JP2012119505A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device using positive and negative electrode terminals which generate no interspace even when the terminals have a large cross section.SOLUTION: A power storage device comprises: positive electrodes 81, 41 made of a positive electrode current collector 82 coated with a positive electrode material; and negative electrodes 84, 44 made of a negative electrode current collector 85 coated with a negative electrode material. The positive and negative electrodes are laminated with a plate-shaped separator 87 interposed, and housed in containers 2, 20 in a state where they are immersed in an electrolyte 9. In this power storage device, positive electrode terminals 11, 42 electrically connected to tabs 88, 48 of the positive electrodes, and negative electrode terminals 12, 43 electrically connected to tabs 89, 49 of the negative electrodes are each pulled out to the outside of the containers. A positive electrode hole 22 through which the positive electrode terminal is inserted, and a negative electrode hole 23 through which the negative electrode terminal is inserted are formed at the container. The positive electrode terminal is pulled out to the outside of the container from the positive electrode hole, and the negative electrode terminal is pulled out to the outside of the container from the negative electrode hole, and the positive electrode hole and negative electrode hole are encapsulated under pressure.

Description

  The present invention particularly relates to an electricity storage device having an exterior made of a laminate film such as a capacitor or a secondary battery.

  As shown in FIG. 10, a capacitor or a secondary battery such as a capacitor or a lithium ion secondary battery generally includes a rectangular plate-like positive electrode 81 in which a positive electrode material 83 is applied on both surfaces of a positive electrode current collector 82, and a negative electrode current collector. A rectangular flat plate-shaped negative electrode 84 in which a negative electrode material 86 is applied to both surfaces of a body 85 is laminated via a rectangular flat plate-shaped separator 87 and accommodated in an exterior body 90 made of a laminate film (Patent Document). 1).

For this laminate film, a laminate of a sheet made of synthetic resin such as perfluoroalkoxy (PFA), polypropylene (PP), polyfernin sulfide (PPS) and the like and a metal foil such as an aluminum foil is used. The electrolyte solution 9 is injected into a rectangular cylindrical outer package 90 made of the laminate film, and the inside is evacuated to thermally seal the opening.
At that time, as shown in FIG. 11, a sealing tape 94 is wound around the positive electrode terminal 91 electrically connected to the tab 88 of the positive electrode 81 via the welded portion 93 and the like, and the welded portion 93 is wound around the tab 89 of the negative electrode 84. The sealing tape 94 is also wound around the negative electrode terminal 92 electrically connected through the like, and the inside is hermetically sealed by vacuum sealing as described above.

  However, when the positive electrode terminal 91 and the negative electrode terminal 92 are formed in a thin plate shape, even if the hermeticity in the exterior body 90 is ensured by winding the sealing tape 94 as described above, the terminals 92 and 93 are used. 12 is formed in a thick plate shape, or in another shape such as a columnar shape, even if this sealing tape 94 is wound, a gap 99 is formed around the terminals 91 and 92 as shown in FIG. Will occur and the airtightness in the exterior body 90 cannot be secured.

  In addition, when the positive electrode terminal 91 and the negative electrode terminal 92 are formed in a thin plate shape, the cross-sectional area is reduced, so that the electrical resistance is increased. The thin plate-like terminals 91 and 92 are used for capacitors, lithium ion secondary batteries, and the like. There is a problem that it is not suitable for a large power storage device.

  Further, when the tabs 88 of the positive electrode 81 and the tabs 89 of the negative electrode 84 are alternately arranged on the outer side of the opposite side of the separator 87 and the outer side of the other side, the positive electrode terminal 91 and the negative electrode terminal 92 are The one side and the other side of the exterior body 90 along one side and the other side of the separator 87 are drawn to the outside of the exterior body 90, and the lead-out locations of the terminals 91 and 92 become a specific side of the exterior body 90. Since it is difficult to collect, there is a drawback that the handling of electrical wiring becomes complicated.

JP 2008-305928 A

  Therefore, even if the positive electrode terminal 91 or the negative electrode terminal 92 having a large cross-sectional area is used, the terminals 91 and 92 are arranged so that the terminals 91 and 92 do not cause a gap, and more preferably, the electrical wiring can be easily handled. It is an object of the present invention to provide a stored electricity storage device.

  That is, according to the first aspect of the present invention, a positive electrode obtained by applying a positive electrode material to a positive electrode current collector and a negative electrode obtained by applying a negative electrode material to a negative electrode current collector are laminated in a container via a plate-like separator. The electrode element is housed in a state immersed in an electrolyte solution, and the uncoated portions of the positive electrode and the negative electrode are tabs, and the positive electrode terminal and the negative electrode terminal electrically connected to each of the tabs are respectively An electricity storage device drawn out of the container, wherein the container has a positive hole through which the positive terminal is inserted and a negative hole through which the negative terminal is inserted, and is airtight except for the positive hole and the negative hole. The positive electrode terminal is inserted through the positive electrode hole and drawn out of the container, and the negative electrode terminal is inserted through the negative electrode hole and drawn out of the container. The negative electrode hole is pressurized And it is characterized in that it is sealed.

  Further, according to a second aspect of the present invention, in the electricity storage device according to the first aspect, the container has a substantially rectangular shape in plan view, and the positive electrode hole and the negative electrode hole are spaced along the outer periphery thereof. The positive electrode tab and the negative electrode tab are arranged outside the opposing sides of the electrode element, and a positive electrode terminal electrically connected to the positive electrode tab is connected to the positive electrode tab. The negative electrode terminal is drawn out to the outside of the container through the hole, and the negative electrode terminal electrically connected to the negative electrode tab is drawn out to the outside of the container through the negative electrode hole.

  According to a third aspect of the present invention, in the electricity storage device according to the first or second aspect, each of the positive electrode terminal and the negative electrode terminal has a size corresponding to the thickness of the electrode element. It is arranged along the side.

