JP2012079833A - Power storage package structure, electrochemical device, and electrochemical module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrochemical device which has high energy density and reduces the size.SOLUTION: A power storage package structure 20 of this invention includes a frame like part (a lower frame part 202 and an upper frame part 203) formed by a pair of insulators which face each other across a bonding surface, a lid attached to an opening of the frame like part and forming a sealed structure, and an extraction electrode 204 formed on an outer wall of at least one of the pair of frame like parts. Electric power is supplied easily from the extraction electrode 204 by attaching an electrode structure of the power storage package structure. Therefore, a highly efficient electrochemical device is obtained.

Description

  The present invention relates to a power storage package structure, an electrochemical device, and an electrochemical module.

2. Description of the Related Art Conventionally, power storage devices such as secondary batteries such as lithium ion secondary batteries are expected in various fields such as automobiles and peak power leveling as large capacity power storage devices. However, since it is a chemical battery, there is a problem that it cannot cope with rapid charge / discharge. On the other hand, an electric double layer capacitor is characterized by being capable of accommodating rapid charging / discharging without chemical reaction because it stores electricity by physical action, but has a problem of small capacity. Therefore, by combining these features, a lithium ion capacitor (LiC) has been proposed as an energy storage device having a higher energy density than that of a lithium ion battery.
Lithium ion capacitors are expected in terms of large capacity, rapid charge / discharge, and long life.

  Conventionally, as a structure of an electricity storage device, for example, a positive electrode and a negative electrode are arranged so that different poles face each other, and the stacked electrode structure is put in a package in a so-called 99-fold manner. A structure for injecting an electrolytic solution is known (for example, Patent Document 1). Such ninety-nine folds are excellent in that an electrode that can be miniaturized can be easily formed because a structure in which electrodes adjacent to each other serve as other poles can be formed by bending one electrode. .

  In addition, in the electrochemical device of Patent Document 2, as shown in FIGS. 26 (a) and (b), a film 120 is used for a flexible outer container, and the electrode structure 110 is accommodated inside the outer container. The sealing portion S is provided on the outer peripheral portion for sealing, and the electrode extraction portion 111c is provided at the sealing end of the outer container. P is an outer peripheral end of the outer container, that is, a package line.

  Moreover, in the electrical storage element of patent document 3, a hard container is used as an exterior container, an electrode structure is accommodated in the interior of the exterior container, and an electrode extraction portion is provided on the upper peripheral edge of the exterior container.

  Conventionally, in any of the electricity storage device of Patent Document 1, the electrochemical device of Patent Document 2, and the electricity storage element of Patent Document 3, it is necessary to provide wiring in the outer container in order to energize each layer of the positive electrode and the negative electrode.

Japanese Patent Application Laid-Open No. 08-203539 JP 2009-238493 A JP 2009-88131 A

  Among the prior art documents described above, for example, the power storage device of Patent Document 1 proposes a folded structure of an electrode body that can be accommodated in a package without waste. Absent.

  In addition, the electrochemical device of Patent Document 2 has an advantage of being lightweight because a film is used for a flexible outer container, but it is necessary to provide a seal portion on the outer peripheral portion of the outer container and perform sealing. Therefore, it is necessary to increase the distance from the edge of the electrode structure to the outer periphery of the outer container. In addition, it is necessary to separately provide an electrode extraction part at the sealed end of the outer container, and there is a problem that workability is poor when a plurality of such electrochemical devices are stacked and interconnected.

  Moreover, in the electrical storage element of patent document 3, although the hard container is used as an exterior container, the distance from the edge of an electrode structure to the outer periphery end of an exterior container is large, and an exterior container will enlarge.

  For this reason, any of the electricity storage device of Patent Literature 1, the electrochemical device of Patent Literature 2, and the electricity storage element of Patent Literature 3 has a dead space, resulting in a low energy density per volume. The increase in the energy density per volume is a major problem because it cannot avoid the increase in size.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an energy storage package structure, an electrochemical device, and an electrochemical module that have a high energy density per volume and can be miniaturized.

The present invention has found that the above-described problems can be solved by the following electricity storage package structure, electrochemical device, and electrochemical module.
[1]
A frame-shaped portion made of a pair of insulators opposed to each other via a joint surface;
A lid that is attached to the opening of the frame-shaped portion and forms a sealed structure;
A power storage package structure comprising: an extraction electrode formed on at least one outer wall of the pair of frame-like portions.
[2]
The power storage package structure according to [1],
The electrical storage package structure, wherein the extraction electrode includes a conductor layer extending from the joint surface to an outer wall of the frame-like portion.
[3]
The power storage package structure according to [1] or [2],
The power storage package structure has opposing main surfaces and four side surfaces,
A power storage package structure having an extraction electrode on each of four side surfaces.
[4]
The power storage package structure according to any one of [1] to [3],
The power storage package structure has opposing main surfaces,
A power storage package structure in which a heat sink is mounted on at least one of the main surfaces.
[5]
The power storage package structure according to [4],
The heat dissipation plate is a power storage package structure that is joined to the frame-shaped portion and constitutes at least one of the lids.
[6]
The power storage package structure according to [4] or [5],
The heat dissipation plate is a power storage package structure that protrudes outward from the surface of the frame-shaped portion.
[7]
The electrode plate laminated through the separator in the electricity storage package structure according to any one of [1] to [6] is sealed together with the electrolyte solution,
The electrochemical device, wherein the electrode plate is sandwiched between the pair of frame-like portions such that a current collecting tab derived from the electrode plate is in contact with the conductor layer.
[8]
The electrochemical device according to [7],
The current collecting tab is an electrochemical device that is bent along the outer wall of the frame-like portion and joined to the conductor layer.
[9]
The electrochemical device according to [7] or [8],
The extraction electrode consists of a conductor layer formed so as to reach the outer wall of the frame-shaped portion from the joint surface,
The current collecting tab is an electrochemical device bonded to the conductor layer at the bonding surface.
[10]
The electrochemical device according to any one of [7] to [9];
An electrochemical module comprising an external current collecting package attached to the extraction electrode.
In the present invention, each of the positive electrode plate and the negative electrode plate constituting the electrode structure is composed of a main body portion, a current collecting tab constituting a lead-out lead portion derived from the main body portion, and an external current collecting lead portion. It shall be. Here, the external current collecting lead portion may be connected to the current collecting tab or may be integrally formed. When the external current collecting lead part is integrally formed, the inner part of the package structure is called a current collecting tab and the outer part of the power storage package structure is called an external current collecting lead part.

