JP2003109653A - Electrochemical cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrochemical cell easily assembled without uneven fastening, eliminating thread-fastening or caulking, and easily disassembled. SOLUTION: This electrochemical cell comprising an electrode body with at least a set of working electrode and counter electrode opposedly arranged through a separator; a storage container 21 for storing the electrode body, and a lid part 22 for the storage container 21. For the electrochemical cell, a pressing means 1 is further provided, and the storage container 21 is sealed by pressing the lid part 22 onto the storage container 21 by the pressing means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrochemical cell, and more particularly, to an electrochemical cell which is easy to assemble and disassemble and can efficiently evaluate battery materials.

[0002]

2. Description of the Related Art Conventionally, an electrochemical cell used for performance evaluation of a battery material has at least one set of electrode bodies, in which a positive electrode and a negative electrode are opposed to each other with a separator interposed between them, in a storage container and a lid part. It is configured by covering with a cover and fastening the housing and the lid with a plurality of screws. Examples of such electrochemical cells include HS cells and triode cells manufactured by Hosen Co., Ltd. When assembling these cells, problems caused by tightening the screws, such as bias of contact pressure between the electrode members,
It is necessary to pay attention so that the distance between the electrodes is not biased, the electrodes are displaced from each other, and the cells are not completely sealed.
In addition, since a plurality of screws must be loosened when disassembling, it is troublesome and there is room for improvement in terms of electrode replacement efficiency and evaluation efficiency.

When evaluating the effect of the electrode area and thickness in a cylindrical battery, a ribbon-shaped electrode body is wound around a spiral and filled in an outer container, and then the negative electrode terminal and the outer container, and The positive electrode terminal and the top cap are welded to each other, an electrolytic solution is injected, and the top cap is caulked in a container to form an electrochemical cell. However, when caulking, it is necessary to apply a sealant so as to prevent liquid leakage and adjust the caulking angle, which is troublesome and difficult. Further, when a defect such as a poor contact is found after the caulking, the top cap must be broken.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electrochemical cell that can be assembled easily and without tightening without screwing or caulking operations and can be easily disassembled.

[0005]

That is, according to the present invention, an electrode body in which at least one set of working electrode and counter electrode are arranged to face each other via a separator, a storage container for storing the electrode body, and a storage container An electrochemical cell comprising a lid, further comprising a pressurizing means, wherein the accommodating container is sealed by pressing the lid toward the accommodating container by the pressurizing means. is there. The preferred embodiments of the above invention are as follows. The electrochemical cell, wherein the pressing means is a hand press or a vise. The electrochemical cell, wherein the electrode body further includes at least one reference electrode, and has at least one body between the storage container and the lid. The electrochemical cell, wherein the electrode body is a spiral electrode body. The storage container further includes a hollow columnar member made of an electrically insulating material for storing the spiral electrode body, and a conductive material is provided between an upper end surface of the hollow columnar member and the lid. Further comprising an elastic member, wherein one of the leads of the electrode body is brought into contact with the elastic member on the upper end surface of the hollow columnar member by pressing the lid portion toward the storage container by the pressing means. The electrochemical cell, wherein the other lead of the electrode body is brought into contact with the bottom of the storage container under the lower end surface of the hollow columnar member. The electrode body has a plate-like structure, and an elastic member is further provided between the electrode body and the lid portion, and the elasticity is obtained by pressing the lid portion toward the storage container side by the pressing means. The electrochemical cell, wherein the working electrode, the separator and the counter electrode are brought into contact with each other via a member. The elastic member is made of a conductive material, and the elastic member is brought into contact with one of the leads of the electrode body by pressing the lid portion toward the storage container by the pressing means. The electrochemical cell.
The electrochemical cell, wherein the elastic member is a coil spring.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The electrochemical cell of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of one embodiment of the electrochemical cell of the present invention. This figure shows a state in which the lid 22 is pressure-bonded to the open end of the electrode container 21 by the pressurizing means 1 to seal the container 21. According to the pressurizing means 1, it is not necessary to adjust the lid and the plurality of screw holes of the container to be fastened together and to adjust the caulking angle. Further, even if some trouble is detected after sealing once, the cell can be disassembled and the trouble can be repaired simply by loosening the pressurizing means 1 and a new assembly can be easily performed, and a plurality of screws can be loosened. , No need to bother to break the caulked part.

