JP2010016307A - Module type energy storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a module type energy storage device for suppressing an internal temperature increase to improve performance by improving heat radiation properties. <P>SOLUTION: A module type energy storage device has a plurality of energy storage devices. The energy storage device includes: a laminated cell, namely a laminate of a unit cell impregnated with an electrolyte solution while a first active layer, an insulating layer, and a second active layer are arranged in this order; first and second flat plates that cover one surface and the other surface in the lamination direction of the laminated cell, clamp the laminated cell, and are connected to positive and negative electrodes of the respective unit cells so that the respective unit cells are connected in parallel; and a surrounding section for surrounding a side in the lamination direction of the laminated cell and for sealing an area between the first and second plates. The plurality of energy storage devices are stacked and the first and second plates between the energy storage devices are common. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a modular power storage device with improved heat dissipation.

  Conventionally, a power storage device such as an electric double layer capacitor capable of realizing a large capacity has been used for vehicles such as electric vehicles.

In a power storage device such as a general electric double layer capacitor, an electrode made of an active material is overlapped with a separator and wound or laminated, and is bound together with an electrolyte solution with a resin, insulating paper, or the like. The wound electrode or the laminated electrode in the bound state is sealed in an aluminum casing, and only the terminal for taking out the electric charge obtained by binding a plurality of pairs of positive and negative electrodes is exposed to the outside. The charge extraction terminal is a terminal for connecting to an external load via a conducting wire, and has a minimum necessary size for connecting the conducting wire (see, for example, Patent Document 1).
JP-A-10-125559

  In such a power storage device, if high-rate charge / discharge is performed in which discharge or charging is performed with a large current instantaneously, a large amount of heat is generated in the internal electrode and its surroundings. However, the internal electrode is not provided with a heat dissipation mechanism, and the resin or insulating paper that seals the internal electrode has low thermal conductivity, and the heat generated in the internal electrode is trapped inside the housing. As the temperature rises, the electrolyte solution and the electrode deteriorate, and this may cause performance deterioration such as a decrease in capacitance and an increase in internal resistance.

  As a countermeasure, generally, the capacitor body is cooled by a powerful cooling device, or the capacitor is used at the maximum capacity or less by limiting the input / output power. In such a power storage device, in order to reduce the necessity of cooling from the viewpoint of energy saving and to sufficiently bring out the performance, it is necessary to suppress a temperature rise due to heat generation from the active material inside the capacitor.

  Such suppression of temperature rise has been a more serious problem when a plurality of power storage devices are modularized to form a modular capacitor.

  Therefore, an object of the present invention is to provide a module type power storage device that improves heat dissipation and suppresses temperature rise inside to improve performance.

  The module type power storage device of one aspect of the present invention includes a unit cell in which a first active layer, an insulating layer, and a second active layer are arranged in this order between a positive electrode and a negative electrode, and impregnated with an electrolyte solution. The unit cell, which is a stacked body, covers the one side and the other side in the stacking direction of the layered cell, sandwiches the layered cell, and is connected in parallel to the unit cells. The flat plate-like first plate and the second plate to which the positive electrode and the negative electrode of the cell are respectively connected, and the side in the stacking direction of the stacked cell are enclosed, and the space between the first plate and the second plate is sealed A plurality of power storage devices including a surrounding portion, wherein the plurality of power storage devices are stacked, and the first plate or the second plate between the power storage devices adjacent to each other in the stacking direction is common.

  The plurality of power storage devices may be electrically connected in series.

  Further, in plan view, the first plate and the second plate may be pulled out in different directions.

  Further, in plan view, the first plate and the second plate may be pulled out in the same direction.

  In addition, a flow path for allowing cooling water to flow may be formed outside the surrounding portion between the first plate and the second plate.

  Further, the surrounding portion may be a rectangular annular side wall in a plan view that seals between the first plate and the second plate.

  According to the present invention, by improving the heat dissipation, it is possible to provide a specific effect that it is possible to provide a module type capacitor in which the temperature rise inside is suppressed and the performance is improved.

  Embodiments to which the module type power storage device of the present invention is applied will be described below. Here, a module type capacitor will be described as an example of a module type power storage device.

  1A and 1B are diagrams showing an electric double layer capacitor included in a module type capacitor according to an embodiment. FIG. 1A is a cross-sectional view seen from the front direction, and FIG. 1B is a perspective view schematically showing a configuration of a main part. FIG.

