Non-aqueous electrolyte secondary battery

Abstract

A non-aqueous electrolyte secondary battery (10) is characterized by comprising an outer packaging can (20) in the shape of a bottomed cylindrical container (20) containing an electrode body, a non-aqueous electrolyte, a sealing body (30) sealing the opening (24) of the outer packaging can (20), an annular gasket (34) disposed between the outer packaging can (20) and the sealing body (30), and a protective member (40) disposed between the outer packaging can (20) and the gasket (34). The outer packaging can (20) has a chiseling portion (26) extending radially inward and chiseling to fix the sealing body, and the protective member (40) has an exposed portion (41) disposed radially inward relative to the radially inner end (26A) of the chiseling portion (26).

Description

Technical Field

[0001] This invention relates to a non-aqueous electrolyte secondary battery. Background Technology

[0002] Conventional non-aqueous electrolyte secondary batteries are known to have a bottomed cylindrical outer packaging can containing electrodes and a non-aqueous electrolyte, and a sealing body that seals the opening of the outer packaging can. The non-aqueous electrolyte secondary battery seals its interior by tightly fixing the sealing body between an annular groove formed on the side of the outer packaging can and the opening of the outer packaging can. Patent Document 1 discloses a non-aqueous electrolyte secondary battery containing a sealant comprising a soft polymer and an imidazole compound, for the purpose of improving the airtightness of the non-aqueous electrolyte secondary battery and suppressing leakage of the non-aqueous electrolyte.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-014371 Summary of the Invention

[0006] However, even with improved sealing of non-aqueous electrolyte secondary batteries, it is difficult to completely suppress leakage of the non-aqueous electrolyte. Once leakage occurs, the non-aqueous electrolyte comes into contact with the outer packaging can, potentially causing rusting. Therefore, preventing rusting of the outer packaging can in the event of non-aqueous electrolyte leakage is an important issue.

[0007] The non-aqueous electrolyte secondary battery, as an embodiment of the present invention, is characterized by comprising: an electrode body having a positive electrode and a negative electrode, a non-aqueous electrolyte, a bottomed cylindrical outer packaging can containing the electrode body and the non-aqueous electrolyte, a sealing body sealing the opening of the outer packaging can, an annular gasket disposed between the outer packaging can and the sealing body, and a protective member disposed between the outer packaging can and the gasket. The outer packaging can has a clamping portion extending radially inward and clamping the sealing body, and the protective member has an exposed portion disposed radially inward relative to the radially inner end of the clamping portion.

[0008] According to the non-aqueous electrolyte secondary battery, which is one aspect of the present invention, rusting of the outer packaging can be suppressed even in the event of leakage of the non-aqueous electrolyte. Attached Figure Description

[0009] Figure 1 This is an axial cross-sectional view of a non-aqueous electrolyte secondary battery as an example of an implementation method.

[0010] Figure 2 Is Figure 1 A magnified view of the area near the opening.

[0011] Figure 3 Is Figure 2 The diagram schematically shows the flow of the non-aqueous electrolyte.

[0012] Figure 4 This is an axial cross-sectional view of a non-aqueous electrolyte secondary battery, which is another example of the embodiment. It is a view showing the vicinity of the opening magnified. Detailed Implementation

[0013] Hereinafter, an example of an embodiment of the non-aqueous electrolyte secondary battery of the present invention will be described in detail with reference to the accompanying drawings. The embodiment described below is merely an example, and the present invention is not limited to the following embodiment. Furthermore, the present invention includes the selective combination of the constituent elements of the embodiment described below.

[0014] Figure 1 This is an axial cross-sectional view of a non-aqueous electrolyte secondary battery 10, as an example of an embodiment. (See attached image.) Figure 1 As shown, the non-aqueous electrolyte secondary battery 10 includes: an electrode body 14, a non-aqueous electrolyte (not shown), and an outer packaging container 20 for containing the electrode body 14 and the non-aqueous electrolyte. The outer packaging container 20 is a bottomed cylindrical metal container with an opening on one axial side, and the opening 24 of the outer packaging container 20 is sealed by a sealing body 30. Hereinafter, the sealing body 30 side of the non-aqueous electrolyte secondary battery 10 in the axial (height direction) direction will be designated as "upper," and the bottom 21 side of the outer packaging container 20 in the axial direction will be designated as "lower."

