JP2002231216A - Collector lead, storage battery using the same, and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sure and highly reliable collector lead eliminating welding failure by uniformizing a force acting on a welding point and to provide a storage battery using the same. SOLUTION: This collector lead is characterized in that a bending guide part for accelerating a local bending deformation in pressurization is provided by welding and sealing a collector lead between a terminal and electrodes and pressurizing a calking part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current collecting lead, a storage battery using the same, and a method of manufacturing the same. In particular, a current collector connected to at least one of a positive electrode and a negative electrode is connected to a sealing body. The present invention relates to improvement of a current collecting structure of a lead portion and a welding method thereof.

[0002]

2. Description of the Related Art Generally, an alkaline storage battery such as a nickel hydride storage battery or a nickel-cadmium storage battery has a separator interposed between a positive electrode and a negative electrode, and spirally winds them. After connecting the current collector to an electrode body, the electrode body is housed in a metal battery case as an outer container, and a current collecting lead extending from the current collector is welded to the sealing body. The battery case is hermetically sealed by being mounted on the opening of the battery case with an insulating gasket interposed therebetween.

[0003] Generally, alkaline storage batteries such as nickel-cadmium storage batteries and nickel-metal hydride storage batteries are formed by welding and connecting a current collecting lead, which is cut out from a current collector or led out by folding press molding, to a sealing member, and connecting the sealing member to an outer container. After being placed in the opening of the (battery case), the outer container is swaged and sealed.

[0004]

In particular, when such an alkaline storage battery is used for high-rate charging / discharging such as an electric tool or an electric vehicle, the current collector and the sealing member are particularly used in the battery structure. The electric resistance of the current collecting lead connecting between the bodies greatly affects the battery characteristics. Here, when the electric resistance of the current collecting lead is large, when discharging with a large current, there is a problem that a large voltage drop occurs due to the electric resistance of the current collecting lead and the battery voltage decreases. Therefore, a method has been proposed in which the thickness of the current collecting lead is made thicker and shorter to reduce the electrical resistance at the lead portion.

When the current collecting component constituting the current collecting lead is made thick and short, welding of the current collecting lead to the sealing member becomes difficult because the current collecting lead is not flexible, and the sealing member is connected to the opening of the outer container. At the same time, it is difficult to bend the current collecting lead when sealing the package, resulting in poor productivity. In addition, when the thickness of the current collecting component constituting the current collecting lead is increased, an ineffective current increases as a welding current for resistance welding, thereby deteriorating the weldability with the sealing body, and also reducing the sealing body of the outer container. When caulking in the opening, it is difficult to bend the current collecting lead, and the bending position may be uneven or stress may be applied in an oblique direction due to the uneven bending position as described above, and the welding point may be dislocated. The problem of occurrence was serious. Furthermore, there is a problem that it is difficult to bend and productivity is poor.

On the other hand, when the current collecting lead is welded to the sealing member, first, as shown in FIG. 23A, the sealing member 17 is made to be adjacent to the current collecting lead 200 vertically rising from the current collector 14 and collected. The welding electrode is pressed against the side of the current lead, and the current collecting lead is resistance-welded to the sealing body. Thereafter, the current collecting lead was bent, and the sealing body was attached to the opening of the outer container.
As shown in FIG. 3 (b), the end of the opening is caulked to seal. As is apparent from this figure, the use of a thick and short current collecting lead reduces the resistance and decreases the internal resistance of the battery.

However, as described above, in order to mount the sealing body to the opening of the outer container (battery case) after welding the current collecting lead to the sealing body, as shown in FIG.
It is necessary to attach the sealing body to the opening of the outer container so that the current collecting lead is bent at the time of sealing using a long current collecting lead. Therefore, the length of the current collecting lead needs to be a certain length in order to facilitate welding, and in order to bend the current collecting lead, a thin and long current collecting lead is not used. However, there has been a problem that the resistance increases and the internal resistance of the battery increases.

Accordingly, a connection method has been proposed in which the current collecting path is shortened to reduce the internal resistance of the battery (Japanese Patent Laid-Open No. 10-1998).
No. 261397). In this connection method, after the electrode body is housed in the outer container, the current collector lead welded to the current collector is brought into contact with the lower surface of the sealing member, and the opening of the outer container is sealed with the sealing member. By passing a current between the container and the sealing member, a contact portion between the current collecting lead and the sealing member is welded.

Thus, even if the current collecting lead is short, the sealing body can be easily attached to the opening of the outer container, and the current collecting distance can be shortened to reduce the internal resistance of the battery. In addition, since the current collecting lead does not need to be bent at the time of sealing, a thick current collecting lead can be used, and the internal resistance of the battery can be reduced.

However, the above-mentioned welding method (Japanese Unexamined Patent Publication No.
In the case of Japanese Patent Application Laid-Open No. 0-261397), there is a state where the contact portion between the sealing body and the current collecting lead cannot be reliably formed when the height of the electrode body accommodated in the outer container varies. However, there has been a problem that it is impossible to reliably form a weld. Further, there is also a problem that the welding point between the plate-like current collecting lead 200 and the sealing body 17 is unevenly applied in a diagonal direction or the like, and the welding point may be displaced due to a vibration or a temporal change. Further, there is another problem that the strength and quality of the welded point after welding are inferior and the product yield is reduced only by bringing the current collecting lead into contact with the sealing body.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has a uniform and uniform force acting on a welding point, has no welding loss, and has a reliable and highly reliable current collecting lead and a storage battery using the same. The purpose is to provide. It is another object of the present invention to provide a storage battery that can reliably weld a current collecting lead without any welding loss even if the thickness is large and the length is short, and that is excellent in high-rate discharge performance. Another object of the present invention is to provide a welding method capable of reliably connecting the current collecting lead and the sealing body or the current collecting lead and the current collector by welding using such a current collecting lead.

[0012]

In order to achieve the above object, according to a first aspect of the present invention, a current collecting lead interposed between a terminal and an electrode for connecting the terminal and the electrode is locally applied when pressurized. A bending guide portion for promoting bending deformation is provided. According to such a configuration, for example, after welding the current collecting lead between the terminal and the electrode, sealing, and when pressing and crimping the crimped portion by pressing, bending deformation occurs in the bending guide portion, so that it is determined in advance. It is possible to provide a highly reliable storage battery without being bent efficiently at the position where it is bent and without applying uneven stress in the oblique direction to the welding point. Further, by having the bending guide portion, the degree of elasticity (flexibility) is enhanced, the contact property with the welding point is enhanced, and reliable welding can be performed.

According to a second aspect of the present invention, the terminal and the electrode are interposed between the terminal and the electrode, and the terminal is welded to the current collecting lead. And a bending guide portion that promotes local bending deformation at the time of pressurizing by a pressure is provided. According to this configuration, the same operation and effect as those of the first embodiment are exerted.

