Power storage cell

Abstract

The capacitor cell (1) comprises an electrode body (100), a cell case (200) that accommodates the electrode body (100), and an external terminal (300) fixed to the upper surface of the cell case (200). The external terminal (300) has a terminal plate (330) positioned above the cell case (200) and an insulating plate (340) positioned between the cell case (200) and the terminal plate (330). The insulating plate (340) supports the terminal plate (330) so that a gap is formed between it and the terminal plate (330).

Description

Technology Field

[0001] The present disclosure relates to a capacitor cell. Background Technology

[0002] Japanese Patent Publication No. 2015-162458 discloses a conventional energy storage cell. This energy storage cell, as a secondary battery, comprises an electrode assembly, a case housing the electrode assembly, and a cap assembly sealing the upper opening of the case. The cap assembly includes a cap plate and an electrode terminal. The cap plate may be a metal plate of a size and shape corresponding to the upper opening of the case. A terminal through-hole is formed in the center of the cap plate, penetrating from the upper surface to the lower surface. An electrode terminal is inserted to pass through the terminal through-hole of the cap plate. The electrode terminal may consist of a cylindrical main body portion inserted into the terminal through-hole of the cap plate and a head portion protruding a certain length from the upper surface of the cap plate. The upper surface of the cap plate and the head portion of the electrode terminal are electrically insulated by a gasket. The problem to be solved

[0003] In some cases, the external terminals of multiple capacitor cells are connected to each other by a bus bar. In this case, the metal terminal portion of the external terminal (the head portion of the electrode terminal) is connected to the bus bar by welding. Heat generated during welding is transferred from the welding point of the external terminal to an insulating plate that insulates the metal terminal portion from the upper surface of the cell case. Consequently, there is a risk that the insulating plate may deform due to melting and thermal decomposition. If the insulating plate undergoes thermal deformation, the insulating member within the capacitor cell becomes more susceptible to relative displacement when external stress is applied to the insulating plate. Furthermore, there is a risk that the insulating performance of the insulating member may be degraded.

[0004] The present disclosure has been made in consideration of the above-mentioned problem, and the objective of the present disclosure is to provide a capacitor cell capable of suppressing the transfer of heat to an insulating plate when welding an external terminal to a bus bar. means of solving the problem

[0005] A capacitor cell according to one aspect of the present disclosure comprises an electrode body, a cell case that accommodates the electrode body, and an external terminal fixed to the upper surface of the cell case. The external terminal has a terminal plate disposed above the cell case and an insulating plate located between the cell case and the terminal plate. The insulating plate supports the terminal plate such that an air gap is formed between it and the terminal plate.

[0006] The above and other objects, features, aspects, and advantages of this invention will become apparent from the following detailed description of this invention as understood in conjunction with the accompanying drawings. Brief explanation of the drawing

[0007] FIG. 1 is a perspective view schematically showing a capacitor cell in a first embodiment of the present disclosure. Figure 2 is an exploded perspective view of the capacitor cell shown in Figure 1. Figure 3 is a cross-sectional view of the capacitor cell shown in Figure 1. Figure 4 is an enlarged cross-sectional view of the vicinity of the positive pole member. Figure 5 is an enlarged cross-sectional view of the vicinity of the negative electrode member. FIG. 6 is an enlarged cross-sectional view of a capacitor cell in a first variation of the first embodiment of the present disclosure. FIG. 7 is an enlarged cross-sectional view of a capacitor cell in a second modified example of the first embodiment of the present disclosure. FIG. 8 is a perspective view schematically showing a capacitor cell in a second embodiment of the present disclosure. FIG. 9 is an exploded perspective view of the capacitor cell shown in FIG. 8. Specific details for implementing the invention

[0008] Embodiments of the present disclosure will be described with reference to the drawings. In addition, in the drawings referenced below, the same or equivalent components are given the same number.

[0009] (First embodiment)

[0010] FIG. 1 is a schematic perspective view of a capacitor cell according to a first embodiment of the present disclosure. FIG. 2 is an exploded perspective view of the capacitor cell shown in FIG. 1. FIG. 3 is a cross-sectional view of the capacitor cell shown in FIG. 1.

[0011] As shown in FIGS. 1 to 3, the capacitor cell (1) is equipped with an electrode body (100), a cell case (200), an external terminal (300), a connecting member (400), and an insulating member (500).

