JP5217559B2 - Battery manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a battery formed by welding metal foils of a power generation element.

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 which a current collecting terminal member is fixed to a portion of a power generation element where metal foils are stacked in a battery case. For example, Patent Document 1 discloses a battery in which a positive electrode current collector (current collector terminal member) is welded to a part of a metal foil of a wound body (power generation element).

JP 2007-18968 A

However, when the current collecting terminal member is welded to the laminated metal foil in the manufacture of the battery described in Patent Literature 1, the metal foil and a portion other than the portion to be welded and the current collecting terminal member May come into contact. In this case, if current is passed between the two, the current flows in a diverted manner even through the above-described portion, and there is a possibility that spatter due to spark discharge occurs in the portion where the current is detoured.
On the other hand, since sufficient current does not flow between the portion of the metal foil where welding is planned and the current collecting terminal member, welding between the metal foils and welding between the metal foil and the current collecting terminal member are not performed. There is a possibility that it cannot be performed properly.
Even when the laminated metal foils are welded and then connected to the current collecting terminal member separately, the welding between the metal foils is performed between the metal foil and the current-carrying member energizing the metal foil. Similar problems can arise.

  This invention is made | formed in view of this problem, Comprising: When it energizes and welds the site | parts where welding is planned among the laminated | stacked metal foil, an electric current flows into the other site | part of metal foil. It is an object of the present invention to provide a method of manufacturing a battery that prevents the occurrence of the failure and performs appropriate welding.

  The means for solving the problem is a power generation element having an electrode body including an active material layer, a supporting region that supports the active material layer, and a metal foil that is not supported and includes a non-supporting region that is exposed to the outside. The non-supporting regions of the metal foils having the same polarity or the non-supporting regions of the same metal foil having the foil stacking portions stacked in the stacking direction are provided. The method for manufacturing a battery, wherein the foil laminate part includes a foil weld part formed by welding the stacked metal foils to each other, and among the foil laminate part, the foil side weld plan to be the foil weld part The pressed peripheral portion located around the pressing portion is pressed in the stacking direction by the pressing portion of the pressing member having a pressing portion made of an insulating material, and at least the pressed peripheral portion and the In the inner part, A pressing step in which the non-supporting regions of the metal foil are aligned with each other while being aligned in parallel with each other, and a current-carrying member for energizing the foil-side welding planned portion while performing the pressing, and the foil side of the metal foil A battery manufacturing method comprising: a welding step of energizing the foil-side welding scheduled portion through the energizing member to form the foil welded portion while separating a portion excluding the planned welding portion.

In the battery manufacturing method of the present invention, in the pressing step, the pressed peripheral portion is pressed by the pressing portion of the pressing member, and at least the pressed peripheral portion and the inner portion of the foil laminated portion are not covered with the metal foil. The supporting regions are brought into close contact with each other while being aligned in parallel with each other. Further, in the welding process, with such a press, the energization member is separated from the portion excluding the foil-side welding scheduled portion that is supposed to be the foil welded portion, and the foil-side welding is planned through the energizing member. Energize the part to form a foil weld.
In this way, by preventing the portion of the metal foil other than the foil-side welding scheduled portion from coming into contact with the current-carrying member, the current is bypassed and flows when the foil-side welding planned portion is energized. It can prevent and can form a foil welding part appropriately.

  In general, when a detour current is generated, the current flow path tends to become unstable at a portion where this current is detoured, so that sputtering due to spark discharge is likely to occur. On the other hand, in the present invention, by preventing the generation of the bypass current, the generation of the spatter can be suppressed, and the foreign matter accompanying the generation of the spatter can be suppressed.

Furthermore, in the pressing step, in the portion pressed by the pressing portion and the inner portion thereof, the non-supporting regions of the metal foil are aligned with each other while being aligned in parallel with each other. A current can flow stably.
In addition, the non-supporting regions of the metal foil are instable contact with each other around the portion to be welded on the foil side, current is diverted during welding, and spark discharge occurs between the non-supporting regions. Can also be prevented.
Thus, an appropriate foil weld can be formed stably.

  In addition, as a welding method, for example, the current-carrying member may be directly brought into contact with the foil-side welding scheduled portion to be energized, and the foil welded portion may be formed by spot welding. Further, for example, a current collecting terminal member is interposed between the current-carrying member and the foil-side welding scheduled portion, and the terminal-side welding planned portion of the current-collecting terminal member is brought into contact with the foil-side welding planned portion to energize. The foil welded portion may be formed, and the foil-terminal welded portion may be formed between the current collecting terminal member and the foil welded portion. In addition, as a welding technique in this case, for example, in addition to spot welding, solid phase bonding such as projection welding can be cited.

In the method for manufacturing a battery described above, the pressing member, as the pressing portion, a first pressing portion that presses the foil side welding scheduled portion of the foil stacking portion from one side in the stacking direction, and the above A second pressing portion that is pressed from the other side in the stacking direction, and the pressed peripheral portion of the foil stacking portion is pressed in the stacking direction by the first pressing portion and the second pressing portion in the pressing step. It is preferable to use a method for manufacturing a battery that is held between the two.
In this battery manufacturing method, in the pressing step, the pressed peripheral portion of the foil laminated portion is pressed and sandwiched between the first pressing portion and the second pressing portion in the laminating direction, so that the non-supporting regions of the metal foil are reliably secured. Can be brought into close contact with each other in parallel.

  Further, in the battery manufacturing method described above, the battery is in contact with the foil laminate portion from at least one direction of the lamination direction, and a foil-terminal weld portion is formed between the foil laminate portion and the foil. A current collecting terminal member fixed to the laminated portion, and the welding step separates the current collecting terminal member and the current-carrying member from a portion of the metal foil excluding the foil-side welding scheduled portion. However, the terminal-side welding planned portion that becomes the foil-terminal welding portion of the current collecting terminal member is brought into contact with the foil-side welding planned portion, and the terminal-side welding planned portion and the foil side are passed through the current-carrying member. It is good to set it as the manufacturing method of the battery which energizes to a welding scheduled part, forms the said foil-terminal welding part with the said foil welding part, and adheres the said current collection terminal member to the said foil lamination | stacking part.

In the battery manufacturing method of the present invention, in the welding process, while the pressing in the above-described pressing process is performed, the current collector terminal member and the current-carrying member are separated from the portion excluding the foil-side welding scheduled portion, and the foil- Contact the terminal-side welding planned portion scheduled to be the terminal welding portion with the foil-side welding scheduled portion, energize them, and form the foil-terminal welding portion together with the above-mentioned foil welding portion, The electric terminal member is fixed to the foil laminated portion.
In this way, by preventing the portion of the metal foil excluding the foil-side welding planned portion from contacting the current collecting terminal member in addition to the current-carrying member, it is possible to prevent the current from detouring and flowing to them, A foil-terminal welding part can be appropriately formed together with the foil welding part.

In the method for manufacturing a battery described above, the current collecting terminal member is a first terminal side welding planned portion that comes into contact with the foil laminated portion from the one side in the stacking direction as the terminal side welding planned portion, and The foil laminated portion has a second terminal side welding scheduled portion that comes into contact with the other side in the laminating direction, and the welding step includes the current collecting terminal member on the foil side welding planned portion of the foil laminated portion. The first terminal side welding planned portion and the second terminal side welding planned portion are brought into contact with each other to sandwich the foil side welding planned portion, and the first terminal side welding planned portion, the foil side welding planned portion, and the above It is preferable to use a method of manufacturing a battery that energizes the second terminal side welding scheduled portion.
In this battery manufacturing method, the foil-side welding scheduled portion is sandwiched between the first terminal-side welding scheduled portion and the second terminal-side welding scheduled portion, and electricity is passed through them. Electrical connection between the laminated portion (metal foil) and the current collecting terminal member can be ensured.

  Furthermore, in the battery described above, the terminal-side welding planned portion of the current collecting terminal member has a protruding portion that protrudes toward the foil-side welding planned portion of the foil laminate portion, and in the welding step, A method of manufacturing a battery in which the terminal-side welding scheduled portion and the foil-side welding scheduled portion are welded by projection welding in which current is applied while pressing the protrusion against the foil-side welding scheduled portion of the foil laminate portion may be used.

  In the battery manufacturing method of the present invention, since welding by projection welding is performed, the foil laminated portion (metal foil) and the current collecting terminal member having different thicknesses can be reliably welded (solid phase bonding).

  Furthermore, in any one of the above-described batteries, the welding step includes positioning the current collecting terminal member with respect to the current conducting member, and then holding the current collecting terminal member with the current conducting member, An abutting step of moving the current collecting terminal member held therein and bringing the terminal side welding planned portion of the current collecting terminal member into contact with the foil side welding planned portion of the foil laminated portion; And it is good to set it as the manufacturing method of the battery which has an electricity supply process energized between the said terminal side welding plan part and the said foil side welding plan part.