A third aspect of the present invention is characterized in that the current collecting lead is constituted by a cylindrical body having a flat surface on a side peripheral surface, and a plurality of welding points are provided on the flat surface. According to this configuration, in addition to the above effects, since the welding surface is on a flat surface, reliable welding can be performed, and a correct horizontal state can be maintained before caulking. Without such a situation, it is possible to eliminate the deviation of the welding point.

According to a fourth aspect of the present invention, the current collecting lead is provided with two flat surfaces facing each other on the side peripheral surface, and the connection side with the electrode is connected to the connection side with the terminal among the two flat surfaces. It is characterized by comprising a cylindrical body having a larger surface area than that. According to such a configuration, in addition to the above-described effects, since both welding surfaces are on a flat surface, more reliable welding can be performed, and a correct horizontal state can be maintained before caulking. No stress is applied, and it is possible to prevent the welding point from coming off.

A fifth aspect of the present invention is characterized in that the current collecting lead has a symmetrical cross section parallel to the pressing surface. According to such a configuration, a more uniform pressure is applied more reliably, so that reliability can be improved.

A sixth aspect of the present invention is characterized in that the bending guide portion is constituted by a slit. According to such a configuration, the bending guide portion can be configured with a simple and simple structure.

According to a seventh aspect of the present invention, the bending guide portion is formed at a position symmetrical with respect to the welding point, and is a region (elastic portion) having higher flexibility than other regions. And According to this configuration, a reliable and uniform pressure is applied, and a more accurate horizontal state can be maintained before caulking, so that non-uniform stress in the oblique direction is not applied to the welding point, and the displacement of the welding point is eliminated. It becomes possible.

According to an eighth aspect of the present invention, the bending guide portion is a region provided with flexibility by a slit formed in a peripheral portion. With this configuration, it is possible to provide flexibility with a simple configuration, and it is possible to maintain a more horizontal surface by pressing even during welding.

According to a ninth aspect of the present invention, the bending guide portion is a thin portion formed at a position symmetrical with respect to the welding point. According to this configuration, the thin portion is deformed at the symmetrical position under pressure, so that a reliable and uniform pressure is applied, and a more correct horizontal state can be maintained before caulking. No stress is applied, and it is possible to prevent the welding point from coming off.

In a tenth aspect of the present invention, the current collecting lead comprises:
A welding surface having a region that can be a welding point on the surface, and at least two equal legs extending from the welding surface, wherein the bending guide portion is formed at an intermediate portion of the equal legs. Features.

According to an eleventh aspect of the present invention, the current collecting lead comprises:
A welding surface having a region that can be a welding point on the surface, and at least two legs of equal legs extending from the welding surface, wherein the bending guide portion is formed in an intermediate portion of the leg portion;
It is characterized in that it is a "ku" -shaped bent portion that is bent inward.

According to such a configuration, since a uniform stress is applied to the inside from the bent portion in the shape of the "ku" and the shape is deformed, a more accurate horizontal state can be maintained before swaging. In addition, non-uniform stress in the oblique direction is not applied to the welding point, and it is possible to prevent the welding point from coming off. In addition, since the current collecting lead itself has flexibility by the bending guide portion, the welding operation is reliable and highly reliable.

In a twelfth aspect of the present invention, the current collecting lead is
It is made of a circular metal plate, has a cut-and-raised portion protruding at the center, constitutes a flat surface having a region where the top surface of the cut-and-raised portion can be a welding point, and a bent guide portion is formed on the cut-and-raised portion. It is characterized by having been done. According to such a configuration, it is possible to easily form a reliable welding surface only by forming a cut-and-raised portion from one circular metal plate, and to achieve a reliable and highly reliable connection. In addition, according to this configuration, the current collector whose peripheral portion is connected to the electrode, the flat surface can serve as a current collecting lead connected to a terminal such as a sealing body, and thus can be integrally formed. Connection resistance can be reduced.

According to a thirteenth aspect of the present invention, the current collecting lead comprises:
A second flat surface formed by processing a circular metal plate into and out of shape, and having a peripheral portion formed of a first flat surface and a region protruding from the first flat surface and having a top surface serving as a welding point. It is characterized by having a convex region constituting a surface. According to such a configuration, similarly to the twelfth embodiment, the current collector and the current collecting lead can be integrally formed, and similarly, the connection which is easy to manufacture and has high reliability can be performed.

According to a fourteenth aspect of the present invention, the first flat surface is provided with a projection protruding to the rear surface side so as to be able to form a welding point with an electrode, and the second flat surface is a top surface. It is characterized in that it is provided with a projection protruding to the side, so that a welding point with the terminal can be formed. According to such a configuration, a projecting portion such as a punched-out bar can be used as a welding point, and easy and highly efficient and reliable welding can be performed.

[0027] In a fifteenth aspect of the present invention, the welding point is configured such that a region surrounded by two parallel slits formed on the second flat surface is projected by bending. And According to such a configuration, a projection serving as a welding point can be easily formed only by forming two slits.

According to the sixteenth to thirty-first aspects of the present invention, the outer container includes an outer container, positive and negative electrodes disposed in the outer container, and an electrolyte disposed therebetween. Is electrically connected to one of the positive or negative electrodes to form one terminal, and the other is connected to the other terminal electrically insulated from the outer container. Wherein at least one of the positive or negative electrode and the terminal are connected via a current collecting lead having a bending guide portion for facilitating local bending deformation when pressurized, and the bending guide It is characterized by being bent at the part.

According to such a configuration, for example, when the current collecting lead is welded between the terminal and the electrode, the sealing is performed, and when the caulking portion is pressed and pressed by the press, bending deformation occurs in the bending guide portion. It is possible to provide a highly reliable storage battery without being bent efficiently at a predetermined position and without applying uneven stress in the oblique direction to the welding point.

When the sealing member and the current collector (electrode) are welded to a current collector lead having a hollow and having a symmetrical cross section, a current path at the time of energization is the current path of the current collector lead. The current flows along the peripheral wall from the current collector to the sealing body (or from the sealing body to the current collector) in two paths, so that the current collecting distance of the current collecting lead is the distance of the leg of the current collecting lead. Thus, the voltage drop at the current collecting lead can be reduced to half. For this reason, since it is not necessary to increase the thickness of the base material constituting the current collecting lead, flexibility and elasticity are enhanced,
Even a slight displacement can be absorbed, and welding of the current collecting lead to the sealing member or the current collector becomes easy. Also,
The work of caulking the sealing body to the opening of the outer container is also easy, and the bending guide section by pressure so that the good bonding state near the welding point can be maintained even in the press-fitting process,
Bending deformation is generated, and the current collecting lead is maintained in a state where the welding surface is parallel to the current collector while maintaining the symmetric state in cross section, so that the welded portion can be favorably held. Therefore, the production of the storage battery becomes easy.

According to the method of manufacturing a storage battery of the present invention, a step of disposing positive and negative electrodes in an outer container provided with an opening also serving as a terminal of one electrode; A welding step of welding one end of a current collecting lead having a bending guide portion that facilitates easy bending deformation, and welding the other end of the current collecting lead to a sealing body also serving as the terminal of the other electrode; and Placing the sealing body in the opening,
A crimping step of crimping and sealing the outer container and crimping the current collecting lead so as to be bent at the bending guide portion.

