _Im . . . (One)

R=D _i ×I _i ... (2)

Here, the reason why springback occurs in the lead wire is, as described above, the force to return to the original shape from the bent shape caused by the elastic deformation of the insulating film rather than the force to maintain the bent shape due to the plastic deformation of the strip-shaped conductor. I think it's because the force is strong. Therefore, it is thought that if 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 reduced, springback is suppressed and the bending shape of the lead wire is easily maintained. Here, it is considered that whether or not the lead wire can maintain the bent shape, that is, the ease of occurrence of springback depends not only on the material of the strip-shaped conductor or insulating film, but also on their thickness and shape. Then, the inventors of the present invention and the like have determined the effect of the strip-shaped conductor of the lead wire for electric parts on spring back as a shape per 1 mm width represented by the above formula (1) in which the modulus of elasticity and moment of inertia of area per 1 mm width are parameters. I found that it can be judged by retention. In addition, the inventors of the present invention have determined the effect of the insulating film of the electric component lead wire on spring back as parameters of its modulus of elasticity and the moment of inertia of area per 1 mm of width. It was found that it can be judged by In addition, the inventors of the present invention have investigated the influence on the spring back by the insulating film and strip-shaped conductor of the lead wire for electric parts in relation to the shape-retaining force per 1 mm width of the strip-shaped conductor and the elastic restoring force per 1 mm width of a pair of insulating films. In relation to the ratio of , it was found that by setting the ratio to the above upper limit or less, it is difficult to cause springback when used bent, and the bent shape can be appropriately maintained.

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

Here, "average thickness" means the average value of the thickness measured at arbitrary 5 points|pieces. "Elasticity modulus" is the slope of the rise of the SS curve (stress-strain curve) when tensile deformation is applied to strip-shaped conductors and insulating films using a precision universal testing instrument (tensile testing machine; precision universal testing instrument) indicates In the measurement of this modulus of elasticity, the sample holding (chuck) interval of the tensile tester is set to 50 mm, and tension is performed at 50 mm/min. However, when measuring the modulus of elasticity of a strip-shaped conductor, in order to consider the influence of slip between the sample and the gripper of the testing machine, a strain gauge capable of measuring minute displacement is provided to the sample and measured. In addition, what is directly obtained from the measurement of this modulus of elasticity is the test force [N]-moving distance [mm] curve, but as shown in the following formulas (3) and (4), using the sample size and chuck spacing, the stress [Pa] ]-strain [%] curve to obtain the modulus of elasticity. In addition, even when the strip-shaped conductor and the insulating film have a multilayer structure, 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 value of each elastic modulus of the insulating film of 2 sheets. Hereinafter, in the case of "average thickness" or "elastic modulus", it is defined in the same way.

Stress [Pa] = test force [N] ÷ width [mm] ÷ thickness [mm] … (3)

Deformation [%] = Travel distance [mm] ÷ Chuck distance [mm] × 100 … (4)

It is good that the lead wire for electric parts concerned has a bending recovery angle of 20 degrees or less after being bent by 180 degrees. According to such a lead wire, since the bend recovery angle after being bent by 180°, that is, the springback angle is 20° or less, the bent shape can be maintained more appropriately, so the work of bending the lead wire and maintaining the shape becomes easier. Workability is further improved.

The elastic restoring 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 restoring 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 of the lead wire for electric parts becomes easier, and the workability is further improved.

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 shape-retaining force H is within the above range, the bent shape can be maintained more appropriately, so that the shape-retaining property capable of properly maintaining the bent shape can be imparted to the lead wire for electric parts. As a result, the bending operation of the lead wire for electric parts becomes easier, and the workability is further improved.

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 of the strip-shaped conductor can be set within an appropriate range, and the shape-retaining property capable of properly maintaining a bent shape can be imparted to the lead wire for electrical parts. As a result, the bending operation of the lead wire for electric parts becomes easier, and the workability is further improved.

