WO2006008812A1

WO2006008812A1 - Structure of electrical lead part, electrical device having such lead part structure, cell and battery

Info

Publication number: WO2006008812A1
Application number: PCT/JP2004/010392
Authority: WO
Inventors: Hiroshi Yageta; Makihiro Otohata
Original assignee: Nec Lamilion Energy, Ltd.
Priority date: 2004-07-22
Filing date: 2004-07-22
Publication date: 2006-01-26

Abstract

A flat cell (1) comprises a cell element (3) contained in a package composed of packaging films (2a, 2b) together with an electrolyte solution, a positive electrode lead part (4) and a negative electrode lead part (8) respectively connected with the cell element (3) and extending from the package. The negative electrode lead part (8) consists of a copper plate (9). The positive electrode lead part (4) consists of an aluminum plate (5) which is connected with the positive electrode side of the cell element (3), and a copper plate (6) connected with the forward end part of the aluminum plate (5). The joint of the aluminum plate (5) and the copper plate (6) is coated with a coating resin (7) formed by thermally welding a film containing a thermoplastic resin.

Description

Specification

Electric lead structure, electric device having the lead structure, battery, and assembled battery

Technical field

The present invention relates to a structure of an electrical lead part used for electrical connection with another device in an electrical device, an electrical device having the structure, a battery, and an assembled battery.

Background art

[0002] Batteries used as power sources for portable devices such as mobile phones, notebook personal computers, digital still cameras, and video cameras are strongly required to be light and thin. In addition, there is a growing demand for resource saving and energy saving for the protection of the global environment, and the development of hybrid electric vehicles equipped with motor-driven batteries (batteries) is rapid. Is being promoted. Batteries mounted on these electric vehicles are also required to be lighter and thinner in order to improve steering characteristics and cruising distance.

In response to such a request, in order to make the battery lighter and thinner, a laminate material in which a metal layer such as aluminum and a heat-weldable resin layer are laminated on the exterior body to form a thin sheet is used. Batteries have been developed (see JP 2002-203524 A).

[0004] FIG. 1 shows an example of a conventional flat battery having a laminate material as an exterior body. In the battery shown in FIG. 1, a battery element (not shown) in which a positive electrode plate and a negative electrode plate are laminated via a separator is hermetically housed together with an electrolytic solution in an outer package 102 made of a laminate material. . A positive electrode terminal 104 connected to the positive electrode plate extends from one side of the outer package 102. A negative electrode terminal 108 connected to the negative electrode plate extends from the side of the outer body 102 opposite to the side where the positive electrode terminal 104 extends. In the case of a nonaqueous electrolyte battery such as a lithium ion battery, aluminum power is used as the positive electrode terminal 104 and copper or nickel is often used as the negative electrode terminal 108 due to its electrical characteristics.

In a battery having such a configuration, a plurality of batteries are connected in series in order to obtain a desired voltage. It is necessary to In that case, for example, the batteries are arranged in a line, and the positive electrode terminal is joined to the negative electrode terminal of the adjacent battery to constitute an assembled battery.

[0006] However, in the conventional battery described above, the positive electrode terminal and the negative electrode terminal are made of different metals, and therefore, when a plurality of batteries are connected in series, different metals are bonded to each other. Become. When different metals are joined together, if an electrolyte such as dew condensation water is present at the joint between the two, a local battery is formed between these three, and the anode side metal (the metal with the higher ionization tendency) is formed. ) Will corrode. This is also called local battery corrosion, and it is a problem that can generally occur when joints of different metals are exposed to the outside air, and water that is a type of electrolyte adheres to the joints due to condensation. . When the terminal is corroded, the electrical resistance of the terminal is increased, and if the battery characteristics are deteriorated, not only the power but also the reliability of the battery is decreased.