[0015] The electrode body 14 has a positive electrode 11, a negative electrode 12, and a spacer 13, and has a structure in which the positive electrode 11 and negative electrode 12 are wound into a spiral shape with the spacer 13 sandwiched between them. The positive electrode 11, negative electrode 12, and spacer 13 are all strip-shaped materials, which are alternately stacked along the radial direction of the electrode body 14 by being wound into a spiral shape. In order to prevent lithium deposition, the negative electrode 12 is formed to be one size larger than the positive electrode 11. That is, the negative electrode 12 is longer in both the length direction and the width direction (short side direction) compared to the positive electrode 11. The spacer 13 is formed to be at least one size larger than the positive electrode 11, for example, two pieces are arranged to sandwich the positive electrode 11. The non-aqueous electrolyte secondary battery 10 has insulating plates 16 and 17 respectively disposed on the upper and lower parts of the electrode body 14.

[0016] The positive electrode 11 has a positive electrode core and a positive electrode binder layer formed on the positive electrode core. The positive electrode core can be a foil of a metal that is stable in the potential range of the positive electrode 11, such as aluminum or an aluminum alloy, or a film of the same metal disposed on its surface. The positive electrode binder layer contains a positive electrode active material, a conductive agent, and a binder, and is preferably formed on both sides of the positive electrode core except for the exposed portion of the positive electrode core where the positive electrode lead 18 is soldered. For example, the positive electrode 11 can be manufactured by coating the positive electrode core with a positive electrode binder slurry containing a positive electrode active material, a conductive agent, and a binder, drying the coating, and then compressing it.

[0017] The positive electrode layer, serving as the positive electrode active material, contains particulate lithium metal composite oxides. These lithium metal composite oxides are composite oxides containing metal elements such as Co, Mn, Ni, and Al in addition to Li. The metal elements constituting the lithium metal composite oxide are, for example, at least one selected from Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Sn, Sb, W, Pb, and Bi. Preferably, it contains at least one selected from Co, Ni, and Mn. Examples of suitable composite oxides include lithium metal composite oxides containing Ni, Co, and Mn, and lithium metal composite oxides containing Ni, Co, and Al.

[0018] Examples of conductive agents contained in the positive electrode binder layer include carbon black such as acetylene black and Ketjen black, graphite, carbon nanotubes (CNTs), carbon nanofibers, and graphene. Examples of binders contained in the positive electrode binder layer include fluorinated resins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polyimide, acrylic resins, and polyolefins. Additionally, these resins can be used in combination with carboxymethyl cellulose (CMC) or its salts, polyethylene oxide (PEO), etc.

[0019] The negative electrode 12 has a negative electrode core and a negative electrode binder layer formed on the negative electrode core. The negative electrode core can be a foil of a metal that is stable in the potential range of the negative electrode 12, such as copper or a copper alloy, or a film of the same metal disposed on its surface. The negative electrode binder layer contains a negative electrode active material, a binder, and a conductive agent used as needed, and is preferably formed on both sides of the negative electrode core except for the exposed portion of the negative electrode core where the negative electrode lead 19 is soldered. A negative electrode binder slurry containing a negative electrode active material and a binder is coated on the surface of the negative electrode core, and after the coating film dries, it is compressed to form a negative electrode binder layer on both sides of the negative electrode core, thereby manufacturing the negative electrode 12.

[0020] In the negative electrode composite layer, the negative electrode active material typically includes a carbon material that reversibly adsorbs and releases lithium ions. Suitable examples of carbon materials include natural graphite such as flake graphite, block graphite, and amorphous graphite, as well as artificial graphite such as blocky graphite (MAG) and graphitized mesophase carbon microspheres (MCMB). Alternatively, materials containing at least one of elements alloyed with Li, such as Si and Sn, or materials containing these elements can also be used as the negative electrode active material. Composite materials containing Si are preferred.