According to the electricity storage package structure of the present invention, since the take-out electrodes are provided on the outer walls of the pair of frame-like portions facing each other through the joint surface, a current collector such as a current collecting tab is provided on the frame-like portion. It is possible to securely connect the current collector and the extraction electrode with good contact.
Further, since no film is used for the outer container, unlike the conventional electrochemical device of Patent Document 2, it is not necessary to provide a sealing region on the outer peripheral edge, and the lead-out portion of the current collecting tab can be shortened. Moreover, since it is comprised so that a current collection tab may be inserted | pinched between a pair of frame-shaped part, the current collection package structure of this invention rather than the case of either the electrochemical device of patent document 2, and the electrical storage element of patent document 3 Since the current collecting tab can be shortened and the volume of the entire package structure including the current collecting tab is reduced, the size can be reduced. As a result, the energy storage package structure of the present invention can increase the energy density [energy amount per volume].
The current collector tab can be connected to the extraction electrode using a conductive paste, and can be electrically connected by partial heating by laser irradiation, welding, brazing, soldering, etc. Connection processing can be performed simultaneously.

  Further, in the electricity storage package structure of the present invention, by using ceramic for the frame-like portion and forming the extraction electrode, a heat flow can be formed through the electrolytic solution and the current collecting tab, and heat dissipation can be improved. Furthermore, heat dissipation can be further improved by using a ceramic having good thermal conductivity such as aluminum nitride or alumina for the frame-like portion.

  Furthermore, the extraction electrode can be formed by using a resin base material for the frame-like portion and using a metal foil such as a copper foil, a conductive thin film or a thick film. By using a resin substrate for the frame-shaped portion, it is possible to form an exterior container that is easy to shape and has high dimensional accuracy.

  Further, in the electricity storage package structure of the present invention, the extraction electrode is composed of a conductor layer on the outer wall of the frame-shaped part or a conductor layer coated with an insulating film, so that an electrochemical device having a small occupied area without causing an increase in outer shape Can be formed. Furthermore, by configuring the extraction electrode with a conductor layer that extends from the joint surface to the outer wall of the frame-like part, it is possible to achieve efficient, reliable, and high-contact electrical connection simply by sandwiching the current collector between the joint surface. be able to. Further, by configuring the extraction electrode with the pattern of the conductor layer formed on the outer wall of the frame-shaped portion, the patterning can be performed freely and efficiently.

In the electricity storage package structure of the present invention, since the extraction electrodes are provided on the four side surfaces, current can be efficiently collected from the tabs led out from the electrodes in four directions. Furthermore, since the extraction electrode is formed on at least one outer wall of the pair of frame-shaped portions, current can be collected efficiently without increasing the size of the power storage unit.
Furthermore, in the electricity storage package structure of the present invention, a package structure with high heat dissipation can be formed by attaching a heat sink to at least one of the main surfaces of the package structure.
Further, by forming the heat radiating plate so as to constitute at least one of the lids by being joined to the frame-shaped portion, it is possible to provide a power storage package structure with higher heat radiating efficiency and excellent heat radiating properties. It becomes possible.

  Moreover, in the electrical storage package structure of this invention, heat dissipation can be improved more by comprising a heat sink so that it may protrude outward from the surface of a frame-shaped part. Therefore, sufficient heat dissipation can be obtained even when the power storage package structure of the present invention is stacked and used.

  Moreover, according to the electrochemical device of the present invention, the electricity storage package structure of the present invention is applied to the extraction electrode in which the current collection tab led out from the electrode plate is formed on at least one outer wall of the pair of frame-shaped portions. By being configured to be sandwiched between a pair of frame-like portions so as to come into contact with each other, a small, reliable and highly contactable electrical connection can be realized.

  Moreover, it can be made small and highly efficient by comprising a current collection tab so that it may be bent along the outer wall of a frame-shaped part, and it may be joined to a conductor layer.

  Further, the current collecting tab may be sandwiched so as to fit between the frame portions without bending the tip. Since the current collecting tab is protected by the frame-like portion, the connection reliability of the extraction electrode can be improved.

  In addition, according to the electrochemical module of the present invention, it is possible to provide a smaller and more excellent electrochemical module by mounting the connector portion for external connection on the extraction electrode of the electrochemical device of the present invention. It becomes possible.

Furthermore, the current collecting tab, that is, the lead portion drawn out from the electrode may be disposed at any portion of the electrode end face. And it is desirable to form the joint surface following the extraction electrode of the electricity storage package structure in accordance with each lead portion. The distance between the joint surface and each lead portion is preferably shortened. By doing so, a space for routing the lead portion is not required, and the size of the storage container can be further reduced.
According to the electrochemical module of the present invention, since the electrode and the external terminal can be connected via the thin extraction electrode and the current collecting tab arranged on the inner side surface of the electricity storage package structure, the volume of the package structure can be increased. On the other hand, the ratio of the volume of the power storage unit can be increased.
In addition, since the electrochemical module of the present invention can easily collect current from each layer of electrodes stacked in ninety-nine folds, a current collecting structure with low electrical resistance can be provided. Therefore, a capacitor suitable for handling a large current can be provided, and even if the electrode thickness is reduced, the electric resistance can be reduced, so that a capacitor having a large capacity can be provided.