[0012] The electrode body (100) has a plurality of unit electrode bodies (111, 112) and an insulating film (120). In this embodiment, the plurality of unit electrode bodies includes two unit electrode bodies (111, 112). Each unit electrode body (111, 112) includes a plurality of tabs, namely a plurality of positive electrode tabs (110P) and a plurality of negative electrode tabs (110N). Each unit electrode body (111, 112) has the same structure as the others. For this reason, the unit electrode body (111) will be described below.

[0013] The unit electrode body (111) includes a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet, the negative electrode sheet, and the separator are formed in a long rectangular shape.

[0014] The positive electrode sheet comprises a metal foil and a positive electrode composite layer formed on the metal foil. On the upper long side of the metal foil, an uncoated portion is formed where the positive electrode composite layer is not formed, and in this uncoated portion, the plurality of positive electrode tabs (110P) are formed at intervals from each other.

[0015] The negative electrode sheet comprises a metal foil and a negative electrode composite layer formed on the metal foil. On the upper long side of the metal foil, an uncoated portion is formed where the negative electrode composite layer is not formed, and in this uncoated portion, the plurality of negative electrode tabs (110N) are formed at intervals from each other.

[0016] In the wound state of each sheet, each positive electrode tab (110P) is formed to be arranged in the thickness direction (a direction perpendicular to the ground in FIG. 3), and each negative electrode tab (110N) is formed to be arranged in the thickness direction. Additionally, the positive electrode tab (110P) and the negative electrode tab (110N) are spaced apart in the width direction (a direction perpendicular to both the thickness direction and the height direction).

[0017] The insulating film (120) has a shape that covers the entire circumferential surface and bottom surface of a plurality of unit electrode bodies (111, 112).

[0018] The cell case (200) accommodates the electrode body (100). The cell case (200) also accommodates an electrolyte, the illustration of which is omitted. The cell case (200) is sealed. The cell case (200) has a case body (210) and a cover (220).

[0019] The case body (210) has an opening (211) that opens upward. The case body (210) is made of a metal such as aluminum. The case body (210) has a bottom wall (212) and a perimeter wall (214). The bottom wall (212) is formed in a rectangular or flat shape. The perimeter wall (214) stands upright from the bottom wall (212). The perimeter wall (214) is formed in a rectangular shape. The length of the perimeter wall (214) in the width direction is longer than the length of the perimeter wall (214) in the thickness direction. The length of the perimeter wall (214) in the height direction is longer than the length of the perimeter wall (214) in the thickness direction.

[0020] The cover (220) closes the opening (211) of the case body (210). The cover (220) is connected to the opening (211) by welding or the like. The cover (220) is formed in a flat shape. The cover (220) is made of a metal such as aluminum. The cover (220) has a cover body (222) and an inversion plate (224).

[0021] The cover body (222) is connected to the case body (210) by welding or the like. The cover body (222) has a pressure release valve (222a), a liquid injection port (222b), a sealing member (222c), and a pair of pin insertion through holes (222d) formed therein.

[0022] A pressure release valve (222a) is formed in the central part of the cover body (222). The pressure release valve (222a) is formed to break when the internal pressure of the cell case (200) exceeds a predetermined pressure. As the pressure release valve (222a) breaks, the gas inside the cell case (200) is released out of the cell case (200) through the pressure release valve (222a), thereby lowering the internal pressure of the cell case (200).

[0023] The injection hole (222b) is a through hole for injecting an electrolyte into the cell case (200) during the manufacturing process of the capacitor cell (1).

[0024] The sealing member (222c) is a member that seals the injection port (222b). The injection port (222b) is sealed by the sealing member (222c) after the electrolyte is injected into the case body (210).

[0025] A pair of pin insertion through holes (222d) are formed spaced apart from each other in the width direction. Each pin insertion through hole (222d) is a through hole for inserting and passing a connecting pin (420) to be described later.

[0026] The inversion plate (224) is connected to the cover body (222) by welding or the like. The inversion plate (224) has a shape that is curved so as to be convex from the outside to the inside of the cover body (222). When the internal pressure of the cell case (200) becomes greater than or equal to a predetermined pressure, the inversion plate (224) is deformed into a shape that is curved so as to be convex from the inside to the outside of the cell case (200).

[0027] The external terminal (300) is fixed to the upper surface of the cell case (200). A bus bar, which is not shown, is connected to the external terminal (300) by welding or the like. The external terminal (300) has a positive electrode member (300P) and a negative electrode member (300N).