  As shown in FIGS. 1A and 1B, the electric double layer capacitor 1 included in the module type capacitor of the present embodiment has a pair of flat terminals 10A and 10B. The flat terminals 10A and 10B are, for example, aluminum flat terminals having a length (length in the left-right direction in the drawing) of 200 mm, a width (length in a direction passing through the drawing) of 200 mm, and a thickness of about 1 mm. The active layer 11 is formed on one surface (the lower surface of the flat terminal 10A and the upper surface of the flat terminal 10B in the drawing). Note that the upper surface of the flat terminal 10 </ b> A and the lower surface of the flat terminal 10 </ b> B form an exterior surface of the electric double layer capacitor 1.

  In the flat terminals 10A and 10B, the flat terminal 10A serves as a positive terminal of the electric double layer capacitor 1 and the flat terminal 10B serves as a negative terminal, and receives an external power supply for charging (not shown) and power supply from the electric double layer capacitor 1. A load is connected. The external power source and the load may be separate.For example, when connecting a motor generator capable of both regenerative operation for generating electric power and powering operation for consuming electric power to the flat terminals 10A and 10B, The external power supply and the load are integrated. The electric double layer capacitor 1 of the present embodiment can also be connected to such a motor generator.

  Between the flat terminals 10A and 10B, a plurality of current collecting electrodes 12 each having an active layer 11 on both surfaces are laminated via an insulating layer. The current collecting electrode 12 is an extremely thin sheet-like electrode made of aluminum and has, for example, a length of 150 mm, a width of 150 mm, and a thickness of about 30 μm. Moreover, the active layer 11 formed or stuck on both surfaces of the current collecting electrode 12 is made of activated carbon having a thickness of about 100 μm, for example.

  Each collector electrode 12 is connected to the flat terminals 10 </ b> A and 10 </ b> B alternately via the tabs 13 in the stacking direction. FIG. 1A shows a mode in which the tab 13 is connected to the flat terminals 10A and 10B on one side and the other side (left and right in the drawing) of the current collecting electrode 12, respectively. The tabs 13 connected to the current collecting electrodes 12 are welded to the flat terminals 10A and 10B, respectively (see FIG. 1B). The active layer 11, the collecting electrode 12, and the insulating layer 14 disposed between the flat terminals 10A and 10B are impregnated with an electrolyte solution.

  With such a configuration, the collecting electrode 12A connected to the flat terminal 10A among the collecting electrodes 12 becomes a positive electrode, and the collecting electrode 12B connected to the flat terminal 10B becomes a negative electrode. That is, between the collector electrodes 12A and 12B, the active layer 11 of the collector electrode 12A, the insulating layer 14, and the active layer 11 of the collector electrode 12B are arranged in this order, and a cell having an electric double layer capacity (Hereinafter, unit cell) is formed. Each unit cell is connected in parallel and stacked to form a stacked body, and this stacked body becomes the stacked cell 15.

  A unit cell is also formed between the flat terminal 10A and the collecting electrode 12B. Similarly, a unit cell is also formed between the flat terminal 10B and the collecting electrode 12A. Not necessary. For example, the active layer 11 may not be formed on the flat terminals 10A and 10B. In addition, the active layer 11 may be formed only on the lower surface of the uppermost collecting electrode 12B. In addition, the active layer 11 may be formed only on the upper surface of the lowermost collecting electrode 12A.

  2A and 2B are diagrams showing the current collecting electrodes and tabs of the double layer capacitor according to the present embodiment. FIG. 2A is a perspective developed view, and FIG. 2B is a current collecting electrode 12A, 12B shown in FIG. It is the top view which looked at the layer 14 from the current collection electrode 12A side.

  The tab 13 is a member for electrically connecting the collecting electrodes 12A and 12B to the flat terminals 10A and 10B, respectively, and for releasing the heat in the stacked cell 15 to the outside by heat conduction. For this reason, it is desirable to be comprised with a material with high heat conductivity, for example, what is necessary is just the ultra-thin sheet-like member made from aluminum same as the current collection electrode 12A and 12B.