The perspective view which shows the external appearance of the lithium ion capacitor of Embodiment 1 of this invention BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a power storage package structure for a lithium ion capacitor according to a first embodiment of the present invention, (a) is an upper frame portion, and (b) is a lower frame portion. The figure which shows the electrode structure used for the lithium ion capacitor of Embodiment 1 of this invention, (a) is the perspective view which showed the electrode structure typically, (b) is the upper surface seen from the positive electrode plate of the electrode structure (C) is a top view of the electrode structure as viewed from the negative electrode plate, (d) is a diagram showing the outer shape of the positive electrode plate and the negative electrode plate before folding. Explanatory drawing which shows the manufacturing process of the lithium ion capacitor of Embodiment 1 of this invention, It is a figure which shows the junction part of the electrode structure to the electrical storage package structure of the electrode structure in the lithium ion capacitor of Embodiment 1 of this invention, (a) is a principal part expanded cross section which shows the current collection part of a positive electrode Figure, (b) is an enlarged cross-sectional view of the main part showing the current collector of the negative electrode The front view of the lithium ion capacitor of Embodiment 1 of this invention, (a) and (b) are the figures seen from the extraction electrode side of a positive electrode and a negative electrode, respectively (A) is a principal part expanded sectional view of the lithium ion capacitor of Embodiment 1 of this invention, (b) is the same top view. (A) And (b) is a figure which shows the formation surface of the positive electrode in the lithium ion capacitor of the modification 1 of this invention, and the formation surface of a negative electrode (A) And (b) is a figure which shows the formation surface of the positive electrode in the lithium ion capacitor of the modification 2 of this invention, and the formation surface of a negative electrode (A) And (b) is a figure which shows the formation surface of the positive electrode in the lithium ion capacitor of the modification 3 of this invention, and the formation surface of a negative electrode The exploded perspective view of the electrical storage package structure used for the lithium ion capacitor of the modification 3 of this invention The perspective view which shows the external appearance of the lithium ion capacitor of Embodiment 2 of this invention (A) And (b) is the exploded perspective view of the electrical storage package structure of the lithium ion capacitor of Embodiment 2 of this invention Explanatory drawing which shows the manufacturing process of the lithium ion capacitor of Embodiment 2 of this invention. The figure which shows the cross section of the electrical storage package structure of the modification 4 of this invention The figure which shows the cross section of the electrical storage package structure of the modification 5 of this invention The figure which shows the cross section of the electrical storage package structure of the modification 6 of this invention The figure which shows the electrode structure of the modification 3 of this invention The figure which shows the electrode structure of the modification 7 of this invention The figure which shows the electrical storage module of Embodiment 3 of this invention It is a figure which shows the component of the electrical storage module of Embodiment 3 of this invention, (a) is a perspective view of a lithium ion capacitor, (b) is a perspective view of an external current collection package. The figure which shows the assembly process of the electrical storage module of Embodiment 3 of this invention The figure which shows the lamination type electrical storage module of Embodiment 4 of this invention It is a figure which shows the structural member of the laminated | stacked electrical storage module of Embodiment 4 of this invention, (a) is a perspective view of an electrical storage module, (b) is a perspective view of a module package. The figure which shows the assembly process of the laminated | stacked electrical storage module of Embodiment 4 of this invention. (A) is a principal part expanded sectional view of the conventional electrochemical device, (b) is a principal part enlarged top view of the conventional electrochemical device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 6 are diagrams showing Embodiment 1 of the present invention. FIG. 1 is a perspective view showing the appearance of a lithium ion capacitor that is an electrochemical device according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view of a storage package structure of the lithium ion capacitor of the present invention, and FIG. An upper frame part and (b) show a lower frame part. 3 is a perspective view schematically showing an electrode structure of a lithium ion capacitor of the present invention, FIG. 4 is an explanatory view showing a manufacturing process of the lithium ion capacitor of the present invention, and FIG. It is a figure which shows the junction part of an electrode structure, (a) is a principal part expanded sectional view which shows the collector part of a positive electrode, (b) is a principal part expanded sectional view which shows the collector part of a negative electrode, FIG. It is a front view of the lithium ion capacitor of the present invention. 3A is enlarged in the thickness direction (Z1-Z2) of the lithium ion capacitor of the present invention of FIG. 1 in order to explain how it is folded.

  As shown in FIG. 1, a power storage package structure 20 of a lithium ion capacitor according to an embodiment of the present invention has a pair of frame-shaped portions (a lower frame portion 202 and an upper frame portion 203) facing each other through a joint surface. A lid that is attached to the opening of the frame-like portion (lower frame portion 202, upper frame portion 203) and forms a sealed structure, and a pair of frame-like portions (lower frame portion 202, upper frame portion) 203) and an extraction electrode 204 formed on the outer wall. A pair of frame-like portions (lower frame portion 202 and upper frame portion 203) are formed of an alumina molded body, and a pattern of a conductor layer is formed to constitute the extraction electrode 204. This lid is made of a copper foil whose inner side is insulated, and constitutes heat sinks 201 and 206.

  As shown in FIG. 2, no conductor layer made of copper foil is formed on the joint surfaces 202S and 203S between the lower frame portion 202 and the upper frame portion 203 constituting the pair of frame-shaped portions. The conductor layer is led out to the outer wall of the frame-like portion (the lower frame portion 202 and the upper frame portion 203), and constitutes the extraction electrode 204 (positive electrode 204a, negative electrode 204b).

  Further, the heat radiating plate includes heat radiating pieces 201F and 206F that protrude outward from the surface of the frame-like portion (the lower frame portion 202 and the upper frame portion 203).

  3A shows a perspective view, and FIGS. 3B and 3C show the AA plane and the BB plane of FIG. 3A in the electricity storage package structure 20, respectively. In addition, the electrode structure 10 is accommodated. In this electrode structure 10, a positive electrode plate 11 is overlapped with a negative electrode plate 13 via a separator 12 and is folded. Although FIG. 3A shows a laminated structure for three layers, the number of layers of the laminated structure is not limited. Generally, it is often used as a laminated structure of about 10 layers, and any number of layers may be stacked. The positive electrode plate and the negative electrode plate of the electrode structure 10 are shown in FIG. The current collecting tabs 11b of the positive electrode plate 11 are led out in parallel to the fold direction of the positive electrode plate itself, one pair at a position facing each other for each layer. On the other hand, the current collecting tabs 13b of the negative electrode plate 13 are led out in parallel to the fold direction of the negative electrode plate itself, one pair at a position facing each other for each layer. In this laminated structure, the positive electrode plates and the negative electrode plates are alternately stacked via the separators, and the shape can be laminated in a rectangular parallelepiped or a cube, so that a capacitor having a large capacity without waste of space can be provided. In this laminated structure, the current collecting tabs are alternately led out from the respective layers and connected to the extraction electrode, so that the internal resistance can be reduced.

