JP7368655B2 - electrochemical cell - Google Patents

Description

The present invention relates to electrochemical cells.
This application claims priority to Japanese Patent Application No. 2021-036425 filed in Japan on March 8, 2021, the contents of which are incorporated herein.

Electrochemical cells such as lithium ion secondary batteries and electrochemical capacitors have been widely used as power sources for small electronic devices and wearable devices such as wristwatches, smart watches, smartphones, headsets, and hearing aids.
In recent years, the need for this type of electrochemical cell to be smaller and thinner has become stronger. One reason for this is that the various electronic devices in which electrochemical cells are mounted are equipped with high-spec functions that were not available in the past, as ICs (integrated circuits) become more sophisticated and have higher performance due to lower power consumption. This is because electronic devices are beginning to be proposed.

In this type of electrochemical cell, for example, a metal case or a laminate film is known as an exterior body for accommodating an electrode body therein.
The metal case includes, for example, a cylindrical case body with a bottom and a sealing plate that seals the opening of the case body by caulking or the like via a resin gasket, and has a coin shape, a button shape, or a tube shape as a whole. It is often composed of

On the other hand, when a laminate film is used as the exterior body, it is possible to increase the degree of freedom in shape. Therefore, it is easy to reduce the size and increase the capacity of the electrochemical cell itself.
For example, Patent Document 1 below discloses an electrochemical cell including, as an exterior body, a first sheet formed in a cylindrical shape with a bottom by a laminate film, and a second sheet formed in a cylindrical shape with a bottom in a laminate film. is disclosed.
The second sheet is arranged inside the first sheet, with the electrode body housed between the second sheet and the first sheet. The peripheral edge of the first sheet and the peripheral edge of the second sheet are welded over the entire circumference with an annular sealant film interposed therebetween. Thereby, the first sheet and the second sheet seal the internal space in which the electrode body is accommodated.
Note that the sealant film is formed by overlapping films made of thermoplastic resin.

Japanese Patent Application Publication No. 2017-126558

By the way, when a laminate film is used as an exterior body as in the electrochemical cell described in Patent Document 1, the electrode body is housed by welding (thermal fusion) using a sealant film made of thermoplastic resin. The internal space is sealed. However, since sealing is performed by welding resin, it is difficult to obtain sufficient sealing performance.

On the other hand, when a metal case with a bottomed cylindrical case body and a sealing plate is used as the exterior body, it has the advantage of being able to obtain higher sealing performance than when using a laminate film. be. In particular, when the case body and the sealing plate are welded together by laser welding or the like instead of being fixed by caulking or the like, it is possible to obtain excellent sealing performance.
Furthermore, when the case body and the sealing plate are joined by welding, the mechanical strength required of the metal material can be suppressed compared to when the case body and the sealing plate are fixed by caulking, so it is easier to reduce the thickness of the metal material itself. Therefore, it is possible to obtain the advantage that the exterior body can be formed thinly, which leads to an increase in internal capacity.

However, when the thickness of the sealing plate is reduced, the sealing plate becomes easily bent. Therefore, workability is reduced, such as making it difficult to weld the case body and the sealing plate. Furthermore, the sealing plate is likely to be misaligned with respect to the case body due to bending or warping of the sealing plate. Therefore, welding defects tend to occur, and there is a fear that sufficient sealing performance cannot be obtained.

The present invention has been made in consideration of these circumstances, and its purpose is to obtain reliable sealing performance even if the exterior body is made thin, and to also lead to improved productivity. The purpose of the present invention is to provide an electrochemical cell that can perform the following steps.

(1) An electrochemical cell according to one aspect of the present invention has an electrode body, a side part, a first bottom part and a second bottom part facing each other in the axial direction of the battery, and has a housing space formed therein. The present invention includes an exterior body that houses the electrode body, and a current collector plate that is electrically connected to the electrode body and at least partially exposed to the outside of the exterior body . The exterior body includes a first member including the first bottom portion, a second member including the second bottom portion and welded to the first member, and a second member that is disposed within the housing space in the axial direction of the battery. a support column disposed along the bottom and supporting the first bottom part and the second bottom part. In the electrode body, a positive electrode and a negative electrode stacked with a separator in between are wound around the centerline axis of the support column. The current collector plate is welded to the first bottom via an insulating sealant. A first end of the support column is in contact with the current collector plate, and a second end is in contact with the second bottom .

According to the electrochemical cell, the supporting space is housed in addition to the electrode body in the housing space. The support column supports a first bottom portion and a second bottom portion that face each other in the axial direction of the battery. Thereby, the first member can be supported with respect to the second member, for example, using the support column.
Therefore, even if the entire exterior body is formed thin, unintended deformation such as bending of the first member can be suppressed before the first member and the second member are welded together. Therefore, welding work can be performed while suppressing misalignment of the first member with respect to the second member, and work efficiency can be improved, leading to improved productivity. Furthermore, the second member and the first member can be appropriately welded with high accuracy, and reliable sealing performance can be obtained. Therefore, an electrochemical cell with high operational reliability and high quality can be obtained.

Further, the electrode body is wound around the column, thereby forming a wound electrode wound around the central axis of the column. In other words, since the winding core used when winding the electrode body is used as a strut, after the electrode body is formed by winding, the electrode body can be housed together with the strut in the container body. Therefore, assembly work can be performed efficiently, and productivity can be improved in this respect as well.

Furthermore , the current collector plate and the second member can be used as external connection terminals.

( 2 ) In the electrochemical cell according to ( 1 ), the support column may be formed of an insulating material.

In this case, for example, there is no need to consider conduction to the current collector plate, the second member, and the electrode body, and the support column can be formed of an inorganic material such as ceramic or an insulating synthetic resin material. In particular, there is no need to consider electrical continuity between the support column and other components. Therefore, the support portion can be designed with fewer restrictions, and the degree of freedom in design can be improved.

( 3 ) In the electrochemical cell described in ( 1 ), the pillar portion may be a conductor. The electrode body and the current collector plate may be electrically connected via the support column by directly contacting the first end of the support column with the current collector plate. The second end portion of the support portion and the second bottom portion may be insulated by contacting each other via an insulator.

In this case, the support column can be used as a conductor. Therefore, for example, one of the positive electrode and the negative electrode in the electrode body wound around the support can be electrically connected to the current collector plate through the support. Therefore, it is easy to reduce the electrical resistance of one electrode, and it is easy to improve battery performance. Furthermore, regarding one electrode, electrical connection can be made by bringing the support portion into contact with the current collector plate, so that the assembly work can be performed more efficiently.

( 4 ) In the electrochemical cell described in ( 1 ), the pillar portion may be a conductor. The first end of the support column and the current collector plate may be insulated by contacting each other via an insulator. The electrode body and the second bottom portion may be electrically connected via the support portion by directly contacting the second end portion of the support portion and the second bottom portion.

In this case, the support column can be used as a conductor. Therefore, for example, the other of the positive electrode and the negative electrode in the electrode body wound around the support can be electrically connected to the second member through the support. Therefore, it is easy to reduce the electrical resistance of the other electrode, and it is easy to improve battery performance. Furthermore, regarding the other electrode, electrical connection can be made by bringing the support portion into contact with the second member, so that the assembly work can be performed even more efficiently.

( 5 ) In the electrochemical cell according to ( 3 ) or ( 4 ), the current collector plate has the sealing material on an outer surface of the first bottom portion facing opposite to the accommodation space in the battery axial direction. The entire surface may be exposed to the outside while being welded through. The support column portion may be in contact with the current collector plate through a through hole formed to penetrate the first bottom portion in the battery axial direction.

In this case, the first end of the support column can be brought into contact with the current collector plate through the through hole, and the first member can be appropriately supported via the current collector plate. In particular, since the current collector plate can be disposed on the outer surface side of the first bottom portion, the current collector plate can be largely exposed to the outside over the entire surface. Therefore, the current collector plate can be effectively used as an external connection terminal, and an electrochemical cell that is easy to use and has excellent mounting properties can be obtained.

( 6 ) In the electrochemical cell according to ( 3 ) or ( 4 ), the current collector plate is welded to the inner surface of the first bottom portion facing the accommodation space via the sealing material, and The first bottom portion may be partially exposed to the outside through a through hole formed to penetrate in the axial direction of the battery.

In this case, since the current collector plate can be disposed on the inner surface side of the first bottom portion, the current collector plate and the first member can be entirely supported using the support portion. Therefore, unintended deflection of the first member can be effectively suppressed. Note that even in this case, since the current collector plate can be partially exposed to the outside through the through hole, the current collector plate can function as an external connection terminal.

( 7 ) The electrochemical cell according to any one of ( 1 ) to ( 6 ) may further include a positioning section that positions the support column in a direction intersecting the battery axis.

In this case, the positioning section can be used to position the support column. Therefore, during assembly work, it is possible to combine, for example, the first member and the support portion without shifting their positions in the direction crossing the battery axis. Furthermore, it is possible to combine the second member and the support portion without shifting the position in the direction crossing the battery axis. Therefore, assembly work can be performed more efficiently and assembly accuracy can be improved.

( 8 ) In the electrochemical cell according to any one of (1) to ( 7 ), the second member may be formed into a bottomed cylindrical shape having the side portion and the second bottom portion. The first member may be welded and joined with the first bottom portion overlapping the upper opening edge of the side portion.

In this case, during assembly work, after the first member is superimposed on the upper opening edge of the side portion of the second member from above, welding can be performed, for example, while pressurizing the first member from above. Therefore, the first member and the second member can be easily welded together firmly, and the inside of the housing space can be sealed with even higher airtightness.

( 9 ) In the electrochemical cell according to any one of (1) to ( 7 ), the second member may be formed into a bottomed cylindrical shape having the side portion and the second bottom portion. The first member may include an inner side portion that extends upward from the outer peripheral edge of the first bottom portion and is welded to overlap the inner side of the side portion. The upper opening edge of the side part and the upper opening edge of the inner side part may face upward.

In this case, during the assembly operation, the first member and the second member can be assembled so that the inner side portion overlaps the side portion of the second member in a double manner in the radial direction. As a result, while the side part and the inner side part are arranged so as to overlap in the radial direction over the entire circumference, the upper end opening edge of the side part and the upper end opening edge of the inner side part are both in the same direction. It can be placed so that it faces Therefore, for example, welding can be performed while approaching from above, and the side portion and the inner side portion can be firmly and easily welded together. Therefore, the inside of the housing space can be sealed with high airtightness. Moreover, it is easy to perform welding work etc. efficiently.

( 10 ) In the electrochemical cell according to ( 9 ), the side portion of the second member includes a first side portion extending upward from the outer peripheral edge of the second bottom portion, and the first side portion. and a second side portion that is bent radially outward from the upper end portion and then extends upward with a larger diameter than the first side portion. The first member may be welded and joined with the inner side portion overlapping the second side portion. The upper opening edge of the second side and the upper opening edge of the inner side may face upward.

In this case, since the second member is formed so that the diameter of the second side portion located above the first side portion is larger, the diameter of the second side portion located above the first side portion is expanded. An annular space can be secured using the difference between the diameter and the diameter of the second side. Thereby, it is possible to effectively utilize the space and arrange external terminals, for example. Therefore, the external terminal can be brought into contact with the first side portion from the side to establish electrical continuity. Therefore, the electrochemical cell can be easily mounted and has excellent mounting performance.
Furthermore, since the first side portion and the second side portion are connected by the bent portion directed outward in the radial direction, the rigidity of the entire side portion can be increased. Therefore, even if the second member is made thin, the strength of the second member can be improved.

Further, when the first member and the second member are combined so that the inner side portion overlaps the second side portion doubly in the radial direction, the first member may be supported using the above-mentioned bent portion. I can do it. Therefore, in combination with the support by the support column, the first member can be supported more stably. Furthermore, while the second side part and the inner side part are arranged so as to overlap in the radial direction over the entire circumference, the upper end opening edge of the second side part and the upper end opening edge of the inner side part are both in the same direction. It can be placed so that it faces upward. Therefore, welding can be performed, for example, while approaching from above, and the second side portion and the inner side portion can be firmly and easily welded together. Therefore, the inside of the housing space can be sealed with high airtightness. In addition, since the second side portion can be formed with a large diameter, heat dissipation during welding can be improved.

( 11 ) In the electrochemical cell according to any one of (1) to ( 10 ), a flat surface extending along the axial direction of the support column may be formed on the outer peripheral surface of the support column. . The separator may be positioned with respect to the support column while being in surface contact with the flat surface.

In this case, when winding the electrode body using the struts, it is possible to position the separator relative to the struts while bringing the separator into surface contact with the flat surface. Therefore, during winding, it is possible to effectively suppress winding misalignment such as misalignment of the relative position of the separator with respect to the strut portion. Therefore, an electrode body with high operational reliability can be obtained, and a high-quality electrochemical cell can be obtained.