  Further, as shown in FIGS. 2A and 2B, the tab 13 may have the same width as the collector electrodes 12A and 12B, and although not shown here, the collector electrode You may make it have a width | variety wider than 12A and 12B, and may have a narrow width | variety in the range which does not impair thermal conductivity. Further, the tab 13 may be integrally formed with the same member as the collecting electrodes 12A and 12B, or is a separate member connected to the collecting electrodes 12A and 12B and connected by welding or soldering. May be. Thus, whether the current collecting electrodes 12A and 12B and the tab 13 are integrated or connected separately, and how much the width of the tab 13 is set, considers thermal conductivity and electrical resistance. Then, it may be determined appropriately. In the case where the collecting electrodes 12A and 12B and the tab 13 are integrated, the number of manufacturing steps can be reduced as compared with the case where they are separated.

  FIG. 3 is a diagram conceptually showing the structure of the insulating layer of the electric double layer capacitor included in the module type capacitor of the present embodiment.

  The insulating layer 14 is, for example, a single fiber or composite fiber such as natural cellulose, and may be made of an ion-permeable insulator, and functions as a separator of the electric double layer capacitor 1.

  The insulating layer 14 has substantially the same width as the current collecting electrode 12 (length in a direction penetrating the paper surface), and a single fiber sheet is folded as shown in FIG. 2, and the current collecting is performed between the folded fiber sheets. The electrode 12 is disposed so as to be sandwiched. 2 shows a state before being completely folded for convenience of explanation, and each collecting electrode 12 is disposed so that the active layer 11 of each collecting electrode 12 is almost completely overlapped in a plan view. Is done.

  4A and 4B are diagrams showing one of the electric double layer capacitors included in the module type capacitor according to the present embodiment. FIG. 4A is a developed side view, FIG. 4B is a developed perspective view, and FIG. Is a side view. 4A and 4C, the structure of the stacked cell 15 is shown in a simplified manner for convenience of explanation. For the configuration of the active layer 11 and the collecting electrodes 12A and 12B included in the stacked cell 15, refer to FIGS. In FIG. 4B, the stacked cell 15 is omitted for convenience of explanation.

  As shown in FIG. 4A, the electric double layer capacitor 1 includes a flat terminal 10A, a seal member 17A, a multilayer cell 15, a rectangular annular side wall 16, a seal member 17B, and a flat terminal 10B.

  As shown in FIG. 4 (b), the side wall 16 is a rectangular annular aluminum or stainless steel member having an opening 16a capable of accommodating the laminated cell 15, and sealing members 17A and 17A at the upper and lower ends in the figure. It has adhesive portions 16A and 16B for adhering 17B.

  Further, an opening 16 </ b> C that is an injection part for injecting the electrolytic solution is disposed on one of the four side surfaces of the rectangular annular side wall 16. Two openings 16C are provided. One of the openings is connected to a vacuum pump to guide internal air to the external space, and the other is for injecting an electrolytic solution from the outside into the internal space. It is an opening. For this reason, the two openings are set to have opposite directions. The injection of the electrolytic solution is a process performed after the assembly as the electric double layer capacitor. When the injection is performed, if the opening 16C is positioned on the upper side, the electrolytic solution is spread to the back, and the injection process is efficiently performed. can do. In addition, when vacuuming and injection | pouring of electrolyte solution can be performed by one opening, one opening may be sufficient.

  The seal members 17A and 17B are seal members for bonding the flat terminals 10A and 10B and the side wall 16, and are formed of an insulating silicon-based, polyimide-based, or polypropylene-based adhesive. Further, the sealing members 17A and 17B may be a laminate material formed of a sealing member such as PTFE or PEEK and the above-described adhesive. The insulation is required to ensure insulation between the flat terminals 10A and 10B.

  In the stacked cell 15, the tab 13 is welded to the flat terminals 10 A and 10 B in a state of being accommodated in the opening 16 a of the rectangular annular side wall 16. In this state, the side wall 16 is sealed by the sealing members 17 A and 17 B and the flat terminals 10 A and 10 B By adhering to 10B, the side (four sides) in the stacking direction is surrounded by the side wall 16, and the electric double layer capacitor 1 as shown in FIG. The electric double layer capacitor 1 shown in FIG. 4C is one of the electric double layer capacitors included in the module type capacitor of the present embodiment.

  That is, in the electric double layer capacitor 1, the side wall 16 is bonded to the flat terminals 10A and 10B by the sealing members 17A and 17B, and the laminated cell 15 is sealed in a state of being accommodated therein.

