WO2022196623A1 - 封口板およびそれを用いた蓄電装置 - Google Patents
封口板およびそれを用いた蓄電装置 Download PDFInfo
- Publication number
- WO2022196623A1 WO2022196623A1 PCT/JP2022/011259 JP2022011259W WO2022196623A1 WO 2022196623 A1 WO2022196623 A1 WO 2022196623A1 JP 2022011259 W JP2022011259 W JP 2022011259W WO 2022196623 A1 WO2022196623 A1 WO 2022196623A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing plate
- flange
- storage device
- power storage
- relay
- Prior art date
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 149
- 230000002093 peripheral effect Effects 0.000 claims description 17
- 230000007704 transition Effects 0.000 abstract 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 239000011888 foil Substances 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000012447 hatching Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- 229920001155 polypropylene Polymers 0.000 description 1
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- 150000003377 silicon compounds Chemical class 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/80—Gaskets; Sealings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/10—Housing; Encapsulation
- H01G2/103—Sealings, e.g. for lead-in wires; Covers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/08—Housing; Encapsulation
- H01G9/10—Sealing, e.g. of lead-in wires
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
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- 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
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- 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
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/143—Fireproof; Explosion-proof
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- 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
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- 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
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- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells having curved cross-section, e.g. round or elliptic
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- 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
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
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- 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
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- H01M50/186—Sealing members characterised by the disposition of the sealing members
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- 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
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- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/545—Terminals formed by the casing of the cells
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- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
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- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/08—Housing; Encapsulation
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- 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 sealing plate and a power storage device using the same.
- Power storage devices are widely used as power sources for the operation of electronic devices and for driving moving bodies such as automobiles.
- a cylindrical battery is an example of this power storage device.
- This cylindrical battery has a sealing body containing a valve body. This valve body seals the opening of the armored can via a gasket at the opening of the armored can.
- the following patent document 1 is mentioned as a prior document disclosing such a sealing member.
- valve body Since the valve body is formed by processing a metal material such as aluminum, it has a certain level of reliability against external and internal stress. On the other hand, in order to further increase the internal volume of the power storage device and further reduce the size of the power storage device, there is a demand for further thinning of the sealing plate such as the valve body. However, when the sealing plate becomes thin, the resistance to the stress described above tends to decrease, and the reliability of the sealing plate tends to decrease. Accordingly, an object of the present disclosure is to provide a highly reliable sealing plate and a power storage device using the same.
- the sealing plate which is one aspect of the present disclosure, includes an annular flange provided on the outer peripheral edge, an annular ridge located closer to the center than the flange and thicker than the flange, and located closer to the center than the ridge.
- the thinnest fragile portion of the sealing plate an annular relay portion located closer to the center than the fragile portion, and a central portion located closer to the center than the relay portion and including the center portion of the sealing plate.
- FIG. 1 is a perspective cross-sectional view partially extracting and showing an example of a power storage device according to an embodiment of the present disclosure
- FIG. FIG. 2 is a front cross-sectional view partially extracting and showing the power storage device of FIG. 1
- FIG. 2 is a perspective cross-sectional view partially extracting and showing an example of a sealing plate according to an embodiment of the present disclosure
- 4 is a front cross-sectional view of the sealing plate of FIG. 3
- FIG. 5 is a front cross-sectional view showing a modification of the sealing plate in the embodiment of the present disclosure
- FIG. 10 is a front cross-sectional view showing another modification of the sealing plate in the embodiment of the present disclosure
- FIG. 4 is a perspective cross-sectional view showing a partially extracted modification of the power storage device according to the embodiment of the present disclosure
- FIG. 10 is a perspective cross-sectional view partially extracting and showing another modification of the power storage device according to the embodiment of the present disclosure;
- the sealing plate of the present disclosure includes an annular flange portion provided on the outer peripheral edge, an annular raised portion located closer to the center than the flange and thicker than the flange, and located closer to the center than the raised portion. It has the thinnest fragile portion, an annular relay portion positioned closer to the center than the fragile portion, and a center portion positioned closer to the center than the relay portion and including the center portion of the sealing plate.
- the fragile portion is separated from the flange portion in a first direction parallel to the thickness direction. Further, the relay portion protrudes in a second direction opposite to the first direction.