Further, if the pressing surface of the pressing means 1 is made substantially the same as that of the lid portion 22 so that the entire surface of the lid portion 22 is pressed, the respective parts of the cell are evenly pressed. It is possible to avoid non-uniformity of the contact pressure state between the electrodes, liquid leakage, etc. due to the one-side tightening or the inclination of the caulking angle. As the pressurizing means 1, a known press machine such as a hand press, a crank press, a hydraulic press, a hydraulic press, and a vise can be used. Among them, a small hand press and a vise are easy to use, which is preferable. Further, the pressurizing means 1 may be equipped with a pressure gauge for accurately adjusting the pressure. Note that the pressing direction is not limited to from above, and it may be pressed up from below or may be pressed laterally. Also,
In order to electrically insulate between the pressing means 1 and the lid portion 22 and between the pressing means 1 and the electrode storage container 21, a sheet of an electrically insulating material such as polypropylene may be sandwiched, or the electrodes The storage container 22 may be stored in the outer case 3 made of polypropylene or the like.

FIG. 2 shows an electrode container 21 and a lid 22.
FIG. 3 is a cross-sectional view of one embodiment of the electrochemical cell body 2 made of. The electrode body is stored in the electrode storage container 21. The shapes and constituent materials of the storage container 21 and the lid portion 22 are not particularly limited, and may be metal, plastic, or ceramic cylinders or prisms. It is preferable that the storage container 21 and the lid 22 are made of metal such as SUS316, because they can be used as electrode leads. In addition, the storage container 2 is designed so that it can be easily pinched by a paper clip.
External terminals 51 and 52 made of screws may be provided on the lid 1 and the lid portion 22. Preferably, the working electrode is connected to the external terminal 51 of the electrode storage container 21, and the counter electrode is connected to the external terminal 52 of the lid portion 22. The external terminal can be configured by appropriately selecting a material that is free from corrosion, reaction, dissolution, etc., depending on the electrolytic solution of the battery, the cell voltage, and the like.

It is desirable to use an O-ring 7 in order to enhance the airtightness between the electrode container 21 and the lid 22. The O-ring 7 is made of a material having a high elastic modulus and electrolytic solution resistance, such as polytetrafluoroethylene (P
It is preferably composed of TFE), butyl rubber (IIR), and ethylene / propylene / diene terpolymer (EPDM). When the electrode container 21 and the lid 22 are made of plastic, instead of using an O-ring or the like,
The ends of the container and the lid may be sealed with a male taper and a female taper, respectively.

When the electrode housing 21 and the lid 22 are used as electrode leads, a spacer 6 is further used between the housing 21 and the lid 22 so that they are electrically insulated from each other. The spacer 6 may be made of electrically insulating material, preferably polypropylene. If the spacer is used, the electrode storage container 21 and the lid 22
It is preferable because it also functions as a packing that makes the gaps in parallel so that pressure is uniformly applied.

FIG. 3 shows an embodiment of the cell according to the present invention having a body portion 23 between the electrode container 21 and the lid portion 22. This embodiment is suitable when the electrode body has a three-pole configuration further having at least one reference electrode, and the electrode storage container 2
1, the lid portion 22, and the body portion 23 can be used as a working electrode, a counter electrode, and a reference electrode lead, respectively. As described above, the external terminals 51,
It is preferable to provide 52 and 53. Preferably, each of the external terminals 51 to 53 is provided in the number of 2, and more preferably in the number of 3. By using multiple external terminals, when monitoring the potential between any two poles, you can input to the plus and minus terminals of the recorder by fixing a paper clip or the like to the external terminals. Is convenient because it can be done easily. In the embodiment shown in FIG.
Screws 511 and 531 are used to secure leads or current collector terminals from the working and reference electrodes, respectively.

FIG. 4 shows a spiral electrode body which is one mode of the electrode body housed in the cell of the present invention. In the figure, the spiral electrode body 8 includes at least one working electrode (negative electrode) 81 and counter electrode (positive electrode) 82, and each current collector 85.
And 86 are welded with leads 811 and 821, respectively, and the separators 83 are sandwiched between the layers and the layers are wound and wound. The spiral electrode body 8 may include a reference electrode.

