Cylindrical battery

Abstract

This cylindrical battery is characterized by comprising: an electrode body in which a positive electrode and a negative electrode are wound via a separator; a non-aqueous electrolyte; a bottomed cylindrical exterior can that accommodates the electrode body and the non-aqueous electrolyte; a sealing body that closes the opening of the exterior can; and an insulating plate (30) that is disposed between the electrode body and the sealing body and has a through-hole (32). The cylindrical battery is further characterized in that the surface of the insulating plate (30) on the electrode body side is provided with a protrusion (33) extending toward the electrode body along the edge of the through-hole (32) in a region facing the electrode body.

Description

Cylindrical battery

[0001] The present disclosure relates to cylindrical batteries.

[0002] Conventionally, cylindrical batteries have been known that include a wound electrode assembly, a nonaqueous electrolyte, a cylindrical outer can with a bottom that houses the electrode assembly and the nonaqueous electrolyte, a sealing member that closes the opening of the outer can, and an insulating plate disposed between the electrode assembly and the sealing member. The insulating plate electrically insulates the electrode assembly from the sealing member and prevents the occurrence of internal short circuits. Patent Document 1 discloses a cylindrical battery that includes an insulating plate with a plurality of through holes.

[0003] In general, in the manufacturing process of a cylindrical battery, after the electrode assembly is housed in an outer can, an insulating plate is placed on top of the electrode assembly. Then, with the insulating plate placed on top of the electrode assembly, a nonaqueous electrolyte is poured into the outer can. At this time, the nonaqueous electrolyte is poured into the outer can through a through-hole provided in the insulating plate.

[0004] Japanese Patent Application Laid-Open No. 2004-111105

[0005] However, when a non-aqueous electrolyte solution is poured into an outer can with an insulating plate disposed on top of the electrode assembly, it may take time for the non-aqueous electrolyte solution to pass through the through-holes provided in the insulating plate. From the viewpoint of realizing a cylindrical battery with high productivity, it is desired to shorten the pouring time of the non-aqueous electrolyte solution.

[0006] A cylindrical battery according to one aspect of the present disclosure comprises an electrode assembly in which a positive electrode and a negative electrode are wound with a separator interposed therebetween, a non-aqueous electrolyte, a cylindrical outer can with a bottom that houses the electrode assembly and the non-aqueous electrolyte, a sealing body that closes the opening of the outer can, and an insulating plate that is disposed between the electrode assembly and the sealing body and has at least one of a through hole and a notch, and is characterized in that a protrusion extending toward the electrode assembly is provided along at least one of the through hole and the notch on the surface of the insulating plate facing the electrode assembly in a region facing the electrode assembly.

[0007] According to the cylindrical battery of one aspect of the present disclosure, the time required for injecting the non-aqueous electrolyte can be shortened.

[0008] 6 is an axial cross-sectional view of a cylindrical battery that is an example of an embodiment; FIG. 7 is a perspective view of an upper insulating plate that constitutes a cylindrical battery that is an example of an embodiment, viewed from the electrode body side; FIG. 8 is a plan view of an upper insulating plate that constitutes a cylindrical battery that is an example of an embodiment, viewed from the electrode body side; FIG. 9 is a cross-sectional view along line A-A in FIG. 3; FIG. 10 is a plan view of an upper insulating plate that constitutes a cylindrical battery that is another example of an embodiment, viewed from the electrode body side; FIG. 11 is a plan view of an upper insulating plate that constitutes a cylindrical battery that is another example of an embodiment, viewed from the sealing body side; and FIG. 12 is a cross-sectional view along line B-B in FIG.

[0009] An example of an embodiment of a cylindrical battery according to the present disclosure will be described in detail below with reference to the drawings. In the following description, specific shapes, materials, numerical values, directions, etc. are examples for facilitating understanding of the present invention and can be appropriately changed according to the specifications of the cylindrical battery. Furthermore, when multiple embodiments and variations are included in the following description, it is assumed from the outset that their characteristic features can be appropriately combined and used.