[0007] Further, the above-mentioned problem of local battery corrosion is not limited to the case where batteries made of different metals at both terminals are connected in series, but an electrolytic capacitor such as a solid electrolytic capacitor, aqueous or non-aqueous electrolytic capacitor, In other electrical devices with lead terminals, such as multilayer capacitors, transformers, lamps, motors, resistors, etc., the lead terminals are used for electrical connection with other devices or to reduce material costs. In the case of a structure having a joint portion with a metal of a different material, it can occur in the same manner.

Disclosure of the invention

[0008] An object of the present invention is to provide an electrical lead portion structure, an electrical device, a battery, and an assembled battery that can maintain electrical characteristics over a long period of time by preventing corrosion of a terminal due to formation of a local battery. And

[0009] In order to achieve the above object, the structure of the electric lead portion of the present invention is an electric lead portion structure provided extending from the device body of the electric device, wherein the first terminal member extends from the device body. And a second terminal member that is joined to the first terminal member on the outside of the device body and electrically connected to another device, and a joint portion between the first terminal member and the second terminal member is covered. Coating resin. The material of the second terminal member is different from that of the first terminal member. The covering resin is made of a film containing a thermoplastic resin, and covers the joint by thermally fusing the film in a state of surrounding the joint between the first terminal member and the second terminal member. is doing.

[0010] The electrical device of the present invention is an electrical device having a device main body and positive and negative electrode lead portions extending from the device main body. Is applied.

In the present invention configured as described above, the first terminal member and the second terminal member are joined on the outside of the device main body. The first terminal member and the second terminal member are made of different materials. If the first terminal member and the second terminal member are in contact with the outside air, a local battery may be formed due to condensation or the like at the joint. However, the joint part of both terminal members is covered with a coating resin formed by heat-sealing a film made of a thermoplastic resin and is shielded from the outside air, so that a local battery is not formed. Absent. Therefore, by making the second terminal member the same material as the lead part of the device on the other side to be connected, a local battery can be formed even if condensation occurs by simply connecting the two devices. Connections that can be avoided are possible.

[0012] In the above invention, the film is preferably transparent. As a result, the covering state of the joint portion between the first terminal member and the second terminal member can be visually confirmed. In addition, the first terminal member and the second terminal member are configured such that their end portions are overlapped with each other, and the direction is perpendicular to the overlapping direction of the first terminal member and the second terminal member. By filling the filler between the first and second terminal members and the film on both side ends of the joint portion, the joint portion is more reliably covered with the filling resin. In this case, a thermoplastic resin can be used as the filler.

[0013] The present invention also provides a battery and an assembled battery using the structure of the electrical lead part.

That is, the battery of the present invention has a battery element hermetically sealed in the outer package, and positive and negative electrode lead portions connected to the battery element and extending from the outer package. Either one of the lead parts is connected to the battery element and extends the outer body strength, and the first terminal member has a material force different from that of the other lead part and the first terminal member outside the outer body. And a second terminal member having the same material force as that of the other of the lead portions. The joint between the first terminal member and the second terminal member surrounds a film containing a thermoplastic resin. It is covered with a coating resin formed by heat-sealing.

In the battery of the present invention, the structure of the present invention described above is applied to the positive electrode or negative electrode lead portion, and the tip portion of the positive electrode lead portion and the tip portion of the negative electrode lead portion are made of the same material. When these batteries are connected in series, even if they are connected as they are to form an assembled battery, there is no problem of corrosion due to the formation of local batteries.

[0016] Further, if the structure of the electric lead portion of the present invention described above is used, the battery element hermetically sealed in the exterior body and the material connected to the battery element and extending from the exterior body are different from each other. In an assembled battery in which a plurality of batteries having positive and negative electrode lead portions are connected in series, the joint portion of the lead portion between two batteries connected to each other is heated in a state of surrounding a film containing a thermoplastic resin. An assembled battery covered with a coating resin formed by fusing can also be configured.