When the spiral electrode body 8 is stored in the storage container 21, one lead is attached to the bottom of the storage container 21.
For example, the lead 811 can be connected and the other lead 821 can be connected to the lid portion 22 for storage. At this time, the current collector 85
The lead from is fixed to the lead fixing jig 511,
It may be connected to the external terminal 51 via the lead fixing jig 511. The electrode body 8 may be housed as it is or wound with a separator, but it is preferably a hollow columnar member housed in an electrode housing container 21 as shown in FIG. A hollow columnar member 4 made of polypropylene and polyphenylene sulfide, in which the spiral electrode body 8 is housed in the hollow portion, is housed in a housing container 21. It is preferable to use the hollow columnar member 4 because the workability is improved.

More preferably, as shown in FIG. 5, the elastic member 10 is provided between the lid 22 and the upper end surface of the hollow columnar member 4.
By pressing the lid portion 22 toward the electrode storage container 21 side by the pressurizing means 1, the elastic member 10 is moved to the hollow columnar member 4
And press the working electrode lead 81 on the lower end surface of the hollow columnar member 4.
1 is pressed against the bottom of the electrode storage container 21 and the container 2
Contact pressure with 1. Particularly preferably, the elastic member 10 is made of a conductive material, and the cover portion 22 is pressed toward the storage container 21 side by the pressurizing means 1, whereby the counter electrode lead 812 is formed.
Is brought into contact with the elastic member 10 on the upper end surface of the hollow columnar member 4 and is electrically connected to the lid portion 22. In FIG. 5, the heights of the hollow columnar member 4 and the electrode body 8 are the same as those of the storage container 21.
The height of the hollow columnar member 4 may be changed between the height of the electrode body 8 and the depth of the storage container 21 or less. Further, the shape of the hollow portion of the hollow columnar member 4 may be a columnar shape, a square columnar shape or the like, depending on the shape of the electrode body housed therein.

As the elastic member 10, various springs, for example, a spiral spring, a leaf spring, a rod spring, a ring spring, a pillar-shaped plastic or rubber, a plurality of stacked packings, and the like can be used, but it is preferable. A metal spring is used. Further, in order to reduce the electric resistance, the surface may be plated with aluminum, nickel or the like. At that time, depending on the electrolytic solution of the constituting battery, the cell voltage, etc., corrosion, reaction, dissolution, etc. A substance that does not exist can be appropriately selected.

FIG. 6 is a sectional view of a plate-shaped electrode body which is another embodiment of the electrode body housed in the cell of the present invention. In the figure, the working electrode 91 and the counter electrode 92 of the plate-shaped electrode body 9 are arranged so as to face each other with a separator 94 in between. Preferably, it has a reference electrode 93, and the working electrode 91 and the reference electrode 93 are arranged so as to sandwich an electrically insulating layer 991 made of polypropylene, for example. The electrodes 91 to 93 are connected to the external terminals 51 to 53 via the current collectors 95 to 97, respectively. At this time, the current collector 9
The leads from 5 and 97 may be fixed to the lead fixing jigs 531 and 511, respectively, and may be connected to the external terminals 53 and 51, respectively.

The plate electrode body 9 may be composed of a plurality of sets of working electrodes, counter electrodes and reference electrodes. For example, FIG. 7 is a cross-sectional view in the case where two sets of working electrodes and counter electrodes are connected to form an electrode body. In the figure, when connecting in parallel, the working electrode 911
And 912 terminals are connected, counter electrodes 921 and 922 terminals are connected,
The counter electrode 922 and the reference electrode 93 are electrically insulated by the plate-shaped body 991. The working electrodes 911 and 912 may be insulated by the plate-shaped body 991, but a parallel connection can be more easily obtained by directly contacting pressure or by sandwiching a conductor instead of the plate-shaped body 991. . On the other hand, when connecting in series, the working electrode 911 and the counter electrode 922 are connected. Alternatively, in FIG. 7, the positions of the working electrode 912 and the counter electrode 922 are exchanged, and the counter electrode 922 and the working electrode 911 are connected to each other by the plate-shaped body 991.
In place of the above, by stacking via a conductor, a series connection can be obtained more easily. It should be noted that, depending on the arrangement of these electrodes, a gel-based electrolytic solution is used so that the electrolytic solution for each set of electrodes does not mix with each other.