[0010] Fig. 1 is an axial cross-sectional view of a cylindrical battery 10 according to an embodiment. The cylindrical battery 10 shown in Fig. 1 includes an electrode assembly 14, a nonaqueous electrolyte (not shown), and a cylindrical outer can 15 with a bottom that houses the electrode assembly 14 and the nonaqueous electrolyte. The cylindrical battery 10 also includes a sealing body 20 that closes an opening 15a of the outer can 15, and an upper insulating plate 30 that serves as an insulating plate and is disposed between the electrode assembly 14 and the sealing body 20. For ease of explanation, the sealing body 20 side will be referred to as the "top" and the bottom side of the outer can 15 as the "bottom."

[0011] The positive electrode 11, negative electrode 12, and separator 13 that make up the electrode assembly 14 are all long, strip-like bodies that are spirally wound and alternately stacked in the radial direction of the electrode assembly 14. A hollow portion 19 is formed in the winding core of the electrode assembly 14. The separator 13 is formed to be slightly larger than the positive electrode 11 and the negative electrode 12. That is, the separator 13 is formed to be longer in the longitudinal direction and width direction than the positive electrode 11 and the negative electrode 12. The electrode assembly 14 has a positive electrode lead 16 connected to the positive electrode 11 by welding or the like, and a negative electrode lead 17 connected to the negative electrode 12 by welding or the like.

[0012] The positive electrode 11 includes a strip-shaped positive electrode current collector and positive electrode mixture layers formed on both sides of the positive electrode current collector. Examples of the positive electrode current collector include a foil of a metal such as aluminum, and a film having such a metal disposed on its surface.

[0013] The positive electrode mixture layer is produced by applying a positive electrode mixture slurry containing, for example, a positive electrode active material, a conductive agent, a binder, and a solvent such as N-methyl-2-pyrrolidone (NMP) to both sides of a positive electrode current collector, followed by drying and compression. Examples of the positive electrode active material include lithium transition metal composite oxides containing transition metal elements such as Co, Mn, and Ni. Examples of the conductive agent include carbon materials such as carbon black (CB), acetylene black (AB), Ketjen black, and graphite. Examples of the binder include fluorine-based resins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polyimide (PI), acrylic resins, and polyolefin resins.

[0014] The negative electrode 12 includes a strip-shaped negative electrode current collector and a negative electrode mixture layer formed on both sides of the negative electrode current collector. Examples of the negative electrode current collector include a foil of a metal such as copper, and a film having such a metal disposed on its surface.

[0015] The negative electrode mixture layer is produced, for example, by applying a negative electrode mixture slurry containing a negative electrode active material, a binder, water, etc. to both sides of a negative electrode current collector, followed by drying and compression. Examples of the negative electrode active material include carbon materials such as natural graphite and artificial graphite, metals that alloy with lithium such as Si and Sn, or alloys and oxides containing these. Examples of the binder include styrene-butadiene rubber (SBR), CMC or its salts, polyacrylic acid or its salts, polyvinyl alcohol, etc.

[0016] A porous sheet having ion permeability and insulating properties is used as the separator 13. Specific examples of the porous sheet include a microporous thin film, a woven fabric, and a nonwoven fabric. The separator 13 is preferably made of an olefin resin such as polyethylene or polypropylene.

[0017] The nonaqueous solvent (organic solvent) of the nonaqueous electrolyte solution contained in the outer can 15 can be carbonates, lactones, ethers, ketones, esters, etc., and two or more of these solvents can be mixed and used. When two or more solvents are mixed and used, it is preferable to use a mixed solvent containing a cyclic carbonate and a chain carbonate. For example, ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), etc. can be used as the cyclic carbonate, and dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), etc. can be used as the chain carbonate. The electrolyte salt of the nonaqueous electrolyte solution can be LiPF ６ , LiBF ４ , LiCF ３ SO ３ The amount of electrolyte salt dissolved in the non-aqueous solvent can be, for example, 0.5 mol / L or more and 2.0 mol / L or less.