Further, the method of manufacturing a storage battery according to the present invention may be arranged such that the current collector and the sealing member are brought into contact with each other via a current collecting lead for electrically connecting the current collector and the sealing member. An arranging step of arranging the sealing body at the opening of the container, and a welding step of flowing a welding current between the outer container and the sealing body to weld the current collecting lead to either the sealing body or the current collector; and A crimping step of crimping and sealing the outer container and crimping so that the current collecting lead is bent by a bending guide portion provided at a predetermined position in advance is provided.

According to such a configuration, for example, when the current collecting lead is welded between the terminal and the electrode, the sealing is performed, and when the caulking portion is pressed and pressed by the press, bending deformation occurs in the bending guide portion. It can be bent efficiently at a predetermined position, does not apply uneven stress in the oblique direction to the welding point, and is crimped while maintaining a good welding condition, so it has high impact resistance and reliability It is possible to provide a highly reliable storage battery.

Here, in the case of the direct welding method in which welding is performed after the sealing member is mounted, in order to increase the strength of the welded portion by resistance welding, the pressing force applied to the welding point is an important factor in addition to the current value of the welding current. Becomes When a welding current is applied to the welding point, the metal at the contact portion is melted and joined by Joule heat at the welding point, but if the welding point is not pressurized, a phenomenon occurs in which the molten metal is scattered. Dust occurs, which is one of the causes of battery short circuit. If the welding point is not pressurized, an internal defect occurs at the welding point, and the welding strength is reduced.

However, in the above-described welding method (Japanese Patent Laid-Open No. 10-261397), welding is performed after the opening of the outer container is sealed with the sealing member, so that the sealing member is fixed. As a result, there is a problem that a pressing force cannot be applied to a welding point at the time of welding, and "welding dust" and internal defects occur.

However, in the present invention, since the current guiding lead is formed with the bending guide portion in advance, the current collector and the sealing member come into contact with each other with good contact through the current collecting lead. As described above, the sealing body can be arranged at the opening of the outer container and the welding current is caused to flow between the outer container and the sealing body. Pressurization becomes possible. As a result, the current collecting lead can be satisfactorily welded to one or both of the sealing member and the current collector without generating “welding dust”. Therefore, the current collecting lead is welded to the sealing member or the current collector if the current collecting lead is long enough to make the sealing member contact the current collector. And
Even in the process of caulking and sealing the outer container, more accurate horizontal state can be maintained, reliable welding is possible, and even when caulking, uneven stress in the oblique direction is not applied to the welding point, and the welding point It is possible to eliminate the loss and improve the yield.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where the present invention is applied to a nickel-hydrogen storage battery will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a main part of a nickel-hydrogen storage battery equipped with a current collecting lead of the present invention, and FIG. 2 is a plan view and a cross-sectional view, which are made of a nickel-plated iron plate and have a substantially disk shape. Cut-and-raised portions 22a, 22a, which are leg portions formed opposite to each other at the center portion.
2b, a flat surface 23 having a region where a top surface of the cut and raised portion can be a welding point, and a bending guide portion 25 is formed on the cut and raised portion 22a, 22b. The current collecting lead 20 is formed by integrally forming a current collector body 21 connected to the positive electrode and the lead. FIG. 3 is a cross-sectional view showing a state where the electrode body is inserted into the outer container and welded to the sealing body via the current collecting lead 20. FIG. 4 is a cross-sectional view showing a state in which a sealing body is sealed in the opening of the outer container, and FIG. 5 is a cross-sectional view showing a state in which the sealing part is pressed.

FIG. 6 is a sectional view showing a completed nickel-hydrogen storage battery in which the electrode body inserted into the battery case is welded to the sealing body. According to such a configuration, it is possible to easily form a reliable welding surface only by forming a cut-and-raised piece from one circular metal plate, and to achieve a reliable and highly reliable connection. In addition, the peripheral portion can function as a current collector connected to the electrode, and the flat surface can function as a current collector lead connected to a terminal such as a sealing member. It becomes possible to plan.
The current collecting lead has at least two of a welding surface having a region that can be a welding point on the surface and an equal leg extending from the welding surface.
The bending guide portion is a bent portion formed in the middle of the leg portion and bent inward to form a "<" shape. With such a configuration, a uniform stress is applied to the inside from the bent portion in the shape of the "ku" and the shape is deformed, so that a more correct horizontal state can be maintained before caulking, and the welding point can be inclined obliquely. The non-uniform stress is not applied, and the welding point can be prevented from coming off, and more reliable connection can be achieved.

Next, a nickel-hydrogen storage battery formed using this current collecting lead will be described.

1. Production of Electrode Body As shown in FIGS. 3 to 6, the nickel-hydrogen storage battery of this embodiment has a nickel positive electrode plate 11 and a hydrogen storage alloy negative electrode plate 12.
And The nickel positive electrode plate 11 is formed by forming a nickel sintered porous body on the surface of an electrode core made of punched metal, and then filling the nickel sintered porous body with an active material mainly composed of nickel hydroxide by a chemical impregnation method. Have been made. On the other hand, the hydrogen-absorbing alloy negative electrode plate 12 is prepared by filling a paste-like negative-electrode active material made of a hydrogen-absorbing alloy on the surface of an electrode plate core made of punching metal, drying it, and rolling it to a predetermined thickness. Have been.

A spiral electrode group was produced by spirally winding the nickel positive electrode plate 11 and the hydrogen storage alloy negative electrode plate 12 with a separator 13 interposed therebetween. At the upper end surface of the spiral electrode group, an end of a punched metal which is an electrode plate of the nickel positive electrode plate 11 is exposed, and at the lower end surface thereof is an electrode plate of the hydrogen storage alloy negative electrode plate 12. The end of the punching metal is exposed. Then, a disk-shaped current collector body 21 having a large number of openings is welded to the positive electrode core exposed at the upper end surface of the spiral electrode group, and a large number of openings are formed at the negative electrode core exposed at the lower end surface. The disk-shaped negative electrode current collector 15 was welded to produce the spiral electrode body 10.

