WO2023145736A1 - 蓄電装置 - Google Patents
蓄電装置 Download PDFInfo
- Publication number
- WO2023145736A1 WO2023145736A1 PCT/JP2023/002129 JP2023002129W WO2023145736A1 WO 2023145736 A1 WO2023145736 A1 WO 2023145736A1 JP 2023002129 W JP2023002129 W JP 2023002129W WO 2023145736 A1 WO2023145736 A1 WO 2023145736A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- intersection
- grooves
- valve
- storage device
- Prior art date
Links
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000011255 nonaqueous electrolyte Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
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- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- RJUFJBKOKNCXHH-UHFFFAOYSA-N Methyl propionate Chemical compound CCC(=O)OC RJUFJBKOKNCXHH-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000003125 aqueous solvent Substances 0.000 description 2
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- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
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- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
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- 229910000831 Steel Inorganic materials 0.000 description 1
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
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- 239000011737 fluorine Substances 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 description 1
- VDVLPSWVDYJFRW-UHFFFAOYSA-N lithium;bis(fluorosulfonyl)azanide Chemical compound [Li+].FS(=O)(=O)[N-]S(F)(=O)=O VDVLPSWVDYJFRW-UHFFFAOYSA-N 0.000 description 1
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- MHAIQPNJLRLFLO-UHFFFAOYSA-N methyl 2-fluoropropanoate Chemical compound COC(=O)C(C)F MHAIQPNJLRLFLO-UHFFFAOYSA-N 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
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- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
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
-
- 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 a power storage device provided with an exhaust valve.
- Patent Document 1 discloses that an electric storage device is provided with an exhaust valve for discharging gas accumulated in the electric storage device when the pressure in the electric storage device exceeds a predetermined value.
- an object of the present disclosure is to provide a more reliable power storage device.
- a power storage device includes an electrode body including a first electrode and a second electrode, and an outer can housing an electrode group.
- An exhaust valve that opens when the value is exceeded is provided, and the exhaust valve is an area surrounded by a plurality of curved first grooves and an annular groove formed by intersecting the plurality of first grooves. a first valve portion, at least one curvilinear second groove extending outward from the first valve portion, and a second valve portion surrounded by the first groove and the second groove and adjacent to the first valve portion.
- the plurality of first grooves has a plurality of intersection points where adjacent first grooves intersect, the plurality of intersection points including a first intersection point and a second intersection point adjacent to the first intersection point, at least One second groove has a first end connected to the first intersection point and a second end located on the second intersection side of the first end and away from the first valve portion.
- the power storage device of the present disclosure can further improve the reliability of the power storage device.
- FIG. 1 is a front cross-sectional view of a power storage device according to an embodiment of the present disclosure
- FIG. 4 is a bottom view of the exterior can of the power storage device according to the embodiment of the present disclosure
- FIG. FIG. 4 is a bottom view showing another example of the exhaust valve used in the power storage device according to the embodiment of the present disclosure
- FIG. 4 is a bottom view showing another example of the exhaust valve used in the power storage device according to the embodiment of the present disclosure
- a power storage device includes an electrode body including a first electrode and a second electrode, and an outer can housing an electrode group.
- An exhaust valve that opens when the value is exceeded is provided, and the exhaust valve is an area surrounded by a plurality of curved first grooves and an annular groove formed by intersecting the plurality of first grooves. a first valve portion, at least one curvilinear second groove extending outward from the first valve portion, and a second valve portion surrounded by the first groove and the second groove and adjacent to the first valve portion.
- the plurality of first grooves has a plurality of intersections where adjacent first grooves intersect, the plurality of intersections including a first intersection and a second intersection adjacent to the first intersection, at least one
- the two second grooves have a first end connected to the first intersection and a second end located on the second intersection side of the first end and spaced from the first valve portion.
- the exhaust valve of the power storage device is surrounded by an annular groove so that the exhaust valve opens at a relatively low pressure. and a second valve section that operates at a higher pressure than the first valve section.
- this exhaust valve only the first valve portion opens when the amount of gas in the power storage device in the abnormal state is relatively small and the pressure in the power storage device is higher than that in the normal power storage device, but not significantly higher.
