WO2022158378A1 - 円筒形電池 - Google Patents
円筒形電池 Download PDFInfo
- Publication number
- WO2022158378A1 WO2022158378A1 PCT/JP2022/001036 JP2022001036W WO2022158378A1 WO 2022158378 A1 WO2022158378 A1 WO 2022158378A1 JP 2022001036 W JP2022001036 W JP 2022001036W WO 2022158378 A1 WO2022158378 A1 WO 2022158378A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing plate
- cylindrical battery
- thin
- adjacent
- axial direction
- Prior art date
Links
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- 238000007789 sealing Methods 0.000 claims description 116
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present disclosure relates to cylindrical batteries.
- Patent Document 1 there is one described in Patent Document 1 as a cylindrical battery.
- This cylindrical battery includes a sealing body having a sealing plate, a metal plate as an internal terminal plate, and an insulating member interposed between the sealing plate and the metal plate.
- the inside is sealed by crimping and fixing a sealing member to the opening of a bottomed cylindrical outer can via a resin gasket.
- the sealing plate of this cylindrical battery is provided with an inclined portion whose thickness continuously decreases while being displaced outward in the axial direction in the radial direction from the inner peripheral portion to the outer peripheral portion.
- the safety mechanism is activated when the internal pressure rises due to abnormal heat generation. Specifically, in this cylindrical battery, when the internal pressure rises due to abnormal heat generation, the inclined portion reverses and the current path inside the battery is cut off. Further, when the internal pressure further increases, the inclined portion breaks and the gas inside the battery is discharged to the outside.
- the sealing plate is arranged on the outermost part of the sealing body and functions as an external terminal.
- External leads are electrically connected to the external terminals when a module is composed of a plurality of cylindrical batteries.
- the inner periphery of the upper surface of the sealing plate of the cylindrical battery is recessed toward the inside of the battery compared to the shoulder of the bottomed outer can, and it is sometimes difficult to electrically connect the external terminal to the external lead. be.
- the sealing member may be turned over or broken.
- the sealing plate is provided with a convex portion, it is preferable to reduce variations in the reversal pressure and the vent pressure.
- an object of the present disclosure is to provide a cylindrical battery that can reduce variations in the inversion pressure of the sealing member and the vent pressure.
- a cylindrical battery according to the present disclosure is a cylindrical battery that includes a bottomed cylindrical outer can and a sealing body that closes the opening of the outer can, wherein the sealing body is broken.
- the sealing plate has an outer peripheral portion, at least a portion of which is crimped and fixed to the opening of the outer can, and an annular thin portion adjacent to the outer peripheral portion.
- the thin-walled portion has an inclined portion that inclines toward the bottom side of the outer can in the axial direction as it goes radially inward, and the thin-walled portion is cut along a plane that includes the radial direction and the axial direction.
- the inner surface of the adjacent portion of the thin portion adjacent to the outer peripheral portion has a curved shape, and the gradient of the outer surface of the thin portion changes toward the outer peripheral portion so that the thickness of the adjacent portion decreases.
- the outer surface may have a polygonal line shape formed by connecting two or more straight lines with different gradients in the cross section, or may include curved lines.
- the gradient of the outer surface at the connection point of the polygonal line is the gradient of the straight line located radially inward of the two straight lines. shall be defined as identical gradients.
- the slope of the outer surface at the point of the curve shall be defined as the slope of the tangent to the curve.
- the cylindrical battery according to the present disclosure it is possible to reduce variations in the reversal pressure of the sealing body and the vent pressure.
- FIG. 1 is an axial cross-sectional view of a cylindrical battery according to an embodiment of the present disclosure
- FIG. 3 is a perspective view of an electrode body of the cylindrical battery
- FIG. 4 is an enlarged cross-sectional view of the periphery of the sealing member of the cylindrical battery
- FIG. FIG. 2 is a cross-sectional view corresponding to FIG. 1 in a cylindrical battery of a modified example
- It is an axial cross-sectional view of the sealing plate, and is a cross-sectional view when the sealing plate is cut along a plane including the axial direction and the radial direction.
- 5B is an enlarged view of the R1 region of FIG. 5A
- FIG. FIG. 4B is a cross-sectional view corresponding to FIG.