- the intermediate portion located closer to the center of the sealing plate than the fragile portion is thicker, so that the fragile portion moves in the second direction opposite to the first direction away from the flange portion.
- the protruding dimension can be reduced. Therefore, even if the relay portion and the central portion are thickened, it is possible to prevent the sealing plate from becoming thick.
- the center portion located closer to the center of the sealing plate than the relay portion is thicker than the relay portion and protrudes in the same direction as the relay portion, the amount of protrusion can be suppressed similarly to the relay portion.
- the first direction is the upper side of the sealing plate
- the second direction is the lower side of the sealing plate
- the lower surface of the relay portion has a protruding slope
- the raised portion is the flange portion.
- the fragile portion protrudes upward from the upper surface
- the fragile portion is located above the flange portion
- the slope of the relay portion is formed on the bottom surface of the relay portion
- the fragile portion side of the relay portion is thicker on the central portion side than on the fragile portion side.
- the protuberant portion protrudes upward from the flange portion
- the fragile portion is positioned above the flange portion
- the lower surface of the relay portion does not necessarily have a slope.
- the raised portion may project downward from the flange portion
- the fragile portion may be positioned below the flange portion
- a slope may be formed on the top surface of the intermediate portion.
- the lower surface of the relay portion is not limited to a slope.
- the raised portion may protrude both above and below the flange portion. In that case, when viewed from the radial direction, the weakened portion may be located above or below the flange portion in the thickness direction of the flange portion.
- the lower surface of the intermediate portion may be stepped.
- the slope of the relay portion may overlap the flange portion when viewed from the radial direction. By extending the slope in this way, the thickness of the relay portion can be easily increased.
- the upper surface of the relay portion may be a flat surface, and the upper surface of the weak portion, the upper surface of the raised portion, and the upper surface of the relay portion may be flush with each other.
- the sealing plate of the present disclosure may be thickest in the central portion of the sealing plate.
- a power storage device using the sealing plate of the present disclosure includes an electrode group including a first electrode and a second electrode, an exterior body that houses the electrode group, and an opening of the exterior body that is closed with an insulating gasket.
- a sealing plate may be provided.
- the sealing plate may be the sealing plate described above, the first electrode may be electrically connected to the sealing plate, and the second electrode may be electrically connected to the exterior body.
- the exterior body includes a cylindrical portion that accommodates the electrode group therein, a bottom portion that closes one end of the cylindrical portion, and an opening provided at the other end of the cylindrical portion.
- the tubular portion may have a groove portion in which the outer peripheral surface is annularly recessed so that the inner peripheral surface of the tubular portion protrudes in the radial direction of the sealing plate.
- the gasket may be cylindrical and cover the upper and lower surfaces of the flange portion of the sealing plate and the outer peripheral surface connecting the upper and lower surfaces of the flange portion.
- a sealing plate is provided on the inner peripheral surface of the groove via a cylindrical gasket, and the opening of the exterior body falls toward the center of the sealing plate and is crimped to abut on the upper surface of the flange via the gasket. You may have a part. With this configuration, the reliability of the sealing plate is increased, so that a power storage device with higher reliability can be obtained.
- the raised portion of the sealing plate protrudes upward from the upper surface of the flange portion, and the gasket that covers the upper surface of the flange portion extends closer to the raised portion than the caulked portion.
- an annular wall portion may be provided that abuts the outer surface of the ridge.
- the upper end of the wall portion of the gasket may be positioned above the upper end of the sealing plate.
- the crimped portion electrically connected to the second electrode and the sealing plate electrically connected to the first electrode can be separated by the wall portion. Therefore, it becomes easier to insulate the crimped portion and the sealing plate.
- FIG. 1 is a perspective cross-sectional view showing a partially extracted power storage device 10 according to the embodiment of the present disclosure.
- FIG. 2 is a front cross-sectional view showing a partially extracted power storage device 10. As shown in FIG.
- hatching applied to the cut surface of the power storage device 10 is omitted in consideration of the visibility of the drawing.
- most of the outline of the space behind the cut surface of power storage device 10 is omitted in consideration of the visibility of the drawing.