The positive electrode plate 11 includes a main body portion 11a, a current collecting tab 11b, and an external current collecting lead portion 11c. And in this current collection tab 11b and the external current collection lead part 11c, the core material which consists of an aluminum plate is exposed, and the positive electrode active material is apply | coated to both surfaces of the core material at the main-body part. Here, a positive electrode active material mainly composed of spinel type lithium manganate represented by LiMnO ₄ is mixed with a fluororesin binder and used as a positive electrode mixture. In the present embodiment, as shown in FIG. 3D, the current collecting tab 11b is formed integrally with the main body 11a, and the tab is formed in the lateral direction of the electrode before folding. In addition, you may use the current collection tab which formed only the main-body part 11a with the continuous strip | belt-shaped body, and comprised with another member. Alternatively, the positive electrode current collecting tab 11b may be led out in one direction perpendicular to the longitudinal direction of the strip. The tip of the current collecting tab 11b is joined to the extraction electrode as the external current collecting lead portion 11c.

  On the other hand, the negative electrode plate 13 is also composed of a main body portion 13a, a current collecting tab 13b, and an external current collecting lead portion 13c, like the positive electrode plate. And as shown in FIG.3 (c), in this current collection tab 13b and the external current collection lead part 13c, the core material which consists of a copper plate is exposed, and a negative electrode active material is both surfaces of a core material in a main-body part. Has been applied. Here, a negative electrode active material that can insert and desorb lithium ions, a rubber-based binder, and water are mixed to form a negative electrode mixture, which is applied to the core material. Note that as the negative electrode active material, a carbon-based material capable of inserting and desorbing lithium ions, such as graphite, carbon black, coke, glassy carbon, carbon fiber, or a fired body thereof, is preferable. The tip of the current collecting tab 13b is joined to the extraction electrode as an external current collecting lead portion 13c.

  The positive electrode plate and the negative electrode plate were folded into ninety-nine folds via a polypropylene separator 12 to obtain an electrode structure 10. That is, the positive electrode plate and the negative electrode plate are formed as strips, and are alternately folded through the separators 12 in directions orthogonal to each other.

  As the electrolytic solution, an electrolytic solution mainly composed of ethylene carbonate (EC) and propylene carbonate (PC) is used.

  Here, as described above, the current collecting tabs 11b and 13b are led out in the vicinity of the center of the pair, one pair on each opposite side of the quadrangle constituting the folded electrode structure (FIG. 3B). And FIG. 3 (c)) an extraction electrode 204 (which is sandwiched between the joint surfaces 202S and 203S of the divided portion of the electricity storage package structure 20 and is bent along the outer wall of the frame-shaped portion, and made of a conductor layer formed on the outer wall. The positive electrode 204a and the negative electrode 204b) are joined.

  As shown in FIG. 4, an enlarged perspective view of the main part of the current collector tab 11 b of the positive electrode and an enlarged sectional view of the main part of the positive electrode 11 in FIG. It is led out along the joint surfaces 202S and 203S between the frame part 202 and the upper frame part 203, and joined to the extraction electrode 204 formed by applying the aluminum paste 207 and the Ag paste 208 to the outer wall part. Yes. The joint between the current collecting tab 11b and the external current collecting lead portion 11c and the extraction electrode 204 is joined with good adhesion by heat of fusion.

  As shown in FIG. 5B, an enlarged cross-sectional view of the main part of the negative electrode 13, the negative electrode current collecting tab 13 b includes a lower frame portion 202 and a pair of frame portions (202, 203) from the electrode structure 10. Joined to the negative electrode take-out electrode 204b formed by applying Ag paste 208 on the three-layer film 209 of Ti-Ag-Cu on the outer wall along the joining surfaces 202S and 203S between the upper frame 203 Has been. The junction between the current collecting tab 13b and the external current collecting lead 13c and the negative electrode take-out electrode 204b is bonded with good adhesion by heat of fusion.

Next, the manufacturing method of the lithium ion capacitor of this Embodiment is demonstrated.
First, the manufacturing method of the electrical storage package structure 20 is demonstrated.
A frame-shaped part is formed by forming a molded body by compression molding using alumina as a material and firing it. Further, a positive electrode extraction electrode 204a and a negative electrode extraction electrode 204b are respectively formed on the outer wall of the frame-shaped portion. In the present embodiment, as shown in FIGS. 2A and 2B, the positive electrode extraction electrode 204a and the negative electrode extraction electrode 204b are provided on the outer wall of the frame-shaped portion composed of the upper frame portion 203 and the lower frame portion 202. Each pair is formed opposite to each other. Here, on the positive electrode side, as shown in FIG. 5A, an aluminum paste is applied to form an aluminum layer 207 and covered with an Ag paste 208 to form a positive electrode extraction electrode 204a. On the other hand, on the negative electrode side, as shown in FIG. 5B, a thin film having a three-layer structure of Al, Ag, and Cu, that is, a three-layer film 209 is formed by sputtering and covered with Ag paste 208 to form a negative electrode take-out electrode 204b. .
Heat dissipation plates 201 and 206 made of copper foil are joined to the upper frame portion 203 and the lower frame portion 202 formed in this way.

Next, an electrode structure and a manufacturing method thereof will be described. 3A is a perspective view schematically showing the electrode structure, FIG. 3B is a top view seen from the positive electrode plate of the electrode structure, and FIG. 3C is a top view seen from the negative electrode plate of the electrode structure. FIG. 3D is a diagram showing the outer shape of the positive electrode plate and the negative electrode plate before folding.
In the production of the positive electrode plate, an aluminum plate is punched, and as shown in FIG. 3D, a strip-shaped core material having a main body portion 11a, a current collecting tab 11b, and an external current collecting lead portion 11c is formed. It is formed continuously in layers. The positive electrode active material described above is applied to both surfaces of the core material. Here, the positive electrode plate 11 shall apply | coat the positive electrode active material.
On the other hand, in manufacturing the negative electrode plate, a copper plate is punched, and this negative electrode plate 13 is also provided with a main body 13a, a current collecting tab 13b, and an external current collecting lead, like the positive electrode plate shown in FIG. A belt-like core material having a portion 13c is continuously formed for 10 layers. The negative electrode active material described above is applied to both surfaces of the core material. Here, it is assumed that the negative electrode plate is coated with a negative electrode active material.