- this valve opening is also referred to as “first valve opening”.
- the first valve In a state in which the amount of gas in the electrical storage device in an abnormal state has increased sharply and the pressure in the electrical storage device has increased significantly, the first valve not only the part but also the second valve part opens.
- this valve opening is also referred to as “second valve opening”.
- the area of the exhaust port formed by opening the valve becomes larger in the second opening than in the first opening. .
- the first valve portion and the second valve portion enable the valve to be opened with a suitable area of the exhaust port according to the pressure of the power storage device in the abnormal state, thereby efficiently discharging the gas. Therefore, it is possible to further suppress the explosion of the power storage device due to the gas accumulated inside, and the reliability of the power storage device is further improved.
- the first valve section causes the first valve opening, and after the first valve opening, the second valve section causes the second valve opening.
- the bottom part is deformed so that the center part protrudes most, and at that time, stress is concentrated on the intersection of the first valve part in the exhaust valve.
- the two first grooves are broken from a predetermined intersection (hereinafter, this intersection is also referred to as a "breakage intersection") and intersect at this fracture intersection. Break from one end of the side to the other. After that, the fracture progresses in the order of the first grooves closer to the fracture intersection and the furthest grooves. Finally, all the first groove portions may be broken, and the first valve portion may be separated from the exhaust valve.
- the second groove of the second valve section breaks from the first end toward the second end.
- the second valve portion which has been broken to the second end, is in a cantilevered state where the second end is connected to the bottom of the outer can by positioning the second end away from the first groove.
- the connecting portion on the second end side connected to the bottom portion of the second valve portion is finally broken by the momentum of the gas discharged from the power storage device, and the second valve portion is closed. It may be separated from the bottom.
- Each of the plurality of first grooves may be curved so as to protrude outward from the first valve portion when viewed from the thickness direction of the bottom portion. Due to this first groove, when the center of the bottom of the outer can is located within the first valve portion, it is applied when the bottom portion bulges in each first groove compared to the first valve portion in which the first groove is straight. It is possible to suppress biased force.
- the shape of the first groove when viewed from the thickness direction of the bottom portion, is a curved line that protrudes outward from the first valve portion. Compared to the first valve portion having the same number of first grooves and having only linear grooves, it is easier to increase the angle formed by two adjacent first grooves and the intersection point.
- the angle at the intersection tends to increase as described above. may be less resistant to breakage at intersections other than the intersection that is the starting point for opening the first valve portion in the first valve portion.
- At least one second groove may extend in a curvilinear shape so as to protrude in a direction away from the first valve portion. Such a curved shape makes it easier for the second groove to break. Further, of the first end and the second end of the second groove, the second end is positioned away from the first groove. With this configuration, when the second groove breaks, the starting point of breakage can be the first end side connected to the first groove.
- the second groove is preferably located so that the second end of each second groove is separated from other second grooves.
- the curved second groove may partially include a part of the circumference (arc) centering on the center of the bottom portion 15a.
- the portion of the second groove other than the arc may be a curved line positioned inside the circumference. Since such a second groove can be positioned on the circular bottom portion 15a with reference to this arc portion, positioning of the exhaust valve 29 on the bottom portion 15a is facilitated.
- the straight line connecting the first intersection and the second intersection is a straight line ⁇
- the farthest point from the straight line ⁇ in the second groove is a point P
- the point P is , the second end and the first end
- the second end may be closer to the first end
- the second end may be located on the straight line ⁇ side between the straight line ⁇ and the point P.
- that the point P is on the first end side means that the distance between the point P and the first end is smaller than the distance between the point P and the second end in the direction in which the straight line ⁇ extends.
- the fact that the second end is on the straight line ⁇ side means that the distance between the second end and the straight line ⁇ is smaller than the distance between the second end and the point P in the direction perpendicular to the straight line ⁇ .
- the point P is located on the first intersection side in the direction in which the straight line ⁇ extends from the point Q, which is the farthest point from the straight line ⁇ in the first groove, so that the gas It becomes easier to apply the force due to the second groove and the connecting portion on the second end side.
- the second end may be located on the second intersection side of the first intersection and the second intersection.