- FIG. 6B is an enlarged view of the R2 region of FIG. 6A. It is a schematic diagram for demonstrating the outline
- the cylindrical battery of the present disclosure may be a primary battery or a secondary battery.
- a battery using an aqueous electrolyte or a battery using a non-aqueous electrolyte may be used.
- a non-aqueous electrolyte secondary battery (lithium ion battery) using a non-aqueous electrolyte is exemplified below as the cylindrical battery 10 of one embodiment, but the cylindrical battery of the present disclosure is not limited to this.
- FIG. 1 is an axial cross-sectional view of a cylindrical battery 10 according to an embodiment of the present disclosure
- FIG. 2 is a perspective view of an electrode body 14 of the cylindrical battery 10.
- a cylindrical battery 10 includes a wound electrode body 14, a non-aqueous electrolyte (not shown), and a battery case 15 that accommodates the electrode body 14 and the non-aqueous electrolyte.
- the electrode body 14 includes a positive electrode 11, a negative electrode 12, and a separator 13 interposed between the positive electrode 11 and the negative electrode 12.
- the positive electrode 11 and the negative electrode 12 are wound with the separator 13 interposed therebetween. It has a winding structure.
- the battery case 15 is composed of a bottomed cylindrical outer can 16 and a sealing member 17 that closes the opening of the outer can 16 .
- Cylindrical battery 10 also includes a resin gasket 28 arranged between outer can 16 and sealing member 17 .
- the non-aqueous electrolyte contains a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
- Esters, ethers, nitriles, amides, and mixed solvents of two or more thereof may be used as the non-aqueous solvent.
- the non-aqueous solvent may contain halogen-substituted products in which at least part of the hydrogen atoms of these solvents are substituted with halogen atoms such as fluorine.
- the non-aqueous electrolyte is not limited to a liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
- a lithium salt such as LiPF 6 is used as the electrolyte salt.
- the electrode body 14 has an elongated positive electrode 11 , an elongated negative electrode 12 , and two elongated separators 13 . Further, the electrode body 14 has a positive electrode lead 20 joined to the positive electrode 11 and a negative electrode lead 21 joined to the negative electrode 12 .
- the negative electrode 12 is formed to be one size larger than the positive electrode 11 and longer than the positive electrode 11 in the longitudinal direction and the width direction (transverse direction) in order to suppress deposition of lithium.
- the two separators 13 are at least one size larger than the positive electrode 11, and are arranged so as to sandwich the positive electrode 11, for example.
- the positive electrode 11 has a positive electrode current collector and positive electrode mixture layers formed on both sides of the current collector.
- a foil of a metal such as aluminum or an aluminum alloy that is stable in the potential range of the positive electrode 11, a film having the metal on the surface layer, or the like can be used.
- the positive electrode mixture layer contains a positive electrode active material, a conductive agent, and a binder.
- a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, a binder, and the like is applied onto a positive electrode current collector, the coating film is dried, and then compressed to collect a positive electrode mixture layer. It can be produced by forming on both sides of the electric body.
- the positive electrode active material is composed mainly of a lithium-containing metal composite oxide.
- Metal elements contained in the lithium-containing metal composite oxide include Ni, Co, Mn, Al, B, Mg, Ti, V, Cr, Fe, Cu, Zn, Ga, Sr, Zr, Nb, In, Sn , Ta, W, and the like.
- An example of a preferable lithium-containing metal composite oxide is a composite oxide containing at least one of Ni, Co, Mn and Al.
- Carbon materials such as carbon black, acetylene black, ketjen black, and graphite can be exemplified as the conductive agent contained in the positive electrode mixture layer.
- the binder contained in the positive electrode mixture layer include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide resins, acrylic resins, and polyolefin resins. . These resins may be used in combination with cellulose derivatives such as carboxymethyl cellulose (CMC) or salts thereof, polyethylene oxide (PEO), and the like.
- CMC carboxymethyl cellulose
- PEO polyethylene oxide
- the negative electrode 12 has a negative electrode current collector and negative electrode mixture layers formed on both sides of the current collector.
- a foil of a metal such as copper or a copper alloy that is stable in the potential range of the negative electrode 12, a film having the metal on the surface layer, or the like can be used.
- the negative electrode mixture layer contains a negative electrode active material and a binder.