The average thickness of each of the above insulating films is preferably 25 µm or more and 200 µm or less, and the modulus of elasticity of each of the above insulating films is preferably 100 MPa or more and 1,400 MPa or less. According to such a lead wire, the elastic restoring force of an insulating film can be made into an appropriate range, and the spring back after bending of the said lead wire for electrical components can be made small suitably. As a result, the bending work of the said lead wire for electric parts becomes easier, and workability|operativity improves more.

An electric component according to one embodiment of the present invention includes a lead wire for the electric component. Since the said electric component is equipped with the said electric component lead wire, it can improve work efficiency by being able to simplify the bending of the said electric component lead wire, and the work which maintains the shape.

The electrical component may be a non-aqueous electrolyte battery. In this way, since the electric component is excellent in working efficiency, it can be suitably used as a non-aqueous electrolyte battery.

[Details of Embodiments of the Invention]

EMBODIMENT OF THE INVENTION The specific example of the electric component lead wire and electric component which concerns on embodiment of this invention is demonstrated with reference to drawings. In addition, this invention is not limited to these examples, It is shown by the claim, and it is intended that the meaning of a claim and equality and all the changes within the range are included.

<Lead wire for electrical parts>

As shown in Figs. 1 and 2, the lead wire 1 for electric parts according to the embodiment of the present invention includes a strip conductor 2 and a pair of insulating films covering both surfaces of the strip conductor 2. (3) is provided.

(strip shape conductor)

The strip-shaped conductor 2 is connected to the electrodes (anode 5A and cathode 5B) of electric components such as the lithium ion battery 4 and the like. This strip-shaped conductor 2 is made of a highly conductive material. Examples of such highly conductive materials include metal materials such as aluminum, titanium, nickel, copper, aluminum alloys, titanium alloys, nickel alloys, and copper alloys, and materials obtained by plating these metal materials with nickel, gold, or the like. can As the material for forming the strip-shaped conductor 2 connected to the positive electrode 5A of electric parts such as the lithium ion battery 4, materials that do not dissolve during discharge, specifically aluminum, titanium, aluminum alloys and titanium alloys, are used. desirable. On the other hand, as a forming material of the strip-shaped conductor 2 connected to the negative electrode 5B, nickel, copper, nickel alloy, copper alloy, nickel-plated copper, and gold-plated copper are preferable. In addition, the strip-shaped conductor 2 may be subjected to surface treatment such as chromate treatment, trivalent chromium treatment, non-chromate treatment, and roughening treatment to improve electrolyte resistance and the like. By such surface treatment, the electrolytic solution resistance of the strip-shaped conductor 2 can be improved.

Strip-shaped conductor (2) represented by the following formula (1) when the modulus of elasticity of the strip-shaped conductor 2 is D _m [Pa] and the moment of inertia of area per 1 mm width is I _m [m ⁴ /1 mm] ), the lower limit of the shape retention force H [N m 2 / 1 mm] per 1 mm 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-retaining 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= _Dm × _Im . . . (One)

Since the strip-shaped conductor 2 can maintain the bent shape more appropriately when the shape-retaining force H is within the above range, the shape-retaining property capable of properly maintaining the bent shape can be imparted to the lead wire for electrical parts 1. can As a result, bending of the lead wire 1 for electric parts and the work of maintaining its shape become easier, and workability|operativity improves more.

Here, the cross-sectional moment of inertia per 1 mm width of the strip-shaped conductor 2 in the above formula (1) and the cross-sectional moment per 1 mm width of the pair of insulating films 3 in the later-described formula (2) About the calculation method, the lead wire 11 for electrical components of FIG. 3 (a) is demonstrated as an example. As for the lead wire 11 for electric 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. The average thickness of the lead wire 11 for electric parts is T, the average thickness of the strip-shaped conductor 12 is T _m [m], and the average thickness of each pair of insulating films 13 is T _i [m]. . Also, the average width of the strip-shaped conductor 12 is W _m [m], and the average width of the pair of insulating films 13 is W _i [m]. In addition, the plane that divides the lead wire 11 for electric parts into two in the thickness direction (the plane that divides the strip-shaped conductor 12 into two parts in the thickness direction) is regarded as the center plane M of the bending deformation of the lead wire for electric parts 11. 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 moment of section 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).

