JP2002237326A - Manufacturing method of winding type battery and wound-type battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding type battery easy to manufacture and wherein enhancement of output power efficiency can be carried out without inviting fluctuation increase of internal resistance. SOLUTION: Winding of the first electrode sheet 12 is started from the first active material non-carrying part 12b of the first electrode sheet 12 with a winding shaft core 10 as a shaft, and after it is wound for prescribed times, the second electrode sheet 16 pinched by the separator sheets 14a, 14b is lap- wound onto the first electrode sheet 12. Then, after the first electrode sheet 12 is finished with the winding, the winding of the second electrode sheet 16 is continued for prescribed times and the surface of a winding member 18 is covered by the second active material non-carrying part 16b protruding from the separator sheets 14a, 14b. Then, the winding member 18 is inserted into a container having at least an electroconductive part in an inner wall and the second active material non-carrying part 16 are made to be contacted with the electroconductive part. Finally the winding type battery is completed while the winding coaxial core 10 is taken as the first electrode terminal and the electroconductive part of the container as the second electrode terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a wound type battery and a wound type battery, and more particularly, to a method for manufacturing the wound type battery which can be easily manufactured, and which can reduce internal resistance and improve output efficiency. The present invention relates to a method of manufacturing a wound battery and an improvement of the wound battery.

[0002]

2. Description of the Related Art Conventionally, various structures of a wound type battery, for example, a cylindrical lithium ion secondary battery (hereinafter, simply referred to as a battery) have been proposed to improve performance and reduce manufacturing cost.

[0003] For example, Japanese Patent Application Laid-Open No. H10-64588 discloses a wound shaft core formed by connecting two metal rods having slits in the axial direction in the axial direction via an insulating member.
First, wind an insulating separator sheet around the winding shaft,
Thereafter, a positive electrode plate (sheet) and a negative electrode plate (sheet), which are mutually insulated by a separator sheet, are wound. A plurality of current collecting tabs are welded to the positive electrode plate and the negative electrode plate, respectively, and a current collecting tab for the positive electrode plate is welded to one of the metal bars separated by the insulating member of the winding shaft to form a positive electrode terminal. Then, the negative electrode current collecting tab is welded to the other metal bar to form a negative electrode terminal. By separating the winding shaft core with an insulating member and using it as a positive electrode terminal and a negative electrode terminal, winding of the positive electrode plate and the negative electrode plate can be performed easily, and collective connection of current collecting tabs, especially welding work can be performed. This can be easily performed, and the manufacturability can be improved.

[0004]

However, in the case of the battery manufactured by the above-described manufacturing method, the connection between the winding shaft core and the positive electrode plate and the negative electrode plate is made through a current collecting tab. The current collecting tabs need to be individually connected to the metal rods constituting the winding shaft core, and there is a problem that the connection work is complicated. In particular, in such a structure, since the connection between the current collecting tab and the metal rod body is performed by welding, each welding operation also adds to the complexity of the operation. Further, in the welded portion, an increase in internal resistance occurs, which causes a problem that the performance of the battery is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is a method of manufacturing a wound type battery that can be easily manufactured and that can improve output efficiency without increasing internal resistance. And a wound type battery.

[0006]

In order to achieve the above object, the present invention provides a first electrode sheet and a second electrode formed by supporting an active material on a part of the surface of a conductive sheet. A method for manufacturing a wound type battery comprising winding a sheet in a state where the sheets are opposed to each other with a separator sheet interposed therebetween, wherein the winding of the first electrode sheet in the longitudinal direction is started around a conductive shaft. A step of starting winding the first electrode sheet from the first active material non-supported portion formed at the end, and after winding the first active material non-supported portion a predetermined number of times, the first electrode sheet A step of starting the overlapping winding of the second electrode sheet sandwiched between the separator sheets, and after the winding of the first electrode sheet is completed, continuing the winding of the second electrode sheet sandwiched between the separator sheets a predetermined number of times, The second electrode sheet protruding from the sheet Step of covering the surface of the wound body with the second active material non-supported portion formed at the longitudinal direction winding end end of the g, winding the surface covered with the second active material non-supported portion, at least A step of inserting the container into a container having a conductive portion on the inner wall surface and bringing the conductive portion and the second active material-unsupported portion into contact with each other; and a step of using the conductive shaft as a first electrode terminal; Using the conductive portion as a second electrode terminal.