( 12 ) In the electrochemical cell according to any one of (1) to ( 10 ), a groove extending along the axial direction of the support column may be formed on the outer peripheral surface of the support column. A pressing member may be removably attached to the groove portion with the separator sandwiched therebetween. The separator may be positioned with respect to the support column by fitting the pressing member into the groove.

In this case, when winding the electrode body using the struts, the separator can be positioned with respect to the struts by installing a pressing member in the groove with the separator sandwiched therebetween. Therefore, during winding, it is possible to suppress occurrence of winding misalignment, such as misalignment of the relative position of the separator with respect to the strut portion. Therefore, an electrode body with high operational reliability can be obtained, and a high-quality electrochemical cell can be obtained.

( 13 ) In the electrochemical cell described in ( 12 ), the pressing member may also serve as a current collecting terminal for the positive electrode or the negative electrode.

In this case, since the holding member can function as a current collecting terminal, the assembly work can be performed more efficiently.

( 14 ) In the electrochemical cell according to any one of (1) to ( 10 ), the support section includes two bifurcated sections facing each other in the radial direction across the central axis of the support section. The first pillar part and the second pillar part may be provided. The separator may be positioned with respect to the column by being inserted between the first column and the second column and being wound around the column.

In this case, when winding the electrode body using the pillar part, by inserting a separator between the first pillar part and the second pillar part and winding it, it is possible to The separator can be positioned by Therefore, during winding, it is possible to suppress occurrence of winding misalignment, such as misalignment of the relative position of the separator with respect to the strut portion. Therefore, an electrode body with high operational reliability can be obtained, and a high-quality electrochemical cell can be obtained.

( 15 ) In the electrochemical cell described in ( 14 ), the first columnar portion and the second columnar portion may be arranged to face each other with a slit portion into which the separator is inserted. The first pillar part and the second pillar part may be deformable so as to close the slit part by winding the electrode body around the pillar part.

In this case, at least the portion of the separator inserted into the slit portion can be held between the first column portion and the second column portion when winding the electrode body around the column portion. Thereby, it is possible to suppress occurrence of winding misalignment such as misalignment of the relative position of the separator with respect to the strut portion during winding. Furthermore, stable conduction between the electrode body and the support portion can be ensured, for example.

Even if the exterior body is made thin, it is possible to obtain an electrochemical cell that can provide reliable sealing performance and also lead to improved productivity.

FIG. 1 is a perspective view showing a first embodiment of a secondary battery (electrochemical cell) according to one aspect of the present invention. FIG. 2 is a longitudinal cross-sectional view of the secondary battery taken along line AA shown in FIG. 1. FIG. 2 is a cross-sectional perspective view of the secondary battery taken along line AA shown in FIG. 1. FIG. FIG. 3 is a step diagram for winding the electrode body shown in FIG. 2 around a support section, and shows a state in which a separator is fixed to the outer peripheral surface of the support section. FIG. 5 is a diagram showing a state in which the strut portion is rotated from the state shown in FIG. 4 and the separator is wound around the strut portion in advance. 6 is a diagram showing a state in which the support column is further rotated from the state shown in FIG. 5 and the negative electrode is wound around the support column in advance together with the separator. FIG. FIG. 5 is a perspective view showing a chuck section that holds the support column shown in FIG. 4; FIG. 2 is a longitudinal cross-sectional view showing a second embodiment of a secondary battery (electrochemical cell) according to one aspect of the present invention. FIG. 7 is a longitudinal cross-sectional view showing a modification of the bulge in the second embodiment. FIG. 7 is a longitudinal cross-sectional view showing a case where a protrusion shaft is formed on the lid member (first member) in the second embodiment. It is a longitudinal cross-sectional view which shows the case where the protrusion cylinder is formed in the lid member (1st member) in 2nd Embodiment. FIG. 3 is a vertical cross-sectional view showing a third embodiment of a secondary battery (electrochemical cell) according to one aspect of the present invention. FIG. 13 is a diagram showing a state in which the negative terminal tab of the negative electrode in the electrode body shown in FIG. 12 is connected to the outer circumferential surface of the support column. FIG. 7 is a longitudinal cross-sectional view of a secondary battery showing a modification of the third embodiment. FIG. 7 is a longitudinal cross-sectional view of a secondary battery showing another modification of the third embodiment. FIG. 7 is a longitudinal cross-sectional view showing a fourth embodiment of a secondary battery (electrochemical cell) according to one aspect of the present invention. 17 is a cross-sectional perspective view of the secondary battery shown in FIG. 16. FIG. FIG. 7 is a longitudinal cross-sectional view of a secondary battery showing a modification of the fourth embodiment. FIG. 7 is a longitudinal cross-sectional view of a secondary battery showing another modification of the fourth embodiment. It is a longitudinal cross-sectional view showing a fifth embodiment of a secondary battery (electrochemical cell) according to one aspect of the present invention. 21 is a cross-sectional perspective view of the secondary battery taken along line BB shown in FIG. 20. FIG. 21 is a longitudinal cross-sectional view of the secondary battery taken along line BB shown in FIG. 20. FIG. FIG. 7 is a vertical cross-sectional view showing a sixth embodiment of a secondary battery (electrochemical cell) according to one aspect of the present invention. FIG. 7 is a longitudinal cross-sectional view showing a seventh embodiment of a secondary battery (electrochemical cell) according to one aspect of the present invention. FIG. 3 is a perspective view showing a state in which the separator welded to the outer circumferential surface of the support column is bent with the welded portion as a base point. It is a perspective view showing an example of a cylindrical support part and a chuck part. FIG. 3 is a perspective view showing a separator attached to a flat surface formed on a support column in surface contact with the separator. FIG. 3 is a perspective view showing a state in which a pressing member is attached with a separator sandwiched inside a groove formed in a support column. FIG. 29 is a perspective view showing a case where the pressing member shown in FIG. 28 is used as a current collecting terminal. FIG. 2 is a perspective view showing an example of a column section having a first column section and a second column section. 31 is a top view showing a state in which a separator is inserted between the first pillar part and the second pillar part shown in FIG. 30. FIG. FIG. 32 is a top view showing a state in which the support pillars are rotated from the state shown in FIG. 31 and separators are wound around the first pillar part and the second pillar part. 33 is a top view showing a state in which the positive electrode and the negative electrode are started to be wound together with the separator from the state shown in FIG. 32. FIG. It is a perspective view which shows another example of a support|pillar part which has a 1st pillar part and a 2nd pillar part. It is a perspective view which shows another example of a support|pillar part which has a 1st pillar part and a 2nd pillar part. It is a perspective view which shows another example of a support|pillar part which has a 1st pillar part and a 2nd pillar part. 37 is a perspective view showing a state in which the electrode body is wound using the support shown in FIG. 36. FIG. 37 is a perspective view showing a modification of the support column shown in FIG. 36. FIG.

(First embodiment)
Embodiments of an electrochemical cell according to the present invention will be described below with reference to the drawings. In this embodiment, a lithium ion secondary battery (hereinafter simply referred to as a secondary battery), which is a type of non-aqueous electrolyte secondary battery, will be exemplified as an electrochemical cell.

As shown in FIGS. 1 to 3, the secondary battery 1 of this embodiment is a so-called button (coin) type battery, and includes a metal exterior body 2 and a power generation element housed inside the exterior body 2. It has 3.

In this embodiment, an axis passing through the center of the exterior body 2 and extending in the vertical direction is referred to as a battery axis O. When viewed in plan from the battery axis O direction, the direction intersecting the battery axis O is called the radial direction, and the direction going around the battery axis O is called the circumferential direction. Further, along the battery axis O, the direction from the bottom wall portion 11 of the container body 10, which will be described later, toward the lid member 20, which will be described later, is referred to as an upper direction, and the opposite direction is referred to as a lower direction.

The exterior body 2 includes a peripheral wall part (side part according to the present invention) 12, a top wall part (first bottom part according to the present invention) 21 and a bottom wall part (second bottom part) 11 facing each other in the direction of the battery axis O. The power generation element 3 including the electrode body 30 is housed in a housing space 5 formed inside.
The power generation element 3 includes an electrode body 30 having a positive electrode 32 and a negative electrode 33 arranged with a separator 31 in between, and contains an electrolytic solution (not shown).

(exterior body)
The exterior body 2 will be explained in detail.
The exterior body 2 includes a lid member (first member according to the present invention) 20 including a top wall portion 21, a bottom wall portion 11, a peripheral wall portion 12, and a container body (welded to the lid member 20). A second member according to the present invention) 10, and a support 4 that is arranged along the battery axis O in the housing space 5 and supports the top wall 21 and the bottom wall 11 in the battery axis O direction. ing.

Specifically, the container body 10 has a bottom wall portion 11 formed in a circular shape in a plan view, and is connected to the bottom wall portion 11 over the entire circumference of the outer peripheral edge of the bottom wall portion 11, and extends upward from the bottom wall portion 11. It is formed in a cylindrical shape with a bottom and a peripheral wall portion 12 that extends.
However, the shape of the container body 10 is not limited to a cylindrical shape with a bottom, and may be formed to have an elliptical, square, or polygonal outer shape when viewed from above, for example.

The container body 10 is made of metal and functions as a positive electrode external connection terminal or a negative electrode external connection terminal electrically connected to the electrode body 30. The thickness of the container body 10 is, for example, approximately 0.01 mm to 0.30 mm, and is a thin metal container. However, in each drawing, the thickness of the container body 10 is exaggerated in order to make the illustrations easier to see.

The specific metal material of the container body 10 varies depending on whether the container body 10 is to function as an external connection terminal for a positive electrode or an external connection terminal for a negative electrode, but for example, aluminum, aluminum alloy, copper, Copper alloy, stainless steel, or a cladding material (highly functional metal material) formed by pressure-bonding metals of the same or different types can be used. However, it is not limited to these cases.
Examples of the stainless steel include ferritic stainless steels such as SUS430 and SUS444, and austenitic-ferritic duplex stainless steels such as SUS329J4L.

Examples of the cladding material include a three-layer cladding material of Cu (inner layer)/Fe (middle layer)/Ni (outer layer), a three-layer cladding material of Ni (inner layer)/Fe (middle layer)/Ni (outer layer), or a three-layer cladding material of Al (inner layer). )/SUS (middle layer)/Ni (outer layer) three-layer cladding material. However, the cladding material is not limited to three layers, and may be formed by pressing other metals together in multiple layers.

When Cu is used as the cladding material, thermal conductivity can be increased, so heat dissipation during welding can be improved. Therefore, it is preferable to use Cu in the inner layer of the cladding material because it can protect the electrode body 30.

Furthermore, it is preferable to perform plating treatment on one or both of the inner and outer surfaces of the cladding material to form a metal plating film.
By forming a metal plating film on the inner surface of the container body 10, chemical stability can be achieved. Therefore, resistance to electrolytes and the like can be improved.
By forming a metal plating film on the outer surface of the container body 10, functions such as rust prevention can be added, and electrical resistance can be reduced. Therefore, electrical connectivity with external terminals can be improved.

In addition, as a specific metal plating film, for example, a Ni plating film, an alloy plating film such as Ni, etc. can be adopted. In particular, it is preferable to use an alloy plating film made of a eutectic metal material. When an alloy plating film of a eutectic metal material is employed, the melting point can be lowered during resistance welding, for example. Therefore, it is possible to lower the temperature during welding.
In addition, an Au-Ni alloy plating film, a Ni-P alloy plating film, a Ni-B alloy plating film, etc. can also be suitably employed.

For example, when the secondary battery 1 of this embodiment is used for a watch, the metal material of the container body 10 is preferably corrosion resistant and non-magnetic.
Specifically, in addition to the above-mentioned aluminum, aluminum alloy, copper, and copper alloy, examples of stainless steel include various austenitic stainless steels such as SUS201, SUS202, SUS303, SUS304, SUS305, SUS316, SUS317, SUS321, and SUS347. can be mentioned.
Furthermore, the container body 10 may be made of a material in which a resin layer is formed on the surface of the various metals mentioned above. For example, a laminate film in which a metal layer made of stainless steel and a film-like resin layer are laminated can be used. In this case, the opening of the container body 10 can be closed by joining the metal lid member 20 and the metal layer of the container body 10. As the resin layer, for example, a resin material used for the sealant film 40 described later can be used.

As shown in FIGS. 2 and 3, the lid member 20 is formed into a capped cylindrical shape including a top wall portion 21 and an inner peripheral wall portion (inner side portion according to the present invention) 22. As shown in FIGS.
The top wall portion 21 is formed into a circular shape in a plan view, and is arranged to face the bottom wall portion 11 of the container body 10 in the direction of the battery axis O with the electrode body 30 interposed therebetween. The inner circumferential wall 22 is continuous over the entire circumference of the outer circumferential edge of the top wall 21 and extends upward from the top wall 21 .