  Further, the pair of surfaces in the stacking direction of the stacked cells 15 (that is, the upper surface of the uppermost collector electrode 12 and the lower surface of the lowermost collector electrode 12) are sandwiched by the flat terminals 10A and 10B. In this state, the flat terminals 10A and 10B are further crimped to improve the sealing performance, so that the electrolyte solution does not leak. A method of crimping the flat terminals 10A and 10B will be described later with reference to FIG.

  In such an electric double layer capacitor 1, when charging is performed from an external current source via the flat terminals 10A and 10B, charges (electrons and holes) supplied from the external current source are collected in the collecting electrodes 12A and 12B. To reach. Since the pores of the active layer 11 in each unit cell are impregnated with the electrolyte solution, the anion (anion) in the electrolyte solution moves to the current collecting electrode 12A serving as the positive electrode, and the current collector serving as the negative electrode. Cations (cations) move to the electrode 12B. Thereby, charging is completed. In addition, discharge is implement | achieved by supplying the electric power obtained by the process opposite to charge with respect to the load connected to flat terminal 10A and 10B.

  5A and 5B are diagrams showing the configuration of the module type capacitor according to the present embodiment, in which FIG. 5A shows a temporarily assembled state and FIG. 5B shows a completed state tightened with a bundle. In FIG. 5, priority is given to the visibility of the drawing, and the sealing members 17A and 17B shown in FIG. 4 are omitted.

  The module type capacitor 100 of the present embodiment has a structure in which five electric double layer capacitors 1 shown in FIG. In the five electric double layer capacitors 1, the flat terminals 10A and 10B of the electric double layer capacitors 1 adjacent to each other in the stacking direction are shared. The five electric double layer capacitors 1 are electrically connected in series. For this reason, the flat terminals 10A and 10B connected to the external circuit are the flat terminal 10B (−) of the first stage (the lowest stage in the figure) and the fifth stage (the uppermost stage in the figure). The flat terminal 10A (+) of the electric double layer capacitor 1).

  Here, as shown in (a), the flat terminal 10B (−) of the first stage (the lowest stage in the figure) of the electric double layer capacitor 1 connected to the external circuit and the fifth stage (the highest stage in the figure). The flat terminals 10A and 10B other than the flat terminal 10A (+) of the electric double layer capacitor 1 also extend from the side wall 16 (to the left and right in the figure), and heat is radiated from this extended portion. Thus, heat inside the stacked electric double layer capacitor 1 can be efficiently released to the outside.

  Further, the flat terminal 10B (−) of the electric double layer capacitor 1 at the first stage (the lowermost stage in the figure) and the electric double layer capacitor at the fifth stage (the uppermost stage in the figure) connected to the external circuit in this way. Since the flat terminals 10A and 10B other than the single flat terminal 10A (+) also extend from the side wall 16 (to the left and right in the figure), the structure of the five-stage electric double layer capacitor 1 is all the same. It is easy to make and can reduce the manufacturing cost.

  As shown in FIG. 5B, the modular capacitor 100 is tightened by a bundle 110, whereby three flat terminals 10A, four flat terminals 10B, five side walls 16, five pairs of seal members 17A, and 17B is crimped, and the sealing performance of the five electric double layer capacitors 1 is enhanced. A method for manufacturing the module type capacitor 100 will be described with reference to FIGS.

  FIG. 6 is a diagram illustrating a method for manufacturing the module type capacitor 100 of the present embodiment. In FIG. 6, priority is given to the visibility of the drawing, and the sealing members 17A and 17B shown in FIG. 4 are omitted.

  First, as shown to Fig.6 (a), the lamination | stacking cell 15 is mounted in the center part of the flat terminal 10B, and the tab 13 on the left side in the figure is welded to the flat terminal 10B.

  Next, as shown in FIG. 6B, the sealing member 17B, the side wall 16, and the sealing member 17A are stacked on the flat terminal 10B. At this time, the side wall 16 is bonded onto the flat terminal 10B by the sealing member 17B, and the stacked cell 15 is accommodated in the opening 16a of the side wall 16.

  Further, as shown in FIG. 6C, the tab 13 on the right side of the stacked cell 15 and the flat terminal 10A are welded in a state where the flat terminal 10A is aligned.

  Next, as shown in FIG. 6D, the tab 13 on the right side of the second layer cell 15 is welded to a desired position on the flat terminal 10A. Thereafter, the flat terminal 10A is bonded to the side wall 16 by the seal member 17A.

