Cylindrical battery

Abstract

A cylindrical battery (10) comprises: an electrode body (14) that has a positive electrode (11), a negative electrode (12), and a separator (13), and that is formed by winding the positive electrode (11) and the negative electrode (12) with the separator (13) interposed therebetween; a bottomed cylindrical outer can (15) that houses the electrode body (14); a sealing body (17) that closes the opening of the outer can (15); and an insulating plate (22) that is provided between the electrode body (14) and the sealing body (17), wherein an insulating support (40) that supports the sealing body (17) is provided on the upper surface of the insulating plate (22), said upper surface facing the sealing body (17).

Description

Cylindrical battery

[0001] The present disclosure relates to a cylindrical battery, and particularly to a structure for suppressing deformation of a sealing body of the cylindrical battery.

[0002] A cylindrical battery generally has a structure including an electrode body composed of a positive electrode, a negative electrode, and a separator, an outer can for housing the electrode body, and a sealing body for closing the opening of the outer can (for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2008-91260

[0004] In order to seal the inside of the outer can, the cylindrical battery fixes the sealing body to the outer can via a gasket by caulking the opening side of the outer can inward in the radial direction. In order to obtain sufficient sealing performance in this caulking process, it is necessary to apply a large load to the end of the sealing plate. However, at that time, if the rigidity of the sealing plate is low, deformation of the sealing plate occurs. If the deformation of the sealing body is excessive, it may be difficult to weld the batteries together, or the operating pressure of the current interruption mechanism may fluctuate, affecting the battery performance. In particular, in a cylindrical battery in which a thin sealing body is adopted for high capacity, it is required to suppress the deformation of the sealing body assuming the above problems.

[0005] The cylindrical battery according to the present disclosure includes a positive electrode, a negative electrode, and a separator, an electrode body formed by winding the positive electrode and the negative electrode with the separator interposed therebetween, a bottomed cylindrical outer can for storing the electrode body, a sealing body for closing the opening of the outer can, and an insulating plate disposed between the electrode body and the sealing body, and an insulating support portion for supporting the sealing body is provided on the upper surface of the insulating plate facing the sealing body.

[0006] According to the cylindrical battery according to the present disclosure, it is possible to suppress deformation of the sealing body.

[0007] It is a figure which shows the axial cross-sectional view of the cylindrical battery which concerns on this embodiment. It is an enlarged view of part A of FIG. 1. It is a figure which illustrates the fixing method of a support part. It is a figure which looked at the bottom face of the support part in which a passage part was formed from the lower side in the thickness direction of the upper insulating plate. It is a figure which shows a modification of a support part. It is a figure which shows a modification of a support part. It is a figure which shows a modification of a support part. It is a figure which shows the integrated support part and the upper insulating plate.

[0008] Hereinafter, an example of an embodiment of the cylindrical battery according to this disclosure will be described in detail with reference to the drawings. The cylindrical battery of this disclosure may be a primary battery or a secondary battery. It may also be a battery using an aqueous electrolyte or a battery using a non-aqueous electrolyte. In the following, a non-aqueous electrolyte secondary battery (lithium-ion battery) using a non-aqueous electrolyte will be given as an example of a cylindrical battery 10, which is one embodiment, but the cylindrical battery of this disclosure is not limited to this. Furthermore, configurations obtained by selectively combining the components of the multiple embodiments and modified examples described below are included in the scope of this disclosure.

[0009] Figure 1 is a cross-sectional view of a cylindrical battery 10, which is an example of an embodiment. As shown in Figure 1, the cylindrical battery 10 comprises a wound electrode body 14, a bottomed cylindrical outer casing 15 that houses the electrode body 14, and a sealing body 17 that closes the opening of the outer casing 15. The cylindrical battery 10 contains an electrolyte, which is housed in the outer casing 15 together with the electrode body 14. The cylindrical battery 10 further comprises an upper insulating plate 22 positioned between the electrode body 14 and the sealing body 17. As will be described in detail later, the cylindrical battery 10 has an insulating support portion 40 that supports the sealing body 17 on the surface (upper surface) of the upper insulating plate 22 facing the sealing body 17.

