JP5488149B2 - Electric storage device, device module, and manufacturing method - Google Patents

Description

  The present invention relates to an electricity storage device configured by electrically connecting a plurality of electricity storage elements to each other in series, a device module, and a manufacturing method.

  2. Description of the Related Art In recent years, progress in downsizing and weight reduction of electronic devices has been remarkable, and accordingly, demands for downsizing and weight reduction of batteries used as power sources for driving the electronic devices are further increased. In order to satisfy such demands for reduction in size and weight, power storage devices such as lithium ion secondary batteries have been developed.

  In addition, an electric double layer capacitor is known as an electric storage device having characteristics such as high output density and good cycle performance. Further, lithium ion capacitors that combine the storage principles of lithium ion secondary batteries and electric double layer capacitors are attracting attention as power storage devices for applications that require high energy density characteristics and high output characteristics. And electrical storage devices, such as an electric double layer capacitor and a lithium ion capacitor, can be used not only as a so-called power application but also as a circuit capacitor.

  Currently, several products are supplied as circuit capacitors to which an electric double layer capacitor is applied. All of them employ a structure in which a separator is disposed between a pair of electrodes and wound. In such a so-called electrode foil wound type electric double layer capacitor, the capacitance is as large as several F to several thousand F, but the rated voltage is as low as 2 to 3V. Therefore, in the electricity storage device as described above, when a higher operating voltage is required, it is necessary to electrically connect a plurality of electricity storage elements in series. As a technique for electrically connecting a plurality of power storage elements in series, for example, a technique is known in which a current collector in a double portion when stacked is stacked in a single layer (for example, Patent Documents). 1). In addition, there is also known one that is connected in series using a conductive plate that commonly carries polarizable electrodes of adjacent power storage elements (see, for example, Patent Document 2).

JP-A-54-97770 JP 55-162218 A

  However, in the technique described in Patent Document 1, it is necessary to sequentially stack individual power storage elements one by one, which makes the manufacturing process cumbersome and bulky because a large number of power storage elements are stacked in series. There was a problem of becoming. In addition, the technique described in Patent Document 2 requires a number of conductive plates corresponding to an increase in the number of power storage elements connected in series, and has a problem that the manufacturing process becomes troublesome.

  The present invention has been made in view of such problems, and in the case of connecting a plurality of power storage elements in series, the power storage elements can be easily stacked, and the power storage device can be planarized. It aims at providing the technology to do.

The invention according to claim 1, which has been made to achieve the above object, includes a plurality of power storage elements each including a first electrode and a second electrode, which are arranged to face each other via a separator and have different polarities. , An electrical storage device configured by electrically connecting a plurality of electrical storage elements in series with each other, one of any two adjacent electrical storage elements as a first electrical storage element and the other as a second electrical storage element, By providing a metal connection member that electrically connects the first electrode of the first power storage element and the second electrode of the second power storage element, the plurality of power storage elements are electrically connected in series, and the power storage Among the connection members connected to each of the plurality of power storage elements included in the device, at least one connection member includes the first electrode of the first power storage element to which the connection member is connected and the second power storage to which the connection member is connected. Elemental Et bent between 2 electrode, in the state where the connecting member is not bent, the plurality of power storage devices, a two-dimensional matrix along a direction perpendicular to the direction in which the first electrode and the second electrode are opposed In a state where the connecting members are arranged and not bent, a direction in which a plurality of connecting members arranged on one side across the separator are aligned and a plurality arranged on the other side across the separator The direction in which the connecting members are aligned is orthogonal . Note that an energy storage element refers to an element constituting a secondary battery or an element constituting a capacitor that can also be used as a circuit capacitor.

  According to the electricity storage device configured as described above, the first energy storage device and the second energy storage device that are electrically connected in series via the connection member can be stacked by bending the connection member. it can. That is, the power storage device of the present invention can stack power storage elements connected in series simply by bending. Therefore, the power storage device can store power more electrically than the case of electrical connection in series by sequentially stacking the power storage elements one by one. The operation of stacking elements can be easily performed.

The electric storage device according to claim 1 can be a flat and compact electric storage device even when several hundred electric storage elements are connected in series. Such an electricity storage device is suitable for applications in which the rated voltage reaches several hundred volts, more specifically 100 to 500 volts.

Further, in the electricity storage device according to claim 1 , as described in claim 2 , the separator is impregnated with a material different from the separator, so that at least a part of the separator is made of a material different for each electricity storage element. It is good to be comprised so that it may isolate | separate on both sides.