The positive electrode plate 11 and the negative electrode plate 13 are folded in ninety-nine folds from directions orthogonal to each other via a polypropylene separator 12 to form the electrode structure 10.
FIG. 3A shows a perspective view of the electrode structure 10 formed in this way. The positive electrode plate 11 is overlapped with the negative electrode plate 13 via the separator 12 and folded. A top view of the folded positive electrode plate is shown in FIG. Moreover, the top view seen from the negative electrode plate is shown in FIG. In this way, the current collecting tabs 11b of the positive electrode plate 11 are led out in parallel to the direction of the folds of the positive electrode plate, one by one at the mutually opposing positions for each layer, and the current collecting tabs of the negative electrode plate 13 13b is led out in parallel to the direction of the folds of the negative electrode plate, one by one at the position alternately facing each other.

As shown in FIG. 4, the electrode structure 10 is housed in the lower frame portion 202 of the frame-shaped portion of the power storage package structure 20, and the current collecting tabs 11 b and 13 b are respectively connected to the joint surfaces of the sides. It is installed so that it abuts. And the current collection tabs 11b and 13b are inserted | pinched so that the joint surface of the upper frame part 203 may contact | abut.
Then, the joint surfaces are fixed using an adhesive (not shown) made of an epoxy resin.
Here, it is preferable to use a photo-curing type epoxy resin.

Finally, the current collecting tabs 11b and 13b are folded along the extraction electrode 204 and joined by partially heating. The principal part expanded sectional view of this junction part is shown to Fig.5 (a) and (b). Finally, an electrolytic solution is injected into the inside through the injection port 205 (see FIG. 4), and the injection port 205 is sealed.
In this way, the lithium ion capacitor as shown in FIG. 1 is formed.

According to the electricity storage package structure 20, as shown in FIG. 6 (a), the current collector tab 11 b is sandwiched between the portions corresponding to the central portion on each side, as shown in FIG. The external current collecting lead portion 11c at the tip of the current collecting tab 11b is joined to the extraction electrode 204 constituting the positive electrode extraction electrode 204a. With this configuration, the electrical connection between the current collecting tab 11b and the extraction electrode and the physical connection between the bonding surfaces of the pair of frame portions are sufficient.
In addition, as shown in FIG. 6 (b), the current collecting tab 13b is sandwiched between portions corresponding to the central portion on each side, and the external current collecting at the tip of the current collecting tab 13b. The electric lead portion 13c is joined to the extraction electrode 204 constituting the negative electrode extraction electrode 204b. Therefore, the electrical connection between the current collecting tab 13b and the negative electrode take-out electrode 204b and the physical connection between the joint surfaces of the pair of frame portions are sufficient.

  FIG. 7A shows an enlarged cross-sectional view of the main part of the lithium ion capacitor of the present invention, and FIG. 7B shows an enlarged top view of the main part of the lithium ion capacitor of the present invention. By comparing the lithium ion capacitor of FIGS. 7 (a) and (b) with the conventional electrochemical device shown in FIGS. 26 (a) and 26 (b), the outer shape is greatly reduced, and the current collecting tab 11b It can be seen that the length is also significantly shortened. 7 and 26, the electrode structures 10 and 110 have the same dimensions. 7 and 26, (a) is an enlarged sectional view of a main part, (b) is a top view, and (a) is a pp sectional view of (b).

  According to the lithium ion capacitor of the present embodiment, the extraction electrode 204 is provided on the outer wall of the frame-shaped portions 202 and 203 made of a pair of insulators facing each other through the bonding surface. , 203 sandwich the current collecting tabs 11b and 13b, and reliably contact the external current collecting leads 11c and 13c at the tips of the current collecting tabs 11b and 13b with the extraction electrodes 204 (the positive electrode extraction electrode 204a and the negative electrode extraction electrode 204b). Can connect well. Since the distance from the main body part to the inner walls of the frame-like parts 202 and 203 can be minimized, the drawing distance of the current collecting tab can be minimized, and not only the size can be reduced, but also the current collecting tab can be reduced. Resistance loss due to the routing of the electric tab is reduced.

  In addition, since no film is used for the package structure that is an exterior container, unlike the conventional power storage device shown in Patent Document 2, there is no need to provide a sealing region on the outer periphery, and the power storage package of the present embodiment According to the structure, the lead-out portion of the current collecting tab can be shortened. In addition, since the power storage package structure of the present embodiment is configured so that the current collecting tab is sandwiched between the pair of frame-shaped portions, the conventional power storage device shown in Patent Document 1 is shown in Patent Document 2. The current collecting tab can be made shorter than in any of the conventional electrochemical devices. As a result, in the present embodiment, since the volume occupied by the entire package structure including the current collector tabs 11b and 13b is reduced, the power storage package structure can be reduced in size. The energy density (the amount of energy per volume) can be increased. The volume occupied here is not the actual volume of the package structure, but corresponds to the product of the thickness, length, and width of the package structure.

  In the present embodiment, ceramic is used for the frame-like portion, and the extraction electrode is formed using copper foil, thereby forming a heat flow through the electrolytic solution and the current collecting tab, thereby improving heat dissipation. it can. And since alumina is used for a frame-shaped part, heat conductivity is favorable and can also improve heat dissipation. The ceramic constituting the frame portion is not limited to alumina, and other insulating ceramics such as aluminum nitride can be applied. By using aluminum nitride, the thermal conductivity is further improved.

  Further, in the present embodiment, by configuring the extraction electrode with a conductor layer that reaches the outer wall of the frame-shaped portion, the current collector is sandwiched between the bonding surfaces, and only the bonding is performed along the outer wall of the frame-shaped portion. It is possible to realize an electrical connection with good and reliable contact. Here, the positive electrode extraction electrode 204a is easily formed by applying and baking an aluminum paste. The negative electrode take-out electrode 204b connected to the negative electrode is composed of a three-layer film of a Ti layer, an Ag layer, and a Cu layer, and is formed by sputtering or the like.

The connection between the take-out electrode and the current collecting external lead can be easily performed by bringing them into contact with each other and heating and fusing the surfaces. Bonding is also possible by applying a metal paste such as silver paste or copper paste to the joint and curing it.
Furthermore, in the present embodiment, since the heat sinks 201 and 206 are mounted on the main surface of the package structure, a package structure with high heat dissipation can be formed.