Note that the shape of the lid member 20 should just correspond to the shape of the container body 10. For example, the lid member 20 may be formed to have an elliptical, square, or polygonal outer shape when viewed from above, corresponding to the shape of the container body 10. Like the container body 10, the thickness of the lid member 20 is, for example, about 0.01 mm to 0.30 mm, and is thin. However, in each drawing, the thickness of the lid member 20 is exaggerated in order to make the illustrations easier to see.

In the lid member 20, the top wall portion 21 is located below the upper end opening edge of the peripheral wall portion 12 of the container body 10, and the upper end opening edge of the peripheral wall portion 12 and the upper end opening edge of the inner peripheral wall portion 22 are flush with each other. It is arranged inside the peripheral wall part 12 so that it becomes like this. Thereby, the inner circumferential wall portion 22 is welded to the inner side of the circumferential wall portion 12 of the container body 10 in a double overlapping state in the radial direction.

The peripheral wall portion 12 and the inner peripheral wall portion 22 are firmly joined by welding over the entire circumference. As a result, the opening of the container body 10 can be closed using the lid member 20, and an accommodation space (sealed space) 5 is formed between the lid member 20 and the container body 10 to accommodate the support column 4 and the power generation element 3. There is.

The method of welding the container body 10 and the lid member 20 is not particularly limited, but includes, for example, laser welding, ultrasonic welding, resistance welding such as seam welding, friction stir welding (FSW), etc. Can be adopted.
During these welding operations, a so-called work move method may be used, in which welding is performed while moving the exterior body 2 side, which is the workpiece to be welded, while the welder side (not shown) is fixed. Alternatively, a so-called head movement method may be used in which the exterior body 2 side, which is the work to be welded, is fixed and welding is performed while moving the welder side. For example, when laser welding is performed using a head-moving method, it is possible to employ a galvano scanning laser welder or the like.

A through hole 23 is formed in the center of the lid member 20 and coaxially with the battery axis O, passing through the lid member 20 in the vertical direction. Although the shape of the through hole 23 is not particularly limited, it is formed, for example, in a circular shape in a plan view.

The lid member 20 configured in this manner is made of metal. As a specific metal material for the lid member 20, for example, the same kind of metal material as the container body 10 or a different kind of metal material can be adopted. For example, when a metal material different from the container body 10 is used as the metal material of the lid member 20, it is preferable to use a metal material having a coefficient of thermal expansion similar to that of the container body 10.
Furthermore, similarly to the container body 10, the lid member 20 is preferably plated on either the inner surface or the outer surface, or both the inner surface and the outer surface to form a metal plating film. As the metal plating film, the metal plating film described above can be used.

(current collector plate)
As shown in FIGS. 1 to 3, the lid member 20 configured as described above is thermally welded (welded) through a sealant film (insulating sealing material according to the present invention) 40, and at least a portion of the lid member 20 is A current collector plate 41 exposed to the outside (upper side) is provided.
Specifically, the sealant film 40 and the current collector plate 41 are arranged on the upper surface (outer surface) of the top wall portion 21 of the lid member 20 facing away from the housing space 5 in the direction of the battery axis O. The current collector plate 41 is thermally welded to the upper surface of the top wall portion 21 via the sealant film 40, and is exposed upward over the entire surface.

The sealant film 40 is formed in an annular shape surrounding the through hole 23 formed in the top wall part 21, and is arranged so as to overlap the upper surface of the top wall part 21 while being arranged coaxially with the battery axis O. In the illustrated example, the sealant film 40 is formed with an inner diameter smaller than the diameter of the through hole 23. However, the present invention is not limited to this case, and the inner diameter of the sealant film 40 may be equal to or larger than the diameter of the through hole 23.

The sealant film 40 is made of, for example, a polyolefin thermoplastic resin or an engineering plastic such as polyphenylene sulfide (PPS). Examples of polyolefins include polyethylene, polypropylene, polybutene, and the like.
Furthermore, as the sealant film 40, a composite such as a copolymer of each of the above-mentioned polyolefins, a blend polymer, or polypropylene reinforced with a nonwoven fabric may be used. Furthermore, a plurality of sealant films 40 having different sizes, shapes, or thicknesses may be stacked and used.

The current collector plate 41 is a metal plate, and is electrically connected to the electrode body 30. Thereby, the current collector plate 41 functions as a positive electrode external connection terminal or a negative electrode external connection terminal electrically connected to the electrode body 30. In the illustrated example, the current collector plate 41 is formed into a circular shape in a plan view with a diameter smaller than the outer diameter of the sealant film 40, and is arranged coaxially with the battery axis O so as to overlap the upper surface of the sealant film 40. It is located. Thereby, the current collector plate 41 closes the through hole 23 from above.

The material of the current collector plate 41 is not particularly limited, but for example, nickel or the like can be suitably used. Furthermore, a metal plated film made of a good conductive material such as gold or nickel, or an alloy plating film containing these metals may be formed on the externally connectable surface of the current collector plate 41.

The above-described sealant film 40 is heat-welded to the upper surface of the top wall portion 21 and the lower surface of the current collector plate 41, respectively. As a result, the current collector plate 41 is thermally fused to the upper surface of the top wall portion 21 via the sealant film 40, and the through hole 23 is hermetically sealed from above while maintaining insulation between the current collector plate 41 and the lid member 20. are doing. In particular, the current collector plate 41 is integrally combined with the lid member 20 via the sealant film 40.

The sealant film 40 insulates the current collector plate 41 and the container body 10. In the secondary battery 1 of the present embodiment, the current collector plate 41 and the container body 10 are in contact with a contact pressure terminal, a holder, etc. of an electronic device (not shown), so that the positive terminal and the negative terminal of the electronic device are connected to each other. It can be electrically connected to any of the terminals. Note that after welding a metal terminal to at least one of the current collector plate 41 and the container body 10, the terminal may be electrically connected to an electronic device by soldering, welding, or the like.

(pillar part)
As shown in FIGS. 2 and 3, the support 4 is housed together with the power generation element 3 in the housing space 5 of the exterior body 2. As shown in FIGS.
The support column 4 is formed into a shaft shape that extends in the vertical direction along the battery axis O, and is arranged coaxially with the battery axis O. In the illustrated example, the support column 4 is formed into a hollow cylindrical shape, and its outer diameter is smaller than the diameter of the through hole 23 and the inner diameter of the sealant film 40. As a result, the upper end (the first end according to the present invention) of the support column 4 directly contacts the current collector plate 41 from below through the through hole 23, and the lower end (the second end according to the present invention) directly contacts the current collector plate 41 from below. The bottom wall 11 of the container body 10 is disposed such that the bottom wall 11 of the container body 10 is in direct contact with the bottom wall 11 of the container body 10 from above.
Therefore, the support column 4 supports the current collector plate 41 that is integrally combined with the lid member 20 from below. That is, the support column 4 supports the lid member 20 from below via the current collector plate 41.

The support column 4 of this embodiment is made of an insulating material such as an inorganic material such as ceramic or a synthetic resin material. When the support column 4 is made of synthetic resin, a thermoplastic resin having a melting point similar to that of the separator 31 can be suitably used, for example. Specifically, materials such as synthetic resins such as PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), and PBT (polybutylene terephthalate) can be used. Furthermore, copolymers and blend polymers of these synthetic resins can also be used.
This allows electrical connection between the container body 10 and the current collector plate 41 through the support portion 4, electrical connection between the current collector plate 41 and the electrode body 30 through the support portion 4, or electrical connection between the container body through the support portion 4. Electrical connection between 10 and the electrode body 30 can be suppressed.

(power generation element)
As shown in FIGS. 2 and 3, the power generation element 3 includes an electrode body 30 and an electrolytic solution (not shown), and is housed in a housing space 5 in a sealed state together with the above-mentioned support 4.
As the electrolytic solution, for example, a liquid in which a supporting salt is dissolved in a non-aqueous solvent can be suitably used. As the supporting salt, for example, lithium fluorophosphate (LiPF6) can be used. As the solvent, for example, a low boiling point solvent can be used together with ethylene carbonate (EC).

However, the power generation element 3 may employ an electrode body using an electrolyte such as a solid electrolyte, a polymer electrolyte, a gel electrolyte, etc., instead of the electrolyte. Examples of the polymer electrolyte include polyethylene oxide (PEO), polypropylene oxide (PPO), blend polymers containing these, polyacrylic esters, polymethacrylic esters, polysiloxanes, polyphosphazenes, and the like. A gel electrolyte containing poly(vinylidene fluoride-co-hexafluoropropylene, PVdF-HFP) may be used as the electrolyte.

(electrode body)
As shown in FIG. 2, the electrode body 30 has a positive electrode 32 and a negative electrode 33 arranged with a separator 31 in between, and is a wound electrode that is wound multiple times around the battery axis O.
Specifically, the electrode body 30 is wound around the support portion 4 with the positive electrode 32 and the negative electrode 33 superimposed on each other with the separator 31 in between. Thereby, the electrode body 30 is configured to be wound multiple times in the radial direction around the central axis C (see FIG. 4) of the support column 4 arranged coaxially with the battery axis O. Therefore, the support column 4 also functions as a winding core when winding the electrode body 30.

The electrode body 30 is wound in a multiple spiral shape around the battery axis O (the central axis C of the support portion 4) when viewed in plan from the direction of the battery axis O.
In this embodiment, from the innermost layer of the electrode body 30 located on the side of the support 4 to the outermost layer located on the side of the peripheral wall 12 of the container body 10, a negative electrode 33, a separator 31, a positive electrode 32, a separator 31 The electrode body 30 is wound so that the negative electrode 33, the separator 31, and the positive electrode 32 are repeatedly arranged in this order.
Note that the electrode body 30 may be, for example, a so-called pellet-type electrode body that includes a positive electrode 32 and a negative electrode 33 on both sides of a separator 31. Note that in each drawing other than FIG. 2, the illustration of the electrode body 30 is simplified.

As shown in FIG. 4, the positive electrode 32 is formed into a single sheet in the unfolded state before the electrode body 30 is wound. Specifically, the positive electrode 32 includes a long positive current collector (positive current collector foil) 32a formed to extend in a strip shape with a constant width, and a coating etc. on one or both sides of the positive current collector 32a. and a positive electrode active material layer 32b formed by.

The positive electrode current collector 32a is formed into a thin sheet (metal foil) of a metal material such as aluminum, aluminum alloy, or stainless steel. The thickness of the positive electrode current collector 32a is, for example, about several μm to 10-odd μm. The positive electrode active material layer 32b is formed in a portion of the positive electrode current collector 32a excluding a positive electrode terminal tab 32c, which will be described later.
In addition to metal foil, for example, etched foil, punched metal, sintered metal, or foamed metal can be used as the positive electrode current collector 32a.

In addition to the positive electrode active material, the material for forming the positive electrode active material layer 32b may include conductive additives (for example, carbon black, graphite, etc.), binders (for example, polyvinylidene fluoride, etc.), and solvents (for example, N-methylpyrrolidone, etc.). (solvent) can be mixed to prepare a positive electrode slurry.
Note that the coating liquid containing constituent materials for forming the positive electrode active material layer 32b is referred to as "positive electrode slurry." The positive electrode active material layer 32b can be formed by applying this positive electrode slurry to the positive electrode current collector 32a and drying it.
As a positive electrode active material, for example, nickel-manganese-lithium cobalt oxide (NMC), nickel-cobalt-lithium aluminate (NCA), lithium titanate (LTO), lithium manganate (LMO), etc. Examples include composite oxides containing metals.

A positive terminal tab 32c is formed at one end of the positive electrode current collector 32a located on the side away from the support 4. As described above, the positive electrode terminal tab 32c does not have the positive electrode active material layer 32b formed thereon, and can be electrically connected to other components. The positive electrode terminal tab 32c is arranged on the outer layer side of the electrode body 30 when the electrode body 30 is wound.

As shown in FIG. 4, the negative electrode 33 is formed into a single sheet in the unfolded state before the electrode body 30 is wound. Specifically, the negative electrode 33 includes a long negative current collector (negative current collector foil) 33a formed to extend in a strip shape with a constant width, and a coating etc. on one or both sides of the negative current collector 33a. and a negative electrode active material layer 33b formed by.

The negative electrode current collector 33a is formed into a thin sheet (metal foil) of a metal material such as copper, copper alloy, nickel, and stainless steel. The thickness of the negative electrode current collector 33a is, for example, about several μm to 10-odd μm. The negative electrode active material layer 33b is formed in a portion of the negative electrode current collector 33a excluding a negative electrode terminal tab 33c, which will be described later.
For the negative electrode current collector 33a, in addition to metal foil, for example, etched foil, punched metal, sintered metal, or foamed metal can be used.

