JP2013098502A - Power storage device and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accomplish a power storage device in which cubic volume efficiency is excellent with respect to electrostatic capacitance and electroresistance can be reduced.SOLUTION: A power storage device comprises a first folded body 26 and a second folded body 32. The first folded body 26 is obtained by successively crest-folding and valley-folding a laminate 25 in a zigzag manner. The laminate 25 is configured by holding a strip-shaped first electrode current controller 10 between strip-shaped separators 14 folded into two. In the first electrode current controller 10, a crest-folding position and a valley-folding position are provided alternately for each predetermined width in a length direction. The second folded body 32 is obtained by successively crest-folding and valley-folding a strip-shaped second electrode current controller 12 in a zigzag manner. In the second electrode current controller 12, the crest-folding position and the valley-folding position are provided alternately for each predetermined width in the length direction. While making orthogonal a fold-back line part 28 of the first folded body 26 and a fold-back line part 34 of the second folded body 32, the laminate 25 partitioned by the fold-back line part 28 of the first folded body 26 and the second electrode current controller 12 partitioned by the fold-back line part 34 of the second folded body 32 are disposed so as to be laminated alternately.

Description

  The present invention relates to an electric storage device such as an electric double layer capacitor or a lithium ion battery having a structure in which a first electrode current collector and a second electrode current collector having different polarities are arranged to face each other with a separator interposed therebetween, and its manufacture Regarding the method.

  In an electricity storage device having a structure in which a first electrode current collector and a second electrode current collector having different polarities are arranged to face each other via a separator, in order to improve volumetric efficiency with respect to capacitance, A plurality of sheet-like first electrode current collectors formed by forming a negative electrode active material layer and a plurality of sheet-like second electrode current collectors formed by forming a positive electrode active material layer on both sides, The sheet-like separators are laminated together, and a plurality of current-collecting extraction tabs connected to each of the sheet-like first electrode current collector and the second electrode current collector are joined and laminated. In addition, a plurality of first electrode current collectors and a plurality of second electrode current collectors are connected to each other.

  However, in the case of this electricity storage device, it is necessary to connect a drawer tab to each of the plurality of sheet-like first electrode current collectors and second electrode current collectors, and the resistance value due to the connection of the drawer tabs Therefore, the structure is not suitable for large current input / output.

  Therefore, as disclosed in Japanese Patent Application Laid-Open No. 2007-180391 (Patent Document 1), “a long cathode foil (first electrode current collector) is used and the cathode foil (first electrode current collector) is used. Body) is folded in a folded shape, and a sheet-like shape is formed in a region defined by a bent portion of the cathode foil (second electrode current collector) and two flat portions formed continuously with the bent portion. An electrolytic capacitor (electric storage device) in which an anode foil (second electrode current collector) is disposed and a separator is disposed so as to face both planes of the anode foil (second electrode current collector) " Proposed.

  In the electrolytic capacitor (power storage device) of Patent Document 1, a single cathode foil (first electrode current collector) is obtained by using a cathode foil (first electrode current collector) bent in a zigzag manner. Because of the structure, it is not necessary to connect a plurality of sheet-like first electrode current collectors via the extraction tab as in the case of the above-mentioned laminated structure, and the resistance of the extraction tab can be reduced. Yes.

JP 2007-180391 A

As described above, the electrolytic capacitor (power storage device) of Patent Document 1 has a single-layer structure of the cathode foil (first electrode current collector), but the anode foil (second electrode current collector). Is made of a laminated structure of a plurality of sheet-like anode foils (second electrode current collectors), so that a plurality of sheets are connected via a drawer tab connected to each anode foil (second electrode current collector). The anode foil (second electrode current collector) needs to be connected to each other, and there still remains a problem that the resistance value increases due to the connection of the drawer tab.
In addition, since the extraction tab is connected to each anode foil (second electrode current collector), the volume efficiency is reduced by an amount corresponding to the connection volume of these extraction tabs.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a power storage device capable of reducing the electric resistance and a volumetric efficiency with respect to the capacitance and a method for manufacturing the same. There is to do.

In order to achieve the above object, an electricity storage device according to claim 1 of the present invention provides:
A stack formed by sandwiching a band-shaped first electrode current collector in which a mountain fold position and a valley fold position are alternately provided for each predetermined width in the longitudinal direction between two band-shaped separators is sequentially stacked. A first folded body folded in a zigzag shape by folding and valley folding;
A second fold obtained by sequentially folding a mountain-like and valley-folded electrode current collector, in which a mountain fold position and a valley fold position are provided alternately for each predetermined width in the longitudinal direction, and then folding into a zigzag fold. Have a tatami body,
In the state where the fold line portion of the first foldable body and the fold line portion of the second foldable body are orthogonal to each other, the laminated body defined by the fold line portion of the first foldable body, and It arrange | positions so that the 2nd electrode electrical power collector divided by the folding line part of a 2nd folding body may be laminated | stacked alternately.