[0010] The electrode body 14 has a positive electrode 11, a negative electrode 12, and a separator 13, and has a wound structure in which the positive electrode 11 and the negative electrode 12 are wound in a spiral shape via the separator 13. The positive electrode 11, the negative electrode 12, and the separator 13 are all elongated strip-shaped bodies, and are alternately stacked in the radial direction of the electrode body 14 by being wound in a spiral shape. The negative electrode 12 is formed to be slightly larger in dimensions than the positive electrode 11 in order to prevent lithium deposition. That is, the negative electrode 12 is formed to be longer in the longitudinal direction and the width direction (short direction) than the positive electrode 11. The separator 13 is formed to be at least slightly larger in dimensions than the positive electrode 11, and two separators are arranged so as to sandwich the positive electrode 11.

[0011] The outer casing 15 is a bottomed cylindrical metal container that houses the electrode body 14 and the electrolyte. A groove 16 is formed on the side of the outer casing 15, extending circumferentially and protruding radially inward. The radial length of the groove 16 on the outer casing 15 is preferably such that it does not come into contact with the positive electrode lead 20 extending from the electrode body 14. For the sake of explanation, the sealing body 17 side of the cylindrical battery 10 will be considered the top, and the bottom side of the outer casing 15 will be considered the bottom. The groove 16 is preferably formed in an annular shape along the circumferential direction of the outer casing 15, and its upper surface supports the sealing body 17. The sealing body 17 and gasket 30 are fixed to the upper part of the outer casing 15 by the groove 16 and the open end of the outer casing 15 which is crimped to the sealing body 17 and gasket 30. The opening of the outer can 15 is circular in plan view, and the sealing body 17 is similarly circular in plan view.

[0012] The electrolyte may be an aqueous electrolyte, but in this embodiment, a non-aqueous electrolyte is used. The non-aqueous electrolyte has lithium-ion conductivity. The non-aqueous electrolyte may be a liquid electrolyte (electrolyte solution) or a solid electrolyte. The cylindrical battery 10 is a non-aqueous electrolyte secondary battery, and among these, a lithium-ion battery is preferred.

[0013] A liquid electrolyte (electrolyte solution) comprises a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. Examples of non-aqueous solvents include esters, ethers, nitriles, amides, and mixtures of two or more of these. Examples of non-aqueous solvents include ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and mixtures thereof. The non-aqueous solvent may also contain halogen-substituted compounds (e.g., fluoroethylene carbonate) in which at least some of the hydrogen atoms in the solvent are replaced with halogen atoms such as fluorine. Examples of electrolyte salts include lithium salts such as LiPF6.

[0014] As the solid electrolyte, for example, a solid or gel-like polymer electrolyte, an inorganic solid electrolyte, etc., can be used. As the inorganic solid electrolyte, materials known for all-solid-state lithium-ion secondary batteries, etc. (for example, oxide-based solid electrolytes, sulfide-based solid electrolytes, halogen-based solid electrolytes, etc.) can be used. The polymer electrolyte includes, for example, a lithium salt and a matrix polymer, or a non-aqueous solvent, a lithium salt and a matrix polymer. As the matrix polymer, for example, a polymer material that absorbs a non-aqueous solvent and gels is used. Examples of polymer materials include fluororesins, acrylic resins, polyethers, etc.

[0015] The positive electrode 11 comprises a long positive electrode core and a positive electrode mixture layer provided on the positive electrode core. The positive electrode core can be made of a metal foil that is stable within the potential range of the positive electrode 11, such as aluminum, aluminum alloy, stainless steel, or titanium, or a film with the metal arranged on its surface. The positive electrode mixture layer contains a positive electrode active material, a conductive agent such as acetylene black, and a binder such as polyvinylidene fluoride (PVdF), and is preferably formed on both sides of the positive electrode core except for the portion to which the positive electrode lead 20 described later is connected. For example, a lithium transition metal composite oxide containing Ni, Co, Mn, Al, etc., can be used as the positive electrode active material.