- the pressure receiving area of the second valve portion becomes easier to expand than the second valve portion whose second end is closer to the first intersection point, and the second groove includes the point P farthest from the straight line ⁇ (the pressure receiving area is large). area) and the second end. Therefore, it becomes easy to apply mechanical stress to the second groove and the connection portion on the second end side, using the area where the pressure receiving area of the second valve portion is large as the force and the connection portion on the second end side as the fulcrum.
- the groove is easily broken, and the second valve part is easily broken from the bottom.
- one of the two first grooves intersecting at the first intersection and the second groove may form a continuous curved groove.
- all of the plurality of first grooves have the same shape and the same length
- at least one second groove is the plurality of second grooves. All the second grooves may have the same shape and the same length.
- This exhaust valve suppresses variations in force applied between the first grooves or between the second grooves when the first valve portion and the second valve portion receive pressure from the gas in the power storage device. can be done.
- the first groove and the second valve portion are more likely to move than in an exhaust valve that does not have rotational symmetry. It is possible to suppress bias in the force applied to the groove.
- the number of intersection points of the first valve portion may be four or less, or may be three or two. In particular, when the number of intersections in the first valve portion is reduced, the number of unbroken first grooves decreases when the breakage intersection and the two first grooves intersecting at the breakage intersection are broken, and the first valve portion is broken. becomes easier.
- the area including the point P in the exhaust valve of the present disclosure is the portion where the pressure receiving area is the largest in the second valve portion (the distance between the first groove and the second groove is maximum). not a thing A region located in the vicinity of the region including the point P may have the largest pressure receiving area.
- FIG. 1 is a front cross-sectional view of a battery 10, which is an example of a power storage device according to this embodiment.
- the battery 10 includes an electrode body 14 , an electrolyte (not shown), a bottomed cylindrical outer can 15 that houses the electrode body 14 and the electrolyte, and a sealing body 16 that closes the opening of the outer can 15 .
- the direction along the axial direction of the outer can 15 will be referred to as the "vertical direction”
- the sealing body 16 side will be referred to as "upper”
- the bottom side of the outer can 15 will be referred to as "lower”.
- the direction perpendicular to the axial direction of the outer can 15 is defined as "lateral direction”
- the radial center side of the outer can 15 is defined as “inner side”
- the radial outer side is defined as "outer side”.
- the power storage device in the present embodiment will be described by taking a lithium-ion secondary battery as an example among batteries.
- the power storage device of the present disclosure may be a secondary battery such as a lithium ion secondary battery or a nickel hydride battery, or a capacitor such as an electric double layer capacitor or a lithium ion capacitor.
- the electrode body 14 has a wound structure in which the positive electrode 11 and the negative electrode 12 are wound with the separator 13 interposed therebetween.
- the electrode body 14 is not limited to a wound type, and may be a laminated type.
- the positive electrode 11 has, for example, a strip-shaped positive electrode current collector and positive electrode mixture layers formed on both sides of the positive electrode current collector.
- the positive electrode current collector for example, a foil of a metal such as aluminum, a film in which the metal is arranged on the surface layer, or the like is used.
- the positive electrode mixture layer contains at least a positive electrode active material, and may contain a conductive agent, a binder, and the like. Examples of the positive electrode active material include lithium-containing transition metal oxides containing a transition metal element such as Ni.
- the positive electrode 11 can be produced by applying a positive electrode mixture slurry in which a positive electrode active material and the like are dispersed in a solvent on both sides of a positive electrode current collector, and then drying and rolling the positive electrode mixture layers.
- the negative electrode 12 has, for example, a strip-shaped negative electrode current collector and negative electrode mixture layers formed on both sides of the negative electrode current collector.
- the negative electrode current collector for example, a foil of a metal such as copper, a film in which the metal is arranged on the surface layer, or the like is used.
- the negative electrode mixture layer contains at least a negative electrode active material and may contain a binder and the like. Examples of negative electrode active materials include carbon materials such as natural graphite and artificial graphite, and metal compounds such as silicon compounds.
- the negative electrode 12 can be produced by applying a negative electrode mixture slurry in which a negative electrode active material and the like are dispersed in a solvent on both sides of a negative electrode current collector, and then drying and rolling the negative electrode mixture layers.
