CN112310571A - Lead wire for electrical component and electrical component - Google Patents
Lead wire for electrical component and electrical component Download PDFInfo
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- CN112310571A CN112310571A CN202011202219.1A CN202011202219A CN112310571A CN 112310571 A CN112310571 A CN 112310571A CN 202011202219 A CN202011202219 A CN 202011202219A CN 112310571 A CN112310571 A CN 112310571A
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- electrical component
- lead
- short strip
- width
- strip conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
A lead for an electrical component according to an embodiment of the present invention includes a short strip conductor and a pair of insulating films covering both surfaces of the short strip conductor, where D represents an elastic modulus of the short strip conductorm[Pa]Every 1mm widthSecond moment of cross section is set as Im[m4/1mm]And D represents an average elastic modulus of the pair of insulating filmsi[Pa]The second moment of the cross section per 1mm width is set as Ii[m4/1mm]In the case of (1), the elastic restoring force R [ N · m ] per 1mm width of the insulating film represented by the formula (2)2/1mm]Shape retention per 1mm width of the short strip conductor expressed by equation (1)2/1mm]The ratio R/H is less than or equal to 0.15, H ═ Dm×Im···(1)R＝Di×Ii···(2)。
Description
This application is a divisional application based on the chinese national application No. 201780003233.9 (electrical component lead and electrical component) filed on 7/2017, and the contents thereof are incorporated below.
Technical Field
The present invention relates to a lead wire for an electrical component and an electrical component.
Background
Along with the demand for downsizing of electronic devices, there is a strong demand for downsizing and weight reduction of batteries used as power sources thereof. On the other hand, high energy density and high energy efficiency are also required for batteries. In order to meet such a demand, nonaqueous electrolyte batteries (for example, lithium ion batteries) in which electrodes, an electrolytic solution, and the like are sealed inside a bag have been increasingly expected.
In the nonaqueous electrolyte battery as described above, in order to draw out an electric current to the outside, a lead wire is generally extended from the pouch body. As the lead, in addition to a lead composed of only a lead conductor made of metal such as aluminum, a lead in which a lead conductor is covered with an insulating layer of thermoplastic resin is known. The opening end of the bag body is heat-sealed with the lead wire sandwiched between the inner surfaces thereof, for example, so that the lead wire is attached to the bag body.
In the method of attaching the lead conductors to the bag body by heat sealing as described above, the insulating layer may be melted by heat at the time of heat sealing, and the lead conductors may be short-circuited to the metal layer of the bag body. Therefore, it has been proposed that melting of the insulating layer can be avoided by providing the insulating layer with a crosslinked layer composed of a crosslinked polyolefin (see, for example, patent documents 1 and 2).
Patent document 1: japanese patent laid-open No. 2001 and 102016
Patent document 2: japanese laid-open patent publication No. 2009-259739
Disclosure of Invention
A lead for an electrical component according to one aspect of the present invention includes a short strip conductor and a pair of insulating films covering both surfaces of the short strip conductor, and in the lead for an electrical component, the elastic modulus of the short strip conductor is Dm[Pa]The second moment of the cross section per 1mm width is set as Im[m4/1mm]And D represents an average elastic modulus of the pair of insulating filmsi[Pa]The second moment of the cross section per 1mm width is set as Ii[m4/1mm]In the case of (1), the elastic restoring force R [ N · m ] per 1mm width of the insulating film represented by the following formula (2)2/1mm]A shape retention force H [ N.m ] per 1mm width of the short strip conductor expressed by the following formula (1)2/1mm]A ratio (R/H) of less than or equal to 0.15,
H＝Dm×Im…(1)
R＝Di×Ii…(2)。
an electrical component according to one embodiment of the present invention includes the electrical component lead.
Drawings
Fig. 1 is a schematic perspective view partially cut away to illustrate an example of a lithium ion battery according to another embodiment of the present invention.
Fig. 2 is a schematic sectional view taken along line a-a of fig. 1.
Fig. 3A is a schematic cross-sectional view of the short strip conductor and the insulating film in the lead wire for an electrical component according to one embodiment of the present invention, as viewed from the longitudinal direction.
Fig. 3B is a schematic cross-sectional view of only a short strip conductor of the lead wire for an electrical component of fig. 3A.
Fig. 3C is a schematic cross-sectional view showing only an insulating film of the electrical component lead of fig. 3A.
Fig. 4A is a schematic plan view for explaining a lead wire used in the evaluation of the spring back angle.
Fig. 4B is a schematic cross-sectional view of the lead of fig. 4A.
Fig. 5A is a schematic cross-sectional view for explaining one step of the method for evaluating the springback angle.
Fig. 5B is a schematic cross-sectional view for explaining the next process of fig. 5A.
Fig. 6 is a graph showing the relationship between the measurement result of the spring back angle and the ratio (R/H) of the elastic restoring force R per 1mm width of the pair of insulating films to the shape retaining force H per 1mm width of the short strip conductor.
Detailed Description
[ problems to be solved by the present disclosure ]
The nonaqueous electrolyte battery having the conventional lead wire is often housed in an electronic device in a state where the lead wire is bent. Therefore, in the manufacture of the electronic device, the lead wire included in the nonaqueous electrolyte battery may be bent at a portion where the lead conductor is covered with the insulating layer, and may be sent to a downstream process while maintaining the bent shape. Therefore, when the lead is assumed to be used for bending, a lead that is less likely to cause springback and can appropriately maintain a bent shape is desired.