- a negative electrode mixture slurry containing a negative electrode active material, a binder, and the like is applied onto a negative electrode current collector, the coating film is dried, and then compressed to form a negative electrode mixture layer on the current collector. It can be produced by forming on both sides.
- a carbon material that reversibly absorbs and releases lithium ions is generally used as the negative electrode active material.
- Preferred carbon materials are graphite such as natural graphite such as flake graphite, massive graphite and earthy graphite, massive artificial graphite and artificial graphite such as graphitized mesophase carbon microbeads.
- the negative electrode mixture layer may contain a Si material containing silicon (Si) as a negative electrode active material.
- a metal other than Si that forms an alloy with lithium, an alloy containing the metal, a compound containing the metal, or the like may be used as the negative electrode active material.
- the binder contained in the negative electrode mixture layer may be fluororesin, PAN, polyimide resin, acrylic resin, polyolefin resin, or the like, but preferably styrene-butadiene rubber (SBR ) or its modified form.
- the negative electrode mixture layer may contain, for example, CMC or its salt, polyacrylic acid (PAA) or its salt, polyvinyl alcohol, etc. in addition to SBR or the like.
- a porous sheet having ion permeability and insulation is used for the separator 13 .
- porous sheets include microporous thin films, woven fabrics, and non-woven fabrics.
- polyolefin resins such as polyethylene and polypropylene, cellulose, and the like are preferable.
- the separator 13 may have either a single layer structure or a laminated structure.
- a heat-resistant layer or the like may be formed on the surface of the separator 13 .
- the negative electrode 12 may constitute the winding start end of the electrode body 14, but in general, the separator 13 extends beyond the winding start side end of the negative electrode 12, and the winding start side end of the separator 13 is the electrode body. 14 winding start end.
- the positive lead 20 is electrically connected to an intermediate portion such as the center of the winding direction of the positive electrode core, and the negative lead 21 is connected to the winding direction of the negative electrode core. It is electrically connected to the terminating end.
- the negative electrode lead may be electrically connected to the winding start end of the negative electrode core in the winding direction.
- the electrode body has two negative leads, one negative lead is electrically connected to the winding start end of the negative electrode core in the winding direction, and the other negative lead is connected to the winding of the negative electrode core. It may be electrically connected to the winding end portion in the winding direction.
- the negative electrode and the outer can may be electrically connected by bringing the winding end portion of the negative electrode core in the winding direction into contact with the inner surface of the outer can.
- the cylindrical battery 10 further has an insulating plate 18 arranged above the electrode assembly 14 and an insulating plate 19 arranged below the electrode assembly 14 .
- the positive electrode lead 20 attached to the positive electrode 11 extends through the through hole of the insulating plate 18 toward the sealing member 17
- the negative electrode lead 21 attached to the negative electrode 12 extends outside the insulating plate 19 . and extends to the bottom 68 side of the outer can 16 .
- the positive lead 20 is connected to the lower surface of the terminal plate 23, which is the bottom plate of the sealing member 17, by welding or the like
- the sealing plate 27, which is the top plate of the sealing member 17 electrically connected to the terminal plate 23, serves as a positive electrode terminal.
- the negative electrode lead 21 is connected to the inner surface of the bottom 68 of the outer can 16 by welding or the like, and the outer can 16 becomes a negative terminal.
- the outer can 16 is a metal container having a bottomed cylindrical portion.
- the inner space of the battery case 15 is hermetically sealed by sealing the space between the outer can 16 and the sealing member 17 with an annular gasket 28 .
- the gasket 28 also includes a clamping portion 32 clamped between the outer can 16 and the sealing member 17 to insulate the sealing member 17 from the outer can 16 .
- the gasket 28 serves as a sealing material for keeping the inside of the battery airtight, and as an insulating material for preventing a short circuit between the outer can 16 and the sealing body 17 .
- the outer can 16 has an annular grooved portion 35 in a portion of the cylindrical outer peripheral surface in the height direction.
- the grooved portion 35 can be formed, for example, by spinning a portion of the outer peripheral surface of the cylinder radially inward to recess it radially inward.
- the outer can 16 has a bottomed tubular portion 30 including a grooved portion 35 and an annular shoulder portion 33 .
- the bottomed cylindrical portion 30 accommodates the electrode body 14 and the non-aqueous electrolyte, and the shoulder portion 33 is bent radially inward from the opening side end of the bottomed cylindrical portion 30 to extend into the inner side. extending in all directions.