- the power storage device 10 includes an electrode group 11 including a first electrode and a second electrode, an exterior body 12 that houses the electrode group 11, and an opening 12b of the exterior body 12.
- FIG. 3 is a perspective sectional view showing a part of the sealing plate 13.
- FIG. 4 is a front sectional view of the sealing plate 13 of FIG. 3.
- FIG. 3 is a perspective sectional view showing a part of the sealing plate 13.
- FIG. 4 is a front sectional view of the sealing plate 13 of FIG. 3.
- the sealing plate 13 is electrically connected to the first electrode of the electrode group 11 (detailed configuration will be described later). Therefore, the sealing plate 13 is made of a conductive member. Materials constituting the sealing plate 13 are, for example, aluminum, copper, nickel, iron, titanium, or alloys of these metals.
- the sealing plate 13 is formed by processing the metal plate, for example. Aluminum is used for the sealing plate 13 as an example.
- the sealing plate 13 is, for example, a disc.
- the sealing plate 13 includes an annular flange portion 13a provided on the outer peripheral edge, and an annular ridge that is closer to the center of the sealing plate 13 than the flange portion 13a and is thicker than the flange portion 13a.
- the fragile portion 13c is separated from the flange portion 13a in the first direction in the thickness direction of the sealing plate 13 (or the height direction of the power storage device 10), and the relay portion 13d is in the second direction opposite to the first direction. protrudes to Here, in the sealing plate 13, the first direction is the top of the sealing plate 13, and the second direction is the bottom of the sealing plate 13 (the direction facing the electrode group 11). However, the first direction may be downward and the second direction may be upward.
- the flange portion 13a is a flat, ring-shaped plate having an upper surface, a lower surface, and an outer peripheral surface connecting the upper surface and the lower surface.
- the flange portion 13a is fixed to the exterior body 12 in a state sandwiched in the thickness direction via the gasket 14 by the groove portion 12d and the crimping portion 12c of the exterior body 12, which will be described later.
- the distance between the groove portion 12d and the crimped portion 12c can be reduced, and the arrangement space of the sealing plate 13 of the power storage device 10 can be reduced.
- the raised portion 13b is a portion of the sealing plate 13 that is thicker than the flange portion 13a.
- the raised portion 13b enhances the rigidity of the sealing plate 13. As shown in FIG.
- the raised portion 13b extends from the flange portion 13a, and the raised portion 13b protrudes upward from the flange portion 13a. With this configuration, the crimped portion 12c and part of the gasket 14 can be accommodated in the space partitioned by the flange portion 13a and the raised portion 13b. Therefore, dead space can be utilized as the power storage device 10 .
- the fragile portion 13c is annular and is the thinnest portion of the sealing plate 13. Weak portion 13c is preferentially broken at sealing plate 13 when the pressure in power storage device 10 rises and exceeds a predetermined pressure. After the breakage, the gas accumulated in power storage device 10 is released from the broken portion. Fracture of fragile portion 13c can prevent the pressure in power storage device 10 from excessively increasing and bursting of power storage device 10 at a location other than fragile portion 13c.
- the weakened portion 13c is adjacent to the raised portion 13b in the radial direction.
- the fragile portion 13c is formed on the upper end side of the raised portion 13b. Therefore, the fragile portion 13c is separated upward from the flange portion 13a.
- the relay portion 13d is a portion that connects the fragile portion 13c and a central portion 13e, which will be described later.
- the relay portion 13d has different thicknesses in the radial direction. Specifically, it is thin on the fragile portion 13c side and thick on the central portion 13e side. With this configuration, it is easier to form the fragile portion 13c than, for example, a relay portion that becomes thinner as it approaches the central portion. In addition, since it is possible to avoid forming a separate thin region at a location apart from the fragile portion 13c, the reliability of the operation of the fragile portion 13c can be improved, and since the relay portion 13d can be thickened, the rigidity of the relay portion 13d can be increased. can.
- a ring-shaped slope 13f is formed on the lower surface of the relay portion 13d so as to protrude downward in order to realize the above-described thickness magnitude relationship.
- One end of the slope 13f in the radial direction is connected to the lower surface of the fragile portion 13c.
- the other end of the slope 13f is connected to the upper end of the lower columnar portion of the central portion 13e.
