JP2003197174A - Battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery capable of surely welding aluminum foils or copper foils to connecting parts 5d, 5e, 6d, 6e by interposing the connecting parts 5d, 5e, 6d, 6e of current collecting connecting plates 5, 6 and a plurality of aluminum foils or copper foils of electrodes 1a, 1b between interposing plates 7, 8, 9, 10, and welding them. <P>SOLUTION: The connecting parts 5d, 5e, 6d, 6e of the metal current collecting connecting plates 5, 6 connected and fixed to a positive terminal 3 or a negative terminal 4 and a plurality of aluminum foils or copper foils of the electrodes 1a, 1b projecting from the end surface of a power generating element 1 are piled up and interposed between facing parts of the interposing plates 7, 8, 9, 10 comprising a metal plate thinner than the current collecting connecting plates 5, 6, and welded by ultrasonic welding. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery in which a plurality of collector metal foils of electrodes protruding from an end face of a power generating element are connected to terminals via a collector connection plate.

[0002]

2. Description of the Related Art A configuration example of a conventional large non-aqueous electrolyte secondary battery used in an electric vehicle or the like will be described. As shown in FIG. 4, this non-aqueous electrolyte secondary battery has a long cylindrical winding power generation element 1 housed in a long cylindrical container-shaped battery container (not shown). In order to connect the positive electrode terminal 3 and the negative electrode terminal 4 attached to the cover plate 2 that closes the part to the positive electrode 1a and the negative electrode 1b of the power generation element 1, the current collector connection plates 5 and 6 made of metal plates are used. The power generation element 1 is formed by winding a strip-shaped positive electrode 1a and a negative electrode 1b vertically with a separator 1c in between and winding them into a long cylindrical shape, whereby the active material of the positive electrode 1a is not coated on the lower end surface of the long cylindrical shape. The aluminum foil, which is the portion of the negative electrode 1b, is projected, and the copper foil, which is the active material uncoated portion of the negative electrode 1b, is projected on the upper end surface. In addition, in order to make the explanation easy to understand in the drawings, the electrodes 1a,
Although the number of windings of 1b is shown to be small, in reality, a large number of windings are performed extremely densely.

The collector connection plate 5 on the positive electrode side is made of an aluminum plate and is arranged on the lower end surface of the power generating element 1, and the side end portion is pulled out to the upper end portion along the outer peripheral side surface of the power generating element 1. . Further, the negative electrode side current collecting and connecting plate 6 is made of a copper plate and is arranged on the upper end surface of the power generating element 1. These current collecting and connecting plates 5 and 6 are formed by bending an aluminum plate or a copper plate into a corrugated plate shape so that two U-shaped portions 5a and 6a are formed.
Are formed. Then, U of the collector connection plate 5 on the positive electrode side
In the character portion 5a, the positive electrode 1a protruding to the lower end surface of the power generation element 1 is provided.
A plurality of aluminum foils of No. 1 are sandwiched, and a plurality of copper foils of the negative electrode 1b protruding on the upper end surface of the power generation element 1 are sandwiched in the U-shaped portion 6a of the collector connection plate 6 on the negative electrode side. It is connected and fixed by sonic welding.

The collector connection plate 5 on the positive electrode side is the power generation element 1
The upper end of the positive electrode terminal 3 attached to the cover plate 2 is connected and fixed to the lower end of the positive electrode terminal 3 attached to the lid plate 2 by welding or caulking. Further, the collector connection plate 6 on the negative electrode side
Is the side edge of the aluminum plate on which the U-shaped portion 6a is formed,
It is pulled out a little upward, and is connected and fixed to the lower end of the negative electrode terminal 4 attached to the cover plate 2 by welding or caulking. As a result, the positive electrode 1a and the negative electrode 1b of the power generation element 1 are connected to the positive electrode terminal 3 and the negative electrode terminal 4 of the non-aqueous electrolyte secondary battery, respectively.