[0018] An upper insulating plate 30 and a lower insulating plate 18 are provided above and below the electrode body 14. The positive electrode lead 16 extends upward through a first through-hole 31 (see FIG. 3 ) described below in the upper insulating plate 30 and is welded to the underside of the filter 21, which is the bottom plate of the sealing body 20. As a result, in the cylindrical battery 10, the cap 25, which is the top plate of the sealing body 20 and is electrically connected to the filter 21, serves as the positive electrode terminal. The negative electrode lead 17 extends toward the bottom of the outer can 15 through a through-hole 18A provided in the center of the lower insulating plate 18 and is welded to the inner surface of the bottom of the outer can 15. As a result, in the cylindrical battery 10, the outer can 15 serves as the negative electrode terminal.

[0019] The exterior can 15 is a cylindrical metal body with a bottom, and has a grooved portion 15b on the opening 15a side. The grooved portion 15b supports the sealing body 20 on its upper surface. The electrode assembly 14 and non-aqueous electrolyte are accommodated in the portion of the exterior can 15 below the grooved portion 15b. The grooved portion 15b is preferably present in an annular shape along the circumferential direction of the exterior can 15. The grooved portion 15b can be formed, for example, by pressing the side surface of the exterior can 15 from the outside.

[0020] The sealing body 20 has a filter 21, a lower valve body 22, an insulating member 23, an upper valve body 24, and a cap 25, which are layered in this order from the electrode body 14 side. The opening 15a of the outer can 15 is closed by the sealing body 20, thereby sealing the inside of the cylindrical battery 10. A gasket 26 is provided between the outer can 15 and the sealing body 20, ensuring the sealing of the inside of the battery and the insulation between the outer can 15 and the sealing body 20.

[0021] Each of the components constituting the sealing body 20 has, for example, a disk or ring shape, and all components except for the insulating member 23 are electrically connected to each other. The lower valve body 22 and the upper valve body 24 are connected to each other at their respective centers, with the insulating member 23 interposed between their respective peripheral edges. If the internal pressure of the battery increases due to abnormal heat generation or the like, for example, the lower valve body 22 may rupture, causing the upper valve body 24 to bulge toward the cap 25 and separate from the lower valve body 22, thereby cutting off the electrical connection between them. If the internal pressure increases further, the upper valve body 24 may rupture, allowing gas to be discharged through the vent hole 25a in the cap 25.

[0022] Next, the upper insulating plate 30 will be described in detail with further reference to Figures 2 to 4. Figure 2 is a perspective view of the upper insulating plate 30 as seen from the electrode body 14 side (lower side), Figure 3 is a plan view of the upper insulating plate 30 as seen from the electrode body 14 side, and Figure 4 is a cross-sectional view taken along line A-A in Figure 3. For ease of explanation, in Figure 3, the area where protrusions 33, which will be described later, are provided is shown hatched.

[0023] As shown in Figures 1 to 3, the upper insulating plate 30 has a circular shape in a plan view and is disposed between the electrode body 14 and the sealing body 20. In this embodiment, the upper insulating plate 30 is disposed opposite the electrode body 14, except for the area facing the hollow portion 19 on the center side of the electrode body 14. The upper insulating plate 30 electrically insulates the electrode body 14 from the sealing body 20. The upper insulating plate 30 also prevents the electrode body 14 from shifting when an impact or the like is applied to the cylindrical battery 10. The upper insulating plate 30 is made of, for example, polyolefin resin, epoxy resin, polyimide resin, or phenolic resin.