  Further, in the second stacked cell 15, as in FIG. 6B, the sealing member 17B, the side wall 16, and the sealing member 17A are overlaid on the flat terminal 10A. Thereby, the second stacked cell 15 is accommodated in the opening 16a of the side wall 16 overlaid on the flat terminal 10A to obtain the state shown in FIG.

  Thereafter, the flat terminal 10B is laminated, the third laminated cell 15 is mounted thereon, and the flat terminal 10A is laminated on the sealing member 17B, the side wall 16, and the sealing member 17A, and the laminated cell. The module type capacitor 100 in which the five electric double layer capacitors 1 shown in FIG. 5A are laminated is obtained by repeating this operation while welding the terminal 15 and the flat terminals 10A and 10B. Further, by fastening with the bundle 110, a module type capacitor 100 in which the five-stage electric double layer capacitor 1 is laminated as shown in FIG. 5B can be manufactured.

  The module type capacitor 100 manufactured in this manner has a structure in which five electric double layer capacitors 1 are stacked, and in the five electric double layer capacitors 1, the electric double layer capacitors 1 adjacent to each other in the stacking direction are connected. The flat terminals 10A and 10B are shared, and the five electric double layer capacitors 1 are electrically connected in series.

  As described above, according to the module type capacitor 100 of the present embodiment, since the tab 13 and the flat terminals 10A and 10B are connected, heat generated inside is conducted to the flat terminals 10A and 10B through the tab 13 and radiated. Is done. The conventional electric double layer capacitor is not provided with a mechanism for releasing internal heat, and the internal electrode is connected to the external terminal, but the thermal resistance in the connection path is large, and the external terminal The size of was small and heat dissipation was not considered. For this reason, according to the module type capacitor 100 of the present embodiment, it is possible to improve the performance of the module type capacitor 100 by suppressing an increase in internal temperature while reducing the necessity of cooling.

  In addition, the flat terminals 10A and 10B in the first stage and the fifth stage form an exterior, and a resin layer, like a conventional electric double layer capacitor, between the multilayer cell 15 and the flat terminals 10A and 10B, There is no insulating paper or casing, only the active layer 11 and the insulating layer 14 are present. Since these are much thinner than the resin, insulating paper, or casing included in the conventional electric double layer capacitor, the heat dissipation is further improved and the module can be made compact.

  Furthermore, since the electric double layer capacitors 1 at each stage are electrically connected by the flat terminals 10A or 10B, wiring or the like for connecting the plurality of electric double layer capacitors 1 is not necessary. .

  In addition, since the lowermost and uppermost flat terminals 10A and 10B form an outer package and the side wall 16 of each step forms an outer package, the number of parts is more than that obtained by modularizing a conventional electric double layer capacitor. The number of manufacturing steps can be reduced, and the cost can be reduced.

  In the above description, the configuration in which five electric double layer capacitors 1 are stacked and electrically connected in series has been described. However, the number of electric double layer capacitors 1 is not limited to five, and may be any number.

  In the above description, the five electric double layer capacitors 1 are stacked and electrically connected in series. However, a plurality of electric double layer capacitors 1 may be connected in parallel. For example, when the five electric double layer capacitors 1 shown in FIG. 5A are connected in parallel, the positive electrodes of the five stacked cells 15 are connected to all the flat terminals 10A, and 5 are connected to all the flat terminals 10B. The negative electrodes of the two stacked cells 15 may be connected.

  In the above description, the flat terminals 10A and 10B and the side wall 16 serving as exterior members have been described in order to ensure heat dissipation. However, the electric double layer capacitor 1 according to the present embodiment has been described. When it is necessary to ensure electrical insulation with peripheral devices in an environment where the product is used, the surface is coated with a very thin insulating resin except for the portions that require electrical connection with external devices. Or the surface may be covered with a heat-shrinkable resin.

  In the above description, the side wall 16 is made of aluminum or stainless steel. However, the material of the side wall 16 is not limited to these, and in order to prevent moisture from entering from the outside, gas permeable material is used. What is necessary is just to be comprised with the low material. In addition to aluminum or stainless steel, for example, an insulating material such as alumina may be used.