  According to the power storage device configured as described above, it is not necessary to provide a separate separator for each power storage element, and it is only necessary to provide one separator for a plurality of power storage elements, thus simplifying the manufacturing process of the power storage device. be able to.

Moreover, in the electrical storage device of any one of Claims 1-2 , it is good to provide the sheet | seat member in which the connection member was formed on the surface like Claim 3 .
According to the electricity storage device configured as described above, the step of forming the pattern of the connection member on the sheet member by a method combining printing and etching can be employed in the method for manufacturing the electricity storage device. Accordingly, when increasing the number of power storage elements constituting the power storage device, the number of connection members corresponding to the increase in the number of power storage elements is prepared, and the connection member is connected to the power storage elements one by one. In addition, since a necessary number of connecting members can be collectively formed on a sheet member by a method combining printing and etching, and an electrode can be further formed thereon, the manufacturing process is prevented from becoming complicated. be able to.

The invention according to claim 4 is a device module configured by storing a plurality of power storage elements in a container, and the container according to any one of claims 1 to 3 . A power storage device is accommodated.

According to the device module configured as described above, the same effects as those of the electricity storage device according to any one of claims 1 to 3 can be obtained.
5. The device module according to claim 4 , wherein an external positive electrode terminal and an external negative electrode connected to the positive electrode terminal and the negative electrode terminal of the electricity storage device accommodated in the container and drawn out of the container are disposed outside the container. When the terminal is provided, a support member for supporting the container may be provided as described in claim 5 .

  According to the device module configured as described above, when the external positive electrode terminal and the external negative electrode terminal also serve to support the device module, the load of the device module applied to the external positive electrode terminal and the external negative electrode terminal is caused by the support member. This can be reduced, and damage to the external positive terminal and the external negative terminal can be suppressed.

Moreover, in the manufacturing method of the electrical storage device of any one of Claims 1-3 , the pattern of a connection member is formed on a sheet | seat member by the method of combining printing and etching as described in Claim 6. It is good to provide the process of forming.

According to the method for manufacturing an electricity storage device configured as described above, the same effect as the electricity storage device according to claim 3 is obtained.

It is a perspective view which shows the partial structure of the electrical storage device 1 of 1st Embodiment. It is a figure which shows the AA cross-section part of FIG. 1, and a BB cross-section part. It is a perspective view which shows arrangement | positioning of the capacitor element 2 for demonstrating electrical connection. It is a top view of the electrical storage device 1 for demonstrating electrical connection. 2 is a perspective view showing a structure of an electricity storage device module 100. FIG. It is the side view and top view which show the structure of the electrical storage device 1 of 2nd Embodiment. It is a top view which shows the structure of the separator of another embodiment. It is a perspective view which shows the structure of the electrical storage device module 100 of another embodiment, and a figure which shows an AA cross section.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a partial structure of the electricity storage device 1 of the present embodiment.

As shown in FIG. 1, the electricity storage device 1 includes a plurality of capacitor elements 2 and a support film 3 that supports the capacitor elements 2.
The capacitor element 2 is an electric double layer capacitor, and is configured by arranging a pair of polarizable electrodes 11 (hereinafter also simply referred to as electrodes 11) composed of a positive electrode and a negative electrode so as to face each other via a separator 12. . Further, the capacitor element 2 includes a current collector 13 disposed so as to face the polarizable electrode 11 on the side opposite to the separator 12 with the polarizable electrode 11 interposed therebetween.

  In addition, the upper electrode 11 and the current collector 13 in FIG. 1 with the separator 12 interposed therebetween are the electrode 11a and the current collector 13a, respectively, and the lower electrode 11 and the current collector 13 in FIG. 11b and current collector 13b.

  The polarizable electrode 11 is usually prepared by kneading a binder and a conductive additive in an active material. As the active material, for example, a carbon material such as activated carbon powder is used. As the conductive auxiliary, for example, acetylene black, graphite, metal powder or the like is used. As the binder, for example, polytetrafluoroethylene (PTFE) or polyfluorinated powder. Fluorine-containing resins such as vinylidene, rubber-based binders such as SBR, thermoplastic resins such as polypropylene and polyethylene are used.