2. Production of Nickel-Hydrogen Storage Battery (1) Example 1 Next, a cut-and-raised piece was formed from one circular metal plate (for example, made of nickel and having a thickness of 0.3 mm). A current collecting lead 20 for electrically connecting the sealing body 17 is prepared. The current collecting lead 20 is formed by bending a main body 21 made of one circular metal plate into two cut-and-raised pieces 22a provided opposite to each other by bending.
22b is formed, and a flat welding surface 23 is formed on the top surface thereof. On the welding surface, a projection 24 serving as a welding point provided with flexibility by slits 26a to 26d is symmetrical on the welding surface. It is formed as follows. Due to the formation of this slit, when welding the lower surface of the sealing body and the plurality of projections arranged on the upper surface of the current collecting lead, even when each welding surface is inclined, the plurality of projections and the lower surface of the sealing body This makes it possible to achieve the effect that the contact of the metal is made uniform and the variation in pressure applied during welding is reduced. Thereby, variations in welding are suppressed, and detachment, variation in charging / discharging current due to insufficient welding, corrosion and cracks due to welding burn, and the like can be suppressed. By forming the slits in this manner, the flexibility and elasticity of the current collecting lead can be enhanced, even a slight displacement can be absorbed, and the current collecting lead can be easily welded to the sealing member or the current collector. It will be sure. In addition, the work of caulking the sealing body to the opening of the outer container is also easy, and in the press-fitting step, bending deformation occurs at the bending guide part by pressure so that a good connection state can be maintained near the welding point. In addition, the current collecting lead is maintained in a state where the welding surface is parallel to the current collector while maintaining the symmetric state in cross section, so that the welded portion can be favorably held. Therefore, the production of the storage battery becomes easy. In addition, it has a bent portion 25 in the shape of a "ku" or an inverted "ku" bent inward, and a uniform stress is applied to the inside from the bent portion in the shape of a "ku", Deformable. In addition, a welding point 2 is formed on the rear surface side of the main body, and the projection is formed on the rear surface.
4s, which are arranged to form concentric circles.

When assembling a nickel-hydrogen storage battery using the current collecting lead 20, first, the above-mentioned electrode body 10 is formed in a bottomed cylindrical outer container made of nickel-plated iron (the outer surface of the bottom is a negative electrode. A space 10 a formed in the center of the electrode body 10
, A negative electrode current collector 15 welded to the hydrogen storage alloy negative electrode plate 12 was spot-welded to the inner bottom surface of the outer container 16. Thereafter, the above-described current collecting lead 2
The current collector main body 21 and the positive electrode are removed from the blank while the main body 21 of the negative electrode is positioned on the current collector main body 21 of the current collecting lead 20 as the positive electrode current collector. Spot welding (first welding) at the position of the welding point 24s.

After the main body 21 of the current collector lead 20 and the current collector main body 21 are welded in this manner, as shown in FIG. The outer container 16 was inserted, and a groove was formed on the outer peripheral side of the outer container 16 to form an annular groove 16 a at the upper end of the vibration-proof ring 18. Next, 30% by mass of potassium hydroxide (K
After injecting an electrolytic solution composed of an OH) aqueous solution, a sealing body 17 having an insulating gasket 19 fitted around the periphery thereof was disposed above the opening of the outer container 16. In this case, the sealing body 1
7 was arranged so that the bottom surface of the 7 was in contact with the welding surfaces 23a and 23b of the current collecting lead 20. The sealing body 17 includes a lid 17a having a circular downward projection formed on the bottom surface, a positive electrode cap (positive electrode external terminal) 17b, and a spring 17 interposed between the lid 17a and the positive electrode cap 17b.
c and a valve plate 17d, and a lid 17a
Is formed with a gas vent hole at the center.

After the sealing member is disposed as described above, one welding electrode W1 is disposed on the upper surface of the positive electrode cap (positive external terminal) 17b, and the other welding electrode is disposed on the lower surface of the bottom surface of the outer container 16 (negative external terminal). The welding electrode W2 was arranged. Thereafter, 2 × 10 ^{6 is applied} between the pair of welding electrodes W1 and W2.
While applying a pressure of N / m ² , these welding electrodes W1,
Apply a voltage of 24 V in the discharge direction of the battery between W2 and 3K
An energization process was performed in which the current of A was passed for about 15 msec. By this energization process, the contact portion between the bottom surface of the sealing body 17 and the projection 24 of the welding surface 23 of the current collecting lead 20 is welded (second welding), and a weld is formed.

2 × 10 ⁶ between a pair of welding electrodes W1 and W2
While applying a pressure of N / m ² , these welding electrodes W
By applying a voltage between the electrodes 1 and W2 and performing an energization process, even if the height of the electrode body 10 varies or the welding position of the main body 21 of the current collecting lead varies. Since the flexibility is given by the presence of the slit and the cut-out portion, the welding surface 23 of the current collecting lead 20 is formed.
The contact point 24 can be formed between the sealing member 17 and the bottom surface of the sealing body 17. This makes it possible to suppress the occurrence of “welding dust”, which is one of the causes of the occurrence of an internal short circuit, and to form a welded portion having no internal defects and excellent in welding strength.

Next, the battery was sealed by caulking the opening edge 16b of the outer container 16 inward to obtain a semi-finished battery as shown in FIG. Thereafter, as shown in FIG. 5, the semi-finished battery was placed in a pair of split dies A1 and A2, and a punch P connected to a press was placed above the sealing body 17. Next, the punch P is moved down by driving the press machine, and the sealing portion (the outer container 1) of the sealing body 17 is closed.
6 was pressed by the punch P to push the sealing body 17 into the outer container 16.

As a result, the annular groove 16 a is crushed, and the lower end of the insulating gasket 19 descends to near the upper end of the vibration isolating ring 18. Thus, a cylindrical nickel-hydrogen storage battery having a nominal capacity of 6.5 Ah was manufactured as shown in FIG. Note that, due to the pressing force of the punch P, the cut-and-raised portion 22a, which is a leg of the current collecting lead 20,
22b is crushed along a pair of ku-shaped or inverted ku-shaped bent portions 25 formed in the axial direction of both end edges, and its cross-sectional shape is uniformly deformed so as to form a symmetrical shape. Example 1 manufactured in this manner.
Was designated as Battery A.

In order to form the above-described welded portion, the positive electrode cap (positive electrode external terminal) 17a and the outer container 1
6, a current density at the time of energizing a contact portion between the bottom surface of the sealing body 17 and the peripheral side surface of the main body portion 21 of the tubular body 20 is increased, thereby generating Joule heat at the contact portion. It is necessary to increase the size to make it easily glow red. Then, the following various embodiments can be considered.

(2) Embodiment 2 FIG. 7 is a perspective view showing a state where the current collecting lead of Example 2 is welded to an electrode body, and FIG. 8 is a plan view and a sectional view of this current collecting lead. The electrode body 10 used in the second embodiment is the same as that in the first embodiment. In the second embodiment, instead of the cut-and-raised portions 31a and 31b, the entire central portion of the main body 31 is projected in a hat shape. A welding surface 33 having a circular top surface is formed, a thin region 35S is formed near the welding surface 33, and the thin region is formed so as to be easily deformed. In addition, by performing a process of projecting in a hat shape, the projecting portion becomes thin, and the entire projecting portion is easily deformed.

The main body 31 of the current collecting lead 30
Is placed so as to be in contact with the terminal connected to the positive electrode, and the main body 31 is mounted on the positive electrode current collector 14, and the main body 31 and the positive electrode current collector 14 are spot-welded (first welding). After that, the bottom surface of the sealing body 17 and the welding surface 33 of the current collecting lead are welded (second welding) in the same manner as in Example 1 described above, and pressurized by the sealing and the punch P to form a cylindrical nickel having a nominal capacity of 6.5 Ah. -A hydrogen storage battery was prepared. The pressing force of the punch P causes the cross-sectional shape to be crushed about the thin region 35. The nickel-hydrogen storage battery of Example 2 thus manufactured was referred to as Battery B.