In order to achieve the above object, a wound type battery according to the present invention has a conductive shaft core and an active material supported on a part of the surface thereof, and can be wound around the conductive shaft core. A conductive electrode sheet, a first electrode sheet capable of starting to be wound around the conductive shaft core from a first active material unsupported portion formed at a longitudinal winding start end, and the first active material. An electrode sheet that can be overlapped with the first electrode sheet after the unsupported portion has been wound a predetermined number of times and has an active material supported on a part of its surface, and has a second active material unfinished at the end end in the longitudinal direction. A second electrode sheet having a supporting portion, a separator sheet capable of sandwiching the second electrode sheet and maintaining an insulating state with respect to the first electrode sheet and exposing only the second active material non-supporting portion, The first electrode sheet and the second electrode wound on the conductive shaft core A container having a conductive portion on at least an inner wall surface capable of storing a sheet and a separator sheet and capable of contacting the second active material-unsupported portion at the end of the winding; and The characteristic part is a pole terminal of the battery.

Here, one of the first electrode sheet and the second electrode sheet is for a positive electrode and the other is for a negative electrode, and is made of, for example, aluminum foil or copper foil. Similarly, the conductive shaft core is made of, for example, an aluminum material or a copper material. At this time, the electrode sheet wound first around the conductive shaft core may be for a positive electrode or a negative electrode. Further, the separator sheet sandwiched from the front and back sides of the second electrode sheet is made of, for example, polyethylene or polypropylene, and the sandwiching of the second electrode sheet may be performed by an independent separator sheet or a single large-sized separator. The sheet may be folded to sandwich the second electrode sheet.

According to this configuration, the first electrode sheet can be wound around the conductive shaft core and can be electrically connected at the same time.
The second electrode sheet is completely wound and inserted into the container, thereby completing the electrical connection with the conductive portion of the container. And since the conductive shaft core and the conductive portion of the container can be used as pole terminals of the battery as they are, no complicated connection work is performed, and connection work such as welding is performed for forming the pole terminals. Since it is not required, a wound type battery can be easily obtained without causing fluctuation or increase in internal resistance.

In order to achieve the above object, in the above-mentioned manufacturing method, the wound state of the wound body covered with the second active material unsupported portion is maintained, and the conductive portion of the container is maintained. And a step of mounting a conductive winding member for maintaining contact with the conductive winding member.

In order to achieve the above object, in the above-mentioned wound type battery, the wound state of the first electrode sheet, the second electrode sheet, and the separator sheet wound around the conductive shaft core is provided. And a contact between the second active material non-supported portion and the conductive portion is obtained via the wound member.

Here, the conductive winding member is, for example,
A spiral shaped body, O-shaped ring, C-shaped ring, etc., which is made of aluminum or copper and adheres tightly to the wound body, prevents unwinding of the wound body and adheres closely to the conductive part of the inner wall of the container. is there.

According to this configuration, the first electrode sheet, the second electrode sheet, and the separator sheet wound around the conductive shaft core are prevented from being unwound by mounting the winding member, and the second electrode sheet is unwound. Good contact with the conductive portion of the inner wall of the container can be obtained.

Further, in order to achieve the above object, in the above-mentioned manufacturing method, a step of forming a convex portion on a conductive portion of an inner wall surface of the container is included, and the portion is covered with the portion not supporting the second active material. By press-fitting the wound body into the container, the wound state of the wound body is maintained, and the contact with the conductive portion of the container is maintained.

In order to achieve the above object, in the above-mentioned wound type battery, the inner wall surface of the container has a conductive convex portion, and the inner wall surface of the container is wound around the conductive shaft core. The rolled state is maintained by press-fitting the one electrode sheet, the second electrode sheet, and the separator sheet into the container, and the contact with the conductive portion of the container is maintained.

Here, the convex portion is formed, for example, by applying an external force from the outer wall surface of the container, and the shape of the convex portion may be a shape protruding individually in a mountain shape or a convex shape continuous in a band shape. Good. When the convex portion is formed in a band shape, it may have a spiral shape along the inner wall surface of the container, a ring shape formed in the circumferential direction of the container, or a linear shape formed in the axial direction of the container. May be.

According to this configuration, the first electrode sheet, the second electrode sheet, and the separator sheet wound around the conductive shaft core by forming the convex portion on the container can be unwound simply by inserting into the container. In addition to the prevention, it is possible to maintain good contact between the second electrode sheet and the conductive portion of the inner wall of the container.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.

