JP2010033766A - Battery, vehicle, battery-loaded apparatus, and manufacturing method of battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery capable of having inner conduction members and outer terminal members welded with deterioration of a resin spacer restrained, a vehicle loading such a battery and a battery-loaded apparatus, as well as a manufacturing method of such a battery. <P>SOLUTION: The battery 1 is provided with a power-generating element 50, a battery case 10, inner conduction members 25, 35 equipped with penetrating connection parts 26, 36 penetrating the battery case to protrude outside, outer terminal members 21, 31 making up welded parts PP1, PN molten together with the penetrating connection parts by welding with the penetrating connection parts, a resin spacer 41 intercalated between the battery case and the outer terminal members. The penetrating connection parts include superposed parts 27, 37 superposed on outer side faces 22A, 32A of the outer terminal members, and the welded parts are formed inside the superposed parts and the outer terminal members by butt welding of the superposed parts with the outer terminal members with the use of energy beams EB. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery formed by welding an external terminal member, a vehicle equipped with such a battery, a battery-equipped device, and a method for manufacturing the battery.

In recent years, with the spread of portable electronic devices such as mobile phones, notebook computers, and video camcorders and vehicles such as hybrid electric vehicles, the demand for batteries used for these driving power sources is increasing.
Among such batteries, there is a battery in a form in which a metal terminal member serving as a positive electrode or a negative electrode is fixed to the outside of a battery case. For example, there is a battery described in Patent Document 1 in which an output terminal is caulked and fixed to a lid (battery case) via a resin gasket.

Japanese Patent Application No. 2000-208130

  As a structure of such an output terminal, for example, as shown in FIG. 1A, an internal conductive member Q20 that is electrically connected to a power generation element in the battery case Q10 is connected to an external terminal member Q30 that is located outside the battery case Q10. It can also be fixed in place. Specifically, the internal conduction member Q20 is inserted through the through hole Q31 of the external terminal member Q30 and protrudes from the battery case Q10 to the outside, and the protruded portion is pressed toward the external terminal member Q30 and penetrates therethrough. The outer terminal member Q30 is crimped so as to be plastically deformed into a shape larger in diameter than the hole Q31.

In such a terminal structure, when welding the external terminal member Q30 and the internal conduction member Q20 to increase the joint strength, for example, as shown in FIG. It is conceivable to perform through welding by irradiating an energy beam (for example, an electron beam) EB.
However, when this energy beam (electron beam) EB reaches the external terminal member Q30 via the internal conductive member Q20 and melts them to form the welded portion Q50, a large amount of heat is generated in the internal conductive member Q20. Take it. Therefore, part of the heat reaches the resin spacer Q40 made of an insulating resin that insulates between the external terminal member Q30 and the battery case Q10 through the external terminal member Q30. The spacer Q40 may be altered.
Moreover, in penetration welding, it is difficult to confirm by appearance whether or not the internal conduction member Q20 and the external terminal member Q30 are reliably welded.
It should be noted that there is a similar problem if an electron beam, a laser, an ion beam, or the like is used as the energy beam.

  The present invention has been made in view of such a problem, and a battery capable of welding an internal conductive member and an external terminal member while suppressing deterioration of a resin spacer, a vehicle equipped with such a battery, and a battery mounted The purpose is to provide equipment. Moreover, it aims at providing the manufacturing method of such a battery.

  And the solution means includes a power generation element, a battery case containing the power generation element, and an internal conduction member disposed in the battery case and electrically connected to one electrode of the power generation element An internal conductive member having a through-connection portion that penetrates the battery case and protrudes to the outside of the battery case, and is disposed outside the battery case and welded to the through-connection portion of the internal conductive member. An external terminal member comprising a welded portion melted together with the through-connecting portion of the internal conductive member by welding, and at least the welded portion of the battery case and the external terminal member And a resin spacer interposed between the battery case side portion and the through-connection portion facing the battery case on the outer surface of the external terminal member. And an overlapping portion that overlaps with the outer surface located on the opposite side, and the welding portion is formed in the overlapping portion and the external terminal member by butt welding of the overlapping portion and the external terminal member using an energy beam. It is a battery formed in.

In the battery of the present invention, on the outer surface of the external terminal member, the overlapping portion of the through connection portion of the internal conduction member is overlapped, and the overlapping portion and the external terminal member using the energy beam are butt welded, Formed in the overlapping portion and the external terminal member. For this reason, since the energy required for welding can be reduced as compared with, for example, through welding performed by penetrating the overlapping portion, it is possible to suppress deterioration of the resin spacer due to heat of welding.
Further, it is possible to easily determine from the appearance that the overlapping portion and the external terminal member are reliably welded.

  In addition, although the internal conduction member is electrically connected to the electrode plate of one electrode of the power generation element, the internal conduction member may be directly connected or indirectly connected. In addition, the external terminal member and the internal conductive member and the battery case may be insulated or conductive. Therefore, the resin spacer may or may not insulate the external terminal member and the battery case.

  Moreover, the penetration connection part of an internal conduction member should just be welded with the external terminal member in the superimposition part. Furthermore, examples of the energy beam include a laser, an electron beam, and an ion beam.

  Furthermore, in the battery described above, the external terminal member has, on the outer surface side, a bulging portion that bulges outward from a surrounding low level portion and becomes a high level, and the internal conduction member has the bulging portion. The overlapping portion of the through-connecting portion overlaps the low-order portion of the external terminal member, and has its own end faced against the side surface of the bulging portion and welded to the bulging portion. Good.

In the battery of the present invention, the overlapping portion overlaps the lower portion of the external terminal member, while the end portion of the overlapping portion is abutted against the side surface of the bulging portion and welded. be able to.
Also, since the outer terminal member is welded to the bulging portion, the dimension of the external terminal member interposed between the welded portion and the resin spacer is smaller than when welding without providing the bulging portion. It can be secured. For this reason, transmission of heat to the resin spacer can be suppressed, and alteration of the resin spacer due to heat can be further suppressed.

  Examples of the side surface of the bulging portion include a side surface (tubular surface) when the bulging portion is columnar, and a side surface (slope) when the bulging portion is conical or frustum-shaped.

  Furthermore, the battery according to any one of the above, wherein the overlapping portion is formed by caulking and deforming a part of the through-connection portion after the through-connection portion is passed through the battery case. Good.

  In the battery according to the present invention, after the through-connection portion is passed through the battery case, a part of the through-connection is caulked and deformed to form the overlapping portion. For this reason, it can be set as the battery which formed the superimposition part of an appropriate shape easily irrespective of the shape of the penetration connection part at the time of making a penetration connection part penetrate the battery case.

  Further, another solution includes: a power generation element; a battery case containing the power generation element; and an internal continuity disposed in the battery case and electrically connected to one electrode of the power generation element. An internal conductive member having a through-connection portion that penetrates the battery case and protrudes to the outside of the battery case; and the through-connection portion of the internal conductive member that is disposed outside the battery case. An external terminal member welded to form a welded portion melted together with the through-connecting portion of the internal conductive member by welding, and at least the welded portion of the battery case and the external terminal member And a resin spacer interposed between the battery case side portion and the external terminal member on the opposite side to the surface facing the battery case of the outer surface. A bulging portion that bulges outward from the surrounding lower level portion and becomes higher than the surrounding lower level portion, and the through connection portion includes a terminal through portion that penetrates the external terminal member, and the terminal A superposed portion having a form expanded in diameter than the penetrating portion, overlapping with the outer side surface of the lower portion of the external terminal member, and having an end portion thereof butted against the side surface of the bulging portion, The welded portion is formed in the overlapped portion and the external terminal member by butt welding the end portion of the overlapped portion and the bulging portion of the external terminal member using an energy beam. Thus, the resin spacer is a battery made of an insulating resin and insulated between the battery case and the external terminal member.