- the upper surface of the relay portion 13d is a flat surface parallel to the radial direction. With such a configuration, the relay portion 13d can be formed thick.
- the slope 13f overlaps the flange portion 13a when viewed from the radial direction. Furthermore, a portion of the annular slope 13f extends downward from the flange portion 13a.
- the central portion 13e is located at the center of the sealing plate 13 and is the thickest portion of the sealing plate 13, for example.
- One end of the lead 15 is joined to the lower surface of the central portion 13e.
- the upper surface of the central portion 13e may have a flat surface parallel to the radial direction, and may be joined with a power collecting member that electrically connects a plurality of power storage devices.
- the central portion 13e is the thickest part of the sealing plate 13 on the assumption that it will be joined to the lead 15 by welding, or that the central portion 13e will be joined to the current collector plate by welding.
- the portion 13e does not have to be the thickest part of the sealing plate 13 .
- the central portion 13e may be thinner than the raised portion 13b.
- the upper surfaces of the central portion 13e, the intermediate portion 13d, the fragile portion 13c, and the raised portion 13b are flush with each other. With this configuration, even if a bending moment is generated on the sealing plate 13 from the flange portion 13a or the like, the region is not flush with the sealing plate (specifically, the sealing plate has a recess as the upper surface thereof). In comparison, the upper surfaces pull each other and deformation due to the same moment can be suppressed.
- the rigidity of the sealing plate 13 By increasing the rigidity of the sealing plate 13 in this way, even if the flange portion 13a is thin, the rigidity of the sealing plate 13 can be increased to a predetermined level or more. Further, since each region is flush with the protruding portion 13b in a state in which it protrudes upward, alignment with the upper end of the crimped portion 12c is facilitated.
- FIG. 5A is a front cross-sectional view of a sealing plate 23 that is a modified example of the sealing plate 13.
- FIG. 5B is a front cross-sectional view of another modification of the sealing plate 13.
- FIG. 5A is a front cross-sectional view of a sealing plate 23 that is a modified example of the sealing plate 13.
- FIG. 5B is a front cross-sectional view of another modification of the sealing plate 13.
- the sealing plate 23 is directly connected to the central portion 13e with a constant slope without changing the inclination of the oblique surface 23f compared to the sealing plate 13.
- Such a configuration makes it easier to increase the thickness of the relay portion 23d of the sealing plate 23, especially on the side of the central portion 23e. Therefore, the rigidity of the relay portion 23d can be further increased.
- the sealing plate 33 is larger than the sealing plate 23 in the lower surface of the central portion 33e.
- the slope 33f of the relay portion 33d of the sealing plate 33 is equal to the slope 33f of the relay portion 23d of the sealing plate 23.
- the slope is steeper. Since the inclination becomes steep, the relay portion 33d becomes thicker than the relay portion 23d, and the rigidity of the relay portion 33d can be increased.
- the electrode group 11 has, for example, a strip-shaped first electrode, a strip-shaped second electrode, and a strip-shaped separator interposed between the first and second electrodes.
- the first electrode and the second electrode constitute an electrode group 11 by being wound with a separator interposed therebetween.
- the first electrode is, for example, the positive electrode.
- the positive electrode has, for example, a sheet-like collector foil and a composite layer formed on at least one surface of the collector foil.
- the collector foil is made of a conductive material, such as aluminum, copper, nickel, iron, titanium, or alloys of these metals.
- aluminum is used for the collector foil of the first electrode of the electrode group 11 .
- the mixture layer contains a positive electrode active material, conductive particles, a binder, and the like. Examples of positive electrode active materials include lithium composite metal oxides.
- the second electrode is, for example, a negative electrode.
- the negative electrode has, for example, a sheet-like collector foil and a composite layer formed on at least one surface of the collector foil.
- the collector foil is made of a conductive material, such as aluminum, copper, nickel, iron, titanium, or alloys of these metals.
- copper is used for the collector foil of the second electrode of the electrode group 11 .
- the mixture layer contains a negative electrode active material, conductive particles, a binder, and the like. Examples of negative electrode active materials include carbon materials and silicon compounds.
- the separator An insulating material is used for the separator.
- a microporous film made of polypropylene may be used.
- the first electrode may be the negative electrode
- the second electrode may be the positive electrode.