As the separator 12, for example, a nonwoven fabric made of glass fiber, cellulose fiber, polypropylene fiber or the like is used. The separator is impregnated with the electrolytic solution. As the electrolytic solution, for example, an aprotic organic solvent electrolyte solution of tetraethylammonium salt or imidazolium salt is used. Examples of the anion constituting the ammonium salt or imidazolium salt include PF ₆ ⁻ , BF ₄ ⁻ , AsF ₆ ⁻ , SbF ₆ ⁻ , N (CF ₃ SO ₃ ) ₂ ⁻ , and C (CF ₃ SO ₃ ) ₃ ^−. CF ₃ (SO ₃ ) ⁻ , F ⁻ , ClO ₄ ⁻ , AlF ₄ ⁻ , AlCl ₄ ⁻ , TaF ₆ ⁻ , NbF ₆ ⁻ , SiF ₆ ⁻ , CN ⁻ , F (HF) _n ^{− and the} like. Examples of the aprotic organic solvent include propylene carbonate, ethylene carbonate, butylene carbonate, vinylene carbonate, sulfolane, methyl sulfolane, acetonitrile, fluorinated γ-butyrolactone, γ-butyrolactone, fluorinated propylene carbonate, dimethyl carbonate, and ethylmethyl. Examples include carbonate and diethyl carbonate.

As a material of the current collector 13, for example, aluminum, copper, stainless steel or the like is used.
The support film 3 is not particularly limited as long as it has insulating properties, flexibility, and heat resistance. For example, polyester (eg, polyethylene terephthalate (PET), polybutylene terephthalate), polyimide, polycarbonate Synthetic resin films such as polyethylene and polypropylene are used. In the present invention, polyimide is preferably used from the viewpoint of heat resistance.

In the present embodiment, the thicknesses of the polarizable electrode 11, the separator 12, the current collector 13, and the support film 3 are 80 μm, 20 μm, 30 μm, and 20 μm, respectively.
2A is a diagram showing the AA cross section of FIG. 1, and FIG. 2B is a diagram showing the BB cross section of FIG. FIG. 3 is a perspective view showing the arrangement of the capacitor element 2 for explaining the electrical connection of the capacitor element 2.

  As shown in FIG. 2 (a), on the support film 3a, a rectangular current collector 13a on which two substantially square electrodes 11a can be arranged has a short direction in the longitudinal direction of the support film 3a. A plurality are arranged in alignment along D1. Furthermore, two substantially square electrodes 11a are arranged on the current collector 13a in alignment along the short direction D2 of the support film 3a. In the present embodiment, the length of one side of the electrode 11 is about 2 cm.

  Further, as shown in FIG. 2B, on the support film 3b, a rectangular current collector 13b on which two substantially square electrodes 11b can be arranged along the longitudinal direction supports the longitudinal direction. A plurality of films 3b are arranged in alignment along the longitudinal direction D1 of the film 3b. The current collector row 13R configured by arranging the plurality of current collectors 13b along the longitudinal direction D1 is provided in two rows along the short direction D2 of the support film 3b. The current collector row 13R is alternately arranged in the longitudinal direction D1 of the support film 3b. Further, two substantially square electrodes 11b are arranged on the current collector 13b in alignment along the longitudinal direction D1 of the support film 3b.

  Here, as shown to Fig.2 (a), the collector 13a arrange | positioned on the support film 3a is made into collector 13a [1], 13a [2 in order from the left side of the longitudinal direction D1 of the support film 3a. ], 13a [3], 13a [4],.

  Moreover, let the two electrodes 11a arrange | positioned on the electrical power collector 13a [N] be the electrodes 11a [NA] and 11a [NB] from the upper side of the transversal direction D2 of the support film 3a ( N is an integer).

  In addition, the current collector 13b disposed so as to straddle the current collector 13a [N] and the current collector 13a [N + 1] is referred to as a current collector 13b [N] (N is an integer). However, the current collector 13b facing only the current collector 13a [1] is the current collector 13b [0]. Furthermore, the electrodes 11b arranged to face the electrodes 11a [NA] and 11a [NB] are respectively referred to as electrodes 11b [NA] and 11b [NB] (N is an integer). .

  In the electricity storage device 1, for example, the electrode 11a [1-A] and the electrode 11b [1-A] are opposed to each other (see <1> in FIGS. 2 and 3), and the electrode 11a [1- A current collector 13a [1] and a current collector 13b [0] are connected to A] and the electrode 11b [1-A], respectively. That is, the electrode 11 a [1 -A], the electrode 11 b [1 -A], the current collector 13 a [1], the current collector 13 b [0], and the separator 12 constitute one capacitor element 2. Hereinafter, the capacitor element 2 is also referred to as a capacitor element <1>.