[0016] The negative electrode 12 comprises a long negative electrode core and a negative electrode mixture layer provided on the negative electrode core. The negative electrode core can be made of a metal foil that is stable within the potential range of the negative electrode 12, such as copper, copper alloy, stainless steel, nickel, or nickel alloy, or a film with the metal arranged on its surface. The negative electrode mixture layer contains a negative electrode active material and a binder such as styrene-butadiene rubber (SBR), and is preferably formed on both sides of the negative electrode core except for the portion to which the negative electrode lead 21 described later is connected. For example, graphite or a Si-containing material can be used as the negative electrode active material.

[0017] The separator 13 is made of a porous sheet having ion permeability and insulating properties. Specific examples of porous sheets include microporous thin films, woven fabrics, and nonwoven fabrics. Suitable materials for the separator 13 (porous sheet) include polyethylene, polyolefins such as polypropylene, and cellulose. The separator 13 may have a single-layer structure or a multi-layer structure. In addition, a highly heat-resistant resin layer, such as aramid resin, may be formed on the surface of the separator 13.

[0018] The electrode body 14 further includes a positive electrode lead 20 connected to the core of the positive electrode 11 by welding or the like, and a negative electrode lead 21 connected to the core of the negative electrode 12 by welding or the like. An upper insulating plate 22 and a lower insulating plate 23 are positioned above and below the electrode body 14, respectively. The upper insulating plate 22 is provided between the electrode body 14 and the sealing body 17, and the lower insulating plate 23 is provided between the electrode body 14 and the bottom of the outer container 15. In the example shown in Figure 1, the positive electrode lead 20 extends towards the sealing body 17 through a through hole in the upper insulating plate 22, and the negative electrode lead 21 extends towards the bottom of the outer container 15 through the outside of the lower insulating plate 23. In this embodiment, the positive electrode lead 20 is connected to the lower surface of the sealing body 17 by welding or the like, so that the sealing body 17 becomes the positive electrode external terminal, and the negative electrode lead 21 is connected to the inner surface of the bottom of the outer container 15 by welding or the like, so that the outer container 15 becomes the negative electrode external terminal.

[0019] The outer container 15 is a bottomed cylindrical metal container with one end open in the axial direction, and the opening of the outer container 15 is sealed by a sealing body 17 via a gasket 30. The constituent material of the outer container 15 is not particularly limited, but stainless steel is one example of a preferred constituent material.

[0020] Referring further to Figure 2, a sealing body 17 of a cylindrical battery 10, which is an example of an embodiment, will be described in detail. Figure 2 is an enlarged view of part A in Figure 1. In this embodiment, an example in which the sealing body 17 is composed of one part will be given for explanation, but the configuration of the sealing body 17 is not limited to this. That is, the sealing body 17 may be composed of multiple parts.

[0021] The sealing body 17 has a circular shape in plan view. The sealing body 17 can be manufactured, for example, by press-forming a sheet of aluminum or an aluminum alloy. Aluminum and aluminum alloys are preferred materials for the sealing body 17, which functions as an explosion-proof valve, because they have excellent flexibility. The sealing body 17 has a central portion 17a, a flange portion 17b extending radially outward from the central portion 17a to the outer can 15, and an inclined portion 17c connecting the central portion 17a and the flange portion 17b.

[0022] The thickness of the inclined portion 17c is thinner than that of the central portion 17a and the flange portion 17b. The lower surface of the inclined portion 17c is located above the lower surface of the central portion 17a and is connected to the lower surface of the central portion 17a via the annular groove 17d. The annular upper surface of the inclined portion 17c is an inclined surface that is located higher as it moves radially outward, and the annular lower surface of the inclined portion 17c is also an inclined surface that is located higher as it moves radially outward. The thickness of the inclined portion 17c decreases as it moves radially outward.

[0023] According to the configuration of the sealing body 17 described above, when the internal pressure of the cylindrical battery 10 reaches a predetermined value, gas can be released. Specifically, when the internal pressure of the cylindrical battery 10 reaches a predetermined value, the central part 17a and the inclined part 17c of the sealing body 17 invert upward in the height direction, using the radially outward annular end 17e, which has low rigidity in the inclined part 17c, as a fulcrum. Furthermore, as the internal pressure rises, the annular end 17e of the inclined part 17c ruptures, and the gas inside the battery is discharged to the outside from the rupture in the sealing body 17. This prevents the battery from rupturing even when the internal pressure of the cylindrical battery 10 rises.