[0005]

However, when a plurality of aluminum foils of the positive electrode 1a and copper foils of the negative electrode 1b are sandwiched between the U-shaped portions 5a and 6a of the collector connection plates 5 and 6 to perform ultrasonic welding, The pair of welding horns are pressed against the both side walls of the U-shaped portions 5a and 6a from the outside to apply ultrasonic vibration.
Since the side walls of the U-shaped portions 5a and 6a have a thickness of about 0.5 to 1.0 mm, which is the same as the thickness of the collector connection plates 5 and 6, this ultrasonic vibration is sufficiently transmitted to the aluminum foil or the copper foil. However, there was a problem that welding was incomplete.

Although the problem of incomplete welding with aluminum foil or copper foil can be solved by reducing the thickness of the current collecting and connecting plates 5 and 6, these current collecting and connecting plates 5 and 6 are solved. Since the electric resistance of the non-aqueous electrolyte secondary battery increases as the thickness decreases, a new problem arises that the internal resistance of the non-aqueous electrolyte secondary battery increases and it becomes impossible to extract a large current. In addition, a method has also been proposed in which a window portion that communicates with the inside is formed in the U-shaped portions 5a and 6a of the collector connection plates 5 and 6, and laser welding is performed on an aluminum foil or a copper foil through the window portion. If the light is too strong, the aluminum foil or copper foil on the front surface will be rapidly melted and scattered, and if it is too weak, another problem that a plurality of aluminum foils or copper foils cannot be reliably welded occurs.

The present invention has been made in order to cope with such a situation, and the connection portion of the current collector connection plate and the plurality of metal collector metal foils of the electrodes of the power generating element are superposed and sandwiched between the sandwich plates. An object of the present invention is to provide a battery in which the plurality of collector metal foils can be reliably welded to the collector connection plate by being welded.

[0008]

According to a first aspect of the present invention, there is provided a battery according to claim 1, wherein a plurality of current collecting metal foils each having a connecting portion of a metal current collecting and connecting plate fixed to a terminal and an electrode protruding from an end face of the power generating element. And a combination of and are sandwiched between the facing portions of the sandwiching plate made of a metal plate thinner than the current collecting and connecting plate, the plate surfaces facing each other, and joined by welding.

According to the first aspect of the present invention, a sandwiching plate, in which the connection portion of the current collecting connection plate and the plurality of metal collecting metal foils of the electrodes of the power generating element are stacked, is thinner than the current collecting connection plate. Since it is sandwiched between the facing parts and joined by welding, the energy of ultrasonic welding etc. can be sufficiently transmitted to the current collecting metal foil through the facing parts, and the current collecting metal foils can be reliably connected. Be able to weld to the connection of the plates. Moreover, since the sandwiching plate, which is a metal plate, is sufficiently thicker than the current collecting metal foil, energy such as ultrasonic welding is directly applied to the current collecting metal foil, so that the current collecting metal foil on the surface is rapidly melted and scattered. There is no fear that welding will become difficult due to breakage or breakage.

In the present invention, the plurality of electrodes of the current collecting metal foil means that the current collecting metal foils are also individual by laminating a plurality of individual electrodes like a laminated power generating element. Besides the case where a plurality of sheets are overlapped, the case where the current collecting metal foils of the same electrode are overlapped with each other by winding or bending one electrode is also included.

In the battery of claim 2, the connection portion of the current collecting connection plate is formed by bending the edge portion of the current collecting connection plate, or the current collecting connection plate is punched out, and the punched piece is formed. Is partly bent while being connected to the main body side of the current collector / connector plate, and one opposing part of the sandwiching plate having a U-shaped cross section is arranged adjacent to the back side of this connecting part, and the other It is characterized in that the facing portion is arranged adjacent to the antinode side of this connection portion through the opening formed in the main body side of the current collection connection plate with the current collecting metal foil interposed therebetween.