[0024] 2 and 3 , the upper insulating plate 30 has a first through hole 31 through which the positive electrode lead 16 passes and three second through holes 32 that are smaller than the first through hole 31 and through which the positive electrode lead 16 does not pass. When a non-aqueous electrolyte solution is injected during the battery manufacturing process, the non-aqueous electrolyte solution is accommodated inside the outer can 15 through the first through hole 31 and the second through hole 32. That is, the first through hole 31 and the second through hole 32 function as an injection port for the non-aqueous electrolyte solution. Furthermore, when gas is generated inside the battery due to abnormal heat generation in the electrode body 14, the gas is exhausted to the sealing body 20 side through the first through hole 31 and the second through hole 32. That is, the first through hole 31 and the second through hole 32 function as an exhaust port for the gas.

[0025] The first through hole 31 has a substantially semicircular shape and is provided in one half of the upper insulating plate 30 (the lower half of FIG. 3 ). The first through hole 31 has a shape that protrudes toward the center α of the upper insulating plate 30 near the center α. The shape of the first through hole 31 is not particularly limited as long as it allows the positive electrode lead 16 to pass through.

[0026] The ratio of the opening area of ​​the first through hole 31 to the area of ​​the circumscribing circle of the upper insulating plate 30 is, for example, 10% to 40% or less, and may be 15% to 35% or less. By setting the ratio of the opening area of ​​the first through hole 31 to the area of ​​the circumscribing circle of the upper insulating plate 30 to 10% to 40% or less, it becomes easy to pass the positive electrode lead 16 through the first through hole 31 while electrically insulating the electrode body 14 and the sealing body 20.

[0027] The second through holes 32 have a substantially oval shape and are provided in an arc shape centered at the center α of the upper insulating plate 30. As described above, the positive electrode lead 16 does not pass through the second through holes 32. In this embodiment, the three second through holes 32 each have the same shape. Note that the shape of the second through holes 32 is not limited thereto and may be, for example, a substantially circular shape. Furthermore, the number of second through holes 32 may be two or less, or four or more.

[0028] The proportion of the total opening area of ​​the second through holes 32 to the area of ​​the circumscribing circle of the upper insulating plate 30 is, for example, 30% or less, and preferably 25% or less. Setting the proportion of the total opening area of ​​the second through holes 32 to the area of ​​the circumscribing circle of the upper insulating plate 30 to 30% or less facilitates electrical insulation between the electrode body 14 and the sealing body 20. The lower limit of the proportion of the total opening area of ​​the second through holes 32 to the area of ​​the circumscribing circle of the upper insulating plate 30 is, for example, 5%.

[0029] On the lower surface of the upper insulating plate 30, in a region facing the electrode assembly 14, a protrusion 33 extending toward the electrode assembly 14 (downward) is provided along the second through-hole 32. The protrusion 33 is in contact with, for example, the upper surface of the separator 13 constituting the electrode assembly 14 or the side surface of the separator 13 on the upper end side.

[0030] As described above, the second through holes 32 are smaller than the first through holes 31. Therefore, when the nonaqueous electrolyte is injected into the exterior can 15, it may take some time for the nonaqueous electrolyte to pass through the second through holes 32. Therefore, by providing the protrusions 33 along the edges of the second through holes 32, the nonaqueous electrolyte that enters the second through holes 32 moves downward along the protrusions 33, contacts the separator 13, and permeates into the electrode assembly 14. This prevents the nonaqueous electrolyte from accumulating in the second through holes 32, thereby shortening the injection time for the nonaqueous electrolyte. Furthermore, the contact of the protrusions 33 with the separator 13 prevents the upper insulating plate 30 from shifting above the electrode assembly 14.

[0031] The protrusions 33 are preferably provided over an area of ​​50% or more of the entire circumference of the edges of adjacent second through holes 32, and more preferably over an area of ​​75% or more of the entire circumference of the edges of adjacent second through holes 32. By providing the protrusions 33 over an area of ​​50% or more of the entire circumference of the edges of adjacent second through holes 32, the nonaqueous electrolyte that has entered the second through holes 32 is more likely to move downward, thereby further shortening the injection time of the nonaqueous electrolyte. Note that the protrusions 33 may also be provided over the entire circumference of the edges of adjacent second through holes 32. This further shortens the injection time of the nonaqueous electrolyte. In this embodiment, the protrusions 33 are provided over the entire circumference of all second through holes 32.