  Here, having a size corresponding to the stacking thickness means that the positive electrode and the negative electrode are equivalent to the thickness of the stacking portion stacked via the separator or may be slightly thicker or thinner than the thickness of the stacking portion. It means that the thickness is different from the thickness of the terminal portion due to the difference in thickness between the terminal portion and the terminal portion.

  Invention of Claim 4 is an electrical storage device in any one of Claims 1-3, The said container is planar view substantially rectangular shape, Comprising: The said positive electrode hole and the said negative electrode hole along the outer periphery And at least a part of the positive electrode terminal extends in the thickness direction of the electrode element, and the extension part is drawn out of the container through the positive electrode hole. The negative electrode terminal is characterized in that at least a part thereof extends in the thickness direction of the electrode element, and the extended portion is drawn out of the container through the negative electrode hole.

  Invention of Claim 5 is an electrical storage device as described in any one of Claim 1 thru | or 4. WHEREIN: The said container is a laminate container which consists of a laminate film by which resin was coated on the front and back of aluminum foil. It is characterized by.

  The invention according to claim 6 is the electricity storage device according to claim 5, wherein the laminate container includes the positive electrode hole, the negative electrode hole, and the negative electrode hole along a bent line at a central portion in the longitudinal direction of the substantially rectangular laminate film. Are formed at intervals, the laminate film is bent along the bending line, and the outer peripheral portion excluding the bent portion is heat sealed or adhesively sealed, thereby forming the positive electrode hole and the negative electrode hole. Except that the positive electrode hole and the negative electrode hole are pressure sealed, and between the positive electrode terminal and the positive electrode hole, and between the negative electrode terminal and the negative electrode hole. Each is characterized in that an insulating layer is interposed.

  The invention according to claim 7 is the electricity storage device according to claim 5 or 6, wherein the laminate container has a positive electrode insertion port through which the positive electrode terminal is inserted at a position corresponding to the positive electrode hole. A plate-like or block-like external terminal fixing body having a negative electrode insertion port through which the negative electrode terminal is inserted is disposed at a corresponding position, the positive hole of the laminate container, the positive electrode insertion port of the external terminal fixing body, and the laminate The negative electrode hole of the container and the negative electrode insertion port of the external terminal fixing body are pressure-sealed.

  The invention according to claim 8 is the electricity storage device according to any one of claims 5 to 7, wherein the laminate container is housed in a hard case having the external terminal fixing body as a lid. Is.

  The invention according to claim 9 is the electricity storage device according to claim 8, wherein the hard case has a part or the whole of the side surface arranged in the thickness direction of the electrode element opened. To do.

  According to a tenth aspect of the present invention, in the electricity storage device according to the fourth aspect, the positive electrode terminal and the negative electrode terminal are made of a metal material, and are disposed on the distal end surface of the extension portion outside the extension portion. A convex portion having a small legal dimension is integrally formed, and the tip surface of the extending portion inserted into the positive hole or the negative hole formed in the container is crimped toward the container side. The positive electrode hole and the negative electrode hole are pressure-sealed.

  Further, the invention according to claim 11 is the electricity storage device according to claim 10, wherein the periphery of the positive electrode hole and the negative electrode hole is inserted into the extension portion with the container interposed therebetween, and the caulking is performed. The external terminal plate is sealed by a gasket pressed by the tip end surface of the extension portion, and the projection is inserted into a hole formed in the end portion of the external terminal plate so that the tip end surface of the projection portion is added. It is fixed by being fastened.

According to the electricity storage device according to any one of claims 1 to 11, by positively sealing the positive electrode hole of the container through which the positive electrode terminal is inserted and the negative electrode hole of the container through which the negative electrode terminal is inserted, the positive electrode of the container Airtightness can be ensured without generating a gap around the terminal or the negative electrode terminal. Note that the pressure sealing is performed by a method of tightening with a screw or, as shown in claim 10 or 11, by using the extended portion from the container of the positive electrode terminal or the negative electrode terminal as a rivet. A fastening method or the like can be employed.
In particular, even when a positive electrode terminal or a negative electrode terminal having a large cross-sectional area is used, no gap is generated. Therefore, the electric resistance can be reduced and the capacitor can be used for a high power capacitor or a lithium ion secondary battery.

Furthermore, the degree of freedom of the shape of the positive electrode terminal and the negative electrode terminal can be obtained by adopting a structure in which the positive electrode hole and the negative electrode hole formed in the container are sealed under pressure.
Therefore, for example, by arranging the positive electrode tab and the negative electrode tab outside the outer periphery of the separator, the positive electrode terminal and the negative electrode terminal that are electrically connected to the negative electrode tab and the negative electrode tab are respectively viewed in plan view. It can be pulled out of the container through a positive hole and a negative hole formed at regular intervals along the outer periphery of the rectangular container.

In addition, as in the electric storage device according to claim 2, the positive electrode terminal electrically connected to the positive electrode tab and the negative electrode tab disposed on the outer side of the opposite side of the separator and the outer side of the other side. And the negative electrode terminal can be drawn out of the container through positive and negative electrode holes formed at regular intervals along the outer periphery of the rectangular container in plan view.
As a result, since electricity flows from one side of the opposite side of the separator to the other side, the electrical efficiency can be increased, and the positive terminal and the negative terminal are arranged on the outer periphery of the container. Can be performed easily.

  Further, the positive electrode terminal and the negative electrode terminal described above are sized so as to correspond to the lamination thickness in which the positive electrode and the negative electrode are laminated via the separator as in the electricity storage device according to claim 3, Alternatively, by arranging along the other side, for example, when the inside of the container is evacuated, the stress acts on the terminal, so that the stress can be prevented from acting on the laminated portion of the positive electrode and the negative electrode.

  Further, as in the electricity storage device according to claim 4, the positive electrode terminal and the negative electrode terminal are extended at least partially in the plate thickness direction of the separator, and the extended portion is an outer periphery of the rectangular container in plan view. It is also possible to draw out the outside of the container through a positive hole and a negative hole formed at regular intervals along the hole. For this reason, even when the thickness of the laminated part in which the positive electrode and the negative electrode are laminated via the separator is thin, the cross-sectional area of the terminal can be increased by increasing the diameter of the positive electrode hole and the negative electrode hole. It is possible to prevent an external force from acting on the laminated portion due to a step between the terminal and the like. As a result, not only can the electrical wiring be handled easily as described above, but the terminal can have a desired cross-sectional shape corresponding to the type of the electricity storage device regardless of the thickness of the stacked portion.