According to the second aspect of the present invention, the connection piece is formed by bending the end piece and the punched piece of the current collector connection plate.
Since an opening is formed next to this, one opposing portion of the sandwiching plate having a U-shaped cross section is arranged on the outer side of the current collector connecting plate or on the back side of the connecting portion through the punching hole, and the other opposing portion is It can be arranged on the ventral side of the connection portion through the opening hole, and the collector connection plate and the sandwiching plate can be manufactured by a simple sheet metal working.

The opening formed next to the connecting portion may be a punched hole punched to form another connecting portion, and in the case of forming a plurality of connecting portions on the current collector connecting plate. It is possible to use these openings and punched holes as well.

The battery according to claim 3 is a plate surface which overlaps with the current collecting metal foil in the connection portion of the current collecting connection plate, and / or
It is characterized in that convex portions are formed on plate surfaces facing each other of the sandwiching plate.

According to the third aspect of the present invention, since the convex portion is formed on the current collector connection plate and the sandwiching plate, the energy for ultrasonic welding or the like is concentrated on the convex portion to perform more reliable welding. Will be able to.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 shows a structure in which an aluminum foil of a positive electrode protruding from the lower end surface of a power generating element is connected to a connecting portion of a current collector connecting plate. FIG. 2 is a partially enlarged vertical cross-sectional view showing a configuration of a holding plate and a connecting portion of a positive electrode side current collecting and connecting plate, and FIG. 3 is a configuration of a holding plate and a connecting portion of a negative electrode side current collecting and connecting plate. FIG. The constituent elements having the same functions as those of the conventional example shown in FIG.

In this embodiment, a large non-aqueous electrolyte secondary battery used in an electric vehicle or the like will be described as in the conventional example. This non-aqueous electrolyte secondary battery, as shown in FIG.
The positive electrode 1a and the negative electrode 1b of the elliptic cylindrical winding type power generating element 1 are connected to the positive electrode terminal 3 and the negative electrode terminal 4 via the collector connection plates 5 and 6, and the structure of the power generating element 1 is the same as the conventional example. Is.

The current collector connection plate 5 on the positive electrode side is also made of an aluminum plate as in the conventional example, is arranged on the lower end surface of the power generating element 1, and has side edges along the outer peripheral side surface of the power generating element 1. Have been pulled out. However, the U-shaped portion 6a shown in FIG. 4 is not formed in the current collector connection plate 5 of the present embodiment, and as shown in FIGS. 1 and 2, the opening portions 5b and 5c and the connection portions 5d and 5e are formed. Are formed. Openings 5b, 5
c is a flat main body arranged on the lower end surface of the power generation element 1 (not shown in FIG. 2) in the collector connection plate 5 at the end side (FIG. 1).
Is a punched hole formed side by side from the right side, the upper left side in FIG. Then, the opening 5b on the end side is punched out in a U-shape to leave the side of the punched piece on the side opposite to the end connected. The other opening 5c adjacent to the opening 5b is punched out in a rectangular shape with a width narrower than that of the opening 5b. The connection portion 5d is formed by bending a plate piece at an end portion of a flat main body, which is arranged on the lower end surface of the power generation element 1 in the current collection connection plate 5, at a right angle toward the upper side, and the end portion side of the opening portion 5b. It is bent at a position where the end of is slightly hooked. The other connecting portion 5e adjacent to the connecting portion 5d is formed by bending a punching piece that remains connected when the opening 5b is punched and is bent upward at a right angle. Opening 5
The c is formed at a position where the end on the end side is slightly bent together with the connecting portion 5e.