In the battery of the present invention, the overlapping portion of the through-connection portion in the internal conduction member overlaps the lower portion of the external terminal member, and the side surface of the bulging portion and the end portion of the overlapping portion are abutted and welded. The battery can be a butt welded battery.
Further, it can be easily determined from the appearance that the overlapping portion and the external terminal member are reliably welded.
Furthermore, since the dimension of the external terminal member interposed between the welded portion and the resin spacer made of an insulating resin can be secured, the transfer of heat to the resin spacer can be suppressed, and the resin spacer is altered by heat. And the battery case and the external terminal member can be reliably insulated.

  Another solution is a vehicle equipped with any of the above-described batteries.

  In the vehicle of the present invention, since the above-described battery is mounted, it is possible to provide a vehicle that secures the bonding strength between the external terminal member of the battery and the internal conductive member while suppressing the deterioration of the resin spacer.

  The vehicle may be a vehicle that uses electric energy from a battery for all or a part of its power source. For example, a hybrid vehicle, a plug-in hybrid vehicle, an electric vehicle, a plug-in electric vehicle, a hybrid railway Examples include vehicles, forklifts, electric wheelchairs, electric assist bicycles, and electric scooters.

  Furthermore, another solution is a battery-equipped device equipped with any of the batteries described above.

  Since the battery-equipped device of the present invention is equipped with the above-described battery, it can be a battery-equipped device in which the bonding strength between the external terminal member and the internal conductive member of the battery is secured while suppressing the deterioration of the resin spacer.

  The battery-equipped device may be any device equipped with a battery and using it as at least one of the energy sources. For example, a battery such as a personal computer, a mobile phone, a battery-driven electric tool, an uninterruptible power supply, Various household appliances, office equipment, and industrial equipment driven by

  Further, another solution includes: a power generation element; a battery case containing the power generation element; and an internal continuity disposed in the battery case and electrically connected to one electrode of the power generation element. An internal conductive member having a through-connection portion that penetrates the battery case and protrudes to the outside of the battery case; and the through-connection portion of the internal conductive member that is disposed outside the battery case. An external terminal member welded to form a welded portion melted together with the through-connecting portion of the internal conductive member by welding, and at least the welded portion of the battery case and the external terminal member A resin spacer interposed between the battery case and the battery case side, wherein the through-connecting portion is the battery case of the outer surface of the external terminal member. It includes an overlapping portion that overlaps the outer surface located on the opposite side of the facing surface, and irradiates the abutting portion between the overlapping portion and the external terminal member to radiate the energy beam into the overlapping portion and the external terminal member. It is a manufacturing method of a battery provided with the welding process which welds the said welding part to a formation form.

Since the battery manufacturing method of the present invention includes the above-described welding process, the energy required for welding can be reduced as compared with, for example, through welding that penetrates the overlapping portion and is welded to the external terminal member. It is possible to manufacture a battery in which the resin spacer is prevented from being deteriorated due to the heat.
In addition, it is possible to manufacture a battery that can be easily discriminated from the appearance that the overlapping portion and the external terminal member are reliably welded.

  Furthermore, in the battery manufacturing method described above, the external terminal member has, on the outer surface side, a bulging portion that bulges outward from a surrounding low-level portion and becomes a high level, and The overlapping portion of the through-connecting portion of the member overlaps the low-order portion of the external terminal member, and its end is abutted against the side surface of the bulging portion. It is preferable to use a battery manufacturing method in which the end portion of the overlapping portion and the bulging portion of the external terminal member are welded.

In the battery manufacturing method of the present invention, the overlapping portion is overlapped with the lower portion of the external terminal member, the side surface of the bulging portion and the end portion of the overlapping portion are butted, and these are welded together. Batteries can be manufactured.
Also, since the outer terminal member is welded to the bulging portion, the dimension of the external terminal member interposed between the welded portion and the resin spacer is smaller than when welding without providing the bulging portion. It can be secured. For this reason, the transmission of heat to the resin spacer can be suppressed, and a battery in which alteration of the resin spacer due to heat is further suppressed can be manufactured.

  Further, in any one of the above-described battery manufacturing methods, prior to the welding step, after the through-connection portion is penetrated through the battery case, a part of the through-connection portion is caulked and deformed, and the superposition is performed. It is good to set it as the manufacturing method of a battery provided with the superimposition part caulking formation process which forms a part.

  In the battery manufacturing method of the present invention, since the above-described overlapping portion caulking formation step is provided, an overlapping portion having an appropriate shape can be easily formed regardless of the shape of the through connection portion when the through connection portion is passed through the battery case. The formed battery can be manufactured.

(Embodiment 1)
Next, Embodiment 1 of the present invention will be described with reference to the drawings.
First, the battery 1 according to the first embodiment will be described. FIG. 2 is a perspective view of the battery 1 partially seen through. The battery 1 is a wound lithium ion secondary battery that includes a positive electrode terminal 20 and a negative electrode terminal 30 in addition to a power generation element 50 indicated by a broken line and a rectangular box-shaped battery case 10 that houses the power generation element 50. .

  Among them, the power generating element 50 is formed by winding a belt-like positive electrode plate 51 and a negative electrode plate 52 in a flat shape through a belt-like separator 53 made of polyethylene in the battery case 10 (see FIG. 2). . The positive electrode plate 51 is welded to the positive electrode terminal 20, and the negative electrode plate 52 is welded to the negative electrode terminal 30.

The battery case 10 includes a battery case body 11 and a sealing lid 12 each made of aluminum. Of these, the battery case body 11 has a bottomed rectangular box shape, and an insulating film (not shown) made of resin is pasted on the entire inner surface. In the battery case 10, an electrolyte (not shown) of an organic electrolyte obtained by adding a solute (LiPF ₆ ) to a mixed organic solvent of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) is liquid-tight. Is held in.

  Among these, the sealing lid 12 has a rectangular plate shape, closes the opening 11 </ b> A of the battery case body 11, and is welded to the battery case body 11. A positive electrode external terminal member 21 of the positive electrode terminal 20 and a negative electrode external terminal member 31 of the negative electrode terminal 30 are respectively arranged on the upper surface 12a of the sealing lid 12 facing upward in FIG. The sealing lid 12 has a case through hole 12K through which a positive electrode internal conduction member 25 and a negative electrode internal conduction member 35 described later can be inserted (see FIGS. 4 and 6). Further, a safety valve 71 having a rectangular plate shape is attached to the sealing lid 12.

  The positive electrode terminal 20 includes a positive electrode external terminal member 21 disposed outside the battery case 10 and a positive electrode internal conduction member 25 disposed mainly in the battery case 10 (see FIGS. 2, 3 and 4). As will be described later, the positive internal conductive member 25 protrudes through the positive external terminal member 21 through the undeformed positive through-connection portion 126 of the undeformed positive internal conductive member 125 before caulking deformation shown in FIG. Then, the distal end side of the undeformed positive through-hole connecting portion 126 is squeezed and deformed in a cross shape to the radially outer side DR of the axis XA.