An electricity storage device according to claim 2 of the present invention is
A mountain fold position and a valley fold position are alternately provided for each predetermined width in the long direction, and a pull-out tab that protrudes in the short direction from one end of a region defined by adjacent mountain fold positions and valley fold positions is long. A laminated body formed by sandwiching a band-shaped first electrode current collector provided at predetermined intervals in the scale direction between two band-shaped separators, and then folding them in a mountain-fold and valley-fold in a zigzag manner. The first fold and
Mountain fold positions and valley fold positions are alternately provided for each predetermined width in the long direction, and the drawer tabs formed at either the mountain fold position or the valley fold position are provided for each predetermined width in the long direction. A second folded body in which the band-shaped second electrode current collector provided in the plate is folded in a mountain and valley and folded in a zigzag manner.
The folding line portion of the first folding body and the folding line portion of the second folding body are orthogonal to each other, and the drawer tab of the first folding body and the drawer tab of the second folding body are opposite to each other. A laminated body defined by the folded line portion of the first folded body, and a second electrode current collector partitioned by the folded line portion of the second folded body, It arrange | positions so that may be laminated | stacked alternately.

The method for manufacturing an electricity storage device according to claim 3 of the present invention is the method for manufacturing the electricity storage device according to claim 1,
By sandwiching the band-shaped first electrode current collector between the band-shaped separators folded in half, a band-shaped laminate is formed by sandwiching the first electrode current collector between the separators. Forming a first folded body in which the body is folded in a mountain-like manner and a valley-like manner at the mountain-folding position and the valley-folding position of the first electrode current collector, and folded in a zigzag shape,
A step of forming a second folded body in which the belt-shaped second electrode current collector is folded in a mountain-folded state and a valley-folded state at the mountain-folded position and the valley-folded position, and folded in a zigzag shape;
In the state where the fold line portion of the first foldable body and the fold line portion of the second foldable body are orthogonal to each other, the laminated body defined by the fold line portion of the first foldable body, and A step of assembling the first folded body and the second folded body so that the second electrode current collectors partitioned by the fold line portions of the second folded body are alternately stacked. It is characterized by that.

A method for producing an electricity storage device according to claim 4 of the present invention is a method for producing an electricity storage device according to claim 1,
A step of forming a band-shaped laminate in which the first electrode current collector is sandwiched between the separators by sandwiching the band-shaped first electrode current collector between the band-shaped separators folded in two;
The strip-shaped laminate and the strip-shaped second electrode current collector are arranged in an orthogonal direction, and the laminate and the second electrode current collector are alternately folded, whereby the first fold is formed. At the same time as forming the tatami body and the second foldable body, the laminated body defined by the fold line portion of the first foldable body and the second electrode defined by the fold line portion of the second foldable body It has the process of laminating | stacking alternately a collector.

The method for producing an electricity storage device according to claim 5 of the present invention is the method for producing an electricity storage device according to claim 2,
By sandwiching the band-shaped first electrode current collector between the band-shaped separators folded in half, a band-shaped laminate is formed by sandwiching the first electrode current collector between the separators. Forming a first folded body in which the body is folded in a mountain-like manner and a valley-like manner at the mountain-folding position and the valley-folding position of the first electrode current collector, and folded in a zigzag shape,
A step of forming a second folded body in which the belt-shaped second electrode current collector is folded in a mountain-folded state and a valley-folded state at the mountain-folded position and the valley-folded position, and folded in a zigzag shape;
The fold line portion of the first foldable body and the fold line portion of the second foldable body are orthogonal to each other, and a drawer tab of the first foldable body and a drawer tab of the second foldable body are provided. In a state of being arranged on the opposite side, a laminated body defined by the folded line portion of the first folded body and a second electrode current collector partitioned by the folded line portion of the second folded body And a step of assembling the first folded body and the second folded body so as to be alternately stacked.

  An electricity storage device according to claim 1 of the present invention uses a first electrode current collector in a strip shape and a second electrode current collector in a strip shape, and the first electrode current collector and the second electrode current collector. Are formed into a single-sheet structure, so that a plurality of sheet-shaped plurality of sheet-shaped electrode current collectors and sheet-shaped second electrode current collectors are stacked via a drawer tab as in a power storage device having a laminated structure. Since there is no need to connect the first electrode current collector and the second electrode current collector, the electrical resistance due to the connection of the drawer tab can be reduced, and the connection volume of the drawer tab becomes unnecessary. The volume efficiency with respect to the capacitance is good.

The electricity storage device according to claim 1 uses a first electrode current collector and a second electrode current collector in a band shape, and the first electrode current collector and the second electrode current collector. Since both have a single-sheet structure, it is only necessary to provide a connection terminal tab for connecting to an external device only at one end of the first electrode current collector and the second electrode current collector. The other end portions of the first electrode current collector and the second electrode current collector, which are not provided with the connection terminal tab, have resistance corresponding to the lengths of the first electrode current collector and the second electrode current collector. Will have a value.
Therefore, from the viewpoint of further reducing the electrical resistance, a structure in which a drawer tab is provided as in the power storage device according to claim 2 may be used. In the power storage device according to claim 2, the belt-shaped first electrode is provided. Since the extraction tab is provided for each predetermined interval in the longitudinal direction of the current collector and the extraction tab is provided for each predetermined width in the longitudinal direction of the strip-shaped second electrode current collector, the current input / output path is increased. Thus, electric resistance can be reduced.
The power storage device according to claim 2 also uses the first electrode current collector and the second electrode current collector in a band shape, and the first electrode current collector and the second electrode current collector are used. Since both have a single-sheet structure, all sheet-like first electrode collectors, such as a power storage device having a laminated structure of a sheet-like first electrode current collector and a sheet-like second electrode current collector, are obtained. Since there is no need to connect a drawer tab to the electric current and the sheet-like second electrode current collector, the volumetric efficiency with respect to the capacitance is good.