  In addition, the electrode 11a [1-B] and the electrode 11b [1-B] are opposed to each other (see <2> in FIGS. 2 and 3), and further, the electrode 11a [1-B] and the electrode 11b A current collector 13a [1] and a current collector 13b [1] are connected to [1-B], respectively. That is, the electrode 11 a [1 -B], the electrode 11 b [1 -B], the current collector 13 a [1], the current collector 13 b [1], and the separator 12 constitute one capacitor element 2. Hereinafter, the capacitor element 2 is also referred to as a capacitor element <2>.

Therefore, the electrode 11a [1-A] of the capacitor element <1> and the electrode 11a [1-B] of the capacitor element <2> are electrically connected via the current collector 13a [1]. .
Further, the electrode 11a [2-B] and the electrode 11b [2-B] face each other (see <3> in FIGS. 2 and 3), and the electrode 11a [2-B] and the electrode 11b The current collector 13a [2] and the current collector 13b [1] are connected to [2-B], respectively. That is, the electrode 11 a [2 -B], the electrode 11 b [2 -B], the current collector 13 a [2], the current collector 13 b [1], and the separator 12 constitute one capacitor element 2. Hereinafter, the capacitor element 2 is also referred to as a capacitor element <3>.

Therefore, the electrode 11b [1-B] of the capacitor element <2> and the electrode 11b [2-B] of the capacitor element <3> are electrically connected via the current collector 13b [1]. .
Furthermore, the electrode 11a [2-A] and the electrode 11b [2-A] are opposed to each other (see <4> in FIGS. 2 and 3), and further, the electrode 11a [2-A] and the electrode 11b The current collector 13a [2] and the current collector 13b [2] are connected to [2-A], respectively. In other words, the electrode 11 a [2 -A], the electrode 11 b [2 -A], the current collector 13 a [2], the current collector 13 b [2], and the separator 12 constitute one capacitor element 2. Hereinafter, the capacitor element 2 is also referred to as a capacitor element <4>.

Therefore, the electrode 11a [2-B] of the capacitor element <3> and the electrode 11a [2-A] of the capacitor element <4> are electrically connected via the current collector 13a [2]. .
From the above, as shown in FIG. 3, the capacitor elements <1>, <2>, <3>, <4> are electrically connected in series (see line L1 in FIG. 3).

  The capacitor element 2 connected in series with the capacitor element <4> is referred to as a capacitor element <5>, the capacitor element 2 connected in series with the capacitor element <5> is referred to as a capacitor element <6>, and the capacitor element The capacitor element 2 connected in series with <6> is defined as capacitor element <7>, and the capacitor element 2 connected in series with capacitor element <7> is defined as capacitor element <8> (FIGS. 2 and 3). <5>, <6>, <7>, <8> described in the above), a block including capacitor elements <1>, <2>, <3>, <4>, and capacitor elements <5>, The block is made up of the same structure as the block consisting of <6>, <7>, and <8>. That is, the electricity storage device 1 includes capacitor elements <1>, <2>, <3>, <4> as one block, and a plurality of these blocks arranged in alignment along the longitudinal direction D1 of the support film 3. It corresponds to. Thereby, many capacitor elements 2 are connected in series.

  FIG. 4 is a plan view of the electricity storage device 1 for explaining the electrical connection of the capacitor element 2. As shown in FIG. 4, a plurality of capacitor elements 2 are arranged in alignment along the longitudinal direction D <b> 1 of the support film 3, and two rows are provided along the short direction D <b> 2 of the support film 3. Then, starting from the capacitor element 2 arranged on the lower left side of the support film 3, the capacitor element 2 adjacent in the longitudinal direction D1 of the support film 3 and the capacitor element 2 adjacent in the short direction D2 Alternately connected in series (see line L2 in FIG. 4).

The electricity storage device 1 configured as described above is manufactured by, for example, the steps shown below.
First, a current collector pattern is formed on the surfaces of the support films 3a and 3b. The method of forming the current collector pattern is not particularly limited. For example, a method of directly forming the current collector pattern on the surface of the support film by a printing method such as flexographic printing or screen printing or a sputtering method. Another method is a combination of printing and etching. In a method combining printing and etching, first, a resist pattern is formed on a laminated film of a support film and a current collector material (for example, an aluminum foil). This resist pattern is formed only on a predetermined portion corresponding to the current collector 13. Thereafter, the current collector material is etched to remove the material of the current collector 13 in a region other than the region where the resist pattern is formed. Etching may be wet etching or dry etching. Thereby, a current collector pattern is formed on the support films 3a and 3b.