(3) Embodiment 3 FIG. 9 is a perspective view showing a state in which a tubular body constituting a lead current collecting lead of Embodiment 3 is welded to an electrode body. The electrode body 10 used in the third embodiment is the same as that in the first embodiment, and the third embodiment is characterized in that a cylindrical body 40 whose both ends are cut obliquely is used as a current collecting lead. .

The cylindrical body 40 is composed of a cylindrical main body 41 whose both ends are cut obliquely, and a pair of diagonally cut both ends 42a and 42b of the main body 41 extend in the axial direction. The notch 45 is provided. The cylindrical body 40 is formed by using a cylindrical pipe (for example, one made of nickel and having a thickness of 0.3 mm) with its both ends cut off obliquely. The height of the tubular body 40 is the length of the diameter of the main body 41, and the current collecting distance from the welded portion on the bottom surface of the sealing body 17 to the welded portion on the upper surface of the positive electrode current collector 14 is the same as that of the tubular body 40. It is the length of the semicircle (for example, 7.85 mm).

The bottom body 41 of the tubular body 40
Is placed so as to be positioned on the diameter of the positive electrode current collector 14, and an electrode rod for welding is vertically set on the inner peripheral surface exposed from both end edges 42 a and 42 b of the cylindrical body 40. 41 is spot-welded (first welded) to the positive electrode current collector 14, and the bottom surface of the sealing body 17 and the cylindrical body 40 are formed in the same manner as in the first embodiment.
Was welded (second welding) to the peripheral side surface of the main body portion 41, and pressurized with a seal P and a punch P to produce a cylindrical nickel-hydrogen storage battery having a nominal capacity of 6.5 Ah. Due to the pressing force of the punch P, the main body 41 is crushed into a substantially elliptical cross-sectional shape. The nickel-hydrogen storage battery of Example 3 thus manufactured was referred to as Battery C.

(4) Fourth Embodiment FIG. 10 is a perspective view showing a state where the current collecting lead 50 of the fourth embodiment is welded to an electrode body, and FIGS. 11 (a) and (b) are a plan view and a plan view of the current collecting lead. It is sectional drawing. Example 4
The electrode body 10 used in the second embodiment is the same as that in the first embodiment.
And two leg portions 52a and 52b having the same length extending from the welding surface 53. The bending guide portion is constituted by a fine hole 55 formed in a linear shape.
It is characterized in that it is formed in the middle part of the parts a and 52b. The main body connected to the positive electrode current collector is the leg 5.
2a and 52b are connected to each other, a hollow is formed on the back surface side, and constitutes a projection 54s serving as a welding point.

The main body 51 of the current collecting lead 50
Is placed so as to be positioned on the diameter of the positive electrode current collector 14, and the projections 54s of the main body portions 51a and 51b are spot-welded to the positive electrode current collector 14 (first welding). Similarly, the bottom surface of the sealing body 17 and the projection 54 of the welding surface 53 were welded (second welding) and pressurized by the sealing and the punch P to produce a cylindrical nickel-hydrogen storage battery having a nominal capacity of 6.5 Ah. Due to the pressure applied by the punch P, the leg portion of the current collecting lead is uniformly crushed so that its cross-sectional shape is bent along the fine hole 55. The nickel-hydrogen storage battery of Example 4 thus manufactured was referred to as Battery D. In the above-described embodiment, the fine holes 55 are formed with a profile such that the inside has a larger diameter than the outside, and thus have a shape that easily deforms inward. The bent portion may be a V-notch formed from the outside or a slit. Furthermore, the legs 52a, 52b are disposed perpendicularly to the main bodies 51a, 51b and the current collector 14 in contact with the main bodies 51a, 51b, but open as approaching the current collector 14, as shown by the broken line. The current collecting lead may be formed in such a manner as to form a trapezoidal shape having a leg-shaped cross section. The use of a trapezoidal cross section also has an advantage that a crimped shape is easily formed well.

(5) Fifth Embodiment FIG. 12 is a perspective view showing a state where the current collecting lead 60 of the fifth embodiment is welded to an electrode body, and FIGS. 13 (a) and (b) are plan views of this current collecting lead. It is sectional drawing. Example 5
The electrode body 10 used in the second embodiment is the same as that in the first embodiment. In the fifth embodiment, the welding surface is not formed by a flat surface, but a large large slit 67 is formed.
The welding point 64 is surrounded by a large slit 67 and individual small slits 68 so as to protrude and protrude, so that flexibility (elasticity) is imparted, and further, a leg 62 a connected to the welding surface 63. , 62b are also provided with slits 65 so that flexibility (elasticity) is imparted, and bending is locally facilitated by a pressing force. The main body connected to the positive electrode current collector is connected to the legs 52a and 52b, and a hollow is formed on the back side to form a projection 54s serving as a welding point.

The main body 61 of the current collecting lead 60
a and b are placed so as to be positioned on the diameter of the positive electrode current collector 14, and spot-welded (first welding) to the positive electrode current collector 14 via the projection 64 s, similarly to the first embodiment described above. The bottom surface of the sealing body 17 and the four welding points 64 protruding from the welding surface 63 of the current collecting lead 60 are welded (second welding), pressurized by the sealing and punch P, and pressurized by a cylindrical nickel having a nominal capacity of 6.5 Ah. -A hydrogen storage battery was prepared. Due to the pressing force of the punch P, the legs are uniformly crushed so that their cross-sectional shapes are symmetric. The nickel-hydrogen storage battery of Example 5 thus produced was referred to as Battery E. In the above-described embodiment, the legs 62a and 62b are disposed perpendicular to the main bodies 61a and 61b and the current collector 14 abutting on the main bodies 61a and 61b. The current collecting lead may be formed so as to have a trapezoidal shape with an equal cross section. The use of a trapezoidal cross section also has an advantage that a crimped shape is easily formed well.

(6) Embodiment 6 FIG. 14 is a perspective view showing a state where the current collecting lead 70 of Example 6 is welded to an electrode body, and FIGS. 15 (a) and (b) are plan views and It is sectional drawing. Example 6
The electrode body 10 used in the first embodiment is the same as in the first embodiment.
6b and 77a, 77b, which are provided with flexibility to be cut and raised to form a projecting surface. On the surface of the welding surface 73, four welding points 74 are projected at symmetrical positions. Further, slits 76a, 76b and 77a, 77 connected to the welding surface 73 are provided.
and leg portions 72a of equal legs formed separately from each other
７２72d, and it is configured such that bending is locally facilitated by a pressing force at a position 79 corresponding to the slit end.

The main body 71 connected to the positive electrode current collector
The projections 7a and 71b are connected to the legs 72a to 72d.
4s.