- the shoulder portion 33 is formed when the upper end portion of the outer can 16 is folded inward and crimped to the peripheral edge portion 31 of the sealing member 17 .
- the sealing member 17 is clamped between the shoulder portion 33 and the grooved portion 35 via the gasket 28 and fixed to the outer can 16 by crimping.
- FIG. 3 is an enlarged cross-sectional view of the periphery of the sealing member of the cylindrical battery 10.
- the sealing member 17 has a structure in which a terminal plate 23, an annular insulating plate 25, and a sealing plate 27 are laminated in this order from the electrode body 14 side.
- Each member constituting the sealing member 17 has a disk shape or a ring shape, and each member except for the insulating plate 25 is electrically connected.
- the terminal plate 23 constitutes the bottom plate of the sealing member 17 and has a circular upper surface 23a positioned substantially on the same plane.
- the terminal plate 23 has an annular thick portion 23b positioned radially outward and a disc-shaped portion connected to the radially inner annular end portion of the thick portion 23b and thinner than the thick portion 23b. It has a thin portion 23c.
- the positive electrode lead 20 is connected to the lower surface of the thick portion 23b of the terminal plate 23 by welding or the like.
- the sealing body 17 may be composed only of the sealing plate 27 . In that case, the positive electrode lead 20 is connected to the sealing plate 27 as shown in FIG.
- the sealing plate 27 has a circular shape in plan view.
- the sealing plate 27 can be produced, for example, by pressing a plate material of aluminum or an aluminum alloy. Since aluminum and aluminum alloys are excellent in flexibility, they are preferable as a material for the sealing plate 27 functioning as an explosion-proof valve.
- the sealing plate 27 has a central portion 27a located in the center in the radial direction, an annular outer peripheral portion 27b located on the outer side in the radial direction, and a thin portion 27c connecting the central portion 27a and the outer peripheral portion 27b.
- the central portion of the lower surface of the central portion 27a has a substantially circular shape in a plan view and widens in a direction substantially orthogonal to the height direction.
- the upper surface of the thin portion 23c of the terminal plate 23 and the central portion of the lower surface of the central portion 27a of the sealing plate 27 are joined by metallurgical joining such as laser welding. If the terminal plate 23 is made of aluminum or an aluminum alloy like the sealing plate 27, the sealing plate 27 and the terminal plate 23 can be easily joined.
- the central portion 27a has a convex portion 55 that is connected to the radially inner end portion of the thin portion 27c and protrudes axially outward (in the height direction) from the end portion.
- a top surface 55 a of the convex portion 55 is positioned axially outward of a portion 33 a of the shoulder portion 33 that is positioned furthest outward in the axial direction.
- the outer peripheral portion 27 b of the sealing plate 27 is sandwiched between the shoulder portion 33 and the grooved portion 35 with the gasket 28 interposed therebetween. Thereby, the sealing plate 27 is fixed to the opening of the outer can 16 .
- the axial thickness of the thin portion 27c is thinner than the axial thickness of the outer peripheral portion 27b, and is thinner than the axial thickness of the central portion 27a.
- the thin portion 27c has an inclined portion 56 which is inclined downward in the axial direction as it goes radially inward.
- the axial thickness of the annular adjacent portion 59 adjacent to the outer peripheral portion 27b is thinner than the axial thickness of other portions of the thin portion 27c.
- the shape of the thin portion 27c will be described later in detail with reference to FIGS. 5A and 5B.
- the sealing plate 27 has a protruding portion 57 protruding downward at the lower end in the axial direction.
- the insulating plate 25 is fitted and fixed to the outer peripheral surface 29 of the projecting portion 57 by press fitting.
- the insulating plate 25 has an annular projecting portion 25a bent downward in the height direction on the radially outward side. It is fitted and fixed.
- the insulating plate 25 is provided to ensure insulation and prevents the thick portion 23 b of the terminal plate 23 from being electrically connected to the sealing plate 27 .
- the insulating plate 25 is preferably made of a material that does not affect battery characteristics. Examples of the material of the insulating plate 25 include polymer resins such as polypropylene (PP) resin and polybutylene terephthalate (PBT) resin.