Here, the lead conductor is made of metal such as aluminum, and is plastically deformed when it is bent, thereby generating a force that attempts 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 being bent, and a force trying to return from the bent shape to the original shape is generated. If a force trying to return from the bent shape to the original shape due to elastic deformation of the insulating layer among the 2 forces acts more strongly, a phenomenon (springback) occurs in which the lead cannot maintain the bent shape and slightly returns to the original shape. However, since springback is a complicated phenomenon caused by the interaction of 2 members made of different materials, such as a metal lead conductor and a resin insulating layer, it is difficult to accurately predict which member is applied to the lead conductor and the insulating layer, and thus springback can be sufficiently suppressed.
The invention aims to provide a lead for an electrical component and the electrical component, wherein the lead is not easy to generate springback when being bent and used, and the bent shape can be properly maintained.
[ Effect of the invention ]
According to the present invention, it is possible to provide a lead wire for an electrical component, which is less likely to cause springback when used in bending and can maintain a bent shape appropriately, and an electrical component having excellent work efficiency.
[ description of embodiments of the invention ]
In an electrical component lead according to one aspect of the present invention, the electrical component lead includes a short strip conductor and a pair of insulating films covering both surfaces of the short strip conductor, and the elastic modulus of the short strip conductor is Dm [ Pa ]]The second moment of the cross section per 1mm width is set as Im[m4/1mm]And D represents an average elastic modulus of the pair of insulating filmsi[Pa]The second moment of the cross section per 1mm width is set as Ii[m4/1mm]In the case of (1), the elastic restoring force R [ N · m ] per 1mm width of the insulating film represented by the following formula (2)2/1mm]A shape retention force H [ N.m ] per 1mm width of the short strip conductor expressed by the following formula (1)2/1mm]A ratio (R/H) of less than or equal to 0.15,
H＝Dm×Im…(1)
R＝Di×Ii…(2)。
here, the cause of occurrence of springback in the lead is considered to be that, as described above, the force trying to return from the bent shape to the original shape due to elastic deformation of the insulating film acts more strongly than the force trying to maintain the bent shape due to plastic deformation of the short strip conductor. Therefore, if the force due to the plastic deformation of the short strip conductor is increased and the force due to the elastic deformation of the insulating film is decreased, it is considered that the spring back is suppressed and the bent shape of the lead is easily maintained. Here, whether or not the lead can maintain the bent shape, that is, the easiness of occurrence of springback, is considered to depend not only on the materials of the short strip conductor and the insulating film but also on the thickness and shape thereof. Therefore, the present inventors have found that the influence of the short strip-shaped conductor of the lead for an electrical component on springback can be determined by the shape retention per 1mm width represented by the above equation (1) in which the elastic modulus and the second moment in cross section per 1mm width of the short strip-shaped conductor of the lead for an electrical component are taken as parameters. The present inventors have also found that the influence of the insulating film of the lead for an electrical component on springback can be determined by the elastic restoring force per 1mm width expressed by the above equation (2) in which the elastic modulus of the insulating film of the lead for an electrical component and the second moment in cross section per 1mm width are used as parameters. The present inventors have also found that, by relating the influence on springback caused by the insulating film and the short strip conductor of the electrical component lead to the ratio of the elastic restoring force per 1mm width of the pair of insulating films to the shape retaining force per 1mm width of the short strip conductor, and setting the ratio to be equal to or less than the above upper limit, springback is less likely to occur during use in bending, and the bent shape can be appropriately maintained.
As described above, in the lead for an electrical component, the ratio of the elastic restoring force per 1mm width of the pair of insulating films to the shape retaining force per 1mm width of the short strip conductor is set to be less than or equal to the upper limit, so that springback is less likely to occur, and the bent shape can be appropriately maintained. Therefore, when the lead is bent for use, the bent shape is easily maintained, and therefore, it is not necessary to fix the bent lead to another element using a fixing tape or the like after the lead is bent. As a result, the lead for an electrical component can simplify the manufacturing process when used by bending, and can contribute to space saving by using by bending.
Here, the "average thickness" refers to an average value of thicknesses measured at arbitrary 5 points. The "elastic modulus" is a slope of an SS curve (stress-strain curve) when a tensile deformation is applied to a short strip conductor and an insulating film using a precision universal tester (tensile tester). In the measurement of the elastic modulus, the sample holding (chuck) interval of the tensile tester was set to 50mm, and the tensile was performed at 50 mm/min. However, in the measurement of the elastic modulus of the short strip conductor, a strain gauge capable of measuring a minute displacement is attached to the sample and the measurement is performed in consideration of the influence of the sliding between the sample and the jig of the testing machine. The elastic modulus was determined directly from the measurement of the test force [ N ] -moving distance [ mm ] curve, but as shown in the following equations (3) and (4), the elastic modulus was determined by converting the test force [ N ] -moving distance [ mm ] curve into a stress [ Pa ] -strain [% ] curve using the sample size and the chuck spacing. In addition, the elastic modulus can be obtained by the above-described method even when the short strip conductor and the insulating film are a multilayer structure. The "average elastic modulus of a pair of insulating films" is an average of measured values of elastic moduli of 2 insulating films. Hereinafter, the same definition is applied to the "average thickness" or the "elastic modulus".