[0021] Suitable examples of Si-containing composite materials include materials in which Si particles are dispersed in a SiO2 phase or a silicate phase such as lithium silicate, or materials in which Si particles are dispersed in an amorphous carbon phase. A conductive layer, such as a carbon film, is formed on the particle surface of this composite material.

[0022] The binder included in the negative electrode binder layer can also be made of fluorinated resins, PAN, polyimide, acrylic resins, polyolefins, etc., similar to that used in the positive electrode binder layer; however, styrene-butadiene rubber (SBR) is preferred. Furthermore, the negative electrode binder layer preferably contains CMC or its salts, polyacrylic acid (PAA) or its salts, polyvinyl alcohol (PVA), etc. It is suitable to use SBR in combination with CMC or its salts, PAA or its salts, etc. Conductive agents such as CNTs may also be included in the negative electrode binder layer.

[0023] The spacer 13 is a porous sheet with ion permeability and insulation. Specific examples of porous sheets include microporous films, woven fabrics, and nonwoven fabrics. Suitable materials for the spacer 13 include polyolefins such as polyethylene and polypropylene, and cellulose. The spacer 13 can be a single-layer structure or a multi-layer structure. Furthermore, a resin layer with high heat resistance, such as an aromatic polyamide resin, can be formed on the surface of the spacer 13. At the interface between the spacer 13 and at least one of the positive electrode 11 and the negative electrode 12, a filler layer containing inorganic filler can be formed.

[0024] A positive lead 18 is connected to the positive electrode 11, and a negative lead 19 is connected to the winding end side of the negative electrode 12. The positive lead 18 passes through the through hole of the insulating plate 16 and extends towards the sealing body 30, while the negative lead 19 passes through the outside of the insulating plate 17 and extends towards the bottom 21 of the outer packaging can 20. The positive lead 18 is connected to the lower surface of the internal terminal plate 31 of the sealing body 30 by welding or the like, making the sealing body 30 the positive terminal. The negative lead 19 is connected to the inner surface of the bottom 21 of the metal outer packaging can 20 by welding or the like, making the outer packaging can 20 the negative terminal.

[0025] As the non-aqueous solvent (organic solvent) for the non-aqueous electrolyte contained in the outer packaging container 20, carbonates, lactones, ethers, ketones, esters, etc., can be used, or two or more of these solvents can be mixed. When using two or more solvents, a mixed solvent containing cyclic carbonates and chain carbonates is preferred. For example, ethylene carbonate (EC), propylene carbonate (PC), butenyl carbonate (BC), etc., can be used as cyclic carbonates, and dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC), etc., can be used as chain carbonates. As the electrolyte salt for the non-aqueous electrolyte, LiPF6, LiBF4, LiCF3SO3, etc., and mixtures thereof can be used. The solubility of the electrolyte salt in the non-aqueous solvent can be, for example, set to 0.5 mol / L or more and 2.0 mol / L or less.

[0026] The outer packaging can 20 is a bottomed cylindrical metal container with an opening on one axial side. The outer packaging can 20 has a bottom 21 and a side portion 22 that forms the side of the non-aqueous electrolyte secondary battery 10. The side portion 22 is the part of the outer packaging can 20 excluding the bottom 21, and includes the slotted portion 23 and the opening portion 24 described later.

[0027] The slotted portion 23 is a portion of the side portion 22 that is recessed radially inward, and is arranged in a ring shape along the circumference of the outer packaging can 20. The slotted portion 23 supports the sealing body 30 with its upper surface. The slotted portion 23 can be formed, for example, by spinning a portion of the side portion 22 radially inward to make it recessed radially inward.