  In the battery manufacturing method of the present invention, after the current collecting terminal member is positioned with respect to the energizing member in the above-described abutting step, the current collecting terminal member is held by the energizing member and moved to abut against the foil-side welding scheduled portion. Therefore, the current collector terminal member can be prevented from being displaced relative to the current-carrying member, and the current collector terminal member and the foil laminated portion can be welded at an appropriate position.

  Furthermore, in any one of the above-described battery manufacturing methods, the pressing portion of the pressing member has a tip portion that abuts on the pressed peripheral portion and has a convex R shape in a radial section of the pressing portion. It is preferable to use a battery manufacturing method.

In the battery of the present invention, since the tip of the pressing portion has an R shape, even if the pressing portion is pressed against the pressed peripheral portion with a relatively small pressing force, the pressed peripheral portion is pressed with high pressure to While the non-carrying regions of the foil are aligned in parallel with each other, they can be brought into close contact with each other.
On the other hand, since the tip portion has a convex R shape, problems such as breakage (cut) due to pressing of the tip portion are less likely to occur in the pressed peripheral portion of the metal foil pressed against the tip portion.

  Furthermore, in any one of the above-described battery manufacturing methods, the pressing member is an annular pressing portion that annularly presses the pressed peripheral portion of the foil laminated portion, and the pressed portion is the pressing portion. In the state of pressing the peripheral portion, the wall portion extends from the pressing portion to the side away from the foil side welding planned portion in the stacking direction, and is in contact with the foil side welding planned portion from the stacking direction. It is preferable to use a method of manufacturing a battery having a wall portion surrounding at least the current collecting terminal member among the energizing member energizing the current collector or the current collecting member and the current collecting terminal member.

  In the battery manufacturing method of the present invention, the pressing member includes the annular pressing portion and the above-described wall portion. For this reason, in the welding process, even when a spark discharge occurs between the current-carrying member or the current collecting terminal member and the foil-side welding scheduled portion and spatter (metal fine particles) is generated, this spatter is generated on the pressing portion and the wall portion. It is possible to prevent the spatter from being mixed into each part in the battery by suppressing the scattering from the inside to the outside.

Specifically, when the energization member is brought into direct contact with the foil side welding scheduled portion and energized, the wall portion surrounds the energization member contacting the foil side welding scheduled portion. Even if spark discharge occurs between the two portions and spatter (metal fine particles) is generated, it is possible to suppress the spatter from being scattered outward from the pressing portion and the wall portion.
In addition, even when a current collecting terminal member is interposed between the current-carrying member and the foil-side welding scheduled portion, and the current-carrying terminal member is brought into contact with the foil-side welding scheduled portion and energized, the wall portion is at least on the foil side. Since the current collecting terminal member that contacts the planned welding portion is surrounded, even if a spark discharge occurs between the current collecting terminal member and the foil side welding planned portion and spatter occurs, the spatter is pressed and wall portions. It is possible to suppress the scattering outward.
Thus, in any case described above, it is possible to prevent spatter from being mixed into each part in the battery.

  Furthermore, in the battery manufacturing method described above, in the welding step, in the state where the pressed peripheral portion is pressed by the pressing portion of the pressing member, the foil laminated portion, the pressing portion of the pressing member, and The gas is supplied to the wall and the space surrounded by the current-carrying member or at least the current-collecting terminal member among the current-carrying member and the current-collecting terminal member, and the gas passing through the space is discharged. However, it is preferable to use a method of manufacturing a battery for performing the welding.

  In the battery manufacturing method of the present invention, even when a spark discharge occurs between the current-carrying member or current-collecting terminal member and the foil-side welding scheduled portion in the welding process and spatter occurs, this is placed on the gas flow. It is possible to suppress spatter from remaining in the space.

Specifically, when the energization member is in direct contact with the foil side welding scheduled portion and energized, even if a spark discharge occurs between this energizing member and the foil side welding scheduled portion and spatter occurs, This spatter can be discharged from the space on a gas flow.
In addition, when a current collecting terminal member is interposed between the current-carrying member and the foil-side welding scheduled portion and the current-carrying terminal member is brought into contact with the foil-side welding scheduled portion and energized, the current collecting terminal member and the foil are also used. Even if spark discharge occurs between the side welding scheduled portion and spatter is generated, the spatter can be discharged from the space on the gas.
Thus, in any case described above, it is possible to suppress spatter remaining in the space.
Note that gas may be injected into the space to increase the atmospheric pressure in the space and discharged to the outside, or the gas in the space may be sucked to a negative pressure and supplied from the outside.

(Embodiment 1)
Next, Embodiment 1 of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the battery 1 according to the first embodiment is a lithium ion secondary battery including a power generation element 10, a positive current collecting terminal member 20, a negative current collecting terminal member 30, and a battery case 50.

Among these, the battery case 50 includes a battery case main body 51, a sealing lid 52, a safety valve 57, and an insulating member 58.
The battery case body 51 is a bottomed rectangular container made of metal and having an open top. Further, the sealing lid 52 is provided with a safety valve 57 on its upper surface, and is arranged with the opening of the battery case body 51 closed. In the battery 1, the battery case body 51 and the sealing lid 52 liquid-tightly surround the power generation element 10, the positive current collecting terminal member 20, the negative current collecting terminal member 30, and an electrolyte solution (not shown).

The positive electrode current collector terminal member 20 made of metal is composed of two members, a positive electrode current collector terminal body member 21 and a positive electrode current collector terminal auxiliary member 22. Among these, the positive electrode current collecting terminal body member 21 has a shape bent in a crank shape. On the other hand, the positive electrode current collecting terminal auxiliary member 22 has a rectangular plate shape. The positive electrode terminal part 21p which is one edge part among the positive electrode current collection terminal main body members 21 penetrates the sealing lid 52, and protrudes upward in FIG. However, an insulating member 58 is interposed between the positive terminal portion 21p and the sealing lid 52 so as to be insulated from each other.
Similarly, the negative electrode current collector terminal member 30 includes two members, a negative electrode current collector terminal body member 31 and a negative electrode current collector terminal auxiliary member 32. Among these, the negative electrode current collector terminal body member 31 has a shape bent in a crank shape, while the negative electrode current collector terminal auxiliary member 32 has a rectangular plate shape. In the negative electrode current collector terminal body member 31, the negative electrode terminal portion 31 p which is one end portion also penetrates the sealing lid 52 with the insulating member 58 interposed between the sealing lid 52 and FIG. Projects upward.

  The power generation element 10 includes a strip-shaped positive electrode plate 11, a strip-shaped negative electrode plate 16, and a strip-shaped separator 19 (see FIG. 1). Specifically, the power generation element 10 includes a belt-like positive electrode plate 11 in which the positive electrode active material layer 13 is supported on both main surfaces of the belt-like positive electrode metal foil 12, and both main surfaces of the belt-like negative electrode metal foil 17. The strip-shaped negative electrode plate 16 carrying the negative electrode active material layer 18 is also strip-shaped, but is a wound type that is wound in a flat shape through a narrower separator 19 (see FIG. 2). ). The power generation element 10 has a laminated structure in which a positive electrode plate 11 and a negative electrode plate 16 are laminated via a separator 19 as shown in FIG.

  The positive electrode plate 11 includes a positive electrode foil carrying part 12c carrying a positive electrode active material layer 13 on both sides of the positive electrode metal foil 12, and a positive electrode foil in which the positive metal foil 12 itself is exposed to the outside without carrying the positive electrode active material layer 13. 12d (see FIGS. 3A and 3B). Among these, in the power generation element 10, the positive foil non-carrying portion 12 d extends from the first long end edge 19 a of the separator 19 to the outside (right direction in FIG. 1). This positive foil non-carrying part 12d is in a state in which a part of itself and another part are laminated together by winding. Furthermore, the positive electrode foil non-supporting portion 12d is sandwiched between the positive electrode main body contact portion 21A of the positive electrode current collector terminal main body member 21 and the positive electrode auxiliary contact portion 22A of the positive electrode current collector terminal auxiliary member 22, A positive electrode foil adhesion laminated portion 12L is formed in which a part and the other part are laminated in close contact with each other (see FIGS. 2 and 3A). Further, a part of the positive foil adhering laminated portion 12L, a part of the positive current collecting terminal main body member 21, and a part of the positive current collecting terminal auxiliary member 22 are welded to each other by projection welding, which will be described later. The positive electrode welded portion M1 is used (see FIGS. 2 and 3A). The positive electrode weld M1 is composed of a positive electrode foil-terminal weld M11 and a positive foil weld M12, which will be described later.