The connection portions 5d and 5e of the current collector connection plate 5 are
It is sandwiched between the sandwiching plates 7 and 8, respectively. The sandwiching plates 7 and 8 used in the positive electrode side current collecting and connecting plate 5 are the current collecting and connecting plate 5
It is made of the same aluminum plate as the above, and is formed by bending a square plate material into a U-shaped cross section so that the facing plate surfaces become facing parts. The sandwiching plates 7 and 8 are made of aluminum plates which are thinner than the current collecting and connecting plate 5. That is, in the present embodiment, since the aluminum plate having the plate thickness of 0.8 mm is used as the collector connection plate 5, the sandwiching plates 7 and 8 have a plate thickness of 0.2 m which is sufficiently thinner than this.
m aluminum plate is used. Further, the holding plate 7 is
The holding plate 8 is formed to be slightly narrower than the opening 5b.
Is formed to be slightly narrower than the opening 5c narrower than the opening 5b so that one of the opposing portions can be inserted into these openings 5b, 5c.

Convex portions 5f, 7a and 8a are formed on the opposing portions of the connecting portions 5d and 5e and the sandwiching plates 7 and 8, respectively. The convex portions 5f of the connection portions 5d and 5e are formed so as to project from the surface on the ventral side (the inner side of the bend), respectively. Further, the convex portions 8a of the sandwiching plates 7 and 8 are formed so as to project from both facing surfaces of the facing portions. These protrusions 5f, 7a, 8a are protrusions having a columnar shape, a prismatic shape, a hemispherical shape or the like slightly protruding from the plate surface. The protrusions 7a and 8a of the sandwiching plates 7 and 8 are projections of 3 mm, which are 0.2 mm, which is the same as the plate thickness. In this embodiment,
In order to form these convex portions 5f, 7a, 8a, since pressing is performed from the surface on the opposite side of the aluminum plate by pressing, the back side (outside of bending) of the connecting portions 5d, 5e and the sandwiching plate. A concave portion is formed on the outer surface of the facing portion of 7 and 8 by this press working.

The sandwiching plate 7 is arranged so as to sandwich the connecting portion 5d by inserting one opposing portion into the opening 5b from below. That is, one facing portion of the sandwiching plate 7 is arranged on the back side of the connecting portion 5d, and the other facing portion is arranged on the belly side of the connecting portion 5d. Further, the sandwiching plate 8 is arranged so as to sandwich the connecting portion 5e by inserting one facing portion from below into the opening 5b and inserting the other facing portion into the opening 5c. That is, one facing portion of the sandwiching plate 8 is arranged on the back side of the connecting portion 5e, and the other facing portion is arranged on the belly side of the connecting portion 5e.

The holding plates 7 and 8 are, as shown in FIG.
Between the other facing portion and the connecting portions 5d and 5e, the power generating element 1
While sandwiching a plurality of aluminum foils of the positive electrode 1a protruding from the lower end surface of the positive electrode 1a, the positive electrode 1a is welded by ultrasonic welding from the outside of both facing portions. At this time, ultrasonic vibrations are sufficiently transmitted to the aluminum foils of the plurality of positive electrodes 1a through the other facing portions of the thin sandwiching plates 7 and 8, so that these aluminum foils are reliably welded to each other, and Will be surely welded to the inner surface of the facing portion and the ventral surfaces of the connecting portions 5d and 5e. Also, the holding plates 7 and 8
The inner surface of one of the facing portions is reliably welded to the back surface of each of the connecting portions 5d and 5e by ultrasonic vibration.
Moreover, the inner surfaces of the opposing portions of the sandwiching plates 7 and 8 and the connecting portion 5
Since the convex portions 5f, 7a, 8a are formed on the ventral side surfaces of d, 5e, ultrasonic vibrations are generated on the convex portions 5f, 7a, 8a.
8a can be concentrated, and welding can be made more reliable. Further, if the sandwiching plates 7 and 8 sandwich the aluminum foils of the plurality of positive electrodes 1a against the connecting portions 5d and 5e due to the elasticity between the facing portions, the positive electrodes 1a and the current collector can be collected before the ultrasonic welding. Since the connection plate 5 can be connected by pressure welding, even if there is an incomplete portion in welding or the welded portion peels off during use of the non-aqueous electrolyte secondary battery, The connection will never be completely broken.