  1 shows a strip-shaped first electrode current collector 10 constituting the first power storage device according to the present invention, FIG. 2 shows a strip-shaped second electrode current collector 12, and FIG. 3 shows a strip-shaped separator 14. Is.

The first electrode current collector 10 is formed by forming a negative electrode active material layer on both surfaces of a conductive material having a low electrical resistance such as aluminum.
The negative electrode active material layer can be composed of a known material. When the electricity storage device is an electric double layer capacitor, for example, activated carbon is used as a main raw material, and a conductive additive such as carbon black and polytetrafluoroethylene are used. A binder can be added to the structure. In the case where the electricity storage device is a lithium ion battery, the negative electrode active material layer can be composed of a carbon material such as graphite as a main raw material.

In FIG. 1, 16 is a mountain fold line indicating the mountain fold position of the first electrode current collector 10, and 18 is a valley fold line indicating the valley fold position of the first electrode current collector 10. Mountain fold positions and valley fold positions are alternately provided for each predetermined width of the body 10 in the longitudinal direction.
As will be described later, the band-shaped first electrode current collector 10 is folded in a mountain-like manner and a valley-like manner in the state of the mountain fold line 16 and the valley fold line 18 together with the separator 14 in a state of being wrapped in the separator 14. It is folded (see FIG. 5).

The second electrode current collector 12 is formed by forming a positive electrode active material layer on both surfaces of a conductive material having a low electrical resistance such as aluminum.
The positive electrode active material layer can be composed of a known material. When the electricity storage device is an electric double layer capacitor, for example, activated carbon is used as a main raw material, and a conductive additive such as carbon black and polytetrafluoroethylene are used. A binder can be added to the structure. In the case where the electricity storage device is a lithium ion battery, the positive electrode active material layer can be composed of a lithium metal oxide such as lithium cobalt oxide as a main raw material.

In FIG. 2, 20 is a mountain fold line indicating the mountain fold position of the second electrode current collector 12, 22 is a valley fold line indicating the valley fold position of the second electrode current collector 12, and the second electrode current collector. Mountain fold positions and valley fold positions are alternately provided for each predetermined width in the longitudinal direction of the body 12.
The band-shaped second electrode current collector 12 is successively folded in a mountain-fold and valley-fold manner at the position of the mountain fold line 20 and the valley fold line 22 and folded in a zigzag manner (see FIG. 6).

The width D between the mountain fold line 20 (mountain fold position) and the valley fold line 22 (valley fold position) in the second electrode current collector 12 is the length L in the short direction of the first electrode current collector 10. Identical (D = L).
The length M in the short direction of the second electrode current collector 12 is the width N between the mountain fold line 16 (mountain fold position) and the valley fold line 18 (valley fold position) of the first electrode current collector 10. Are identical (M = N).

The separator 14 insulates the first electrode current collector 10 and the second electrode current collector 12 having different polarities. When the electric storage device is an electric double layer capacitor, for example, a cellulosic paper material When the electricity storage device is a lithium ion battery, it can be made of a porous material made of a resin such as polyethylene or polypropylene.
The length O in the short direction of the separator 14 is slightly larger than twice the length L in the short direction of the first electrode current collector 10 (O> 2L) and the length in the long direction. P is slightly larger than the length Q in the longitudinal direction of the first electrode current collector 10 (P> Q).

  In FIG. 3, reference numeral 24 denotes a valley fold line that indicates a valley fold position of the separator 14, and a position that bisects the separator 14 in the short direction is a valley fold position.

Hereinafter, an assembly process of the first electrode current collector 10, the second electrode current collector 12, and the separator 14 will be described.
First, the first electrode current collector 10 is sandwiched between the separators 14 by sandwiching the first electrode current collector 10 between the separators 14 that are valley-folded and folded into two at the position of the valley fold line 24. Is formed (see FIG. 4). As described above, the length 0 in the short direction of the separator 14 is slightly larger than twice the length L in the short direction of the first electrode current collector 10, and the length P in the long direction is Since the first electrode current collector 10 is slightly larger than the length Q in the longitudinal direction, the first electrode current collector 10 can be disposed so as to be completely wrapped by the separator 14. .

  Next, the laminated body 25 (FIG. 4) of the first electrode current collector 10 and the separator 14 is sequentially fold-folded and valley-shaped at the positions of the mountain fold line 16 and the valley fold line 18 of the first electrode current collector 10. A first folded body 26 is formed that is folded in a zigzag manner (FIG. 5). As a result, in the first folding body 26, the mountain fold line 16 and the valley fold line 18 are partitioned by turn-back line portions 28 formed by sequentially mountain-folding and valley-folding. A plurality of rectangular laminated bodies 25 each including the electrode current collector 10 are laminated in the vertical direction.