[0028] The positive electrode member (300P) is connected to the upper surface of the cell case (200) by welding or the like. The positive electrode member (300P) has a positive electrode terminal plate (310) and a terminal block (320).

[0029] FIG. 4 is an enlarged cross-sectional view of the vicinity of the positive electrode member. As shown in FIG. 3 and FIG. 4, the positive electrode terminal plate (310) is formed in a rectangular shape. The positive electrode terminal plate (310) is made of a metal such as aluminum.

[0030] The terminal block (320) is formed in a rectangular shape. The terminal block (320) is made of a metal (such as iron) different from the metal constituting the positive terminal plate (310). The terminal block (320) is connected to the upper surface of the cover body (222) by welding, and the positive terminal plate (310) is connected to the upper surface of the terminal block (320) by welding or the like. In short, the case body (210) and the cover (220) are electrically connected to the positive terminal plate (310) via the terminal block (320) and are charged with the same polarity as the positive terminal plate (310). A through hole is formed in each of the positive terminal plate (310) and the terminal block (320) to allow the positive connection pin (420P), which will be described later, to be inserted and passed through.

[0031] The negative electrode member (300N) is connected to the upper surface of the cell case (200) by welding or the like. The negative electrode member (300N) is spaced apart in the width direction from the positive electrode member (300P). The negative electrode member (300N) has a negative electrode terminal plate (330) and an insulating plate (340).

[0032] FIG. 5 is an enlarged cross-sectional view of the vicinity of the negative electrode member. As shown in FIG. 3 and FIG. 5, the negative electrode terminal plate (330) is formed in a roughly rectangular shape. The negative electrode terminal plate (330) is positioned above the cell case (200). More specifically, the negative electrode terminal plate (330) is positioned above the inversion plate (224). As shown in FIG. 5, the negative electrode terminal plate (330) has an opposing portion (332) facing the inversion plate (224). Additionally, when the internal pressure of the cell case (200) is less than a predetermined pressure (normally), the inversion plate (224) is separated from the opposing portion (332).

[0033] An insulating plate (340) is fixed to the upper surface of the cover (220). At least a portion of the insulating plate (340) is located between the cell case (200) (cover (220)) and the negative terminal plate (330). The insulating plate (340) insulates the space between the cover (220) and the negative terminal plate (330). The insulating plate (340) supports the negative terminal plate (330).

[0034] The insulating plate (340) supports the negative terminal plate (330) so that a gap (V) is formed between it and the negative terminal plate (330). As a result, since the heat applied when welding the negative terminal plate (330) to the bus bar is released into the gap (V), the heat generated during welding between the negative terminal plate (330) and the bus bar can be suppressed from being transferred to the insulating plate (340).

[0035] Each of the negative terminal plate (330) and the insulating plate (340) has a through hole formed therein for inserting and passing the negative connecting pin (420N) described later.

[0036] As shown in FIGS. 3 and 5, the insulating plate (340) has an exposure opening (342) that exposes the opposing portion (332).

[0037] The insulating plate (340) is described in more detail. The insulating plate (340) has a flat plate portion (344), a plurality of interposed portions (346), and a perimeter wall portion (348).

[0038] The flat plate (344) is formed on the upper surface of the cell case (200). The flat plate (344) is in contact with the cover (220) (cover body (222)). An exposure opening (342) is formed in the flat plate (344). The flat plate (344) is made of an insulating resin.

[0039] Multiple intermediaries (346) are located between the flat plate (344) and the negative terminal plate (330). The multiple intermediaries (346) are spaced apart from each other and are in contact with both sides of the flat plate (344) and the negative terminal plate (330). As a result, the negative terminal plate (330) is stably supported by the multiple intermediaries (346), and the volume of the gap (V) can be made relatively larger compared to the case where a single intermediary (346) is located over the entire space between the flat plate (344) and the terminal plate. Furthermore, heat generated during welding of the negative terminal plate (330) and the bus bar can be suppressed from being transferred to the insulating plate (340).

[0040] The interposed portion (346) is an adhesive member that is bonded to both sides of, for example, the flat portion (344) and the negative terminal plate (330). By the interposed portion (346) being such an adhesive member, a gap (V) is formed between the flat portion (344) and the negative terminal plate (330), thereby preventing the negative terminal plate (330) from dissociating from the flat portion (344) of the insulating plate (340).