The main body 71 of the current collecting lead 70
a and b are placed so as to be positioned on the diameter of the positive electrode current collector 14, and spot-welded (first welding) to the positive electrode current collector 14 via the protrusion 74 s, similarly to the first embodiment described above. The bottom surface of the sealing body 17 and the four welding points 74 protruding from the welding surface 73 of the current collecting lead 70 are welded (second welding) and pressurized by the sealing and the punch P to form a cylindrical nickel having a nominal capacity of 6.5 Ah. -A hydrogen storage battery was prepared. Due to the pressing force of the punch P, the legs are uniformly crushed so that their cross-sectional shapes are symmetric. The nickel-hydrogen storage battery of Example 5 thus manufactured was referred to as Battery F.

(7) Comparative Example As a comparative example, as shown in FIGS.
Using a plate-shaped current collecting lead 200, a battery X was formed in exactly the same manner as in the above example.

3. Battery Characteristics Test (1) Activation After charging for 8 hours at room temperature (about 25 ° C.) at a current value of 650 mA (0.1 C) using batteries A to F of the respective examples prepared as described above. Pause for 1 hour, then 1
Battery voltage is 0.8 V at a current value of 300 mA (0.2 C)
, And the battery was activated by repeating the charge / discharge cycle 10 times.

(2) VI Characteristics Test Next, the batteries A to F of the respective examples activated as described above were activated.
Using battery X, at room temperature (about 25 ° C.), 1300 mA
The battery in a state of being discharged until the battery voltage reached 0.8 V at the current value of (2C) was charged at a current value of 1300 mA (0.2 C) for 3 hours. Then, after resting for 1 hour, 25
The battery was discharged at the current value of A for 30 seconds, and the battery voltage after 10 seconds was measured. Next, after charging the electric power corresponding to the discharged capacity, similarly, at a current value of 50 A, 70 A, and 100 A, 30
The battery was discharged for 10 seconds, and the battery voltage after 10 seconds was measured. The thus obtained battery voltage after 10 seconds is set on the vertical axis, and each current value is set on the horizontal axis, with a VI straight line (VI characteristic).
Was obtained, the result as shown in FIG. 24 was obtained.

As is clear from FIG. 24, the slopes of the VI straight lines of the batteries A to F of the respective examples are small. This indicates that the operating voltages of the batteries A to F in each example are all high and the internal resistance of the batteries is low. This is because the batteries A to F of the respective embodiments have current collecting leads 0, 30, 40, and 5
It is considered that welding of 0, 60, and 70 was performed well, the internal resistance was reduced, and high output characteristics were obtained.

Next, a modification of the current collecting lead of the present invention will be described.

Modification Example 1 As shown in FIGS. 16A and 16B, the current collecting lead 80 has a peripheral portion constituting a main body portion 81 and connected to an electrode. It functions as both a power supply lead and a current collecting lead. That is, this current collecting lead 80
A flat surface 83 having cut-and-raised portions (leg portions) 82a and 82b serving as legs formed opposite to each other at a central portion and having a region where a top surface of the cut-and-raised portion can be a welding point is formed. A bent guide portion 85 formed of a constricted deformation portion is formed at the cut-and-raised portions 82a and 82b. By performing squeezing processing and causing squeezing deformation,
The periphery of the constricted portion becomes thin, and deformation is likely to occur from this portion. 86 is a slit. This collecting lead 8
Numeral 0 is formed by integrally forming a current collector body 21 connected to the positive electrode and a lead (current collecting lead).

Modification 2 As shown in FIGS. 17 (a) and 17 (b), this current collecting lead 90 also has a peripheral portion constituting a main body 91 and connection to electrodes, similarly to the aforementioned modification 1. And serves as both a current collector and a current collecting lead. That is, the current collecting lead 90 has cut-and-raised portions (leg portions) 92a and 92b, which are leg portions obliquely formed opposite to the center portion.
A flat surface 93 having a region where the top surface of the cut-and-raised portion can be a welding point;
a, a bending guide portion 9 formed so that the strength is weakened by forming a slit at the boundary between the body portion 91 and the main body portion 91.
5 is characterized. The bending guide portion 95 is a region that is easily deformed, and is easily deformed from this portion when pressurized. 96 is a slit. According to such a configuration, the cut-and-raised portions 92a and 92b are formed so as to open diagonally, so that the bending guide portion is easily deformed.

Modification 3 As shown in FIGS. 18 (a) and 18 (b), this current collecting lead 100 is also formed in substantially the same manner as in Modification 2, and the cut-and-raised portion is almost square at the center. It has a flat welding surface 103 and a welding point 104 is formed at the corner of this square. The peripheral part is the main body 1
No. 01 is connected to the electrodes, and serves as both a current collector and a current collecting lead. In other words, this current collecting lead 100 has cut-and-raised portions (leg portions) 102a, 1
02b, and a flat surface 103 having a region where the top surface of the cut-and-raised portion can serve as a welding point, and formed with a slit 105s at the boundary between the cut-and-raised portions 102a and 102b and the main body 101 to provide strength. Is characterized by having a bending guide portion 105 formed so as to be weaker. The bending guide portion 105 is a region that is easily deformed, and is easily deformed from this portion when pressed.

Modification 4 As shown in FIGS. 19A and 19B, the current collecting lead 110 is also formed in substantially the same manner as in Modification 3, and the cut-and-raised portion is almost square at the center. It has a flat welding surface 113 and is characterized in that two welding points 114 are arranged in parallel at the center of this square. Other than the bending deformation portion, it is almost the same as the third modification.

Modification 5 As shown in FIGS. 20A and 20B, this current collecting lead 120 is also formed substantially in the same manner as in Modification 4, and the cut-and-raised portion is almost square at the center. It has a flat welding surface 123 and is characterized in that four welding points 124 are arranged in parallel at the center of this square. The bending guide portion 125 is provided in the same manner as the first modification.
22a and 122b have a constricted deformation portion, and are formed so that constriction deformation is easily caused by a slit 126.

Modification 6 As shown in FIGS. 21 (a) and 21 (b), this current collecting lead 130 is also formed substantially in the same manner as in Modification 5, and the cut-and-raised portion is almost square at the center. It has a flat welding surface 133, four welding points 134 are arranged in parallel at the center of the square, and the bending guide is
Similarly to the above, a character-shaped constricted portion is formed.

Modification 7 As shown in FIGS. 22 (a) to 22 (c), a plan view, a side view, and a cross-sectional view when a sealing body is mounted, the current collecting lead 140 is also formed of a disc-shaped plate. A main body 141 also serving as a current collector, and cut-and-raised pieces 142a and 14
2b is formed, and the folded end portion 143 becomes a flat surface.
a, 143b, and the turned-back end constitutes a welding surface. Here, 147 indicates a sealing body.

By using the current collecting lead having such a shape, the sealing member is easily and uniformly deformed by receiving pressure at the time of crimping, and as shown in a sectional view after crimping in FIG. Since the distance from the body part 141 (electrode) is reduced,
Low resistance can be achieved.