Moment of inertia of area per 1 mm of strip-shaped conductor width [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 of strip-shaped conductor W _m [mm] … (5)

Moment of inertia of area 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 of lead wires for electrical components T [m]) ³ - (average thickness of strip-shaped conductor T _m [m]) ³ }/average width of insulating film of one pair W _i [mm] . (6)

In addition, when the average thickness or average width of the pair of insulating films 3 of the lead wire 1 for electrical parts is not the same, the average value of each average thickness or average width of the pair of insulating films 3 is obtained , the above-described 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 elastic restoring force R are determined using the moment of inertia of area per 1 mm width of the strip-shaped conductor 2 and the pair of insulating films 3 obtained by this calculation.

The lower limit of the cross-sectional moment per 1 mm width of the strip-shaped conductor 2 is preferably 5.0 × 10 ^-15 m ⁴ /1 mm, and more preferably 2.0 × 10 ^-14 m ⁴ /1 mm. On the other hand, the upper limit of the moment of section is preferably 8.0 × 10 ^-13 m ⁴ /1 mm, and more preferably 1.0 × 10 ^-13 m ⁴ /1 mm. By setting the moment of section to be within the above range, the shape retaining force H per 1 mm 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 are more preferable, and 47 micrometers are still more preferable. On the other hand, as an upper limit of the average thickness of the strip-shaped conductor 2, 150 micrometers are more preferable, and 120 micrometers are still more preferable. When the average thickness of the strip-shaped conductor 2 is less than the lower limit, there is a possibility that the electrical resistance value of the lead wire 1 for electric components increases. Conversely, when the said average thickness exceeds the said upper limit, there exists a possibility that the lead wire 1 for electrical components may become unnecessarily thick and may not fully respond to the demand for thickness reduction.

As a modulus of elasticity of the strip-shaped conductor 2, 50 GPa or more and 300 GPa or less are preferable. As a lower limit of the modulus of elasticity of the strip-shaped conductor 2, 60 GPa is more preferable, and 67 GPa is still 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 still more preferable. When the modulus of elasticity of the strip-shaped conductor 2 is less than the lower limit, there is a possibility that it becomes difficult to suppress springback of the lead wire 1 for electric parts. Conversely, when the said elasticity modulus exceeds the said upper limit, there exists a possibility that workability|operativity may fall by requiring force for the bending work of the lead wire 1 for electrical components. Further, the modulus of elasticity of the strip-shaped conductor 2 can be adjusted by changing the material thereof, and in particular, by using an alloy for the strip-shaped conductor 2, the modulus of elasticity can be finely adjusted by changing the alloy components.

Further, since the strip-shaped conductor 2 has an average thickness of 30 μm or more and 200 μm or less, and an elastic modulus of 50 GPa or more and 300 GPa or less, the shape retention force H is set within a very suitable range, and the lead wire 1 for electric parts It is possible to impart shape-retaining properties capable of appropriately maintaining a bent shape. As a result, the shape fixing work at the time of bending of the lead wire 1 for electric parts becomes easier, and workability|operativity improves more.

(1 pair of insulating film)

The pair of insulating films 3 covers both sides of the central portion of the strip-shaped conductor 2 in a state where both ends of the strip-shaped conductor 2 are exposed, and for example, the lithium ion battery 4 and the like It is a part fixed to the encapsulation body 6 of the electric part.

Each insulating film 3 is formed of a highly insulating resin material. This resin material is preferably a resin material having high adhesion to the strip-shaped conductor 2 or a resin material that is difficult to melt by heating when heat-sealing the sealing body 6 .