- the outer peripheral surface of the insulating plate 25 contacts the inner peripheral surface of the outer peripheral portion 27 b of the sealing plate 27 located axially below. A portion of the lower surface of the sealing plate 27 including the lower surface of the thin portion 27c and the upper surface of the insulating plate 25 define an annular space 58 together.
- the insulating plate 25 has one or more air holes 25b passing through in the axial direction and communicating with the space 58, and the terminal plate 23 has one or more air holes 23d passing through in the axial direction and communicating with the air holes 25b. have.
- the sealing member 17 performs current interruption operation and gas release operation as follows. Specifically, when the internal pressure of the cylindrical battery 10 reaches a predetermined value, the central portion 27a and the thin portion 27c of the sealing plate 27 are pivoted around the annular adjacent portion 59, which is thin and has low rigidity, as a fulcrum. Flip direction up. Simultaneously with the reversal, the thin portion 23c of the terminal plate 23 breaks and the portion connected to the sealing plate 27 is separated from the terminal plate 23, or the welded portion between the terminal plate 23 and the sealing plate 27 comes off.
- This operation cuts off the current path between the terminal plate 23 and the sealing plate 27 . Further, when the internal pressure rises, the adjacent portion 59 of the thin portion 27c is broken, and the gas inside the battery is discharged to the outside from the broken portion of the sealing plate 27 via the vent holes 23d and 25b. As a result, even if the internal pressure of the cylindrical battery 10 rises, the battery can be prevented from exploding, and the effects on equipment in which the cylindrical battery 10 is mounted can be suppressed, thereby improving safety.
- the thin-walled portion 27c of the sealing plate serves as a breaking portion that discharges internal gas to the outside by breaking.
- FIG. 5A is an axial cross-sectional view of the sealing plate 27, and is a cross-sectional view when the sealing plate 27 is cut along a plane including the axial direction and the radial direction.
- FIG. 5B is an enlarged view of the R1 area in FIG. 5A and shows the portion of the sealing plate 27 on the radially outer side.
- the thin portion 27c has an annular adjacent portion 59 adjacent to the outer peripheral portion 27b, and the inner surface of the adjacent portion 59 has a curved shape. That is, the inner surface of the adjacent portion 59 is an annular curved surface 59a.
- the gradient of the outer surface 70 of the thin portion 27c changes toward the outer peripheral portion 27b so that the thickness of the adjacent portion 59 in the axial direction becomes smaller.
- the outer surface 70 of the thin portion 27c is composed of a conical inner peripheral surface 70a that displaces axially outward as it goes radially outward, and a diameter of the conical inner peripheral surface 70a. It includes an annular flat surface 70b that extends in a direction that is substantially perpendicular to the axial direction and that is connected to the end on the direction outer side.
- the conical inner peripheral surface 70 a is located radially inward of the adjacent portion 59 .
- a facing surface 70c axially facing the curved surface 59a on the outer surface 70 is included in the flat surface 70b.
- the facing surface 70 c corresponds to the outer surface of the adjacent portion 59 .
- the outer surface 70 has a polygonal line shape, and the first linear portion 60a displaced axially outward as it goes radially outward.
- a second linear portion 60b extending in a direction substantially perpendicular to the axial direction from an outer end 71 on the radially outward side of the .
- the outer end 71 is positioned radially inward of the adjacent portion 59 .
- the gradient of the outer surface 70 of the thin portion 27c changes so that the axial thickness of the adjacent portion 59 becomes smaller across an outer end 71, which is a gradient changing point.
- the outer surface 70 of the thin portion 27c is inclined toward the inner surface 80 of the thin portion 27c when moving from the radially inner side to the outer side.
- the inner surface 80 of the thin portion 27c includes the curved surface 59a and an annular inclined surface 81 connected to the radially inner end of the curved surface 59a.
- the inclined surface 81 is a conical outer peripheral surface that displaces downward in the axial direction as it goes radially inward.
- the lower surface of the central portion 27 a has a conical outer peripheral surface portion 82 connected to the inclined surface 81 radially outward and located on the same conical outer peripheral surface as the inclined surface 81 .
- the conical inner peripheral surface 70a is substantially parallel to the inclined surface 81, and the axial thickness of the inclined portion 56 is substantially constant regardless of the radial position. It has become.
- the axial thickness of the inclined portion positioned radially inward of the thin portion may gradually increase toward the radially inward side.
