WO2017115856A1 - 封止部材、蓄電素子及び蓄電素子の製造方法 - Google Patents
封止部材、蓄電素子及び蓄電素子の製造方法 Download PDFInfo
- Publication number
- WO2017115856A1 WO2017115856A1 PCT/JP2016/089143 JP2016089143W WO2017115856A1 WO 2017115856 A1 WO2017115856 A1 WO 2017115856A1 JP 2016089143 W JP2016089143 W JP 2016089143W WO 2017115856 A1 WO2017115856 A1 WO 2017115856A1
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- WIPO (PCT)
- Prior art keywords
- protrusion
- protrusions
- terminal
- sealing member
- positive electrode
- Prior art date
Links
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- 238000003860 storage Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 230000005611 electricity Effects 0.000 title abstract description 12
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- 238000007906 compression Methods 0.000 claims description 30
- 238000012986 modification Methods 0.000 description 32
- 230000004048 modification Effects 0.000 description 32
- -1 LiMPO 4 Chemical class 0.000 description 6
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- 239000007788 liquid Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000007773 negative electrode material Substances 0.000 description 5
- 239000007774 positive electrode material Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000011255 nonaqueous electrolyte Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
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- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 description 3
- 229920002530 polyetherether ketone Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910011157 LiMBO Inorganic materials 0.000 description 1
- 229910015118 LiMO Inorganic materials 0.000 description 1
- 229910013275 LiMPO Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- ZVLDJSZFKQJMKD-UHFFFAOYSA-N [Li].[Si] Chemical compound [Li].[Si] ZVLDJSZFKQJMKD-UHFFFAOYSA-N 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910021469 graphitizable carbon Inorganic materials 0.000 description 1
- JWZCKIBZGMIRSW-UHFFFAOYSA-N lead lithium Chemical compound [Li].[Pb] JWZCKIBZGMIRSW-UHFFFAOYSA-N 0.000 description 1
- 235000013490 limbo Nutrition 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 229910021450 lithium metal oxide Inorganic materials 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- UIDWHMKSOZZDAV-UHFFFAOYSA-N lithium tin Chemical compound [Li].[Sn] UIDWHMKSOZZDAV-UHFFFAOYSA-N 0.000 description 1
- 229910021437 lithium-transition metal oxide Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910021470 non-graphitizable carbon Inorganic materials 0.000 description 1
- 229920011301 perfluoro alkoxyl alkane Polymers 0.000 description 1
- 229920000447 polyanionic polymer Polymers 0.000 description 1
- 229920000137 polyphosphoric acid Chemical class 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Images
Classifications
-
- 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
-
- 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
- H01G11/74—Terminals, e.g. extensions of current collectors
-
- 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
- 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
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
-
- 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
- H01G9/0029—Processes of manufacture
-
- 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
- H01G9/008—Terminals
-
- 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
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- 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
-
- 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
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- 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
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- 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
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- 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 invention relates to a terminal provided in a container or a current collector electrically connected to the terminal, a sealing member disposed between the container, a power storage element including the sealing member, and a method for manufacturing the same. .
- an electrode body is accommodated in a container, and a terminal electrically connected to the electrode body is provided exposed from the container.
- a sealing member is interposed between the container and the terminal, and the sealing member ensures airtightness around the terminal and improves the quality of the power storage element itself (for example, see Patent Document 1).
- an object of the present invention is to improve the quality of the storage element.
- a sealing member is disposed between a terminal provided in a container of a power storage element or a current collector electrically connected to the terminal and the container.
- a first surface facing the container, and a second surface opposite to the first surface and facing the terminal or current collector, the first surface having a shaft of the terminal A first protrusion is formed to surround the portion, and a second protrusion is formed on the second surface to surround the shaft portion of the terminal. The amount of protrusion of the first protrusion and the protrusion of the second protrusion The amount is different.
- the quality of the storage element can be improved.
- FIG. 1 is a perspective view schematically showing the external appearance of the energy storage device according to the first embodiment.
- FIG. 2 is a perspective view showing each component included in the power storage element by separating the container body of the container of the power storage element according to the embodiment.
- FIG. 3 is a cross-sectional view showing a schematic configuration of the fixing structure according to the first embodiment.
- FIG. 4 is a cross-sectional view showing a state before the shaft portion of the positive electrode terminal according to the first embodiment is caulked.