  Next, the second electrode current collector 12 is successively folded into a mountain and a valley at the position of the mountain fold line 20 and the valley fold line 22 to form a second folded body 32 folded in a zigzag manner (see FIG. 6). As a result, in the second foldable body 32, a plurality of rectangular second electrodes defined by folding line portions 34 formed by sequentially mountain-folding and valley-folding the mountain fold line 20 and the valley fold line 22 are formed. The current collector 12 is stacked in the vertical direction.

  Next, as shown in FIG. 7, the folding line portion 28 of the first folding body 26 and the folding line portion 34 of the second folding body 32 are orthogonal to each other as shown in FIG. 8 to FIG. 10. In addition, the rectangular laminated body 25 of the first folded body 26 and the rectangular second electrode current collector 12 of the second folded body 32 are assembled so as to be alternately stacked. .

  As a result, as shown in FIG. 11, the second electrode current collector 12 -the separator 14 -the first electrode current collector 10 -the separator 14 are repeatedly laminated in this order, and the second electrodes having different polarities. Both surfaces of the current collector 12 and both surfaces of the first electrode current collector 10 face each other through the separator 14.

  As described above, the width D between the mountain fold line 20 (mountain fold position) and the valley fold line 22 (valley fold position) in the second electrode current collector 12 is in the short direction of the first electrode current collector 10. The length L is the same as the length L (D = L), and the length M in the short direction is the mountain fold line 16 (mountain fold position) and valley fold line 18 (valley fold position) of the first electrode current collector 10. ) Between the fold line portion 28 of the first foldable body 26 and the fold line portion 34 of the second foldable body 32. In this state, when the rectangular laminated body 25 of the first folded body 26 and the rectangular second electrode current collector 12 of the second folded body 32 are alternately stacked, a rectangular shape is obtained. The entire surface of the first electrode current collector 10 and the entire surface of the rectangular second electrode current collector 12 can be arranged to face each other.

  In FIG. 11, 36 is a connection terminal tab connected to one end of the second electrode current collector 12, and 38 is a connection terminal tab connected to one end of the first electrode current collector 10.

  The first folded body 26 and the second folded body 32 having the structure shown in FIG. 11 are housed together with the electrolyte in an exterior case (not shown) and lead out the connection terminal tabs 36 and 38 to the outside of the exterior case. Thus, an electricity storage device is formed.

The first electricity storage device of the present invention is a band-shaped separator obtained by folding a band-shaped first electrode current collector 10 in which a mountain fold position and a valley fold position are alternately provided for each predetermined width in the longitudinal direction. The laminated body 25 sandwiched between the first folded body 26 which is folded in a mountain-like manner and a valley-like state in a zigzag manner, and the mountain-folding position and the valley-folding position are alternately arranged for each predetermined width in the longitudinal direction. The second electrode current collector 12 provided on the second folding body 32 has a second folded body 32 that is folded in a mountain-like manner and a valley-like manner, and folded in a zigzag manner. In the state where the part 28 and the fold line part 34 of the second foldable body 32 are orthogonal to each other, the rectangular laminate 25 partitioned by the fold line part 28 of the first foldable body 26, The rectangular second electrode current collectors 12 defined by the folding line portions 34 of the two folded bodies 32 are arranged so as to be alternately stacked.
As a result, the second electrode current collector 12 -the separator 14 -the first electrode current collector 10 -the separator 14 are repeatedly laminated in this order (see FIG. 11), and the second electrode current collectors having different polarities are obtained. Both surfaces of the body 12 and both surfaces of the first electrode current collector 10 can be opposed to each other with a separator 14 therebetween.

  In the first electricity storage device of the present invention, the first electrode current collector 10 and the second electrode current collector 10 are formed using the first electrode current collector 10 and the second electrode current collector 12 that are in the shape of a band. Since both the electrode current collectors 12 have a single-layer structure, the sheet-like first electrode current collector and the sheet-like second electrode current collector are stacked via an extraction tab as in a power storage device having a laminated structure. In addition, since it is not necessary to connect a plurality of sheet-shaped first electrode current collectors and second electrode current collectors, it is possible to reduce electrical resistance resulting from the connection of the drawer tabs and to connect the drawer tabs Since the volume is not required, the volumetric efficiency with respect to the capacitance is good.

  In the above, the case where the first folding body 26 and the second folding body 32 are assembled after the first folding body 26 and the second folding body 32 are individually formed has been described. From the state of the laminated body 25 (FIG. 4) of the first electrode current collector 10 and the separator 14 and the second electrode current collector 12 (FIG. 2), the first folded body 26 and the second folded body. The formation and assembly of the body 32 may be performed simultaneously.

Specifically, as shown in FIGS. 12 and 13, a band-shaped laminate 25 in which the first electrode current collector 10 is sandwiched between separators 14, and a band-shaped second electrode current collector 12 are provided. After arranging in the orthogonal direction, the laminated body 25 and the second electrode current collector 12 are alternately folded.
As a result, the first folding body 26 (see FIG. 5) and the second folding body 32 (see FIG. 6) are formed, and at the same time, the first folding body 26 is partitioned by the folding line portion 28. The rectangular laminated body 25 and the rectangular second electrode current collectors 12 defined by the fold line portions 34 of the second folded body 32 are alternately laminated to form the second electrode current collector. The assembly of the first folded body 26 and the second folded body 32 in a state where the body 12 -the separator 14 -the first electrode current collector 10 -the separator 14 are repeatedly laminated in this order is also completed (see FIG. 10).