- sealing plate 27 As a sealing member of the embodiment, the sealing plate 27 described in detail with reference to FIGS. 5A and 5B, that is, as shown in FIG. A sealing plate that changes so as to become smaller toward the outer peripheral portion 27b is used.
- FIGS. 6A and 6B A sealing plate 127 shown in FIGS. 6A and 6B was used as a sealing member of a comparative example.
- FIG. 6A is a cross-sectional view corresponding to FIG. 6A of a sealing plate 127 of a comparative example
- FIG. 6B is an enlarged view of the R2 region of FIG. is shown.
- the outer surface 170 of the thin portion 127c of the sealing plate 127 is displaced axially outward (upper in the height direction) as it goes radially outward, and the gradient of the outer surface 170 is constant. is different from the sealing plate 27 of the embodiment.
- the sealing plate 127 has a gradient change point 171 where the gradient changes with respect to a portion where the gradient is constant on the outer surface 170 on the outer peripheral portion 127b, and the gradient change point 171 is adjacent to the outer peripheral portion 127b at the thin portion 127c. It differs from the sealing plate 27 of the embodiment in that it is positioned radially outward of the adjoining portion 159 .
- the sealing plate 127 is substantially the same as corresponding configurations of the sealing plate 27 .
- the central portion 127a has a convex portion 155 projecting axially outward (axially upward) from the radially inner end of the thin portion 127c, and the inner surface of the adjacent portion 159 has a curved shape.
- the inner surface of the adjacent portion 159 is a curved surface 159a.
- the inner surface 180 of the thin portion 127c has an inclined surface 181 connected to the radially inner end of the curved surface 159a and displaced axially downward as it goes axially inward. Identical to plate 27 .
- a measuring device is connected to the receiving portion 52 , and airtightness of the space S surrounded by the sealing plate 27 and the receiving portion 52 is ensured by applying pressure from above to the pressing portion 51 with an air cylinder (not shown). Gas was supplied at a constant rate from a gas cylinder 54 filled with gas into the space S through a regulator 53 . Then, the reversal and breakage of the sealing plate 27 were visually confirmed, and the air pressure in the space S when the reversal and breakage were confirmed was defined as the reversal pressure and the vent pressure, respectively. Measurements of inversion pressure and vent pressure were performed using 20 samples for each of the examples and comparative examples.
- Table 1 shows the test results.
- the cylindrical battery 10 of the present disclosure includes the bottomed cylindrical outer can 16 and the sealing member 17 that closes the opening of the outer can 16, and the sealing member 17 is broken to release the internal gas to the outside. It includes a sealing plate 27 for ejection.
- the sealing plate 27 has an outer peripheral portion 27b, at least a portion of which is crimped and fixed to the opening of the outer can 16, and an annular thin portion 27c adjacent to the outer peripheral portion 27b. It has a sloped portion 56 that slopes toward the bottom side of the outer can 16 in the axial direction as it goes inward.
- the inner surface of the adjacent portion 59 adjacent to the outer peripheral portion 27b is a curved surface 59a.
- the gradient of the outer surface 70 of the thin portion 27c in the cross section obtained by cutting the thin portion 27c along a plane including the radial direction and the axial direction changes toward the outer peripheral portion 27b so that the thickness of the adjacent portion 59 becomes smaller.
- the plane on which the facing surface 70c of the adjacent portion 59 spreads can be made closer to a plane perpendicular to the axial direction, and the force received by the adjacent portion 59, which is the breaking portion, from the internal gas can be made closer to the force parallel to the axial direction. can be done.
- the cylindrical battery 10 abnormally heats up, it is possible to reduce variations in the force that the adjacent portion 59 receives from the gas in the battery, and to reduce variations in the reverse pressure and the vent pressure.
- the outer surface 70 may widen in a direction substantially orthogonal to the axial direction at the adjacent portion 59 .
- the facing surface 70c axially facing the curved surface 59a on the outer surface 70 may extend in a direction substantially orthogonal to the axial direction, or may be substantially parallel to a plane orthogonal to the axial direction.
- the force that the adjacent portion 59 receives from the internal gas can be made substantially parallel to the axial direction. Therefore, when the cylindrical battery 10 abnormally heats up, it is possible to more easily suppress variations in the force that the adjacent portion 59 receives from the gas in the battery, and to further reduce variations in the reverse pressure and the vent pressure.