The strip-shaped negative electrode metal foil 17 is the same as the positive electrode metal foil 12 described above. That is, the negative electrode plate 16 has the negative electrode foil carrying part 17c carrying the negative electrode active material layer 18 on both sides of the negative electrode metal foil 17, and the negative electrode metal foil 17 itself exposed outside without carrying the negative electrode active material layer 18. And a negative electrode foil non-supporting portion 17d (see FIGS. 3A and 3B). Among these, in the power generation element 10, the negative electrode foil non-supporting portion 17 d extends from the second long end edge 19 b of the separator 19 to the outside (left direction in FIG. 1). The negative electrode foil non-supporting portion 17d is in a state in which a part of itself and the other part of the negative foil foil non-supporting portion 17d are laminated to each other by winding. Furthermore, the negative electrode foil non-supporting portion 17d is sandwiched between the negative electrode main body contact portion 31A of the negative electrode current collector terminal main body 31 and the negative electrode auxiliary contact portion 32A of the negative electrode current collector terminal auxiliary member 32, A negative electrode foil adhesion laminated portion 17L is formed in which a part and the other part are laminated in close contact with each other (see FIG. 3A). Furthermore, a part of the negative electrode foil adhesion laminated portion 17L, a part of the negative electrode current collector terminal body member 31, and a part of the negative electrode current collector terminal auxiliary member 32 are welded to each other to form an integral negative electrode weld part M2. (See FIG. 3A). The negative electrode weld M2 includes a negative electrode foil-terminal weld M21 and a negative electrode foil weld M22, which will be described later.

Next, a method for manufacturing the battery 1 according to the first embodiment will be described with reference to FIGS.
First, the belt-shaped positive electrode plate 11 and the negative electrode plate 16 are wound through a separator 19 to prepare the power generation element 10 formed in a flat shape shown in FIG. From the first long end edge 19a side of the separator 19, a positive foil non-carrying portion 12d of the positive metal foil 12 extends. Conversely, the negative electrode foil non-supporting portion 17 d of the negative electrode metal foil 17 extends from the other second long end edge 19 b side of the separator 19. Among these, the positive electrode foil non-supporting part 12d is adjacent to the other part with a gap, and overlaps in the stacking direction DL. The same applies to the negative electrode foil non-supporting portion 17d, and a part thereof and the other part overlap each other in the stacking direction DL.

  A pressing process in the manufacturing method of the battery 1 according to the first embodiment will be described with reference to FIG. In this pressing step, the positive electrode foil non-supporting portion 12d and the negative electrode foil non-supporting portion 17d of the power generation element 10 described above are pressed by the pressing members 80 made of insulating resin.

  First, the pressing member 80 will be described. The pressing member 80 includes a first pressing member 81 and a second pressing member 82. These press the positive foil surrounding part 12X located around the positive foil side planned part 12Y in the positive foil non-carrying part 12d. The positive foil side planned portion 12Y is a portion of the positive foil non-carrying portion 12d that becomes the positive electrode welded portion M1 described above by projection welding.

As shown in FIG. 4, the first pressing member 81 includes a first pressing main body member 81P bent into a U-shape and a rectangular bar-shaped first pressing plate member 81Q. The first pressing main body member 81P and the first pressing plate member 81Q are in contact with the positive foil surrounding portion 12X of the positive foil non-supporting portion 12d and press the first main pressing portion 81M and the first pressing pressing member 81M in the stacking direction DL. Each has a plate pressing portion 81N.
First, the first pressing body member 81P and the first pressing plate member 81Q are disposed adjacent to the first direction DA, and the first body pressing portion 81M and the first plate pressing portion 81N are combined in a rectangular ring shape. Therefore, the positive electrode foil peripheral portion 12X can be pressed in a rectangular ring shape along the stacking direction DL by the first pressing member 81.

  Moreover, the 2nd press member 82 which is a rectangular cylinder shape is contact | abutted to the positive electrode foil surrounding part 12X from the reverse direction to the above-mentioned 1st press member 81 among the lamination directions DL, and can press this on a rectangular ring shape It has the 2nd press part 82R. By this second pressing member 82, the positive electrode foil peripheral portion 12X can be pressed in a rectangular ring shape along the stacking direction DL.

  Similarly, the negative electrode foil non-supporting portion 17d is pressed using the third pressing member 83 and the fourth pressing member 84 for the negative electrode. That is, the third pressing member 83 has a symmetric form with the first pressing member 81 described above, and the third main body pressing portion 83M of the third pressing main body member 83P and the third plate of the third pressing plate member 83Q. By the pressing portion 83N, the negative electrode foil surrounding portion 17X can be pressed in a rectangular ring shape along the stacking direction DL. The fourth pressing member 84 has the same form as the second pressing member 82 described above, and the fourth pressing portion 84R presses the negative electrode foil peripheral portion 17X in a rectangular ring shape along the stacking direction DL. Can do.

  Furthermore, in addition to the first and third main body pressing portions 81M and 83M, the first and third pressing main body members 81P and 83P include the positive foil side planned portion 12Y and the negative foil side planned portion in the stacking direction DL. It has the 1st and 3rd main part wall part 81W and 83W located in the direction away from 17Y. The first and third main body wall portions 81W and 83W are, in addition to the positive electrode foil side planned portion 12Y and the negative electrode foil side planned portion 17Y, the positive electrode terminal side first planned portion 21G and the negative electrode terminal side 1 surrounding the planned portion 31G (see FIGS. 7 and 8). That is, the first and third main body wall portions 81W and 83W include the positive foil side planned portion 12Y and the positive terminal side first planned portion 21G, and the negative foil side planned portion 17Y and the negative terminal side first planned portion 31G. When welding, it surrounds so that spatter (metal fine particles) that may be generated between them can be prevented from being scattered outward.

  In addition to the second and fourth pressing portions 82R and 84R, the second and fourth pressing members 82 and 84 are further from the positive foil side planned portion 12Y and the negative foil side planned portion 17Y in the stacking direction DL. It has the 2nd, 4th wall part 82W and 84W located in the direction which leaves | separates. The second and fourth wall portions 82W and 84W are, in addition to the positive electrode foil side planned portion 12Y and the negative electrode foil side planned portion 17Y, a positive electrode terminal side second planned portion 22G and a negative electrode terminal side second, which will be described later. The planned portion 32G is surrounded (see FIG. 8). That is, the second and fourth main body wall portions 82W and 84W include the positive foil side planned portion 12Y and the positive terminal side second planned portion 22G, and the negative foil side planned portion 17Y and the negative terminal side second planned portion 32G. When welding, it surrounds so that the spatter which may generate | occur | produce between these can be suppressed outside.

In the pressing step according to the first embodiment, first, the pressing member 80 is pressed from both sides in the stacking direction DL toward the positive foil non-carrying portion 12d of the power generation element 10. Specifically, the first main body pressing portion 81M of the first pressing main body member 81P and the first plate pressing portion 81N of the first pressing plate member 81Q are connected to the positive foil non-carrying portion 12d from one direction in the stacking direction DL. It presses against the positive electrode foil peripheral part 12X (from the upper right to the lower left in FIG. 4). At this time, the first pressing plate member 81Q is arranged above the first pressing body member 81P in the first direction DA (upward in FIG. 4), and the first plate pressing portion 81N and the first body pressing portion 81M are annular. To be.
At the same time, the second pressing portion 82R of the second pressing member 82 is moved from the direction opposite to the first main body pressing portion 81M in the stacking direction DL to the positive foil peripheral portion 12X (in FIG. 4, from the lower left to the upper right direction). To face).

  Thus, the positive foil side planned portion 12Y and the positive foil peripheral portion 12X of the positive foil non-supporting portion 12d of the power generation element 10 are pressed from both sides of the stacking direction DL by the first pressing member 81 and the second pressing member 82, and The positive electrode foil adhesion laminate portion 12L is formed (see FIG. 5). In other words, in the positive electrode foil contact laminate portion 12L, the positive foil non-supporting portions 12d can be brought into close contact with each other while being reliably aligned in parallel with each other.

Similarly, the pressing member 80 is pressed from both sides of the lamination direction DL toward the negative electrode foil non-supporting portion 17d with respect to the negative electrode foil non-supporting portion 17d. Specifically, the third body pressing portion 83M of the third pressing body member 83P and the third plate pressing portion 83N of the third pressing plate member 83Q are connected to the negative electrode foil non-supporting portion 17d from one direction in the stacking direction DL. It is pressed toward the negative electrode foil peripheral portion 17X (from the upper right to the lower left in FIG. 4).
At the same time, the fourth pressing portion 84R of the fourth pressing member 84 is directed toward the negative electrode foil surrounding portion 17X from the direction opposite to the third main body pressing portion 83M in the stacking direction DL (from the lower left to the upper right in FIG. 4). Press it (towards the direction).

  Thereby, the negative electrode foil side scheduled portion 17Y of the negative electrode foil non-supporting portion 17d is pressed from both sides of the stacking direction DL by the third pressing member 83 and the fourth pressing member 84 to form the negative electrode foil adhesion stacked portion 17L (FIG. 5). reference). In other words, in the negative electrode foil contact laminate portion 17L, the negative electrode foil non-supporting portions 17d can be brought into close contact with each other while being reliably aligned in parallel with each other.