The positive electrode internal conduction member 25 made of aluminum extends from the positive electrode internal terminal main body 29 located inside the battery case 10, penetrates the battery case 10, and protrudes outside the battery case 10. It has the positive electrode penetration connection part 26 connected with the external terminal member 21 (refer FIG. 4).
Among these, the positive electrode internal terminal main body 29 has a rectangular plate-shaped positive electrode case coupling portion 29F having a diameter larger than the case through hole 12K of the sealing lid 12, and the positive electrode plate of the power generation element 50 from the positive electrode case coupling portion 29F. A positive electrode current collector 29G that is bent toward 51 and welded to the positive electrode plate 51 is included (see FIG. 4). For this reason, the positive electrode internal conduction member 25 is electrically connected to the positive electrode plate 51 of the power generation element 50.

  Moreover, the positive electrode penetration connection part 26 is connected to the outside of the battery case 10 (sealing lid 12) connected to the cylindrical rod-like positive electrode terminal penetration part 28 formed through the positive electrode terminal through hole 22K of the positive electrode external terminal member 21. A positive electrode overlapping portion 27 that is exposed and caulked and is formed by pressing the positive electrode fixing portion 22 of the positive electrode external terminal member 21 toward the inside in the axis XA direction (downward in FIGS. 3 and 4) (FIG. 3). 4).

On the other hand, the positive electrode external terminal member 21 made of aluminum is bent in a crank shape as shown in FIG. 2, and has a positive electrode fixing portion 22 fixed to the sealing lid 12 and a positive electrode fastening portion 23 extending in parallel therewith. Have Among these, the positive electrode fastening part 23 has, for example, a fastening through hole 23H through which a bolt is inserted when the plurality of batteries 1 are connected through a bus bar (not shown).
The positive electrode fixing portion 22 includes a positive electrode fixing portion second surface 22B facing the upper surface 12a of the sealing lid 12 in the outer surface 21S of the positive electrode external terminal member 21, and the positive electrode fixing portion second surface 22B. It has a positive electrode fixing portion first surface 22A located on the opposite side, that is, facing upward in FIG. Further, in the vicinity of the center of the positive electrode fixing portion 22, a positive electrode terminal through hole 22K penetrating between the positive electrode fixing portion first surface 22A and the positive electrode fixing portion second surface 22B is formed (see FIG. 4).

  The positive electrode fixing portion 22 has a flat first flat surface portion 22X on the positive electrode fixing portion first surface 22A side, and also protrudes upward from the first flat surface portion 22X in FIG. A plurality of frustoconical positive electrode bulging portions 22T that are higher than the planar portion 22X (four in the first embodiment) are provided (see FIG. 3). The positive electrode bulging portion 22T includes a side surface (slope, conical surface) 22TF.

Specifically, the four positive electrode bulging portions 22T, 22T, 22T, and 22T are all equidistant from the positive electrode terminal through hole 22K (axis XA) of the positive electrode fixing portion 22 and are equally disposed in all directions. ing. On the other hand, the positive electrode overlapping portion 27 is formed by expanding the four arm portions 27H in a cross shape so as to extend between the positive electrode bulging portions 22T by caulking deformation. Thus, among the ends of the periphery of the cross-shaped positive electrode overlapping portion 27, the end portion 27R between the arm portions 27H is abutted with the side surface 22TF of the positive electrode bulging portion 22T.
In addition, since the positive electrode superimposing portion 27 has a cross shape unlike the negative electrode superimposing portion 37 described later, if the battery case 10 is visually observed from above in FIG. 2 (see FIG. 3B), the positive electrode superimposing portion is formed. It can be easily recognized that the positive electrode terminal 10 joined at the portion 27 is on the positive electrode (+ electrode) side.

  The positive electrode bulging portion 22T of the positive electrode fixing portion 22 is welded to the positive electrode overlapping portion 27 of the positive electrode penetration connecting portion 26 described above. Specifically, a positive electrode weld PP1 in which these are melted is formed between the positive electrode bulging portion 22T and the positive electrode overlapping portion 27 by welding using a laser beam EB described later. This positive electrode welded portion PP1 is formed by melting all of the interface between the positive electrode bulging portion 22T and the end portion 27R, and along the circumference of the side surface of the positive electrode overlapping portion 27 when viewed from above in FIG. An arc shape is formed (see FIGS. 3A and 3B).

The positive electrode welded part PP1 is located on the positive electrode fixing part first surface 22A side of the positive electrode fixing part 22, and the battery case 10 (sealing lid 12) side from the positive electrode welded part PP1, that is, the positive electrode fixing part. On the side of the positive electrode fixing portion second surface 22B of 22, a planar second flat surface portion 22 </ b> Y that contacts an insulating member 41 described below is located (see FIG. 4).
In addition, the positive electrode overlapping portion 27 formed by caulking deformation overlaps the first flat surface portion 22X of the positive electrode fixing portion 22, and the intermediate end portion 27R and the side surface 22TF of the positive electrode bulging portion 22T are butt welded. Become. For this reason, the joining strength between the positive electrode external terminal member 21 and the positive electrode overlapping portion 27 can be increased as compared with the case where these are joined only by caulking.

Further, an insulating member 41 is interposed between the sealing lid 12 and the positive electrode fixing portion 22 of the positive electrode external terminal member 21 (see FIGS. 2, 3 and 4). The insulating member 41 is made of an insulating resin (nylon in the first embodiment), and has a rectangular plate-shaped main body portion 42 and a ring-shaped protruding portion 43 that protrudes downward from the main body portion 42 in FIG. And a frame-like frame portion 44 protruding upward in FIG. 4 from the periphery of the main body portion (see FIGS. 4 and 7). Further, the main body portion 42 and the projecting portion 43 are perforated with insulating through holes 41K penetrating therethrough. The protruding portion 43 is loosely inserted into each case through hole 12K of the sealing lid 12 to position the insulating member 41.
Further, a gasket 45 is disposed between the sealing lid 12 and the positive electrode internal terminal main body 29 of the positive electrode internal conduction member 25. The gasket 45 is made of an annular and insulating synthetic rubber (in the first embodiment, ethylene-propylene-diene rubber) having a gasket through hole 45K. The gasket 45 is sandwiched between the sealing lid 12 and the positive electrode internal terminal main body 29 of the positive electrode internal conduction member 25 to seal between them.

In the battery 1 according to the first embodiment, since the positive electrode overlapping portion 27 and the positive electrode external terminal member 21 are butt welded, the positive electrode overlapping portion 27 is penetrated, and the first flat surface portion 22X of the positive electrode external terminal member 21 is inserted. The energy required for welding can be reduced as compared with the case of through welding. Therefore, the quality change of the insulating member 41 due to the heat of welding can be suppressed.
In addition, it can be easily determined from the appearance that the positive electrode overlapping portion 27 and the positive electrode external terminal member 21 are reliably welded.

Further, the positive electrode overlapping portion 27 overlaps the first flat surface portion 22X of the positive electrode external terminal member 21 (positive electrode fixing portion 22), while the end portion 27R therebetween protrudes from the side surface of the positive electrode bulging portion 22T protruding from the first flat surface portion 22X. Since it is butt welded to 22TF, the battery 1 is obtained by reliably welding the positive electrode external terminal member 21 and the positive electrode internal conduction member 25.
Also, among the positive electrode external terminal members 21, since welding is performed with the positive electrode bulging portion 22T protruding from the first flat surface portion 22X, compared to the case where welding is performed without providing the positive electrode bulging portion 22T, The dimension (thickness dimension) of the positive external terminal member 21 (second flat portion 22Y of the positive electrode fixing portion 22) interposed between the positive electrode welded portion PP1 and the insulating member 41 can be increased. For this reason, transmission of heat to the insulating member 41 can be suppressed, and alteration of the insulating member 41 due to heat can be further suppressed.