  Next, the electrodes 11a and 11b are formed on the support films 3a and 3b on which the current collector pattern is formed, using an electrode composition containing an active material, a binder, and a conductive additive, respectively. As a method for forming the electrode, a known method can be used. For example, a printing method such as flexographic printing and screen printing, a coating method such as an intermittent coating method, and an electrode composition formed into a sheet shape are collected. A method of laminating on the electric current pattern, or a method of forming a sheet on the current collecting pattern and roll pressing can be used.

  Then, the surfaces of the support films 3a and 3b on which the current collector 13 and the electrode 11 are formed face each other with the separator 12 interposed therebetween, and the support films 3a and 3b are pressure-bonded from the outer surfaces. In this way, the electricity storage device 1 is manufactured.

FIG. 5 is a perspective view showing the structure of the electricity storage device module 100.
As shown in FIG. 2, a belt-like support film 3 supporting the capacitor element 2 is bent along a longitudinal direction D1 with a predetermined bending length K1 (in this embodiment, five capacitor elements 2 are arranged along the longitudinal direction D1. Are folded so that the fold line is perpendicular to the longitudinal direction D1 (see the fold line C1 in FIG. 2), and as shown in FIG. To form. In addition, as shown by the fold line C1 of FIG. 2, the location where the support film 3 is bent is set to be a location where the electrode 11 is not formed.

  And as shown in FIG. 5, the electrical storage device 1 formed in the shape of a bellows is accommodated in the rectangular parallelepiped container 110 with electrolyte solution (refer arrow Y1 of FIG. 5). In this way, the electricity storage device module 100 is manufactured.

  The container 110 is made of a material in which a metal such as aluminum is covered with a resin, and includes a container body 111 and a container lid 112. The container body 111 includes a housing portion 113 capable of housing the bellows-shaped power storage device 1, and the housing portion 113 has an opening 114 for inserting the power storage device 1 into the housing portion 113. The container lid 112 is a plate-shaped member that is formed to have a size capable of closing the opening 114, and is attached to a position where the opening 114 is closed after the bellows-like power storage device 1 and the electrolytic solution are stored.

The electricity storage device 1 is provided with a positive electrode terminal 31 and a negative electrode terminal 32 at one end and the other end of a capacitor element array formed by connecting capacitor elements 2 in series, respectively.
The container body 111 is connected to the positive electrode terminal 31 and the negative electrode terminal 32 of the electricity storage device 1 accommodated therein, and is drawn out of the container 110 and connected to an external circuit, and the external positive electrode terminal 121 and the external negative electrode terminal 122. Is provided. In addition, a connection base 125 for connecting the positive electrode terminal 31 and the negative electrode terminal 32 of the electricity storage device 1 to the external positive electrode terminal 121 and the external negative electrode terminal 122, respectively, is provided in the housing portion 113.

  The connection base 125 includes a positive connection base 125a to which the positive terminal 31 is connected and a negative connection base 125b to which the negative terminal 32 is connected. The positive electrode connection base 125 a and the negative electrode connection base 125 b are respectively provided with a positive electrode connection terminal 126 electrically connected to the external positive electrode terminal 121 and a negative electrode connection terminal 127 electrically connected to the external negative electrode terminal 122. . The positive electrode connection terminal 126 and the negative electrode connection terminal 127 are joined to the positive electrode terminal 31 and the negative electrode terminal 32 of the electricity storage device 1 accommodated in the container 110 by welding or the like, respectively.

  In the state where the bellows-shaped power storage device 1 is housed in the container 110, the positive electrode terminal 31 is disposed at a position higher than the bottom surface portion 113 a of the housing portion 113 than the negative electrode terminal 32. For this reason, in the connection base 125, a step is formed between the positive electrode connection base 125a and the negative electrode connection base 125b so that the positive electrode connection base 125a is higher than the bottom surface portion 113a of the housing portion 113 than the negative electrode connection base 125b. ing. Thereby, the positive terminal 31 connected at one end of the electricity storage device 1 and the negative terminal 32 connected at the other end of the electricity storage device 1 are forced from the one end and the other end of the electricity storage device 1, respectively. It is possible to connect to the connection base 125 without changing the height.

  Furthermore, a support member 130 that supports the container 110 is provided on the back surface of the rectangular parallelepiped container main body 111. The support member 130 is fixed to the substrate by welding or the like together with the external positive terminal 121 and the external negative terminal 122 at the time of mounting.