Next, the positive current collector terminal body member 21, the positive current collector terminal auxiliary member 22, the negative current collector terminal body member 31, and the negative current collector before welding used in the welding process of the manufacturing method of the battery 1 according to the first embodiment. The terminal auxiliary member 32 will be described with reference to FIGS.
Among these, the positive electrode current collecting terminal main body member 21 before welding to the positive electrode foil adhesion laminated portion 12L is made of copper and has a shape bent in a crank shape. Among these, one end becomes the positive electrode terminal portion 21p described above, and the other end becomes the positive electrode main body contact portion 21A. The central portion of the positive electrode main body abutting portion 21A is the positive terminal side first planned portion 21G that becomes the positive electrode welded portion M1 by welding. A conical projection 25 protrudes from the positive terminal side first planned portion 21G on the side in contact with the positive foil adhesion layered portion 12L (see FIGS. 6 and 8).

  Moreover, the positive electrode current collecting terminal auxiliary member 22 before welding is almost entirely the positive electrode auxiliary contact portion 22A described above. The central portion of the positive electrode auxiliary contact portion 22A is a positive terminal side second planned portion 22G that becomes the positive electrode weld portion M1 by welding. A conical projection 26 protrudes also on the side of the second terminal portion 22G on the positive electrode terminal side that comes into contact with the positive electrode foil adhesion laminated portion 12L.

  On the other hand, the negative electrode current collector terminal body member 31 bent in a crank shape is also the negative electrode terminal part 31p described above, and the other end is in contact with the negative electrode body, like the positive electrode current collector terminal body member 21. It becomes part 31A. The central portion of the negative electrode main body abutting portion 31A is a negative terminal side first planned portion 31G that becomes the negative electrode welded portion M2 by welding, and the negative foil terminal side first planned portion 31G of the negative electrode terminal side first planned portion 31G A conical projection 35 protrudes on the abutting side (see FIGS. 6 and 8).

  Also, the negative electrode current collector terminal auxiliary member 32 before welding is almost entirely the negative electrode auxiliary contact portion 32A, like the positive electrode current collector terminal auxiliary member 22. The central portion of the negative electrode auxiliary contact portion 32A is the negative terminal side second planned portion 32G that becomes the negative electrode welded portion M2 by welding, and the negative electrode terminal contact second planned portion 32G includes the negative electrode foil adhesion laminated portion 17L. A conical projection 36 protrudes on the abutting side (see FIGS. 6 and 8).

  First, the positive current collecting terminal main body member 21 is held by a rectangular bar-shaped first energizing terminal 91 connected to one pole of a power supply device (not shown). Specifically, the first current-carrying terminal 91 has a through hole 95 that opens in the tip surface 91K and penetrates along the stacking direction DL (see FIGS. 6 to 8). Therefore, the through-hole 95 is connected to a negative pressure, and the positive terminal side first planned portion 21G is sucked on the side where the projection 25 does not protrude and is held on the distal end surface 91K of the first energizing terminal 91. Further, the first energizing terminal 91 is movable in the laminating direction DL, and presses the projection 25 of the positive terminal side first planned portion 21G toward the positive foil side planned portion 12Y of the positive foil adhesion layered portion 12L. However, it can be energized.

  On the other hand, the positive current collecting terminal auxiliary member 22 is carried on a rectangular bar-shaped second energizing terminal 92 connected to the other pole of the power supply device (not shown). Specifically, the second energizing terminal 92 has a through-hole 96 that opens to the end surface 92K and penetrates along the stacking direction DL, like the above-described first energizing terminal 91 (FIG. 6). To FIG. 8). Therefore, the through hole 96 is connected to a negative pressure, and the positive terminal side second planned portion 22G is sucked on the side where the projection 26 does not protrude and is held on the distal end surface 92K of the second energizing terminal 92. Further, the second energizing terminal 92 is movable in the stacking direction DL, and presses the projection 26 of the positive terminal side second planned portion 22G toward the positive foil side planned portion 12Y of the positive foil adhesion layered portion 12L. However, it can be energized.

  Further, in the same manner as the positive electrode current collector terminal body member 21 and the positive electrode current collector terminal auxiliary member 22 described above, the negative electrode terminal side first scheduled portion 31G and the negative electrode terminal side second planned portion 32G are connected to one of the power supply devices (not shown). It is made to hold | maintain at the front end surface 93K of the 3rd electricity supply terminal 93 connected to the pole, and the front end surface 94K of the 4th electricity supply terminal 94 connected to the other pole (refer FIGS. 6-8).

  Next, in the contact step of the welding step, the first energization terminal 91 is moved. Specifically, the positive electrode terminal side first planned portion 21G of the positive electrode current collector terminal body member 21 is laminated together with the first energizing terminals 91 toward the positive foil side planned portion 12Y along the inside of the first pressing main body member 81P. Move in the direction DL (see FIG. 7). Then, the projection 25 of the positive electrode terminal side first planned portion 21G of the positive electrode current collector terminal main body member 21 is brought into contact with the positive electrode foil side planned portion 12Y of the positive electrode foil adhesion laminated portion 12L. As a result, only the projection 25 of the positive electrode current collector terminal body member 21 is brought into contact with the positive electrode foil adhesion laminate portion 12L (see FIG. 8A). That is, the positive electrode current collector terminal body member 21 and the first energization terminal 91 are separated from the portion of the positive electrode metal foil 12 excluding the positive electrode foil side planned portion 12Y.

At the same time, the second energizing terminal 92 is moved. Specifically, the positive electrode terminal side second planned portion 22G of the positive electrode current collecting terminal auxiliary member 22 is laminated together with the second energizing terminal 92 along the inner side of the second pressing member 82 toward the positive foil side planned portion 12Y. Move to DL (see FIG. 7). Then, the projection 26 of the positive electrode terminal side second planned portion 22G of the positive electrode current collecting terminal auxiliary member 22 is brought into contact with the positive electrode foil side planned portion 12Y of the positive electrode foil adhesion stacking portion 12L. Thus, only the projection 26 of the positive electrode current collecting terminal auxiliary member 22 is brought into contact with the positive electrode foil adhesion laminated portion 12L (see FIG. 8A). That is, the positive electrode current collecting terminal auxiliary member 22 and the second energizing terminal 92 are separated from the portion of the positive electrode metal foil 12 excluding the positive electrode foil side planned portion 12Y.

  Moreover, also about the negative electrode current collection terminal main body member 31, similarly to the above-mentioned positive electrode current collection terminal main body member 21, the projection 35 of the negative electrode terminal side 1st plan part 31G is used for the negative electrode foil side plan part of the negative electrode foil contact | adherence lamination | stacking part 17L. It is made to contact 17Y. Further, with respect to the negative electrode current collector terminal auxiliary member 32 as well as the positive electrode current collector terminal auxiliary member 22 described above, the projection 36 of the negative electrode terminal side second planned portion 32G is replaced with the negative electrode foil side predetermined portion 17Y of the negative electrode foil adhesion laminated portion 17L. Abut. Thereby, only the projections 35 and 36 of the negative electrode current collector terminal main body member 31 and the negative electrode current collector terminal auxiliary member 32 are brought into contact with the negative electrode foil adhesion laminated portion 17L.

Next, the energization process in the welding process will be described with reference to FIG.
After the contact step described above, the first energizing terminal 91 and the second energizing terminal 92 are pressed in the laminating direction DL toward the positive foil adhesion layer 12L (see FIG. 8A), A voltage is applied to the second energizing terminal 92 to perform projection welding.

Then, the projection 25 of the positive terminal side first planned portion 21G is crushed, and the positive terminal side first planned portion 21G of the positive current collector terminal body member 21 and the positive foil side planned portion 12Y of the positive foil adhesion layered portion 12L are welded ( Solid phase bonding) to form a positive foil-terminal weld M11. Thereby, the positive electrode current collecting terminal main body member 21 is fixed to the positive electrode foil adhesion laminated portion 12L.
At the same time, the projection 26 of the positive terminal side second planned portion 22G is crushed, and the positive terminal side second planned portion 22G of the positive current collecting terminal auxiliary member 22 and the positive foil side planned portion 12Y are welded (solid phase bonding). In the same manner as the positive terminal side first planned portion 21G, the positive foil-terminal welded portion M11 is formed. Thereby, the positive electrode current collecting terminal auxiliary member 22 is fixed to the positive electrode foil adhesion laminated portion 12L.

Furthermore, the positive foil side planned portion 12Y itself is welded. That is, the positive foil non-carrying portions 12d of the positive metal foil 12 constituting the positive foil side planned portion 12Y are welded to form the positive foil weld portion M12.
The two positive foil-terminal welds M11 and the positive foil weld M12 described above form an integral positive electrode weld M1 (see FIG. 8B). Moreover, the positive electrode current collection terminal member 20 is fixed to the positive electrode foil contact | adherence lamination | stacking part 12L of the electric power generation element 10 by the above-mentioned welding.

  Similarly, on the negative electrode side, after the above-described contact step, the third current terminal 93 and the fourth current terminal 93 and the fourth current terminal 94 are pressed in the stacking direction DL toward the negative foil adhesion layer 17L. A voltage is applied to the fourth energizing terminal 94.