  Further, the positive electrode through connection portion 26 includes a positive electrode superimposing portion 27 that overlaps the positive electrode fixing portion first surface 22A of the positive electrode fixing portion 22. The positive electrode superimposing portion 27 is formed by caulking and deforming the tip side protruding outside the battery case 10 after passing the positive electrode penetration connecting portion 26 through the battery case 10. Thereby, the battery case 10 and the positive electrode external connection terminal 21 are fixed (see FIGS. 2, 3 and 4). For this reason, it can be set as the battery 1 which formed easily the positive electrode superimposition part 27 of a suitable shape irrespective of the shape of the positive electrode penetration connection part 26 when penetrating the positive electrode penetration connection part 26 in the battery case 10. FIG.

  On the other hand, the negative electrode terminal 30 is also composed of a negative electrode external terminal member 31 located outside the battery case 10 and a negative electrode internal conducting member 35 located mainly inside the battery case 10, similarly to the positive electrode terminal 20 (FIG. 2, 5, 6). The negative electrode internal conducting member 35 is not deformed after the undeformed negative electrode through-connection portion 136 of the undeformed negative electrode internal conducting member 135 before caulking deformation shown in FIG. The deformed negative electrode penetration connecting portion 136 is caulked and deformed by being expanded in a substantially elliptical shape on the radially outer side DR of the axis XB.

Similarly to the positive electrode side, the negative electrode internal conducting member 35 made of copper penetrates the negative electrode internal terminal main body 39 located inside the battery case 10 and the battery case 10, protrudes outside the battery case 10, and is external to the negative electrode. It has the negative electrode penetration connection part 36 connected with the terminal member 31 (refer FIG. 6).
Among these, the negative electrode internal terminal main body 39 includes a rectangular plate-like negative electrode case coupling portion 39F and a negative electrode current collecting portion 39G welded to the negative electrode plate 52 of the power generation element 50, similarly to the positive electrode side (see FIG. 6). For this reason, the negative electrode internal conduction member 35 is electrically connected to the negative electrode plate 52 of the power generation element 50.

  Further, the negative electrode penetration connecting part 36 is connected to the outside of the battery case 10 (sealing lid 12) connected to the columnar negative electrode terminal penetration part 38 formed through the negative electrode terminal through hole 32K of the negative electrode external terminal member 31. A negative electrode overlapping portion 37 that is exposed and crimped to press the negative electrode fixing portion 32 of the negative electrode external terminal member 31 inward in the axis XB direction (downward in FIGS. 5 and 6) (FIG. 5). 6).

On the other hand, the negative electrode external terminal member 31 made of copper has a negative electrode fixing portion 32 fixed to the sealing lid 12 like the positive electrode side, and a negative electrode fastening portion 33 including a fastening through hole 33H like the positive electrode side. (See FIG. 2).
Among these, the negative electrode fixing portion 32 includes, on the outer surface 31S of the negative electrode external terminal member 31, a negative electrode fixing portion second surface 32B facing the upper surface 12a of the sealing lid 12, and the negative electrode fixing portion second surface 32B. It has a negative electrode fixing portion first surface 32A located on the opposite side. Further, in the vicinity of the center of the negative electrode fixing portion 32, a negative electrode terminal through hole 32K is formed as in the positive electrode side (see FIG. 6).

The negative electrode fixing portion 32 has a flat first flat surface portion 32X on the negative electrode fixing portion first surface 32A side, and also bulges upward from the first flat surface portion 32X in FIG. There are a plurality of negative electrode bulge portions 32T (two in the first embodiment) that are higher than the plane portion 32X (see FIG. 5).
Among these, as shown in FIGS. 5A and 5B, the negative electrode bulging portion 32T of the first plane portion 32X has a U-shape (semi-annular shape) curved so as to surround the axis XB. The vertical cross section of this is a frustum shape having a trapezoidal shape (see FIG. 8A). The negative electrode bulge portion 32T includes a tapered side surface (slope) 32TF.

  Specifically, the two negative electrode bulge portions 32T and 32T are arranged so as to be curved so that each portion is equidistant from the negative electrode terminal through hole 32K (axis line XA) of the negative electrode fixing portion 32. On the other hand, the negative electrode overlapping portion 37 has a substantially elliptical shape formed by expanding two arm portions 37H on the long diameter side so as to extend between the negative electrode bulging portions 32T by caulking deformation. Accordingly, the short-diameter end portion 37R located on the short-diameter side of the peripheral edge of the negative electrode overlapping portion 37 is abutted with the side surface 32TF of the negative electrode bulge portion 32T.

  The negative electrode bulge portion 32T of the negative electrode fixing portion 32 is welded to the short-diameter end portion 37R of the negative electrode overlapping portion 37 described above. Specifically, a negative electrode welded portion PN in which these are melted is formed between the negative electrode bulging portion 32T and the short diameter end portion 37R by welding using a laser beam EB described later. The negative electrode welded portion PN is formed by melting all of the interface between the negative electrode bulging portion 32T and the short diameter end portion 37R, and is an arc along the curve of the negative electrode overlapping portion 37 as viewed from above in FIG. The shape is formed (see FIGS. 5A and 5B).

The negative electrode welded portion PN is positioned on the negative electrode fixing portion first surface 22A side of the negative electrode fixing portion 32, and the battery case 10 (sealing lid 12) side from the negative electrode welded portion PN, that is, the negative electrode fixing portion. On the negative electrode fixing portion second surface 32B side of 32, a planar second flat portion 32Y that contacts the insulating member 41 is located (see FIG. 6).
The negative electrode overlapping portion 37 formed by caulking deformation overlaps the first flat surface portion 32X of the negative electrode fixing portion 32, and has its short diameter end portion 37R and the side surface 32TF of the negative electrode bulging portion 32T butt-welded. . For this reason, the joining strength between the negative electrode external terminal member 31 and the negative electrode overlapping portion 27 can be increased as compared with the case where they are joined only by caulking.

In addition, an insulating member 41 having a main body portion 42, a protruding portion 43, and a frame portion 44 is interposed between the sealing lid 12 and the negative electrode fixing portion 32 of the negative electrode external terminal member 31 as in the case of the positive electrode side ( (See FIGS. 2, 5 and 6).
In addition, a gasket 45 is sandwiched between the sealing lid 12 and the negative electrode internal terminal main body 39 of the negative electrode internal conducting member 35 to seal the gap between them.

Thus, in the battery 1 according to the first embodiment, since the negative electrode overlapping portion 37 and the negative electrode external terminal member 31 are butt welded, the negative electrode overlapping portion 37 is penetrated and the first flat surface of the negative electrode external terminal member 31 is inserted. The energy required for welding can be reduced as compared with the case where the portion 32X is welded through. Therefore, as with the above-described positive electrode terminal 20 side, the deterioration of the insulating member 41 due to the heat of welding can be suppressed also on the negative electrode terminal 30 side.
Further, it can be easily determined from the appearance that the negative electrode superimposing portion 37 and the negative electrode external terminal member 31 are reliably welded.

The negative electrode overlapping portion 37 overlaps the first flat surface portion 32X of the negative electrode external terminal member 31 (negative electrode fixing portion 32), while the short diameter end portion 37R protrudes from the first flat surface portion 32X. It is butt welded to the side surface 32TF. For this reason, also on the negative electrode terminal 30 side, the battery 1 is obtained by reliably welding the negative electrode external terminal member 31 and the negative electrode internal conduction member 35.
Further, among the negative electrode external terminal members 31, since welding is performed with the negative electrode bulging portion 32T protruding from the first flat surface portion 32X, compared to the case where welding is performed without providing the negative electrode bulging portion 32T, The dimension (thickness dimension) of the negative electrode external terminal member 31 (the second flat surface portion 32Y of the negative electrode fixing portion 32) interposed between the negative electrode welded portion PN and the insulating member 41 can be increased. For this reason, transmission of heat to the insulating member 41 can be suppressed, and alteration of the insulating member 41 due to heat can be further suppressed.