Stress [ Pa ] ═ test force [ N ]/width [ mm ]/thickness [ mm ]/[ … (3) strain [% ] -displacement distance [ mm ]/[ chuck spacing [ mm ] × 100 … (4)
The lead for an electrical component may have a bend recovery angle after being bent by 180 ° of 20 ° or less. According to the lead wire as described above, the bent shape can be maintained more appropriately by the bend return angle after bending at 180 °, that is, the spring back angle, being 20 ° or less, and therefore, the work of bending the lead wire to maintain the shape thereof becomes easier, and the workability improves.
The elastic restoring force R is preferably 3.0X 10 or more－5N·m2A thickness of 1mm to 6.0X 10－3N·m2A thickness of 1 mm. According to the lead wire as described above, the elastic restoring force R is in the above range, whereby the spring back after bending of the lead wire for an electrical component can be appropriately reduced. As a result, the lead wire for electric partsThe bending operation becomes easier, and the workability is further improved.
The shape retention force H is preferably 3.0X 10 or more－4N·m2A thickness of 1mm to 6.0X 10－2N·m2A thickness of 1 mm. According to the lead wire as described above, since the shape retaining force H is in the above range, the bent shape can be more appropriately maintained, and therefore, the lead wire for an electrical component can have shape retaining properties capable of appropriately maintaining the bent shape. As a result, the bending work of the lead for electric components is facilitated, and the workability is further improved.
The average thickness of the short strip conductor is preferably 30 μm or more and 200 μm or less, and the elastic modulus of the short strip conductor is preferably 50GPa or more and 300GPa or less. According to the lead wire described above, the shape retention force of the short strip conductor can be set to an appropriate range, and the lead wire for an electrical component has shape retention properties capable of appropriately maintaining the bent shape. As a result, the bending work of the lead for electric components is facilitated, and the workability is further improved.
The average thickness of each of the insulating films is preferably not less than 25 μm and not more than 200 μm, and the elastic modulus of each of the insulating films is preferably not less than 100MPa and not more than 1400 MPa. According to the lead wire as described above, the elastic restoring force of the insulating film can be set to an appropriate range, and the spring back after bending of the lead wire for an electrical component can be appropriately reduced. As a result, the bending work of the lead for electric components is facilitated, and the workability is further improved.
An electrical component according to one embodiment of the present invention includes the electrical component lead. Since the electric component has the electric component lead wire, the work of bending the electric component lead wire and maintaining the shape thereof can be simplified, and the work efficiency can be improved.
The electrical component may be a nonaqueous electrolyte battery. As described above, the electrical component is excellent in work efficiency and therefore can be suitably used as a nonaqueous electrolyte battery.
[ details of embodiments of the present invention ]
Specific examples of the lead for an electrical component and the electrical component according to the embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to these examples, but is defined by the claims, and includes all modifications within the meaning and range equivalent to the claims.
< lead wire for electric component >
As shown in fig. 1 and 2, a lead 1 for an electrical component according to an embodiment of the present invention includes a short strip conductor 2 and a pair of insulating films 3 covering both surfaces of the short strip conductor 2.
(short strip conductor)
The short strip conductor 2 is connected to electrodes (a positive electrode 5A and a negative electrode 5B) of electrical components such as the lithium ion battery 4. The short strip conductor 2 is formed of a material having high conductivity. Examples of the material having high conductivity 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, and the like. The material for forming the short strip conductor 2 connected to the positive electrode 5A of the electrical component such as the lithium ion battery 4 is preferably a material that does not dissolve during discharge, specifically, aluminum, titanium, an aluminum alloy, and a titanium alloy. On the other hand, as a material for forming the short strip conductor 2 connected to the negative electrode 5B, nickel, copper, a nickel alloy, a copper alloy, nickel-plated copper, and gold-plated copper are preferable. The short strip-shaped conductor 2 may be subjected to surface treatment such as chromate treatment, trivalent chromium treatment, non-chromate treatment, or roughening treatment in order to improve the electrolyte resistance. The electrolytic solution resistance of the short strip conductor 2 can be improved by the surface treatment as described above.
The elastic modulus of the short strip conductor 2 is set as Dm[Pa]The second moment of the cross section per 1mm width is set as Im[m4/1mm]In the case of (1), the shape retention H [ N.m ] per 1mm width of the short strip conductor 2 represented by the following formula2/1mm]The lower limit of (3) is preferably 3.0X 10－4N·m21mm, more preferably 2.0X 10－3N·m2/1mm。The upper limit value of the shape retaining force H is preferably 6.0X 10－2N·m21mm, more preferably 1.0X 10－2N·m2/1mm。
H＝Dm×Im…(1)
Since the shape retaining force H is in the above range with respect to the short strip conductor 2, the bent shape can be more appropriately maintained, and therefore, the lead 1 for an electrical component can have shape retaining properties with which the bent shape can be appropriately maintained. As a result, the operation of bending and maintaining the shape of the lead 1 for the electric component is facilitated, and the workability is further improved.