  The first power storage device described with reference to FIGS. 1 to 13 is provided with the connection terminal tabs 36 and 38 only at one end of the second electrode current collector 12 and the first electrode current collector 10, In this case, the other ends of the second electrode current collector 12 and the first electrode current collector 10 where the connection terminal tabs 36 and 38 are not provided are the second electrode current collector 12 and the first electrode. The resistance value will be as much as the length of the current collector 10.

  Therefore, from the viewpoint of further reducing the electrical resistance, a structure may be provided in which a drawer tab is provided. FIG. 14 shows a strip-shaped first electrode current collector constituting a second power storage device according to the present invention provided with a drawer tab. 40 and 15 show a strip-shaped second electrode current collector 42, and FIG. 16 shows a strip-shaped separator 44.

  The first electrode current collector 40 is formed by forming a negative electrode active material layer on both surfaces of a conductive material having a low electrical resistance such as aluminum, and the first electrode current collector 40 as shown by a mountain fold line 46 and a valley fold line 48. For each predetermined width in the longitudinal direction of the electric body 40, a mountain fold position and a valley fold position are alternately provided.

The first electrode current collector 40 has a short length from the upper end (one end) of a rectangular region 40a defined by adjacent mountain fold lines 46 (mountain fold positions) and valley fold lines 48 (valley fold positions). A rectangular extraction tab 50 protruding in the direction is formed at predetermined intervals in the longitudinal direction of the first electrode current collector 40. In FIG. 14, a total of three drawer tabs 50 are formed in every other rectangular region 40a defined by adjacent mountain fold lines 46 (mountain fold positions) and valley fold lines 48 (valley fold positions). ing.
The extraction tab 50 is made of a conductive material constituting the first electrode current collector 40 in which the negative electrode active material layer is not formed.

  The width R of the extraction tab 50 is smaller than the width N between the mountain fold line 46 (mountain fold position) and the valley fold line 48 (valley fold position) of the first electrode current collector 40 in order to ensure insulation. Although formed (R <N), the first electrode current collector 40 can be formed to be as thick as the width N between the mountain fold line 46 and the valley fold line 48 (valley fold position).

As described later, the first electrode current collector 40 is folded in a zigzag shape by being successively folded in a mountain and valley at the position of the mountain fold line 46 and the valley fold line 48 together with the separator 44 in a state of being wrapped in the separator 44. (See FIG. 18).
In consideration of the fact that the first electrode current collector 40 is folded in a zigzag manner, the drawing tabs 50 are formed every other rectangular region 40a. In the case of a small number, it can be formed at odd intervals such as three intervals or five intervals.

  The second electrode current collector 42 is formed by forming a positive electrode active material layer on both surfaces of a conductive material having a low electrical resistance such as aluminum. As shown by a mountain fold line 52 and a valley fold line 54, the second electrode current collector 42 is formed. For each predetermined width in the longitudinal direction of the electric body 42, a mountain fold position and a valley fold position are alternately provided.

The second electrode current collector 42 includes a second electrode current collector in which a positive electrode active material layer is not formed for each predetermined width in the longitudinal direction of the second electrode current collector 42. A drawer tab 56 made of a conductive material constituting 42 is provided.
The extraction tabs 56 are formed at both ends of the second electrode current collector 42 and at the position of the central valley fold line 54 of the second electrode current collector 42 (valley fold position).
Further, the drawer tab 56 formed at the position of the valley fold line 54 (valley fold position) has a width twice that of the drawer tab 56 formed at both ends, and the valley fold line 54 (valley fold position). Is arranged in the center of the drawer tab 56.

  In addition, since the extraction tabs 56 formed other than both ends of the second electrode current collector 42 are pulled out in the same direction, the position of the valley fold line 54 (valley fold position) or the position of the mountain fold line 52 (mountain fold position) In addition, it is not necessary to provide at all the valley fold lines 54 positions (valley fold positions) or all the mountain fold lines 52 positions (mountain fold positions). Depending on the number, it may be provided every other odd number, such as every other or every third. Furthermore, if the required number is provided at the position of the valley fold line 54 (valley fold position) or the position of the mountain fold line 52 (mountain fold position), the extraction tabs 56 are not necessarily provided at both ends of the second electrode current collector 42. Also good.

The band-shaped second electrode current collector 42 is successively folded in a mountain and valley at the position of the mountain fold line 52 and the valley fold line 54, and is folded in a zigzag manner (see FIG. 19).
The lead tab 56 of the second electrode current collector 42 is composed of a conductive material in which the positive electrode active material layer is not formed for each predetermined width in the longitudinal direction of the second electrode current collector 42. As shown in FIG. 19, a drawing tab 56 having the same thickness as the length M in the short direction of the second electrode current collector 42 can be provided.

The width D between the mountain fold line 52 (mountain fold position) and the valley fold line 54 (valley fold position) in the second electrode current collector 42 is the length L in the short direction of the first electrode current collector 40. Identical (D = L).
The length M in the short direction of the second electrode current collector 42 is the width N between the mountain fold line 46 (mountain fold position) and the valley fold line 48 (valley fold position) of the first electrode current collector 40. Are identical (M = N).