[0032] As shown in FIG. 4 , the length (H) of the protrusions 33 in the axial direction (vertical direction) of the outer can 15 is preferably 0.10 mm or more, and more preferably 0.15 mm or more. By making the length of the protrusions 33 0.10 mm or more, the area in which the protrusions 33 contact the separator 13 can be increased. As a result, the nonaqueous electrolyte is further prevented from accumulating in the second through-holes 32, and the injection time of the nonaqueous electrolyte can be further shortened. The upper limit of the length of the protrusions 33 is, for example, 1.0 mm. By making the length of the protrusions 33 1.0 mm or less, the protrusions 33 are prevented from contacting the positive electrode 11 or the negative electrode 12 constituting the electrode assembly 14. As a result, damage to the positive electrode 11 and the negative electrode 12 caused by the protrusions 33 is suppressed. Therefore, the length of the protrusions 33 is preferably 0.10 mm or more and 1.0 mm or less, and more preferably 0.15 mm or more and 1.0 mm or less.

[0033] The protrusions 33 may extend in a direction inclined with respect to the axial direction (vertical direction) of the outer can 15, but preferably extend along the axial direction of the outer can 15. This makes it easier for the nonaqueous electrolyte solution that has entered the second through-holes 32 to move downward along the protrusions 33, thereby further shortening the time required for injecting the nonaqueous electrolyte solution.

[0034] The thickness of the upper insulating plate 30, excluding the region where the protrusions 33 are provided, is, for example, 0.10 mm or more and 1.0 mm or less, and may be 0.10 mm or more and 0.50 mm or less. A suitable example of the thickness of the upper insulating plate 30 is 0.30 mm.

[0035] In the above embodiment, the protrusion 33 is provided only in the second through hole 32, but the protrusion 33 may be provided in the first through hole 31 in addition to the second through hole 32. Furthermore, the number of first through holes 31 is not limited to one, and may be two or more.

[0036] Next, a modified example of the upper insulating plate 30 will be described with reference to Fig. 5. Fig. 5 is a plan view of a modified upper insulating plate 30X as seen from the electrode body 14 side. For ease of explanation, in Fig. 5, the area where the protrusions 33 are provided is shown hatched.

[0037] 5, the upper insulating plate 30X has a plurality of notches 34 extending radially inward on the outer circumferential edge of the upper insulating plate 30X. The upper insulating plate 30X has only the first through holes 31 and does not have the second through holes 32 (see FIG. 3).

[0038] 5, the first through-hole 31 has a semicircular arc shape and is provided in one half of the upper insulating plate 30X (the lower half of FIG. 5). Note that the shape of the first through-hole 31 is not limited thereto, and it may have, for example, the same shape as the upper insulating plate 30 shown in FIG.

[0039] The notches 34 have a generally semicircular shape and are provided at intervals around the entire circumference of the upper insulating plate 30X. In this embodiment, the notches 34 are provided at generally equal angular intervals in the circumferential direction. When a nonaqueous electrolyte solution is injected during the battery manufacturing process, the nonaqueous electrolyte solution is accommodated inside the exterior can 15 through the notches 34. In other words, the notches 34 function as injection ports for the nonaqueous electrolyte solution.

[0040] The proportion of the total opening area of ​​the notches 34 to the area of ​​the circumscribing circle of the upper insulating plate 30X is, for example, 30% or less, and preferably 25% or less. Setting the proportion of the total opening area of ​​the notches 34 to the area of ​​the circumscribing circle of the upper insulating plate 30X to 30% or less facilitates electrical insulation between the electrode body 14 and the sealing body 20. The lower limit of the proportion of the total opening area of ​​the notches 34 to the area of ​​the outline of the lower surface of the upper insulating plate 30X is, for example, 5%.