Here, the method of calculating the second moment of the cross section per 1mm width of the short strip conductor 2 in the above expression (1) and the second moment of the cross section per 1mm width of the pair of insulating films 3 in the expression (2) described later will be described by taking the lead 11 for an electrical component in fig. 3A as an example. The pair of insulating films 13 of the lead 11 for an electrical component shown in fig. 3A have the same average thickness and the same average width. The average thickness of the lead 11 for the electric component is denoted by T, and the average thickness of the short strip-shaped conductor 12 is denoted by Tm[m]Let the average thickness of the pair of insulating films 13 be Ti[m]. Further, the average width of the short strip-shaped conductor 12 is Wm[m]W represents the average width of the pair of insulating films 13i[m]. Further, a plane obtained by equally dividing the electrical component lead wire 11 into 2 parts in the thickness direction (a plane obtained by equally dividing the short strip-shaped conductor 12 into 2 parts in the thickness direction) can be regarded as the center plane M of the bending deformation of the electrical component lead wire 11.
Next, the sectional moment of the short strip-shaped conductor 12 can be calculated by the following equation (5) based on the sectional shape shown in fig. 3B. Similarly, the sectional moments of the pair of insulating films 13 can be calculated by the following equation (6) based on the sectional shape shown in fig. 3C.
Second moment [ m ] of the cross section of each 1mm width of the short strip conductor4/1mm]1/12 x average width W of short strip conductorm[m]X (average thickness T of short strip conductor)m[m])3Average width W of short strip conductorm[mm]…(5)
A pair of insulatorsSecond moment [ m ] of cross section per 1mm width of film4/1mm]1/12 x average width W of a pair of insulating filmsi[m]X { (average thickness T [ m ] of lead wire for electric component])3Average thickness T of (short strip conductors)m[m])3}/average width W of a pair of insulating filmsi[mm]…(6)
When the average thickness or the average width of the pair of insulating films 3 of the lead 1 for an electrical component is different from each other, the average thickness or the average width of the pair of insulating films 3 is obtained, and the calculation is performed assuming that the average thickness or the average width of the pair of insulating films 3 is the average value. Then, the shape retention force H and the elastic restoring force R are determined using the second moment of the cross section per 1mm width of the short strip conductor 2 and the pair of insulating films 3 obtained by the calculation.
As the lower limit value of the cross-sectional moment per 1mm width of the short strip-like conductor 2, 5.0X 10 is preferable－15m41mm, more preferably 2.0X 10－14m4A thickness of 1 mm. On the other hand, the upper limit of the cross-sectional moment is preferably 8.0 × 10－13m41mm, more preferably 1.0X 10－13m4A thickness of 1 mm. The sectional moment is in the above range, whereby the shape retaining force H per 1mm width of the short strip-shaped conductor 2 can be easily and reliably adjusted to the above range.
The average thickness of the short strip conductor 2 is preferably 30 μm or more and 200 μm or less. The lower limit of the average thickness of the short strip conductor 2 is more preferably 40 μm, and still more preferably 47 μm. On the other hand, the upper limit of the average thickness of the short strip conductor 2 is more preferably 150 μm, and still more preferably 120 μm. When the average thickness of the short strip conductor 2 is less than the lower limit, the resistance value of the lead 1 for electrical components may increase. Conversely, if the average thickness exceeds the upper limit, the lead 1 for the electrical component becomes unnecessarily thick, and there is a possibility that the demand for thinning cannot be sufficiently met.
The elastic modulus of the short strip conductor 2 is preferably 50GPa or more and 300GPa or less. The lower limit value of the elastic modulus of the short strip conductor 2 is more preferably 60GPa, and still more preferably 67 GPa. On the other hand, the upper limit value of the elastic modulus of the short strip conductor 2 is more preferably 250GPa, and still more preferably 210 GPa. When the elastic modulus of the short strip conductor 2 is less than the lower limit, it may be difficult to suppress springback of the lead wire 1 for electrical components. Conversely, if the elastic modulus exceeds the upper limit, a force may be required for bending the lead 1 for an electrical component, and workability may be reduced. The elastic modulus of the short strip conductor 2 can be adjusted by changing the material thereof, and particularly, by making the short strip conductor 2 of an alloy, the elastic modulus can be finely adjusted by changing the alloy composition.
Further, the average thickness of the short strip-shaped conductor 2 is 30 μm or more and 200 μm or less, and the elastic modulus is 50GPa or more and 300GPa or less, whereby the shape retaining force H can be set to an appropriate range, and the lead 1 for an electrical component can have shape retaining properties for appropriately maintaining the bent shape. As a result, the shape fixing work when the lead 1 for the electric component is bent becomes easier, and the workability is further improved.
(a pair of insulating films)
The pair of insulating films 3 cover both surfaces of the center portion of the short strip conductor 2 in a state where both end portions of the short strip conductor 2 are exposed, and are portions to be fixed to a bag body 6 of an electrical component such as a lithium ion battery 4, for example.
Each insulating film 3 is formed of a resin material having high insulation properties. The resin material is preferably a resin material having high adhesiveness to the short strip conductors 2 or a resin material that is not easily melted by heating at the time of heat-sealing the bag body 6.