  The separator 44 insulates the first electrode current collector 40 and the second electrode current collector 42. Like the separator 14, the length O in the short direction of the separator 44 is the first length O. The electrode collector 40 is slightly larger than twice the length L in the short direction (O> 2L), and the length P in the long direction is the length of the first electrode current collector 40. The length is slightly larger than the length Q in the scale direction (P> Q).

In FIG. 16, reference numeral 58 denotes a valley fold line indicating a valley fold position of the separator 44, and a position at which the separator 44 is equally divided in the short direction is a valley fold position.
In addition, a pair of convex pieces 60, 60 projecting outward are formed at positions opposed to the upper end (one end) and the lower end (other end) of the separator 44, and the pair of convex pieces 60, 60 are formed. Are provided at three locations in the longitudinal direction of the separator 44 corresponding to the number and position of the extraction tabs 50 of the first electrode current collector 40.
The width S of the convex piece 60 is larger than the width R of the extraction tab 50 in order to ensure insulation of the extraction tab 50 of the first electrode current collector 40 (S> R). The protruding length T of the convex piece 60 is smaller than the protruding length U of the drawer tab 50 (T <U).

Hereinafter, an assembly process of the first electrode current collector 40, the second electrode current collector 42, and the separator 44 will be described.
First, the first electrode current collector 40 is sandwiched between the separators 44 by sandwiching the first electrode current collector 40 between the separators 44 that are folded in two at the position of the valley fold line 58. A band-shaped laminate 62 is formed (see FIG. 17).
As described above, the length 0 in the short direction of the separator 44 is slightly larger than twice the length L in the short direction of the first electrode current collector 40, and the length P in the long direction is Since the first electrode current collector 40 is slightly larger than the length Q in the longitudinal direction, the first electrode current collector 40 can be disposed so as to be completely wrapped by the separator 44. . In addition, each extraction tab 50 of the first electrode current collector 40 is sandwiched between the convex pieces 60, 60 of the separator 44 except for the tip portion.

Next, the stacked body 62 (FIG. 17) of the first electrode current collector 40 and the separator 44 is sequentially folded and valley-folded at the positions of the mountain fold line 46 and the valley fold line 48 of the first electrode current collector 40. A first folded body 64 is formed that is folded in a zigzag manner (FIG. 18).
As a result, the first folded body 64 is partitioned by the folded line portion 66 formed by sequentially mountain-folding and valley-folding the mountain fold line 46 and the valley fold line 48, and the first fold body 64 is separated between the upper and lower separators 44. A plurality of rectangular laminated bodies 62 each including the electrode current collector 40 are laminated in the vertical direction. In addition, three extraction tabs 50 protruding from the first electrode current collector 40 are stacked in the vertical direction.

  Next, the second electrode current collector 42 is successively folded into a mountain and a valley at the position of the mountain fold line 52 and the valley fold line 54 to form a second folded body 68 that is folded in a zigzag manner (see FIG. 19). As a result, in the second foldable body 32, a plurality of rectangular second electrodes defined by folding line portions 70 formed by sequentially mountain-folding and valley-folding the mountain fold line 52 and the valley fold line 54. The current collector 42 is stacked in the vertical direction. In addition, drawer tabs 56 formed at both ends of the second electrode current collector 42 and the position of the central valley fold line 54 (valley fold position) are stacked in the vertical direction.

  Next, as shown in FIG. 20, the folding line portion 66 of the first folding body 64 and the folding line portion 70 of the second folding body 68 are orthogonal to each other, and the first folding body 64 is drawn out. In a state where the tab 50 and the drawer tab 56 of the second folding body 68 are arranged on the opposite side, as shown in FIGS. 21 to 24, a rectangular laminate 62 of the first folding body 64 and The rectangular second electrode current collectors 42 of the second folded body 68 are assembled so as to be alternately stacked.

As a result, the second electrode current collector 42, the separator 44, the first electrode current collector 40, and the separator 44 are repeatedly laminated in this order, and both surfaces of the second electrode current collector 42 having different polarities The both surfaces of the first electrode current collector 40 face each other with the separator 44 interposed therebetween.
Further, the drawing tab 56 of the second electrode current collector 42 and the drawing tab 50 of the first electrode current collector 40 are drawn in opposite directions.

  Thereafter, as shown in FIGS. 25 and 26, after connecting the three extraction tabs 56 of the second electrode current collector 42, the connection terminal tab 72 is connected, and the first electrode current collector 403 After connecting the drawer tab 50, the connection terminal tab 74 is connected.