FIGS. 1 and 2 are schematic diagrams illustrating the structure and manufacturing method of a wound type battery (hereinafter simply referred to as a battery) of the present embodiment. The battery according to the present embodiment is roughly classified into a wound shaft core 10, a long strip-shaped first electrode sheet 12 first wound around the wound shaft core 10, and a separator sheet 14.
a, 14b, the first electrode sheet 1
2 and a container 20 for accommodating the wound body 18 after the winding of each sheet is completed.

The winding shaft core 10 is a conductive shaft core formed of a conductive material, and is preferably made of a material serving as a base of the first electrode sheet 12 wound first, for example, aluminum. It is configured. Specifically, as shown in FIG. 1A, a shaft body (for example, a cylindrical shape) 10a and a holding plate 1
0b, the shaft main body 10a is formed with a slit 10c for sandwiching the winding start portion of the first electrode sheet 12, and the holding plate 10b is formed with an opening 10d used as an electrolyte solution injection hole to be described later. ing. This opening 10d
As shown in FIG. 1A, there is provided a rotating means connected when the first electrode sheet 12 or the like is driven to be wound around the winding shaft core 10, for example, a rotating shaft 2 of a winding motor 22.
An engaging pin 22b protruding from 2a is engaged. Figure 1
(A) As shown in FIG.
By supporting the shaft 2 and the bearing 24, the winding shaft core 10 can be rotated.

The first electrode sheet 12 wound first around the rotating shaft core 10 may form the positive electrode or the negative electrode, but in the present embodiment, the first electrode sheet 12 forms the positive electrode. The case where the positive electrode is formed will be described.

When a positive electrode is formed on the first electrode sheet 12, the material serving as a base of the first electrode sheet 12 is, for example,
It can be aluminum. This aluminum foil carries a first active material 12a that causes an electrochemical reaction of charging and discharging of the battery. Usually, the positive electrode side carries a substance to be an oxidizing agent. In the case of the present embodiment, the winding start end portion in the longitudinal direction that is the start of winding the first electrode sheet 12 is
The first active material non-supporting portion 12b which does not support the first active material and exposes the base aluminum foil is formed.

The separator sheets 14a and 14b are sheet-like materials that separate the first electrode sheet 12 and the second electrode sheet 16 so that they do not come into direct contact with each other. It is porous and has no electronic conductivity (it can transmit lithium ions) and is made of, for example, polyethylene or polypropylene. Although FIG. 1A shows an example in which two independent separator sheets 14a and 14b are used, it is sufficient that the insulating state between the first electrode sheet 12 and the second electrode sheet 16 be maintained. For example, a large-sized separator sheet may be bent substantially in the center along the winding direction, and the second electrode sheet 16 may be sandwiched inside the sheet.

When the first electrode sheet 12 forms a positive electrode, the second electrode sheet 16 forms a negative electrode. Similarly to the first electrode sheet 12, the second electrode sheet 16 may be made of any material as a base as long as it is a conductive strip-shaped sheet. However, the material of the inner wall portion of the container 20 and the member for extracting the negative electrode are used. It is preferable to match the material, and for example, a copper foil or the like can be used. This copper foil also serves as a second active material 16a that causes an electrochemical reaction of charging and discharging of the battery.
Is carried. Usually, the negative electrode side carries a substance to be a reducing agent. In the case of the present embodiment, the second electrode sheet 1
The end portion of the winding end in the longitudinal direction, which is the end of winding of No. 6, does not support the second active material, and is formed with a second active material non-supporting portion 16b in which the copper foil serving as the base is exposed (FIG. )reference). In the present embodiment, the first electrode sheet 12, the second electrode sheet 16, and the like are hatched so that the sheets can be easily distinguished.

The procedure for winding the battery body (winding body 18) having such a configuration will be described first.

As described above, the winding shaft core 10 is
As shown in FIG.
Set to. Subsequently, the first active material-unsupported portion 12b of the first electrode sheet 12 is inserted into the slit 10c of the winding shaft core 10, and the winding motor 22 is driven to rotate in a predetermined direction,
A predetermined number of times (for example, three rotations), the first active material unsupported portion 12
b is wound around the winding shaft core 10. As a result, the winding shaft core 1
0 is directly connected to the first electrode sheet 12 and becomes an electrode (in the present embodiment, it becomes a positive electrode). At this time, the material of the winding shaft core 10 and the material of the base of the first electrode sheet 12 (the first active material non-supporting portion 12b) are made the same, and connection means such as welding is used to increase the internal resistance. Since the electrodes can be formed without any change, it is possible to prevent the fluctuation of the internal resistance and to improve the output efficiency of the battery.