[0028] The opening 24 is the area on the upper side of the side portion 22 compared to the slotted portion 23, forming the opening of the outer packaging can 20. When the sealing body 30 is tightened and fixed to the outer packaging can 20, the opening 24 bends radially inward. Thus, an opening side portion 25 and a tightening portion 26 are formed in the opening 24. The opening side portion 25 forms part of the side of the non-aqueous electrolyte secondary battery 10 and covers the outer peripheral surface of the liner 34. The tightening portion 26 forms part of the upper surface of the non-aqueous electrolyte secondary battery 10 and extends radially inward. Furthermore, the radially inner end 26A of the tightening portion 26 (refer to...) Figure 2 Compared to the radial inner end 34A of the gasket 34 (refer to...) Figure 2 Located radially outward. That is, a portion of the upper surface of the gasket 34 is not covered by the hemmed portion 26. As detailed later, a protective tape 40, serving as a protective element, is disposed between the opening 24 of the outer packaging can 20 and the gasket 34.

[0029] The sealing body 30 is a circular plate-shaped component equipped with a safety valve. The sealing body 30 has a structure in which an inner terminal plate 31, an insulating member 32, and an outer terminal plate 33 are stacked sequentially from the electrode body 14 side.

[0030] The internal terminal plate 31 is a metal plate comprising a thick-walled portion 31A and a thin-walled central portion 31B. The thick-walled portion 31A is used to connect the positive electrode lead 18, and the central portion 31B disconnects from the thick-walled portion 31A when the internal pressure of the battery exceeds a predetermined threshold. A plurality of vent holes 31C are formed in the thick-walled portion 31A.

[0031] The insulating member 32 insulates the portion of the inner terminal plate 31 from the connection portion of the outer terminal plate 33. In the insulating member 32, an opening 32A is formed in the radial center portion, and a vent hole 32B is formed in the portion that overlaps with the vent hole 31C of the inner terminal plate 31.

[0032] The outer terminal plate 33 forms part of the upper surface of the non-aqueous electrolyte secondary battery 10 and is disposed opposite to the inner terminal plate 31, sandwiched between an insulating member 32. The outer terminal plate 33 has a thin-walled portion 33A that breaks when the internal pressure of the non-aqueous electrolyte secondary battery 10 exceeds a predetermined threshold. The outer terminal plate 33 is connected to the central portion 31B of the inner terminal plate 31 by welding or the like at its radial center. In addition, the outer terminal plate 33 is sandwiched between a gasket 34 on its radial outer side between a gouging portion 26 and a slotted portion 23 formed by bending the opening of the outer packaging can 20 inward.

[0033] When an anomaly occurs in the non-aqueous electrolyte secondary battery 10 and the internal pressure rises, the generated high-temperature gas pushes the internal terminal plate 31 upwards, causing it to break and detach the central portion 31B from the thick-walled portion 31A. The external terminal plate 33 deforms, protruding outwards from the battery. This cuts off the current path in the sealing body 30. Subsequently, after the current path is cut off, if the internal pressure of the non-aqueous electrolyte secondary battery 10 rises further, the thin-walled portion 33A of the external terminal plate 33 breaks, forming a gas outlet on the external terminal plate 33.

[0034] It should be noted that the structure of the sealing body 30 is not limited to Figure 1 The structure shown. The sealing body 30 may also have, for example, a convex cap that covers the outer terminal plate 33.

[0035] The gasket 34 is a flexible insulating component that electrically isolates the sealing body 30 (as the positive terminal) from the outer packaging can 20 (as the negative terminal) while ensuring the airtightness of the interior of the outer packaging can 20 by being compressed in the vertical direction. The material of the gasket 34 is not particularly limited as long as it is a compressible insulating material; for example, polypropylene (PP), polyphenylene sulfide (PPS), polyethylene (PE), polybutylene terephthalate (PBT), perfluoroalkoxyalkylene (PFA), polytetrafluoroethylene (PTFE), and polyamide (PA) can be used.

[0036] Below, in reference Figure 2 and Figure 3 At the same time, the sealed state of the opening 24 of the non-aqueous electrolyte secondary battery 10 and the protective tape 40 as a protective component will be explained. Figure 2 This is an enlarged image of the area around opening 24. Figure 3 Is Figure 2 The diagram illustrates the movement path of the non-aqueous electrolyte.