  In the above description, the side surface 16 has a flat side surface. However, the side surface may have a structure that can be expanded and contracted in the stacking direction of the stacked cell 15 like a bellows over the entire circumference, or The side wall 16 may be made of an aluminum or stainless steel member having a bellows portion. The side wall 16 including such a bellows can be produced by a bellow molding method, a hydroforming method, or a press molding method.

  In the above description, the side wall 16 has a rectangular annular shape. However, the shape of the side wall 16 is not limited to the rectangular annular shape, and may be various shapes such as a circle, an ellipse, and a polygon in plan view. Also good.

  In the above description, the side wall 16 has been described as having a sealing property between the flat terminals 10A and 10B by the sealing members 17A and 17B. However, instead of the sealing members 17A and 17B, a resin O-ring is used. It may be used.

[Modification 1]
FIG. 7 is a diagram illustrating a configuration of a module type capacitor according to Modification 1 of the present embodiment. In FIG. 7, priority is given to the visibility of the drawing, and the sealing members 17A and 17B shown in FIG. 4 are omitted.

  In the module type capacitor 100 shown in FIG. 5, the form in which the flat terminal 10 </ b> A extends to one side (right in the figure) and the flat terminal 10 </ b> B extends to the other side (left in the figure) has been described. As shown in FIG. 7A, the flat terminals 10A and 10B may be configured to extend to the same side (left side in the figure).

  Further, the method of welding the tab 13 of the laminated cell 15 to the flat terminals 10A and 10B is not the same in each stage of the electric double layer capacitor 1 as shown in FIG. ), The tabs 13 may be connected to the flat terminals 10A and 10B so that they are alternately arranged one by one.

  Further, FIG. 7C is a combination of a method of extending the flat terminals 10A and 10B as shown in FIG. 7A and a method of welding the tab 13 as shown in FIG. It may be configured as shown.

  In the configuration of the flat terminals 10A and 10B as shown in FIG. 7, as in the case shown in FIG. 5, the connection method between the plurality of stacked cells 15 is parallel connection even when connected in series. May be.

[Modification 2]
FIG. 8 is a diagram showing a configuration of the electric double layer capacitor 1 included in the module type capacitor of Modification 2 of the present embodiment. The electric double layer capacitor 1 included in the module type capacitor of Modification 2 is different from the electric double layer capacitor 1 shown in FIG. 4B in that the flat terminal 10B and the side wall 16 are integrated. Other configurations are the same.

  Thus, the seal member 17B can be omitted by integrating the side wall 16 with the flat terminal 10B.

  Even in the configuration as in the second modification, the insulation between the flat terminal 10A and the side wall 16 is ensured by the seal member 17A, so that the insulation between the flat terminals 10A and 10B is also ensured.

[Modification 3]
FIG. 9 is a diagram illustrating a configuration of a module type capacitor according to Modification 3 of the present embodiment. In FIG. 9, the visibility of the drawing is given priority, and the seal members 17A and 17B shown in FIG. 4 are omitted.

  The module type capacitor of Modification 3 is different in that it includes two electric double layer capacitors 1 connected in parallel.

  As shown in FIG. 9, the flat terminal 10A of the first and second stage electric double layer capacitors 1 is a positive terminal, and the flat terminal 10B of the first and second stage electric double layer capacitors 1 is a negative terminal. It becomes a terminal.

  Even in such a configuration, it is possible to provide a module type capacitor that improves the performance of the module type capacitor 100 by suppressing an increase in internal temperature while reducing the necessity for cooling.

[Modification 4]
10A and 10B are diagrams showing the configuration of a module type capacitor according to Modification 4 of the present embodiment, in which FIG. 10A is an enlarged view of the electric double layer capacitor 1 having a cooling water flow path, and FIG. It is a figure which shows the state which connected 3 type capacitors. In FIG. 10, the visibility of the drawing is given priority, and the seal members 17A and 17B shown in FIG. 4 are omitted.

  The module type capacitor of Modification 4 is different in that it includes a channel for allowing each electric double layer capacitor 1 to flow cooling water.

  As shown in FIG. 10 (a), the electric double layer capacitor 1 included in the module type capacitor of Modification 4 is outside the side wall 16 in the electric double layer capacitor 1 included in the module type capacitor shown in FIG. 7 (a). The difference is that a flow path 120 is provided between the flat terminals 10A and 10B in this area to allow cooling water to flow in a direction penetrating the drawing.