Examples of the resin material having high adhesiveness to the short strip conductor 2 include thermoplastic polyolefin. Examples of the thermoplastic polyolefin include reactive resins such as polyethylene, acid-modified polyethylene, polypropylene, acid-modified polypropylene (e.g., maleic anhydride-modified polypropylene), ionomer, and mixtures thereof.
On the other hand, examples of the resin material that is not easily melted by heating at the time of heat-sealing the bag body 6 include crosslinked polyolefin. As the crosslinked polyolefin, the material obtained by crosslinking the polyolefin described in the above example can be used. As a method for crosslinking the polyolefin, crosslinking by irradiation with ionizing radiation such as electron beam or gamma ray, chemical crosslinking with peroxide or the like, silane crosslinking, or the like is used. In the case where the polyolefin is crosslinked by ionizing radiation, a crosslinking assistant is added to the polyolefin as necessary. Examples of the crosslinking aid include Trimethylolpropane trimethacrylate (trimethyolpropane trimethacrylate), Pentaerythritol triacrylate (Pentaerythritol triacrylate), Ethylene Glycol Dimethacrylate (Ethylene Glycol Dimethacrylate), Triallyl cyanurate (Triallyl isocyanurate), Triallyl isocyanurate (Triallyl isocyanurate), and the like.
The gel fraction in the crosslinked polyolefin is preferably 20% or more and 90% or less. The gel fraction is an index indicating the degree of crosslinking, and is the proportion of gel (insoluble polymer chain) in the crosslinked polyolefin insoluble in a solvent such as xylene. When the gel fraction is less than 20%, the degree of crosslinking is insufficient, and there is a possibility that the insulating film 3 melts at the time of heat sealing. Conversely, if the gel fraction exceeds 90%, the degree of crosslinking becomes too large, and there is a possibility that the adhesiveness between the crosslinked polyolefin and the bag body 6 or the like is deteriorated.
Each insulating film 3 may be a single layer or a plurality of layers. When the insulating film 3 is formed in a multilayer structure, the insulating film 3 preferably includes an insulating layer made of a resin material having high adhesiveness to the short strip conductors 2 and an insulating layer made of a resin material that is not easily melted by heating at the time of heat-sealing the bag 6. When the insulating film 3 having the above-described laminated structure is used, the adhesiveness to the short strip conductor 2 can be secured, and the melting at the time of heat sealing can be prevented.
D represents the average elastic modulus of the pair of insulating films 3i[Pa]The second moment of the cross section per 1mm width is set as Ii[m4/1mm]In the case of (1), the elastic restoring force R [ N · m ] per 1mm width of the pair of insulating films 3 represented by the following formula (2)2/1mm]The lower limit value of (a) is,preferably 3.0X 10－5N·m21mm, more preferably 1.0X 10－4N·m2A thickness of 1 mm. On the other hand, the upper limit value of the elastic restoring force R is preferably 6.0X 10－3N·m21mm, more preferably 1.0X 10－3N·m2/1mm。
R＝Di×Ii…(2)
The elastic restoring force per 1mm width of the pair of insulating films 3 is in the above range, whereby springback after bending of the lead 1 for an electrical component can be appropriately suppressed. As a result, the operation of bending the lead 1 for an electrical component to maintain its shape is facilitated, and the workability is further improved. The elastic modulus 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 elastic modulus can be adjusted by changing the degree of crosslinking.
The lower limit of the cross-sectional moment per 1mm width of the pair of insulating films 3 is preferably 1.0 × 10－13m41mm, more preferably 5.0X 10－13m4A thickness of 1 mm. On the other hand, the upper limit of the cross-sectional moment is preferably 8.0 × 10－12m41mm, more preferably 1.0X 10－12m4A thickness of 1 mm. The cross-sectional moment is in the above range, whereby the elastic restoring force per 1mm width of the pair of insulating films 3 can be easily and reliably adjusted to the above range.
The average thickness of each insulating film 3 is preferably not less than 25 μm and not more than 200 μm. The lower limit of the average thickness is more preferably 40 μm, and still more preferably 60 μm. On the other hand, the upper limit of the average thickness is more preferably 120 μm, and still more preferably 80 μm. When the average thickness of each insulating film 3 is smaller than the lower limit value, the thickness of the insulating film 3 becomes too small compared to the thickness of the strip-shaped conductors 2, and as a result, when the heat sealing is performed to attach the electrical component lead 1 to the bag 6, there is a possibility that a short circuit may occur between the strip-shaped conductors 2 and the bag 6. The possibility of this short circuit is particularly significant at the edge portions (both ends in the width direction) of the short strip conductors 2. Conversely, when the average thickness exceeds the upper limit, the spring back of the lead 1 for electrical components may not be sufficiently suppressed.
The average thickness and the elastic modulus of each insulating film 3 are preferably 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 (average thickness of the insulating film 3 on one side/average thickness of the insulating film 3 on the other side) is preferably 0.95 or more and 1.05 or less. Further, the ratio of the elastic modulus of the other insulating film 3 to the elastic modulus of the one insulating film 3 (elastic modulus of the one insulating film 3/elastic modulus of the other insulating film 3) is preferably 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 short strip conductor 2 (average thickness of insulating film/average thickness of short strip conductor) is preferably 0.2, more preferably 0.3, and still more preferably 0.35. On the other hand, the upper limit of the above ratio is preferably 1.5, more preferably 1.2, and still more preferably 1.0. By setting the ratio of the average thickness of each insulating film 3 to the average thickness of the short strip conductor 2 to the above range, the ratio of the elastic restoring force of the pair of insulating films 3 to the shape retaining force of the short strip conductor 2 can be adjusted to an appropriate range, and as a result, the spring back angle can be reduced and a desired bent shape can be maintained.