- the exterior body 12 is electrically connected to the second electrode. Therefore, the exterior body 12 is composed of a conductive member. Examples of materials for the exterior body 12 include aluminum, copper, nickel, iron, titanium, and alloys of these metals. For example, iron is used as the material of the exterior body 12 .
- the exterior body 12 includes, for example, a cylindrical cylindrical portion 12a, a bottom portion of the cylindrical portion 12a that closes one end of the power storage device 10 in the height direction, and an opening provided at the other end of the cylindrical portion 12a in the height direction. 12b.
- the electrode group 11 is accommodated together with the electrolytic solution on the bottom side of the tubular portion 12a. At this time, the winding axis direction of electrode group 11 is parallel to the height direction of power storage device 10 .
- the same insulating plate as the insulating plate 16 may be provided between the electrode group 11 and the bottom. In this case, the lead that electrically connects the second electrode and the exterior body 12 may bypass the insulating plate and be connected to the bottom.
- a through hole may be formed in the insulating plate and the lead may extend through the through hole.
- An annular groove portion 12d may be formed above the space in which the electrode group 11 of the cylindrical portion 12a is accommodated.
- the groove portion 12d is a recess extending in the circumferential direction on the outer peripheral surface of the tubular portion 12a, and radially protrudes from the corresponding portion of the inner peripheral surface of the tubular portion 12a.
- a gasket 14 is placed on the inner peripheral surface of the groove portion 12d.
- an insulating plate 16 may be interposed between the groove portion 12d and the electrode group 11 .
- the insulating plate 16 may be made of insulating resin, rubber, or the like. Further, the insulating plate 16 may be formed with through-holes through which the leads 15 are inserted.
- the opening 12b is a region located above the groove 12d in the tubular portion 12a.
- a sealing plate 13 is fixed via a gasket 14 to the opening 12b.
- a crimped portion 12c is provided at the tip of the opening 12b.
- the crimped portion 12 c is formed by bending the tip portion of the opening so as to fall toward the center of the sealing plate 13 .
- the crimped portion 12 c is bent to fall down, thereby pushing the upper and lower surfaces of the flange portion 13 a of the sealing plate 13 covered with the gasket 14 in the thickness direction of the sealing plate 13 .
- the crimped portion 12c seals the opening 12b together with the sealing plate 13 and the gasket 14. As shown in FIG.
- the crimped portion 12c since the crimped portion 12c is electrically connected to the second electrode, the crimped portion 12c may function as a connection point for the current collecting member.
- the gasket 14 is, for example, an insulating elastic body.
- the gasket 14 is cylindrical and may have a bottom portion with a through hole at the lower end in the thickness direction of the sealing plate 13 . This bottom portion is interposed between the lower surface of the flange portion 13a and the inner peripheral surface of the groove portion 12d and is compressed by the caulking portion 12c. Also, the raised portion 13b, the fragile portion 13c, the intermediate portion 13d, and the central portion 13e of the sealing plate 13 are exposed into the exterior body 12 through the through hole in the bottom portion of the gasket 14. As shown in FIG.
- the upper end of the tubular portion of the gasket 14 is bent so as to fall down together with the crimped portion 12c. By bending, the upper end of the gasket is interposed between the upper surface of the flange portion 13a and the crimped portion 12c.
- the gasket 14 may have a wall portion 14a extending in the thickness direction of the sealing plate 13 in a state of being laid down together with the crimped portion 12c at the tip portion of the upper end of the cylindrical portion. This wall facilitates electrical insulation between the crimped portion 12 c and the sealing plate 13 .
- the wall portion 14a may be close to and in contact with the side surface of the raised portion 13b projecting upward from the flange portion 13a from the caulked portion 12c. With this configuration, the crimped portion 12c can extend radially inward of the battery. As a result, when the crimped portion 12c is used as the connection point, the area that can be connected to the current collecting member can be expanded.
- the upper end of the wall portion 14a in contact with the side surface of the raised portion 13b may be higher than the upper end of the sealing plate 13 in the thickness direction.
- the lead 15 electrically connects the first electrode of the electrode group 11 and the sealing plate.