FIG. 8 shows a state in which the plate electrode body 9 is housed. When the lid 22 is pressed by the pressing means 1, the lid 2
2 and the plate-shaped electrode body 9 are pressed by the elastic member 10 disposed between the plate-shaped electrode body 9 and each electrode, so that the contact pressure between each electrode and the separator and between each electrode and the current collector is increased. Is achieved.
At the same time, the plate electrode body 9 is fixed in the cell. In this way, it is possible to more easily achieve a more uniform contact pressure as compared with the case where fixing and contact pressure are conventionally performed by a plurality of screwing operations only by the pressing operation. As the elastic member 10, various types of springs, pillar-shaped plastic or rubber, a plurality of stacked packings, and the like can be used as described above. A wound spring is preferably used. By appropriately selecting the diameter of the spring and the spring constant, it is possible to set the load applied to the electrodes and the distance between the electrodes in an actual cylindrical battery or coin battery. Further, in order to uniformly transmit the pressure from the elastic member 10 to the electrode body, the plate member 992 shown in FIG. 7 may be placed on the electrode body. The plate-shaped member 992 of the plate-shaped electrode body 9 may be made of a substance having an appropriate hardness, and may be made of polypropylene, for example.

Preferably, the elastic member 10 is a conductive material,
For example, it is made of metal and used as an electrode lead. FIG. 9 is an enlarged cross-sectional view of the electrode body 9 of FIG. In the figure, the terminal of the collector 96 of the counter electrode 92 is extended to the back side of the plate member 992 made of polypropylene.
When the lid portion 22 is pressed toward the storage container 21 with the elastic member 1
0 presses the current collector terminal from above, and the counter electrode 92 and the lid 22
And conduct.

Like the spiral electrode body 8, if the plate electrode body 9 is housed by using the hollow columnar member 4 for accommodating the electrode body, the positional displacement between the electrode members and the electrode body will not occur. It is preferable because contact with the container 21 can be avoided.

The constituent material of the electrode body in the present invention is not particularly limited, and various combinations can be used.
In the case of evaluating a negative electrode material of an organic electrolyte battery, for example, a lithium ion battery, an electrode made of a negative electrode material such as a carbonaceous material, for example, natural graphite, amorphous carbon or the like, an organic polymer fired body or the like is used for the working electrode 81, Or a lithium transition metal compound,
A positive electrode material such as manganese dioxide or fluorinated graphite is used, and a lithium metal foil, carbon, or the like is used for the counter electrode 82 and the reference electrode 83. Further, as the separator 84, a nonwoven fabric made of glass fiber or a polyolefin microporous film such as polyethylene can be used. In the case of a water-based battery, a Ni-Cd battery system using nickel hydroxide as the working electrode 81 and cadmium hydroxide as the counter electrode 82, and a water-based capacitor using activated carbon as the working electrode 81 and the counter electrode 82 can also be configured. . As the current collector, stainless steel (austenite-based, ferrite-based, etc.), steel, aluminum, copper, nickel, titanium, carbon mesh or foil, etc., depending on the constituent electrolyte of the battery, cell voltage, etc. A material free from corrosion, corrosion, reaction, dissolution, etc. can be appropriately selected.

When gas is generated inside the cell and the pressure inside the cell becomes high, a safety mechanism such as, for example,
A hole is penetrated through a part of the lid portion 22 to form Al-PET and Al-PP.
It is preferable to provide a safety valve or a pressure valve in which the resin surface of a laminated film such as the above is placed in contact with the lid portion 22 and the hole is closed by hot pressing.