[0024] Although not shown in Figure 2, the sealing body 17 may also have a structure in which multiple components such as an internal terminal plate, an annular insulating plate, and a sealing plate are stacked in order from the electrode body 14 side. Each component constituting the sealing body 17 has a disc shape or a ring shape, and each component except the annular insulating plate is electrically connected. In this case, the positive electrode lead 20 is connected to the lower surface of the internal terminal plate, which is the lower surface of the sealing body 17.

[0025] As shown in Figures 1 and 2, the gasket 30 is a sealing member positioned on the opening side of the outer can 15, between the sealing body 17 and the outer can 15. The annular gasket 30 seals the space between the outer can 15 and the sealing body 17, thereby sealing the internal space of the outer can 15. The gasket 30 also insulates the sealing body 17 from the outer can 15. In other words, the gasket 30 serves as a sealing material to maintain airtightness inside the battery and as an insulating material to prevent short circuits between the outer can 15 and the sealing body 17.

[0026] The gasket 30 is fixed to the upper end of the outer can 15 by the grooved portion 16 of the outer can 15 and the crimped portion 18 of the opening edge of the outer can 15 which is crimped to the sealing body 17 and the gasket 30. After crimping and fixing, the gasket 30 is positioned between the sealing body 17 and the crimped portion 18, and between the sealing body 17 and the grooved portion 16.

[0027] The upper insulating plate 22 and support portion 40 according to this embodiment will be described in detail with further reference to Figures 2 to 4. Figure 3 is a diagram illustrating a method for fixing the support portion 40. Figure 4 is a view of the bottom surface of the support portion 40b, on which the through portion 41 is formed, as seen from below in the thickness direction of the upper insulating plate 22.

[0028] As shown in Figure 2, the cylindrical battery 10 has an insulating support portion 40 on the surface (upper surface) of the upper insulating plate 22 facing the sealing body 17 to support the sealing body 17. The support portion 40 is made of an insulating material, and may be made of the same material as the upper insulating plate 22, for example. The support portion 40 may directly support the sealing body 17. That is, the support portion 40 may support the sealing body 17 by directly contacting its lower surface. On the other hand, the support portion 40 may support the sealing body 17 via other components. For example, the support portion 40 supports the sealing body 17 via the positive electrode lead 20.

[0029] As described above, the support portion 40 is provided on the surface (upper surface) of the upper insulating plate 22 facing the sealing body 17. The method of fixing the support portion 40 to the upper surface of the upper insulating plate 22 is not particularly limited, but for example, it may be bonded with an adhesive. Alternatively, a projection may be formed on the upper surface of the upper insulating plate 22, and the position of the support portion 40 may be maintained by inserting the projection into a hole formed in the support portion 40. Note that fixing by the projection and hole allows for vertical movement, but vertical movement is suppressed and the sealing body 17 is fixed by crimping. Furthermore, as shown in Figure 3, the support portion 40a may have an extension portion in its lower region that extends radially outward from the outer can 15, and this extension portion may be configured to be clamped and fixed to the grooved portion 16 and the upper insulating plate 22 by crimping.

[0030] As described above, the support portion 40 supports the lower surface of the sealing body 17. The support portion 40 may also support the flange portion 17b of the sealing body 17. In this case, a support portion 40a as shown in Figure 2 is formed. The support portion 40a is a support member that supports the flange portion 17b of the sealing body 17. The shape of the support portion 40a when viewed from the thickness direction of the upper insulating plate 22 is not particularly limited, but for example it may be an annular shape, or each support portion 40a may be an arc and a plurality of arcs may be arranged in an annular shape. It is preferable that the support portion 40a has an annular shape that maximizes the support area from the viewpoint of suppressing deformation of the sealing body 17.

[0031] As described above, the support portion 40a supports the flange portion 17b that extends radially outward from the central portion 17a of the sealing body 17 toward the outer can 15. A slanted portion 17c may be formed between the central portion 17a and the flange portion 17b. In that case, it is preferable for the support portion 40a to support only the flange portion 17b and not the slanted portion 17c. This is because the slanted portion 17c is thinner than the other areas, and supporting the slanted portion 17c may cause it to deform during crimping.