In addition to the negative electrode active material, the materials for forming the negative electrode active material layer 33b include a conductive additive (for example, carbon black, graphite, etc.), a binder (for example, a dispersion of styrene-butadiene rubber (SBR), etc.), and a thickener ( For example, a negative electrode slurry can be prepared by mixing cellulose nano fibers (CNF, carboxymethyl cellulose, etc.) and a solvent (for example, any solvent such as pure water).
Note that the coating liquid containing constituent materials for forming the negative electrode active material layer 33b is referred to as "negative electrode slurry." The negative electrode active material layer 33b can be formed by applying this negative electrode slurry to the negative electrode current collector 33a and drying it.
Examples of the negative electrode active material include silicon, silicon oxide, graphite, hard carbon, lithium titanate (LTO), LiAl, and the like alone or in mixtures.

A negative electrode terminal tab 33c is formed at one end of the negative electrode current collector 33a located on the side away from the support column 4. As described above, the negative electrode terminal tab 33c does not have the negative electrode active material layer 33b formed thereon, and can be electrically connected to other components. The negative electrode terminal tab 33c is arranged on the outer layer side of the electrode body 30 when the electrode body 30 is wound.

The separator 31 shown in FIG. 4 is formed of, for example, a microporous film made of resin such as polyolefin, a nonwoven fabric made of glass or resin, a laminate of fibers such as cellulose fiber, or the like. The separator 31 is capable of passing lithium ions through ion permeation holes (not shown). Further, as the separator 31, for example, a porous body capable of retaining an electrolyte in its pores, a resin layer having lithium ion conductivity, or the like can be employed.

The separator 31 is disposed entirely between the layers of the positive electrode 32 and the negative electrode 33, and provides insulation between the positive electrode 32 and the negative electrode 33. Therefore, the separator 31 is disposed to be interposed between the positive electrode 32 and the negative electrode 33 at least in the entire region where the positive electrode 32 and the negative electrode 33 face each other.

As shown in FIG. 2, the electrode body 30 configured as described above is integrated with the support 4 by being wound around the support 4. The electrode body 30 is a wound electrode in which a positive electrode 32 and a negative electrode 33 are wound in multiple layers in the radial direction around the central axis C of the support portion 4 with a separator 31 sandwiched therebetween. Become.

In addition, in the electrode body 30 housed together with the support column 4 in the accommodation space 5, one of the positive electrode 32 and the negative electrode 33 is electrically connected to the current collector plate 41, and the other electrode is electrically connected to the current collector plate 41. It is electrically connected to the container body 10. Note that the electrical connection includes, for example, contact via a carbon-based material, welding between metals, contact between metals, and the like.

In this embodiment, the negative electrode 33 is electrically connected to the current collector plate 41, and the positive electrode 32 is electrically connected to the container body 10. Thereby, the current collector plate 41 can function as an external connection terminal for the negative electrode, and the container body 10 can function as an external connection terminal for the positive electrode.
However, the present invention is not limited to this case, and by making the negative electrode 33 conductive to the container body 10, the container body 10 may function as an external connection terminal for the negative electrode. Furthermore, by connecting the positive electrode 32 to the current collecting plate 41, the current collecting plate 41 may function as an external connection terminal for the positive electrode.

When the negative electrode 33 is electrically connected to the current collector plate 41, for example, the negative terminal tab 33c may be directly electrically connected to the current collector plate 41, or it may be electrically connected to the current collector plate 41 through a conductor equivalent to a lead wire (not shown). The negative electrode terminal tab 33c and the current collector plate 41 may be electrically connected.
Similarly, when the positive electrode 32 is electrically connected to the container body 10, for example, the positive terminal tab 32c may be directly electrically connected to the container body 10, or a conductor corresponding to a lead wire (not shown) may be used. The positive electrode terminal tab 32c and the container body 10 may be electrically connected via the positive electrode terminal tab 32c.

(Formation of electrode body)
A case in which the electrode body 30 is formed using the support column 4 as a winding core will be described below.
First, as shown in FIG. 4, a separator 31, a positive electrode 32, and a negative electrode 33 are prepared, and then the separator 31 is welded to the outer peripheral surface of the support column 4. Thereby, the welded part 42 formed by welding the outer circumferential surface of the column part 4 and the separator 31 to each other can be used as a positioning part. Thereby, the separator 31 can be positioned with respect to the support column 4.

Note that when the length of the separator 31 is determined in advance, a portion shifted toward the region R1 side where the positive electrode 32 is overlapped with respect to the center portion of the separator 31 in the length direction is placed on the outer peripheral surface of the support portion 4. Weld. Thereby, it is possible to secure a larger region R2 of the separator 31 where the negative electrode 33 is overlapped than the region R1 where the positive electrode 32 is overlapped.

Next, the support portion 4 is rotated around the central axis C as indicated by an arrow M shown in FIG. At this time, the strut portion 4 is rotated so that the region R2 of the separator 31 where the negative electrode 33 is overlapped is wrapped around the strut portion 4 first.
Next, as shown in FIG. 5, the separator 31 and the negative electrode 33 are overlapped so that the negative electrode 33 is inserted between the separator 31 that was wrapped before the pillar part 4 and the pillar part 4. At this time, the negative electrode 33 is inserted until it hits the welded part 42 as indicated by the arrow S shown in FIG. In this state, the support column 4 is further rotated as shown in FIG. Thereby, the negative electrode 33 can be wound around the support portion 4 in advance. Therefore, the innermost layer as the electrode body 30 can be formed of the negative electrode 33.

Further, while superimposing the positive electrode 32 on the separator 31, the support section 4 is continuously rotated, so that the separator 31, the positive electrode 32, and the negative electrode 33 are wound around each other. As a result, as shown in FIG. 2, an electrode body 30 wound around the support 4 can be manufactured.
Note that since the negative electrode 33 is wound before the support 4, it is preferable that the negative electrode 33 be formed to be longer than the positive electrode 32.

Note that when the electrode body 30 is wound using the support 4 as a winding core, a winding machine (not shown) can be used. In this case, the winding machine includes a chuck section 50 that can detachably hold the support column 4 and is rotatable around the central axis C of the support column 4, as shown in FIG. 7, for example.

The chuck section 50 has a first chuck section 51 and a second chuck section 52 arranged on both sides of the support column 4. The first chuck part 51 and the second chuck part 52 are arranged coaxially with the central axis C.
The first chuck part 51 and the second chuck part 52 are movable toward and away from the support column 4 along the central axis C, respectively. Furthermore, the first chuck part 51 and the second chuck part 52 have protrusions 51 a and 52 a that protrude toward the support column 4 and have tapered cross sections. The protrusions 51a and 52a are capable of entering into the opening of the cylindrical support portion 4.

Thereby, the support column 4 can be sandwiched from both sides in the direction of the central axis C using the first chuck part 51 and the second chuck part 52. Furthermore, it is possible to center the support portion 4 so that the first chuck portion 51, the second chuck portion 52, and the support portion 4 are aligned on the central axis C. Therefore, by using the chuck section 50, the support section 4 can be rotated with high precision around the central axis C while suppressing rotational wobbling and the like. Therefore, it is possible to wrap the electrode body 30 around the support column 4 with high precision.

(Effect of secondary battery)
According to the secondary battery 1 configured as described above, as shown in FIGS. 1 to 3, the current collector plate 41 functioning as an external connection terminal for the negative electrode is exposed to the outside. Furthermore, the container body 10, which functions as an external connection terminal for the positive electrode, is exposed to the outside. Therefore, it becomes possible to use the secondary battery 1 by using the current collector plate 41 and the container body 10.

In particular, according to the secondary battery 1 of this embodiment, the support portion 4 is housed in the housing space 5 in addition to the electrode body 30 . The support column 4 is arranged such that its upper end contacts the current collector plate 41 from below through the through hole 23, and its lower end contacts the bottom wall 11 of the container body 10 from above. Thereby, the current collector plate 41 can be supported from below using the support portion 4. Moreover, since the current collector plate 41 is welded to the lid member 20 via the sealant film 40, it is combined integrally with the lid member 20. Therefore, the support portion 4 can support the lid member 20 from below via the current collector plate 41.

Therefore, even if the entire exterior body 2 including the lid member 20 is formed to have a thin wall, unintended deformation such as bending of the lid member 20 may occur before the container body 10 and the lid member 20 are welded together. Can be suppressed. Therefore, the welding work can be performed while suppressing the displacement of the lid member 20 with respect to the container body 10. Therefore, work efficiency can be improved, leading to improved productivity. Furthermore, the container body 10 and the lid member 20 can be appropriately welded with high accuracy, and reliable sealing performance can be obtained. Therefore, it is possible to obtain a high-quality secondary battery 1 with high operational reliability.

Furthermore, the electrode body 30 is wound around the support 4, so that the positive electrode 32 and the negative electrode 33 are overlapped with each other with the separator 31 in between, and the wound electrode is wound around the central axis C of the support 4. becomes. That is, the support portion 4 is used as a winding core when winding the electrode body 30. Therefore, after forming the electrode body 30 by winding, the electrode body 30 can be housed in the container body 10 together with the support portion 4 . Therefore, assembly work can be performed efficiently. Therefore, productivity can be improved in this respect as well.

As explained above, according to the secondary battery 1 of the present embodiment, even if the outer casing 2 is made thin, reliable sealing performance can be obtained and productivity can be improved. .
Furthermore, since the support column 4 is made of an insulating material, the support column 4 can be formed without considering conduction to the current collector plate 41, the container body 10, and the electrode body 30. Therefore, it is easy to freely design the support portion 4 with few restrictions, and the degree of freedom in design can be improved.
Furthermore, since the current collector plate 41 is arranged on the upper surface of the lid member 20, the current collector plate 41 can be largely exposed over the entire surface. Therefore, it is easy to effectively use the current collector plate 41 as an external connection terminal for the negative electrode. Therefore, it is possible to provide a secondary battery 1 that is easy to use and has excellent mounting properties.

Furthermore, in the secondary battery 1 of this embodiment, when the container body 10 and the lid member 20 are formed of the above-mentioned cladding material, or when the container body 10 and the lid member 20 are subjected to plating treatment, etc. For example, when the internal pressure increases due to heat generation in the secondary battery 1 due to some factor, it is also possible to take a fail-safe measure such as peeling off the metal interface and releasing the internal pressure to the outside.

(Method for manufacturing secondary batteries)
Next, an example of a method for manufacturing the secondary battery 1 of the first embodiment will be briefly described below.
In addition, although the said 1st Embodiment demonstrated the case where the current collector plate 41 and the lid member 20 were heat-sealed via the sealant film 40, it is not limited to this case. For example, the sealant film 40 may be a single synthetic resin layer, or may be formed by joining multiple synthetic resin layers. Furthermore, the sealant film 40 may be a sealing material made of an inorganic material such as ceramic or glass.
In the first manufacturing method and the second manufacturing method described below, a case where the sealant film 40 is made by heat-sealing a first sealing material and a second sealing material made of synthetic resin to each other is exemplified.

<First manufacturing method>
First, a step is performed in which a first sealing material is superimposed on the lower surface of the current collector plate 41 and the two are integrally assembled by thermal welding. Thereby, a current collecting plate assembly in which the current collecting plate 41 and the first sealing material are integrally combined can be obtained.
At the same time as this step, or before or after this step, a step is performed in which a second sealing material is superimposed on the upper surface of the top wall portion 21 of the lid member 20 and the two are combined into one body by heat fusion. Thereby, a lid member assembly in which the lid member 20 and the second sealing material are integrally combined can be obtained.

After the above two steps are completed, the current collector plate assembly and the lid member assembly are combined so that the first sealant and the second sealant overlap, and then the first sealant and the second sealant are heated together. Perform the process of fusing. Thereby, the current collector plate 41 and the lid member 20 can be integrally combined via the sealant film 40 in which the first sealing material and the second sealing material are integrated by heat fusion.

Simultaneously with, or before or after the above-mentioned process, a step of forming the electrode body 30 by winding the separator 31, the positive electrode 32, and the negative electrode 33 around the pillar part 4, using the pillar part 4 as a winding core. I do. In this step, the method for forming the electrode body 30 described above can be adopted.

Next, the upper end of the support column 4 around which the electrode body 30 is wound is brought into contact with the lower surface of the current collector plate 41, and a step of assembling both together by various welding methods or the like is performed. Thereby, it is possible to obtain an electrode assembly in which the support column 4 around which the electrode assembly 30 is wound and the lid member 20 are integrally combined with the current collector plate 41 interposed therebetween.

Next, after pouring the electrolyte into the container body 10, a step of accommodating the electrode assembly inside the container body 10 filled with the electrolyte solution is performed. Thereby, the lid member 20 can be fitted inside the peripheral wall portion 12 of the container body 10 while supporting the lid member 20 from below using the support portion 4. Furthermore, in a state where the upper end opening edge of the peripheral wall part 12 in the container body 10 and the upper end opening edge of the inner peripheral wall part 22 in the lid member 20 are flush with each other, the peripheral wall part 12 of the container body 10 and the inner peripheral wall of the lid member 20 22 can be overlapped in a double manner in the radial direction.