Subsequently, the first electrode sheet 12 and the winding axis 1
The separator sheet 14a is inserted between the sheet and the 0 side, and the winding operation is continued. Subsequently, the second electrode sheet 16 is inserted between the separator sheet 14a and the winding shaft core 10 to continue the winding operation. Finally, the separator sheet 14b
Is inserted between the second electrode sheet 16 and the winding shaft core 10 to continue the winding operation to form a wound body 18. At this time, in the wound body 18, the first electrode sheet 12 and the second electrode sheet 16 face each other via the separator sheets 14a and 14b. In general, in batteries, the width of the negative electrode is often larger than the width of the positive electrode for safety measures. for that reason,
When the second electrode sheet is used as the negative electrode, the second active material supporting portion 16a of the second electrode sheet 16 is preferably larger than the first active material supporting portion 12a of the first electrode sheet 12.

In this embodiment, the first electrode sheet 1
2, the length of the separator sheets 14a, 14b and the second electrode sheet 16 is such that the first electrode sheet 12, the separator sheets 14a and 14b, and the second electrode sheet 16 are wound in this order as shown in FIG. When the winding is completed and the winding is completed, it is necessary to set the second active material unsupported portion 16b of the second electrode sheet 16 projecting from the separator sheets 14a and 14b so as to cover the outer peripheral surface of the wound body 18. is there.
By performing such setting, the first electrode sheet 12
The second active material non-supporting portion 16b of the second electrode sheet 16 insulated from the second active material can be an electrode (in the present embodiment, a negative electrode), and the wound body 18 is completed.

Next, a procedure for inserting the completed wound body 18 into the container 20 to complete the battery will be described. First, each sheet (first electrode sheet 1) constituting the completed wound body 18
2, in order to prevent unwinding of the separator sheets 14a, 14b and the second electrode sheet 16 (maintaining a wound state), as shown in FIG. 2A, a conductive winding having a spiral shape. The member 26 is mounted. This winding member 26 is preferably made of the same material as the material of the base of the second electrode sheet 16 (the second active material non-supporting portion 16b). In the case of the present embodiment, it is preferably made of copper. The winding member 26 may be formed by winding a plastically deformable copper wire material, or may be mounted in a coil shape in accordance with the diameter of the wound body 18 in advance. The shape of the winding member is arbitrary as long as it prevents unwinding of the winding body 18 and allows electrical connection between the container 20 described below and the second active material unsupported portion 16b. For example, an O-ring shape or a C-ring shape may be used.

Subsequently, as shown in FIG.
The wound body 18 that has been unwound to 0 is inserted. The container 20 needs to have a conductive portion on at least a part of the inner wall surface. For example, even if the surface of the container is made of resin or the like, the inner wall surface may be made of a conductive member, for example, copper or the like. Further, it is not necessary that the entire inner wall surface is made of a conductive member, and a part of the inner wall surface may have conductivity. In the case of the present embodiment, an example in which the entire container 20 has a bottomed cylindrical shape formed of a conductive member (for example, the same copper material as the base of the second electrode sheet 16) and having an open end 20a at one end. Is shown. First, an insulating plate 28 (for example, made of polypropylene) is inserted in order to avoid electrical connection between the tip of the shaft main body 10a of the winding shaft core 10 and the container 20, and then, the winding body 18 is inserted. . At this time, wound body 1
When the winding member 26 attached to the outer periphery of the container 8 and the inner wall surface of the container 20 come into contact with each other, the entire container 20 becomes an electrode (in the present embodiment, a negative electrode). Second electrode sheet 1
6. The winding member 26 and the container 20 are all formed of the same material, and there is no inclusion of another substance between them, and no joining means such as welding to increase the internal resistance is used. Therefore, the electrodes can be formed while suppressing the fluctuation of the internal resistance. In addition, the wound body 18 to which the winding member 26 is attached is pressed into the container 20, but the second active material unsupported portion 16b of the wound body 18 may be damaged due to the presence of the winding member 26. There is no.