[0037] like Figure 2 As shown, a protective tape 40, serving as a protective component, is disposed between the opening 24 and the gasket 34 of the outer packaging can 20. Specifically, the protective tape 40 is disposed between the opening 24 and the upper surface 34B and side surface 34C of the gasket 34. The protective tape 40 adheres to the inner surface of the opening 24.

[0038] Here, the protective tape 40 has an exposed portion 41 disposed radially inward relative to the radially inner end 26A of the clamping portion 26. That is, the exposed portion 41 is not covered by the clamping portion 26, but is disposed in a state where the upper surface is exposed.

[0039] like Figure 3 As shown, non-aqueous electrolyte inside the outer packaging can 20 may sometimes penetrate the interface between the protective tape 40 and the gasket 34 due to impacts from outside the battery. The infiltrated non-aqueous electrolyte then moves towards the upper part of the battery along the gap between the protective tape 40 and the gasket 34, potentially leaking out of the battery. At this time, because the protective tape 40 has an exposed portion 41, the movement of the leaking non-aqueous electrolyte towards the clamping portion 26 is hindered. As a result, rusting of the outer packaging can 20 caused by the clamping portion 26 contacting the non-aqueous electrolyte can be suppressed. In other words, if the protective tape 40 did not have an exposed portion 41, the non-aqueous electrolyte leaking from the interface between the protective tape 40 and the gasket 34 would contact the clamping portion 26 and rust inside the outer packaging can 20. When rust occurs inside the outer packaging can 20, it not only results in poor appearance but may also reduce battery performance, which is undesirable.

[0040] like Figure 2 As shown, the radially inner end 41A of the exposed portion 41 is preferably positioned radially inner than the radially inner end 34A of the pad 34. That is, the upper surface 34B of the pad 34 is preferably covered by the protective tape 40. In this case, non-aqueous electrolyte leaking from the interface between the protective tape 40 and the pad 34 to the outside of the battery tends to flow towards the central part of the battery. As a result, the leakage of non-aqueous electrolyte into contact with the sealing portion 26 is further suppressed.

[0041] The radial length of the exposed portion 41 is preferably 0.10 mm or more, more preferably 0.15 mm or more, and even more preferably 0.20 mm or more. Here, the radial length of the exposed portion 41 refers to the length along the radial direction of the outer packaging can 20 from the radial inner end 26A of the sealing portion 26 to the radial inner end 41A of the exposed portion 41. By setting the radial length of the exposed portion 41 to 0.10 mm or more, it is possible to further suppress the contact of non-aqueous electrolyte leaking from the interface between the protective tape 40 and the gasket 34 to the outside of the battery with the sealing portion 26. There is no particular upper limit to the radial length of the exposed portion 41, for example, it is 2.0 mm. It should be noted that when the protective tape 40 is conductive, the protective tape 40 needs to be arranged in a way that does not contact the sealing body 30.

[0042] The exposed portion 41 is preferably provided along the entire circumference of the outer packaging can 20. In this case, it is possible to prevent the non-aqueous electrolyte from contacting the sealing portion 26 along the entire circumference of the outer packaging can 20.

[0043] The protective tape 40, for example, has a substrate portion and an adhesive portion formed on one surface of the substrate portion. The substrate portion can be made of an insulating resin material or a conductive metal material. By providing the protective tape 40, the distance between the sealing body 30 and the outer packaging can 20 can be increased by an amount equivalent to the thickness of the protective tape 40. Therefore, by using an insulating material to construct the substrate portion, it is easy to ensure the insulation between the sealing body 30 and the outer packaging can 20. In addition, by using an insulating material to construct the substrate portion, even if the gasket 34 melts due to abnormal heating of the battery caused by an external short circuit, the protective tape 40 can still achieve insulation between the sealing body 30 and the outer packaging can 20. The thickness of the substrate portion is, for example, 5 μm or more and 50 μm or less, preferably 5 μm or more and 30 μm or less.