Finally, a step of welding the peripheral wall portion 12 and the inner peripheral wall portion 22 together over the entire circumference is performed. In this step, as described above, laser welding, ultrasonic welding, resistance welding such as seam welding, friction stir welding, etc. can be employed. Thereby, the container body 10 and the lid member 20 can be welded together. Thereby, the housing 2 can be made into a sealed housing space 5 in which the electrode body 30 and the support column 4 are housed. As a result, the secondary battery 1 shown in FIGS. 1 to 3 can be manufactured.

In particular, when performing the above-described welding work, the upper opening edge of the peripheral wall portion 12 and the upper opening edge of the inner peripheral wall portion 22 both face upward, which is the same direction. Therefore, laser welding can be performed, for example, while approaching from above. Therefore, the peripheral wall portion 12 and the inner peripheral wall portion 22 can be firmly and easily welded together, for example, by butt welding or the like. Thereby, the inside of the housing space 5 can be sealed with high airtightness. Furthermore, it is easy to perform welding work efficiently.
Furthermore, it is also possible to perform seam welding (electric resistance welding) while sandwiching the circumferential wall portion 12 and the inner circumferential wall portion 22, which overlap in the radial direction, between, for example, roller electrodes.

<Second manufacturing method>
Next, a second manufacturing method will be described in which the secondary battery 1 is manufactured in a different process order from the first manufacturing method.
First, a step is performed to form the electrode body 30 by winding the separator 31, the positive electrode 32, and the negative electrode 33 around the pillar part 4 using the pillar part 4 as a winding core. In this step, the method for forming the electrode body 30 described above can be adopted.
Next, after pouring the electrolyte into the container body 10, a step of accommodating the support column 4 around which the electrode body 30 is wound is carried out inside the container body 10 filled with the electrolyte.

Simultaneously with or before or after the above step, a step is performed in which the first sealing material is superimposed on the lower surface of the current collector plate 41 and the two are combined into one body by thermal welding. Thereby, a current collecting plate assembly in which the current collecting plate 41 and the first sealing material are integrally combined can be obtained.
At the same time as this step, or before or after this step, a step is performed in which a second sealing material is superimposed on the upper surface of the top wall portion 21 of the lid member 20 and the two are combined into one body by heat fusion. Thereby, a lid member assembly in which the lid member 20 and the second sealing material are integrally combined can be obtained.

After the above two steps are completed, the current collector plate assembly and the lid member assembly are combined so that the first sealant and the second sealant overlap, and then the first sealant and the second sealant are heated together. Perform the process of fusing. Thereby, the current collector plate 41 and the lid member 20 can be integrally combined via the sealant film 40 in which the first sealing material and the second sealing material are integrated by heat fusion.

Next, the lid member 20 is assembled to the container body 10 so that the upper end of the support column 4 housed inside the container body 10 and the current collector plate 41 are in contact with each other. Thereby, the lid member 20 can be fitted inside the peripheral wall portion 12 of the container body 10 while supporting the lid member 20 from below using the support portion 4. Thereby, in a state where the upper end opening edge of the peripheral wall 12 in the container body 10 and the upper end opening edge of the inner peripheral wall 22 in the lid member 20 are flush with each other, the peripheral wall 12 of the container body 10 and the inner side of the lid member 20 are made flush with each other. The peripheral wall portion 22 can be overlapped in a double manner in the radial direction.

Next, a process is performed in which the current collector plate 41 and the upper end of the support column 4, which are in contact with each other, are assembled together by various welding methods or the like. Note that this step is not essential and may be omitted.

Finally, a step of welding the peripheral wall portion 12 and the inner peripheral wall portion 22 together over the entire circumference is performed. In this step, as described above, laser welding, ultrasonic welding, resistance welding such as seam welding, friction stir welding, etc. can be employed. Thereby, the container body 10 and the lid member 20 can be welded together. Thereby, the housing 2 can be made into a sealed housing space 5 in which the electrode body 30 and the support column 4 are housed.
As a result, the secondary battery 1 shown in FIGS. 1 to 3 can be manufactured. Note that the excellent effects during welding are the same as those of the first manufacturing method.

Although the first manufacturing method and the second manufacturing method have been described above as examples of manufacturing methods for the secondary battery 1, the present invention is not limited to these methods.
Furthermore, as described above, in the first manufacturing method and the second manufacturing method, the sealant film 40 was formed by heat-sealing the first sealing material and the second sealing material. ) may be used.
In this case, there is no need to separately produce a current collector plate assembly and a lid member assembly, and it is sufficient to integrally combine the current collector plate 41 and the lid member 20 with one sheet of sealant film 40 interposed therebetween.

(Modified example of the first embodiment)
In the first embodiment, the upper end of the support column 4 made of an insulating material and the lower surface of the current collector plate 41 only need to be in contact with each other. For example, as explained in the first manufacturing method and the second manufacturing method, it is not necessary to integrally combine the support column 4 and the current collector plate 41 by welding or the like.
However, when the strut part 4 and the current collector plate 41 are integrally combined by welding or the like, before welding the container body 10 and the lid member 20, temporary fixation such as pressing the lid member 20 from above may be performed. This is preferable since it is not necessary to do so.

In the first embodiment, when winding the electrode body 30 around the support column 4, as shown in FIG. Although the separator 31 is prevented from being displaced relative to the welded portion 42, the present invention is not limited to the welded portion 42.
For example, the separator 31 may be adhesively fixed to the outer circumferential surface of the support column 4 using an adhesive to prevent the separator 31 from shifting relative to the support column 4 .

(Second embodiment)
Next, a second embodiment of the electrochemical cell according to the present invention will be described with reference to the drawings. In addition, in this 2nd embodiment, the same code|symbol is attached|subjected about the same component as a 1st embodiment, and the description is abbreviate|omitted.

As shown in FIG. 8, the secondary battery (electrochemical cell according to the present invention) 60 of this embodiment is placed in the housing space 5 with the support 4 positioned relative to the lid member 20 and the container body 10. The support column 4 and the electrode body 30 are housed therein.
A protrusion (positioning part according to the present invention) 61 that extends upward is formed in the center of the bottom wall 11 of the container body 10 of this embodiment. In the illustrated example, the protrusion 61 is formed to bulge upward into a hemispherical shape. The protrusion 61 is arranged coaxially with the battery axis O, and enters into the lower end opening of the support column 4 from below. As a result, the support column 4 is prevented from shifting in the radial direction intersecting the battery axis O with respect to the bottom wall 11. Thereby, the support portion 4 is positioned in the radial direction with respect to the bottom wall portion 11.
In addition to the hemispherical shape shown in FIG. 8, the shape of the protrusion 61 can be various shapes such as a cylindrical shape, a prismatic shape, a conical shape, and a pyramidal shape.

Furthermore, a cylindrical bulge portion (positioning portion according to the present invention) 62 is formed in the center of the current collector plate 41 of this embodiment. In the illustrated example, the bulging portion 62 is formed into a circular shape in plan view having an outer diameter equivalent to the diameter of the through hole 23 formed in the lid member 20. Further, the bulging portion 62 is formed to swell to a height that slightly protrudes above the upper opening edge of the peripheral wall portion 12 of the container body 10.

The support column 4 is formed longer upwardly than in the first embodiment. The support column 4 enters inside the bulge 62 from below and contacts the top wall of the bulge 62 from below. In this way, by the support 4 entering the inside of the bulge 62 from below, the support 4 is prevented from shifting in the radial direction intersecting the battery axis O with respect to the current collector plate 41. . Therefore, the support column 4 is positioned in the radial direction with respect to the lid member 20 that is integrally combined with the current collector plate 41.

(Effect of secondary battery)
Even the secondary battery 60 of this embodiment configured as described above can achieve the same effects as the first embodiment.
In addition, the protrusion 61 and the bulge 62 can be used to position the support column 4. Therefore, during assembly work, the lid member 20 and the support section 4 can be assembled without being displaced in the radial direction. Furthermore, the container body 10 and the support column 4 can be combined without being displaced in the radial direction. Therefore, assembly work can be performed more efficiently and assembly accuracy can be improved.

Further, when an external terminal (not shown) is welded to the current collecting plate 41 in order to extract electricity, welding is performed while pressing the external terminal against the current collecting plate 41. At this time, the existence of the support column 4 positioned relative to the lid member 20 and the container body 10 can prevent the load caused by the pressing of the external terminal from affecting the internal structure of the battery.

In the second embodiment, the protrusion 61 formed on the bottom wall 11 and the bulge 62 formed on the current collector plate 41 are used to attach the support to each of the container body 10 and the lid member 20. 4, but the present invention is not limited to this case. For example, the support portion 4 may be positioned relative to at least one of the container body 10 and the lid member 20.

(Modified example of second embodiment)
In the second embodiment, as shown in FIG. 9, the inner diameter of the bulging portion 62 may be formed to be equal to or slightly smaller than the outer diameter of the support portion 4. Thereby, the bulging portion 62 can be tightly fitted (for example, interference fit) to the outside of the upper end portion of the support portion 4 by press-fitting or the like.
With this configuration, it is possible to position the support 4 with respect to the current collector 41 while physically fixing the current collector 41 and the support 4. Furthermore, depending on the presence or absence of the bulge 62, the upper surface and lower surface of the current collector plate 41 can be distinguished at a glance. Therefore, it is easy to control the quality of the current collector plate 41, and it is possible to improve the assembly workability.

(Modified example of second embodiment)
Further, in the second embodiment, the bulging portion 62 that bulges upward as a positioning portion is formed on the current collector plate 41, but the present invention is not limited to this case. For example, the positioning portion may be formed to protrude downward from the current collector plate 41.
For example, as shown in FIG. 10, a protrusion shaft (positioning portion according to the present invention) 63 that projects downward may be formed coaxially with the battery shaft O at the center portion of the current collector plate 41. The protrusion shaft 63 is formed into a circular shape in a plan view with a diameter equal to or slightly larger than the inner diameter of the support 4, and is tightly fitted (for example, interference fit) inside the upper end opening of the support 4 by press-fitting or the like. There is.
Even in the case of this configuration, it is possible to position the support portion 4 with respect to the current collection plate 41 while physically fixing the current collection plate 41 and the support portion 4.

Furthermore, as shown in FIG. 11, a protruding tube (positioning portion according to the present invention) 64 that protrudes downward may be formed coaxially with the battery axis O at the center portion of the current collector plate 41. The protruding tube 64 is formed into a cylindrical shape with an inner diameter equal to or slightly smaller than the outer diameter of the support column 4, and is tightly fitted (for example, interference fit) to the outside of the upper end of the support column 4 by press-fitting or the like. Note that FIG. 11 illustrates a case where the support portion 4 is formed into a columnar shape. However, the same applies even if the support portion 4 is formed into a cylindrical shape.
Even in the case of this configuration, it is possible to position the support portion 4 with respect to the current collection plate 41 while physically fixing the current collection plate 41 and the support portion 4.

(Third embodiment)
Next, a third embodiment of the electrochemical cell according to the present invention will be described with reference to the drawings. In addition, in this 3rd embodiment, the same code|symbol is attached|subjected about the same component as a 1st embodiment, and the description is abbreviate|omitted.

As shown in FIG. 12, in the secondary battery (electrochemical cell according to the present invention) 70 of this embodiment, the support portion 4 is a conductor. Specifically, the support portion 4 is made of metal and has a cylindrical shape. The material of the support column 4 is not particularly limited, but nickel or the like can be suitably used, for example, similarly to the current collector plate 41.

The electrode body 30 is electrically connected to the current collector plate 41 through the pillar part 4 because the pillar part 4 is a conductor. Specifically, the electrode body 30 is wound around the support 4 with the negative electrode 33 being electrically connected to the support 4. Thereby, the negative electrode 33 is electrically connected to the current collector plate 41 through the support portion 4 .

Furthermore, in relation to the fact that the support column 4 is a conductor, there is an insulation between the lower end of the support column 4 and the bottom wall 11 of the container body 10 to insulate the support support 4 and the bottom wall 11. A body 71 is formed.
In the illustrated example, the insulator 71 is formed over the entire upper surface (inner surface) of the bottom wall portion 11 of the container body 10. This makes it possible to electrically insulate between the lower end of the support column 4 and the bottom wall 11 using the insulator 71.

Note that the insulator 71 does not need to be formed over the entire top surface of the bottom wall portion 11. For example, the insulator 71 may be formed at least in a region of the upper surface of the bottom wall portion 11 that is in contact with the lower end portion of the support column portion 4 . Furthermore, the insulator 71 may be continuously formed not only on the upper surface of the bottom wall portion 11 but also on the inner surface side of the peripheral wall portion 12.
Furthermore, the insulator 71 does not need to be formed on the bottom wall portion 11 side, and may be formed on the lower end surface of the column portion 4. Furthermore, the insulator 71 may be formed on the upper surface of the bottom wall portion 11 and the lower end surface of the support portion 4, respectively.