- Leads 15 are constructed of a conductive material. Materials for the leads 15 include, for example, aluminum, copper, nickel, iron, titanium, or alloys of these metals.
- the lead 15 is ribbon-shaped, and one end of the lead 15 is connected to a portion of the first electrode where the composite material layer is not formed. The other end is joined to the bottom surface of the central portion 13 e of the sealing plate 13 .
- FIG. 6A is a perspective cross-sectional view showing a modification of the power storage device 10.
- FIG. 6B is a perspective cross-sectional view showing another modification of power storage device 10.
- FIG. In FIGS. 6A and 6B hatching applied to the cut surface of power storage device 10 is omitted for ease of viewing.
- a modified example of the power storage device 10 has a gasket 44 instead of the gasket 14 .
- the wall portion 44a of the gasket 44 is in common with the wall portion 14a in that the wall portion 44a is in contact with the side surface of the raised portion 13b. However, a part of the wall portion 44a may be separated from the sealing plate 13 .
- FIG. 6B another modification of the power storage device 10 has a gasket 54 instead of the gasket 14 .
- a wall portion 54a at the tip of the gasket 54 is arranged to cover the tip of the caulked portion 12c. Thereby, the sealing plate 13 and the crimped portion 12c can be insulated more reliably.
- the sealing plate of the present disclosure and the power storage device using the same have improved reliability as a sealing plate. Therefore, charging/discharging by a power storage device with higher performance and charging/discharging in a more severe environment are possible. Therefore, the sealing plate of the present disclosure and the power storage device using the same can be used in a wide range of fields such as power sources for electronic devices and drive power sources for driving bodies.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
(実施の形態)
以下に図面を用いながら、本開示の実施の形態における封口板およびそれを用いた蓄電装置を説明する。なお、以下の実施の形態では、蓄電装置の一例としてリチウムイオン二次電池のような非水二次電池の構成に基づいて説明を行う。しかしながら本開示の蓄電装置は、上記電池に限定されない。本開示の蓄電装置は、アルカリ蓄電池や、キャパシタなどであってもよい。
再び、図1、2を用いて蓄電装置10の構成を説明する。
11 電極群
12 外装体
12a 筒部
12b 開口部
12c かしめ部
12d 溝部
13、23、33 封口板
13a フランジ部
13b 隆起部
13c 脆弱部
13d、23d、33d 中継部
13e、23e、33e 中央部
13f、23f、33f 斜面
14、44、54 ガスケット
14a、44a、54a 壁部
15 リード
16 絶縁板
Claims (9)
- 蓄電装置に用いられる封口板であって、
前記封口板は、
外周縁に設けられた環状のフランジ部と、
前記フランジ部より中心側に位置し、前記フランジ部より厚い環状の隆起部と、
前記隆起部より中心側に位置し、前記封口板において最も薄い脆弱部と、
前記脆弱部より中心側に位置する、環状の中継部と、
前記中継部より中心側に位置し、前記封口板の中心を含む中央部とを備え、
前記封口板の厚さ方向において、前記厚さ方向と平行な第1方向に、前記脆弱部が、前記フランジ部から離れており、
前記中継部は、前記厚さ方向において前記第1方向と反対方向である第2方向に突出した、
封口板。 - 前記第1方向が封口板の上方であり、前記第2方向が封口板の下方であり、
前記中継部の下面が突出した斜面を有し、
前記隆起部は、前記フランジ部の上面から上方に突出し、
前記脆弱部は、前記フランジ部より上に位置し、
前記中継部の斜面は、前記中継部の下面に形成され、
前記中継部は、脆弱部側より中央部側の方が厚い、
請求項1に記載の封口板。 - 前記径方向から見て、前記中継部の前記斜面はフランジ部と重なる、
請求項2に記載の封口板。 - 前記中継部の上面が平坦面であり、
前記脆弱部の上面と前記隆起部の上面と前記中継部の上面は面一である、
請求項2に記載の封口板。 - 前記封口板において、前記中央部が最も厚い、