  The negative electrode through connection part 36 includes a negative electrode overlapping part 37 that overlaps the negative electrode fixing part first surface 32 </ b> A of the negative electrode fixing part 32. The negative electrode overlapping portion 37 is formed by caulking and deforming the tip side protruding outside the battery case 10 after passing the negative electrode penetration connecting portion 36 through the battery case 10. Thereby, the battery case 10 and the negative electrode external terminal member 31 are fixed (see FIGS. 2 and 5). For this reason, it can be set as the battery 1 which formed the negative electrode superimposition part 37 of an appropriate shape easily irrespective of the shape of the negative electrode penetration connection part 36 when penetrating the negative electrode penetration connection part 36 in the battery case 10.

Next, a method for manufacturing the battery 1 according to the first embodiment will be described with reference to FIGS.
FIG. 7 is an exploded perspective view of the undeformed positive inner conductive member 125, the gasket 45, the sealing lid 12, the insulating member 41, and the positive external terminal member 21 before the caulking deformation, constituting the positive terminal 20 of the battery 1. Show.
Among these, the undeformed positive internal conductive member 125 includes the positive internal terminal main body 29 described above and a cylindrical undeformed positive through-hole connecting portion 126 extending from the positive internal terminal main body 29 in the axis XA direction. . Among these, the positive electrode current collector 29G of the positive electrode internal terminal main body 29 is welded to the positive electrode plate 51 of the power generation element 50, although not shown in FIG. In addition, the undeformed positive through-hole connecting portion 126 has a deformation hole 126H opened upward in FIG.

  First, as shown in FIG. 7, the undeformed positive through-hole connection 126 is formed by connecting the gasket through-hole 45K of the gasket 45, the case through-hole 12K of the sealing lid 12, the insulating through-hole 41K of the insulating member 41, and the positive external terminal member. 21 is inserted in this order into the positive electrode terminal through hole 22 </ b> K, and the tip end side thereof protrudes beyond the positive electrode external terminal member 21. FIG. 8A shows a cross-sectional view of the undeformed positive through-hole connecting portion 126 and its surroundings after insertion.

Next, in the manufacturing method of the battery 1, the overlapping portion caulking process on the positive electrode terminal 20 side will be described with reference to FIGS.
As shown in FIG. 8A, the diameter-enlargement die 151 having a substantially conical tip portion 151A is moved along the axis XA toward the deformation hole 126H of the undeformed positive through-hole connecting portion 126. At the same time, the flat mold 152 having the flat surface 152B is brought into contact with the lower side of the positive electrode case coupling portion 29F and moved toward the positive electrode external terminal member 21 along the axis XA.
Thereby, outside the positive electrode fixing | fixed part 1st surface 22A of the positive electrode external terminal member 21, it is set as the shape which the undeformed positive electrode penetration connection part 126 opened in the shape of a cone (conical cylinder shape) (refer FIG.8 (b)). ).

Further, as shown in FIG. 7, a portion of the undeformed positive through-hole connecting portion 126 that is located on the outer side (upward in FIG. 9) of the first flat surface 22 </ b> X of the positive electrode fixing portion first surface 22 </ b> A 153 is used for deformation. Specifically, while the pressing mold 153 is rotated along the axis XA, the portion positioned outside the positive electrode fixing portion first surface 22A is expanded to the radially outer side DR of the axis XA while the first plane Push down toward part 22X. Thereby, the positive electrode superposition part 27 formed by pressing the first flat surface part 22X is completed.
At this time, the intermediate end portion 27R of the positive electrode overlapping portion 27 is in contact with a part of the side surface 22TF of the positive electrode bulging portion 22T disposed on the positive electrode fixing portion first surface 22A (see FIG. 9). That is, the side surface 22TF of the positive electrode bulging portion 22T and the end portion 27R of the positive electrode overlapping portion 27 are in contact with each other in a state of abutting, and this portion is referred to as a butting portion JP1.
The arm portion 27H of the positive electrode overlapping portion 27 extends between the adjacent positive electrode bulging portions 22T and 22T, that is, between the intermediate end portions 27R and 27R toward the radially outer side DR of the axis XA, The positive electrode overlapping portion 27 itself has a cross shape (see FIG. 3B).

  Next, in the battery 1 manufacturing method, in the welding process on the positive electrode terminal 20 side, as shown in FIG. 10, the laser beam EB is irradiated from above to below in FIG. Butt welding. Thereby, the end portion 27R of the positive electrode overlapping portion 27 and the side surface 22TF of the positive electrode bulging portion 22T are melted to form the positive electrode welded portion PP1.

Since the manufacturing method of the battery 1 according to the first embodiment includes the above-described welding process, for example, the energy required for welding as compared to the case of penetrating and welding to the positive electrode external terminal member 21 through the positive electrode overlapping portion 27. Thus, it is possible to manufacture the battery 1 in which the deterioration of the insulating member 41 due to the heat of welding is suppressed.
Further, the positive electrode overlapping portion 27 is overlapped with the first flat surface portion 22X of the positive electrode external terminal member 21, and the side surface 22TF of the positive electrode bulging portion 22T and the intermediate end portion 27R of the positive electrode overlapping portion 27 are abutted to form an abutting portion. Since JP1 is welded, the battery 1 that has been butt welded reliably can be manufactured.
In addition, since the positive electrode external terminal member 21 is welded to the positive electrode bulging portion 22T, the distance between the positive electrode welding portion PP1 and the insulating member 41 is larger than that in the case where welding is performed without providing the positive electrode bulging portion 22T. The dimension (thickness dimension) of the intervening positive electrode external terminal member 21 (the second flat surface portion 22Y of the positive electrode fixing portion 22) can be increased. For this reason, the transmission of heat to the insulating member 41 can be suppressed, and the battery 1 can be manufactured in which the alteration of the insulating member 41 due to heat is further suppressed.

  Moreover, since the manufacturing method of the battery 1 according to the first embodiment includes the above-described overlapping portion caulking formation step prior to the welding step, when the positive electrode through connection portion 26 of the positive electrode internal conduction member 25 is passed through the battery case 10. Regardless of the shape of the positive electrode penetration connecting portion 26, the battery 1 in which the positive electrode overlapping portion 27T having an appropriate shape (cross shape in the first embodiment) is easily formed can be manufactured.

Next, FIG. 11 is an exploded perspective view of the undeformed negative electrode internal conductive member 135, the gasket 45, the sealing lid 12, the insulating member 41, and the negative electrode external terminal member 31 that constitute the negative electrode terminal 30 of the battery 1 before caulking deformation. The figure is shown.
Among these, the undeformed negative electrode internal conduction member 135 has the above-described negative electrode internal terminal main body 39 and a cylindrical undeformed negative electrode through connection part 136. Among them, the negative electrode current collector 39G of the negative electrode internal terminal main body 39 is already welded to the negative electrode plate 52 of the power generation element 50, although not shown in FIG. In addition, the undeformed negative electrode through-connection portion 136 is provided with a deformation hole 136H that opens upward in FIG.

  First, as shown in FIG. 11, the undeformed negative electrode through-connecting portion 136 includes a gasket through hole 45K of the gasket 45, a case through hole 12K of the sealing lid 12, an insulating through hole 41K of the insulating member 41, and a negative external terminal member. The negative electrode terminal through hole 32 </ b> K of 31 is inserted in this order, and the tip end side thereof is protruded from the negative electrode external terminal member 31.