Similarly to the conventional example, the collector connection plate 6 on the negative electrode side is also made of a copper plate and is arranged on the upper end surface of the power generating element 1. Then, like the current collector connection plate 5 on the positive electrode side, the current collector connection plate 6 also has openings 6b and 6c and a connection part 6 as shown in FIG.
d and 6e are formed. However, the connecting portions 6d and 6e
In order to connect to the copper foil of the negative electrode 1b projecting on the upper end surface of the power generation element 1, the flat body end of the current collector connection plate 6 and the punched piece of the opening 6b are bent downward at a right angle. ing. These connecting portions 6d and 6e are designed to be sandwiched between the sandwiching plates 9 and 10 by overlapping with the copper foil of the negative electrode 1b. The sandwiching plates 9 and 10 have exactly the same shape as the sandwiching plates 7 and 8 used for the positive electrode side current collecting and connecting plate 5, but use the same copper plate as the negative electrode side current collecting and connecting plate 6. Also,
A copper plate having a smaller thickness than the collector connection plate 6 is used for the sandwiching plates 9 and 10. That is, in the present embodiment, since a copper plate having a plate thickness of 0.8 mm is used as the current collector connection plate 6, a 0.2 mm copper plate having a plate thickness sufficiently smaller than this is used for the sandwiching plates 9 and 10. To be Further, convex portions 6f, 9a, 10a similar to those on the positive electrode side are also formed on the facing portions of the connecting portions 6d, 6e and the sandwiching plates 9, 10, respectively.

The sandwiching plate 9 is arranged so as to sandwich the connecting portion 6d by inserting one opposing portion into the opening 6b from above. That is, one facing portion of the sandwiching plate 9 is arranged on the back side of the connecting portion 6d, and the other facing portion is arranged on the belly side of the connecting portion 6d. Further, the sandwiching plate 10 is arranged so as to sandwich the connecting portion 6e by inserting one facing portion into the opening portion 6b from above and inserting the other facing portion into the opening portion 6c. That is,
One facing portion of the sandwiching plate 10 is arranged on the back side of the connecting portion 6e, and the other facing portion is arranged on the belly side of the connecting portion 6e.

The sandwiching plates 9 and 10 are also sandwiched by a plurality of copper foils of the negative electrode 1b protruding from the upper end surface of the power generating element 1 between the other facing portion and the connecting portions 6d and 6e. Is welded by ultrasonic welding from the outside of the facing portion. Therefore, similar to the case of the collector connection plate 5 on the positive electrode side, this ultrasonic welding surely welds the plurality of copper foils to each other, and at the same time, the inner surface of the other facing portion and the connecting portion 6 are connected.
It will be surely welded to the ventral surfaces of d and 6e. Further, the inner surface of one of the opposing portions of the sandwiching plates 9 and 10 is reliably welded to the rear surface of the connection portions 6d and 6e by ultrasonic vibration. Moreover, the ultrasonic vibrations can be concentrated on the convex portions 6f, 9a, 10a formed on the inner surfaces of the opposing portions of the sandwiching plates 9, 10 and the ventral surfaces of the connecting portions 6d, 6e, and welding can be further performed. You will be able to make sure. Furthermore, due to the elasticity between the opposing portions of the sandwiching plates 9 and 10, the copper foils of the plurality of negative electrodes 1b are connected to the connecting portions 6d,
If it is sandwiched so as to be pressed against 6e, even if there is an incomplete portion in welding or the welded portion peels off, the connection will not be completely cut off.