  In addition, as in the electricity storage device according to claim 5, by using a laminate container made of a laminate film in which a resin is coated on an aluminum foil, the positive electrode hole and the negative electrode hole are pressure sealed as described above. By doing so, the airtightness of the container can be surely ensured.

  And this lamination container is like the electrical storage device of Claim 6, By forming a positive electrode hole and a negative electrode hole at intervals along the bending line of the longitudinal direction center part of a rectangular laminate film, Unlike the case of forming a positive hole and a negative hole around the inner periphery of the outer peripheral part to be heat sealed or adhesively sealed, the laminate film is damaged by an external force acting between the sealed part and the inner periphery. Etc. can be prevented.

  Further, by interposing an insulating layer between the positive electrode terminal and the positive electrode hole and between the negative electrode terminal and the negative electrode hole, it is possible to prevent a short circuit between the laminate container and the terminal.

  Furthermore, the positive electrode terminal and the negative electrode terminal can be stably fixed by disposing a plate-shaped or block-shaped external terminal fixing body in the laminate container as in the electricity storage device according to claim 7. Moreover, the airtightness of the laminate container can be more reliably ensured through the positive hole and the negative hole.

  In addition to this, according to the electricity storage device of claim 8, even when a plurality of electricity storage devices are stacked and used by housing the laminate container in a hard case having the external terminal fixing body as a lid, Problems caused by the load of the power storage device acting on the power storage device in the lower part of the stack can be reduced.

  Furthermore, this hard case can promote heat dissipation by opening part or all of the side surfaces as in the electricity storage device according to claim 9, and can reduce problems of the electricity storage device due to heat storage.

It is a longitudinal cross-sectional schematic diagram of the capacitor of 1st Embodiment of this invention. It is a cross-sectional schematic diagram of the capacitor of 1st Embodiment, (a) is the 2nd example of terminal shape, (b) is the 3rd example of terminal shape, (c) is the 4th example of terminal shape, (d ) Is an explanatory diagram illustrating a fifth example of a terminal shape. It is a partial enlarged view of the capacitor of the first embodiment, and is an explanatory view for explaining a sixth example of a terminal form. It is a longitudinal cross-sectional schematic diagram of the capacitor of 2nd Embodiment. It is a top view of the capacitor of a 3rd embodiment. It is a principal part cross-sectional schematic diagram for demonstrating the assembly method of the capacitor of 3rd Embodiment. The positive electrode terminal or negative electrode terminal used for 4th Embodiment which applied 3rd Embodiment is shown, (a) is a top view, (b) is a front view. It is a principal part cross-sectional schematic diagram for demonstrating the assembly method of the capacitor of 4th Embodiment. It is a perspective view at the time of accommodating the capacitor of 1st-3rd embodiment in a hard case, (a) And (b) is a perspective view at the time of accommodating the capacitor of 1st Embodiment and 2nd Embodiment in a hard case. It is a figure and (c) is a perspective view at the time of accommodating the capacitor of 3rd Embodiment in the hard case. It is a longitudinal cross-sectional schematic diagram of the conventional electrical storage device. It is a principal part enlarged view of the conventional electrical storage device. It is an a direction arrow directional view of FIG.

  Hereinafter, first to third embodiments of a capacitor according to the present invention will be described. In addition, about the structure same as the conventional capacitor and a secondary battery, description is simplified by using the same code | symbol.

  The capacitor according to the first embodiment includes a plurality of rectangular flat plate-like positive electrodes 81 in which a positive electrode material 83 is applied on both surfaces of a positive electrode current collector 82 and a rectangular shape in which a negative electrode material 86 is applied on both surfaces of a negative electrode current collector 85. A plurality of flat plate-like negative electrodes 84 are alternately stacked via rectangular flat plate-like separators 87 between each other. And as shown in FIG. 1, while being accommodated in the lamination container 2 of the exterior body which consists of a laminate film, the electrolyte solution 9 is inject | poured in this lamination container 2, and it is comprised roughly.

  Here, the positive electrode current collector 82 is a metal foil that has oxidation resistance and does not chemically elute, such as nickel foil or aluminum foil having a thickness of 25 μm to 35 μm (50 mm to 150 mm) × (50 mm to 150 mm), a connecting tongue (tab) 88 is integrally formed at one end in the longitudinal direction when the punching process is performed. A positive electrode material 83 made of a carbon material made of activated carbon or the like is applied and formed on both surfaces of the current collector 82.

On the other hand, the negative electrode current collector 85 was formed by punching a copper foil having a thickness of 12 to 16 μm into a rectangle of (50 mm to 150 mm) × (50 mm to 150 mm) that is substantially the same shape as the positive electrode current collector 82. Similarly, when performing the punching process, a connecting tongue 89 is integrally formed at the other end of the positive electrode current collector 82 in the longitudinal direction opposite to the connecting tongue 88. Lithium metal (not shown) is affixed to at least one surface of the current collector 85, and a non-graphitizable carbon material is a main component other than the lithium metal affixed portions on both surfaces of the current collector 85. A negative electrode material 86 is applied and formed.
As this lithium metal, an elongated plate is preferably used, and is attached to the central portion in the longitudinal direction of the negative electrode current collector 85 in the width direction.

The separator 87 is made of a sheet material having liquid permeability and non-electron conductivity made of a synthetic resin such as polyethylene, polypropylene, and cellulose, and is equal to the positive electrode current collector 82 and the negative electrode current collector 85, or It is formed in a square having a larger external dimension.
Further, as the electrolytic solution 9, lithium salts such as LiBF ₄ , LiPF ₄ , LiClO ₄ , and LiAsF ₆ that are electrolytes are dissolved in a solvent and injected.