The lower limit value of the ratio of the second order moment per 1mm width of the pair of insulating films 3 to the second order moment per 1mm width of the short strip-like conductor 2 (second order moment per 1mm width of the pair of insulating films/second order moment per 1mm width of the short strip-like conductor) is preferably 1.0, and more preferably 3.0. On the other hand, the upper limit of the above ratio is preferably 4.0 × 10, and more preferably 2.5 × 10. When the ratio is 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 short strip conductor 2 can be adjusted to an appropriate range, and as a result, the spring back angle can be reduced and a desired bent shape can be maintained.
The elastic modulus of each insulating film 3 is preferably 100MPa or more and 1400MPa or less. The lower limit of the elastic modulus is more preferably 150MPa, and still more preferably 200 MPa. On the other hand, the upper limit value of the elastic modulus is more preferably 720MPa, and still more preferably 350 MPa. The elastic modulus of the insulating film 3 is in the above range, whereby the elastic restoring force of the insulating film 3 can be made appropriate.
The average thickness of each insulating film 3 is 25 μm or more and 200 μm or less, and the elastic modulus is 100MPa or more and 1400MPa or less, whereby the spring back angle of the lead 1 for an electrical component after bending can be appropriately reduced. As a result, the operation of bending the lead 1 for an electrical component to maintain its shape is facilitated, and the workability is further improved.
The lower limit of the ratio of the average elastic modulus of the pair of insulating films 3 to the elastic modulus of the short strip conductor 2 (average elastic modulus of the pair of insulating films 3/elastic modulus of the short strip conductor 2) is preferably 1.0 × 10－3More preferably 2.0X 10－3. On the other hand, the upper limit of the above ratio is preferably 4.0 × 10－2More preferably 1.5X 10－2. When the ratio is 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 short strip conductor 2 can be adjusted to an appropriate range, and as a result, the spring back angle can be reduced and a desired bent shape can be maintained.
With regard to the lead 1 for an electrical component, the ratio of the elastic restoring force R per 1mm width of the pair of insulating films 3 to the shape retaining force H per 1mm width of the short strip-shaped conductor 2 is less than or equal to 0.15. The upper limit of the above ratio is preferably 0.10, and more preferably 0.05. The lower limit of the above ratio is not particularly limited, but is preferably 0.001, and more preferably 0.002.
The lead wire 1 for an electrical component preferably has a bend recovery angle (spring back angle) after being bent at 180 ° of 20 ° or less. According to the lead wire 1 for an electrical component described above, since the bending return angle (spring back angle) after bending by 180 ° is less than or equal to 20 °, the bent shape can be maintained more appropriately, and therefore the shape fixing work at the time of bending becomes easier, and the workability is further improved. Further, the smaller the above bend recovery angle is, the better, and preferably 12 ° or less, more preferably 5 ° or less, and most preferably 0 °.
< Electrical component >
The electrical component according to the embodiment of the present invention includes an electrical component lead 1. Examples of the Electric component using the lead 1 for Electric component include a nonaqueous electrolyte battery such as a lithium ion battery, and a capacitor such as a lithium ion capacitor and an Electric double-layer capacitor (EDLC). Of course, the lead 1 for an electrical component can be applied to all electrical components requiring a lead, and can obtain the same effect when applied to a battery or the like other than a nonaqueous electrolyte battery.
Next, a nonaqueous electrolyte battery having a lead 1 for an electrical component will be described with reference to the drawings by taking a lithium ion battery as an example.
(lithium ion Battery)
The lithium ion battery 4 shown in fig. 1 and 2 is obtained by sealing a battery element, which holds a nonaqueous electrolytic solution, inside a bag body 6. The battery element holds the nonaqueous electrolytic solution with a separator (not shown) interposed between the positive electrode 5A and the negative electrode 5B. As the nonaqueous electrolytic solution, for example, a nonaqueous electrolytic solution in which a lithium compound (LiClO) is dissolved in an organic solvent such as propylene carbonate (propylene carbonate) or γ -butyrolactone is used4、LiBF4Etc.).
The electrical component lead 1 is fixed to the bag 6 in the insulating film 3. In the lead 1 for an electrical component, one end 2A and the other end 2B of the strip-shaped conductor 2 are exposed from the insulating film 3, the exposed one end 2A of the strip-shaped conductor 2 is electrically connected to the positive electrode 5A or the negative electrode 5B of the battery element, and the exposed other end 2B of the strip-shaped conductor 2 protrudes from the bag 6.
Since the lithium ion battery 4 described above includes the lead 1 for the electrical component, the work for bending the lead 1 for the electrical component and maintaining the shape thereof can be simplified, and the work efficiency can be improved.
In addition, even when the lead 1 for an electrical component is applied to an electrical component other than the lithium ion battery 4, the work for maintaining the bent shape can be simplified, and thus the work efficiency can be improved.