- a porous sheet having ion permeability and insulation can be used.
- porous sheets include microporous thin films, woven fabrics, and non-woven fabrics.
- an olefin resin such as polyethylene or polypropylene can be used.
- the positive electrode lead 19 extends upward through the through hole of the upper insulating plate 17 and is welded to the lower surface of the filter 22 which is the bottom plate of the sealing member 16 .
- the cap 26, which is the top plate of the sealing member 16 electrically connected to the filter 22 serves as a positive terminal.
- the negative electrode lead 20 passes through the through hole of the lower insulating plate 18, extends toward the bottom portion 15a of the outer can 15, and is welded to the inner surface of the bottom portion 15a to form a joint.
- the outer can 15 serves as a negative terminal.
- At least one electrode plate of the positive electrode 11 and the negative electrode 12 forms an uncoated portion in which the mixture layer is not formed at one end of the strip-shaped electrode plate in the width direction.
- the electrode plate may be wound so as to protrude from the separator in the winding axial direction of the electrode body 14, and the projecting uncoated portion may form one end face of the electrode body 14 in the winding axial direction. This end surface may be joined to a conductive collector plate, and current may be collected from the electrode plate to the collector plate.
- the outer can 15 is a bottomed cylindrical metal container.
- the thickness of the outer can 15 is, for example, 0.2 mm to 1.0 mm.
- the outer can 15 has a bottom and side walls erected along the periphery of the bottom.
- the bottom portion 15 a of the outer can 15 has a first groove 30 and a second groove 32 .
- the first groove 30 and the second groove 32 rupture when the internal pressure of the battery 10 increases in an abnormal state, and gas is discharged from the ruptured portion.
- a groove portion 21 is formed in the side wall portion of the outer can 15 .
- the groove portion 21 supports the sealing member 16 from below.
- the groove portion 21 is preferably formed in an annular shape along the circumferential direction of the outer can 15 .
- Metals constituting the outer can 15 include copper, aluminum, iron, nickel, stainless steel, and alloys of these metals.
- the outer can 15 serves as a negative electrode terminal, an iron can whose inner surface is nickel-plated, a copper can, or the like is preferable.
- the outer can 15 is not limited to this material.
- the upper opening of the outer can 15 is closed with a sealing member 16 via a gasket 27, so that the inside of the battery 10 is sealed.
- the sealing body 16 has a filter 22, a lower valve body 23, an insulating member 24, an upper valve body 25, and a cap 26 which are stacked in order from the electrode body 14 side.
- Each member constituting the sealing member 16 has, for example, a disk shape or a ring shape, and each member other than the insulating member 24 is electrically connected to each other.
- the lower valve body 23 and the upper valve body 25 are connected to each other at their central portions, and an insulating member 24 is interposed between their peripheral edge portions.
- the outer can 15 contains an electrolyte in addition to the electrode assembly 14 .
- an aqueous electrolyte or a non-aqueous electrolyte can be used, but the non-aqueous electrolyte is preferably used.
- the nonaqueous solvent (organic solvent) for the nonaqueous electrolyte include carbonates, lactones, ethers, ketones, and esters. These solvents can be used in combination of two or more. When using a mixture of two or more solvents, it is preferable to use a mixed solvent containing a cyclic carbonate and a chain carbonate.
- Ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), and the like can be used as the cyclic carbonate.
- Dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC) and the like can be used as chain carbonates.
- Carbonic acid esters such as methyl acetate (MA) and methyl propionate (MP) are preferably used as esters.
- the non-aqueous solvent may contain a halogen-substituted product obtained by substituting at least part of the hydrogen atoms of these solvents with halogen atoms such as fluorine. It is preferable to use, for example, fluoroethylene carbonate (FEC) and methyl fluoropropionate (FMP) as the halogen-substituted compound.
- FEC fluoroethylene carbonate
- FMP methyl fluoropropionate
- LiPF 6 LiBF 4 , LiCF 3 SO 3 , lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, etc. and mixtures thereof can be used.
- the amount of the electrolyte salt dissolved in the non-aqueous solvent is, for example, 0.5 mol/L to 2.0 mol/L.