Although the insulator 71 is not limited to a specific one, for example, an insulating synthetic resin film may be used. Furthermore, an insulating tape made of synthetic resin with excellent insulation properties (for example, a tape made of polyimide, a tape made of polyphenylene sulfide (PPS), a tape made of polyethylene terephthalate (PET)) may be employed as the insulator 71. Furthermore, an insulating film using insulating paint may be used as the insulator 71.

Concerning the conduction between the pillar part 4 and the negative electrode 33, it is not limited to a specific method. For example, as shown in FIG. 13, before winding the electrode body 30 around the support 4, the negative terminal tab 33c of the negative electrode 33 is first joined to the outer peripheral surface of the support 4 via a joint 72 by welding or the like. Just do it. Thereafter, as described above, with the separator 31 bonded to the outer peripheral surface of the support column 4 to suppress positional displacement, the separator 31, negative electrode 33, and positive electrode 32 are wound around the support column 4. What is necessary is to form a wound electrode body 30.

Regarding the positive electrode 32, similarly to the first embodiment, the positive terminal tab 32c can be directly electrically connected to the container body 10, or the positive terminal tab 32c can be connected to the positive terminal via a conductor (corresponding to a lead wire) not shown. The tab 32c and the container body 10 may be electrically connected.

(Effect of secondary battery)
Even the secondary battery 70 of this embodiment configured as described above can achieve the same effects as the first embodiment.
In addition, since the negative electrode 33 can be electrically connected to the current collector plate 41 through the support column 4, a conductor (equivalent to a lead wire) or the like is not required, and electrical resistance can be easily reduced. Therefore, it is easy to improve battery performance. Furthermore, regarding the negative electrode 33, electrical connection can be made by bringing the support column 4 and the current collector plate 41 into contact, so that the assembly work can be performed more efficiently.

In addition, when manufacturing the secondary battery 70 of this embodiment, it is basically possible to manufacture it by the 1st manufacturing method and the 2nd manufacturing method in 1st Embodiment.
However, in these manufacturing methods, it is necessary to form the insulator 71 on the bottom wall portion 11 of the container body 10 in advance, for example. Furthermore, since the strut portion 4 is made of metal, it is preferable that the strut portion 4 and the current collector plate 41 be welded to each other by various welding methods.

(Modification of third embodiment)
In the third embodiment, for example, as shown in FIG. 14, the inner peripheral edge of the sealant film 40 may be folded back downward. Thereby, the inner circumferential edge of the sealant film 40 can be used to form the protective portion 40a that covers the entire circumference of the inner circumferential surface of the through hole 23 of the lid member 20 from the inside in the radial direction. Therefore, it is possible to prevent unintentional conduction (short circuit) between the support column 4, which is a conductor, and the lid member 20, which is preferable.

(Modification of third embodiment)
Further, in the third embodiment, the support column 4 itself is made of a metal material to function as a conductor, but the present invention is not limited to this case. For example, the support portion 4 may be formed of a synthetic resin having electrical conductivity (conductive resin).
As this type of synthetic resin, it is preferable to use engineering plastics from the viewpoint of mechanical strength and heat resistance. For example, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polyetheretherketone (PEEK), perfluoroalkoxyfluororesin (PFA), etc. can be used.

Furthermore, the support pillars 4 may be formed by forming the material of the support pillars 4 from an insulating synthetic resin and then forming a metal film on the outer surface of the material. Even in this case, the metal film can be used to achieve electrical connection, so the support column 4 can function as a conductor. In addition, when forming a metal film, plating processing can be performed by performing metal spraying processing, etc., for example.

(Modification of third embodiment)
Further, in the third embodiment, the negative electrode 33 of the electrode body 30 is electrically connected to the current collector plate 41 through the support 4, but as shown in FIG. The secondary battery (electrochemical cell according to the present invention) 80 may be made conductive.

In this case, an insulator 81 is formed between the upper end of the column 4 and the current collector plate 41 to insulate the column 4 and the current collector plate 41 from each other. The insulator 81 may be formed in a region of the lower surface of the current collector plate 41 that is in contact with the upper end of the support column 4 . This makes it possible to electrically insulate between the support column 4 and the current collector plate 41 using the insulator 81.
Note that the insulator 81 may be formed on the upper end surface of the support column 4, or may be formed on the lower surface of the current collector plate 41 and the upper end surface of the support column 4, respectively.

Regarding the positive electrode 32, the positive terminal tab 32c can be directly electrically connected to the current collector plate 41, or the positive terminal tab 32c and the current collector plate 41 can be connected via a conductor (corresponding to a lead wire) not shown. All you have to do is electrically connect them.

In the case of the secondary battery 80 configured as described above, the current collector plate 41 can function as an external connection terminal for the positive electrode. Thereby, the container body 10 can function as an external connection terminal for the negative electrode. Therefore, the secondary battery 80 can be used using the container body 10 and the current collector plate 41.

Note that when winding the electrode body 30 around the support 4, it is not necessary to conduct the negative electrode 33 to the support 4, and the positive electrode 32 may be connected. In this case, the positive electrode 32 and the container body 10 can be electrically connected through the support portion 4 . Regarding the negative electrode 33, the negative terminal tab 33c can be directly electrically connected to the current collector plate 41, or the negative terminal tab 33c and the current collector plate 41 can be connected via a conductor (corresponding to a lead wire) not shown. Just make an electrical connection.
This allows the current collector plate 41 to function as an external connection terminal for the negative electrode. Therefore, the container body 10 can function as an external connection terminal for the positive electrode.

(Fourth embodiment)
Next, a fourth embodiment of the electrochemical cell according to the present invention will be described with reference to the drawings. In addition, in this 4th embodiment, the same code|symbol is attached|subjected about the same component as the component in 1st Embodiment, and the description is abbreviate|omitted.

As shown in FIGS. 16 and 17, the secondary battery (electrochemical cell according to the present invention) 90 of the present embodiment has a lid member (first member according to the present invention) 91 that is connected to the top wall portion 21 and the top wall portion 21. It includes an inner peripheral wall portion 22 extending upward from the outer peripheral edge of the wall portion 21, and an annular flange portion 92 extending radially outward from the upper end of the inner peripheral wall portion 22.
The inner peripheral wall portion 22 slightly protrudes upward from the peripheral wall portion 12 of the container body 10 . The flange portion 92 extends radially outward from the upper end of the inner peripheral wall portion 22 and is welded to the upper open end of the peripheral wall portion 12 so as to overlap from above over the entire circumference.

(Effect of secondary battery)
According to the secondary battery 90 of this embodiment configured in this way, the same effects as those of the first embodiment can be achieved.
In addition, during assembly work, after the lid member 91 is superimposed on the upper opening edge of the peripheral wall portion 12 of the container body 10 from above, welding can be performed, for example, while pressurizing the lid member 91 from above. Therefore, it is easy to firmly weld the container body 10 and the lid member 91 together. Thereby, it is possible to seal the housing space 5 with even higher airtightness.

(Modified example of the fourth embodiment)
In the fourth embodiment, the current collector plate 41 is arranged on the upper surface of the top wall portion 21 of the lid member 91, but the present invention is not limited to this case. For example, it may be arranged on the lower surface of the top wall portion 21 of the lid member 91.
For example, in a secondary battery 90 shown in FIG. 18, a current collector plate 41 is welded to the lower surface of the top wall portion 21 of a lid member 91 via a sealant film 40. Thereby, the current collector plate 41 is integrally combined with the lid member 91 so as to close the through hole 23 formed in the top wall portion 21 from below. Therefore, the current collector plate 41 is partially exposed upward through the through hole 23.

Even with the secondary battery 90 in this case, the same effects as in the fourth embodiment can be achieved. In addition, in this case, since the current collector plate 41 can be arranged on the lower surface of the lid member 91, the entire current collector plate 41 and the lid member 91 are supported from below using the support portion 4. be able to. Therefore, unintended deflection of the lid member 91 can be effectively suppressed.
Note that even in the secondary battery 90 in this case, since the current collector plate 41 can be partially exposed through the through hole 23, it can function as an external connection terminal for the negative electrode. Therefore, by bringing the terminal portion of the external terminal (not shown) into contact with the current collecting plate 41 without contacting the lid member 91, the external terminal and the current collecting plate 41 can be electrically connected. As a result, the secondary battery 90 can be used.

Note that, as shown in FIG. 18, the configuration in which the current collector plate 41 is disposed on the lower surface of the lid member 91 may be applied to the first to third embodiments described above, and will be described below. It may be applied to other embodiments.

(Modified example of the fourth embodiment)
Further, in the fourth embodiment, the lid member 91 includes a flat top wall portion 21, an inner peripheral wall portion 22 extending upward from the outer peripheral edge of the top wall portion 21, and a radial direction from the upper end of the inner peripheral wall portion 22. Although the annular flange portion 92 is provided with an annular flange portion 92 extending toward the outside, the present invention is not limited to this case. For example, as shown in FIG. 19, the lid member 91 may be configured to include an annular groove portion 95 having a U-shaped cross section in place of the inner peripheral wall portion 22.

The annular groove portion 95 is formed over the entire circumference of the outer peripheral edge of the top wall portion 21 . Further, the annular groove portion 95 is formed to have a U-shaped cross section so as to protrude downward. The flange portion 22 is continuous with the annular groove portion 95 over the entire circumference so as to surround the annular groove portion 95 from the outside in the radial direction.
In particular, the lid member 91 in this case is formed so that the top wall portion 21 is at the same height as the flange portion 22. As a result, the top wall portion 21 is disposed higher than in the case shown in FIG. 16 and is disposed flat at the height of the secondary battery 90.

Even in the case of the secondary battery 90 configured in this way, it is easy to firmly weld the container body 10 and the lid member 91 together as in the fourth embodiment.
In addition, according to the secondary battery 90 in this case, since the position of the top wall portion 21 is shifted upward, the internal space can be increased accordingly. Therefore, for example, it is possible to increase the volume of the electrode body 30. Alternatively, it is possible to stabilize the position of the electrode body 30 by arranging a buffer member or the like.

Furthermore, in the secondary battery 90 shown in FIG. 19, the current collector plate 41 is welded to the lower surface of the top wall portion 21 of the lid member 91 via the sealant film 40, as in the case shown in FIG.
In addition, as in a modification of the third embodiment shown in FIG. 14, the inner peripheral edge 40a of the sealant film 40 is folded upward over the entire circumference. In particular, the inner circumferential edge 40a of the sealant film 40 is folded back so as to protrude above the top wall 21.
Thereby, the inner circumferential edge 40a of the sealant film 40 can be used to cover and protect the inner circumferential surface of the through hole 23 of the lid member 91 from the inside in the radial direction. Further, the inner circumferential edge portion 40a protrudes above the height position of the lid member 91. Therefore, when electrically connecting the external terminal and the current collector plate 41, the inner peripheral edge 40a is effectively used to prevent the external terminal and the lid member 91 from unintentionally coming into contact and causing a short circuit. can be prevented.

In addition, in FIG. 19, the current collector plate 41 may be welded to the upper surface of the top wall portion 21 of the lid member 91 via the sealant film 40. In this case, as in a modified example of the third embodiment shown in FIG. It is preferable to protect the

(Fifth embodiment)
Next, a fifth embodiment of the electrochemical cell according to the present invention will be described with reference to the drawings. In addition, in this 5th Embodiment, the same code|symbol is attached|subjected about the same component as the component in 1st Embodiment, and the description is abbreviate|omitted.

As shown in FIGS. 20 to 22, the secondary battery (electrochemical cell according to the present invention) 100 of this embodiment does not have a constant outer diameter along the battery axis O, but has a lower outer diameter than a lower outer diameter. The outside diameter of the side is made larger in diameter.

The container body (second member according to the present invention) 105 includes a first circumferential wall portion (first side portion according to the present invention) 101 extending upward from the outer peripheral edge of the bottom wall portion 11, and a first circumferential wall portion. After being bent radially outward from the upper end of 101, a second peripheral wall part (second side part according to the present invention) 102 extends upward with a diameter expanded from that of the first peripheral wall part 101. It is equipped with.
In this way, the peripheral wall portion 12 of this embodiment includes the first peripheral wall portion 101 and the second peripheral wall portion 102, and is formed into a two-step cylindrical shape with different outer diameters.

The second peripheral wall part 102 is connected to the upper end of the first peripheral wall part 101 via a bent part 103 that is bent radially outward by about 90 degrees. The second peripheral wall portion 102 extends while curving upward from the bent portion 103 toward the outside in the radial direction. Therefore, the upper opening edge of the second peripheral wall portion 102 faces upward.

The lid member 20 is welded to the inner side of the second circumferential wall 102 of the container body 105, with the inner circumferential wall 22 doubly overlapping in the radial direction. Therefore, the lid member 20 is assembled with the top wall portion 21 overlapping the bent portion 103 from above. Further, the inner circumferential wall 22 extends upward in a curved manner from the outer circumferential edge of the top wall 21 toward the outside in the radial direction, corresponding to the shape of the second circumferential wall 102 . Thereby, the inner peripheral wall portion 22 and the second peripheral wall portion 102 are in contact with each other without any gap over the entire circumference.
Furthermore, the upper end opening edge of the inner peripheral wall portion 22 is flush with the upper end opening edge of the second peripheral wall portion 102 and faces upward, which is the same direction.