Moreover, since the heat sink is configured to protrude outward from the surface of the frame-like portion, the heat dissipation can be further improved. Further, even when the power storage devices are stacked and used, the heat dissipation piece 206F can be in contact with the outside air, so that the heat dissipation can be sufficiently improved.
Moreover, although a heat sink may be made to join to a frame-shaped part, you may comprise the heat sink 206 and a cover body integrally. If the heat radiating plate 206 and the lid are configured integrally, the thermal resistance from the heat generating portion can be further reduced. Therefore, it is possible to provide a power storage package structure with improved heat dissipation efficiency and excellent heat dissipation.

  Further, in the present embodiment, the current collecting tab is bent along the outer wall of the frame-like portion and joined to the conductor layer, so that the area to be joined is increased, sufficient joining is achieved, and the size and height are increased. It can be efficiency.

A modification of the first embodiment of the present invention will be described below.
(Modification 1)
In the first embodiment, as shown in FIGS. 6A and 6B, the extraction electrode is formed on the lower frame portion on the positive electrode formation surface, and the extraction electrode is formed on the upper frame portion on the negative electrode formation surface. . The external current collecting lead portion 11c at the tip of the positive current collecting tab 11b is bent downward and the external current collecting lead portion 13c at the tip of the negative current collecting tab 13b is bent upward and joined. In the first modification, the current collecting tab is bent in the same direction. In this case, it is only necessary to form the extraction electrode only on one frame-like portion. 8A and 8B show a positive electrode formation surface and a negative electrode formation surface in the lithium ion capacitor of Modification 1 of the present invention. In Modification 1, as shown in FIGS. 8A and 8B, the side surface of the lower frame portion 202 is made larger than the side surface of the upper frame portion 203, and the lower frame portion is formed on the positive electrode forming surface and the negative electrode forming surface. An extraction electrode is formed, and the external current collecting leads 11c and 13c at the tips of the positive and negative current collecting tabs 11b and 13b are bent and joined downward. In this case, the joining area can be increased, and the current collecting tabs have the same bending direction, so that simultaneous processing is possible and mounting workability is improved.
Since other parts including the electrode structure 10 are the same as those in the first embodiment, the description thereof is omitted here. However, it goes without saying that the electrode structure is not limited to such a ninety-nine fold structure, and can be applied to other electrode structures such as a laminated body and a wound structure.

(Modification 2)
FIGS. 9A and 9B show the formation surface of the positive electrode and the formation surface of the negative electrode in the lithium ion capacitor of Modification 9 of the present invention. As shown in FIGS. 9A and 9B, in the second modification, the frame-shaped portion has a three-part structure, and the middle frame portion 210 that does not form the extraction electrode has an upper frame portion 203 and a lower frame portion 202. It is a structure sandwiched between them. On the positive electrode forming surface, the current collecting tab 11b is sandwiched between the upper frame portion 203 and the middle frame portion 210, and the external current collecting lead portion 11c at the tip of the positive current collecting tab 11b is bent upward to form the upper frame portion 203. Are in contact with the positive electrode take-out electrode 204a. On the other hand, the current collecting tab 13b is sandwiched between the lower frame portion 202 and the middle frame portion 210 on the negative electrode forming surface, and the external current collecting lead portion 13c at the tip of the current collecting tab 13b of the negative electrode is bent downward to form the lower frame. It contacts the negative electrode take-out electrode 204b formed in the portion 202. In the second modification, the middle frame portion 210 is sandwiched so that the positive electrode and the negative electrode can be taken out and the reliability is improved.
Since other parts including the electrode structure 10 are the same as those in the first embodiment, the description thereof is omitted here. However, it is needless to say that the electrode structure is not limited to such a wound structure, and can be applied to other electrode structures such as a laminated body and a ninety-nine fold structure.

(Modification 3)
10A and 10B show a positive electrode formation surface and a negative electrode formation surface in a lithium ion capacitor of Modification 3 of the present invention. In the first and second modified examples, the structure in which the frame-like portion is horizontally divided into upper and lower parts or three parts has been described. However, as shown in FIGS. 10A and 10B, the third modified example is obliquely divided into two parts. The extraction electrode is formed on the lower frame portion on the positive electrode forming surface, the extraction electrode is formed on the upper frame portion on the negative electrode forming surface, and the external current collecting lead portion 11c at the tip of the positive current collecting tab 11b is downward. The external current collecting lead 13c at the tip of the negative current collecting tab 13b is bent upward and joined. FIG. 11 is an exploded perspective view of a power storage package structure used in the lithium ion capacitor of Modification 3 of the present invention.

In the third modification, since the joint surface is slanted, the connection position can be adjusted by the position of the current collecting tab.
Since other parts including the electrode structure 10 are the same as those in the first embodiment, the description thereof is omitted here. However, it is needless to say that the electrode structure is not limited to such a wound structure, and can be applied to other electrode structures such as a laminated body and a ninety-nine fold structure.

(Embodiment 2)
FIG. 12 is a perspective view showing the appearance of a lithium ion capacitor that is an electrochemical device according to the second embodiment of the present invention. FIGS. 13A and 13B show lithium ions according to the second embodiment of the present invention. FIG. 14 shows an exploded perspective view of the capacitor package structure of the capacitor, and FIG. 14 shows a manufacturing process of this lithium ion capacitor according to the second embodiment of the present invention.

  In the lithium ion capacitor according to the first embodiment of the present invention, the connection between the current collecting tab and the extraction electrode is made between the conductor layer formed on the outer wall of the frame-shaped portion, but in the second embodiment, The conductor layer is formed from the joint surfaces 202S and 203S to the outer wall, the connection between the current collecting tab and the extraction electrode is realized by the joint surface, and the current collecting tab is not exposed on the outer wall. (See FIG. 12). That is, as shown in FIGS. 12 and 13, the lithium ion capacitor power storage package structure 20 according to the second embodiment of the present invention forms a pair of frame-like portions facing each other through the joint surfaces 202S and 203S. A lower frame portion 202, an upper frame portion 203, a lid body that is attached to an opening of the lower frame portion 202, the upper frame portion 203, and forms a sealed structure, and the lower frame portion 202, the upper frame portion 203 And an extraction electrode 204 formed in a region extending from the joint surface to the outer wall. Therefore, the connection between the extraction electrode 204 and the current collecting tab can be made at the joint surfaces 202S and 203S. The upper frame portion 203 and the lower frame portion 202 are formed of a frame-shaped portion made of aluminum nitride, and a conductor layer pattern extending from the joint surface to the outer wall is crimped to form an extraction electrode 204.