With the above structure, the energy of ultrasonic welding is applied to the electrode 1 via the sandwiching plates 7, 8, 9 and 10 having a thin plate thickness.
Since it is sufficiently transmitted to the collector metal foils (aluminum foil and copper foil) of a and 1b, a plurality of collector metal foils are reliably welded to the connection portions 5d, 5e, 6d and 6e of the collector connection plates 5 and 6. You will be able to. Moreover, these extremely thin current collecting metal foils are ultrasonically welded through the sandwiching plates 7, 8, 9, 10 made of metal plates sufficiently thicker than this, so that the energy of this ultrasonic vibration is There is no possibility that the collector metal foil on the surface suddenly melts and scatters or breaks when it is directly received, which makes welding difficult.

In the above embodiment, the present invention is applied to both the positive electrode side current collecting and connecting plate 5 and the negative electrode side current collecting and connecting plate 6, but either one of the polar side current collecting plates is used. It is also possible to simply carry out on the connection plate. Further, in the above-described embodiment, the case where the connection portions 5d and 5e or the connection portions 6d and 6e are formed at two locations on each of the current collector connection plates 5 and 6 has been described.
This connecting portion may be formed in only one place on the current collecting and connecting plate, or may be formed in three or more places.

Further, in the above embodiment, the sandwiching plates 7, 8, 9, 10 having a U-shaped cross section are shown, but the plate surface for sandwiching the connection part of the current collecting connection plate and the current collecting metal foil is shown. Any shape may be used as long as it is a metal plate material having facing portions facing each other. Further, in the above embodiment, the holding plates 7, 8, 9, 10 are connected to the electrodes 1a, 1b.
Although the case of sandwiching the collector metal foil from the side opposite to the side where the collector metal foil is inserted is shown, the sandwiching direction is also optional depending on the shape of the sandwich plate. For example, the sandwiching plate 7 shown in FIG. 2 has a shape in which opposing portions whose plate surfaces face each other are connected at the lower end,
It is also possible to form a holding plate having a shape such that these facing parts are connected at the side ends, and to insert this from the side of the connecting part. Moreover, if the sandwiching plate is configured in this way, it is not necessary to form an opening for inserting the facing part in the current collecting and connecting plate.

In the above embodiment, a plurality of electrodes 1 are used.
The case where the connecting portions 5d, 5e, 6d, 6e of the collector connection plates 5, 6 are arranged on the outer side where the collector metal foils a, 1b are overlapped with each other has been described. This connection can also be arranged. In this case, welding is performed by sandwiching the collector metal foil between the opposing portions of the sandwiching plate and the connecting portion of the collector connecting plate. However, when forming a convex portion on the connecting portion of such a current collecting and connecting plate, it is preferable that the convex portion is provided so as to project from both surfaces of the connecting portion.

Further, in the above embodiment, the current collecting and connecting plate 5,
6 of the connecting portions 5d, 5e, 6d, 6e and the convex portions 7a, 8a, 9 of the opposing portions of the sandwiching plates 7, 8, 9, 10.
Although the case where a and 10a are columnar, prismatic, or hemispherical protrusions is shown, they can be elongated straight lines or curved or bent ridge-shaped protrusions, and a plurality of ridge-shaped protrusions intersect each other. It is also possible to form it in the shape of a mesh. Further, such a convex portion may not be provided at the connecting portion of the current collector connecting plate or the facing portion of the sandwiching plate.

Further, in the above embodiment, the collector connection plate 5,
The plate pieces bent from the body of 6 are connected to the connecting portions 5d, 5e, 6
Although the case of d and 6e is shown, the end portion of the plate material of the current collector connection plate may be used as the connection portion without being bent. Furthermore, any other part of the main body of the current collecting and connecting plate can be used as the connecting portion. For example, the central portion of the main body of the flat current collecting and connecting plate may be used as the connecting portion, or one side wall of the U-shaped portion bent into a corrugated plate shape may be used as the connecting portion as in the conventional case.