In the exterior body 2 configured as described above, the second peripheral wall portion 102 and the inner peripheral wall portion 22 are firmly joined by welding over the entire circumference. Thereby, the opening of the container body 105 can be closed using the lid member 20, and the accommodation space 5 that accommodates the support column 4 and the power generation element 3 is hermetically sealed.

(Effect of secondary battery)
According to the secondary battery 100 of this embodiment configured in this way, the same effects as in the first embodiment can be achieved.
In addition, the container body 105 is formed such that the second peripheral wall portion 102 located above the first peripheral wall portion 101 has a larger diameter. Therefore, as shown in FIG. 22, it is possible to secure an annular space 106 around the first peripheral wall 101 by utilizing the difference between the diameter of the first peripheral wall 101 and the diameter of the second peripheral wall 102. can. Thereby, the space 106 can be effectively utilized to arrange, for example, an external terminal (not shown). Therefore, the external terminal can be brought into contact with the first peripheral wall portion 101 from the side to establish electrical continuity. Therefore, the secondary battery 100 can be easily mounted and has excellent mounting performance.

Further, the first circumferential wall portion 101 and the second circumferential wall portion 102 of the container body 105 are connected via a bent portion 103. Thereby, the rigidity of the entire peripheral wall portion 12 can be increased. Therefore, even if the container body 105 is formed with a thin wall, the strength of the container body 105 can be improved.

Furthermore, when the container body 105 and the lid member 20 are combined so that the inner peripheral wall part 22 overlaps in the radial direction inside the second peripheral wall part 102, the lid member 20 is supported using the bent part 103. can do. Therefore, in combination with the support by the support column 4, the lid member 20 can be supported more stably.
Further, while the second peripheral wall part 102 and the inner peripheral wall part 22 are arranged so as to overlap in the radial direction over the entire circumference, the upper end opening edge of the second peripheral wall part 102 and the upper end opening edge of the inner peripheral wall part 22 are arranged. can be arranged so that they both face upward, which is the same direction. Therefore, welding can be performed, for example, while approaching from above. Thereby, the second peripheral wall portion 102 and the inner peripheral wall portion 22 can be firmly and easily welded together. Therefore, the inside of the accommodation space 5 can be sealed with high airtightness.
In addition, since the second peripheral wall portion 102 can be formed with a large diameter, heat dissipation during welding can be improved.

(Sixth embodiment)
Next, a sixth embodiment of the electrochemical cell according to the present invention will be described with reference to the drawings. In addition, in this 6th embodiment, the same code|symbol is attached|subjected about the same component as the component in 1st Embodiment, and the description is abbreviate|omitted.

As shown in FIG. 23, in the secondary battery (electrochemical cell according to the present invention) 110 of the present embodiment, a lid member (first member according to the present invention) 111 is connected to the peripheral wall portion 12 of the container body 10. It has a top wall portion (first bottom portion according to the present invention) 111a formed in the shape of a flat plate that overlaps from above. As a result, the lid member 111 is welded and joined to the upper open end of the peripheral wall portion 12 so as to overlap from above over the entire circumference.
In the illustrated example, a step 111b is provided on the outer peripheral edge of the lid member 111 at a position overlapping the upper open end of the peripheral wall 12. Thereby, the accommodation space 5 is sealed with high airtightness using the step 111b.

(Effect of secondary battery)
According to the secondary battery 110 of this embodiment configured in this way, the same effects as in the first embodiment can be achieved.
In addition, during assembly work, after the lid member 111 is superimposed on the upper opening edge of the peripheral wall portion 12 of the container body 10 from above, welding can be performed, for example, while pressurizing the lid member 111 from above. Therefore, the container body 10 and the lid member 111 can be firmly and easily welded together. Thereby, it is possible to seal the housing space 5 with even higher airtightness. Furthermore, since the lid member 111 can be formed into a flat plate shape, processing of the lid member 111 is easy and costs can be reduced.

(Seventh embodiment)
Next, a seventh embodiment of the electrochemical cell according to the present invention will be described with reference to the drawings. In addition, in this 7th embodiment, the same code|symbol is attached|subjected about the same component as the component in 1st Embodiment, and the description is abbreviate|omitted.

In the first embodiment (the same applies to the second to sixth embodiments), the configuration in which the current collector plate 41 is welded to the lid member 2 via the sealant film 40 has been described as an example. Furthermore, in the first embodiment (the second to sixth embodiments are also the same), the upper end of the support 4 is brought into contact with the current collector plate 41, and the lower end of the support 4 is brought into contact with the bottom wall of the container body 10. The explanation has been given by taking as an example a configuration in which the support column 4 is arranged in the housing space 5 in a state in which it is in contact with the support section 11 .
In contrast, in this embodiment, the current collector plate is welded to the bottom wall of the container via a sealing material.

As shown in FIG. 24, the secondary battery (electrochemical cell according to the present invention) 140 of the present embodiment has a structure that extends through the center of the bottom wall 11 of the container body 10 in the vertical direction. A through hole 141 is formed coaxially with the battery axis O. Although the shape of the through hole 141 is not particularly limited, it is formed, for example, in a circular shape in a plan view.

A current collector plate 41 is thermally welded to the bottom wall portion 11 in which the through hole 141 is formed with a sealant film 40 interposed therebetween. Specifically, the current collector plate 41 is thermally welded to the lower surface of the bottom wall portion 11 via the sealant film 40, and is exposed downward over the entire surface.
The sealant film 40 is formed in an annular shape surrounding the through hole 141 formed in the bottom wall part 11, and is arranged so as to overlap the lower surface of the bottom wall part 11 while being arranged coaxially with the battery axis O. In the illustrated example, the inner peripheral edge 40a of the sealant film 40 is folded upward. Thereby, the inner peripheral edge portion 40a protects the inner peripheral surface of the through hole 141 formed in the bottom wall portion 11 over the entire circumference.

The current collector plate 41 is formed into a circular shape in plan view with a diameter smaller than the outer diameter of the sealant film 40, and is arranged so as to overlap the lower surface of the sealant film 40 while being arranged coaxially with the battery axis O. Thereby, the current collector plate 41 closes the through hole 141 from below.

The lid member (first member according to the present invention) 142 of the present embodiment has a top wall portion formed in a flat plate shape that overlaps the peripheral wall portion 12 of the container body 10 from above, as in the sixth embodiment. (First bottom portion according to the present invention) 142a. As a result, the lid member 142 is welded and joined to the upper open end of the peripheral wall portion 12 so as to overlap from above over the entire circumference.
In the illustrated example, a step 142b is provided on the outer peripheral edge of the lid member 142 at a position overlapping the upper open end of the peripheral wall 12. Thereby, the accommodation space 5 is sealed with high airtightness using the step 142b.

The support column 4 is housed together with the power generating element 3 in a housing space 5 in the exterior body 2 . The support column 4 is formed into a shaft shape that extends in the vertical direction along the battery axis O, and is arranged coaxially with the battery axis O. In the illustrated example, the support column 4 is formed into a hollow cylindrical shape, and its outer diameter is smaller than the diameter of the through hole 141 and the inner diameter of the sealant film 40.
Thereby, the lower end (the first end according to the present invention) of the support column 4 directly contacts the current collector plate 41 from above through the through hole 141, and the upper end (the second end according to the present invention) directly contacts the current collector plate 41 from above. The lid member 142 is disposed such that the end portion) is in direct contact with the lid member 142 from below. Therefore, the support column 4 supports the lid member 142 from below while being supported by the current collector plate 41 that is integrally combined with the bottom wall 11 of the container body 10.

(Effect of secondary battery)
Even in the secondary battery 140 of this embodiment configured in this manner, the lid member 142 can be supported from below using the support portion 4. Therefore, even if the entire exterior body 2 including the lid member 142 is formed to have a thin wall, unintended deformation such as bending of the lid member 142 may occur before the container body 10 and the lid member 142 are welded together. Can be suppressed.
Therefore, the welding work can be performed while suppressing the displacement of the lid member 142 with respect to the container body 10. Therefore, work efficiency can be improved, leading to improved productivity. Furthermore, reliable sealing performance can be obtained, and the secondary battery 140 can have high operational reliability and high quality.

Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. The embodiments and their modifications include, for example, those that can be easily imagined by those skilled in the art, those that are substantially the same, and those that are equivalent.

For example, in each of the above embodiments, a secondary battery has been described as an example of an electrochemical cell, but the invention is not limited to this case, and various power storage devices such as electric double layer capacitors and lithium ion capacitors can be used. It may be applied to

When applying an electrochemical cell to an electric double layer capacitor, a positive electrode and a negative electrode may be used as a pair of polarizable electrodes. Examples of the polarizable electrode in this case include those obtained by mixing powdered activated carbon obtained through activation treatment with a conductive additive and a binder, and molding the mixture using a rolling roll or press. Examples of the electrolytic solution include those in which a supporting salt such as a quaternary ammonium salt is dissolved in a non-aqueous solvent.
When applying an electrochemical cell to a lithium ion capacitor, it is possible to use the above-mentioned polarizable electrode for one of the positive electrode and the negative electrode, and use an electrode for lithium ion batteries for the other electrode. can. As the electrolyte, the same electrolyte as used in lithium ion batteries can be used.

Furthermore, in each of the embodiments described above, when winding the electrode body 30 around the support column 4, it is also possible to use the separator 31 by bending it around the welded part 42, as shown in FIG. 25, for example. Furthermore, instead of using one separator 31, for example, two separators 31 may be stacked and attached to the outer peripheral surface of the support column 4 using the welded portion 42. In this case, the positive electrode 32 and the negative electrode 33 can be wrapped around the support 4 using the two separators 31 .

Further, in each of the above embodiments, the case where a cylindrical support section 4 is used has been described as an example, but the shape of the support section 4 is not limited to a cylindrical shape, and may be changed as appropriate. If the support 4 can be used as a winding core when winding the electrode body 30 and can support the lid member from below when set in the accommodation space 5 together with the electrode body 30, the external shape can be changed. You may change it as you like.

For example, as shown in FIG. 26, the columnar support portion 4 may be used. When the support section 4 is formed into a cylindrical shape, the chuck section 50 that holds the support section 4 includes a first chuck section 55 having a protruding pin 55a that can puncture the upper end surface of the support section 4; The second chuck part 56 may be configured to include a second chuck part 56 having a protruding pin 56a that can be pierced into the lower end surface of the second chuck part 56.
Thereby, the first chuck part 55 and the second chuck part 56 can be used to sandwich the column part 4 from both sides in the direction of the central axis C. Furthermore, it is possible to rotate the column part 4 with high precision around the central axis C while suppressing rotational wobbling and the like by using the chuck part 50.

Furthermore, in the case of a hollow support 4, the internal shape of the support 4 may be, for example, a square, a polygon, a star, a cross, a slit, etc. when viewed in plan from the direction of the central axis C. I don't mind if you do. In particular, it is preferable to adopt such an internal shape because it becomes easier to apply rotational torque to the support column 4 using the chuck section 50.

Furthermore, in each of the above embodiments, as shown in FIG. 27, a flat surface 120 extending along the axial direction of the support column 4 may be formed on the outer circumferential surface of the support column 4. Thereby, the separator 31 can be positioned by the welded portion 42 while being in surface contact with the flat surface 120.
In this case, the separator 31 can be positioned more stably with respect to the support column 4. Therefore, when winding the separator 31, the positive electrode 32, and the negative electrode 33 around the support 4, it is possible to effectively suppress winding misalignment such as misalignment of the relative position of the separator 31 with respect to the support 4. I can do it.

Furthermore, in each of the above embodiments, as shown in FIG. 28, a groove 121 extending along the axial direction of the support column 4 may be formed on the outer circumferential surface of the support column 4. Thereby, the holding member 122 can be removably mounted in the groove 121 with the separator 31 sandwiched therebetween.

The groove portion 121 is formed in the shape of a vertically long slit extending over the entire length of the support portion 4, and is open upwardly and downwardly. In the illustrated example, two grooves 121 are formed so as to face each other in the radial direction with the center axis C interposed therebetween. However, only one groove 121 may be formed on the outer circumferential surface of the support column 4, or three or more grooves 121 may be formed at intervals in the circumferential direction.
The pressing member 122 is formed into a vertically long rod shape. The holding member 122 can be fitted inside the groove 121 with the separator 31 sandwiched therebetween, for example, by inserting or pushing the holding member 122 into the groove 121.

Even in this case, the separator 31 can be positioned more stably with respect to the support column 4. Therefore, when winding the separator 31, the positive electrode 32, and the negative electrode 33 around the support 4, it is possible to effectively suppress winding misalignment such as misalignment of the relative position of the separator 31 with respect to the support 4. I can do it.