[0044] As the insulating resin material constituting the substrate, materials such as PI (polyimide), PP (polypropylene), PPS (polyphenylene sulfide), PEEK (polyether ether ketone), PET (polyethylene terephthalate), and PBT (polybutylene terephthalate) can be used. Among these, from the viewpoint of ensuring the heat resistance of the protective tape 40, PI (polyimide) is preferred.

[0045] The adhesive portion is used to adhere the protective tape 40 to the inner surface of the outer packaging can 20. The thickness of the adhesive portion is, for example, 1 μm or more and 30 μm or less, preferably 2 μm or more and 25 μm or less. The adhesive portion comprises, for example, at least one of a rubber-based polymer, an acrylic polymer, and a silicone polymer. Because rubber-based polymers, acrylic polymers, and silicone polymers have adhesive properties, the protective tape 40 can be adhered to the inner surface of the outer packaging can 20.

[0046] The following describes an example of a method for manufacturing a non-aqueous electrolyte secondary battery equipped with protective tape 40. First, protective tape 40 is adhered to the inner surface of the opening 24 of the outer packaging can 20. Preferably, protective tape 40 is adhered to the entire circumference of the opening 24. Then, with insulating plates 16 and 17 positioned above and below the electrode body 14, the electrode body 14 is housed within the outer packaging can 20. The negative electrode lead 19 is soldered to the bottom 21 of the outer packaging can 20, and a slot 23 is formed on the side 22 of the outer packaging can 20 by stamping. Next, an appropriate amount of non-aqueous electrolyte is injected into the interior of the outer packaging can 20, and a gasket 34 is housed in the upper part of the slot 23. Subsequently, a sealing body 30 is soldered to the positive electrode lead 18, and the sealing body 30 is clamped and secured between the slot 23 and the opening 24, with the gasket 34 in between. This process produces a non-aqueous electrolyte secondary battery 10 equipped with protective tape 40.

[0047] As described above, by placing a protective tape 40 with an exposed portion 41 between the opening 24 of the outer packaging can 20 and the gasket 34 as a protective member, the movement of non-aqueous electrolyte leaking to the outside of the battery toward the sealing portion 26 is suppressed. As a result, rusting of the outer packaging can 20 caused by the sealing portion 26 contacting the non-aqueous electrolyte can be suppressed.

[0048] Furthermore, by providing a protective member between the opening 24 of the outer packaging can 20 and the gasket 34, the airtightness of the battery interior can be easily improved. In addition, by providing a protective member between the opening 24 of the outer packaging can 20 and the gasket 34, thermal damage to the gasket 34 and the sealing body 30 can be reduced, for example, during the battery manufacturing process when welding the clamping part 26.

[0049] It should be noted that the above embodiments can be appropriately modified without affecting the purpose of the present invention. For example, in the above embodiments, the protective member is an adhesive tape that fits onto the opening 24; however, the composition of the protective member is not limited to this. For example, the protective member may also be a non-adhesive sheet-like member.

[0050] Furthermore, in the above embodiment, the protective tape 40 is disposed between the opening 24 of the pad 34 and the upper surface 34B and side surface 34C of the pad 34; however, the placement of the protective tape 40 is not limited to this. For example, the protective tape 40 may be disposed only between the opening 24 and the upper surface 34B of the pad 34, and not between the opening 24 and the side surface 34C of the pad 34.

[0051] Furthermore, in the above embodiment, the exposed portion 41 extends along the upper surface 34B of the pad 34, but is not limited to this. For example, it may also be as follows: Figure 4As shown, the exposed portion 41 extends upward and is configured to cover the radially inner end 26A of the clamping portion 26. In this case, it is possible to prevent the leaked non-aqueous electrolyte from contacting the radially inner end 26A of the clamping portion 26.

[0052] Furthermore, between the opening 24 and the gasket 34 of the outer packaging can 20, a sealant can be provided to enhance the airtightness of the outer packaging can 20, in addition to the protective member. Materials traditionally used as sealants can be used as the sealant material, such as rubber-based polymers, tar pitch, petroleum asphalt, vinyl-based, silicone-based, acrylic-based, polyurethane-based, and fluorine-based polymers. The sealant can be made, for example, by applying a coating liquid containing the aforementioned materials to the surface of the protective tape 40 adhered to the inner surface of the outer packaging can 20. That is, the sealant is sandwiched between the protective tape 40 and the gasket 34.