  The plurality of positive electrodes 81 are laminated with the connecting tongue portions 88 of the current collectors 82 and are electrically connected to the positive electrode terminal 11 serving as an external connection terminal by the welding portion 19. The plurality of negative electrodes 84 are laminated with the connecting tongue portions 89 of the current collectors 85 and are electrically connected to the negative electrode terminal 12 serving as an external connection terminal by the welded portion 19.

The plurality of positive electrodes 81, negative electrodes 84, and separators 87 stacked in this manner are accommodated in a laminate container 2 that is rectangular in plan view.
The laminate container 2 is made of a rectangular laminate film in which a metal foil such as a metal foil such as an aluminum foil is laminated on an insulating sheet made of synthetic resin such as polypropylene. Then, a positive hole 22 through which the positive terminal 11 is inserted and a negative hole 23 through which the negative terminal 12 is inserted are formed on the bending line 21 at the center in the longitudinal direction of the laminate film at an interval along the bending line 21. The outer peripheral portion 24 excluding the bent portion is bent and bonded and sealed with heat sealing or epoxy resin.

  On the other hand, each of the positive electrode terminal 11 and the negative electrode terminal 12 is a metal rod having a flange portion 13 that comes into contact with the bending line 21 of the laminate film, and the flange portion 13 has a larger diameter than the positive electrode hole 22 and the negative electrode hole 23. It is formed in a disk shape. In addition, the positive terminal 11 and the negative terminal 12 both have an inner terminal portion on one end side where the connecting tongues 88 and 89 are welded in the container 2 with the flange portion 13 as a boundary, and are formed in a rectangular column shape. The external terminal portion on the other end side drawn out of the container 2 is formed in a columnar shape, and a screw is cut in the external terminal portion.

  Further, a thick plate-like external terminal fixing body 3 is disposed in accordance with the bending line 21 of the laminate container 2, and the external terminal fixing body 3 is connected to the positive electrode insertion port through which the positive electrode terminal 11 is inserted at a position corresponding to the positive electrode hole 22. 32 is formed, and a negative electrode insertion port 33 through which the negative electrode terminal 12 is inserted is formed at a position corresponding to the negative electrode hole 23.

  As a result, the positive terminal 11 has the inner terminal portion disposed along one side of the separator 87, the flange portion 13 abuts around the positive hole 22, and the outer terminal portion passes through the positive hole 22 and the positive hole 32. In addition, an insulating layer 16 such as a resin is interposed between the positive electrode hole 22 and the positive electrode insertion port 32 extending from the periphery of the external terminal portion to the flange 13, and the external terminal portion is connected to the positive electrode hole 22 and the positive electrode insertion port. A nut 14 is fastened to the top of the head inserted through the nut 32.

  Similarly, the negative electrode terminal 12 has an internal terminal portion disposed along the other side of the opposite side of the separator 87 with respect to the positive electrode terminal 11, and the flange portion 13 abuts around the negative electrode hole 23 so that the external terminal portion is The negative electrode hole 23 and the negative electrode insertion port 33 are inserted, and an insulating layer 16 such as a resin is interposed between the negative electrode hole 23 and the negative electrode insertion port 33 extending from the periphery of the external terminal portion to the flange portion 13. A nut 14 is fastened to the top of the terminal portion where the terminal portion is inserted through the negative electrode hole 23 and the negative electrode insertion port 33.

By fastening the nut 14 to the positive electrode terminal 11 and the negative electrode terminal 12 in this way, the laminate container 2 is pressure-sealed together with the external terminal fixing body 3 to ensure the airtightness in the laminate container 2.
The positive electrode terminal 11 and the negative electrode terminal 12 may be strongly tightened by interposing a washer (not shown) between the nut 14 and the external terminal fixing body 3 as necessary. Thereby, the laminate container 2 is more reliably pressure-sealed, and the airtightness in the laminate container 2 is further increased.

Next, another embodiment of the positive electrode terminal 11 and the negative electrode terminal 12 will be described with reference to FIG.
These terminals 11 and 12 may have internal terminal portions formed in a rectangular column shape as described above, but when the thickness of the laminated portion of the positive electrode 81 and the negative electrode 84 is large, it is shown in FIG. As shown in FIG. 2B, the cross section may be formed in a substantially L shape as shown in FIG. Further, the terminals 11 and 12 can adopt any shape as shown in FIG. 2C or FIG. 2D, and thereby have a size corresponding to the stacking thickness of the stacking portion. It is preferable to arrange | position along 87 opposing sides. Accordingly, it is sufficient that the welded portion 19 is a place where electrical connection with the connecting tongues 88 and 89 is secured.

  Further, the terminals 11 and 12 are not limited to those in which the internal terminal portion, the flange portion 13 and the external terminal portion described above are integrally formed. As shown in FIG. In addition to the flange portion 13, the shaft portion may be an external terminal portion, and the bus bar 18 may be used as an internal terminal portion to be welded to the connection tongue portions 88 and 89. In other words, an L-shaped metal plate having a hole having a diameter corresponding to the shaft portion of the bolt 17 is used as the bus bar 18. The bus bar 18 is connected to the top of the bolt 17 and the bending line of the laminate container 2. You may arrange | position rotatably between 21.

Next, a second embodiment of the capacitor of this embodiment will be described.
In addition, about the structure same as 1st Embodiment, description is simplified by using the same code | symbol.

  As shown in FIG. 4, the capacitor according to the second embodiment includes a plurality of rectangular flat plate-like positive electrodes 41 in which a positive electrode material 83 is applied on both surfaces of a positive electrode current collector 82, and negative electrodes on both surfaces of a negative electrode current collector 85. A plurality of rectangular flat plate-like negative electrodes 44 coated with the material 86 are alternately stacked via rectangular flat plate separators 87 therebetween. And while being accommodated in the lamination container 2 of the exterior body which consists of a laminate film, the electrolyte solution 9 is inject | poured in this lamination container 2, and it is schematically comprised by vacuum-sealing.