[0017] According to the present invention, the joint between terminal members of different materials is covered with the coating resin formed by heat-sealing a film containing a thermoplastic resin, so that the joint is against the outside air. Therefore, even if condensation or the like occurs, a local battery is not formed at the joint, and corrosion due to the formation of the local battery can be prevented. As a result, it is possible to maintain the electrical characteristics of leads and electrical devices over a long period of time and improve reliability. The present invention is particularly effective when applied to batteries in which the same structure is often connected in series.

[0018] If the film constituting the coating resin is transparent, the force S for visually confirming the covering state of the joint portion can be obtained. Furthermore, filling the filler between the terminal member and the film makes it possible to more reliably cover the joint portion.

Brief Description of Drawings

FIG. 1 is an external perspective view showing an example of a conventional flat battery using a laminate material as an exterior body.

FIG. 2 is an external perspective view of the flat battery according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of the flat battery shown in FIG. 2.

4 is an exploded perspective view of the positive electrode lead portion shown in FIG.

5 is a cross-sectional view of the positive electrode lead portion shown in FIG. 2 along the extending direction.

FIG. 6 is a schematic side view of an assembled battery in which the flat batteries shown in FIG. 2 are connected in series. FIG. 7 is a schematic side view of an assembled battery in which flat batteries having different materials for the positive electrode lead part and the negative electrode lead part are connected in series and the connection part is covered with a coating resin.

FIG. 8 is a schematic side view when the assembled battery shown in FIG. 6 is further connected in parallel.

FIG. 9A is a plan view of the positive electrode lead portion for explaining a gap in the coating resin generated in the positive electrode lead portion of the flat battery shown in FIG. 2.

FIG. 9B is a cross-sectional view taken along line 9B-9B of FIG. 9A.

FIG. 10A is a plan view showing a structure of a positive electrode lead portion of a flat battery according to a second embodiment of the present invention.

10B is a cross-sectional view taken along line 10B-10B in FIG. 10A.

FIG. 11A is a diagram for explaining an example of a method of covering the joint portion of the positive electrode lead portion when the filler is a thermoplastic resin in the second embodiment of the present invention.

FIG. 11B is a diagram showing a step subsequent to FIG. 11A as an example of the method of covering the joint portion of the positive electrode lead portion when the filler is a thermoplastic resin in the second embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described with reference to the drawings.

[0021] (First embodiment)

Referring to FIGS. 2 and 3, the flat battery 1 of the present embodiment is also called a film-clad battery, and includes a battery element 3, a positive current collector 3a and a negative current collector 3b provided in the battery element 3. The battery case 3 includes an exterior body 2 that houses the battery element 3 together with an electrolytic solution, a positive electrode lead portion 4 connected to the positive electrode current collector 3a, and a negative electrode lead portion 8 connected to the negative electrode current collector 3b.

[0022] The exterior body 2 is composed of two exterior films 2a and 2b that surround and surround the battery element 3 from above and below in the thickness direction, and the peripheral portions of these exterior films 2a and 2b are heat-sealed over the entire circumference. Thus, the battery element 3 is hermetically sealed. Further, at least one of the exterior films 2a and 2b is formed with a cup portion that matches the outer shape of the battery element 3, and the battery element 3 is accommodated in a space formed by the force portion. . By forming the cup portion on the exterior films 2a and 2b as described above, it becomes difficult to generate a crease on the exterior films 2a and 2b when the battery element 3 is hermetically sealed. The exterior films 2a and 2b are not particularly limited as long as the airtightness in the space in which the battery element 3 is stored can be maintained, but a metal foil and a thermoplastic resin are stacked. Layered laminating films are preferably used.

The battery element 3 has a structure in which a plurality of positive plates and a plurality of negative plates each coated with an electrode material are alternately stacked with a separator interposed therebetween. Each positive electrode plate and each negative electrode plate are formed with protruding portions of the electrode material that are not coated, and these uncoated portions are ultrasonically welded together for each polarity. A current collector 3b is configured. The positive electrode plate and the negative electrode plate are made of different materials. In the present embodiment, the positive electrode plate is made of aluminum foil, and the negative electrode plate is made of copper foil. Therefore, the positive electrode current collector 3a is made of aluminum, and the negative electrode current collector 3b is made of copper.