In the above-described embodiment and modified examples, an example was described in which the sealing member was a positive electrode terminal and the outer container was a negative electrode terminal. However, the sealing member was a negative electrode terminal.
The outer container may be used as the positive electrode terminal. In this case, the positive electrode current collector is welded to the inner bottom surface of the battery outer container, and the bottom surface of the sealing body is welded to the negative electrode current collector via the current collecting leads 20, 30, 40, 50, and 60.

Further, in the above embodiment, the electrolyte was injected after the electrode body was mounted on the outer container and the current collecting lead was welded. However, in the case of a storage battery using a solid electrolyte, between the positive electrode and the negative electrode, A procedure of mounting the battery with the electrolyte sandwiched therein, welding the current collecting lead, sealing and crimping is performed.

Also, the welding process is not limited to the above-described embodiment, and is also applicable to a case where a direct welding method in which a current is flowed through an electrolyte and then welding is performed after a current collecting lead is attached and sealed. It goes without saying that it is possible. In particular, when this direct welding method is used, since the current collecting lead has a stable shape with a flat surface (welding surface) on the upper surface and a symmetrical cross section, the current collecting lead can be stably placed, and a displacement occurs at the time of sealing. There is also an effect that can be prevented.

Further, in the above-described embodiments and modified examples, an example in which the present invention is applied to a nickel-metal hydride storage battery has been described. However, the present invention is not limited to a nickel-metal hydride storage battery, but may be applied to a nickel-cadmium storage battery or the like. Obviously, it can be applied to other storage batteries.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a current collecting lead according to a first embodiment of the present invention is welded to an electrode body.

FIG. 2 is a plan view and a sectional view of a current collecting lead according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state where an electrode body is inserted into an outer container and the current collecting lead of FIG. 1 is welded to a sealing body.

FIG. 4 is a cross-sectional view showing a state in which a sealing body is sealed in an opening of the outer container.

FIG. 5 is a cross-sectional view showing a state where a sealing portion is pressed.

FIG. 6 is a cross-sectional view showing a completed nickel-hydrogen storage battery in which an electrode body inserted into an outer container is welded to a sealing body via a current collecting lead.

FIG. 7 is a perspective view showing a state where a current collecting lead according to a second embodiment of the present invention is welded to an electrode body.

FIG. 8 is a plan view and a sectional view of a current collecting lead according to a second embodiment of the present invention.

FIG. 9 is a perspective view showing a state where a current collecting lead according to a third embodiment of the present invention is welded to an electrode body.

FIG. 10 is a perspective view showing a state where a current collecting lead according to a fourth embodiment of the present invention is welded to an electrode body.

FIG. 11 is a plan view and a sectional view of a current collecting lead according to a fourth embodiment of the present invention.

FIG. 12 is a perspective view showing a state where a current collecting lead according to a fifth embodiment of the present invention is welded to an electrode body.

FIG. 13 is a plan view and a sectional view of a current collecting lead according to a fifth embodiment of the present invention.

FIG. 14 is a perspective view showing a state where a current collecting lead according to a sixth embodiment of the present invention is welded to an electrode body.

FIG. 15 is a plan view and a cross-sectional view of a current collecting lead according to a sixth embodiment of the present invention.

FIG. 16 is a plan view and a cross-sectional view of a current collecting lead according to a first modification of the present invention.

FIG. 17 is a plan view and a cross-sectional view of a current collecting lead according to a second modification of the present invention.

FIG. 18 is a plan view and a cross-sectional view of a current collecting lead according to a third modification of the present invention.

FIG. 19 is a plan view and a cross-sectional view of a current collecting lead of Modification 4 of the present invention.

FIG. 20 is a plan view and a cross-sectional view of a current collecting lead of Modification Example 5 of the present invention.

FIG. 21 is a plan view and a cross-sectional view of a current collecting lead according to Modification 6 of the present invention.

FIG. 22 is a plan view and a cross-sectional view of a current collecting lead according to Modification 7 of the present invention, and a diagram showing a state after crimping.

FIG. 23 is an explanatory diagram of a main part of a conventional storage battery.

FIG. 24 is a view showing IV characteristics of the battery of the embodiment of the present invention and the battery of the comparative example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Electrode body, 11 ... Positive electrode plate, 12 ... Negative electrode plate, 13 ... Separator, 14 ... Positive electrode collector, 15 ... Negative electrode collector, 16
... outer container (negative electrode external terminal), 16a ... groove, 17 ... sealing body, 17a ... lid, 17b ... positive electrode cap (positive electrode external terminal), 18 ... vibration isolation ring, 19 ... insulating gasket, 2
0, 30, 40, 50, 60, 70 ... current collector, W1, W
2: welding electrode, A1, A2: split type, P: punch

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 5H011 AA03 AA04 AA09 CC06 DD13 DD15 DD26 EE04 FF03 GG02 HH02 5H022 AA04 AA18 BB02 BB03 BB16 BB19 BB28 CC12 CC13 EE03 5H028 AA07 BB01 BB04 CC05 CC05 CC07

Claims (34)