- sealing plate 27 may have a protrusion 55 projecting outward in the axial direction at the center in the radial direction.
- the sealing plate has a battery outside in the center in the radial direction.
- the projection makes it difficult for the sealing member to be reversed or broken, and there is a risk that the reversal pressure and the vent pressure will vary greatly.
- the inversion pressure and the vent pressure are less likely to vary. Even if the electrical connection of the external leads is facilitated, the sealing plate 27 can easily be reversed or broken at a desired operating pressure. Therefore, it is possible to realize a cylindrical battery 10 that not only facilitates the electrical connection between the external terminals and the external leads, but also reduces variations in reverse pressure and vent pressure.
- top surface 55a of the convex portion 55 may be positioned axially outward of the shoulder portion 33 of the outer can 16.
- the outer can 16 when the top surface 55a of the convex portion 55 constituting the external terminal is electrically connected to the external lead, the outer can 16 is unlikely to be an obstacle, and the top surface 55a of the convex portion 55 is connected to the external lead. Furthermore, it can connect smoothly.
- the facing surface 70c of the adjacent portion 59 extends substantially parallel to the plane perpendicular to the axial direction.
- the facing surface which is the outer surface of the adjacent portion, does not have to extend substantially parallel to the plane perpendicular to the axial direction. It may be an inclined surface that inclines outward in the direction.
- the sealing plate 27 has a projection 55 projecting axially outward at the radial center portion, and the top surface 55 a of the projection 55 extends axially outward from the shoulder portion 33 of the outer can 16 .
- the top surface of the protrusion that protrudes axially outward at the radial center of the sealing plate is positioned closer to the electrode body in the axial direction than the outermost position in the axial direction of the shoulder of the outer can. You may Alternatively, the sealing plate may not have a convex portion that protrudes axially outward.
- the outer surface 70 of the thin portion 27c in the cross section obtained by cutting the thin portion 27c along a plane including the radial direction and the axial direction has a polygonal line shape in which the gradient changes only at one point (the outer end 71) will be described.
- the shape of the outer surface of the thin-walled portion in the cross section when the thin-walled portion is cut along a plane including the radial direction and the axial direction may be any shape as long as the gradient of the outer surface changes so that the thickness of the adjacent portion becomes smaller. good.
- the outer surface of the thin portion in a cross section may have a polygonal line shape in which the gradient changes at a plurality of points, and the outer surface is radially outward.
- a configuration may be adopted in which the gradient of the outer surface gradually inclines toward the inner surface of the thin-walled portion in a plurality of steps when moving toward the inner surface.