Subsequently, a top cap 30 serving as an input / output terminal of the positive electrode and an insulating ring 3 for avoiding contact between the top cap 30 and the container 20 shown in FIG.
As shown in FIG. 2D, necking is performed near the open end 20 a of the container 20 to form a constricted portion 34 in order to mount the container 2 stably. Note that the constricted portion 34 is not indispensable, and it is sufficient that the top cap 30 and the insulating ring 32 can be stably mounted.
May be pressed into the container 20 to obtain mounting stability.

Following the necking process (before mounting the top cap 30 and the insulating ring 32), an electrolytic solution (electrolyte) is injected into the container 20. The electrolyte is supplied to the open end 2 of the container 20.
0a, it is necessary to fill the space between the respective sheets (first electrode sheet 12, separator sheets 14a and 14b, second electrode sheet 16) inside the wound body 18 with the electrolytic solution. In the case of the present embodiment, since the opening 10d with which the engaging pin 22b of the winding motor 22 engages is formed in the holding plate 10b of the winding shaft core 10 of the winding body 18, this opening 1
Through Od, the electrolyte can be easily permeated and injected between the sheets.

When the injection of the electrolyte is completed, the constricted portion 3
4, the insulating ring 32 and the top cap 30 are arranged in this order, and the tip of the insulating ring 32 and the open end 2 of the container 20 are arranged.
The front end portion of Oa is turned back to the inner peripheral side, the container 20 is sealed, and the assembly of the battery is completed. Of course, when performing the sealing process, it is necessary to interpose the insulating ring 32 so that the container 20 and the top cap 30 do not come into contact with each other.

The outer peripheral surface of the container 20 serving as a negative electrode may be exposed. However, if necessary, the container 20 is housed in an insulating housing container, and the outer peripheral surface of the container 20 is exposed from a part thereof. , A negative electrode terminal.

As described above, since the positive electrode and the negative electrode can be formed only by winding each sheet, the joining such as welding is performed to form the positive electrode and the negative electrode as in the related art. No need. As a result, it is possible to easily assemble a wound-type battery while suppressing a change (in particular, an increase) in the internal resistance of the battery.

In this embodiment, the winding shaft core 1
Although an example has been described in which the positive electrode is used on the zero side, the same effect as in the present embodiment can be obtained even when the negative electrode is used. FIG.
And the like, the separator sheets 14a and 14b, which are sequentially wound around the first electrode sheet 12, and the second electrode sheet 1
6 are sequentially inserted into the winding shaft core 10 side, that is, inside the winding,
Although an example in which winding is easily performed while preventing unwinding has been described, if the first electrode sheet 12 and the second electrode sheet 16 are configured to face each other via the separator sheets 14a and 14b, the following sheets may be used. May be inserted from the outside of the winding to perform the winding.

Further, in this embodiment, the wound body 1
The example in which the winding member 26 is used in order to prevent the unwinding of the container 8 and to obtain the electrical connection with the container 20 has been described. The convex portion 36a may be formed to receive the wound body 18 in a press-fit state. In the case of FIG. 3, since the convex portion 36 a is formed in a spiral strip, it is inserted while rotating the winding body 18 in the spiral forming direction at the time of press-fitting the winding body 18, while maintaining the wound state. , Can be easily press-fitted. Of course, the shape of the convex portion 36a is arbitrary, and may be a ring shape formed separately in the circumferential direction of the inner wall surface, a plurality of independent mountain-shaped convex portions, or a convex ridge shape extending in the container axial direction of the inner wall surface. . As described above, the projection 36a can be easily formed by applying an external force from outside the container. In addition, by partially forming the wound body 18, the insertion resistance at the time of press-fitting the wound body 18 can be easily reduced. In addition, the winding body 1 at the time of press fitting
When the insertion resistance of the outer peripheral surface of the container 8 is sufficiently taken into consideration, the inner diameter of the container having a flat inner wall surface is made substantially the same as the diameter of the winding member 18, and the winding member 26 is pressed into the non-mounted winding member 18. May be.

In this embodiment, a cylindrical wound battery is described as an example, but a wound battery such as a square pillar or a triangular pillar is formed by appropriately selecting the shape of the winding shaft. It is also possible to obtain the same effect as the present embodiment.

The manufacturing method and structure of the present embodiment are as follows:
The present invention can be similarly applied not only to the secondary battery but also to the primary battery, and the same effect can be obtained.