[Claims] 1. A current collecting lead interposed between a terminal and an electrode for connecting the terminal and the electrode, the current collecting lead having a bending guide portion for promoting local bending deformation when pressurized. Electric lead. 2. A current collecting lead which is interposed between the terminal and the electrode to connect the terminal and the electrode, and which is formed by caulking after welding with the terminal or the electrode, wherein a pressure is applied by the caulking. A current collecting lead having a bending guide portion that sometimes promotes local bending deformation. 3. A current collecting lead which is interposed between the terminal and the electrode to connect the terminal and the electrode, and is caulked after welding with the terminal or the electrode, wherein the current collecting lead is A current collecting lead comprising a cylindrical body having a flat surface on a side peripheral surface, wherein a plurality of welding points are provided on the flat surface. 4. The cylindrical body has two flat surfaces facing each other on a side peripheral surface, and a surface of the two flat surfaces connected to the electrode has a surface area greater than that of the terminal connected to the terminal. The current collecting lead according to claim 3, which is large. 5. The current collecting lead according to claim 1, wherein the current collecting lead has a symmetrical cross section parallel to a pressing surface. 6. The current collecting lead according to claim 1, wherein the bending guide is a slit. 7. The bending guide portion is formed at a position symmetrical with respect to the welding point, and is a region (elastic portion) having higher flexibility than other regions. 6. The current collecting lead according to any one of claims 1 to 5. 8. The current collecting lead according to claim 7, wherein the bending guide is a region provided with flexibility by a slit formed in a peripheral portion. 9. The current collecting lead according to claim 1, wherein the bending guide portion is a thin portion formed at a position symmetrical with respect to the welding point. 10. The current collecting lead includes a welding surface having a region that can be a welding point on a surface thereof, and at least two equal legs extending from the welding surface. The current collecting lead according to any one of claims 1, 2, 5 to 9, wherein the current collecting lead is formed at an intermediate portion of the portion. 11. The current collecting lead comprises: a welding surface having a region that can be a welding point on a surface; and at least two legs of equal legs extending from the welding surface. The current collecting lead according to any one of claims 1, 2, 5 to 9, wherein the current collecting lead is a bent portion formed in a middle portion of the leg and bent inward. 12. The current collecting lead is made of a circular metal plate, has a cut-and-raised portion protruding at a central portion, and forms a flat surface having a region where a top surface of the cut-and-raised portion can be a welding point. 10. The current collecting lead according to claim 1, wherein a bent guide portion is formed in the cut-and-raised portion. 13. The current collecting lead is formed by subjecting a circular metal plate to irregular processing, and has a peripheral portion formed of a first flat surface and a top surface projected from the first flat surface. 2. The semiconductor device according to claim 1, further comprising a convex region that forms a second flat surface having a region that can be a welding point.
10. The current collecting lead according to any one of 2, 5 to 9. 14. The first flat surface is provided with a projection protruding to the rear surface side, and is configured to be able to form a welding point with an electrode. The second flat surface is a projection protruding to the top surface side. 14. The current collecting lead according to claim 13, wherein the current collecting lead is provided so as to be able to form a welding point with the terminal. 15. The welding point according to claim 13, wherein a region surrounded by two parallel slits formed on the second flat surface is formed so as to protrude by bending. Or the current collecting lead according to 14. 16. An external container, comprising: an outer container; positive and negative electrodes disposed in the outer container; and an electrolyte disposed between the outer container and the positive or negative electrode. A storage battery that is electrically connected to one of the terminals to form a terminal of one pole, and the other is connected to a terminal of the other pole that is electrically insulated from the outer container; At least one of the terminals and the terminal are connected via a current collecting lead having a bending guide portion that facilitates local bending deformation when pressurized, and the terminal is bent by the bending guide portion. Characteristic storage battery. 17. An outer container having an opening serving also as a terminal of one electrode, a positive electrode and a negative electrode disposed in the outer container, an electrolyte disposed therebetween, and the opening. A storage battery provided with a sealing body also serving as a terminal of the other electrode for sealing the terminal, wherein at least one of the positive electrode or the negative electrode and the terminal are connected to each other, and a bending guide for facilitating local bending deformation when pressurized. A storage battery connected via a current collecting lead having a portion and bent by the bending guide portion. 18. The current collecting lead is connected via a current collector connected to one of the positive electrode and the negative electrode, and the sealing member and the current collector are formed from a cylindrical body having a hollow portion. The storage battery according to claim 16, wherein the storage battery is welded to a current collecting lead. 19. The cylindrical body opposing a side peripheral surface of the cylindrical body.
19. The storage battery according to claim 18, comprising two flat surfaces, of the two flat surfaces, a surface connected to the electrode has a larger surface area than a surface connected to the terminal. 20. The storage battery according to claim 18, wherein the cylindrical body is crushed by a pressing force and has a cross-sectional shape that is symmetric with respect to a plane including an axis of the cylindrical body. 21. The storage battery according to claim 17, wherein the current collecting lead has a symmetrical cross section parallel to a pressing surface. 22. The storage battery according to claim 16, wherein the bending guide is a slit. 23. The bending guide portion is formed at a position symmetrical with respect to the welding point, and is a region (elastic portion) having higher flexibility than other regions. 20. The storage battery according to any one of 20. 24. The storage battery according to claim 23, wherein the bending guide is a region provided with flexibility by a slit formed in a peripheral portion. 25. The storage battery according to claim 16, wherein the bending guide portion is a thin portion formed at a position symmetrical with respect to the welding point. 26. The current collecting lead includes a welding surface having a region that can be a welding point on the surface, and at least two equal legs extending from the welding surface, and is formed at an intermediate portion of the equal legs. 26. The storage battery according to any one of claims 16, 17, 21 to 25, wherein the storage battery is pressed and bent by the bent guide portion so as to form an equal leg shape. 27. The current collecting lead comprises a welding surface having a region that can be a welding point on the surface, and at least two legs of equal legs extending from the welding surface. , Which are bent inwardly in the shape of a "ku".
26. The storage battery according to any one of 21 to 25. 28. The current collecting lead is made of a circular metal plate, and has a plurality of cut-and-raised pieces formed at the center thereof so as to face each other, and a region where a top surface of the cut-and-raised piece can be a welding point. The storage battery according to any one of claims 16, 17, 21 to 25, wherein the storage battery has a flat surface having the following shape, and is pressed and bent by a bending guide portion formed on the cut-and-raised piece. 29. The current collecting lead is formed by processing a circular metal plate into and out, and has a peripheral portion formed of a first flat surface and a top surface protruding from the first flat surface. 17. A feature having a convex region forming a second flat surface having a region that can be a welding point.
26. The storage battery according to any one of 1 to 25. 30. The first flat surface is provided with a projection protruding to the rear surface side, and is configured to be able to form a welding point with an electrode. The second flat surface is a projection protruding to the top surface side. 30. The storage battery according to claim 29, further comprising: a welding point with the terminal. 31. The welding point, wherein a region surrounded by two parallel slits formed on the second flat surface is formed to be projected by bending. Or the storage battery according to any of 30. 32. A step of arranging a positive electrode and a negative electrode in an outer container provided with an opening serving also as a terminal of one electrode; and facilitating local bending deformation when one of the electrodes is pressurized. A welding step of welding one end of a current collecting lead having a bending guide portion and welding the other end of the current collecting lead to a sealing member also serving as a terminal of the other electrode; and the sealing member at the opening of the outer container. A crimping step of crimping the outer container, sealing the outer container, and crimping the current collecting lead so as to bend at the bending guide portion. 33. A step of arranging oppositely formed positive and negative electrodes in an outer container provided with an opening serving also as a terminal of one pole, and easily performing local bending deformation during pressurization. Arranging the sealing body at the opening of the outer container so that one of the electrodes and the sealing body also serving as a terminal of the other electrode are in contact with each other via a current collecting lead having a bending guide portion to be formed. A welding step of flowing a current between the outer container and the sealing member to weld the current collecting lead to at least one of the sealing member or the electrode; and sealing the sealing member to the opening of the outer container. A step of disposing, crimping and sealing the outer container, and crimping the current collecting lead so as to bend at the bending guide portion. 34. An electrode body having a current collector connected to at least one end of a positive electrode and a negative electrode arranged opposite to each other in an outer container having an opening serving also as a terminal of one electrode. Arranging, a first welding step of welding a current collecting lead having a bending guide portion for facilitating local bending deformation on the upper surface of the current collector, and a first welding step of attaching the current collecting lead to the opening. Arranging the sealing body at the opening of the exterior container so that the sealing body comes into contact with the sealing body, and passing a current between the exterior container and the sealing body to cause the current collecting lead to flow. A second welding step of welding to the sealing body, arranging the sealing body at the opening of the outer container, caulking the outer container and sealing, and so that the current collecting lead is bent by the bending guide portion. And a crimping step for crimping. Method for producing a battery.