[0041] The adhesive member is, for example, a cured product of an adhesive made of a resin composition. Thus, the negative terminal plate (330) can be positioned and arranged on the adhesive before curing formed on the flat plate (344).

[0042] The specific type of adhesive is not particularly limited. The adhesive may be, for example, a hot melt adhesive, or a two-component curing adhesive made of a resin composition containing a thermosetting resin as a main component. Examples of two-component curing adhesives include two-component curing urethane-based adhesives.

[0043] Additionally, the adhesive member does not have to be a cured product of an adhesive. The adhesive member may be an adhesive tape with pressure-sensitive adhesive formed on both sides.

[0044] Additionally, the interposition (346) is not limited to an adhesive member. The interposition (346) may be a porous foam, for example, made of a resin composition. This allows for easy formation of a void between the flat plate (344) and the negative terminal plate (330). When the interposition (346) is a porous foam, the insulating plate (340) may have only a single interposition (346).

[0045] The perimeter wall portion (348) stands upright from the flat plate portion (344). The perimeter wall portion (348) is formed in a rectangular shape. The perimeter wall portion (348) surrounds the negative terminal plate (330). The perimeter wall portion (348) is in contact with the negative terminal plate (330) over its entire perimeter.

[0046] Additionally, the insulating plate (340) is not limited to the above embodiment as long as it supports the negative terminal plate (330) so that a gap (V) is formed between it and the negative terminal plate (330). FIG. 6 is an enlarged cross-sectional view of a capacitor cell in a first modified example of the first embodiment of the present disclosure. FIG. 6 shows a capacitor cell in the first modified example when viewed from the same cross-section as FIG. 5.

[0047] As shown in FIG. 6, the plurality of interposed parts (346a) may be composed of a single member together with the flat plate (344). This allows for the suppression of an increase in the number of parts of the insulating plate (340). The plurality of interposed parts (346a) protrude from the flat plate (344) in a direction opposite to that of the cell case (200) (cover (220)).

[0048] Also, the thickness of the flat portion (344) of the insulating plate (340) is preferably as thick as possible from the perspective of suppressing heat during welding from being transferred to the cell case (200) and the electrode body (100). This is because the thermal conductivity of the insulating plate (340) (flat portion (344)) is lower than the thermal conductivity of the metal cell case (200).

[0049] FIG. 7 is an enlarged cross-sectional view of a capacitor cell in a second modified example of the first embodiment of the present disclosure. FIG. 7 shows a capacitor cell in the second modified example when viewed from the same cross-section as FIG. 5.

[0050] As shown in FIG. 7, the cover (220) (cover body (222)) may have a recess (226) formed on its upper surface. An insulating plate (340) (flat plate (344)) may be fitted into the recess (226). This allows the thickness of the flat plate (344) to be relatively thick. Additionally, the displacement of the insulating plate (340) is further suppressed.

[0051] As shown in FIG. 3, the connecting member (400) connects a plurality of taps (110P, 110N) and an external terminal (300). The connecting member (400) has a current collector plate (410) and a connecting pin (420).

[0052] The current collector plate (410) is connected to multiple taps. The current collector plate (410) has a positive current collector plate (410P) and a negative current collector plate (410N).

[0053] The positive electrode collector plate (410P) is connected to a plurality of positive electrode tabs (110P) by welding or the like. The positive electrode collector plate (410P) has a first flat plate portion (411) and a second flat plate portion (412).

[0054] A plurality of positive electrode tabs (110P) are connected to the first flat plate (411) by ultrasonic welding or the like. A through hole is formed in the first flat plate (411). A plurality of positive electrode tabs (110P) are connected to the lower surface of the first flat plate (411). However, a plurality of positive electrode tabs (110P) may be connected to the upper surface of the first flat plate (411).

[0055] The second flat plate (412) is positioned on the outer side of the first flat plate (411) in the width direction. A connecting hole (412h) is formed in the second flat plate (412). Additionally, as shown in FIG. 3, a thin-walled section may be formed between the second flat plate (412) and the first flat plate (411).

[0056] The negative electrode collector plate (410N) is connected to a plurality of negative electrode tabs (110N) by welding or the like. The configuration of the negative electrode collector plate (410N) is substantially the same as the configuration of the positive electrode collector plate (410P).

[0057] The connecting pin (420) connects the collector plate (410) and the external terminal (300). The connecting pin (420) has a positive connecting pin (420P) and a negative connecting pin (420N).