[0024] The structure described above is a force S called a stacked type, and the battery element 3 may be a wound type. In the wound type, a positive electrode plate, a negative electrode plate, and a separator are formed into a strip shape, and these are laminated, then wound, further compressed into a flat shape, and extended from the positive electrode plate and the negative electrode plate. The coated portions are connected to the positive electrode lead portion 4 and the negative electrode lead portion 8, respectively.

The negative electrode lead portion 8 is composed of one copper plate 9. Since the copper plate 9 and the negative electrode current collector 3b are made of the same material, both are well bonded.

The positive electrode lead portion 4 includes an aluminum plate 5 that is a first terminal member, a copper plate 6 that is a second terminal member, and a coating resin 7. One end of the aluminum plate 5 is joined to the positive electrode current collector 3 a and the other end extends from the exterior body 2. Since the aluminum plate 5 and the positive electrode current collector 3a are made of the same material, both are well connected. One end portion of the copper plate 6 overlaps and is joined to at least a part of the portion of the anode plate 5 extending from the exterior body 2. For joining the aluminum plate 5 and the copper plate 6, ultrasonic welding, laser welding, alloy welding, or the like can be used. The same applies to the joining between the aluminum plate 5 and the positive electrode current collector 3a and the joining between the copper plate 9 on the negative electrode side and the negative electrode current collector 3b. The positive electrode copper plate 6 and the negative electrode copper plate 9 may be plated with a metal material that does not cause local battery corrosion problems, such as nickel.

[0027] The positive electrode lead portion 4 and the negative electrode lead portion 8 are preferably 1 mm in thickness and 1 mm in thickness, and preferably 1 mm in width and 100 mm in width. Outside these ranges, it becomes difficult to pass a current of a desired magnitude, and more space is wasted and the weight is increased than necessary. [0028] The coating resin 7 prevents at least a joint portion of the positive electrode lead portion 4 between the aluminum plate 5 and the copper plate 6, that is, a region where the aluminum plate 5 and the copper plate 6 overlap each other from being exposed to the outside air. Is covered.

[0029] Hereinafter, the covering of the joint will be described in more detail with reference to FIG. 4 and FIG.

[0030] The coating resin 7 is composed of two coatings having an area sufficient to cover the aluminum plate 5 and the copper plate 6 in a range including a joint portion between the aluminum plate 5 and the copper plate 6 (hereinafter also simply referred to as a joint portion). Finolem 7a, 7b power, etc. These covering films 7a and 7b contain a thermoplastic resin. When the covering films 7a and 7b are sandwiched between the both side forces in the plate thickness direction of the positive electrode lead portion 4 and heated, the thermoplastic resin is melted and the covering films 7a and 7b are heated. 7b fuse around the joint. As a result, the joint between the aluminum plate 5 and the copper plate 6 is blocked from outside air. Here, the force described in the case where two coating films 7a and 7b are used as the coating resin 7, one coating film may be folded in half, and the aluminum plate 5 and the copper plate 6 may be sandwiched within a range including the joint portion. .

[0031] The method for heating the coating films 7a and 7b is not particularly limited as long as the method can heat the thermoplastic resin contained in the coating films 7a and 7b to a temperature equal to or higher than its melting temperature. As a simple method, a method of blowing hot air, a method of heating by pressing a pressure member such as a roller block incorporating a heater, and the like can be mentioned. The method of blowing hot air can be heated over a wide range. The method of heating while pressurizing with a pressure member allows local heating.