As a resin material highly adhesive to the strip-shaped conductor 2, thermoplastic polyolefin etc. are mentioned, for example. As this thermoplastic polyolefin, for example, reactive resins such as polyethylene, acid modified polyethylene, polypropylene, acid modified polypropylene (eg maleic anhydride modified polypropylene), ionomer or the like; mixtures; and the like.

On the other hand, as a resin material that is difficult to melt by heating when heat-sealing the encapsulation body 6, crosslinked polyolefin etc. are mentioned, for example. As this crosslinked polyolefin, what crosslinked the polyolefin exemplified previously can be used. As a method of crosslinking polyolefin, crosslinking by irradiation of ionizing radiation such as electron beam or gamma ray, chemical crosslinking by peroxide or the like, silane crosslinking, or the like is used. When crosslinking polyolefin by ionizing radiation, a cross-linking assistant is added to the polyolefin as needed. As this crosslinking aid, for example, trimethylol propane methacrylate, pentaerythritol triacrylate, ethylene glycol dimethacrylate, triallyl cyanurate ( triallyl cyanurate), triallyl isocyanurate, and the like are used.

As a gel fraction in crosslinked polyolefin, 20% or more and 90% or less are preferable. In addition, the gel fraction is an index indicating the degree of crosslinking, and refers to the ratio of gels (undissolved 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 possibility that the insulating film 3 melts 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 or the like deteriorates.

In addition, each insulating film 3 may be a single layer or may be laminated in a plurality of layers. In the case where the insulating film 3 is configured as a plurality of layers, the insulating film 3 is formed of a resin material having high adhesiveness to the strip-shaped conductor 2 and the sealing body 6 when 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 having such a laminated structure is employed, adhesion to the strip-shaped conductor 2 can be ensured, and melting during heat sealing can be prevented.

When the average modulus of elasticity of a pair of insulating films 3 is Di [Pa] and the moment of inertia of area per _{1 mm of width is I i [} m ⁴ /1 mm], one pair represented by the following formula (2) The lower limit of the elastic restoring force R [N m 2 /1 mm] per 1 mm width of the insulating film 3 is preferably 3.0 × 10 ^-5 N m 2 /1 mm, and 1.0 × 10 ^-4 N m 2 / 1 mm is more preferable. On the other hand, the upper limit of the elastic restoring force R is preferably 6.0 × 10 ^-3 N·m 2 /1 mm, and more preferably 1.0 × 10 ^-3 N·m 2 /1 mm.

R=D _i ×I _i ... (2)

When the elastic restoring force per 1 mm of width of the pair of insulating films 3 is within the above range, spring back after bending of the lead wire 1 for electric components can be appropriately suppressed. As a result, the work of bending the lead wire 1 for electrical components and maintaining its shape becomes easier, and workability|operativity improves more. Further, the modulus of elasticity of the insulating film 3 can be adjusted by changing the material thereof, and when each insulating film 3 is formed of a crosslinked resin, the modulus of elasticity can be adjusted by changing the degree of crosslinking.

The lower limit of the moment of section per 1 mm of width of the pair of insulating films 3 is preferably 1.0 × 10 ^-13 m ⁴ /1 mm, more preferably 5.0 × 10 ^-13 m ⁴ /1 mm. On the other hand, the upper limit of the moment of section is preferably 8.0 × 10 ^-12 m ⁴ /1 mm, and more preferably 1.0 × 10 ^-12 m ⁴ /1 mm. By setting the moment of section to be within the above range, the elastic restoring force per 1 mm width of the pair of insulating films 3 can be easily and reliably adjusted within the above range.