- vinylene carbonate (VC) or propane sultone-based additives may be added.
- FIG. 2 is a bottom view illustrating the bottom portion 15a of the outer can 15 used in the battery 10 of this embodiment.
- An exhaust valve 29 is formed in the bottom portion 15a of the outer can 15 as shown in FIG.
- the exhaust valve 29 includes a plurality of curved first grooves 30, a first valve portion 31 surrounded by an annular groove formed by intersecting the plurality of first grooves 30 in the bottom portion 15a, and a first valve portion. It includes at least one curvilinear second groove 32 extending outwardly from 31 and a second valve portion 33 surrounded by the first groove 30 and the second groove 32 .
- the three first grooves 30 and the first valve portions 31 have intersections 30a, 30b, and 30c at which adjacent first grooves 30 intersect.
- the first valve portion 31 is arranged so that its center coincides with the center of the bottom portion 15a.
- Each of the plurality of first grooves 30 is configured with a curve curved like an arch so as to protrude outward from the first valve portion 31 . Since the first groove 30 has such a curvilinear shape, two adjacent first grooves at intersections 30a, 30b, and 30c and each intersection point are different than the first valve portion in which the first grooves are composed only of straight lines. You can increase the angle of the interior angle between This increases the stress on the first groove 30 at the intersections 30a, 30b, and 30c, and facilitates the first valve opening by the first valve portion 31. As shown in FIG.
- the curve forming the first groove 30 is, for example, a curve along an arc located between the remaining two intersections of the circumference of an imaginary circle centered at one intersection and passing through the remaining two intersections.
- the first valve portion 31 is provided with three intersections 30a, 30b, and 30c.
- the two first grooves 30 connected to this fractured intersection are fractured, and then the unbroken first grooves 30 becomes one. Therefore, after the first two first grooves are broken, the number of first grooves that need to be broken is small, which facilitates separation of the first valve portion 31 .
- first grooves 30 have the same shape and the same length. Due to such dimensions and shape, the gas force can be applied more evenly to each of the first grooves 30 . Also, the intersections 30a, 30b, and 30c may be arranged on the same circumference C1. In addition, as shown in FIG. 2 , a joint portion 15 b may be formed in the center of the first valve portion 31 so as to be joined to the negative electrode lead 20 in the bottom portion 15 a.
- three second grooves 32 are formed. It has two ends 32b. The second end 32b functions as a connecting portion with the bottom portion 15a in the second valve portion 33 . Each of the second grooves 32 extends to form an arched curve that protrudes outward from the first valve portion 31 .
- the second groove 32 connected to the intersection point 30a constitutes the first groove 30 and the second valve portion 33 between the intersection point 30a and the intersection point 30b
- the second groove 32 connected to the intersection point 30b constitutes the first groove 30 and the second valve portion 33 between the intersection 30b and the intersection 30c
- the second groove 32 connected to the intersection 30c forms the first groove 30 and the second valve portion 33 between the intersection 30c and the intersection 30a. It constitutes the valve portion 33 .
- a straight line connecting the intersection points 30a and 30b is a straight line ⁇
- a point farthest from the straight line ⁇ in the second groove 32 is a point P.
- the point P is on the intersection 30a side of the intersection points 30a and 30b. located in With the point P at such a position, the distance from the second end 32b side, which is the connecting portion with the bottom portion 15a, of the second valve portion 33 tends to become longer.
- a portion including the point P in the second valve portion 33 is a region where the pressure receiving area is most likely to be increased.
- the portion of the second valve portion 33 that receives the greatest force from the gas moves away from the connecting portion compared to the second valve portion located on the second end side.
- force can be easily applied to the second groove 32 and the connecting portion with the connecting portion as the fulcrum and the portion receiving the greatest force from the gas as the force point.
- This configuration facilitates the second valve opening.
- the point P can also be said to be a point in contact with the straight line ⁇ parallel to the straight line ⁇ in the second groove 32 as shown in FIG. 2 .
- the point Q when a point Q is the farthest point from the straight line ⁇ , the point Q is closer to the intersection point 30a than the point Q in the extending direction of the straight line ⁇ .