[0032] The support portion 40 may support the central portion 17a of the sealing body 17. In this case, a support portion 40b as shown in Figure 2 is formed. The support portion 40b supports the central portion 17a of the sealing body 17. The shape of the support portion 40a when viewed from the thickness direction of the upper insulating plate 22 is not particularly limited, but for example, it is circular. Furthermore, it is preferable that the support portion 40b has a larger area than the central portion 17a of the sealing body 17 when viewed from the thickness direction of the upper insulating plate 22. This allows for more reliable support of the central portion 17a and effectively suppresses deformation of the sealing body 17.

[0033] The support portion 40b may have a passage portion 41 configured to allow the positive electrode lead 20 to pass through. As shown in Figure 2, the support portion 40b may have a passage portion 41 formed by cutting out the surface (bottom surface) facing the upper insulating plate 22. As shown in Figure 4, it is preferable that the passage portion 41 is formed in a linear shape along the radial direction of the support portion 40 and passes through the center of the support portion 40. If the support portion 40b does not have a passage portion 41, the positive electrode lead 20 will be folded back between the sealing body 17 and the support portion 40b, and a large force will be applied when it is sandwiched between the sealing body 17 and the support portion 40b during crimping. This may damage the positive electrode lead 20 and worsen the battery performance. Therefore, by having a passage portion 41 in the support portion 40b, the folding position of the positive electrode lead 20 is adjusted, and damage to the positive electrode lead 20 is suppressed, thereby suppressing deterioration of battery performance.

[0034] The height of the passage portion 41 is preferably set based on the thickness of the positive lead 20. The height of the passage portion 41 is preferably, for example, 100% or more of the thickness of the positive lead 20. More preferably, the height of the passage portion 41 is, for example, 120% or more of the thickness of the positive lead 20. Similarly, the width of the passage portion 41 is preferably set based on the width of the positive lead 20. The width of the passage portion 41 is, for example, more than 100% of the width of the positive lead 20, and more preferably more than 110% and 150% or less.

[0035] The positive electrode lead 20 extending from the electrode body 14 passes through the passage portion 41 once and is connected to the lower surface of the sealing body 17. That is, the support portion 40b illustrated in Figure 2 does not directly contact the sealing body 17, but supports the sealing body 17 via the positive electrode lead 20.

[0036] When a through portion 41 is formed in the support portion 40b, and the bottom surface of the support portion 40b is viewed from below in the thickness direction of the upper insulating plate 22, it is preferable that the area of ​​the through portion 41 is smaller than the area in which the support portion 40b contacts the upper insulating plate 22 (see Figure 4). In other words, it is preferable that the area in which the support portion 40b contacts the upper insulating plate 22 is larger than the area of ​​the through portion 41. In the example shown in Figure 4, the area indicated by the dots indicates the bottom surface of the support portion 40b, and the white area indicates the area of ​​the through portion 41. That is, the area indicated by the dots is the area in contact between the support portion 40b and the upper insulating plate 22. With the above configuration, an area in which the support portion 40b contacts the upper insulating plate 22 is secured, so that deformation of the support portion 40b due to the force during crimping can be prevented. That is, the stability of the support portion 40b can be ensured, the sealing body 17 can be supported more reliably, and deformation of the sealing body 17 can be effectively suppressed.

[0037] Preferably, the support portion 40 supports both the central portion 17a and the flange portion 17b of the sealing body 17, as shown in Figure 2. That is, it is preferable that the support portion 40 comprises both a support portion 40a and a support portion 40b, which are separate support portions 40. By providing both a support portion 40a and a support portion 40b, a wider area of ​​the sealing body 17 can be supported, thereby effectively suppressing deformation of the sealing body 17.

[0038] A modified example of the support portion 40 will be described with reference to Figures 5A, 5B, and 5C. In detail, a modified example of the passage portion 41 of the support portion 40b will be described. Figures 5A, 5B, and 5C are diagrams showing modified examples of the support portion 40.