As an average thickness of each insulating film 3, 25 micrometers or more and 200 micrometers or less are preferable for all. As a lower limit of the said average thickness, 40 micrometers are more preferable, and 60 micrometers are still more preferable. On the other hand, as an upper limit of the said average thickness, 120 micrometers are more preferable and 80 micrometers are still more preferable. When the average thickness of each insulating film 3 is less than the lower limit, the thickness of the insulating film 3 becomes too thin with respect to the thickness of the strip-shaped conductor 2, and as a result, the lead wire 1 for electrical parts is sealed. There is a risk of shorting between the strip-shaped conductor 2 and the sealing body 6 when heat-sealing to attach to (6). This risk of short circuit is particularly remarkable at the edge portion (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 spring-back 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 one side (the average thickness of the insulating film 3 on one side/the insulating film 3 on the other side) ) It is preferable that the average thickness of) is 0.95 or more and 1.05 or less. Further, the ratio of the modulus of elasticity of the insulating film 3 on the other side to the modulus of elasticity of the insulating film 3 on one side (the modulus of elasticity of the insulating film 3 on one side/the modulus of elasticity 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.

The lower limit of the ratio of the average thickness of each insulating film 3 to the average thickness of the strip-shaped conductors 2 (average thickness of the insulating film/average thickness of the strip-shaped conductor) is preferably 0.2, and 0.3 is preferred. It is more preferable, and 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. The elasticity of the pair of insulating films 3 with respect to the shape retention force of the strip-shaped conductor 2 by setting the ratio of the average thickness of each insulating film 3 to the average thickness of the strip-shaped conductor 2 to be within the above range. The ratio of the recovery force can be adjusted within an appropriate range, and as a result, it becomes possible to reduce the springback angle and maintain a desired bent shape.

The ratio of the moment of inertia of area per 1 mm of width of the pair of insulating films 3 to the moment of inertia of area per 1 mm of width of the strip-shaped conductor 2 (the moment of inertia of area per 1 mm of width of the pair of insulating films) As a lower limit of moment/inertial moment of cross section per 1 mm of strip-shaped conductor width), 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. By setting the ratio to be within the above range, the ratio of the elastic restoring force of the pair of insulating films 3 to the shape retaining 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 desired bending shape.

As a modulus of elasticity of each insulating film 3, all are preferably 100 MPa or more and 1,400 MPa or less. As a lower limit of the said elasticity modulus, 150 Mpa is more preferable and 200 Mpa is still more preferable. On the other hand, as an upper limit of the said elasticity modulus, 720 Mpa is more preferable and 350 Mpa is still more preferable. When the modulus of elasticity of the insulating film 3 falls within the above range, the elastic restoring force of the insulating film 3 can be appropriate.

In addition, each insulating film 3 has an average thickness of 25 μm or more and 200 μm or less, and all have an elastic modulus of 100 MPa or more and 1,400 MPa or less, so that the springback angle after bending the lead wire for electric parts 1 is appropriately small. can do. As a result, the work of bending the lead wire 1 for electric parts and maintaining the shape becomes easier, and workability|operativity improves more.

The lower limit of the ratio of the average modulus of elasticity of the pair of insulating films 3 to the modulus of elasticity of the strip-shaped conductor 2 (the average modulus of elasticity of the pair of insulating films 3/the modulus of elasticity of the strip-shaped conductor 2) is 1.0. ×10 ^-3 is preferred, and 2.0 ×10 ^-3 is more preferred. On the other hand, as an upper limit of the said ratio, 4.0x10 ^-2 is preferable ^and 1.5x10 ^-2 is more preferable. By setting the ratio to be within the above range, the ratio of the elastic restoring force of the pair of insulating films 3 to the shape retaining 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 desired bending shape.

In the lead wire for electrical parts 1, the ratio of the elastic restoring force R per 1 mm width of the pair of insulating films 3 to the shape retention force H per 1 mm width 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 such a lead wire 1 for electrical parts, since the bent shape can be maintained more appropriately by setting the bend restoration angle (springback angle) after 180° bending to 20° or less, the shape fixing work at the time of bending is easier. and workability is further improved. In addition, the bending recovery angle is as good as it is small, more preferably 12° or less, more preferably 5° or less, and most preferably 0°.