[0040]

According to the present invention, the first electrode sheet can be wound around the conductive shaft core and can be electrically connected at the same time. The second electrode sheet is completely wound and inserted into the container, thereby completing the electrical connection with the conductive portion of the container.
Then, the conductive shaft core and the conductive portion of the container can be used as the pole terminals of the battery as they are, without performing a complicated connection work, and eliminating connection processing such as welding, and the like. It is possible to easily obtain a wound battery without causing an increase in resistance.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a first half of a method of manufacturing a wound type battery according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating the latter half of the method of manufacturing the wound battery according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating another connection method of the wound body and the container of the wound type battery according to the embodiment of the present invention.

[Explanation of symbols]

10 winding shaft core, 12 first electrode sheet, 14a, 14
b separator sheet, 16 second electrode sheet, 18
Wound body, 20 containers, 22 take-up motors, 24 bearings, 26 wound members, 28 insulating plates, 30 top caps, 32 insulating rings.

Continued on the front page F term (reference) 5H011 AA03 AA09 CC08 DD11 FF02 5H024 AA12 BB09 CC02 DD01 DD11 DD15 EE01 5H028 AA07 BB07 BB08 CC08 CC13 EE01 5H029 AJ06 AJ14 BJ02 BJ14 CJ07 DJ14 HJ12

Claims (6)

[Claims] 1. A wound body is formed by winding a first electrode sheet and a second electrode sheet formed by supporting an active material on a part of the surface of a conductive sheet with a separator sheet interposed therebetween. A method for manufacturing a wound type battery, comprising: a first active material-unsupported portion formed at a longitudinally winding start end of the first electrode sheet around a conductive shaft core; Starting the winding of the first active material-unsupported portion, and winding the second electrode sheet sandwiched between separator sheets on the first electrode sheet, and then starting winding. After the end of the winding of the first electrode sheet, the winding of the second electrode sheet sandwiched between the separator sheets is continued for a predetermined number of times, and formed at the longitudinal end end of the second electrode sheet protruding from the separator sheet. Second active material unsupported part Covering the surface of the wound body in minutes, the wound body whose surface is covered with the second active material non-supporting portion,
Insert into a container having a conductive part on at least the inner wall surface,
A step of contacting the conductive portion and the second active material non-supporting portion; a step of using the conductive shaft as a first electrode terminal; and a step of using the conductive portion of the container as a second electrode terminal. A method for manufacturing a wound type battery, comprising: 2. The manufacturing method according to claim 1, wherein the wound state of the wound body covered with the second active material unsupported portion is maintained, and the contact with the conductive portion of the container is maintained. A method of manufacturing a wound type battery, comprising a step of mounting a flexible winding member. 3. The manufacturing method according to claim 1, further comprising a step of forming a convex portion on a conductive portion of an inner wall surface of the container, wherein the winding body covered with the second active material non-supporting portion is formed. A method for manufacturing a wound type battery, comprising: maintaining a wound state of a wound body by press-fitting the container into a container; and maintaining contact with a conductive portion of the container. 4. A conductive electrode sheet, comprising: a conductive shaft core; and a conductive electrode sheet supporting an active material on a part of a surface thereof and capable of being wound around the conductive shaft core, the first electrode member being formed at a longitudinally winding start end. A first electrode sheet capable of starting to be wound around the conductive shaft core from one active material non-supported portion, and can be wound together with the first electrode sheet after the first active material non-supported portion has been wound a predetermined number of times. An electrode sheet having an active material supported on a part of its surface, and a second electrode sheet having a second active material non-supported portion at a longitudinal end end, and capable of sandwiching the second electrode sheet. A separator sheet that maintains an insulating state with respect to the first electrode sheet and exposes only the second active material non-supporting portion; a first electrode sheet, a second electrode sheet, and a separator wound around the conductive shaft core It can store sheets and the second at the end of winding A container having at least an inner wall surface of a conductive portion capable of contacting a substance-unsupported portion, wherein the conductive shaft core and the conductive portion of the container are used as pole terminals of a battery. Type battery. 5. The battery according to claim 4, wherein a conductive winding member that maintains a winding state of the first electrode sheet, the second electrode sheet, and the separator sheet wound around the conductive shaft core is provided. A wound type battery having a contact between the second active material-unsupported portion and the conductive portion via the wound member. 6. The battery according to claim 4, wherein the inner wall surface of the container has a conductive protrusion, and the first electrode sheet, the second electrode sheet, and the separator wound around the conductive shaft core. A rolled-up battery, wherein a rolled state is maintained by press-fitting a sheet into a container, and contact with a conductive portion of the container is maintained.