Next, in the manufacturing method of the battery 1, an overlapping portion caulking formation process on the negative electrode terminal 30 side will be described with reference to FIGS.
As shown in FIG. 8A, similarly to the positive electrode side, the above-described enlarged diameter mold 151 is moved along the axis line XB toward the deformation hole 136H of the undeformed negative electrode penetration connecting portion 136. At the same time, the above-described planar mold 152 is brought into contact with the lower side of the negative electrode case coupling portion 39F and moved toward the negative electrode external terminal member 31 along the axis XB.
As a result, on the outer side of the negative electrode fixing portion first surface 32A of the negative electrode external terminal member 31, the undeformed negative electrode penetration connecting portion 136 is formed in a shape of a cone (conical cylindrical shape) (see FIG. 8B). ).

Further, as shown in FIG. 9, a portion of the undeformed negative electrode penetration connection portion 136 that is located outside (upward in FIG. 9) the first flat surface portion 32 </ b> X of the negative electrode fixing portion first surface 32 </ b> A is pressed. 153 is used for deformation. Specifically, while the pressing mold 153 is rotated along the axis XB, the portion positioned outside the negative electrode fixing portion first surface 32A is expanded to the radial outside DR of the axis XB while the first plane Push down toward part 32X. Thereby, the negative electrode superimposing portion 37 formed by pressing the first flat surface portion 32X is completed.
At this time, the short-diameter end portion 37R of the negative electrode overlapping portion 37 is in contact with a part of the side surface 32TF of the negative electrode bulging portion 32T disposed on the negative electrode fixing portion first surface 32A (see FIG. 9). That is, the side surface 32TF of the negative electrode bulging portion 32T and the short diameter end portion 37R of the negative electrode overlapping portion 37 are in contact with each other in a state of being in contact, and this portion is referred to as a butt portion JP2.
The arm portion 37H of the negative electrode overlapping portion 37 extends in a straight line from between the short diameter end portions 27R and 27R toward the radially outer side DR of the axis XA, and the negative electrode overlapping portion 37 itself has a substantially elliptical shape. Eggplant (see FIG. 5B).

  Next, in the manufacturing process of the battery 1, in the welding process on the negative electrode terminal 30 side, as shown in FIG. 10, the laser beam EB is irradiated from the upper side to the lower side in FIG. Butt welding. Thereby, the short diameter end portion 37R of the negative electrode overlapping portion 37 and the side surface 32TF of the negative electrode bulging portion 32T are melted to form the negative electrode welded portion PN.

In the manufacturing method of the battery 1 according to the first embodiment, since the above-described welding process is provided, the battery 1 in which the deterioration of the insulating member 41 due to the heat of welding is suppressed can be manufactured as in the positive electrode side.
In addition, the negative electrode overlapping portion 37 is overlapped with the first flat surface portion 32X of the negative electrode external terminal member 31, and the side surface 32TF of the negative electrode bulging portion 32T and the short-diameter end portion 37R of the negative electrode overlapping portion 37 are abutted to each other. Since the portion JP2 is welded, the battery 1 that has been butt welded reliably can be manufactured.
Moreover, since the dimension (thickness dimension) of the negative electrode external terminal member 21 (the second flat surface portion 32Y of the negative electrode fixing portion 32) can be increased as in the positive electrode side, the transfer of heat to the insulating member 41 can be suppressed. Thus, it is possible to manufacture the battery 1 in which the deterioration of the insulating member 41 due to heat is further suppressed.

  Similarly to the positive electrode side, the negative electrode overlapping portion 37T having an appropriate shape can be easily formed regardless of the shape of the negative electrode penetration connection portion 36 when the negative electrode penetration connection portion 36 of the negative electrode internal conduction member 35 is passed through the battery case 10. The battery 1 formed in the above can be manufactured.

  After the above-described welding process on the positive electrode terminal 20 side and the negative electrode terminal 30 side, the power generation element 50 connected to the sealing lid 12 via the internal conduction members 25 and 35 (the positive electrode current collector 29G and the negative electrode current collector 39G). Is inserted into the battery case body 11, and the sealing lid 12 and the battery case body 11 are welded and sealed. Then, after inject | pouring electrolyte solution from a liquid inlet (not shown), this is sealed. Thus, the battery 1 can be manufactured (see FIG. 2).

(Modification 1)
Next, the battery 201 according to the first modification of the present invention will be described with reference to FIGS.
In the battery 201 of the first modified embodiment, the form of joining of the external terminal member and the internal conductive member is different from that of the first embodiment described above, and the others are the same.
Therefore, different points will be mainly described, and description of similar parts will be omitted or simplified. In addition, about the same part, the same effect is produced. In addition, the same contents are described with the same numbers.

The battery 201 is a wound lithium ion secondary battery including a positive electrode terminal 220 (see FIG. 12).
The positive terminal 220 will be described with reference to FIG. 13 in which the R portion in FIG. 12 is enlarged. The positive terminal 220 includes a positive external terminal member 221 disposed outside the battery case 10 and a positive internal conduction member 225 disposed mainly inside the battery case 10 (see FIGS. 13 and 14). The positive internal conductive member 225 is not deformed after the undeformed positive through-hole connecting portion 126 of the undeformed positive internal conductive member 125 before caulking deformation shown in FIG. The difference from the first embodiment is that the deformed positive electrode penetration connecting portion 126 is squeezed and deformed in a disk shape on the radially outer side DR of the axis XA.

  Further, the positive electrode fixing portion 222 of the positive electrode external terminal member 221 made of aluminum is different from that of the first embodiment. Specifically, as shown in FIG. 15, the positive electrode terminal through-hole 222 </ b> K is included in the center, and a hollow portion 222 </ b> D that is recessed by one step inside the positive electrode fixing portion 222 from the positive electrode fixing portion first surface 222 </ b> A. The hollow portion 222D has a ring-shaped bottom surface 222J cut out at the center by the positive electrode terminal through hole 222K, and a tapered surface 222W between the bottom surface 222J and the positive electrode fixing portion first surface 222A. . The bottom surface 222J corresponds to the outer surface and the outer surface of the positive electrode fixing portion 222, like the positive electrode fixing portion first surface 222A.

The positive electrode overlapping portion 227 disposed inside the above-described hollow portion 222D is expanded in diameter by caulking deformation and is formed in a disk shape. Accordingly, the end portion 227R at the periphery of the positive electrode overlapping portion 227 is abutted with the tapered surface 222W of the recess portion 222D. Further, a ring-shaped positive electrode weld PP2 in which these are melted is formed between the positive electrode fixing portion 222 and the positive electrode overlapping portion 227 by welding using the laser beam EB.
The positive electrode overlapping portion 227 formed by caulking deformation is formed by butt welding the end portion 227R of itself and the tapered surface 222W of the positive electrode external terminal member 221 while overlapping the bottom surface 222J. For this reason, the bonding strength between the positive electrode external terminal member 221 and the positive electrode overlapping portion 227 is increased as compared with the case where these are bonded only by caulking.

Further, in the battery 201 according to the first modification, since the positive electrode overlapping portion 227 and the positive electrode external terminal member 221 are butt welded, the positive electrode overlapping portion 227 is penetrated, and this is recessed with the hollow portion 222D of the positive electrode external terminal member 21. The energy required for welding can be reduced as compared with the case of through-welding (bottom surface 222J). Therefore, the quality change of the insulating member 41 due to the heat of welding can be suppressed.
Further, it is possible to easily determine from the appearance that the positive electrode overlapping portion 227 and the positive electrode external terminal member 221 are reliably welded.