<Electrical parts>

An electrical component according to an embodiment of the present invention includes a lead wire 1 for electrical components. Examples of the electric parts for which the lead wire for electric parts 1 is used include non-aqueous electrolyte batteries such as lithium ion batteries, capacitors such as lithium ion capacitors and electric double-layer capacitors (EDLC). have. Of course, the lead wire 1 for electric parts can be applied to all electric parts requiring a lead wire, and the same effect can be obtained even when applied to batteries other than non-aqueous electrolyte batteries.

Hereinafter, a non-aqueous electrolyte battery provided with lead wires 1 for electric parts will be described, taking a lithium ion battery as an example and referring to the drawings.

(Lithium ion battery)

The lithium ion battery 4 shown in FIGS. 1 and 2 encapsulates a battery element holding a non-aqueous electrolyte inside a sealed body 6 . The battery element retains a non-aqueous electrolyte solution in a state where a separator (not shown) is interposed between the positive electrode 5A and the negative electrode 5B. As the non-aqueous electrolyte, for example, one obtained by dissolving a lithium compound (LiClO ₄ , LiBF ₄ , etc.) in an organic solvent such as propylene carbonate or γ-butyrolactone is used.

The lead wire 1 for electric parts is fixed to the sealing body 6 by the insulating film 3. In the lead wire 1 for electrical parts, one end 2A and the other end 2B of the strip-shaped conductor 2 are exposed from the insulating film 3, and the strip-shaped conductor 2 is exposed One end 2A is electrically connected to the positive electrode 5A or negative electrode 5B of the battery element, and the other exposed end 2B of the strip-shaped conductor 2 is removed from the encapsulation body 6. is protruding

Since such a lithium ion battery 4 is provided with a lead wire 1 for electric parts, it is possible to simplify the work of bending the lead wire 1 for electric parts and maintaining its shape, thereby improving work efficiency. can

Moreover, even if 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 bent shape.

(Example)

Next, the present invention will be specifically described by means of experimental examples, but the present invention is not limited by the following experimental examples, and it is possible to carry out the present invention with appropriate changes within the range suitable for the purpose of the present invention, all of which are the present invention. is 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 covering the central portion of the strip-shaped conductor with a pair of insulating films so that both ends of the strip-shaped conductor were exposed. As shown in FIG. 4(a) and FIG. 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 average thickness T _m are shown in Table 1 below. The values indicated were used. As the insulating film 8, the length L _i was 6 mm, the width W _i was 7 mm, and the elastic modulus and the average thickness T _i were values shown in Table 1 below. In addition, the same thing was used for the insulating film 8 of 2 sheets. The total average thickness of the strip-shaped conductor 7 and the pair of insulating films 8 was defined as the average thickness T of the lead wire.

<Inertial Moment of Area>

The moment of inertia [m ⁴ /1 mm] per 1 mm width of the strip-shaped conductor 7 is 1/12 × W _m [m] × (T _m [m]) ³ / W _m [mm] was obtained by substituting The moment of inertia [m ⁴ /1mm] of a pair of insulating films 8 is 1/12×W _i [m]×{(T [m]) ³ -(T _m [m]) ³ }/ W _i [mm] was obtained by substituting each numerical value.

<Evaluation of spring back angle>

The spring back angle was evaluated as follows. First, as shown in Fig. 5(a), the end face of a plate material X having a thickness of 0.5 mm is brought into contact near the center in the longitudinal direction of the insulation 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, a load F was applied by placing a weight of 200 g on the other insulating film 8, and this state was maintained for 10 seconds. Next, as shown in Fig. 5(b), evaluation was performed by measuring the springback angle θ [deg] (angle formed by the lead wire) when the load was removed and left unattended for 5 seconds or longer. The measurement results of the spring back angle are shown in Table 1 below. 6 shows the relationship between the spring back angle θ and the ratio (R/H) of the elastic restoring force R per 1 mm width of a pair of insulating films to the shape retention force H per 1 mm width of the strip-shaped conductor. 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 all groups, the springback angle θ also decreased as the average thickness T1 of the strip-shaped conductor increased, that is, the ratio of the elastic restoring force R to the shape retaining force H decreased (R/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 increase in the thickness T2 of the insulating film, 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 of the elastic restoring force R to the shape retention force H (R/H) was set to 0.15 or less, resulting in a springback angle of 20° or less. It is judged that it becomes possible to maintain the bending restoration shape.