[0032] The thermoplastic resin contained in the coating films 7a and 7b is not particularly limited, but a material having excellent adhesion to a metal is preferably used. Examples of such thermoplastic resins include ethylene-butyl acetate copolymer, acid-modified polyethylene, acid-modified polypropylene, copolymers thereof, polyacrylic acid, polyacrylic acid ester, polymethacrylic acid ester and the like. Examples include ril resin and ionomer.

[0033] In particular, when heating is performed while applying pressure with a pressure member, if the coating films 7a and 7b are made of only a thermoplastic resin, the molten resin may adhere to the pressure member. is there. Therefore, in order to prevent the covering films 7a and 7b from adhering to other objects, the covering films 7a and 7b are composed of a thermoplastic resin layer on one side and the other side as one side. It is preferable that the laminated film is a heat-resistant resin layer having a higher melting point than the resin to be coated, and the bonding portion is covered with the thermoplastic resin layer as the inner side. Thus, when covering the joint, if the covering films 7a and 7b are heated at a temperature equal to or higher than the melting temperature of the thermoplastic resin layer and lower than the melting temperature of the heat-resistant resin layer, the inner layer is melted. Since the outer layer does not melt, it is possible to reliably cover the joint where the coating films 7a and 7b do not adhere to the pressure member. Examples of such heat resistant resins include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyamides such as nylon, polyimides, and polyphenylene sulfide.

[0034] When the coating films 7a and 7b are laminated films, they may be a two-layer film of a thermoplastic resin layer and a heat-resistant resin layer, but a layer having a desired function such as a gas barrier layer between the two layers. May be interposed.

[0035] As described above, the positive electrode lead portion 4 has a structure in which the aluminum plate 5 and the copper plate 6 are joined, so that a series type battery in which a plurality of flat batteries 1 are connected in series as shown in FIG. In the case of an assembled battery, even if the positive electrode lead part 4 and the negative electrode lead part 8 are joined as they are, the joint parts of the two are made of the same material, so even if condensation occurs, local battery corrosion does not occur. Further, since the positive electrode lead portion 4 and the negative electrode lead portion 8 are bonded between the same metals, they can be easily formed. On the other hand, the positive electrode lead portion 4 has a structure in which the aluminum plate 5 and the copper plate 6 are joined, but the joint portion of both is covered with the coating resin 7 and is shielded from the outside air. However, the problem of local battery corrosion does not occur. As a result, corrosion of the lead due to the structure can be prevented, and the increase in electrical resistance due to corrosion is suppressed, so that desired battery characteristics such as output voltage and current capacity can be maintained over a long period of time. Reliability can be improved.

[0036] Covering the joint portion with the coating resin 7 may be performed after the battery element 3 is hermetically sealed in the exterior body 2, or before the positive electrode lead portion 4 is connected to the battery element 3, an aluminum plate is previously formed. 5 and a copper plate 6 are joined together, and a positive electrode lead part 4 in which the joint part is coated with a coating resin 7 is produced as an assembly, and the produced positive electrode lead part 4 assembly is connected to the battery element 3 and Thereafter, the battery element 3 may be hermetically sealed in the exterior body 2. Considering the ease of work including the handling of parts when covered with coating resin 7, before connection to battery element 3. Further, it is preferable that the positive electrode lead portion 4 in which the aluminum plate 5 and the copper plate 6 are joined and the joint portion is coated with the coating resin 7 is prepared in advance.

In the above description, an example in which the flat battery 1 is a single body and the positive electrode lead portion 4 is formed by bonding different metals to each other and covering the bonding portion with the coating resin 7 is shown. In addition to this, as shown in FIG. 7, in the flat battery 1 ′ alone, the positive electrode lead portion is composed only of the aluminum plate 5 and the negative electrode lead portion is composed only of the copper plate 9, and the flat battery 1 ′ is connected in series. When connecting, the joint portion between the positive electrode lead portion and the negative electrode lead portion can be covered with the coating resin 7 to form a series-type assembled battery.