Next, a method for manufacturing the battery 201 according to the first modification will be described with reference to FIGS.
FIG. 15 is an exploded perspective view of the undeformed positive inner conductive member 125, the gasket 45, the sealing lid 12, the insulating member 41, and the positive external terminal member 221 before the caulking deformation, constituting the positive terminal 220 of the battery 201. Show.
First, as shown in FIG. 15, the undeformed positive through-hole connecting portion 126 includes a gasket through-hole 45K in the gasket 45, a case through-hole 12K in the sealing lid 12, an insulating through-hole 41K in the insulating member 41, and a positive external terminal member. It is inserted in this order into the positive electrode terminal through hole 222K of 221 and its tip side is protruded from the positive electrode external terminal member 221. FIG. 16A shows a cross-sectional view of the undeformed positive through-hole connecting portion 126 and its surroundings after insertion.

Next, in the manufacturing method of the battery 201, the overlapping portion caulking process on the positive electrode terminal 220 side will be described with reference to FIGS.
As shown in FIG. 16A, as in the first embodiment, the diameter-enlarged mold 151 is moved along the axis XA toward the deformation hole 126H of the undeformed positive through-hole connecting portion 126. At the same time, the planar mold 152 is brought into contact with the lower portion of the positive electrode case coupling portion 29F and moved toward the positive electrode external terminal member 221 along the axis XA.
As a result, the non-deformed positive through-hole connecting portion 126 is formed in an open shape (conical cylindrical shape) outside the positive electrode fixing portion first surface 222A of the positive electrode external terminal member 221 (see FIG. 16B). ).

Further, as shown in FIG. 16, a portion of the undeformed positive through-hole connecting portion 126 that is located outside (upward in FIG. 16) from the bottom surface 222 </ b> J of the recess 222 </ b> D is deformed using the pressing mold 153. Specifically, while the pressing mold 153 is rotated along the axis XA, a portion located outside the bottom surface 222J is expanded toward the outer side DR in the radial direction of the axis XA and pushed down toward the bottom surface 222J. Thereby, the positive electrode superimposing portion 227 formed by pressing the bottom surface 222J is completed.
At this time, the tapered surface 222W of the positive electrode external terminal member 221 and the end portion 27R of the positive electrode superimposing portion 227 are in contact with each other in a butted state, and this portion is referred to as a butted portion JP3.

  Next, in the manufacturing process of the battery 201, in the welding process on the positive electrode terminal 220 side, as shown in FIG. 18, the laser beam EB is irradiated from the upper side to the lower side in FIG. Butt welding. As a result, the end portion 227R of the positive electrode overlapping portion 227 and the portion of the positive electrode external terminal member 221 including the tapered surface 222W of the positive electrode fixing portion 222 are melted to form the positive electrode weld portion PP2.

Since the manufacturing method of the battery 201 according to the first modification includes the above-described welding step, the positive electrode overlapping portion 227 is penetrated, and this and the hollow portion 222D (bottom surface 222J) of the positive electrode external terminal member 21 are welded. Compared to the case, the energy required for welding can be reduced. Therefore, it is possible to manufacture the battery 201 that suppresses the deterioration of the insulating member 41 due to the heat of welding.
Further, the positive electrode overlapping portion 227 is overlapped with the bottom surface 222J of the hollow portion 222D of the positive electrode external terminal member 221, and the tapered surface 222W of the positive electrode external terminal member 221 and the end portion 227R of the positive electrode overlapping portion 227 are brought into contact with each other and welded. Therefore, it is possible to manufacture the battery 201 that has been reliably butt welded.

(Embodiment 2)
A vehicle 500 according to the second embodiment includes a plurality of the above-described batteries 1 (201). Specifically, as shown in FIG. 19, vehicle 500 is a hybrid vehicle that is driven by using engine 540, front motor 520, and rear motor 530 in combination. The vehicle 500 includes a vehicle body 590, an engine 540, a front motor 520, a rear motor 530, a cable 550, an inverter 560, and a battery pack 510 having a plurality of batteries 1 (201) therein. ing.

  Since the vehicle 500 according to the second embodiment is equipped with the battery 1 (201), the external terminal member 21 of the battery 1 (201) is suppressed while the deterioration of the insulating members 41 and 41 on the positive electrode and negative electrode sides is suppressed. It can be set as the vehicle which ensured the joint strength of 31 (221) and the internal conduction members 25 and 35 (225).

(Embodiment 3)
Further, the hammer drill 600 of the third embodiment is equipped with a battery pack 610 including the battery 1 (201) described above, and is a battery-equipped device having a battery pack 610 and a main body 620 as shown in FIG. is there. Battery pack 610 is housed in bottom 621 of main body 620 of hammer drill 600.

  Since the hammer drill 600 according to the third embodiment is equipped with the battery 1 (201), the external terminal member 21 of the battery 1 (201) is suppressed while suppressing the deterioration of the insulating members 41 and 41 on the positive electrode and negative electrode sides. , 31 (221) and the internal conductive members 25, 35 (225) can be provided as a battery-equipped device in which the bonding strength is secured.

In the above, the present invention has been described according to the first, second, third, and modified embodiments 1. However, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist thereof. Needless to say, this is applicable.
For example, in Embodiments 1 and 2 and Modification 1, the battery is a lithium ion secondary battery. However, the present invention is not limited to a lithium ion secondary battery, but may be any battery having an external terminal member and an internal conduction member. It can be applied to any type of battery. In Embodiment 1 and Modification 1, a lithium ion secondary battery using a wound-type power generation element has been shown. However, a plurality of positive electrode plates and a plurality of negative electrode plates are alternately arranged via separators. A lithium ion secondary battery using stacked power generation elements formed by stacking may be used.

  In Embodiment 1 and the like, the internal conductive member is directly joined (welded) to one electrode plate of the power generation element to conduct, but for example, a current collecting member separate from the internal conductive member is used as the electrode plate. The current collecting member and the internal conducting member may be connected to each other and indirectly conducted. Further, the resin spacer is made of an insulating resin (insulating member 41). For example, when there is no need for insulation between the external terminal member and the internal conductive member and the battery case due to the configuration of the battery. May be made of a resin capable of conducting the resin spacer. Furthermore, although a laser beam is used as the energy beam, for example, an electron beam, an ion beam, or the like may be used.

In the first embodiment and the first modified embodiment, the arc-shaped or annular welded portion is formed by melting all the interfaces (abutting surfaces) between the internal conduction member and the external terminal member. However, for example, a single-point welded portion formed by melting a part of the interface between the internal conductive member and the external terminal member may be used. In this case, one or a plurality of welds may be provided for one interface (see FIG. 21A).
In the first embodiment, two or four bulging portions are arranged in the external terminal member. For example, in addition to a single bulging portion, three or five or more bulging portions are arranged. A plurality of bulging portions may be arranged on the external terminal member (see FIG. 21B). Furthermore, although the positive electrode external terminal member and the negative electrode external terminal member have different forms, they may have the same form, for example, the form of the bulging portions of each other.