  Here, the positive electrode current collector 82 is formed by punching a metal foil into a rectangle of (50 mm to 150 mm) × (50 mm to 150 mm), and when performing the punching process, the center in the longitudinal direction is formed. A rectangular connecting tongue (tab) 48 extending in the width direction is integrally formed on one end side from the portion. A positive electrode material 83 is applied and formed on both surfaces of the current collector 82.

  On the other hand, the negative electrode current collector 85 is formed by punching into a rectangular shape substantially the same as the positive electrode current collector 82. When performing the punching process, the negative electrode current collector 85 is connected to the other end side from the longitudinal center portion. A rectangular connecting tongue (tab) 49 extending in the same direction as the tongue 48 is integrally formed. As in the first embodiment, lithium metal (not shown) is attached to at least one surface of the current collector 85, and the negative electrode material 86 is provided on the both surfaces of the current collector 85 except for the lithium metal attachment location. Is formed by coating.

  As a result, the positive electrode 41 and the plurality of negative electrodes 44 are such that the connecting tongue 48 and the connecting tongue 49 are positioned on the outer side in the width direction on one end side and on the outer side in the width direction on the other end side. Is laminated. The plurality of positive electrodes 41 are laminated with the connecting tongue portions 48 of the current collectors 82 and are electrically connected to the positive terminal 42 by the welded portion 19, and the plurality of negative electrodes 44 are connected to each other. The connecting tongue portion 49 of the current collector 85 is laminated and electrically connected to the negative electrode terminal 43 by the welded portion 19.

  The plurality of positive electrodes 41, negative electrodes 44, and separators 87 stacked in this way are accommodated in the laminate container 2 in which the positive electrode holes 22 and the negative electrode holes 23 are formed. Further, a thick plate-like external terminal fixing body 3 is disposed in accordance with the bending line 21 of the laminate container 2, and the positive terminal insertion opening 32 is formed in the external terminal fixing body 3 at a position corresponding to the positive electrode hole 22. At the same time, a negative electrode insertion port 33 is formed at a position corresponding to the negative electrode hole 23.

  Further, each of the positive electrode terminal 42 and the negative electrode terminal 43 is a metal rod having a flange portion 13 that is in contact with the bending line 21 of the laminate film, and the flange portion 13 has a larger diameter than the positive electrode hole 22 and the negative electrode hole 23. It has a disk shape. In addition, the positive terminal 42 and the negative terminal 43 are each formed with a rectangular columnar inner terminal portion welded to the connecting tongue portions 48 and 49 in the container 2 with the flange portion 13 as a boundary. The external terminal portion on the other end side that is pulled out of the container 2 is formed in a cylindrical shape, and a screw is cut in the external terminal portion.

As a result, the positive terminal 42 has the flange 13 in contact with the periphery of the positive hole 22 so that the external terminal passes through the positive hole 22 and the positive hole 32 and the positive terminal extends from the periphery of the external terminal to the flange 13. The insulating layer 16 is interposed between the hole 22 and the positive electrode insertion port 32, and the nut 14 is fastened to the top portion where the external terminal portion is inserted into the positive electrode hole 22 and the positive electrode insertion port 32.
Similarly, the negative terminal 43 has the flange 13 in contact with the periphery of the negative hole 23 so that the external terminal is inserted into the negative hole 23 and the negative electrode insertion port 33, and the negative electrode extending from the periphery of the external terminal to the flange 13. The insulating layer 16 is interposed between the hole 23 and the negative electrode insertion port 33, and the nut 14 is fastened to the top portion where the external terminal portion is inserted into the negative electrode hole 23 and the negative electrode insertion port 33.

By fastening the nut 14 to the positive electrode terminal 42 and the negative electrode terminal 43 in this way, the laminate container 2 is pressure-sealed together with the external terminal fixing body 3 to ensure the airtightness in the laminate container 2.
The positive terminal 42 and the negative terminal 43 may be strongly tightened by interposing a washer (not shown) between the nut 14 and the external terminal fixing body 3 as necessary.
Similarly to the first embodiment, the terminals 42 and 43 have, as shown in FIG. 9, the top portion of the bolt 17 as the flange portion 13, the shaft portion as the external terminal portion, and the bus bar 18 as the internal terminal portion. It may be welded to the connecting tongues 48 and 49.

Next, a third embodiment of the capacitor of this embodiment will be described.
In addition, about the structure same as 1st Embodiment, description is simplified by using the same code | symbol.

  As shown in FIG. 5, the capacitor of the third embodiment is made of a laminate film made of the same material as that of the first embodiment, in which a plurality of positive electrodes 81 and a plurality of negative electrodes 84 are alternately stacked via separators 87. While being accommodated in the laminate container 20 having a rectangular shape in plan view, an electrolytic solution is injected into the laminate container 20 and vacuum sealed.

The positive terminal 51 is electrically connected to the connecting tongue 88 of the positive electrode 81 by the welded portion 19, and the negative terminal 52 is electrically connected to the connecting tongue 89 of the negative electrode 84 by the welded portion 19. Connected.
Each of the positive electrode terminal 51 and the negative electrode terminal 52 is integrally formed with a columnar external terminal portion (extension portion) 54 that extends in the thickness direction of the separator 87 at one end portion of a prismatic metal rod 53. The external terminal portion 54 is threaded.

  On the other hand, the laminate container 20 has a positive electrode hole 22 through which the external terminal portion 54 of the positive electrode terminal 11 is inserted and a negative electrode hole through which the external terminal portion 54 of the negative electrode terminal 12 is inserted along the bending line 21 at the center in the longitudinal direction of the laminate film. 23 is formed at an interval, bent along the bending line 21, and the outer peripheral portion 24 excluding the bent portion is sealed by heat sealing or epoxy resin or the like.