Examples of the present invention will be shown below. Example 1 An electrochemical cell containing the following lithium ion battery was assembled in an argon box. Put a 5 mm thick phenol resin molded plate in a silicon knit electric furnace and heat it up to 500 ° C at a rate of 50 ° C / hour in a nitrogen atmosphere.
The polyacene (PAS) synthesized by heating up to 650 ° C. at a rate of 0 ° C./hour and synthesizing was pulverized by a disk mill to obtain a powder having an average particle size of about 7 μm. H / C of this PAS powder
The ratio was 0.22. Next, 100 parts by weight of the PAS powder, 10 parts by weight of acetylene black and 10 parts of polyvinylidene fluoride powder.
A solution having 120 parts by weight of N-methylpyrrolidone dissolved therein was thoroughly mixed to obtain a slurry. The slurry to a thickness of 20
Apply to one side of copper foil of μm and press it, PAS of 110 μm thickness
A working electrode 91 was obtained. This was cut into a size of 15 × 20 mm and laminated on a SUS mesh current collector 95. Reference electrode 93
On the SUS mesh current collector 97, the thickness of 200μm, 15
It was prepared by pressure-bonding metallic lithium having a size of 20 mm. The counter electrode 92 was prepared by pressure-bonding metallic lithium having a thickness of 200 μm and a size of 15 × 20 mm on the SUS mesh current collector 96. As an electrolytic solution, a solution prepared by dissolving lithium hexafluorophosphate (LiPF ₆ ) in propylene carbonate at a concentration of 1 mol / l was used. Separator 9
As No. 4, a felt made of glass fiber was used. The current collectors 95 and 97 are fixed on both sides of a polypropylene-made insulating layer 991 having a thickness of 2 mm, and the SUS mesh current collector 96 is a polypropylene plate 9 having a thickness of 5 mm.
92 was bent from one side to the back side. A separator 94 is laid on the bottom of the electrode storage container 21, and a reference electrode 93 and a polypropylene plate 99 are placed on the separator 94 with the lithium metal surface facing downward.
1. The PAS working electrode 91, the separator 94 with the copper foil surface facing down, the counter electrode 92 with the lithium metal surface facing down, and the polypropylene plate member 992 having a thickness of 5 mm were laminated in this order. After connecting the current collector 95 of the working electrode 91 to the external terminal 51, the spacer 6 made of polypropylene and the O-ring 7 made of butyl rubber are placed on the upper end of the electrode storage container 21, the body portion 23 is overlapped, and the current collector of the reference electrode 93 is placed. 97 was connected to the external terminal 53. Next, the laminated body of the electrode storage container 21 and the body portion 23 is put into the outer case 3, the electrolytic solution is injected, the bell jar is covered, and the electrolytic solution is decompressed under the separator 94 and the working electrode 95.
Fully impregnated. Next, the polypropylene spacer 6 and the butyl rubber O-ring 7 are placed on the upper end of the body portion 23, the SUS winding spring 10 is placed on the polypropylene plate-shaped member 992, and the lid portion 22 is put on the SUS spring 10. Was pressed downward with the hand press 1 and brought into close contact with the upper end of the body portion 23. The assembling of the above-mentioned electrochemical cell took only about 5 minutes even in an argon box with poor workability, and could be easily carried out.

Comparative Example 1 An electrochemical cell of the type in which four points were fixed with screws using the same electrode body as that of the example was assembled. It was difficult to match the four screw holes of the electrode storage container and the lid, and it took more than 10 minutes to assemble.

Example 2 A cylindrical lithium ion battery was prepared. LiCoO ₂ was applied to both surfaces of the aluminum foil, and an aluminum lead 821 was ultrasonically welded to the non-applied portion to prepare a counter electrode (positive electrode) 82. Graphite is applied to both sides of the copper foil, and the nickel lead 81
1 was ultrasonically welded to prepare a working electrode (negative electrode) 81. The working electrode 81 and the counter electrode 82 were overlapped with each other with the separator 83 in between and wound to obtain the spiral electrode 8. Insert the tubular polypropylene hollow columnar member 4 into the storage container 21,
Put the spiral electrode 8 in it and insert the nickel lead 81.
1 is arranged between the bottom of the storage container 21 and the lower end surface of the hollow columnar member 4, and the hollow lead member 4 is pressed so that the nickel lead 811 is electrically connected to the storage container 21. . On the other hand, as shown in FIG. 5, the aluminum lead 821 is sandwiched between the winding spring 10 and the upper end surface of the hollow columnar member 4 by pressing the lid portion 22, and the lid portion is inserted via the winding spring 10. Folded to electrically connect to 22. After inserting the electrode storage container 21 into the outer case 3, the same electrolytic solution as in Example 1 was injected, and the working electrode 81, the counter electrode 82, and the separator 83 were sufficiently impregnated with the electrolytic solution under a reduced pressure by covering with a bell jar, and then hollow. The coil spring 10 is placed on the aluminum lead 811 on the upper end surface of the columnar member 4, and the lid 22 is placed on the aluminum spring 811.
2 was brought into close contact with the upper end of the storage container 21 to obtain a cylindrical battery evaluation cell. The above assembling was performed ten times. All of the batteries were good batteries, except one that failed to be wound into a battery and could not be made into a battery. The time required to assemble each piece was about 40 minutes.