It is explanatory drawing of the battery derived from a prior art document. 3 is a partially transparent perspective view of the battery according to Embodiment 1. FIG. It is explanatory drawing of the battery concerning Embodiment 1, (a) is an expansion perspective view (P section of FIG. 2), (b) is a top view. It is sectional drawing (AA part of FIG. 3) of the battery concerning Embodiment 1. FIG. It is explanatory drawing of the battery concerning Embodiment 1, (a) is an expansion perspective view (N part of FIG. 2), (b) is a top view. It is sectional drawing (BB part of FIG. 5) of the battery concerning Embodiment 1. FIG. 6 is an explanatory diagram of a battery manufacturing method according to Embodiment 1. FIG. It is explanatory drawing of the superimposition part caulking formation process of the battery concerning Embodiment 1. FIG. It is explanatory drawing of the superimposition part caulking formation process of the battery concerning Embodiment 1. FIG. It is explanatory drawing of the welding process of the battery concerning Embodiment 1. FIG. 6 is an explanatory diagram of a battery manufacturing method according to Embodiment 1. FIG. 6 is a partially transparent perspective view of a battery according to a first modification. FIG. It is explanatory drawing of the battery concerning the modification 1, (a) is an expansion perspective view (R section of FIG. 12), (b) is a top view. It is sectional drawing (CC part of FIG. 13) of the battery concerning the modification 1. 6 is an explanatory diagram of a battery manufacturing method according to Modification 1. FIG. It is explanatory drawing of the superimposition part caulking formation process of the battery concerning the modification 1. FIG. It is explanatory drawing of the superimposition part caulking formation process of the battery concerning the modification 1. FIG. 6 is an explanatory diagram of a battery welding process according to a first modification. FIG. It is explanatory drawing of the vehicle concerning Embodiment 2. FIG. It is explanatory drawing of the hammer drill concerning Embodiment 3. FIG. It is explanatory drawing of the battery concerning a deformation | transformation form.

Explanation of symbols

1,201 battery 10 battery case 21,221 positive external connection terminal (external connection terminal)
21S, 221S outer surface 22A positive electrode fixing portion first surface (outer surface, outer surface)
22B, 222B Positive electrode fixing portion second surface (outer surface, surface facing the battery case)
22T Positive electrode bulge (bulge)
22TF Side 22X 1st plane part (low-order part)
22Y 2nd plane part (part located on the battery case side from the welded part)
25,225 Positive electrode internal conducting member (internal conducting member)
26,226 Positive electrode through connection (through connection)
27,227 Positive electrode superposition part (superposition part)
27R, 227R end portion 28 positive terminal penetration (terminal penetration)
31 Negative external connection terminal (external connection terminal)
31S Negative electrode external terminal outer surface (outer surface)
32A Negative electrode fixing part first surface (outer surface, outer surface)
32B Negative electrode fixing part second surface (outer surface, surface facing the battery case)
32T Negative electrode bulge (bulge)
32TF side surface 32X first plane part (low-order part)
32Y 2nd plane part (part located on the battery case side from the welded part)
35 Negative Electrode Internal Conducting Member (Internal Conducting Member)
36 Negative electrode through connection (through connection)
37 Negative electrode superposition part (superposition part)
37R Short-diameter end 38 Negative electrode terminal penetration (terminal penetration)
41 Insulating material (resin spacer)
50 Power generation element 51 Positive electrode plate (electrode)
52 Negative electrode plate (electrode)
222A Positive electrode first surface (outer surface (outside of connection terminal), outer surface)
222J Bottom (outside surface (outside of external connection terminal), outside surface)
500 Vehicle 510 Assembly battery (battery)
600 Hammer drill (battery equipped equipment)
610 Battery pack (battery)
EB laser beam (energy beam)
JP1, JP2, JP3 Butt part PN Negative electrode welded part (welded part)
PP1, PP2 Positive electrode welded part (welded part)

Claims (9)

Power generation elements,
A battery case containing the power generation element;
An internal conduction member disposed in the battery case and electrically connected to one electrode of the power generation element,
An internal conduction member that has a through-connection portion that penetrates the battery case and protrudes outside the battery case;
An external terminal member disposed outside the battery case and welded to the through-connection portion of the internal conduction member,
An external terminal member comprising a welded portion melted together with the through-connecting portion of the internal conductive member by welding;
A resin spacer interposed between the battery case and at least the portion of the external terminal member that is closer to the battery case than the welded portion;
The through connection is
Including an overlapping portion overlapping an outer surface located on the opposite side of the outer surface of the external terminal member from the surface facing the battery case;
The weld is
The battery formed in the said superimposition part and the said external terminal member by the butt welding of the said superimposition part and the said external terminal member using an energy beam. The battery according to claim 1,
The external terminal member is
On the side of the outer surface, it has a bulging portion that bulges outward from the surrounding low level portion and becomes high,
The overlapping portion of the through-connection portion of the internal conduction member is
Among the external terminal members, while overlapping with the lower portion,
A battery in which an end portion thereof is abutted against a side surface of the bulging portion and welded to the bulging portion. The battery according to claim 1 or 2,
The superposition part is a battery formed by caulking and deforming a part of the penetration connection part after the penetration connection part is penetrated through the battery case. Power generation elements,
A battery case containing the power generation element;
An internal conduction member disposed in the battery case and electrically connected to one electrode of the power generation element,
An internal conduction member that has a through-connection portion that penetrates the battery case and protrudes outside the battery case;
An external terminal member disposed outside the battery case and welded to the through-connection portion of the internal conduction member,
An external terminal member comprising a welded portion melted together with the through-connecting portion of the internal conductive member by welding;
A resin spacer interposed between the battery case and at least the portion of the external terminal member that is closer to the battery case than the welded portion;
The external terminal member is
Of the outer surface, on the side of the outer surface located on the opposite side to the surface facing the battery case, has a bulging portion that bulges outward from the surrounding lower level portion and becomes higher,
The through connection is
A terminal penetrating portion penetrating the external terminal member;
It has a form that is larger in diameter than the terminal penetrating portion, and overlaps with the outer side surface of the lower portion of the external terminal member, and its end is abutted against the side surface of the bulging portion And
The weld is
By using an energy beam, the butt welding of the end of the overlapping portion and the bulging portion of the external terminal member is formed in the overlapping portion and the external terminal member,
The resin spacer is
A battery made of an insulating resin and insulated between the battery case and the external terminal member. A vehicle equipped with the battery according to any one of claims 1 to 4. The battery mounting apparatus which mounts the battery of any one of Claims 1-4. Power generation elements,
A battery case containing the power generation element;
An internal conduction member disposed in the battery case and electrically connected to one electrode of the power generation element,
An internal conduction member that has a through-connection portion that penetrates the battery case and protrudes outside the battery case;
An external terminal member disposed outside the battery case and welded to the through-connection portion of the internal conduction member,
An external terminal member comprising a welded portion melted together with the through-connecting portion of the internal conductive member by welding;
A resin spacer interposed between the battery case and at least the portion of the external terminal member that is closer to the battery case than the welded portion, and a battery manufacturing method comprising:
The through connection is
Including an overlapping portion overlapping an outer surface located on the opposite side of the outer surface of the external terminal member from the surface facing the battery case;
A battery manufacturing method comprising: a welding step of irradiating an abutting portion between the overlapping portion and the external terminal member with an energy beam and welding the welded portion in a form of forming the overlapping portion and the external terminal member. . A battery manufacturing method according to claim 7,
The external terminal member is
On the side of the outer surface, it has a bulging portion that bulges outward from the surrounding low level portion and becomes high,
The overlapping portion of the through-connection portion of the internal conduction member is
Among the external terminal members, while overlapping with the lower portion,
Its own end is abutted against the side of the bulge,
The welding process includes
A battery manufacturing method for welding the end portion of the overlapping portion and the bulging portion of the external terminal member. A method of manufacturing a battery according to claim 7 or claim 8,
Prior to the welding process,
A battery manufacturing method comprising: an overlapping portion caulking forming step of forming the overlapping portion by caulking and deforming a part of the through connecting portion after passing the through connecting portion through the battery case.

Images