When assembling the capacitor of the third embodiment, first, the laminate film is bent by the bending line 21 so that the external terminal portion 54 of the positive electrode terminal 51 is inserted into the positive electrode hole 22 of the laminate film, and the negative electrode terminal 52 is inserted. The external terminal portion 54 is inserted into the negative electrode hole 23 of the laminate film. Next, as shown in FIG. 6, the positive hole 22 and the negative hole 23 of the laminate container 20 are pressure-sealed using a caulking jig 99, and the thin plate-like external terminal fixing body 30 is formed along the bending line 21. Place.
The external terminal fixing body 30 has a positive electrode insertion port 32 through which the positive electrode terminal 11 is inserted at a position corresponding to the positive electrode hole 22 and a negative electrode insertion port 33 through which the negative electrode terminal 12 is inserted at a position corresponding to the negative electrode hole 23. Is formed.

  Next, a resin adhesive is used as an insulating layer between the external terminal portion 54 of the positive electrode terminal 51 and the positive electrode hole 22 and the positive electrode insertion port 32, and the external terminal portion 54 of the negative electrode terminal 52, the negative electrode hole 23, and the negative electrode insertion port 33. And the nut 14 is fastened to the external terminal portion 54 of the positive electrode terminal 51 and the external terminal portion 54 of the negative electrode terminal 52.

Thus, also by fastening the nut 14 to the positive electrode terminal 11 and the negative electrode terminal 12, the laminate container 20 is pressure-sealed with the external terminal fixing body 30, and the airtightness in the laminate container 2 is ensured more reliably. The
The positive electrode terminal 11 and the negative electrode terminal 12 may be strongly tightened by interposing a washer (not shown) between the nut 14 and the external terminal fixing body 30 as necessary. An external terminal plate 15 having a hole having a diameter corresponding to the external terminal portion 54 may be interposed between the wiring 14 and the external terminal fixing body 30 in accordance with the wiring.

  Thereafter, as described above, the outer peripheral portion 24 of the laminate film is heat-sealed or adhesively sealed leaving the outer periphery of the bending line 21, and after vacuuming, the remaining outer peripheral periphery is heat-sealed or adhesively sealed. Stop. Thereby, the capacitor of the third embodiment is assembled.

Next, a fourth embodiment to which the third embodiment is applied will be described with reference to FIGS. Similarly, the same components as those shown in FIGS. 5 and 6 are denoted by the same reference numerals, and description thereof will be simplified.
In this electricity storage device, a positive electrode terminal 60 and a negative electrode terminal 61 are used in place of the positive electrode terminal 51 and the negative electrode terminal 52 shown in FIGS. 5 and 6. The positive electrode terminal 60 and the negative electrode terminal 61 are each a prismatic metal rod 53 welded to the connection tongue 88 or the connection tongue 89 of the negative electrode 84, and a separator formed integrally with one end of the metal rod 53. A cylindrical extension portion 62 extending in the plate thickness direction 87 and a convex portion 63 that is coaxially formed integrally with the distal end surface and has a smaller diameter than the extension portion 62.

  When assembling the capacitor of the third embodiment using the positive terminals 60 and 61 having the above-described configuration, first, as shown in FIG. 8A, the gasket 64a is attached to the root portion of the extension portion 62, After the extending portion 62 of the positive electrode terminal 60 or the negative electrode terminal 61 is inserted into the positive electrode hole 22 or the negative electrode hole 23 of the laminate film, the gasket 64b is further attached to the extending portion 62 so as to sandwich the laminate film therebetween. Next, the extension portion 62 is used as a rivet, and the end surface of the extension portion 62 is caulked with a caulking jig toward the metal rod 53 side.

Thereby, the laminate container 20 is pressure-sealed together with the gaskets 64a and 64b, and the airtightness in the laminate container 20 is more reliably ensured.
Next, as shown in FIG. 8B, the convex portion 63 is inserted into the hole formed in the external terminal plate 15, and the convex portion 63 is used as a rivet. The external terminal plate 15 is fixed by caulking the front end surface toward the extending portion 62 side.

As described above, in the electricity storage device shown in the fourth embodiment, the periphery of the positive electrode hole 22 and the negative electrode hole 23 is higher particularly in the extending portion 62 of the positive electrode terminal 60 and the negative electrode terminal 61 from the laminate container 20 to the outside. It can be pressure sealed by hermeticity.
In addition, the external terminal plate 15 can also be fixed to the convex portion 63 integrally formed with the extending portion 62 by the same caulking process as that of the extending portion. At this time, when the hole of the external terminal plate 15 is formed in a polygonal shape, the plastically deformed convex portion 63 is bitten into the corner portion of the hole by caulking using the convex portion 63 as a rivet. By this, it becomes possible to fix firmly.

The capacitors of the first and second embodiments described above may be housed in a hard case 51 having the external terminal fixing body 3 as a lid, as shown in FIG. 9A or 9B. . Further, the capacitor of the above-described third embodiment may be housed in a hard case 55 having a lid 39 that has the external terminal fixing body 30 in part as shown in FIG. The lids 3 and 39 and the hard cases 51 and 55 may be bonded with an adhesive such as an epoxy resin or may be laser bonded.
As the hard cases 51 and 55, a resin or metal case is used, preferably a propylene or aluminum case, and the side surfaces of the positive electrodes 81 and 41 and the negative electrodes 84 and 44 arranged in the plate thickness direction are used. Part or the whole surface is open.

  In addition, although it is a capacitor in the above-mentioned embodiment, this invention is not limited to the above-mentioned embodiment at all, For example, other electrical storage devices, such as a lithium ion secondary battery, may be sufficient. Moreover, in 1st Embodiment and 2nd Embodiment, the positive hole 22 and the negative hole 23 of the lamination container 2 are outside by fastening the nut 14 to the top part of the positive terminals 11 and 14 and the negative terminals 12 and 43. The positive hole 22 and the negative hole 23 of the laminate container 20 are pressure sealed by the crimping jig 99 in the third embodiment. Further, by fastening nuts to the tops of the positive terminals 11 and 14 and the negative terminals 12 and 43, the positive hole 22 and the negative hole 23 of the laminate container 2 are connected to the positive insertion hole 32 and the negative electrode of the external terminal fixing body 30. It is pressure sealed together with the insertion port 33. However, the present invention is not limited to the first to third embodiments described above. For example, even if only pressure sealing with the caulking jig 99 is performed, Pressure sealing of the negative electrode hole 23 may be used.