- the area of the pressure receiving portion including the point P can be easily increased.
- the width of the connecting portion between the second valve portion 33 and the bottom portion 15a can be easily narrowed. Become. Therefore, it becomes easier to separate the second valve portion 33 from the bottom portion 15a.
- the second end 32b is located on the intersection 30b side of the intersection 30a and the intersection 30b in the direction in which the straight line ⁇ extends. This makes it easier to increase the pressure receiving area of the second valve portion 33 .
- the second groove 32 connected to the intersection 30a forms a continuous curve together with the first groove 30 between the intersections 30a and 30c.
- the second groove 32 can reduce the time lag between when the first valve opening starts and when the second valve opening starts. With this configuration, it is possible to smoothly shift from the first valve opening to the second valve opening, and to expand the area of the exhaust port of the exhaust valve 29 more quickly.
- a virtual circle centered on the bottom portion 15a and passing through all the intersections for an outer can having an outer diameter of 46 mm
- the diameter may be, for example, 10-30 mm.
- this virtual may be larger than the diameter of the imaginary circle passing through the intersection, eg 20-40 mm.
- FIG. 1 A modification of the exhaust valve 29 used in the battery 10 will be described with reference to FIGS. 3 and 4.
- FIG. 1 A modification of the exhaust valve 29 used in the battery 10 will be described with reference to FIGS. 3 and 4.
- FIG. 3 shows an exhaust valve 39 in which the first groove, the second groove, and the number of intersections of the first valve portion are all four.
- FIG. 4 shows an exhaust valve 59 in which the number of intersections of the first groove, the second groove, and the first valve portion is two.
- both the exhaust valve 39 and the exhaust valve 59 are similarly exhaust valves in which the first valve portion and the second valve portion can be easily opened, and reliability as an exhaust valve can be enhanced.
- a sample is prepared by omitting the electrode body, the upper insulating plate, the lower insulating plate, the positive electrode lead, and the negative electrode lead from the configuration of the battery described in FIG.
- An exhaust valve shown in FIG. 2 is formed at the bottom of the outer can.
- the diameter of an imaginary circle passing through three intersections in the first valve portion is 22 mm for an outer can made of a nickel-plated steel plate with an outer diameter of 46 mm, and the imaginary circle included in the second groove of the exhaust valve is 22 mm.
- the diameter of the curved portion along the arc of the circle is 28.5 mm
- the thickness of the portion where the exhaust valve is not formed at the bottom of the outer can is 0.7 mm
- the depth of the first groove and the second groove was set to 0.6 mm.