Then, the projection 35 of the negative electrode terminal side first planned portion 31G is crushed, and the negative electrode terminal side first planned portion 31G of the negative electrode current collector terminal body member 31 and the negative electrode foil side planned portion 17Y of the negative electrode foil adhesion stacking portion 17L are welded ( Solid-phase bonding) to form a negative electrode foil-terminal weld M21. Thereby, the negative electrode current collection terminal main body member 31 is fixed to the negative electrode foil adhesion lamination part 17L.
At the same time, the projection 36 of the negative terminal side second planned portion 32G is crushed, and the negative terminal side second planned portion 32G of the negative current collector terminal auxiliary member 32 and the negative foil side planned portion 17Y are welded (solid phase bonding). Thus, the negative electrode foil-terminal welded portion M21 is formed in the same manner as the negative electrode terminal side first planned portion 31G. Thereby, the negative electrode current collection terminal auxiliary member 32 is fixed to the negative electrode foil adhesion laminated portion 17L.

Furthermore, the negative electrode foil side planned portion 17Y itself is welded. That is, the negative electrode foil non-supporting portions 17d of the negative electrode metal foil 17 constituting the negative electrode foil side planned portion 17Y are welded to form the negative electrode foil welded portion M22.
The two negative electrode foil-terminal welds M21 and the negative electrode foil weld M22 described above form an integral negative electrode weld M2. Moreover, the negative electrode current collection terminal member 30 is fixed to the negative electrode foil contact | adherence lamination | stacking part 17L of the electric power generation element 10 by the above-mentioned welding.

  As described above, in the first embodiment, the projections 25 and 26 are provided on the positive terminal first planned portion 21G and the positive terminal second planned portion 22G, and projection welding is performed using the projections 25 and 26. Different positive electrode foil adhesion lamination | stacking parts 12L, the positive electrode current collection terminal main body member 21, and the positive electrode current collection terminal auxiliary member 22 can be welded reliably. The same applies to the negative electrode side.

  In addition, during the energization step, the positive electrode current collector terminal main body member 21 in which the first main body wall portion 81W of the first pressing main body member 81P is in contact with the positive electrode foil side planned portion 12Y in addition to the positive foil side planned portion 12Y. (See FIG. 8). For this reason, when welding the positive electrode foil side planned portion 12Y and the positive electrode terminal side first planned portion 21G by projection welding, sputtering is performed between the positive foil side planned portion 12Y and the positive electrode current collector terminal body member 21 by spark discharge. Even if this occurs, it is possible to prevent the spatter from scattering outward from the first main body wall portion 81W. Therefore, it is possible to prevent spatter from being mixed into each part in the battery 1. The third main body wall 83W on the negative electrode side is the same as the first main body wall 81W described above.

  Further, the second wall portion 82W of the second pressing member 82P surrounds the positive electrode current collector terminal auxiliary member 22 in contact with the positive electrode foil side planned portion 12Y in addition to the positive electrode foil side planned portion 12Y (see FIG. 8). . For this reason, even when spatter occurs between the positive electrode foil planned portion 12Y and the positive electrode current collecting terminal auxiliary member 22 when welding the positive electrode foil side planned portion 12Y and the positive electrode terminal side second planned portion 22G, this spatter Can be prevented from scattering outward from the second wall portion 82W. Therefore, it is possible to prevent spatter from being mixed into each part in the battery 1. Note that the fourth wall portion 84W on the negative electrode side is the same as the second wall portion 82W described above.

  In the energization process, the positive foil side planned portion 12Y is sandwiched between the positive terminal side first planned portion 21G and the positive terminal side second planned portion 22G and energized through these, so It is possible to ensure electrical connection between the positive electrode foil adhesion laminated portion 12L (positive metal foil 12) and the positive current collecting terminal member 20 (positive current collecting terminal main body member 21, positive current collecting terminal auxiliary member 22) on both sides in the laminating direction DL. The same applies to the negative electrode side.

After the energization step, the suction through the through holes 95, 96, 97, and 98 is terminated, and the energization terminals 91, 92, 93, and 94 are connected to the positive current collector terminal member 20 (the positive current collector terminal body member 21, the positive electrode). The current collector terminal auxiliary member 22) and the negative current collector terminal member 30 (the negative current collector terminal main body member 31 and the negative current collector terminal auxiliary member 32) are separated from each other. Further, the periphery of the positive foil of the pressing member 80 (the first pressing body member 81P, the first pressing plate member 81Q, the second pressing member 82, the third pressing body member 83P, the third pressing plate member 83Q, the fourth pressing member 84). Separated from the portion 12X and the negative electrode foil surrounding portion 17X.
Since the first pressing plate member 81Q is sandwiched between the positive foil non-carrying portion 12d and the positive current collecting terminal body member 21, it is moved so as to be pulled out in the second direction DB. Similarly, the third pressing plate member 83Q is moved so as to be pulled out in the second direction DB.

  After the above-described welding process, the power generation element 10 is accommodated in the battery case main body 51. Furthermore, the positive electrode terminal portion 21p of the positive electrode current collector terminal body member 21 and the negative electrode terminal portion 31p of the negative electrode current collector terminal main body member 31 are respectively penetrated through the sealing lid 52, and an insulating member 58 is used between them. Seal. Further, the sealing lid 52 and the battery case body 51 are joined to form a battery case 50. After injecting an electrolytic solution (not shown) into the battery case 50, the safety valve 57 is attached to the sealing lid 52. Thus, the battery 1 according to the first embodiment is completed.

  In the manufacturing method of the battery 1 of the first embodiment, in the pressing step, the first main body pressing portion 81M, the first plate pressing portion 81N of the first pressing member 81 (first main body member 81P, first plate member 81Q), and The positive foil peripheral portion 12X was pressed by the second pressing portion 82R of the second pressing member 82. And in this positive electrode foil contact | adherence lamination | stacking laminated part 12L, in this positive electrode foil peripheral part 12X and the site | part (positive foil side planned part 12Y) inside, the positive electrode foil non-carrying parts 12d of the positive electrode metal foil 12 are mutually aligned in parallel. While closely contacting each other. Further, in the welding process, the first and second current-carrying members 91 and 92 and the portion of the positive electrode metal foil 12 excluding the positive electrode foil-side planned portion 12Y are separated from each other while keeping such a pressure. The positive electrode foil side planned portion 12Y was energized through the two energization members 91 and 92 to form the positive electrode foil welded portion M12 of the positive electrode welded portion M1.

  In this way, by preventing the portion of the positive electrode metal foil 12 excluding the positive electrode foil side planned portion 12Y from contacting the first and second current-carrying members 91 and 92, the positive electrode foil side planned portion 12Y is energized. In doing so, it is possible to prevent the current from detouring and flow, and to form the positive electrode foil weld M12 appropriately.

  In general, when a detour current is generated, the current flow path tends to become unstable at a portion where this current is detoured, so that sputtering due to spark discharge is likely to occur. On the other hand, in the first embodiment, by preventing the generation of the detour current, it is possible to suppress the generation of spatter and to prevent the spatter that is a foreign matter from being mixed into the battery 1.

  Furthermore, in the pressing step, the positive electrode non-supporting portions 12d of the positive electrode metal foil 12 are parallel to each other in the positive electrode foil peripheral portion 12X pressed by the first main body pressing portion 81M and the first plate pressing portion 81N and the inner portion thereof. Adhere to each other while aligning. Thereby, when it supplies with electricity to the positive electrode foil side scheduled part 12Y, an electric current can be sent stably.

Further, around the positive electrode foil side planned portion 12Y, the positive electrode non-supporting portions 12d of the positive electrode metal foil 12 are in contact with each other in an unstable manner, and the current is bypassed during welding, so that the positive electrode non-supporting portions 12d Spattering can also be prevented by spark discharge at.
Thus, the appropriate positive electrode foil welded part M12 can be formed stably.

Furthermore, in the manufacturing method of the battery 1 according to the first embodiment, the positive current collecting terminal member 20 (the positive current collecting terminal main body member 21 and the positive current collecting terminal auxiliary) is kept in the welding step while being pressed in the pressing step. In the state where the member 22) and the first and second current-carrying members 91 and 92 are separated from the portion of the positive electrode metal foil 12 excluding the positive electrode foil side predetermined portion 12Y, the positive electrode terminal side first predetermined portion 21G and the positive electrode terminal The side second planned portion 22G is brought into contact with the positive foil side planned portion 12Y and energized to form the positive foil-terminal welded portion M11 together with the positive foil welded portion M12. 30 is fixed to the positive electrode foil adhesion laminated portion 12L.
In this way, by preventing the portion of the positive electrode metal foil 12 other than the positive electrode foil side planned portion 12Y from contacting the positive current collector terminal member 30 in addition to the first and second current-carrying members 91 and 92, Thus, it is possible to prevent the current from detouring and flow to these, and to appropriately form the positive foil-terminal weld M11 together with the positive foil weld M12.