請求項1~4のうちいずれか1項に記載の封口板。 - 第1電極と第2電極を含む電極群と、
前記電極群を収容する外装体と
前記外装体の開口部を絶縁性のガスケットを介して塞ぐ封口板とを備え、
前記封口板は、請求項1~5のうちいずれか1項に記載の封口板であり、
前記第1電極は、前記封口板と電気的に接続し、
前記第2電極は、前記外装体と電気的に接続する、
蓄電装置。 - 前記外装体は、内部に前記電極群を収容する筒部と、前記筒部の一端を塞ぐ底部と、前記筒部の他端に設けられた前記開口部とを有し、
前記筒部は、前記筒部の内周面が前記径方向に突出するように外周面が環状に窪んだ溝部を有し、
前記ガスケットは、筒状であるとともに、前記封口板の前記フランジ部の上面、下面、および前記フランジ部の上面と下面とを繋ぐ外周面を覆い、
前記封口板が筒状のガスケットを介して前記溝部の内周面上に設けられ、
前記外装体の前記開口部は、前記中心に向かって倒れて前記ガスケットを介して前記フランジ部の上面と当接するかしめ部を有する、
請求項6に記載の蓄電装置。 - 前記封口板の前記隆起部は、前記フランジ部の上面から上に向かって突出し、
前記フランジ部の上面を覆う前記ガスケットは、前記かしめ部より前記隆起部の近くまで延びるとともに、前記隆起部の外側面と当接する環状の壁部を備える、
請求項7に記載の蓄電装置。 - 前記壁部の上端は、前記封口板の上端よりも上に位置する、
請求項8に記載の蓄電装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN202280021547.2A CN117063340A (zh) | 2021-03-18 | 2022-03-14 | 封口板以及利用该封口板的蓄电装置 |
JP2023507094A JPWO2022196623A1 (ja) | 2021-03-18 | 2022-03-14 | |
EP22771369.0A EP4310872A1 (en) | 2021-03-18 | 2022-03-14 | Sealing plate and power storage device using same |
US18/549,189 US20240162539A1 (en) | 2021-03-18 | 2022-03-14 | Sealing plate and power storage device using same |
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JP2021-044228 | 2021-03-18 | ||
JP2021044228 | 2021-03-18 |
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WO2022196623A1 true WO2022196623A1 (ja) | 2022-09-22 |
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PCT/JP2022/011259 WO2022196623A1 (ja) | 2021-03-18 | 2022-03-14 | 封口板およびそれを用いた蓄電装置 |
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US (1) | US20240162539A1 (ja) |
EP (1) | EP4310872A1 (ja) |
JP (1) | JPWO2022196623A1 (ja) |
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WO (1) | WO2022196623A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0362377B2 (ja) | 1986-09-05 | 1991-09-25 | Oshikiri Machinery | |
JPH10172523A (ja) * | 1996-10-07 | 1998-06-26 | Haibaru:Kk | 非水系円筒形電池 |
JPH10233199A (ja) * | 1997-02-20 | 1998-09-02 | Toshiba Battery Co Ltd | 非水電解液電池 |
WO2016157750A1 (ja) * | 2015-03-27 | 2016-10-06 | 三洋電機株式会社 | 円筒形電池 |
-
2022
- 2022-03-14 WO PCT/JP2022/011259 patent/WO2022196623A1/ja active Application Filing
- 2022-03-14 CN CN202280021547.2A patent/CN117063340A/zh active Pending
- 2022-03-14 JP JP2023507094A patent/JPWO2022196623A1/ja active Pending
- 2022-03-14 EP EP22771369.0A patent/EP4310872A1/en active Pending
- 2022-03-14 US US18/549,189 patent/US20240162539A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0362377B2 (ja) | 1986-09-05 | 1991-09-25 | Oshikiri Machinery | |
JPH10172523A (ja) * | 1996-10-07 | 1998-06-26 | Haibaru:Kk | 非水系円筒形電池 |
JPH10233199A (ja) * | 1997-02-20 | 1998-09-02 | Toshiba Battery Co Ltd | 非水電解液電池 |
WO2016157750A1 (ja) * | 2015-03-27 | 2016-10-06 | 三洋電機株式会社 | 円筒形電池 |
Also Published As
Publication number | Publication date |
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CN117063340A (zh) | 2023-11-14 |
JPWO2022196623A1 (ja) | 2022-09-22 |
US20240162539A1 (en) | 2024-05-16 |
EP4310872A1 (en) | 2024-01-24 |
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