  Then, as shown in FIG. 14, a conductor layer made of copper foil is formed on the joint surfaces 202S and 203S between the upper frame portion 203 and the lower frame portion 202 constituting the pair of frame-shaped portions, and the joint surfaces And is led out to the outer walls of the upper frame portion 203 and the lower frame portion 202 to constitute the extraction electrode 204. On the other hand, the current collecting tab is short, abuts with the extraction electrode only at the joint surface, and does not reach the outer walls of the upper frame portion 203 and the lower frame portion 202. This is a feature. Other configurations are the same as those of the first embodiment of the present invention.

(Modification 4)
Next, a modified example of the joint surface of the frame-like portion of the power storage package structure according to the embodiment of the present invention will be described. In FIG. 15, sectional drawing of the electrical storage package structure of the modification 4 of this invention is shown.
As shown in the cross section of the power storage package structure of FIG. 15, the surface of the joining surface 202S, 203S of the frame-shaped portion has a step structure from the inner side surface Si to the outer side surface So serving as the outer wall. This is different from the first and second embodiments.
According to the configuration of the fourth modification, since the surface from the inner side surface Si to the outer side surface So serving as the outer wall has a step structure in the joint surfaces 202S and 203S of the frame-shaped portion, the area of the joint surface is increased. be able to. Further, since the contact area with the current collecting tab can be increased, the connectivity with the current collecting tab (not shown here) can be improved. Further, even if a slight gap is formed, the passage is complicated and moisture is difficult to go out, so that liquid leakage can be suppressed. By using the power storage package structure according to the fourth modification, the first embodiment as well as the structure in which the current collecting tab is not exposed to the outer surface of the power storage package structure as in the electrochemical device of the second embodiment are used. Even in a structure in which the current collecting tab is also brought into contact with the outer wall of the power storage package structure, such as the electrochemical device in FIG.

(Modification 5)
Next, another modified example of the joint surface of the frame-like portion of the power storage package structure according to the embodiment of the present invention will be described. In FIG. 16, sectional drawing of the electrical storage package structure of the modification 5 of this invention is shown.
As shown in the cross section of the power storage package structure of FIG. 16, the surface from the inner side surface Si to the outer side surface So serving as the outer wall of the joint surfaces 202S and 203S of the frame-like portion has a gentle step structure. This is a difference from the fourth modification of the invention.
According to the configuration of the fifth modification example, since the joint surfaces 202S and 203S are gentler than the fourth modification example of the present invention, the conductor layer is formed on the gentle joint surface. Cutting can be prevented. Further, the electrical connectivity is good, and the area of the joint surface can be increased. Further, since the contact area with the current collecting tab can be increased, the connectivity with the current collecting tab (not shown here) can be improved. Furthermore, good bonding can be obtained.

(Modification 6)
Next, another modified example of the joint surface of the frame-like portion of the power storage package structure according to the embodiment of the present invention will be described. In FIG. 17, sectional drawing of the electrical storage package structure of the modification 6 of this invention is shown.
As shown in the cross section of the electricity storage package structure of FIG. 17, the surface of the joining surface 202S, 203S of the frame-shaped portion has an inclined structure from the inner side surface Si to the outer side surface So that becomes the outer wall. This is a point different from Modifications 4 and 5.
According to the configuration of the sixth modification, since the joining surface is smoother than that of the fifth modification of the present invention, the conductor layer is formed on the gentle joining surface. Can be prevented. Further, the electrical connectivity is good, the area of the joint surface can be increased, and the connectivity with the current collecting tab (not shown here) can be enhanced. Furthermore, good bonding can be obtained.

(Modification 7)
Next, a modified example of the electrode structure of the power storage package structure according to the embodiment of the present invention will be described. In FIG. 19, sectional drawing of the electrical storage package structure of the modification 7 of this invention is shown. FIG. 18 is a view showing the electrode structure described in the first embodiment and the modification for comparison.
In the modification of the above embodiment, an example in which the electrode structure has a ninety-nine fold structure as shown in FIG. 18 has been described. However, in the seventh modification, a fold structure is used as shown in FIG. Is also effective.
The positive electrode plate and the negative electrode plate constituting the positive electrode and the negative electrode are the same as in Embodiments 1 and 2 of the present invention, and 11b and 13b are current collecting tabs.

(Embodiment 3)
With reference to FIG. 20 thru | or FIG. 22, the electrical storage module (electrochemical module) of Embodiment 3 of this invention is demonstrated. Here, the storage module refers to a module in which an external current collection package 300 is attached to a lithium ion capacitor 100 as an electrochemical device to facilitate external connection. FIG. 20 is a perspective view showing a power storage module according to Embodiment 3 of the present invention.
FIG. 21 shows components of the power storage module according to Embodiment 3 of the present invention, (a) is a perspective view showing a single cell of a lithium ion capacitor 100 as an electrochemical device, and (b) shows an external current collection package 300. It is a perspective view shown. FIG. 22 is a diagram illustrating an assembly process of the power storage module according to the third embodiment of the present invention. In the third embodiment, a single cell of an lithium ion capacitor 100 that is an electrochemical device and an external current collection package 300 are prepared, and an extraction electrode 204 of the lithium ion capacitor 100 is attached to the external current collection package 300, The power storage module can be easily connected. Here, an electric plug 320 is used as a connector portion for external connection. Therefore, external connection is easy.

  The external current collection package 300 according to the third embodiment is formed of a frame-like body and constitutes a current collection frame having a current collection function. As shown in FIG. 21B, a main body 301 made of a resin current collecting frame, a positive current collecting spring 311 and a negative current collecting spring 313 formed on the inner wall, and an electric plug 320 for external connection are provided. It has. This electric plug is electrically connected to the positive current collecting spring 311 and the negative current collecting spring 313 in the main body 301.

  Then, as shown in FIG. 22, the single cell of the lithium ion capacitor 100 is attached to the external current collection package 300, and the power storage module shown in FIG. 20 is completed. Since the configuration of the single cell of the lithium ion capacitor 100 is the same as that of the first embodiment of the present invention, the description thereof is omitted here.