  Furthermore, in the manufacturing method of the battery 1 according to the first embodiment, the positive current collecting terminal member 20 (the positive current collecting terminal main body member 21 and the positive current collecting terminal auxiliary member 22) is attached to the first and first members in the contact step described above. 2 Positioning was performed with respect to the current-carrying members 91 and 92. Then, this positive electrode current collection terminal member 20 is hold | maintained by the 1st, 2nd electricity supply members 91 and 92, and these are moved, and are made to contact | abut to the positive electrode foil side scheduled part 12Y. Thus, the positive current collector terminal member 20 (the positive current collector terminal main body member 21 and the positive current collector terminal auxiliary member 22) with respect to the first and second current-carrying members 91 and 92 is prevented from being displaced at an appropriate position. The positive electrode current collecting terminal member 20 and the positive electrode foil adhesion laminated portion 12L can be welded.

  In addition, although the effect in the positive electrode side was shown among the manufacturing methods of the battery 1 of this Embodiment 1 above, it has the same effect also in the negative electrode side.

(Embodiment 2)
Next, a method for manufacturing the battery 1 according to the second embodiment will be described with reference to FIGS.
The manufacturing method of the second embodiment is different from the first embodiment described above in that the gas passing through the inside of the pressing member can be discharged.
Therefore, different points will be mainly described, and description of similar parts will be omitted or simplified, but similar functions and effects will occur for similar parts. In addition, the same contents are described with the same numbers.

Among the pressing members 180 used in the second embodiment, the first pressing main body member 181P and the second pressing member 182 extend toward the first main body wall portion 181W and the second wall portion 182W, as shown in FIG. The second embodiment is different from the first embodiment in that a cylindrical exhaust pipe portion 189 is provided.
Through this exhaust pipe portion 189, spatter or the like that is a foreign substance inside the first pressing body member 181P and the second pressing member 182 can be discharged to the outside.
Specifically, a suction device (not shown) is connected to the exhaust pipe portion 189, and the gas GS in the space SR inside the first pressing body member 181P and the second pressing member 182 is sucked through the exhaust pipe portion 189. As a result, an air flow of the gas GS flowing into the space SR from the outside and discharged from the exhaust pipe portion 189 is formed. Thereby, it is possible to discharge the spatter and the like from the space SR to the outside in the air stream.

  In the pressing step according to the second embodiment, as in the first embodiment, first, the pressing member 180 is placed on both sides in the stacking direction DL toward the positive foil non-supporting portion 12d and the negative foil non-supporting portion 17d of the power generation element 10. Are pressed to form the positive electrode foil contact laminate portion 12L and the negative electrode foil contact laminate portion 17L (see FIG. 10).

  Next, also in the contact step in the welding step according to the second embodiment, the first current-carrying terminal 91 is moved as in the first embodiment, and the positive-electrode terminal side of the positive-electrode current collecting terminal body member 21 held by the first current-carrying terminal 91 is held. The projection 25 of the first planned portion 21G is brought into contact with the positive foil side planned portion 12Y of the positive foil close contact laminate portion 12L (see FIGS. 10 and 11). At the same time, the second energization terminal 92 is moved, and the projection 26 of the second terminal portion 22G on the positive electrode terminal side of the positive electrode current collecting terminal auxiliary member 22 held by the second energization terminal 92 is moved to the positive electrode foil of the positive electrode foil adhesion laminated portion 12L. It is made to contact | abut to the side plan part 12Y.

  Further, also on the negative electrode side, as in the first embodiment, the projection 35 of the first negative electrode side first planned portion 31G is transferred to the negative electrode foil side planned portion 17Y of the negative electrode foil adhesion stacking portion 17L, and the negative electrode terminal side second planned portion 32G. The projections 36 are respectively brought into contact with the negative electrode foil-side planned portion 17Y of the negative electrode foil adhesion laminated portion 17L (see FIG. 10).

  Accordingly, as shown in FIG. 11, the first pressing body member 181P is surrounded by the inside of the first body wall portion 181W and the first current-carrying terminal 91 and the positive-electrode current collecting terminal body member 21 facing the inside. One space SR1 is provided. The first space SR1 communicates with the outside of the first pressing body member 181P through the exhaust pipe portion 189.

  Further, a second space SR <b> 2 surrounded by the inside of the second wall portion 182 </ b> W of the second pressing member 182 and the second energizing terminal 92 and the positive electrode current collecting terminal auxiliary member 22 facing the inside is provided. The second space SR2 communicates with the outside of the second pressing member 182 through the exhaust pipe portion 189.

  Thereafter, also in the second embodiment, the energization process is performed in the same manner as in the first embodiment. However, in the second embodiment, during the energization process, the gas GS in the first and second spaces SR1, SR2 in the first pressing body member 181P is discharged through the exhaust pipe portion 189 described above to generate an air flow. This is different from the first embodiment.

In the energization process according to the second embodiment, the gas GS flows through the first and second spaces SR1 and SR2 during the energization process using the above-described suction device (not illustrated), and the first process is performed as in the first embodiment. A voltage is applied between the energizing terminal 91 and the second energizing terminal 92.
At this time, spark discharge may occur between the positive electrode current collector terminal body member 21 and the positive electrode foil side planned portion 12Y, and the positive electrode current collector terminal auxiliary member 22 and the positive electrode foil side predetermined portion 12Y, thereby generating spatter. is there. Even in this case, since the gas GS in the first and second spaces SR1 and SR2 is discharged through the exhaust pipe 189 in the second embodiment, the generated spatter is put on the flow of the gas GS and the first and second spaces SR1 and SR2. It can be discharged from within SR2. Therefore, it is possible to suppress the spatter generated during energization from remaining in the first and second spaces SR1, SR2.

  In addition, although the effect in the positive electrode side was shown among the manufacturing methods of the battery 1 of this Embodiment 2 above, it has the same effect in the negative electrode side.

(Modification 1)
Next, a method for manufacturing the battery 1 according to the modification will be described with reference to FIG.
In the first embodiment described above, as shown in FIG. 8A, the first main body pressing portion 81M and the distal end portion 86T of the second pressing portion 82R in the first pressing main body member 81P and the second pressing member 82 of the pressing member 80. , 87T are in contact with the positive electrode foil adhesion laminated portion 12L on a flat surface.
On the other hand, in the manufacturing method of the first modification, the point that the tip of the pressing portion in the pressing member used in the pressing step has a convex R shape toward the foil laminated portion is the same as in the first embodiment. The rest is the same.
Therefore, different points will be mainly described, and description of similar parts will be omitted or simplified, but similar functions and effects will occur for similar parts. In addition, the same contents are described with the same numbers.

  FIG. 12 is a cross-sectional view taken along line EE of the power generation element 10 (see FIG. 5) in a state where it is pressed by the pressing member 280 in the pressing step. Of the pressing member 280 according to the first modification, as shown in FIG. 12, the first pressing main body member 281P and the second pressing member 282 are composed of the first main body pressing portion 281M and the second pressing portion 282R as the positive foil. It has a convex R shape with a semicircular cross section that protrudes toward the close-contact laminated portion 12L.

  In the battery 1 according to the first modification, the distal end portion 286T of the first main body pressing portion 281M and the distal end portion 287T of the second pressing portion 282R are each formed in an R shape. Even if the first main body pressing portion 281M and the second pressing portion 282R are pressed against the positive electrode foil adhesion laminate portion 12L, the positive electrode foil surrounding portion 12X of the positive electrode foil adhesion laminate portion 12L is pressed with a high pressure, and the positive electrode of the positive metal foil 12 The foil non-carrying portions 12d can be strongly adhered to each other while being aligned in parallel with each other.

  Further, since the tip portions 286T and 287T have a convex R shape, the positive electrode foil peripheral portion 12X of the positive electrode metal foil 12 pressed against the tip portions 286T and 287T breaks (breaks) due to the pressing of the tip portions 286T and 287T. ) And other problems are less likely to occur.

  In addition, although the effect in the positive electrode side was shown among the manufacturing methods of the battery 1 of this modification 1 above, it has the same effect also in the negative electrode side.

(Embodiment 3)
Next, Embodiment 3 will be described with reference to the drawings.
The battery 301 of the third embodiment is different from the first embodiment described above except that the foil non-supporting portions of the metal foils having the same polarity and different from each other have the foil adhesion laminated portions stacked on each other. .
Therefore, different points will be mainly described, and description of similar parts will be omitted or simplified, but similar functions and effects will occur for similar parts. In addition, the same contents are described with the same numbers.

  A battery 301 according to the third embodiment is a lithium ion secondary battery including a power generation element 310, a positive current collector terminal member 20, a negative current collector terminal member 30, and a battery case 350, as shown in FIG.

Among these, the battery case 350 includes a battery case main body 51, a sealing lid 352, a safety valve 57, and an insulating member 58.
Similar to the first embodiment, the sealing lid 352 includes a safety valve 57 on the upper surface thereof, and is disposed with the opening of the battery case body 51 closed.

  The power generation element 310 includes a rectangular planar positive electrode plate 311, a negative electrode plate 316, and a separator 319, respectively. Specifically, the power generation element 310 includes a positive electrode plate 311 having the positive electrode active material layer 13 supported on both main surfaces of the positive electrode metal foil 312, and a negative electrode active material layer 18 on both main surfaces of the negative electrode metal foil 317. The supported negative electrode plate 316 has a stacked structure in which the separator 319 is stacked in the stacking direction DL (see FIGS. 14 and 15).