- the outer surface of the thin-walled portion in a cross section obtained by cutting the thin-walled portion along a plane including the radial direction and the axial direction may include a curve, and the gradient of the tangent line of the curve gradually decreases toward the adjacent portion of the thin-walled portion. You may have the shape which inclines to the inner surface side of a thin part.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
実施例の封口体として、図5A及び図5Bを用いて詳細に説明した封口板27、すなわち、図5Bに示すように、薄肉部27cの外面70の勾配が隣接部59の軸方向厚さが外周部27bに向かって小さくなるように変化している封口板を用いた。
比較例の封口体として、図6A及び図6Bに示す封口板127を用いた。図6Aは、比較例の封口板127における図6Aに対応する断面図であり、図6Bは、図6AのR2領域の拡大図であり、比較例の封口板127における径方向外方側の部分を示している。封口板127は、図6Bに示すように、薄肉部127cの外面170が、径方向外方側に行くにしたがって軸方向外方側(高さ方向上側)に変位し、外面170の勾配が一定になっている点が、実施例の封口板27と異なる。また、封口板127は、外面170における勾配が一定の箇所に対して勾配が変化する勾配変化点171が外周部127bに存在して、勾配変化点171が薄肉部127cにおいて外周部127bに隣接する隣接部159よりも径方向外方側に位置する点が、実施例の封口板27と異なる。
各封口板27,127において反転圧とベント圧の測定を同一の装置を用いて次のように行った。以下では、封口板27の反転圧とベント圧の測定方法について説明し、封口板127の反転圧とベント圧の測定方法については説明を省略する。図7に示すように、押さえ部51と受け部52を有する固定治具50に封口板27を固定した。押さえ部51と受け部52は、透明の材質、例えば、アクリルや強化ガラス等で構成した。受け部52には、測定装置が接続されており、押さえ部51を図示しないエアーシリンダーで上方から加圧することで封口板27と受け部52で囲まれる空間Sの気密性を確保した。この空間Sに気体を充填したガスボンベ54からレギュレーター53を経由して気体を一定速度で供給した。そして、封口板27の反転や破断を目視により確認し、反転及び破断を確認した時の空間Sの気圧をそれぞれ反転圧及びベント圧とした。反転圧とベント圧の測定は、実施例及び比較例の夫々で20のサンプルを用いて実行した。
以上、本開示の円筒形電池10は、有底筒状の外装缶16と、外装缶16の開口を塞ぐ封口体17とを備え、封口体17が、破断することで内部のガスを外部に排出する封口板27を含む。また、封口板27が、少なくとも一部が外装缶16の開口部にかしめ固定される外周部27bと、外周部27bに隣接する環状の薄肉部27cとを有し、薄肉部27cが、径方向の内方側に行くにしたがって軸方向の外装缶16の底側に傾斜する傾斜部56を有する。また、薄肉部27cにおいて外周部27bに隣接する隣接部59の内面が湾曲面59aになっている。そして、薄肉部27cを径方向と軸方向を含む平面で切断したときの断面における薄肉部27cの外面70の勾配が、隣接部59の厚みが小さくなるように外周部27bに向かって変化している。
また、外面70が隣接部59において軸方向に略直交する方向に広がっていてもよい。換言すると、外面70において湾曲面59aに軸方向に対向する対向面70cが、軸方向に略直交する方向に広がっていてもよく、軸方向に直交する平面に略平行になっていてもよい。
Claims (4)
- 有底筒状の外装缶と、前記外装缶の開口を塞ぐ封口体とを備えた円筒形電池であって、
前記封口体が、破断することで内部のガスを外部に排出する封口板を含み、
前記封口板は、少なくとも一部が前記外装缶の開口部にかしめ固定される外周部と、前記外周部に隣接する環状の薄肉部とを有し、
前記薄肉部が、径方向の内方側に行くにしたがって軸方向の前記外装缶の底側に傾斜する傾斜部を有し、
前記薄肉部を前記径方向と前記軸方向を含む平面で切断したときの断面において、前記薄肉部のうち前記外周部に隣接する隣接部の内面が湾曲形状を有するとともに、前記薄肉部の外面の勾配が、前記隣接部の厚みが小さくなるように前記外周部に向かって変化している、
円筒形電池。 - 前記外面が前記隣接部において前記軸方向に略直交する方向に広がっている、請求項1に記載の円筒形電池。
- 前記封口板が、前記径方向の中心部に前記軸方向の外方側に突出する凸部を有する、請求項1又は2に記載の円筒形電池。
- 前記凸部の天面が、前記外装缶の肩部よりも前記軸方向の外方側に位置する、請求項3に記載の円筒形電池。
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CN202280010038.XA CN116711144A (zh) | 2021-01-21 | 2022-01-14 | 圆筒形电池 |
JP2022576640A JPWO2022158378A1 (ja) | 2021-01-21 | 2022-01-14 | |
EP22742500.6A EP4283772A1 (en) | 2021-01-21 | 2022-01-14 | Cylindrical battery |
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JP2016177877A (ja) * | 2015-03-18 | 2016-10-06 | Fdk鳥取株式会社 | 筒型電池の封口板及び筒型電池 |
WO2016157749A1 (ja) | 2015-03-27 | 2016-10-06 | 三洋電機株式会社 | 円筒形電池 |
WO2019082711A1 (ja) * | 2017-10-23 | 2019-05-02 | 三洋電機株式会社 | 円筒形電池 |
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JP2016177877A (ja) * | 2015-03-18 | 2016-10-06 | Fdk鳥取株式会社 | 筒型電池の封口板及び筒型電池 |
WO2016157749A1 (ja) | 2015-03-27 | 2016-10-06 | 三洋電機株式会社 | 円筒形電池 |
WO2019082711A1 (ja) * | 2017-10-23 | 2019-05-02 | 三洋電機株式会社 | 円筒形電池 |
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