Further, in the above embodiment, the current collecting and connecting plate 5,
The case where the connection portions 5d, 5e, 6d, 6e of 6 and the current collecting metal foil of the electrodes 1a, 1b and the sandwiching plates 7, 8, 9, 10 are welded by ultrasonic welding has been described. It can also be joined by other welding means.

Further, in the above-described embodiment, the elliptic cylindrical winding type power generating element 1 has been described, but the present invention is not limited to the long cylindrical winding type power generating element, and may be a winding type power generating element of any shape. It can be carried out, and can be similarly carried out to other types of power generating elements such as a laminated type. For example, in the case of a cylindrical winding-type power generation element, a sufficiently wide connection area can be obtained by bending the connection portion of the current collecting and connecting plate along the electrodes, and the sandwiching plate is also a curved plate. It is sufficient to use one having opposing portions whose surfaces face each other. As the power generation element other than the wound type and the laminated type, for example, one or both electrodes may be alternately bent and overlapped.

Further, in the above embodiment, the non-aqueous electrolyte secondary battery has been described, but the type of battery is not limited to this, and the current collecting and connecting plates 5 and 6 and the sandwiching plates 7 and 8,
Metal materials such as 9 and 10 can be arbitrarily selected according to the type of the battery.

[0036]

As is apparent from the above description, according to the battery of the present invention, the energy of ultrasonic welding or the like can be transmitted to the collector metal foil through the sandwiching plate, so that a plurality of collectors can be collected. It becomes possible to reliably weld the metal foil to the connection portion of the current collector connection plate.

[Brief description of drawings]

FIG. 1 is a partially enlarged vertical cross-sectional view showing an embodiment of the present invention, showing a structure in which a positive electrode aluminum foil projecting from a lower end surface of a power generation element is connected to a connection portion of a current collector connection plate. .

FIG. 2 shows an embodiment of the present invention and is a perspective view showing a configuration of a holding plate and a vicinity of a connection portion of a collector connection plate on a positive electrode side.

FIG. 3 shows an embodiment of the present invention, and is a perspective view showing a configuration of a sandwiching plate and the vicinity of a connection portion of a negative electrode side current collecting and connecting plate.

FIG. 4 is a perspective view showing a conventional example and showing a connection structure example of an electrode and a terminal of an elliptic cylinder winding type power generation element.

[Explanation of symbols]

1 power generation element 1a positive electrode 1b negative electrode 3 Positive terminal 4 Negative electrode terminal 5 Current collector connection plate 5b opening 5c opening 5d connection 5e connection part 5f convex part 6 Current collector connection plate 6b opening 6c opening 6d connection 6e connection part 6f convex part 7 clamping plate 7a convex part 8 clamping plate 8a convex part 9 clamping plate 9a convex part 10 clamping plate 10a convex part

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Claims (3)

[Claims] 1. A current collector comprising: a connection portion of a metal current collector connection plate, which is fixedly connected to a terminal, and a plurality of current collector metal foils of electrodes protruding from an end face of a power generating element, which are superposed. A battery characterized in that a sandwiching plate made of a metal plate thinner than a connecting plate is sandwiched between opposing portions of plate surfaces facing each other and joined by welding. 2. The connecting portion of the current collecting and connecting plate is formed by bending an end edge portion of the current collecting and connecting plate, or the current collecting and connecting plate is punched and a part of the punched piece is collected. It is bent while being connected to the main body side of the electrical connection plate.One facing part of the sandwiching plate with a U-shaped cross section is arranged adjacent to the back side of this connecting part, and the other facing part is used for current collection. The battery according to claim 1, wherein the battery is arranged so as to be adjacent to the abdominal side of this connecting portion through an opening formed in the main body side of the connecting plate with a current collecting metal foil interposed therebetween. 3. A convex portion is formed on a plate surface of the connecting portion of the collector connecting plate which overlaps the collector metal foil, and / or a facing plate surface of the facing portion of the sandwiching plate. The battery according to Item 1 or 2.