Among these, the positive electrode plate 311 includes a positive electrode foil carrying part 312c in which the positive electrode metal foil 312 carries the positive electrode active material layer 13 and a positive electrode foil in which the positive electrode metal foil 312 itself is exposed to the outside without carrying the positive electrode active material layer 13. And a non-supporting portion 312d. Among these, the positive electrode foil non-supporting portion 312d extends from the first end edge 319a of the separator 319 toward the outside (rightward in FIG. 13) in the power generation element 310. This positive foil non-carrying part 312d is in a state of being laminated with the positive foil non-carrying part 312d of another positive metal foil 312.
Further, the positive electrode foil non-supporting portion 312d is sandwiched between the positive electrode main body contact portion 21A of the positive electrode current collector terminal main body member 21 and the positive electrode auxiliary contact portion 22A of the positive electrode current collector terminal auxiliary member 22, A plurality of positive foil non-carrying portions 312d are formed in close contact with each other to form a positive foil-adhered laminated portion 312L (see FIGS. 14 and 15A). Further, a part of the positive electrode foil adhesion laminated portion 312L, a part of the positive current collector terminal main body member 21, and a part of the positive current collector terminal auxiliary member 22 are welded together by projection welding to be integrated positive electrode welding. Part M1 (see FIGS. 14 and 15A). In addition, this positive electrode welding part M1 consists of positive electrode foil-terminal welding part M11 and positive electrode foil welding part M12.

The negative electrode plate 316 is similar to the positive electrode plate 311 described above. That is, the negative electrode plate 316 includes a negative electrode foil holding part 317c carrying the negative electrode active material layer 18, and a negative electrode foil non-carrying part 317d where the negative electrode metal foil 317 itself is exposed to the outside without carrying the negative electrode active material layer 18. Have Among these, the negative electrode foil non-supporting portion 317 d extends from the second end edge 319 b of the separator 319 toward the outside (left direction in FIG. 13) in the power generation element 310. This negative electrode foil non-supporting portion 317d is in a state of being laminated with the negative electrode foil non-supporting portion 317d of another negative metal foil 317.
Further, the negative electrode foil non-supporting portion 317d is sandwiched between the negative electrode main body contact portion 31A of the negative electrode current collector terminal main body 31 and the negative electrode auxiliary contact portion 32A of the negative electrode current collector terminal auxiliary member 32, A plurality of negative electrode foil non-carrying portions 317d are formed in close contact with each other to form a negative electrode foil adhesion laminated portion 317L (see FIG. 15A). Furthermore, a part of the negative electrode foil adhesion layered portion 317L, a part of the negative electrode current collector terminal main body member 31, and a part of the negative electrode current collector terminal auxiliary member 32 are welded to each other to form an integral negative electrode weld part M2. (See FIG. 15A). The negative electrode weld M2 includes a negative electrode foil-terminal weld M21 and a negative foil weld M22.

Next, a method for manufacturing the battery 301 according to the third embodiment will be described with reference to FIGS. 6 to 8, 16, and 17.
First, the power generation element 310 laminated in the lamination direction DL is prepared. Specifically, the power generating element 310 is formed by repeatedly laminating a rectangular flat plate-shaped separator 319, a positive electrode plate 311, a separator 319, and a negative electrode plate 316 in this order. From the first edge 319a side of the separator 319, the positive foil non-supporting portion 312d of the positive metal foil 312 and from the second edge 319b side of the separator 319, the negative foil non-supporting portion 317d of the negative metal foil 317 is provided. Each extends. Among these, the positive foil non-supporting portion 312d overlaps with the positive foil non-supporting portion 312d of the other positive metal foil 312 in the stacking direction DL. The same applies to the negative foil non-carrying part 317d, and overlaps with the other negative electrode foil non-carrying part 312d in the stacking direction DL.

  A pressing process in the manufacturing method of the battery 301 according to the third embodiment will be described with reference to FIG. In this pressing step, the positive foil non-supporting portion 312d and the negative foil non-supporting portion 317d of the power generating element 310 are pressed by the pressing member 80 of the first embodiment (see FIG. 16).

  The positive foil side planned portion 312Y and the positive foil surrounding portion 312X of the positive electrode foil non-supporting portion 312d of the power generation element 310 are pressed from both sides of the stacking direction DL by the first pressing member 81 and the second pressing member 82, and the positive foil described above. A close-contact laminated portion 312L is formed (see FIG. 17). That is, in this positive electrode foil adhesion lamination part 312L, the laminated positive electrode foil non-carrying parts 312d are laminated in parallel while being in close contact with each other, following the pressing parts 81M, 81N, and 82R that press in the lamination direction DL. .

  Further, the negative electrode foil-side scheduled portion 317Y of the negative foil non-supporting portion 317d is pressed from both sides of the stacking direction DL by the third pressing member 83 and the fourth pressing member 84 to form a negative foil close-contact stacked portion 317L (see FIG. 17). ). That is, in this negative electrode foil adhesion lamination part 317L, the laminated negative electrode foil non-carrying parts 317d are laminated in parallel while being in close contact with each other.

  Note that the welding process (contact process and energization process) of the method for manufacturing the battery 301 according to the third embodiment is the same as that of the first embodiment, and a description thereof will be omitted.

  After the above-described welding process, the positive electrode terminal portion 21p of the positive electrode current collector terminal main body member 21 and the negative electrode terminal portion 31p of the negative electrode current collector terminal main body member 31 pass through the sealing lid 352, respectively. Seal with an insulating member 58. Then, this is adhered and fixed to the sealing lid 352. Further, the power generation element 310 is accommodated in the battery case main body 51, and the sealing lid 352 and the battery case main body 51 are joined to form a battery case 350. After injecting an electrolytic solution (not shown) into the battery case 350, the safety valve 57 is attached to the sealing lid 352. Thus, the battery 301 according to the third embodiment is completed.

  In the manufacturing method of the battery 301 according to the third embodiment, in the pressing step, a portion of the positive electrode metal foil 312 excluding the predetermined portion 312 on the positive electrode foil side is prevented from contacting the first and second current-carrying members 91 and 92. Thus, when energizing the positive foil side planned portion 312Y, it is possible to prevent the current from detouring and flow, and to appropriately form the positive foil weld portion M12.

  In general, when a detour current is generated, the current flow path tends to become unstable at a portion where this current is detoured, so that sputtering due to spark discharge is likely to occur. On the other hand, in the third embodiment, by preventing the generation of the detour current, the generation of the spatter can be suppressed, and the spatter that is a foreign substance can also be suppressed from being mixed into the battery 301.

  Further, in the pressing process, the positive electrode non-supporting portions 312d of the positive electrode metal foil 312 are aligned in parallel with each other at the positive electrode foil peripheral portion 312X pressed by the first main body pressing portion 81M and the first plate pressing portion 81N and the inner portion thereof. Therefore, when the positive electrode foil side scheduled portion 312Y is energized, a current can be stably supplied.

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 Embodiment 1 or the like, the secondary battery is a lithium ion secondary battery, but may be applied to other secondary batteries such as a nickel hydrogen secondary battery, a nickel cadmium secondary battery, and the like. In the first embodiment and the like, the battery case of the battery is a rectangular container, but may be a cylindrical container or a laminate container.

  In the first embodiment and the like, the projection welding is used. However, for example, spot welding may be used. Moreover, although the positive electrode current collection terminal member 20 (or the negative electrode current collection terminal member 30) was made into the two members of the positive electrode current collection terminal main body member 21 and the positive electrode current collection terminal auxiliary member 22, for example, it bends itself and an electrode body is formed. It is good also as 1 member used as a form which can be clamped.

In Embodiment 1 or the like, as a welding method, a current collecting terminal member is interposed between the current-carrying member and the foil-side welding scheduled portion, and the terminal-side welding planned portion of the current collecting terminal member is scheduled to be foil-side welding. It was made to contact | abut to a part and it supplied with electricity and the foil-terminal welding part was formed with the foil welding part. However, for example, the current-carrying member may be directly brought into contact with the portion to be welded on the foil side for energization, and the foil welded portion may be formed by spot welding.
Specifically, as a contact process, as shown in FIG. 18, the first foil member 491 and the second energization member 491 are connected to the positive foil side welded portion 12Y of the positive foil adhesion layered portion 12L from both sides in the lamination direction DL. The energizing member 492 is brought into contact. Each of the first energizing member 491 and the second energizing member 492 has a protrusion TK that abuts on the positive foil side welding scheduled portion 12Y. The first pressing body member 81P and the second pressing member 82 separate the first and second current-carrying members 491 and 492 from the portion of the positive electrode metal foil 12 excluding the positive electrode foil side welding planned portion 12Y. .
Thereafter, with this process maintained, in the welding process, the positive foil side welding scheduled portion 12Y is energized through the first and second current-carrying members 491 and 492, and spot welding is performed. Thus, a positive foil weld is formed.