  This flow path 120 has the same thickness as the side wall 16 (vertical direction in the figure) and has a width that can be accommodated in the length of the extended portion of the flat terminals 10A and 10B (lateral direction in the figure). And embedded between the flat terminals 10A and 10B by bonding.

  As shown in FIG. 10B, the electric double layer capacitor 1 having such a flow path has a central electric double layer capacitor 1 that is difficult to be exposed to the outside air when a plurality of module type capacitors are arranged. It is particularly effective for cooling.

  Note that the three rows of module type capacitors may be electrically connected by either a serial connection method or a parallel connection method, and the five stacked cells included in each module type capacitor may also be electrically connected. They may be connected by any connection method of serial connection or parallel connection.

  In the above description, a module type capacitor is used as an example of a module type power storage device. However, the module type power storage device according to the present embodiment is not limited to a module type capacitor, and may be a module type lithium ion capacitor or a module type. It may be a module type power storage device such as a lithium ion secondary battery.

  Although the module type power storage device of the exemplary embodiment of the present invention has been described above, the present invention is not limited to the specifically disclosed embodiment, and departs from the scope of the claims. Various modifications and changes are possible.

It is a figure which shows the electric double layer capacitor contained in the module type capacitor of embodiment, (a) is sectional drawing seen from the front direction, (b) is a perspective view which shows typically the structure of the principal part. It is a figure which shows the current collection electrode and tab of the double layer capacitor of this Embodiment, (a) is a perspective developed view, (b) collects current collection electrode 12A, 12B and the insulating layer 14 which are shown to (a). It is the top view seen from the electric electrode 12A side. It is a figure which shows notionally the structure of the insulating layer of the electric double layer capacitor contained in the module type capacitor of this Embodiment. It is a figure which shows the structure of the surrounding part of the electric double layer capacitor contained in the module type capacitor of this Embodiment. It is a figure which shows the structure of the module type capacitor of this Embodiment, (a) shows the state of temporary assembly, (b) shows the completion state fastened with the bundle. It is a figure which shows the preparation methods of the module type capacitor 100 of this Embodiment. It is a figure which shows the structure of the module type capacitor of the modification 1 of this Embodiment. It is a figure which shows the structure of the electrical double layer capacitor 1 contained in the module type capacitor of the modification 2 of this Embodiment. It is a figure which shows the structure of the module type capacitor of the modification 3 of this Embodiment. It is a figure which shows the structure of the module type capacitor of the modification 4 of this Embodiment, (a) is an enlarged view of the electric double layer capacitor 1 provided with the flow path for cooling water, (b) is a module type capacitor 3 It is a figure which shows the state connected to the column.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric double layer capacitor 10A, 10B Flat terminal 11 Active layer 12, 12A, 12B Current collecting electrode 13 Tab 14 Insulating layer 15 Multilayer cell 16 Side wall 16a Opening 16A, 16B Adhesion part 16C Opening 17A, 17B Seal member 100 Module type capacitor 110 bundle 120 flow path

Claims (6)

Between the positive electrode and the negative electrode, a first active layer, an insulating layer, and a second active layer are disposed in this order, and a stacked cell that is a stacked body of unit cells impregnated with an electrolyte solution;
Covering one surface and the other surface in the stacking direction of the stacked cells, sandwiching the stacked cells, and so that the unit cells are connected in parallel, the positive electrode and the negative electrode of each unit cell A flat plate-like first plate and a second plate connected to each other;
A plurality of power storage devices including a surrounding portion that surrounds a side of the stacked cell in the stacking direction and seals between the first plate and the second plate;
The plurality of power storage devices are stacked, and the first plate or the second plate between the power storage devices adjacent to each other in the stacking direction is common.   The module type power storage device according to claim 1, wherein the plurality of power storage devices are electrically connected in series.   3. The module-type power storage device according to claim 1, wherein the first plate and the second plate are pulled out in different directions in a plan view.   3. The module-type power storage device according to claim 1, wherein the first plate and the second plate are pulled out in the same direction in a plan view.   The module type according to any one of claims 1 to 4, wherein a flow path for allowing cooling water to flow is formed outside the surrounding portion between the first plate and the second plate. Power storage device.   6. The module-type power storage device according to claim 1, wherein the surrounding portion is a rectangular annular side wall in a plan view that seals between the first plate and the second plate. 7.

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