  The power storage device 1 configured as described above includes a plurality of capacitor elements 2 that are arranged to face each other with separators 12 and that have electrodes 11a and 11b having different polarities. An electrode 11a of the first capacitor element, a second capacitor element, one of any two adjacent capacitor elements 2 that are electrically connected in series with each other, and the other is a second capacitor element. By providing the metal current collector 13 that electrically connects the electrode 11b of the capacitor element, the plurality of capacitor elements 2 are electrically connected in series, and each of the plurality of capacitor elements 2 included in the power storage device 1 is provided. At least one current collector 13 among the current collectors 13 connected to the first capacitor element to which the current collector 13 is connected And the electrode 11a, is bent between the electrodes 11b of the second capacitor element collector 13 is connected.

  According to the electricity storage device 1 configured as described above, the current collector 13 is bent to stack the first capacitor element and the second capacitor element that are electrically connected in series via the current collector 13. Can be in a state. That is, since the electricity storage device 1 can stack capacitor elements simply by bending them, the capacitor elements can be stacked more than when they are electrically connected in series by sequentially stacking individual capacitor elements one by one. It can be done easily.

  Further, the electrode 11b of an arbitrary first capacitor element connected to the bent current collector 13 and the capacitor element 2 to which the electrode 11a is connected via the current collector 13 are defined as a third capacitor element, and the first capacitor The current collector 13 that electrically connects the electrode 11b of the element and the electrode 11a of the third capacitor element is connected to the electrode 11b of the first capacitor element to which the current collector 13 is connected and the current collector 13 It is not bent with respect to the electrode 11a of the third capacitor element.

  Accordingly, the number of capacitor elements 2 to be stacked can be reduced in accordance with the number of current collectors 13 that are not bent. In the electricity storage device 1, the direction in which the capacitor elements 2 are stacked (hereinafter referred to as element stacking direction). )) Can be shortened.

  Further, the capacitor element 2 to which the electrode 11a of the arbitrary first capacitor element and the electrode 11a are connected via the current collector 13 is a fourth capacitor element, and the first capacitor element and the second capacitor element are arranged. The arrangement direction (longitudinal direction D1 of the support film 3) and the arrangement direction (short direction D2 of the support film 3) in which the first capacitor element and the fourth capacitor element are arranged are orthogonal to each other.

  Thereby, the number of capacitor elements 2 arranged along the longitudinal direction D1 can be reduced according to the capacitor elements 2 arranged along the short direction D2, and the dimension of the longitudinal direction D1 in the electricity storage device 1 can be reduced. Can be shortened.

The electricity storage device 1 includes a support film 3 having a current collector 13 formed on the surface.
Thereby, the process of forming the pattern of the current collector 13 on the support film 3 by a method combining printing and etching can be employed in the method for manufacturing the electricity storage device 1. As a result, when the number of capacitor elements 2 constituting the electricity storage device 1 is increased, the number of current collectors 13 corresponding to the increase in the number of capacitor elements 2 is prepared, and the current collectors 13 are arranged one by one. The necessary number of current collectors 13 can be collectively formed on the support film 3 by a method that combines printing and etching, and the electrode 11 can be further formed on the support film 3 without the work of connecting to the substrate 2. Therefore, it is possible to suppress the manufacturing process from becoming complicated.

  Further, in the power storage device module 100 configured by storing the power storage device 1 in the container 110, the positive electrode terminal 31 and the negative electrode terminal 32 of the power storage device 1 stored in the container 110 are connected to the outside of the container 110. In addition, an external positive terminal 121 and an external negative terminal 122 that are drawn out of the container 110 and connected to an external circuit, and a support member 130 that supports the container 110 are provided.

  Thereby, the load of the electrical storage device module 100 applied to the external positive electrode terminal 121 and the external negative electrode terminal 122 can be reduced by the support member 130, and damage to the external positive electrode terminal 121 and the external negative electrode terminal 122 can be suppressed.

  In the embodiment described above, the polarizable electrode 11 is the first electrode and the second electrode in the present invention, the capacitor element 2 is the power storage element in the present invention, the current collector 13 is the connection member in the present invention, and the longitudinal direction D1 is the present invention. The first arrangement direction and the short direction D2 are the second arrangement direction in the present invention, and the support film 3 is a sheet member in the present invention.

(Second Embodiment)
The second embodiment of the present invention will be described below. In the second embodiment, only parts different from the first embodiment will be described.

The electricity storage device 1 of the second embodiment is the same as that of the first embodiment except that the capacitor element 2 is a lithium ion capacitor instead of an electric double layer capacitor.
FIG. 6A is a side view showing the structure of the electricity storage device 1 of the second embodiment, and FIG. 6B is a plan view showing the structure of the electricity storage device 1 of the second embodiment. In FIG. 6B, the upper structure and the lower structure are shown separately with the separator in FIG.