- FIG. 5 is a bottom view of the positive electrode first sealing member corresponding to FIG. 4.
- FIG. 6 is an enlarged cross-sectional view illustrating two first protrusions and two second protrusions according to the first modification.
- FIG. 7 is a cross-sectional view showing another relationship between the protrusion amounts of the two first protrusions and the two second protrusions.
- FIG. 8 is a cross-sectional view illustrating a schematic configuration of a positive electrode second sealing member according to Modification 2.
- FIG. 9 is an enlarged cross-sectional view illustrating a peripheral portion of the first protrusion according to the third modification.
- FIG. 10 is a cross-sectional view illustrating a state before the shaft portion of the positive electrode terminal according to the second embodiment is caulked.
- FIG. 11 is an enlarged cross-sectional view showing two first protrusions and two second protrusions according to Modification 4.
- FIG. 12 is a cross-sectional view illustrating a schematic configuration of a positive electrode second sealing member according to Modification 5.
- a sealing member is disposed between a terminal provided in a container of a power storage element or a current collector electrically connected to the terminal and the container.
- a first surface facing the container, and a second surface opposite to the first surface and facing the terminal or current collector, the first surface having a shaft of the terminal A first protrusion is formed to surround the portion, and a second protrusion is formed on the second surface to surround the shaft portion of the terminal. The amount of protrusion of the first protrusion and the protrusion of the second protrusion The amount is different.
- the protrusion amounts of the first protrusion provided on the first surface of the sealing member and the second protrusion provided on the second surface are different, the first protrusion Compared with the case where the second protrusion and the second protrusion have the same protrusion amount, the quality of the power storage element itself can be improved.
- the protrusion amount of the first protrusion may be larger than the protrusion amount of the second protrusion.
- the protrusion amount of the first protrusion is larger than the protrusion amount of the second protrusion, it is possible to increase the collapse of the first protrusion. Therefore, the adhesion between the compressed first protrusion and the container can be enhanced after the sealing member is compressed. Furthermore, since the crushing white is large, airtightness can be maintained over a long period of time.
- a plurality of the first protrusions may be provided, and the shaft portion of the terminal may be enclosed in multiples.
- the airtightness on the container side can be improved.
- the amount of protrusion of each of the plurality of first protrusions may increase as the distance from the shaft portion of the terminal increases.
- the sealing member When the sealing member is compressed between the terminal or the current collector and the container, there is a characteristic that the compressive force increases as the shaft portion of the terminal is closer. That is, even if the protrusion amount of the first protrusion is small near the shaft portion of the terminal, the first protrusion can be compressed to the extent that airtightness can be exhibited. In other words, if the amount of protrusion of the plurality of first protrusions is increased as the distance from the shaft portion of the terminal increases, it is possible to compress the first protrusion so that sufficient airtightness can be exhibited by any of the first protrusions. is there.
- a plurality of the second protrusions may be provided, and the shaft portion of the terminal may be enclosed in multiples.
- the amount of protrusion of each of the plurality of second protrusions may be increased as the distance from the shaft portion of the terminal increases.
- the sealing member When the sealing member is compressed between the terminal or the current collector and the container, there is a characteristic that the compressive force increases as the shaft portion of the terminal is closer. That is, even if the amount of protrusion of the second protrusion is small near the shaft portion of the terminal, the second protrusion can be compressed to such an extent that airtightness can be exhibited. In other words, if the amount of protrusion of the plurality of second protrusions is increased as the distance from the shaft portion of the terminal increases, it is possible to compress the second protrusions to such an extent that sufficient airtightness can be exhibited by any of the second protrusions. is there.
- a plurality of second protrusions are provided, and the shaft portions of the terminals are surrounded in multiples.
- the protrusion amounts of the plurality of first protrusions and the plurality of second protrusions are the plurality of second protrusions in the compressed state. The larger the stress acting on each of the one protrusion and each of the plurality of second protrusions, the smaller may be determined.
- the plurality of first protrusions and the plurality of second protrusions surround the terminal shaft portion in a multiple manner, the airtightness of the container and the terminal or the current collector side can be improved.
- a plurality of first protrusions are provided to surround the shaft portion of the terminal in a multiplex manner
- a plurality of second protrusions are provided to surround the shaft portion of the terminal in a multiplex manner.