  According to the configuration of the third embodiment, the external current collecting package can be formed very easily just by mounting, no special wiring is required, and connection work as a power storage module is performed by an electric plug as a connector portion. It can be very simple.

(Embodiment 4)
With reference to FIG. 23 thru | or FIG. 25, the laminated | stacked electrical storage module of Embodiment 4 of this invention is demonstrated.
In the fourth embodiment, four power storage modules, which are the electrochemical modules described in the third embodiment of the present invention, are stacked as a power storage module unit 500 and mounted on a module package 400 as a current collecting package. This constitutes a capacity storage module. FIG. 23 shows the stacked power storage module according to Embodiment 4 of the present invention.

  24A and 24B show constituent members of the stacked power storage module according to Embodiment 4 of the present invention. FIG. 24A is a perspective view of the power storage module unit 500, and FIG. 24B is a perspective view of the module package 400. Here, the power storage module unit 500 constitutes one cell of an electrochemical device. The module package 400 has module current collectors 431 and 433 on the inner wall, and the module current collectors 431 and 433 are led out to the outer wall of the main body 430. The electrical plug 320 as the connector portion can be easily mounted by mounting it on the module current collectors 431 and 433 formed on the inner wall of the module package 400. The module current collectors 431 and 433 constitute a socket portion that engages with the connector portion.

  As shown in FIG. 24 (b), the module package 400 according to the fourth embodiment includes a main body 430 made of a resin current collecting frame, module current collectors 431 and 433 formed on the inner wall, and a partition plate. 434. The module current collectors 431 and 433 are electrically connected to the positive current collecting spring 311 and the negative current collecting spring 313 of the external current collecting package shown in FIG. 21B through an electric plug 320 as a connector portion. Yes. Here, the partition plate 434 is used for positioning the power storage module unit 500.

FIG. 25 shows an assembly process of the stacked power storage module according to Embodiment 4 of the present invention.
As shown in FIG. 25, four power storage module units 500 according to the fourth embodiment are stacked and attached to the module package 400 to complete the stacked power storage module shown in FIG.
According to the configuration of the fourth embodiment, the external current collection package of the power storage module unit 500 can be very easily formed by simply attaching it to the module package 400 by connector connection, and no special wiring is required. Connection work between 400 and the power storage module unit 500 becomes extremely simple.

  According to the configuration of the fourth embodiment, it is possible to obtain a large-capacity electrochemical module by extremely easily stacking and connecting a plurality of power storage modules.

  In each of the above-described embodiments (including each modification), both surfaces are configured by heat sinks, but the package structure has opposite main surfaces, and at least one of the main surfaces is mounted with a heat sink. It only has to be done.

  In each of the above embodiments (including each modification), the lid is configured by a heat dissipation plate. However, for example, a heat dissipation member may be bonded to the resin lid or a film may be formed.

Furthermore, in each of the above-described embodiments (including each modification), the heat radiating plate is formed so as to protrude outward from the surface of the frame-shaped portion, but has the same outer shape as the current collecting frame. May be.
In each embodiment (including each modification), it goes without saying that the position and number of current collecting tabs can be changed as appropriate.

  Furthermore, in the embodiment (including each modification), an example using a ceramic current collecting frame has been described. However, a resin substrate is used for a current collecting portion, a metal foil such as a copper foil, a plating layer, etc. By forming the extraction electrode using the conductive thin film or thick film, it is possible to form an exterior container that is easy to shape and has high dimensional accuracy.

  Although the lithium ion capacitor has been described in the embodiment (including each modification), the present invention can be applied to a storage device as various electrochemical devices including a lithium ion secondary battery.

DESCRIPTION OF SYMBOLS 10 Electrode structure 11 Positive electrode plate 11a Main body part 11b Current collecting tab 11c External current collecting lead part 12 Separator 13 Negative electrode plate 13a Main body part 13b Current collecting tab 13c External current collecting lead part 20 Power storage package structure 100 Lithium ion capacitor 201 Heat sink (Lid)
201F Heat radiation piece 202 Lower frame portion 202S Joint surface 203 Upper frame portion 203S Joint surface 204 Extraction electrode 204a Positive electrode extraction electrode 204b Negative electrode extraction electrode 205 Inlet 206 Heat dissipation plate (lid)
207 Aluminum paste 208 Ag paste 209 Ti-Ag-Cu three-layer film 210 Middle frame portion 300 External current collection package 400 Module package 500 Power storage module unit

Claims (10)

A pair of frame-like portions opposed to each other through the joint surface;
A lid that is attached to the opening of the frame-shaped portion and forms a sealed structure;
A power storage package structure comprising: an extraction electrode formed on at least one outer wall of the pair of frame-like portions. The power storage package structure according to claim 1,
The electrical storage package structure, wherein the extraction electrode includes a conductor layer extending from the joint surface to an outer wall of the frame-like portion. The power storage package structure according to claim 1 or 2,
The power storage package structure has opposing main surfaces and four side surfaces,
A power storage package structure having an extraction electrode on each of four side surfaces. The power storage package structure according to any one of claims 1 to 3,
The power storage package structure has opposing main surfaces,
A power storage package structure in which a heat sink is mounted on at least one of the main surfaces. The power storage package structure according to claim 4,
The heat dissipation plate is a power storage package structure that is joined to the frame-shaped portion and constitutes at least one of the lids. The power storage package structure according to claim 4 or 5,
The heat dissipation plate is a power storage package structure that protrudes outward from the surface of the frame-shaped portion. The electrode plate laminated in the electricity storage package structure according to any one of claims 1 to 6 via a separator is sealed together with an electrolytic solution,
The electrochemical device, wherein the electrode plate is sandwiched between the pair of frame-like portions such that a current collecting tab derived from the electrode plate is in contact with the conductor layer. The electrochemical device according to claim 7,
The current collecting tab is an electrochemical device that is bent along the outer wall of the frame-like portion and joined to the conductor layer. The electrochemical device according to claim 7 or 8, comprising:
The extraction electrode consists of a conductor layer formed so as to reach the outer wall of the frame-shaped portion from the joint surface,
The current collecting tab is an electrochemical device bonded to the conductor layer at the bonding surface. The electrochemical device according to any one of claims 7 to 9,
An electrochemical module comprising an external current collecting package attached to the extraction electrode.

Images