3 is a cross-sectional view of a battery according to Embodiment 1, Embodiment 2, and Modification 1. FIG. It is sectional drawing (AA part of FIG. 1) of the battery concerning Embodiment 1, Embodiment 2, and the modification 1. FIG. It is explanatory drawing of the battery concerning Embodiment 1, Embodiment 2, and the modification 1, (a) is sectional drawing (BB part of FIG. 1), (b) is an expanded sectional view (C part). It is explanatory drawing of the press process of Embodiment 1 and the modification 1. FIG. It is explanatory drawing of the press process of Embodiment 1 and the modification 1. FIG. 6 is an explanatory diagram of a contact process according to Embodiment 1. FIG. 6 is an explanatory diagram of a contact process according to Embodiment 1. FIG. 3 is an explanatory diagram of an energization process according to Embodiment 1. FIG. It is explanatory drawing of the press process of Embodiment 2. FIG. FIG. 10 is an explanatory diagram of a contact process according to the second embodiment. FIG. 10 is an explanatory diagram of an energization process of Embodiment 2. It is explanatory drawing of the press process of the deformation | transformation form 1. FIG. 6 is a cross-sectional view of a battery according to Embodiment 3. FIG. It is sectional drawing (FF part of FIG. 13) of the battery concerning Embodiment 3. It is explanatory drawing of the battery concerning Embodiment 3, (a) is sectional drawing (GG part of FIG. 13), (b) is an expanded sectional view (H part). It is explanatory drawing of the press process of Embodiment 3. FIG. It is explanatory drawing of the press process of Embodiment 3. FIG. It is explanatory drawing of the press process of a deformation | transformation form.

Explanation of symbols

1,301 Battery 10,310 Power generation element 11,311 Positive electrode plate (electrode body)
12,312 Positive electrode metal foil (metal foil)
12c, 312c Positive foil carrying part (carrying area)
12d, 312d Positive foil non-supporting part (non-supporting region)
12L, 312L Cathode foil adhesion lamination part (foil lamination part)
12X, 312X Positive foil periphery (pressed periphery)
12Y, 312Y Positive foil side planned part (foil side welding planned part)
13 Positive electrode active material layer (active material layer)
16,316 Negative electrode plate (electrode body)
17,317 Negative electrode metal foil (metal foil)
17c, 317c Negative foil carrying part (carrying area)
17d, 317d Negative foil non-supporting part (non-supporting region)
17L, 317L Negative electrode foil adhesion lamination part (foil lamination part)
17X, 317X Negative foil surrounding area (pressed area)
17Y, 317Y Negative foil side planned part (foil side welding planned part)
18 Negative electrode active material layer (active material layer)
19,319 Separator 20 Positive current collecting terminal member (current collecting terminal member)
21 positive electrode current collector terminal main body member 21A positive electrode main body contact portion 21G first positive terminal side planned portion (terminal side planned welding portion)
22 Positive Current Collection Terminal Auxiliary Member 22A Positive Auxiliary Auxiliary Contact Part 22G Positive Terminal Terminal Side Second Scheduled Part (Terminal Side Weld Scheduled Part)
25, 26, 35, 36 Projection (projection)
30 Negative current collecting terminal member (current collecting terminal member)
31 Negative electrode current collector terminal body member 31A Negative electrode body contact part 31G Negative terminal side first planned part (terminal side planned weld part)
32 Negative electrode current collecting terminal auxiliary member 32A Negative electrode auxiliary contact portion 32G Negative electrode terminal side second planned portion (terminal side welding planned portion)
50, 350 Battery case 51 Battery case body 52, 352 Sealing lid 80, 180 Press member 81, 181, 281 First press member (press member)
81M, 181M, 281M First body pressing part (pressing part)
81N 1st board press part (press part)
81P, 181P, 281P First pressing body member (pressing member)
81Q first pressing plate member (pressing member)
81W, 181W first body wall (wall)
82,182,282 Second pressing member (pressing member)
82R, 182R, 282R Second pressing part (pressing part)
82W, 182W Second wall (wall)
83,183 Third pressing member (pressing member)
83M, 183M Third body pressing part (pressing part)
83N 3rd board press part (press part)
83P, 183P Third pressing body member (pressing member)
83Q third pressing plate member (pressing member)
83W, 183W Third body wall (wall)
84,184 Fourth pressing member (pressing member)
84R, 184R Fourth pressing part (pressing part)
84W, 184W 4th wall (wall)
91,491 First energizing terminal (energizing member)
92,492 Second energizing terminal (energizing member)
93 3rd energizing terminal (energizing member)
94 4th energizing terminal (energizing member)
DL Laminating direction GS Gas M11 Positive electrode foil-terminal welded part (foil-terminal welded part)
M12 Positive foil weld (foil weld)
M21 Negative electrode foil-terminal weld (foil-terminal weld)
M22 Negative electrode foil welded part (foil welded part)
SR1 first space (space)
SR2 Second space (space)

Claims (7)

A power generation element having an electrode body including an active material layer, a supporting region that supports the active material layer, and a metal foil that is not supported and includes a non-supporting region that is exposed to the outside,
Production of a battery comprising: a power generation element having foil laminated portions in which the non-supporting regions of the metal foils having the same polarity or the non-supporting regions having the same metal foil are stacked in the stacking direction. A method,
The foil laminate is
Including a foil welded portion formed by welding the stacked metal foils together,
Among the foil laminated parts, the pressed peripheral part positioned around the foil side welding scheduled part that becomes the foil welded part is pressed in the laminating direction by the pressing part of the pressing member having a pressing part made of an insulating material. And
A pressing step in which the non-supporting regions of the metal foil are aligned with each other in parallel with each other at least in the peripheral portion to be pressed and the portion inside the foil laminated portion; and
While performing the above pressing,
While separating the current-carrying member energized to the foil-side welding scheduled portion and the portion of the metal foil excluding the foil-side welding scheduled portion,
A method of manufacturing a battery, comprising: a step of energizing the foil side welding scheduled portion through the energizing member to form the foil welded portion. A battery manufacturing method according to claim 1, comprising:
The battery is
A current collecting terminal member that is in contact with the foil laminate portion from at least one direction of the lamination direction, and is fixed to the foil laminate portion by forming a foil-terminal welded portion between the foil laminate portion,
The welding process includes
While separating the current collecting terminal member and the current-carrying member, and the portion excluding the foil-side welding scheduled portion of the metal foil,
Of the current collector terminal member, the terminal-side welding planned portion to be the foil-terminal welding portion is brought into contact with the foil-side welding planned portion,
The terminal-side welding scheduled part and the foil-side welding scheduled part are energized through the current-carrying member, the foil-welded part is formed together with the foil-welded part, and the current collecting terminal member is replaced with the foil-laminated part. A method of manufacturing a battery to be fixed to a battery. A method of manufacturing a battery according to claim 2,
The terminal side welding planned portion of the current collecting terminal member is:
Having a protrusion protruding toward the foil-side welding planned portion of the foil laminate,
In the welding process,
A battery manufacturing method for welding the terminal-side welding scheduled portion and the foil-side welding scheduled portion by projection welding in which current is applied while pressing the protrusion against the foil-side welding scheduled portion of the foil laminate. A method of manufacturing a battery according to claim 2 or claim 3,
The welding process includes
After positioning the current collecting terminal member with respect to the current-carrying member, the current-carrying member and the current-collecting terminal member held by the current-carrying member are moved while holding the current-collecting terminal member by the current-carrying member, An abutting step of abutting the terminal-side welding scheduled portion of the current collecting terminal member with the foil-side welding scheduled portion of the foil laminated portion, and
A method of manufacturing a battery, comprising: an energization step of energizing between the terminal-side welding scheduled portion and the foil-side welding scheduled portion. It is a manufacturing method of the battery according to any one of claims 1 to 4,
The manufacturing method of a battery, wherein the pressing portion of the pressing member has a convex R shape at a distal end portion that contacts the pressed peripheral portion in a radial section of the pressing portion. It is a manufacturing method of the battery of any one of Claims 1-5, Comprising:
The pressing member is
The annular pressing portion that annularly presses the pressed peripheral portion of the foil laminate, and
In the state where the pressed peripheral part is pressed by the pressing part, the wall part extends from the pressing part to the side away from the foil side welding scheduled part in the stacking direction,
Manufacture of a battery having the wall part surrounding at least the current collecting terminal member of the current carrying member that contacts the foil side welding planned part from the laminating direction and energizes this, or of the current carrying member and the current collecting terminal member Method. It is a manufacturing method of the battery of Claim 6, Comprising:
The welding process includes
In the state where the pressed peripheral portion is pressed by the pressing portion of the pressing member, the foil laminated portion, the pressing portion and the wall portion of the pressing member, the energizing member, or the energizing member and the collector While supplying gas to the space surrounded by at least the current collecting terminal member among the electric terminal members, and discharging the gas passing through the space,
A battery manufacturing method for performing the welding.

Images