Comparative Example 2 The same spiral electrode as in Example 2 was placed in an outer can,
The nickel lead of the negative electrode was resistance-welded to the bottom of the can to neck the top of the can. Next, after mounting a gasket on the top of the can, the aluminum lead of the positive electrode was ultrasonically welded to the top cap. After injecting the electrolytic solution, the top cap and the can were caulked to obtain a cylindrical battery. This assembly was done 10 times, but there were 3 lead welding defects, 2 liquid leaks, 1 winding defect, 2 that could not be inserted in the winding, and finally it became a battery. Was two. The time required for assembling one piece was about one hour.

[0027]

INDUSTRIAL APPLICABILITY The electrochemical cell of the present invention is easy to assemble and has uniform pressure contact between the battery members by using the pressing means. Also, because it is easy to disassemble,
The electrodes can be easily replaced.

[0028]

[Brief description of drawings]

FIG. 1 is a perspective view of one embodiment of an electrochemical cell of the present invention.

FIG. 2 is a cross-sectional view of one embodiment of the electrochemical cell body of the present invention.

FIG. 3 is a cross-sectional view of another embodiment of the electrochemical cell body of the present invention.

FIG. 4 is a perspective view of a spiral electrode body according to the present invention.

FIG. 5 is a cross-sectional view showing a state where a spiral electrode body is housed in an electrochemical cell.

FIG. 6 is a cross-sectional view of one embodiment of a plate-like electrode body in the electrochemical cell of the present invention.

FIG. 7 is a cross-sectional view of another embodiment of the plate electrode body in the electrochemical cell of the present invention.

FIG. 8 is a cross-sectional view showing a state where the plate-shaped electrode body is housed in an electrochemical cell.

9 is an enlarged cross-sectional view of the plate-shaped electrode body in FIG.

[0029]

[Explanation of symbols]

1 Pressurizing means 2 Electrochemical cell body 21 Electrode storage container 22 Lid 23 torso 3 exterior case 4 Hollow columnar members 51-53 external terminals 511 and 531 lead fixing jig 6 spacers 7 O-ring 8 Spiral electrode body 81 Working pole 82 opposite pole 83 separator 85 and 86 current collector 811 Working electrode lead 821 Counter electrode lead 9 Plate electrode body 91 Working pole 92 opposite pole 93 reference pole 94 separator 95-97 Current collector 911 and 912 Working pole 921 and 922 opposite poles 991 Electrically insulating layer 992 Plate-shaped member 10 Elastic member

Continued front page    F term (reference) 5H022 AA09 BB01 CC06 CC08 CC21                       EE09                 5H028 AA01 AA07 BB04 CC12                 5H029 AJ14 AL03 AM03 AM07 BJ02                       BJ14 CJ03

Claims (8)

[Claims] 1. An electrochemical cell comprising an electrode body in which at least one working electrode and a counter electrode are opposed to each other with a separator interposed therebetween, a storage container for storing the electrode body, and a lid portion of the storage container. An electrochemical cell, further comprising a pressurizing means, wherein the accommodating container is closed by pressing the lid portion toward the accommodating container by the pressurizing means. 2. The electrochemical cell according to claim 1, wherein the pressing means is a hand press or a vise. 3. The electrode body according to claim 1, further comprising at least one reference electrode, and having at least one body between the storage container and the lid. Electrochemical cell. 4. The electrochemical cell according to any one of claims 1 to 3, wherein the electrode body is a spiral electrode body. 5. A hollow columnar member made of an electrically insulating material for accommodating the spiral electrode body is further provided in the accommodating container, and between the upper end surface of the hollow columnar member and the lid portion. Further, an elastic member made of a conductive material is further provided, and one of the leads of the electrode body is elastically pressed on the upper end surface of the hollow columnar member by pressing the lid portion toward the storage container side by the pressing means. 5. The electrochemical cell according to claim 4, wherein the electrode is brought into contact with the member, and the other lead of the electrode body is brought into contact with the bottom of the storage container below the lower end surface of the hollow columnar member. . 6. The electrode body has a plate-like structure, and an elastic member is further provided between the electrode body and the lid portion, and the lid portion is pressed to the storage container side by the pressing means. The electrochemical cell according to any one of claims 1 to 3, wherein the working electrode, the separator, and the counter electrode are brought into contact with each other through the elastic member. 7. The elastic member is made of a conductive material, and the elastic member is brought into contact with one of the leads of the electrode body by pressing the lid portion toward the storage container by the pressing means. 7. The electrochemical cell according to claim 6, wherein: 8. The electrochemical cell according to claim 5, wherein the elastic member is a coil spring.