In the second power storage device of the present invention, a mountain fold position and a valley fold position are alternately provided for each predetermined width in the longitudinal direction, and a region 40a defined by adjacent mountain fold positions and valley fold positions is provided. A laminated body 62 in which a strip-shaped first electrode current collector 40 in which drawer tabs 50 projecting from one end in the short direction are provided at predetermined intervals in the long direction is sandwiched between strip-shaped separators 44 folded in half. Are sequentially folded in a mountain fold and a valley and folded into a zigzag fold, and a mountain fold position and a valley fold position are alternately provided for each predetermined width in the longitudinal direction. The strip-shaped second electrode current collector 42 in which the extraction tabs 56 formed at either one of the position and the valley folding position are provided for each predetermined width in the longitudinal direction is sequentially folded in a mountain and a valley. A second folded body 68 folded in a zigzag manner is provided, and the first folded body 64 is folded back. The section 66 and the folding line section 70 of the second folding body 68 are orthogonal to each other, and the drawing tab 50 of the first folding body 64 and the drawing tab 56 of the second folding body 68 are arranged on the opposite side. In this state, the rectangular laminate 62 defined by the fold line portion 66 of the first foldable body 64 and the rectangular shape defined by the fold line portion 70 of the second foldable body 68 are provided. The second electrode current collectors 42 are alternately stacked.
As a result, the second electrode current collector 42, the separator 44, the first electrode current collector 40, and the separator 44 are repeatedly laminated in this order (see FIGS. 23 and 24). Both surfaces of the electrode current collector 42 and both surfaces of the first electrode current collector 40 can be opposed to each other via the separator 44, and the drawer tab 50 of the first electrode current collector 40 and the second electrode current collector 40 can be opposed to each other. The drawer tab 56 of the electrical body 42 can be pulled out in the opposite direction.

In the second power storage device of the present invention, the pull-out tabs 50 are provided at predetermined intervals in the longitudinal direction of the strip-shaped first electrode current collector 40 and the strip-shaped second electrode current collector 42 is provided. Since the drawing tabs 56 are provided for each predetermined width in the longitudinal direction, the current input / output paths are increased, and the electrical resistance can be reduced.
The first electrode current collector 40 and the second electrode current collector 42 are both formed into a single-layer structure using the first electrode current collector 40 and the second electrode current collector 42 which are in the form of a band. As a result, the sheet-like first electrode current collector and the sheet-like second electrode current collector and all the sheet-like first electrode current collectors and the sheet-like electric current collectors, such as the power storage device having the laminated structure of the sheet-like second electrode current collector, Since there is no need to connect the extraction tab to the second electrode current collector, the volumetric efficiency with respect to the capacitance is good.

  In the above description, the first electrode current collectors 10 and 40 have a negative polarity, and the second electrode current collectors 12 and 42 have a positive polarity. Of course, 40 may be positive and the second electrode current collectors 12 and 42 may be negative.

It is a top view which shows the 1st electrode electrical power collector which comprises the 1st electrical storage device of this invention. It is a top view which shows the 2nd electrode electrical power collector which comprises the 1st electrical storage device of this invention. It is a top view which shows the separator which comprises the 1st electrical storage device of this invention. It is a perspective view which shows the laminated body formed by inserting | pinching the 1st electrode electrical power collector between separators. It is a perspective view which shows a 1st folding body. It is a perspective view which shows a 2nd folding body. It is explanatory drawing which shows the assembly method of a 1st folding body and a 2nd folding body. It is explanatory drawing which shows the assembly method of a 1st folding body and a 2nd folding body. It is explanatory drawing which shows the assembly method of a 1st folding body and a 2nd folding body. It is explanatory drawing which shows the assembly method of a 1st folding body and a 2nd folding body. It is a perspective view which shows the state which assembled | attached the 1st folding body and the 2nd folding body. It is explanatory drawing which shows the other assembly method of a 1st folding body and a 2nd folding body. It is explanatory drawing which shows the other assembly method of a 1st folding body and a 2nd folding body. It is a top view which shows the 1st electrode electrical power collector which comprises the 2nd electrical storage device of this invention. It is a top view which shows the 2nd electrode electrical power collector which comprises the 2nd electrical storage device of this invention. It is a top view which shows the separator which comprises the 2nd electrical storage device of this invention. It is a perspective view which shows the laminated body formed by inserting | pinching the 1st electrode electrical power collector between separators. It is a perspective view which shows a 1st folding body. It is a perspective view which shows a 2nd folding body. It is explanatory drawing which shows the assembly method of a 1st folding body and a 2nd folding body. It is explanatory drawing which shows the assembly method of a 1st folding body and a 2nd folding body. It is explanatory drawing which shows the assembly method of a 1st folding body and a 2nd folding body. It is explanatory drawing which shows the assembly method of a 1st folding body and a 2nd folding body. It is a perspective view which shows the state which assembled | attached the 1st folding body and the 2nd folding body. It is a top view which shows typically the state which connected the connection terminal tab to the 1st folding body and the 2nd folding body. It is a front view which shows typically the state which connected the connection terminal tab to the 1st folding body and the 2nd folding body.

10 First electrode current collector
12 Second electrode current collector
14 Separator
16 Mountain fold line of the first electrode current collector
18 Valley folded line of the first electrode current collector
20 Mountain fold line of the second electrode current collector
22 Valley fold line of second electrode current collector
24 Separator valley fold line
25 Laminate
26 First folding body
28 Folding line part of the first folding body
32 Second folding body
34 Folding line part of the second folding body
36 Connection terminal tab of the second electrode current collector
38 Connection terminal tab D of first electrode current collector Width L between mountain fold line and valley fold line of second electrode current collector Length M of first electrode current collector in short direction Second electrode current collector The length N in the short direction of the body The width between the mountain fold line and the valley fold line of the first electrode current collector O The length P in the short direction of the separator P The length Q in the long direction of the separator The length of the first electrode current collector Longitudinal length
40 First electrode current collector
40a Area defined by a mountain fold position and a valley fold position of the first electrode current collector
42 Second electrode current collector
44 Separator
46 Mountain fold line of the first electrode current collector
48 Valley folding line of the first electrode current collector
50 Lead tab of the first electrode current collector
52 Mountain fold line of the second electrode current collector
54 Valley fold line of second electrode current collector
56 Drawer tab of second electrode current collector
58 Separator Valley Fold Line
60 Separator convex pieces
62 Laminate
64 First fold
66 Folding line part of the first folding body
68 Second folding body
70 Folding line part of the second folding body
72 Connection terminal tab of the second electrode current collector
74 First electrode current collector connection terminal tab R First electrode current collector lead tab width S Separator convex piece width T Separator convex piece protrusion length U First electrode current collector lead Tab protrusion length