[0038] By the way, the series assembled battery shown in FIGS. 6 and 7 is obtained by connecting flat batteries 1 and 1 'in series in order to obtain a desired voltage. If the current capacity is to be obtained, series-type assembled batteries are further connected in parallel. At this time, for example, when a plurality of series-type assembled batteries shown in FIG. 6 are connected in parallel, the series-type assembled batteries are arranged in the thickness direction of the flat battery 1 as shown in FIG. The joined portions of the positive electrode lead portion 4 and the negative electrode lead portion 8 are further joined between the upper and lower assembled batteries. Since the positive electrode lead 4 has a structure in which a metal made of the same material as that of the negative electrode lead 8 is bonded to the leading end in advance, even when a plurality of flat batteries 1 are connected in parallel, as a result, Since it is sufficient to join, it can be joined easily and there is no force or local battery corrosion.

In the above description, as shown in FIG. 4, the joint between the aluminum plate 5 and the copper plate 6 in the positive electrode lead portion 4 is sandwiched between two coating films 7a and 7b, and this is connected. The coated films 7a and 7b were brought into close contact with each other by heating. At this time, particularly when the covering films 7a and 7b are heated by a pressure member, as shown in FIGS. 9A and 9B, the gap 17a along the longitudinal direction of the positive electrode lead portion 4 on both sides in the width direction of the positive electrode lead portion 4 is shown. In addition, a gap 17b may be formed along the width direction of the positive electrode lead portion 4 at the step portion between the aluminum plate 5 and the copper plate 6. The gaps 17a and 17b are easily formed when the coating films 7a and 7b softened by heating do not sufficiently follow the step in the thickness direction of the positive electrode lead portion 4. It depends on the thickness of 5 and the thickness of the copper plate 6.

[0040] Among such gaps 17a and 17b, in particular, the gaps 17a on both sides in the width direction of the positive electrode lead portion 4 can also serve as a path for communicating the joint between the aluminum plate 5 and the copper plate 6 with the outside air. [0041] Therefore, it is preferable that the covering films 7a and 7b are made of a transparent resin so that the presence of the gap 17a can be visually confirmed through the covering films 7a and 7b. Here, “transparent” may be transparent so that the presence of the gap 17a which does not need to be completely transparent can be visually confirmed.

[0042] By thus forming the covering films 7a and 7b with a transparent resin, it is easily confirmed whether or not the joint portion between the anodoleum plate 5 and the copper plate 6 is completely covered with the covering resin 7. The power to do S. If the presence of the gap 17a is confirmed, the positive electrode lead portion 4 is treated as a defective product. The positive electrode lead portion 4 treated as a defective product is excluded from the subsequent manufacturing process of the flat battery 1 and discarded or sent to the repair process for reuse of the aluminum plate 5 and the copper plate 6 .

[0043] As shown in Fig. 7, when the flat batteries 1 'are connected in series, the joint between the positive electrode lead portion and the negative electrode lead portion is covered with the coating resin 7 in the case where the coating is applied. If the above defects occur, the assembled battery as a whole becomes defective. On the other hand, by preparing the positive electrode lead part 4 itself as an assembly in which the aluminum plate 5 and the copper plate 6 are joined, even if a defect occurs in the coating process with the coating resin 7, the defective product can be discarded or The number of man-hours required for repair is minimal.

[0044] (Second Embodiment)

Referring to FIGS. 10A and 10B, the structure of the positive electrode lead portion of the flat battery according to the second embodiment of the present invention is shown. In FIGS. 10A and 10B, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.

As shown in FIGS. 10A and 10B, in this embodiment, the coating resin 7 includes coating films 7a and 7b and a filler 11. The filler 11 is filled between the aluminum plate 5 and the copper plate 6 and the coating resin 7 in the region where at least both of them overlap each other in the width direction.