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

In group F (Production Examples 17 to 20) in which the thickness of the strip-shaped conductor and the insulating film were kept constant and the modulus of elasticity was changed, the elastic recovery force R was obtained by increasing the modulus of elasticity of the strip-shaped conductor, decreasing the modulus of elasticity of the insulating film, or a combination thereof. When the ratio (R/H) to the shape-retaining force H of was reduced, the spring-back angle θ was reduced accordingly. From this result, it was found that by adjusting the modulus of elasticity of the insulating film of the lead wire and setting the ratio (R/H) of the elastic restoring force R to the shape retaining force H to 0.15 or less, it is possible to maintain a good bending recovery shape with a springback angle of 20° or less. judged

Further, as shown in Fig. 6, the ratio of the elastic restoring force R to the shape retaining force H (R/H) and the springback angle show a high correlation, and in particular, the ratio (R/H) is small (for example, 0.2 or less). ) In Production Example, a higher correlation was shown. Therefore, it can be confirmed that adjusting the ratio (R/H) is very effective in reducing the springback angle.

1, 11: lead wire for electrical parts
2, 7, 12: strip-shaped conductor
2A: one end
2B: other end
3, 8, 13: insulating film
4: Li-ion battery
5A: anode
5B: cathode
6: encapsulation body
M: center plane of bending deformation

Claims (9)

A lead wire for electric components comprising a strip-shaped conductor and a pair of insulating films covering both surfaces of the strip-shaped conductor, comprising:
The cross-sectional moment of inertia I _m per 1 mm width of the strip-shaped conductor represented by Equation (5) below is 5.0 × 10 ^-15 m ⁴ /1 mm or more and 8.0 × 10 ^-13 m ⁴ /1 mm or less,
The moment of inertia of area I _i per 1 mm width 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,
The ratio of the average modulus of elasticity of the pair of insulating films to the modulus of elasticity of the strip-shaped conductor is 1.0×10 ^-3 or more and 4.0×10 ^-2 or less.
Lead wire for electrical components.
I _m [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 of strip-shaped conductor W _m [ mm] … (5)
I _i [m ⁴ /1 mm] = 1/12 × Average width of 1 pair of insulating films W _i [m] × {(Average thickness of lead wire for electrical parts T [m]) ³ - (Average of strip-shaped conductors Thickness T _m [m]) Average width W _i [mm] of ³ }/1 pair of insulating films... (6) According to claim 1,
The bending recovery angle after 180 ° bending of the lead wire for electric parts is 20 ° or less
Lead wire for electrical components. According to claim 1 or 2,
The above I _m is 2.0 × 10 ^-14 m ⁴ / 1 mm or more and 1.0 × 10 ^-13 m ⁴ / 1 mm or less
Lead wire for electrical components. According to claim 1 or 2,
The above I _i is 5.0 × 10 ^-13 m ⁴ / 1 mm or more and 1.0 × 10 ^-12 m ⁴ / 1 mm or less
Lead wire for electrical components. According to claim 1 or 2,
The average thickness of the strip-shaped conductor is 30 μm or more and 200 μm or less
Lead wire for electrical components. According to claim 1 or 2,
The average thickness of each of the insulating films is 25 μm or more and 200 μm or less.
Lead wire for electrical components. According to claim 1 or 2,
Each of the insulating films is laminated in multiple layers.
Lead wire for electrical components. Equipped with a lead wire for electric parts according to claim 1 or claim 2
electrical parts. According to claim 8,
Non-aqueous electrolyte battery
electrical parts.

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