[0058] The positive electrode connecting pin (420P) connects the positive electrode collector plate (410P) and the positive electrode terminal plate (310). The positive electrode connecting pin (420P) is formed in a cylindrical shape. The lower end of the positive electrode connecting pin (420P) is connected to the second flat plate (412) while inserted into the connecting hole (412h). The upper end of the positive electrode connecting pin (420P) is caulked to the positive electrode terminal plate (310).

[0059] The negative electrode connecting pin (420N) connects the negative electrode collector plate (410N) and the negative electrode terminal plate (330). The negative electrode connecting pin (420N) is formed in a cylindrical shape. The lower end of the negative electrode connecting pin (420N) is connected to the second flat plate (412) while inserted into the connecting hole (412h). The upper end of the negative electrode connecting pin (420N) is caulked to the negative electrode terminal plate (330).

[0060] The insulating member (500) insulates the connection member (400) and the cell case (200). The insulating member (500) has an insulating sheet (510) and an insulator (520).

[0061] The insulating sheet (510) is connected to the lower surface of the cover body (222). In the insulating sheet (510), through holes are formed in the portion overlapping with the pressure release valve (222a) in the height direction, the portion overlapping with the injection hole (222b), the portion overlapping with each pin insertion through hole (222d), and the portion overlapping with the inversion plate (224).

[0062] When the internal pressure of the cell case (200) rises above the predetermined pressure due to an abnormal occurrence of the electrode body (100), the inversion plate (224) comes into contact with the opposite part (332) of the negative terminal plate (330) by being inverted (deformed into a shape that is curved so as to be convex toward the top).

[0063] The insulator (520) has a shape that surrounds the connecting pin (420) and insulates the connecting pin (420) from the cell case (200). The insulator (520) has a positive electrode insulator (520P) and a negative electrode insulator (520N).

[0064] The positive electrode insulator (520P) covers the positive electrode connecting pin (420P). The positive electrode insulator (520P) is formed in a cylindrical shape. The positive electrode connecting pin (420P) has a covering portion (422) covered by the positive electrode insulator (520P).

[0065] The negative electrode insulator (520N) covers the negative electrode connecting pin (420N). The structure of the negative electrode insulator (520N) is the same as the structure of the positive electrode insulator (520P).

[0066] (Second embodiment)

[0067] Next, with reference to FIGS. 8 and FIGS. 9, a capacitor cell (1) in a second embodiment of the present disclosure will be described. In addition, in the second embodiment, only parts that differ from the first embodiment will be described, and descriptions of structures, operations, and effects identical to those in the first embodiment will not be repeated.

[0068] FIG. 8 is a schematic perspective view of a capacitor cell in a second embodiment of the present disclosure. FIG. 9 is an exploded perspective view of the capacitor cell shown in FIG. 8. As shown in FIG. 8 and FIG. 9, the capacitor cell (1) in the present embodiment further comprises an inner insulator (610) and an outer insulator (620).

[0069] The inner insulator (610) is positioned inside the cell case (200). More specifically, the inner insulator (610) is positioned between the electrode body (100) and the current collector plate (410). The positive electrode tab (110P) and the negative electrode tab (110N) are connected to the current collector plate (410) above the inner insulator (610). A through hole is formed in the inner insulator (610) at a portion that overlaps with the through hole of the first flat plate portion (411) in the height direction. Additionally, in this embodiment, as shown in FIG. 9, the electrode body (100) has four unit electrode bodies (111 to 114).

[0070] The outer insulator (620) is positioned on the outside of the cell case (200). More specifically, the outer insulator (620) is positioned on the upper surface of the cover (220). In the outer insulator (620), through holes are formed in the portion overlapping with the positive electrode member (300P) in the height direction, the portion overlapping with the negative electrode member (300N), the portion overlapping with the pressure release valve (222a), and the portion overlapping with the injection hole (222b).

[0071] As shown in FIG. 9, the insulating member (500) additionally has a pair of side sheets (511) connected to an insulating sheet (510). Each of the pair of side sheets (511) has a shape that extends downward from the edge portion of the insulating sheet (510) in the thickness direction. The pair of side sheets (511) are disposed between the side of the electrode body (100) and the case body (210).