[0046] By attaching the filler 11 in this way, for example, a portion corresponding to the gap 17a shown in FIG. 9A, where the joint between the aluminum plate 5 and the copper plate 6 can communicate with the outside air is provided. The gap 17a is substantially not formed. As a result, the joint It can be coated in a state where it is shut off from the outside air more reliably, and it is possible to prevent local battery corrosion more reliably.

[0047] In the present embodiment, since the gap is not formed in the coating resin 7 at both ends in the width direction of the aluminum plate 5 and the copper plate 6, compared to the first embodiment, the coating film The need to make 7a and 7b transparent is low. However, in the present embodiment as well, a gap may be generated depending on the variation in the filling amount of the filler 11, so that it is preferable to make the covering finales 7a and 7b transparent.

[0048] As the filler 11, a thermoplastic resin can be preferably used. When a thermoplastic resin is used as the filler 11, the positive electrode lead portion 4 can be produced, for example, as follows.

First, as shown in FIG. 11A, after joining the aluminum plate 5 and the copper plate 6, the thermoplastic resin as the filler 11 is respectively attached to both ends in the width direction of the joined portion, for example, hot-melt bonding. Attach with agent. Next, as shown in FIG. 11B, the portions to be covered are sandwiched between the two covering films 7a and 7b, and the covering films 7a and 7b are heated. As a result, the covering films 7a and 7b melt and adhere to the aluminum plate 5 and the copper plate 6. At the same time, the filler 11 softens or melts, and the covering films 7a and 7b are between the covering films 7a and 7b. 9B, as shown in FIG. 9B, the both sides in the width direction are filled with no gap at the joint between the aluminum plate 5 and the copper plate 6. As described above, in order to soften or melt the filler 11 by using the heat obtained when heating the coating films 7a and 7b, the thermoplastic resin constituting the filler 11 is used as the coating film 7a, It is preferable that the melting point of the thermoplastic resin contained in 7b is equal to or lower than the melting point. Further, it is preferable to use a compatible combination of the thermoplastic resins, and it is more preferable to use the same resin material.

[0050] The shape of the filler 11 before being softened or melted is not particularly limited as long as it can be in close contact with surrounding members (coating films 7a and 7b, the aluminum plate 5 and the copper plate 6) without melting. However, in order to minimize the amount of the filler 11 used, it is preferable that the filler has a rod shape along both ends in the width direction of the joint. In addition, the dimension of the positive electrode lead portion 4 in the longitudinal direction is preferably equal to or longer than the length of the joint portion in the longitudinal direction of the positive electrode lead portion 4. Dimension combining thickness and copper plate 6 thickness The above is preferable.

[0051] As the filler 11, an ultraviolet curable resin may be used in addition to the above-described thermoplastic resin. In this case, the curing of the filler 11 is performed by irradiating ultraviolet rays through the coating films 7a and 7b after being filled between the coating films 7a and 7b. Therefore, the coating films 7a and 7b are made of a transparent resin. For example, it is necessary to use a resin that transmits ultraviolet rays. When an ultraviolet curable resin is used as the filler 11, the filling method of the filler 11 is, for example, by covering the joint with the coating films 7a and 7b and then finely filling the gap 17a shown in FIG. 9A. Examples of the method include filling the ultraviolet curable resin with a tube or the like and then irradiating the ultraviolet rays through the coating films 7a and 7b to cure the ultraviolet curable resin.

[0052] While the present invention has been described with reference to some typical embodiments, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the idea of the present invention. Can be added.

[0053] For example, in the above-described embodiment, the positive electrode lead portion has a structure in which two types of metals are joined so that the tip side is made of the same material as the negative electrode lead portion, but the positive electrode lead portion is made of one type of metal. Instead, the negative electrode lead portion may be configured such that two kinds of metals are bonded so that the tip side is made of the same material as the positive electrode lead portion, and the bonded portion is covered with a coating resin.