[0039] As shown in Figure 5A, the support portion 40b may have a through portion 42 cut out from the surface (top surface) facing the sealing body 17. By providing the through portion 42 on the top surface of the support portion 40b, the support portion 40b can be brought into direct contact with the bottom surface of the sealing body 17. That is, by providing the through portion 42, the support portion 40b can directly support the sealing body 17. As a result, the support area is larger compared to the case where the sealing body 17 is supported via the positive electrode lead 20, and deformation of the sealing body 17 can be suppressed more effectively.

[0040] The height of the passage portion 42 is preferably set based on the thickness of the positive lead 20. In the example shown in Figure 5A, the positive lead 20 is folded within the passage portion 42, so the height of the passage portion 42 is preferably at least twice the thickness of the positive lead 20. Similarly, the width of the passage portion 42 is preferably set based on the width of the positive lead 20. The width of the passage portion 42 is, for example, more than 100% of the width of the positive lead 20, and more preferably more than 110% and less than or equal to 150%.

[0041] When a passage portion 42 is formed in the support portion 40b, and the top surface of the support portion 40b is viewed from above in the thickness direction of the upper insulating plate 22, it is preferable that the area of ​​the passage portion 42 is smaller than the area in which the top surface of the support portion 40b contacts the sealing body 17. In other words, it is preferable that the area in which the support portion 40b contacts the sealing body 17 is larger than the area of ​​the passage portion 42. With the above configuration, an area in which the support portion 40b contacts the sealing body 17 is secured, so that deformation of the sealing body 17 can be suppressed more effectively.

[0042] Furthermore, as shown in Figure 5B, it is preferable that the horizontal length of the through portion 42 be longer than the length of the area where the positive electrode lead 20 is placed. In other words, because variations in the length of the positive electrode lead 20 or variations in the portion that is bent can cause variations in the length of the area where the positive electrode lead 20 is placed, it is preferable to leave some leeway in the length of the through portion 42 and to provide a gap 42a. In Figure 5B, the gap 42a is formed by making the through portion 42 penetrate from one radial side surface to the other radial side surface of the support portion 40b.

[0043] As shown in FIG. 5C, the support portion 40b may have both a through portion 41 formed on the bottom surface of the support portion 40b and a through portion 42 formed on the top surface of the support portion 40b. Even in this case, it is preferable that the top surface of the support portion 40b and the bottom surface of the sealing body 17 are in direct contact and support each other. According to this configuration, damage to the positive electrode lead 20 is suppressed by the through portion 41, and by forming the through portion 42, the positive electrode lead 20 can be connected to the bottom surface of the sealing body 17 while the sealing body 17 can be directly supported by the support portion 40b.

[0044] As described above, according to the cylindrical battery 10 having the above configuration, deformation of the sealing body 17 can be suppressed. As a result, it is possible to suppress a decrease in the stability of the battery dimensions, a decrease in airtightness, a fluctuation in the operating pressure of the current interruption mechanism, etc., and a decrease in battery performance.

[0045] Note that the above embodiment can be appropriately modified in design without impairing the object of the present disclosure. For example, in the above embodiment, the case where the support portion 40 is separate from the upper insulating plate 22 has been illustrated and described, but the support portion 40 and the upper insulating plate 22 may be integrated as illustrated in FIG. 6. By integrating the support portion 40 and the upper insulating plate 22, positioning during the arrangement of the support portion 40 becomes unnecessary, and productivity is improved. Also, since the positioning is accurately performed, the sealing body 17 can be supported more accurately, and deformation of the sealing body 17 can be effectively suppressed.

[0046] Also, although the through portion 41 formed in the support portion 40b has been described as being formed by cutting out the bottom surface of the support portion 40b, for example, it may be formed by drilling through the support portion 40b. Specifically, the through portion 41 may be a hole that penetrates in the radial direction of the support portion 40b at the central portion in the height direction of the support portion 40b. According to this, since there is no need to cut out the bottom surface of the support portion 40b to form the through portion 41, the contact area between the bottom surface of the support portion 40b and the upper insulating plate 22 can be maintained. As a result, the stability of the support portion 40b is ensured, and deformation of the sealing body 17 can be more effectively suppressed.