[0041] On the lower surface of the upper insulating plate 30X, in a region facing the electrode assembly 14, protrusions 33 extending toward the electrode assembly 14 (downward) are provided along the edges of the cutouts 34. In the example shown in FIG. 5 , in addition to the cutouts 34, protrusions 33 are provided along the edges of the first through-holes 31. By providing the protrusions 33 along the edges of the cutouts 34 and the first through-holes 31, the nonaqueous electrolyte that enters the cutouts 34 or the first through-holes 31 moves downward along the protrusions 33, comes into contact with the separator 13, and permeates into the electrode assembly 14. This prevents the nonaqueous electrolyte from accumulating in the cutouts 34 or the first through-holes 31, thereby shortening the time required for injecting the nonaqueous electrolyte.

[0042] 5, the upper insulating plate 30X does not have the second through holes 32, but the second through holes 32 may be provided in addition to the first through holes 31 and the cutouts 34. In addition, in the example shown in FIG. 5, the protrusions 33 are provided along the edges of all the cutouts 34, but the protrusions 33 may not be provided on some of the cutouts 34.

[0043] Next, modified examples of the upper insulating plate 30 will be further described with reference to Fig. 6 and Fig. 7. Fig. 6 is a plan view of a modified upper insulating plate 30Y as seen from the sealing body 20 side (upper side), and Fig. 7 is a cross-sectional view taken along line B-B in Fig. 6.

[0044] As shown in Fig. 6, the upper insulating plate 30Y has one first through hole 31 and three second through holes 32. The shapes and arrangement of the first through hole 31 and the second through holes 32 of the upper insulating plate 30Y are the same as those of the upper insulating plate 30 shown in Fig. 3. Furthermore, protrusions 33 are provided around the entire periphery of all of the second through holes 32.

[0045] 6 and 7 , a sloped region 35 that slopes toward the electrode body 14 (downward) as it approaches the edge of the second through-hole 32 is provided on the surface (top surface) of the upper insulating plate 30Y facing the sealing body 20, along the edge of the second through-hole 32. By providing the sloped region 35 on the top surface of the upper insulating plate 30Y, when the nonaqueous electrolyte solution is poured into the exterior can 15, the nonaqueous electrolyte solution present near the second through-hole 32 can easily flow along the sloped region 35 into the second through-hole 32. As a result, the time required for pouring the nonaqueous electrolyte solution can be further shortened.

[0046] The inclined regions 35 are preferably provided over 50% or more of the entire circumference of the edges of adjacent second through holes 32, and more preferably over 75% or more of the entire circumference of the edges of the second through holes 32. By providing the inclined regions 35 over 50% or more of the entire circumference of the edges of adjacent second through holes 32, the nonaqueous electrolyte can more easily enter the second through holes 32, thereby further shortening the injection time of the nonaqueous electrolyte. Note that the inclined regions 35 may be provided over the entire circumference of the edges of adjacent second through holes 32. This further shortens the injection time of the nonaqueous electrolyte. In this embodiment, the inclined regions 35 are provided over the entire circumference of all second through holes 32.

[0047] As shown in FIG. 7 , the width (W) of the inclined region 35 is preferably 0.10 mm or more, and more preferably 0.20 mm or more. By making the width of the inclined region 35 0.10 mm or more, the nonaqueous electrolyte can more easily enter the second through-hole 32, thereby further shortening the injection time of the nonaqueous electrolyte. Furthermore, the upper limit of the width of the inclined region 35 is, for example, 2.0 mm. By making the width of the inclined region 35 2.0 mm or less, the volume of the upper insulating plate 30Y can be ensured, and it becomes easier to ensure the strength of the upper insulating plate 30Y. Therefore, the width of the inclined region 35 is preferably 0.10 mm or more and 2.0 mm or less, and more preferably 0.20 mm or more and 2.0 mm or less.