[ examples ] A method for producing a compound
The present invention will be specifically described below with reference to experimental examples, but the present invention is not limited to the following experimental examples, and can be carried out with appropriate modifications within a range in which the gist of the present invention can be applied, and these are included in the technical scope of the present invention.
In this experimental example, the spring back angle of the lead wire was evaluated.
< lead >
The lead is formed by covering the center of the short strip conductor with a pair of insulating films so that both ends of the short strip conductor are exposed. As shown in fig. 4A and 4B, the short strip conductor 7 has a length LmIs 80mm, width Wm5mm, modulus of elasticity and average thickness TmThe values shown in table 1 below were used. The insulating films 8 are all of length LiIs 6mm, width Wi7mm, modulus of elasticity and average thickness TiThe values shown in table 1 below were used. In addition, the same insulating film is used for the 2 insulating films 8. The total average thickness of the short strip conductor 7 and the pair of insulating films 8 is defined as the average thickness T of the lead.
Second moment of cross section
Second moment [ m ] of the cross section of each 1mm width of the short strip conductor 74/1mm]Is towards 1/12 XWm[m]×(Tm[m])3/Wm[mm]And substituting each numerical value. Second order moment [ m ] of cross section of the pair of insulating films 84/1mm]Is towards 1/12 XWi[m]×{(T[m])3－(Tm[m])3}/Wi[mm]And substituting each numerical value.
< evaluation of rebound Angle >
The rebound angle was evaluated in the following manner. First, as shown in fig. 5A, an end face of a plate material X having a thickness of 0.5mm was brought into contact with the vicinity of the center in the longitudinal direction of the insulating film 8 on one side of the lead, the lead was gently bent by 180 ° so as to sandwich the plate material X, and then a load F was applied by placing a weight having a mass of 200g on the insulating film 8 on the other side, and this state was maintained for 10 seconds. Next, as shown in fig. 5B, the load was removed, and the springback angle θ deg (angle formed by the lead) when left for 5 seconds or more was measured, thereby performing evaluation. The results of measurement of the rebound angle are shown in table 1 below. Fig. 6 shows a relationship between the springback angle θ and a ratio (R/H) of the elastic restoring force R per 1mm width of the pair of insulating films to the shape retaining force H per 1mm width of the short strip conductor. The elastic restoring force R and the shape retaining force H of the lead are calculated based on the above equations (1) and (2), respectively.
[ Table 1]
As shown in table 1 and fig. 6, in group a (production examples 1 to 4), group B (production examples 5 to 8), and group C (production examples 9 to 12) in which the average thickness T1 of the short strip-shaped conductors was changed and the other conditions were the same, the spring back angle θ was also decreased in any group as the average thickness T1 of the short strip-shaped conductors increased, that is, as the ratio (R/H) of the elastic restoring force R to the shape retaining force H decreased. In addition, the thickness T2 of the insulating films of the groups a to C are different from each other, but when these groups a to C are compared, the springback angle θ is increased as the thickness T2 of the insulating film, that is, as the ratio (R/H) of the elastic restoring force R to the shape retaining force H is increased. From these results, it was determined that a good bent shape having a spring back angle of 20 ° or less can be maintained by adjusting the average thickness of the short strip conductors of the lead and the average thickness of the insulating film to set the ratio (R/H) of the elastic restoring force R to the shape retaining force H to 0.15 or less.
In both groups D (production examples 13 to 14) and groups E (production examples 15 to 16) in which the elastic modulus of the insulating film is changed and the other conditions are the same, the spring-back angle θ is increased with an increase in the elastic modulus of the insulating film, that is, an increase in the ratio (R/H) of the elastic restoring force R to the shape retaining force H in both groups D and E. From the results, it was determined that a favorable bent shape having a spring-back angle of 20 ° or less can be maintained by adjusting the elastic modulus of the insulating film of the lead to set the ratio (R/H) of the elastic restoring force R to the shape retaining force H to 0.15 or less.
In the group F (production examples 17 to 20) in which the elastic modulus is changed while the thicknesses of the short strip-shaped conductor and the insulating film are constant, if the ratio (R/H) of the elastic restoring force R to the shape retaining force H is decreased by an increase in the elastic modulus of the short strip-shaped conductor, a decrease in the elastic modulus of the insulating film, or a combination thereof, the spring-back angle θ is decreased accordingly. From the results, it was determined that a favorable bent shape having a spring-back angle of 20 ° or less can be maintained by adjusting the elastic modulus of the insulating film of the lead to set the ratio (R/H) of the elastic restoring force R to the shape retaining force H to 0.15 or less.
As shown in fig. 6, the elastic restoring force R shows a high correlation with respect to the ratio (R/H) of the shape retaining force H and the spring back angle, and particularly shows a higher correlation in the manufacturing example in which the ratio (R/H) is small (for example, 0.2 or less). Therefore, it can be confirmed that it is very effective to adjust the ratio (R/H) in order to reduce the rebound angle.