According to the capacitor of this embodiment, the positive holes 22 of the laminate containers 2 and 20 through which the positive terminals 11 and 42 are inserted and the negative holes 23 of the laminate containers 2 and 20 through which the negative terminals 12 and 43 are inserted are sealed under pressure. By stopping, airtightness can be ensured without generating a gap around the positive electrode terminals 11 and 42 and the negative electrode terminals 12 and 32 of the laminate containers 2 and 20.
In particular, since a gap does not occur even when a metal rod having a large cross-sectional area is used for the positive electrode terminals 11 and 42 and the negative electrode terminals 12 and 32, the electric resistance is reduced, and a high power capacitor, a lithium ion secondary battery, etc. Can also be used.

Further, by adopting a structure in which the positive electrode hole 22 and the negative electrode hole 23 formed in the laminate containers 2 and 20 are pressure-sealed in this way, the degree of freedom of the shape of the positive electrode terminals 11 and 42 and the negative electrode terminals 12 and 32 is increased. Is obtained.
Therefore, for example, like the capacitor of the second embodiment, the positive electrode terminal 42 is connected to the rectangular connecting tongue 48 extending in the width direction from the center in the longitudinal direction of the positive electrode current collector 82 to the one end side. The negative electrode terminal 43 is connected to a rectangular connecting tongue 49 extending in the width direction from the longitudinal central portion of the electric body 85 to the other end side, and the positive electrode terminal 42 and the negative electrode terminal 43 are connected to the laminate container 2. Can be pulled out of the laminate container 2 through a positive hole 22 and a negative hole 23 formed on the bent line 21 at a predetermined interval.

  In addition, like the capacitor of the first embodiment, a connecting tongue 88 is integrally formed at one end in the longitudinal direction of the positive electrode current collector 82, and the other end in the longitudinal direction of the negative electrode current collector 85. By forming the connecting tongue portion 89 integrally therewith, the connecting tongue portion 88 and the connecting tongue portion 89 can be arranged on the outer side of the opposite side of the separator 87 and the outer side of the other side. Then, the positive electrode terminal 11 electrically connected to the connecting tongue portion 88 and the negative electrode terminal 12 electrically connected to the connection tongue portion 89 are arranged on one side of the opposing side of the separator 87. Further, the positive electrode hole 22 and the negative electrode hole 23 which are arranged along the bending line 21 of the laminate container 2 and spaced apart from each other can be drawn out to the outside of the laminate container 2.

  Therefore, according to the capacitors of the first embodiment and the second embodiment, the positive terminals 11 and 42 and the negative terminals 12 and 43 are arranged on the bending line 21 of the laminate container 2, so that the electrical wiring is routed. Can be performed easily. Further, the terminals 11 and 12 in the capacitors of the first and second embodiments are configured such that the flange portion 13 and the external terminal portion are constituted by bolts 17, and the shaft portion of the bolt 17 is the external terminal portion and the head of the bolt 17. An external force is applied to the external terminal portion by configuring the top portion as the flange portion 13 and the internal terminal portion by the bus bar 18 made of an L-shaped metal plate having a hole having a diameter corresponding to the shaft portion of the bolt 17. Even in this case, it is possible to prevent the capacitor from being broken by acting on the internal terminal portion.

In particular, according to the capacitor of the first embodiment, since electricity flows from one side of the opposite side of the separator 87 to the other side, not only can the electric efficiency be improved, but also the electrode 87 is attached to the negative electrode current collector 85. The lithium metal pre-doping time can be shortened.
Further, in the capacitor according to the first embodiment, the positive electrode terminal 11 and the negative electrode terminal 12 are sized to correspond to the lamination thickness of the laminated portion of the positive electrode 81 and the negative electrode 84, and as described above, Since the stress acts on the terminals 11 and 12 even when the inside of the laminate container 2 is evacuated, the stress can be prevented from acting on the laminated portion of the positive electrode 81 and the negative electrode 84 by being disposed along the other side. .

  Further, like the capacitor of the third embodiment, as the positive electrode terminal 51 and the negative electrode terminal 52, a cylindrical external terminal portion 54 extending in the thickness direction of the separator 87 is integrally formed at one end portion of the metal rod 53. Things can be used. Then, the external terminal portion 54 can be drawn out through the holes 22 and 23 of the laminate container 20 and the insertion ports 32 and 33 of the external terminal fixing body 30. For this reason, even when the thickness of the laminated portion in which the positive electrode 81 and the negative electrode 84 are laminated via the separator 87 is thin, if the diameters of the holes 22 and 23 and the insertion ports 32 and 33 are increased, the terminals 51 and 52 are disconnected. Not only can the area be increased, but it is also possible to prevent an external force from acting on the laminated portion due to a step formed between the laminated portion and the terminals 51 and 52. As a result, it is possible not only to easily handle the electrical wiring as described above, but also to have the terminals 51 and 52 having a desired cross-sectional shape corresponding to the type of the power storage device regardless of the thickness of the stacked portion. it can.

  In addition, according to the capacitors of the first to third embodiments, the insulating layer 16 is interposed between the positive terminals 11 and 42 and the positive hole 22 and between the negative terminals 12 and 32 and the negative hole 23. Therefore, it is possible to prevent a short circuit between the laminate containers 2 and 20 and the terminals 11, 42, 12, and 32.

  Furthermore, by arranging the external terminal fixing body 3 in the laminating containers 2 and 20, the positive terminals 11 and 42 and the negative terminals 12 and 32 can be stably fixed, and the laminating containers 2 and 20 The airtightness of the can be ensured more reliably. Further, when a metal member is used as the external terminal fixing body 3, an external terminal is provided by interposing the insulating layer 16 between the terminals 11, 42, 12, 32 and the insertion openings 32, 33. It is possible to prevent a short circuit between the fixed body 3 and the terminals 11, 42, 12, and 32.