[0072] As shown in FIGS. 8 and 9, the negative electrode member (300N) additionally has an insulating plate (350). Also, the negative electrode terminal plate (330) has a terminal block (331) and a conductive plate (335). The conductive plate (335) is fixed on an insulating plate (340), and the terminal block (331) is connected to the conductive plate (335) by welding or the like. A through hole is formed in each of the conductive plate (335) and the terminal block (331) to insert and pass a negative electrode connecting pin (420N). The conductive plate (335) has an opposing portion (332). The insulating plate (350) covers the portion of the conductive plate (335) located above the inversion plate (224).

[0073] It is understood by those skilled in the art that the exemplary embodiments described above are specific examples of the following embodiments.

[0074] [Mode 1]

[0075] Electrode body and,

[0076] A cell case accommodating the above electrode body, and

[0077] The cell case is provided with an external terminal fixed to the upper surface, and

[0078] The above external terminal is,

[0079] A terminal plate positioned above the cell case, and

[0080] having an insulating plate located between the cell case and the terminal board,

[0081] The above insulating plate supports the terminal plate so as to form a gap between it and the terminal plate, forming a capacitor cell.

[0082] According to the capacitor cell of this embodiment, since the heat generated when welding the external terminal to the bus bar is released into the air gap, the heat generated during the welding of the terminal plate and the bus bar can be suppressed from being transferred to the insulating plate.

[0083] [Mode 2]

[0084] The above insulating plate comprises a flat plate portion formed on the upper surface of the cell case, and

[0085] having a plurality of intervening portions located between the above-mentioned flat plate portion and the above-mentioned terminal plate,

[0086] The capacitor cell described in Embodiment 1, wherein the plurality of interposed portions are spaced apart from each other and are in contact with both sides of the flat plate portion and the terminal plate.

[0087] According to this embodiment, the terminal plate is stably supported by multiple intermediaries, and the volume of the gap can be increased compared to the case where a single intermediary is located throughout the entire space between the flat plate and the terminal plate. Furthermore, the transfer of heat to the insulating plate during welding of the terminal plate and the bus bar can be suppressed.

[0088] [Mode 3]

[0089] The capacitor cell described in Embodiment 2, wherein the plurality of interposed portions are adhesive members that are bonded to both the flat plate portion and the terminal plate.

[0090] According to this embodiment, since the interposed portion is such an adhesive member, a gap can be formed between the flat plate portion and the terminal plate, thereby preventing the terminal plate from separating from the flat plate portion of the insulating plate.

[0091] [Mode 4]

[0092] The above adhesive member is a capacitor cell described in Embodiment 3, which is a cured product of an adhesive made of a resin composition.

[0093] According to this embodiment, a terminal plate can be positioned and arranged on the adhesive formed on the flat plate before curing.

[0094] [Mode 5]

[0095] The above insulating plate comprises a flat plate portion formed on the upper surface of the cell case, and

[0096] having an interposition located between the above-mentioned flat plate and the above-mentioned terminal plate,

[0097] The above-mentioned interposition is a capacitor cell described in any one of embodiments 1 to 4, which is a foam having the above-mentioned voids and is made of a resin composition.

[0098] According to this embodiment, since the interposed part is a foam, a gap can be easily formed between the flat plate and the terminal plate.

[0099] Although embodiments of the present invention have been described, the embodiments disclosed herein should be considered as illustrative and not limiting in all respects. The scope of the present invention is defined by the claims, and all modifications within the meaning and scope equivalent to the claims are intended to be included.

Claims

Claim 1 A capacitor cell comprising an electrode body, a cell case accommodating the electrode body, and an external terminal fixed to the upper surface of the cell case, wherein the external terminal has a terminal plate disposed above the cell case and an insulating plate located between the cell case and the terminal plate, wherein the insulating plate supports the terminal plate such that a gap is formed between it and the terminal plate, and wherein the insulating plate has a flat plate portion formed on the upper surface of the cell case and a plurality of intervening portions located between the flat plate portion and the terminal plate, wherein the plurality of intervening portions are spaced apart from each other and are in contact with both sides of the flat plate portion and the terminal plate. Claim 2 delete Claim 3 In claim 1, the plurality of interposed portions are adhesive members that are bonded to both the flat plate portion and the terminal plate, forming a capacitor cell. Claim 4 In claim 3, the adhesive member is a capacitor cell that is a cured product of an adhesive made of a resin composition. Claim 5 In any one of claims 1, 3 and 4, the interposed portion is a capacitor cell having the pores, which is a foamed body made of a resin composition.

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