Description of the reference numerals
1. 11 lead wire for electric parts
2. 7, 12 short strip conductor
2A one end portion
2B another end part
3. 8, 13 insulating film
4 lithium ion battery
5A positive electrode
5B cathode
6 bag body
Central plane of M bending deformation
Claims (9)
1. A lead wire for an electrical component, which has a short strip conductor and a pair of insulating films covering both surfaces of the short strip conductor,
in the lead wire for an electrical component, the lead wire,
setting the second moment of the cross section of each 1mm width of the short strip conductor as ImEach of the pair of insulating filmsThe second moment of the cross section of 1mm width is set as IiIn the case of (a) in (b),
the second moment I of the cross section of the short strip conductor per 1mm width represented by the following equation 1mGreater than or equal to 5.0 x 10－15m4A thickness of 1mm to 8.0X 10－13m4/1mm，
A second moment I of cross section per 1mm width of the pair of insulating films represented by the following equation 2iGreater than or equal to 1.0 x 10－13m4A thickness of 1mm to 8.0X 10－12m4/1mm，
Equation 1: i ism1/12 x average width of short strip conductor (average thickness of short strip conductor)3The average width of the short strip conductors,
equation 2: i isi1/12 × average width of a pair of insulating films × { (average thickness of lead wire for electric component)3- (average thickness of short strip conductors)3-average width of a pair of insulating films.
2. The lead for an electrical component according to claim 1,
the lead for an electrical component has a bend recovery angle after 180 DEG bending of 20 DEG or less.
3. The lead for an electrical component according to claim 1 or 2,
the second moment I of the cross section of each 1mm width of the short strip conductormGreater than or equal to 2.0 x 10－14m41mm and less than or equal to 1.0X 10－13m4/1mm。
4. The lead for an electrical component according to claim 1 or 2,
a second order moment I per 1mm of the width of the pair of insulating filmsiGreater than or equal to 5.0 x 10－13m41mm and less than or equal to 1.0X 10－12m4/1mm。
5. The lead for an electrical component according to claim 1 or 2,
the average thickness of the short strip conductors is greater than or equal to 30 μm and less than or equal to 200 μm.
6. The lead for an electrical component according to claim 1 or 2,
the average thickness of each of the insulating films is not less than 25 μm and not more than 200 μm.
7. The lead for an electrical component according to claim 1 or 2,
each of the insulating films has a multilayer structure.
8. An electrical component having the lead wire for an electrical component according to claim 1.
9. The electrical component of claim 8,
the electric component is a nonaqueous electrolyte battery.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016143806A JP6705322B2 (en) | 2016-07-21 | 2016-07-21 | Lead wire for electric parts and electric parts |
| JP2016-143806 | 2016-07-21 | ||
| PCT/JP2017/024915 WO2018016347A1 (en) | 2016-07-21 | 2017-07-07 | Electrical component lead wire and electrical component |
| CN201780003233.9A CN108028329B (en) | 2016-07-21 | 2017-07-07 | Lead wire for electrical component and electrical component |
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| CN201780003233.9A Division CN108028329B (en) | 2016-07-21 | 2017-07-07 | Lead wire for electrical component and electrical component |
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| CN112310571B CN112310571B (en) | 2022-11-15 |
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| CN202011202455.3A Pending CN112310572A (en) | 2016-07-21 | 2017-07-07 | Lead wire for electrical component and electrical component |
| CN202011202219.1A Active CN112310571B (en) | 2016-07-21 | 2017-07-07 | Lead wire for electrical component and electrical component |
| CN202011202483.5A Active CN112310573B (en) | 2016-07-21 | 2017-07-07 | Lead wire for electrical component and electrical component |
| CN201780003233.9A Active CN108028329B (en) | 2016-07-21 | 2017-07-07 | Lead wire for electrical component and electrical component |
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| CN201780003233.9A Active CN108028329B (en) | 2016-07-21 | 2017-07-07 | Lead wire for electrical component and electrical component |
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| JP (1) | JP6705322B2 (en) |
| KR (4) | KR102121675B1 (en) |
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| WO2023119586A1 (en) * | 2021-12-23 | 2023-06-29 | 住友電気工業株式会社 | Lead wire for nonaqueous electrolyte battery, insulating film, and nonaqueous electrolyte battery |
| WO2023153301A1 (en) * | 2022-02-08 | 2023-08-17 | 住友電気工業株式会社 | Lead wire for nonaqueous electrolyte battery, insulating film, and nonaqueous electrolyte battery |
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Also Published As
| Publication number | Publication date |
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| KR102469860B1 (en) | 2022-11-23 |
| KR20180040652A (en) | 2018-04-20 |
| CN112310572A (en) | 2021-02-02 |
| CN108028329B (en) | 2020-11-24 |
| JP2018014272A (en) | 2018-01-25 |
| KR20200067925A (en) | 2020-06-12 |
| CN112310571B (en) | 2022-11-15 |
| CN112310573A (en) | 2021-02-02 |
| KR20210028743A (en) | 2021-03-12 |
| CN108028329A (en) | 2018-05-11 |
| KR102121675B1 (en) | 2020-06-10 |
| KR102229067B1 (en) | 2021-03-16 |
| WO2018016347A1 (en) | 2018-01-25 |
| KR102362932B1 (en) | 2022-02-14 |
| KR20220013587A (en) | 2022-02-04 |
| JP6705322B2 (en) | 2020-06-03 |
| CN112310573B (en) | 2023-01-03 |
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