Claims (5)

A stack formed by sandwiching a band-shaped first electrode current collector in which a mountain fold position and a valley fold position are alternately provided for each predetermined width in the longitudinal direction between two band-shaped separators is sequentially stacked. A first folded body folded in a zigzag shape by folding and valley folding;
A second fold obtained by sequentially folding a mountain-like and valley-folded electrode current collector, in which a mountain fold position and a valley fold position are provided alternately for each predetermined width in the longitudinal direction, and then folding into a zigzag fold. Have a tatami body,
In the state where the fold line portion of the first foldable body and the fold line portion of the second foldable body are orthogonal to each other, the laminated body defined by the fold line portion of the first foldable body, and A power storage device, wherein the second electrode current collector partitioned by a fold line portion of the second folding body is alternately stacked. A mountain fold position and a valley fold position are alternately provided for each predetermined width in the long direction, and a pull-out tab that protrudes in the short direction from one end of a region defined by adjacent mountain fold positions and valley fold positions is long. A laminated body formed by sandwiching a band-shaped first electrode current collector provided at predetermined intervals in the scale direction between two band-shaped separators, and then folding them in a mountain-fold and valley-fold in a zigzag manner. The first fold and
Mountain fold positions and valley fold positions are alternately provided for each predetermined width in the long direction, and the drawer tabs formed at either the mountain fold position or the valley fold position are provided for each predetermined width in the long direction. A second folded body in which the band-shaped second electrode current collector provided in the plate is folded in a mountain and valley and folded in a zigzag manner.
The folding line portion of the first folding body and the folding line portion of the second folding body are orthogonal to each other, and the drawer tab of the first folding body and the drawer tab of the second folding body are opposite to each other. A laminated body defined by the folded line portion of the first folded body, and a second electrode current collector partitioned by the folded line portion of the second folded body, An electricity storage device characterized by being arranged so as to be stacked alternately. It is a manufacturing method of the electrical storage device according to claim 1,
By sandwiching the band-shaped first electrode current collector between the band-shaped separators folded in half, a band-shaped laminate is formed by sandwiching the first electrode current collector between the separators. Forming a first folded body in which the body is folded in a mountain-like manner and a valley-like manner at the mountain-folding position and the valley-folding position of the first electrode current collector, and folded in a zigzag shape,
A step of forming a second folded body in which the belt-shaped second electrode current collector is folded in a mountain-folded state and a valley-folded state at the mountain-folded position and the valley-folded position, and folded in a zigzag shape;
In the state where the fold line portion of the first foldable body and the fold line portion of the second foldable body are orthogonal to each other, the laminated body defined by the fold line portion of the first foldable body, and A step of assembling the first folded body and the second folded body so that the second electrode current collectors partitioned by the fold line portions of the second folded body are alternately stacked. A method for manufacturing an electricity storage device. It is a manufacturing method of the electrical storage device according to claim 1,
A step of forming a band-shaped laminate in which the first electrode current collector is sandwiched between the separators by sandwiching the band-shaped first electrode current collector between the band-shaped separators folded in two;
The strip-shaped laminate and the strip-shaped second electrode current collector are arranged in an orthogonal direction, and the laminate and the second electrode current collector are alternately folded, whereby the first fold is formed. At the same time as forming the tatami body and the second foldable body, the laminated body defined by the fold line portion of the first foldable body and the second electrode defined by the fold line portion of the second foldable body The manufacturing method of the electrical storage device characterized by having the process of laminating | stacking alternately a collector. It is a manufacturing method of the electrical storage device according to claim 2,
By sandwiching the band-shaped first electrode current collector between the band-shaped separators folded in half, a band-shaped laminate is formed by sandwiching the first electrode current collector between the separators. Forming a first folded body in which the body is folded in a mountain-like manner and a valley-like manner at the mountain-folding position and the valley-folding position of the first electrode current collector, and folded in a zigzag shape,
A step of forming a second folded body in which the belt-shaped second electrode current collector is folded in a mountain-folded state and a valley-folded state at the mountain-folded position and the valley-folded position, and folded in a zigzag shape;
The fold line portion of the first foldable body and the fold line portion of the second foldable body are orthogonal to each other, and a drawer tab of the first foldable body and a drawer tab of the second foldable body are provided. In a state of being arranged on the opposite side, a laminated body defined by the folded line portion of the first folded body and a second electrode current collector partitioned by the folded line portion of the second folded body A method of manufacturing an electricity storage device, comprising: assembling the first folded body and the second folded body so that and are alternately stacked.

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