Furthermore, when the groove 121 is formed on the outer peripheral surface of the support column 4, the holding members 125 and 126 may function as current collecting terminals for the positive electrode 32 and the negative electrode 33, as shown in FIG. . Note that the support portion 4 in this case is formed of an insulating material.
One of the pressing members 125 is made of metal, and can fit inside the groove 121 while sandwiching the negative terminal tab 33c of the negative electrode 33 together with the separator 31, for example.
Note that in FIG. 29, illustration of the separator 31 is omitted. Thereby, one pressing member 125 can be electrically connected to the negative electrode current collector 33a. Therefore, one pressing member 125 can function as a current collector terminal for the negative electrode.
Note that one pressing member 125 is formed so as to protrude upward from the support column 4, and is configured to easily come into contact with the current collector plate 41.

The other pressing member 126 is made of metal and can be fitted inside the groove 121 while sandwiching the positive terminal tab 32c of the positive electrode 32 together with the separator 31, for example. Thereby, the other pressing member 126 can be electrically connected to the positive electrode current collector 32a. Therefore, the other pressing member 126 can function as a current collector terminal for the positive electrode.
Note that the other pressing member 126 is formed so as to protrude further downward than the support portion 4 and is configured to easily come into contact with the bottom wall portion 11 of the container body 10.

When configured in this way, the holding members 125 and 126 can be used as current collector terminals for the positive electrode and the negative electrode, respectively. Therefore, it becomes easier to ensure conduction between the electrode body 30 and the current collector plate 41 and between the electrode body 30 and the container body 10. Therefore, assembly work can be performed more efficiently.

Furthermore, in each of the above embodiments, as shown in FIG. 30, the support 4 may have a first pillar 131 and a second pillar 132 arranged in a bifurcated manner so as to face each other in the radial direction with the central axis C in between. I do not care.
The first column portion 131 and the second column portion 132 are integrally formed with a base portion 133 that is circular in plan view, and are also formed to extend upward from the base portion 133. The first column part 131 and the second column part 132 are formed, for example, in an elongated columnar shape.

When winding the electrode body 30 around the pillar part 4 configured in this way, the separator 31 is inserted between the first pillar part 131 and the second pillar part 132, as shown in FIG. . Then, by rotating the column portion 4 as shown in FIG. 32, only the separator 31 can be wound in advance around the first column portion 131 and the second column portion 132. Thereby, the separator 31 can be positioned with respect to the support column 4.
Therefore, as shown in FIG. 33, after the positive electrode 32 and the negative electrode 33 are superimposed on the separator 31, by further rotating the support 4, the positive electrode 32 and the negative electrode are wrapped around the support 4. 33 and separator 31 can be wound. As a result, it is possible to form the electrode body 30.

In addition, as shown in FIG. 34, the first column part 131 and the second column part 132 may be formed into a plate-shaped column part 4. Furthermore, as shown in FIG. 35, by forming a slit-like cut, the pillar part 4 may be formed into a first pillar part 131 and a second pillar part 132.

Furthermore, as shown in FIG. 36, the support 150 may include a first pillar 151 and a second pillar 152.
The first strut section 151 and the second strut section 152 are arranged on both sides of the central axis C of the strut section 150, with the base end 151a of the first strut section 151 and the base end 152a of the second strut section 152 connected. are arranged to face each other in the radial direction. At this time, the portions of the first support portion 151 and the second support portion 152 excluding the base end portions 151a and 152a are arranged to face each other with the slit portion 153 in between. The slit portion 153 is a space into which at least the separator 31 can be inserted.

In the illustrated example, the first support portion 151 and the second support portion 152 are formed in a semicircular shape when viewed from the center axis C direction. Further, the first support portion 151 and the second support portion 152 have the same length along the central axis C direction. Thereby, the support portion 150 is formed into a substantially cylindrical shape having a slit portion 153.

Further, the base end 151a of the first support 151 and the base 152a of the second support 152 that are coupled to each other constitute a base 154 as the support 150.
The first support portion 151 and the second support portion 152 are deformable so as to close the slit portion 153 by winding the electrode body 30 around the support portion 150. In other words, the first support section 151 and the second support section 152 are pushed by the winding of the electrode body 30 around the support section 150, and are gradually deformed so as to approach each other toward the central axis C with the base section 154 as a starting point. It is considered possible. As a result, the first support portion 151 and the second support portion 152 are finally deformed to close the slit portion 153, and are able to sandwich the member inserted into the slit portion 153.

The strut portion 150 configured in this manner is constructed by, for example, forming the first strut portion 151 and the second strut portion 152, and then welding and joining the base end portion 151a and the base end portion 152a together, for example, by welding or the like. It is possible to manufacture it by doing this. Alternatively, it may be manufactured by bending one metal member by casting or the like. In this case, the bent portion functions as the base 154.
Note that the material of the support column 150 is not particularly limited. For example, when the support portion 150 is made of metal, metal materials such as SUS, aluminum, and copper can be used.

When using the above-mentioned strut section 150, when winding the electrode body 30 around the strut section 150, it is possible to deform the first strut section 151 and the second strut section 152 as indicated by the arrow F shown in FIG. The slit portion 153 can be closed. Note that, in order to make the drawing easier to see, FIG. 37 shows a state before the slit portion 153 is closed. Furthermore, illustration of the separator 31 is omitted.
Thereby, the portions inserted into the slit portions 153 in advance, ie, the separator 31, the positive electrode 32, the negative electrode 33, etc., can be sandwiched between the first support portion 151 and the second support portion 152 before winding. Thereby, when winding the electrode body 30, it is possible to suppress occurrence of winding misalignment, such as misalignment of the relative positional relationship of the separator 31 and the like with respect to the support column 150. Furthermore, stable conduction between the electrode body 30 and the support portion 150 can be ensured, for example.

In addition, when using the above-mentioned pillar part 150, in order to more reliably sandwich the separator 31, positive electrode 32, negative electrode 33, etc. between the first pillar part 151 and the second pillar part 152, for example, a first pillar part 150 is used. A predetermined process may be performed on the slit surface 151b of the first support section 151 and the slit surface 152b of the second support section 152. For example, the slit surface 151 and the slit surface 152b may be subjected to processing to form protrusions, processing to increase the contact area (for example, satin finishing, striation processing, mountain processing), etc.
Furthermore, in order to make it easier to insert the separator 31, positive electrode 32, negative electrode 33, etc. into the slit portion 153, the first support portion 151 and the second support portion 152 are subjected to various treatments such as chamfering, barrel polishing, electrolytic polishing, etc. Surface treatment may be applied.

Furthermore, the first support portion 151 and the second support portion 152 do not need to be formed to have the same length, and may be formed to have different lengths. For example, as shown in FIG. 38, the first support 151 may be longer than the second support 152 in the support 150.
In this way, by making the lengths of the first support section 151 and the second support section 152 different, the long support section (in the case of FIG. 38, the first support section 151) can be used to open the slit. Since the separator 31, positive electrode 32, negative electrode 33, etc. can be guided toward the portion 153, insertion becomes easier.

According to the present invention, it is possible to obtain an electrochemical cell that can provide reliable sealing performance even if the outer casing is made thin, and can also lead to improved productivity.

O... Battery axis 1, 60, 70, 80, 90, 100, 110, 140... Secondary battery (electrochemical cell)
2... Exterior body 4, 150... Support portion 5... Accommodation space 10, 105... Container body (second member)
11...Bottom wall part (second bottom part)
12... Peripheral wall part (side part)
20, 91, 111, 142...lid member (first member)
21, 111a, 142a...Top wall part (first bottom part)
23...Through hole 22...Inner peripheral wall part (inner side part)
30... Electrode body 31... Separator 32... Positive electrode 33... Negative electrode 40... Sealant film (sealing material)
41...Current collector plate 61...Protrusion (positioning part)
62...Bulging part (positioning part)
63...Protrusion shaft (positioning part)
64...Protrusion tube (positioning part)
71, 81...Insulator 101...First peripheral wall part (first side part)
102...Second peripheral wall part (second side part)
120... Flat surface 121... Groove portion 122, 125, 126... Pressing member 131, 151... First column portion 132, 152... Second column portion 153... Slit portion second column portion

Claims (15)

an electrode body;
an exterior body having a side portion, a first bottom portion and a second bottom portion facing each other in the battery axial direction, and housing the electrode body in a housing space formed therein;
a current collector plate that is electrically connected to the electrode body and at least partially exposed to the outside of the exterior body;
The exterior body is
a first member including the first bottom;
a second member including the second bottom portion and welded to the first member;
a strut portion disposed in the housing space along the battery axis direction and supporting the first bottom portion and the second bottom portion;
In the electrode body, a positive electrode and a negative electrode stacked with a separator interposed therebetween are wound around the centerline axis of the support column ,
the current collector plate is welded to the first bottom via an insulating sealant,
The electrochemical cell is characterized in that the support column has a first end in contact with the current collector plate and a second end in contact with the second bottom. The electrochemical cell according to claim 1 ,
In the electrochemical cell, the support column is made of an insulating material. The electrochemical cell according to claim 1 ,
The support section is a conductor,
The first end of the support column and the current collector plate are in direct contact with each other, so that the electrode body and the current collector plate are electrically connected via the support column,
In the electrochemical cell, the second end portion of the support portion and the second bottom portion are insulated by contacting each other via an insulator. The electrochemical cell according to claim 1 ,
The support section is a conductor,
The first end of the support column and the current collector plate are insulated by contacting each other via an insulator,
An electrochemical cell, wherein the second end portion of the support portion and the second bottom portion are in direct contact with each other, so that the electrode body and the second bottom portion are electrically connected via the support portion. . The electrochemical cell according to claim 3 or 4 ,
The current collector plate is welded to an outer surface of the first bottom portion facing opposite to the housing space in the battery axis direction via the sealing material, and is exposed to the outside over the entire surface;
In the electrochemical cell, the support portion is in contact with the current collector plate through a through hole formed to penetrate the first bottom portion in the battery axial direction. The electrochemical cell according to claim 3 or 4 ,
The current collector plate is welded to the inner surface of the first bottom portion facing the housing space via the sealing material, and has a through hole formed to penetrate the first bottom portion in the battery axial direction. An electrochemical cell that is partially exposed to the outside through a pore. The electrochemical cell according to any one of claims 1 to 6 ,
An electrochemical cell, comprising a positioning section that positions the support column in a direction intersecting the battery axis. The electrochemical cell according to any one of claims 1 to 7 ,
The second member is formed into a bottomed cylindrical shape having the side portion and the second bottom portion,
The first member is an electrochemical cell, wherein the first bottom portion is welded to the upper opening edge of the side portion so as to overlap with the upper opening edge of the side portion. The electrochemical cell according to any one of claims 1 to 7 ,
The second member is formed into a bottomed cylindrical shape having the side portion and the second bottom portion,
The first member extends upward from the outer peripheral edge of the first bottom part, and includes an inner side part welded to overlap the inner side of the side part,
An electrochemical cell, wherein a top opening edge of the side portion and a top opening edge of the inner side portion face upward. The electrochemical cell according to claim 9 ,
The side portion of the second member is
a first side portion extending upward from the outer peripheral edge of the second bottom portion;
a second side portion that is bent radially outward from an upper end portion of the first side portion and then extends upward with a diameter expanded from that of the first side portion;
The first member is welded and joined with the inner side portion overlapping the second side portion,
An electrochemical cell, wherein a top opening edge of the second side and a top opening edge of the inner side face upward. The electrochemical cell according to any one of claims 1 to 10 ,
A flat surface extending along the axial direction of the support column is formed on the outer peripheral surface of the support column,
In the electrochemical cell, the separator is positioned with respect to the support column in a state in which it is in surface contact with the flat surface. The electrochemical cell according to any one of claims 1 to 10 ,
A groove extending along the axial direction of the support column is formed on the outer peripheral surface of the support column,
A holding member is removably installed in the groove with the separator sandwiched therein;
In the electrochemical cell, the separator is positioned with respect to the column by fitting the pressing member into the groove. The electrochemical cell according to claim 12 ,
In the electrochemical cell, the pressing member also serves as a current collecting terminal for the positive electrode or the negative electrode. The electrochemical cell according to any one of claims 1 to 10 ,
The pillar part includes a first pillar part and a second pillar part arranged in a bifurcated manner so as to face each other in the radial direction with the central axis of the pillar part in between,
The separator is inserted between the first pillar part and the second pillar part and wound around the pillar part, thereby positioning the electrochemical cell with respect to the pillar part. . The electrochemical cell according to claim 14 ,
The first columnar portion and the second columnar portion are arranged to face each other with a slit portion into which the separator is inserted,
The first pillar part and the second pillar part are configured to be deformable so as to close the slit part by winding the electrode body around the pillar part.

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