  In addition to this, a plurality of capacitors are stacked and used by housing the laminate containers 2 and 20 in the hard cases 51 and 55 having the external terminal fixing body 3 and a part thereof having the lids 3 and 39 as the lids 3 and 39. Even in this case, it is possible to reduce problems caused by the load of the capacitor in the upper part of the multilayer acting on the capacitor in the lower part of the multilayer.

  At this time, after the pre-doping of the lithium metal is completed, the laminate containers 2 and 20 are accommodated in the hard cases 51 and 55, so that the size of the hard cases 51 and 55 is not increased more than necessary, and a plurality of capacitors are obtained. It is possible to prevent the assembled battery in which the layers are stacked from becoming large. In addition, since battery elements such as the positive electrodes 81 and 41, the negative electrodes 84 and 44, and the electrolyte solution 9 are accommodated in the laminate containers 2 and 20, and placed in the hard cases 51 and 55, the hard case 51, There is no risk of corrosion of 55, and a part of or the entire side surface can be opened. As a result, heat dissipation can be promoted and defects of the capacitor due to heat storage can be reduced.

  It can be used for an electricity storage device having an exterior made of a laminate film such as a secondary battery such as a capacitor or a lithium ion secondary battery.

11, 42, 60 Positive terminal 12, 43, 61 Negative terminal 13 Collar of terminal 11, 12, 42, 43 2, 20 Laminate container 21 Bending line of laminate container 2, 20 22 Laminate container 2, 20 formed Positive electrode hole 23 Negative electrode hole 3, 30 formed in laminate container 2, 20 External terminal fixing body 51, 55 Hard case 41, 81 Positive electrode 44, 84 Negative electrode 87 Separator 48, 88 Positive electrode connection tongue (positive electrode tab)
49, 49 Negative electrode connection tongue (negative electrode tab)
62 Extension part 63 Convex part 64a, 64b Gasket 9 Electrolyte

Claims (11)

An electrode element in which a positive electrode in which a positive electrode material was applied to a positive electrode current collector and a negative electrode in which a negative electrode material was applied to a negative electrode current collector was laminated via a plate-shaped separator was immersed in the container. In the electric storage device, the uncoated portions of the positive electrode and the negative electrode are tabbed, and the positive electrode terminal and the negative electrode terminal electrically connected to each of the tabs are respectively drawn out of the container. And
The container has a positive hole through which the positive terminal is inserted and a negative hole through which the negative terminal is inserted, and is formed airtight except for the positive hole and the negative hole, and the positive terminal is the positive hole. And the negative electrode terminal is inserted through the negative electrode hole and drawn out of the container, and the positive electrode hole and the negative electrode hole are pressure-sealed. An electricity storage device characterized by the above.   The container has a substantially rectangular shape in plan view, and the positive electrode hole and the negative electrode hole are formed at intervals along the outer periphery thereof, and the positive electrode tab and the negative electrode tab are: A positive electrode terminal, which is disposed outside the opposing side of each of the electrode elements and is electrically connected to the positive electrode tab, is drawn out of the container through the positive electrode hole and electrically connected to the negative electrode tab. The electrical storage device according to claim 1, wherein the negative electrode terminal is pulled out to the outside of the container through the negative electrode hole.   The said positive electrode terminal and the said negative electrode terminal have a magnitude | size corresponding to the thickness of the said electrode element, respectively, and are arrange | positioned along the edge | side of the said electrode element. Power storage device.   The container has a substantially rectangular shape in plan view, and the positive electrode hole and the negative electrode hole are formed with an interval along the outer periphery thereof, and at least a part of the positive electrode terminal is the electrode element. The extension portion is extended to the outside of the container through the positive electrode hole, and at least a part of the negative electrode terminal extends in the thickness direction of the electrode element. The electricity storage device according to any one of claims 1 to 3, wherein a protruding portion is drawn to the outside of the container through the negative electrode hole.   The power storage device according to any one of claims 1 to 4, wherein the container is a laminate container made of a laminate film in which a resin is coated on the front and back surfaces of an aluminum foil.   The laminate container is formed such that the positive electrode hole and the negative electrode hole are spaced from each other along a bending line at a central portion in the longitudinal direction of the substantially rectangular laminate film, and the laminate film is bent along the bending line. The outer peripheral portion excluding the bent portion is heat-sealed or adhesively sealed, and is formed airtight except for the positive electrode hole and the negative electrode hole, and the positive electrode hole and the negative electrode hole The insulating layer is interposed between the positive electrode terminal and the positive electrode hole and between the negative electrode terminal and the negative electrode hole, respectively. Power storage device.   A plate-like or block-like shape having a positive electrode insertion port through which the positive electrode terminal is inserted at a position corresponding to the positive electrode hole of the laminate container and a negative electrode insertion port through which the negative electrode terminal is inserted at a position corresponding to the negative electrode hole. An external terminal fixing body is disposed, and the positive electrode hole of the laminate container and the positive electrode insertion port of the external terminal fixing body, and the negative electrode hole of the laminate container and the negative electrode insertion port of the external terminal fixing body are pressure sealed. The power storage device according to claim 5, wherein the power storage device is provided.   The electricity storage device according to any one of claims 5 to 7, wherein the laminate container is accommodated in a hard case having the external terminal fixed body as a lid.   9. The electricity storage device according to claim 8, wherein the hard case has a part or the whole of the side surface arranged in the thickness direction of the electrode element opened.   The positive electrode terminal and the negative electrode terminal are made of a metal material, and a convex portion having a smaller outer dimension than the extension portion is integrally formed on the distal end surface of the extension portion, and is formed in the container. Further, the positive electrode hole and the negative electrode hole are pressure-sealed by crimping the front end surface of the extending portion inserted through the positive electrode hole or the negative electrode hole toward the container side. The electricity storage device according to claim 4.   The periphery of the positive electrode hole and the negative electrode hole is inserted into the extension part with the container in between, and sealed by a gasket pressed by the tip surface of the extension part by the caulking, 11. The electric storage device according to claim 10, wherein the external terminal plate is fixed by inserting the convex portion into a hole formed at an end thereof and crimping a tip end surface of the convex portion. .

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