[0054] Further, in the above-described embodiment, a force showing an example in which the present invention is applied to a lead portion of a battery. The present invention relates to a device body that exhibits a desired function and leads of a positive electrode and a negative electrode extending therefrom. It can be applied to the structure of the lead part in various electrical devices that have a part and a local battery is formed by condensation or the like, which may cause deterioration of electrical characteristics due to corrosion. In that case, if the material of the terminal member connected to the other device at the tip of the lead is the same material as the lead of the other device, the lead device can be connected simply by connecting these devices. No local battery is formed at the junction. Examples of electrical devices to which the present invention can be applied include electrolytic capacitors such as solid electrolytic capacitors, aqueous or non-aqueous electrolytic capacitors, electric double layer capacitors, transformers, lamps, motors, resistors, and the like.

Claims

The scope of the claims

[1] A device body force of an electrical device, a structure of an electrical lead portion provided extending from the device body, the first terminal member extending from the device body;

A second terminal member made of a material different from the first terminal member, which is joined to the first terminal member outside the device main body and electrically connected to another device; and includes a thermoplastic resin. A structure of an electric lead portion comprising a film and having a coating resin that covers the joint portion by heat-sealing the film in a state of surrounding the joint portion between the first terminal member and the second terminal member .

[2] The structure of the electrical lead portion according to claim 1, wherein the film is transparent.

[3] The film is a laminated film having a layer made of the thermoplastic resin and a layer made of a heat-resistant resin having a melting point higher than that of the thermoplastic resin on opposite surfaces, and the thermoplastic resin The structure of the electrical lead part according to claim 1, wherein the joining part is covered with a layer made of

[4] The first terminal member and the second terminal member are joined with their end portions overlapped with each other, and the first terminal member and the second terminal member overlap. The structure of the electrical lead part according to claim 1, wherein a filler is filled between the first and second terminal members and the film on both side ends of the joint part in a direction perpendicular to the direction.

5. The structure of the electric lead part according to claim 4, wherein the filler is a thermoplastic resin.

[6] The device body,

A positive electrode and a negative electrode lead extending from the device body;

2. The electrical device having the structure of the electrical lead part according to claim 1, wherein one of the positive electrode and the negative electrode lead part.

[7] a battery element hermetically sealed in the exterior body;

Having positive and negative electrode lead portions connected to the battery element and extending the outer body strength;

Any one of the lead portions is connected to the battery element and extends from the exterior body. The first terminal member has a material force different from that of the other lead portion, and the exterior body. A second terminal member joined to the tip of the first terminal member on the outside of the first terminal member and having the same material force as the other end of the lead portion,

A battery in which a joining portion between the first terminal member and the second terminal member is covered with a coating resin formed by heat-sealing in a state of surrounding a film containing a thermoplastic resin.

8. The battery according to claim 7, wherein the film is transparent.

[9] The film is a laminated film having a layer made of the thermoplastic resin and a layer made of a heat-resistant resin having a melting point higher than that of the thermoplastic resin on opposite surfaces, and the thermoplastic resin The battery according to claim 7, wherein the joining portion is covered with a layer made of

[10] The first terminal member and the second terminal member are joined with their end portions overlapped with each other, and the first terminal member and the second terminal member overlap. 8. The battery according to claim 7, wherein a filler is filled between the first and second terminal members and the film on both side ends of the joint in a direction perpendicular to the direction.

[11] The battery according to claim 10, wherein the filler is a thermoplastic resin.

[12] The first terminal member is made of copper, the second terminal member is made of aluminum, and the first terminal member and the second terminal member are joined to each other. The battery according to claim 7, wherein the lead portion is a lead portion of the positive electrode.

[13] An assembled battery comprising the plurality of batteries according to claim 7 connected in series.

[14] A battery element hermetically sealed in the exterior body, and positive and negative electrode lead portions made of different materials and connected to the battery element and extending from the exterior body, and connected in series With batteries,

And a covering resin formed by heat-sealing in a state of surrounding a film containing a thermoplastic resin that covers a joint portion of the lead portion between the two batteries connected to each other.