[0048] In the inclined region 35, the inclination angle of the upper surface of the upper insulating plate 30Y with respect to the radial direction is, for example, 5° or more, and may be 10° or more. By increasing the inclination angle of the upper surface of the upper insulating plate 30Y with respect to the radial direction, the nonaqueous electrolyte present near the second through holes 32 is more likely to enter the second through holes 32 through the inclined region 35. Furthermore, the upper limit of the inclination angle of the upper surface of the upper insulating plate 30Y with respect to the radial direction is, for example, 60°. Therefore, the inclination angle of the upper surface of the upper insulating plate 30Y with respect to the radial direction is, for example, 5° or more and 60° or less, and may be 10° or more and 60° or less.

[0049] In the examples shown in Figures 6 and 7, the inclined region 35 is provided only in the second through hole 32, but the inclined region 35 may be provided in the first through hole 31 in addition to the second through hole 32.

[0050] The present disclosure is further described by the following embodiments. Configuration 1: A cylindrical battery comprising: an electrode assembly in which a positive electrode and a negative electrode are wound with a separator interposed therebetween; a non-aqueous electrolyte; a cylindrical outer can with a bottom that houses the electrode assembly and the non-aqueous electrolyte; a sealing member that closes the opening of the outer can; and an insulating plate that is disposed between the electrode assembly and the sealing member and has at least one of a through hole and a notch, wherein a protrusion that extends toward the electrode assembly is provided on the surface of the insulating plate facing the electrode assembly in an area facing the electrode assembly, along an edge of at least one of the through hole and the notch. Configuration 2: The cylindrical battery according to Configuration 1, wherein the protrusion is provided over a range of 50% or more of the entire circumference of the edge of an adjacent through hole or the notch. Configuration 3: The cylindrical battery according to Configuration 1 or 2, wherein the protrusion is provided around the entire circumference of the edge of an adjacent through hole or the notch. The cylindrical battery according to any one of configurations 1 to 4, wherein the length of the protrusion in the axial direction of the outer can is 0.10 mm or more and 1.0 mm or less. The cylindrical battery according to any one of configurations 1 to 4, wherein the surface of the insulating plate facing the sealing body has an inclined region that inclines toward the electrode body as it approaches the edge of the through hole or the notch, along the edge of at least one of the through hole and the notch.

[0051] REFERENCE SIGNS LIST 10 Cylindrical battery, 11 Positive electrode, 12 Negative electrode, 13 Separator, 14 Electrode body, 15 Outer can, 15a Opening, 15b Grooved portion, 16 Positive electrode lead, 17 Negative electrode lead, 18 Lower insulating plate, 18A Through hole, 19 Hollow portion, 20 Sealing body, 21 Filter, 22 Lower valve body, 23 Insulating member, 24 Upper valve body, 25 Cap, 25a Ventilation hole, 30, 30X, 30Y Upper insulating plate (insulating plate), 31 First through hole, 32 Second through hole, 33 Protrusion, 34 Notch, 35 Sloped region

Claims

1. A cylindrical battery comprising: an electrode body in which a positive electrode and a negative electrode are wound with a separator interposed therebetween; a non-aqueous electrolyte; a bottomed cylindrical outer can that houses the electrode body and the non-aqueous electrolyte; a sealing body that closes an opening of the outer can; and an insulating plate disposed between the electrode body and the sealing body and having at least one of a through hole and a notch, wherein a protrusion extending toward the electrode body side is provided along an edge of at least one of the through hole and the notch in a region facing the electrode body on a surface of the insulating plate on the electrode body side.

2. The cylindrical battery according to claim 1, wherein the protrusion is provided in a range of 50% or more of the entire circumference of an edge of an adjacent through hole or notch.

3. The cylindrical battery according to claim 1, wherein the protrusion is provided over the entire circumference of an edge of an adjacent through hole or notch.

4. The cylindrical battery according to claim 1, wherein a length of the protrusion in an axial direction of the outer can is 0.10 mm or more and 1.0 mm or less.

5. The cylindrical battery according to claim 1, wherein an inclined region that inclines toward the electrode body side as it approaches an edge of the through hole or the notch is provided along the edge of the through hole or the notch on a surface of the insulating plate on the sealing body side.

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