  The capacitor element 2 of the second embodiment is a lithium ion capacitor, and as shown in FIGS. 6A and 6B, a pair of electrodes 51 composed of a positive electrode and a negative electrode are arranged opposite to each other with a separator 12 therebetween. It is comprised by letting. Furthermore, the capacitor element 2 includes a current collector 53 disposed so as to face the electrode 51 on the side opposite to the separator 12 with the electrode 51 interposed therebetween.

  6A, the upper electrode 51 and the current collector 53 in FIG. 6A are respectively sandwiched between the electrode 51a and the current collector 53a, and the lower electrode 51 and the current collector in FIG. The electric bodies 53 are referred to as an electrode 51b and a current collector 53b, respectively.

  The electrode 51a is a positive electrode of a lithium ion capacitor, and as the positive electrode active material, for example, activated carbon powder, a conductive polymer, a polyacene organic semiconductor, or the like is used. The electrode 51b is a negative electrode of a lithium ion capacitor, and as the negative electrode active material, for example, graphite, hard carbon, polyacene organic semiconductor, or the like is used. The negative electrode active material occludes and carries lithium ions.

  As a material of the current collector 53a, for example, aluminum, stainless steel or the like is used. Further, as the material of the current collector 53b, for example, copper, stainless steel or the like is used. In the present embodiment, aluminum is used for the current collector 53a, and copper is used for the current collector 53b.

  In the present embodiment, the thicknesses of the electrode 51a, the electrode 51b, the separator 12, the current collector 53a, and the current collector 53b are 80 μm, 20 μm, 20 μm, 35 μm, and 20 μm, respectively.

  Then, the current collector 53b of a certain capacitor element 2 and the current collector 53a of the capacitor element 2 adjacent to the capacitor element 2 are, for example, anisotropically conductive through the through hole 12a formed in the separator 12. They are electrically connected by a conductive adhesive 56 such as a film (ACF). Thereby, also in the electrical storage device 1 of 2nd Embodiment, as shown in FIG. 4, the several capacitor element 2 is electrically connected in series.

  The power storage device 1 configured as described above includes a plurality of capacitor elements 2 that are arranged to face each other with the separator 12 therebetween and have electrodes 51a and 51b having different polarities, and the plurality of capacitor elements 2 are provided. An electrode 51a of the first capacitor element, the second capacitor element being one of the two adjacent capacitor elements 2 that are electrically connected in series with each other, and the other is the second capacitor element. By providing the metal current collector 53 that electrically connects the electrode 51b of the capacitor element, the plurality of capacitor elements 2 are electrically connected in series, and each of the plurality of capacitor elements 2 included in the power storage device 1 is provided. At least one current collector 53 among the current collectors 53 connected to the first capacitor element to which the current collector 53 is connected And the electrode 51a, is bent between the electrodes 51b of the second capacitor element collector 53 is connected.

  According to the electricity storage device 1 configured as described above, the current collector 53 is bent to stack the first capacitor element and the second capacitor element that are electrically connected in series via the current collector 53. Can be in a state. That is, since the electricity storage device 1 can stack capacitor elements simply by bending them, the capacitor elements can be stacked more than when they are electrically connected in series by sequentially stacking individual capacitor elements one by one. It can be done easily.

In the embodiment described above, the electrode 51 is the first electrode and the second electrode in the present invention, and the current collector 53 is the connection member in the present invention.
As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example, As long as it belongs to the technical scope of this invention, a various form can be taken.

  For example, in the above-described embodiment, for example, the capacitor elements 2 arranged in 2 rows × 5 rows are arranged on one surface, and the support film 3 is bent on each surface to form the bellows-shaped power storage device 1. Showed things. However, the number of capacitor elements 2 arranged on one surface is not limited to the above, and may be vertical N columns × horizontal M columns (N and M are integers of 1 or more).

  In addition, when charging the electrical storage device 1 in which the plurality of capacitor elements 2 are connected in series, it is necessary to equalize the charging voltage of each capacitor element 2 constituting the electrical storage device 1. For this reason, an electronic circuit or an element (electric resistance, diode, etc.) for equalizing the charging voltage of each capacitor element 2 may be provided in the electricity storage device 1. And the said electronic circuit or the said element for voltage equalization is good to arrange | position on the outer side of the support film 3, ie, the surface of the side in which the electrical power collector is not formed.