- a hole is formed in the side peripheral surface of the outer can of this sample, a tube is inserted into this hole, and nitrogen gas is filled from this hole at a constant rate of 0.02 MPa/s using a pressure applying device. Then, it was confirmed whether the exhaust valve operates when the inside of the sample reaches 1.7 MPa.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
以下に本開示の排気弁が開弁する際の挙動の一例を説明する。
以下に、本開示の排気弁の構成の詳細について説明していく。
図1で説明した電池の構成をうち電極体、上部絶縁板、下部絶縁板、正極リード、負極リードを除いたサンプルを用意する。外装缶の底部には図2で図示された排気弁が形成されている。なおサンプルでは、外径が46mmのニッケルめっき鋼板からなる外装缶に対して、第1弁部における3つの交点を通る仮想の円の直径が22mmであり、排気弁の第2溝に含まれる仮想の円の円弧に沿う曲線部分の直径が、28.5mmであり、外装缶の底部の排気弁が形成されていない部分の厚みが0.7mmであり、第1溝、第2溝の深さを0.6mmとした。
11 正極
12 負極
13 セパレータ
14 電極体
15 外装缶
15a 底部
15b 接合部
16 封口体
17 上部絶縁板
18 下部絶縁板
19 正極リード
20 負極リード
21 溝部
22 フィルタ
23 下弁体
24 絶縁部材
25 上弁体
26 キャップ
26a 開口部
27 ガスケット
29、39、59 排気弁
30 第1溝
30a、30b、30c 交点
31 第1弁部
32 第2溝
32a 第1端
32b 第2端
33 第2弁部
Claims (6)
- 第1電極と第2電極とを含む電極体と、前記電極体を収容する外装缶とを備え、前記外装缶の底部には、前記外装缶内の圧力が所定値を超えたときに開弁する排気弁が設けられ、前記排気弁は、曲線状の複数の第1溝と、前記複数の第1溝が交わって形成された環状の溝で囲われた領域である第1弁部と、前記第1弁部から外に延びた曲線状であり少なくとも一つの第2溝と、前記第1溝と前記第2溝に囲われて、前記第1弁部と隣接した第2弁部とを含み、前記複数の第1溝は、隣り合う第1溝が交わる複数の交点を有し、前記複数の交点は第1交点と、前記第1の交点と隣接した第2交点とを含み、前記少なくとも一つの第2溝は、前記第1交点に接続した第1端と、前記第1端より第2交点側に位置し、前記第1弁部から離れて位置する第2端とを有する、蓄電装置。
- 前記第1交点と前記第2交点を結ぶ直線を直線αとし、前記第2溝において、前記直線αから最も遠い箇所を点Pとするとき、前記点Pは、前記第2端および前記第1端のうち、前記第1端に近く、前記第2端は、前記直線αと前記点Pのうち、前記直線α側に位置する、請求項1に記載の蓄電装置。
- 前記第2端は、前記第1交点および前記第2交点のうち、第2交点側に位置する、請求項1に記載の蓄電装置。
- 前記第1交点で交わる2つの第1溝のうち、一方の第1溝と前記第2溝は連続した曲線状の溝を構成する、請求項1又は請求項2に記載の蓄電装置。
- 前記少なくとも一つの第2溝は、複数の第2溝であり、前記複数の交点の数と前記複数の第2溝の数は等しい、請求項1~3のいずれかに記載の蓄電装置。
- 前記複数の第1溝はいずれも、同じ形状であるとともに、同じ長さであり、前記少なくとも一つの第2溝は、複数の第2溝であり、前記複数の第2溝はいずれも、同じ形状であるとともに、同じ長さである、請求項1~5のいずれかに記載の蓄電装置。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006338979A (ja) | 2005-06-01 | 2006-12-14 | Shin Kobe Electric Mach Co Ltd | 円柱状リチウム二次電池 |
WO2010100731A1 (ja) * | 2009-03-04 | 2010-09-10 | トヨタ自動車株式会社 | 密閉型電池及び密閉型電池の製造方法 |
JP2015149161A (ja) * | 2014-02-05 | 2015-08-20 | 株式会社Gsユアサ | 蓄電素子及び安全弁 |
JP2019153388A (ja) * | 2018-02-28 | 2019-09-12 | 三洋電機株式会社 | 非水電解質二次電池 |
CN112382826A (zh) * | 2021-01-15 | 2021-02-19 | 蜂巢能源科技有限公司 | 用于电芯的防爆阀、电芯及电池模组 |
JP2021136194A (ja) * | 2020-02-28 | 2021-09-13 | 愛三工業株式会社 | 密閉型蓄電装置の防爆弁 |
-
2023
- 2023-01-24 CN CN202380019057.3A patent/CN118648173A/zh active Pending
- 2023-01-24 WO PCT/JP2023/002129 patent/WO2023145736A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006338979A (ja) | 2005-06-01 | 2006-12-14 | Shin Kobe Electric Mach Co Ltd | 円柱状リチウム二次電池 |
WO2010100731A1 (ja) * | 2009-03-04 | 2010-09-10 | トヨタ自動車株式会社 | 密閉型電池及び密閉型電池の製造方法 |
JP2015149161A (ja) * | 2014-02-05 | 2015-08-20 | 株式会社Gsユアサ | 蓄電素子及び安全弁 |
JP2019153388A (ja) * | 2018-02-28 | 2019-09-12 | 三洋電機株式会社 | 非水電解質二次電池 |
JP2021136194A (ja) * | 2020-02-28 | 2021-09-13 | 愛三工業株式会社 | 密閉型蓄電装置の防爆弁 |
CN112382826A (zh) * | 2021-01-15 | 2021-02-19 | 蜂巢能源科技有限公司 | 用于电芯的防爆阀、电芯及电池模组 |
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