[0053] The present invention can be further illustrated by the following embodiments.

[0054] Component 1:

[0055] A non-aqueous electrolyte secondary battery comprises: an electrode body having a positive electrode and a negative electrode, a non-aqueous electrolyte, a bottomed cylindrical outer packaging can containing the electrode body and the non-aqueous electrolyte, a sealing body sealing the opening of the outer packaging can, an annular gasket disposed between the outer packaging can and the sealing body, and a protective member disposed between the outer packaging can and the gasket. The outer packaging can has a clamping portion extending radially inward and clamping the sealing body, and the protective member has an exposed portion disposed radially inward relative to the radially inner end of the clamping portion.

[0056] Composition 2:

[0057] According to the non-aqueous electrolyte secondary battery described in configuration 1, the radial inner end of the exposed portion is disposed radially inner compared to the radial inner end of the pad.

[0058] Composition 3:

[0059] According to configuration 1 or 2, the radial length of the exposed portion is 0.10 mm or more.

[0060] Composition 4:

[0061] According to any one of the non-aqueous electrolyte secondary batteries described in configurations 1 to 3, the exposed portion is provided along the entire circumference of the outer packaging can.

[0062] Component 5:

[0063] According to any one of the non-aqueous electrolyte secondary batteries described in configurations 1 to 4, the aforementioned protective component is an adhesive tape that is attached to the inner surface of the aforementioned outer packaging can.

[0064] Composition 6:

[0065] According to any one of the non-aqueous electrolyte secondary batteries described in configurations 1 to 5, the aforementioned protective component is insulating.

[0066] Explanation of reference numerals in the attached figures

[0067] 10 Non-aqueous electrolyte secondary battery, 11 Positive electrode, 12 Negative electrode, 13 Spacer, 14 Electrode body, 16, 17 Insulating plate, 18 Positive electrode lead, 19 Negative electrode lead, 20 Outer packaging can, 21 Bottom, 22 Side part, 23 Slotted part, 24 Opening part, 25 Opening side part, 26 Grateped part, 26A Radial inner end, 30 Sealing body, 31 Internal terminal plate, 31A Thick wall part, 31B Central part, 31C Vent hole, 32 Insulating component, 32A Opening part, 32B Vent hole, 33 External terminal plate, 33A Thin wall part, 34 Gasket, 34A Radial inner end, 34B Top surface, 34C Side, 40 Protective tape, 41 Exposed part, 41A Radial inner end.

Claims

1. A non-aqueous electrolyte secondary battery, comprising: Electrode bodies with positive and negative electrodes Non-aqueous electrolyte, A bottomed cylindrical outer packaging container that houses the electrode body and the non-aqueous electrolyte. The sealing body that blocks the opening of the outer packaging can. An annular gasket disposed between the outer packaging can and the sealing body, and A protective component disposed between the outer packaging can and the gasket. The outer packaging can has a clamping portion that extends radially inward and clamps the sealing body in place. The protective member has an exposed portion that is arranged radially inward relative to the radially inner end of the chisel portion.

2. The non-aqueous electrolyte secondary battery according to claim 1, wherein, The radial inner end of the exposed portion is positioned radially inner compared to the radial inner end of the pad.

3. The non-aqueous electrolyte secondary battery according to claim 1, wherein, The radial length of the exposed portion is 0.10 mm or more.

4. The non-aqueous electrolyte secondary battery according to claim 1, wherein, The exposed portion is located along the entire circumference of the outer packaging can.

5. The non-aqueous electrolyte secondary battery according to claim 1, wherein, The protective component is adhesive tape, which is attached to the inner surface of the outer packaging can.

6. The non-aqueous electrolyte secondary battery according to claim 1, wherein, The protective component is insulating.

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