  Moreover, in the said embodiment, the thing using an electric double layer capacitor or a lithium ion capacitor as an electrical storage element of the electrical storage device 1 was shown. However, a lithium ion secondary battery may be used as the storage element.

  Moreover, in the said 1st Embodiment, the electrical storage device 1 comprised by arrange | positioning the several polarizable electrode 11 on the separator 12 of 1 sheet was shown. However, it is preferable to provide a separator separately for each of the plurality of capacitor elements 2 constituting the electricity storage device 1. This is to avoid the formation of a capacitor between the positive electrode of a certain capacitor element 2 and the negative electrode of the capacitor element 2 adjacent thereto. In order to separate the separator for each capacitor element 2, a separator may be provided for each capacitor element 2, or as shown in FIG. 7, using an inkjet or the like in a region where the polarizable electrode 11 is not disposed. The separator 12 may be impregnated with a dense material 21 (for example, silicone rubber, epoxy resin, etc.) to form a lattice pattern on the separator 12. In addition, the material for separating the separator preferably has moderate elasticity. As a result, the separator 12 is separated for each capacitor element 2 with the dense material 21 interposed therebetween.

  Moreover, in the said 1st Embodiment, although the support member 130 showed what was formed in the rectangular parallelepiped shape (refer FIG. 5), as shown to Fig.8 (a), it is made to form in a cylindrical shape. Also good. Moreover, in the said 1st Embodiment, although the external positive electrode terminal 121 and the external negative electrode terminal 122 showed what was provided from the side surface of the rectangular parallelepiped container main body 111, as shown in FIG.8 (b), You may make it protrude from the back surface of the container main body 111, and may be made. In this case, the external positive electrode terminal 121 and the external negative electrode terminal 122 are provided to face the positive electrode connection terminal 126 and the negative electrode connection terminal 127, respectively, on the back surface of the rectangular parallelepiped container body 111. The positive electrode connection terminal 126 and the negative electrode connection terminal 127 penetrate the connection base 125 and the bottom surface of the container main body 111 and are pulled out to the back surface side of the container main body 111 to be connected to the external positive electrode terminal 121 and the external negative electrode terminal 122. The

  DESCRIPTION OF SYMBOLS 1 ... Power storage device, 2 ... Capacitor element, 3 (3a, 3b) ... Support film, 11 (11a, 11b), 51 (51a, 51b) ... Electrode, 12 ... Separator, 13 (13a, 13b), 53 (53a 53b) ... current collector, 21 ... dense material, 31 ... positive electrode terminal, 32 ... negative electrode terminal, 100 ... power storage device module, 110 ... container, 121 ... external positive electrode terminal, 122 ... external negative electrode terminal, 125 ... Connection base, 130 ... support member

Claims (6)

A plurality of power storage elements each having a first electrode and a second electrode that are disposed opposite to each other with a separator and having different polarities, and the plurality of power storage elements are electrically connected in series with each other. An electricity storage device,
Of the two storage elements adjacent to each other, one is the first storage element and the other is the second storage element, and the first electrode of the first storage element, the second electrode of the second storage element, A plurality of power storage elements are electrically connected in series by providing a metal connection member that electrically connects
At least one of the connection members connected to each of the plurality of power storage elements included in the power storage device includes the first electrode of the first power storage element to which the connection member is connected, and the connection member is found folded between said second electrode of said second power storage elements connected,
In a state where the connection member is not bent, the plurality of power storage elements are arranged in a two-dimensional matrix along a direction orthogonal to a direction in which the first electrode and the second electrode face each other,
In a state where the connection member is not bent, the plurality of connection members arranged on one side with the separator interposed therebetween are arranged on the other side with the separator interposed therebetween. A power storage device , wherein a direction in which the plurality of connection members are aligned is orthogonal . The separator is
2. The structure according to claim 1 , wherein the separator is impregnated with a material different from the separator so that at least a part of the separator is separated for each power storage element with the different material interposed therebetween. Power storage device. The electrical storage device according to claim 1 , further comprising: a sheet member having the connection member formed on a surface thereof. A device module configured by storing a plurality of power storage elements in a container,
The power storage device according to any one of claims 1 to 3 is housed in the container. The outside of the container is connected to each of the positive electrode terminal and the negative electrode terminal of the electricity storage device accommodated in the container and supports the container with the external positive electrode terminal and the external negative electrode terminal drawn out of the container The device module according to claim 4 , wherein the device module is provided. The method for manufacturing an electricity storage device according to any one of claims 1 to 3 , further comprising a step of forming a pattern of the connection member on the sheet member by a method combining printing and etching.