[0047] This disclosure is further illustrated by the following embodiments. Configuration 1: A cylindrical battery comprising: an electrode body having a positive electrode, a negative electrode, and a separator, formed by winding the positive electrode and the negative electrode via the separator; a bottomed cylindrical outer casing housing the electrode body; a sealing body closing the opening of the outer casing; and an insulating plate disposed between the electrode body and the sealing body, wherein an insulating support portion is provided on the upper surface of the insulating plate facing the sealing body to support the sealing body. Configuration 2: The cylindrical battery according to Configuration 1, wherein the sealing body has a flange portion extending radially outward from a central portion, and the support portion supports the flange portion. Configuration 3: The cylindrical battery according to Configuration 1, wherein the sealing body has a flange portion extending radially outward from a central portion, and the support portion supports the central portion. Configuration 4: A cylindrical battery according to Configuration 3, wherein leads extending from the electrode body are connected to the sealing body, and the support portion has a passing portion configured to allow the leads to pass through. Configuration 5: A cylindrical battery according to Configuration 4, wherein the passing portion is formed on the surface of the support portion facing the insulating plate, and when the support portion is viewed from the thickness direction of the insulating plate, the area of ​​the passing portion is smaller than the area in contact with the insulating plate by the support portion. Configuration 6: A cylindrical battery according to Configuration 4, wherein the passing portion is formed on the surface of the support portion facing the sealing body, and when the support portion is viewed from the thickness direction of the insulating plate, the area of ​​the passing portion is smaller than the area in contact with the sealing body by the support portion. Configuration 7: A cylindrical battery according to Configuration 1, wherein the sealing body has a flange portion extending radially outward from the central portion, and the support portion has a separate support portion that supports the central portion and the flange portion. Configuration 8: The cylindrical battery according to any one of Configurations 1 to 7, wherein the support portion is integrated with the insulating plate.

[0048] 10 Cylindrical battery 11 Positive electrode 12 Negative electrode 13 Separator 14 Electrode body 15 Outer casing 16 Grooved section 17 Sealing body 17a Center section 17b Flange section 17c Inclined section 17d Annular groove 17e Annular end section 18 Crimped section 20 Positive electrode lead 21 Negative electrode lead 22 Upper insulating plate 23 Lower insulating plate 30 Gasket 40, 40a, 40b Support section 41, 42 Pass-through section 42a Gap

Claims

1. A cylindrical battery comprising: an electrode body having a positive electrode, a negative electrode, and a separator, formed by winding the positive electrode and the negative electrode with the separator in between; a bottomed cylindrical outer casing for housing the electrode body; a sealing body for closing the opening of the outer casing; and an insulating plate disposed between the electrode body and the sealing body, wherein an insulating support portion for supporting the sealing body is provided on the upper surface of the insulating plate facing the sealing body.

2. The cylindrical battery according to claim 1, wherein the sealing body has a flange portion extending radially outward from the central portion of the sealing body, and the support portion supports the flange portion.

3. The cylindrical battery according to claim 1, wherein the sealing body has a flange portion extending radially outward from the central portion of the sealing body, and the support portion supports the central portion.

4. A cylindrical battery according to claim 3, wherein leads extending from the electrode body are connected to the sealing body, and the support portion has a passing portion configured to allow the leads to pass through.

5. The cylindrical battery according to claim 4, wherein the through portion is formed on the surface of the support portion facing the insulating plate, and when the support portion is viewed from the thickness direction of the insulating plate, the area of ​​the through portion is smaller than the area of ​​the support portion in contact with the insulating plate.

6. The cylindrical battery according to claim 4, wherein the through portion is formed on the surface of the support portion facing the sealing body, and when the support portion is viewed from the thickness direction of the insulating plate, the area of ​​the through portion is smaller than the area of ​​the support portion in contact with the sealing body.

7. The cylindrical battery according to claim 1, wherein the sealing body has a flange portion extending radially outward from a central portion, and the support portion has a separate support portion that supports the central portion and the flange portion.

8. The cylindrical battery according to any one of claims 1 to 7, wherein the support portion is integrated with the insulating plate.

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