- At least one protrusion amount may be larger than at least one protrusion amount of the plurality of second protrusions.
- At least one protrusion amount of the plurality of first protrusions is larger than at least one protrusion amount of the plurality of second protrusions, it is possible to increase the collapse of at least one first protrusion.
- the protrusion amount of another 1st protrusion may be smaller than the protrusion amount of a 2nd protrusion, the freedom degree of design can be raised.
- the larger the stress acting on each of the plurality of first protrusions and the plurality of second protrusions in the compressed state the larger the protrusion of each of the plurality of first protrusions and the plurality of second protrusions.
- the amount is determined small. Thereby, it can compress to such an extent that sufficient airtightness can be exhibited in each of the plurality of first protrusions and the plurality of second protrusions.
- first protrusion and the second protrusion may be arranged at a position overlapping in plan view of the first surface.
- first protrusion and the second protrusion are arranged at a position where they overlap in a plan view, the force acting on the first protrusion and the second protrusion during compression can be evenly applied in a plan view. . Therefore, stability after compression can be improved.
- the protrusion amount of the first protrusion may be smaller than the protrusion amount of the second protrusion.
- the first protrusion compressed by the container tends to be less crushed than the second protrusion compressed by the terminal or the current collector. For this reason, by making the protrusion amount of the first protrusion smaller than the protrusion amount of the second protrusion, the first protrusion is easily compressed as a whole, and the flatness of the first surface after compression is ensured. be able to. Thus, if the 1st surface of the sealing member after compression can be made flat, the container which touches the 1st surface can be held flat.
- the first protrusion and the second protrusion The protrusion is arranged in a state where the sealing member is compressed between the terminal or the current collector and the container, and the protrusion amount of the first protrusion and the protrusion of the second protrusion in the state before compression. The amount is different.
- the protrusion amounts of the first protrusion provided on the first surface of the sealing member and the second protrusion provided on the second surface are different, the first protrusion Compared with the case where the second protrusion and the second protrusion have the same protrusion amount, the quality of the power storage element itself can be improved.
- a method for manufacturing a power storage device wherein the sealing member is disposed between a terminal or a current collector and a container, and the first protrusion The part and the second protrusion are compressed.
- FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to the present embodiment.
- FIG. 2 is a perspective view showing each component included in power storage element 10 by separating container body 111 of container 100 of power storage element 10 according to the present embodiment.
- the Z-axis direction is shown as the up-down direction, and in the following description, the Z-axis direction may be described as the up-down direction. For this reason, the Z-axis direction is not limited to the vertical direction. The same applies to the subsequent drawings.
- the electricity storage element 10 is a secondary battery that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
- the electrical storage element 10 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.
- the power storage element 10 may be a primary battery.
- the storage element 10 includes a container 100, a positive electrode terminal 200 and a negative electrode terminal 201, a positive electrode current collector 120 and a negative electrode current collector 130, a positive electrode first sealing member 150, and a negative electrode.
- a first sealing member 160 and an electrode body 140 are provided.
- a liquid such as an electrolytic solution (non-aqueous electrolyte) is sealed inside the container 100 of the electricity storage element 10, the liquid is not shown.
- an electrolytic solution non-aqueous electrolyte
- the container 100 includes a container main body 111 having a rectangular cylindrical shape and a bottom, and a lid 110 that is a plate-like member that closes the opening of the container main body 111.
- the container 100 can be sealed by welding the lid body 110 and the container body 111 after the positive electrode current collector 120, the negative electrode current collector 130, the electrode body 140, and the like are accommodated therein. It is possible.
- the material of the lid 110 and the container body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate.
- the electrode body 140 is a power storage element (power generation element) that includes a positive electrode, a negative electrode, and a separator and can store electricity.
- a positive electrode active material layer is formed on a positive electrode base material foil which is a long strip-shaped metal foil made of aluminum or an aluminum alloy.
- the negative electrode is obtained by forming a negative electrode active material layer on a negative electrode base foil that is a long strip-shaped metal foil made of copper, copper alloy, aluminum, aluminum alloy, or the like.
- the separator is a microporous sheet made of resin.
- the positive electrode active material used for the positive electrode active material layer or the negative electrode active material used for the negative electrode active material layer may be a known material as long as it is a positive electrode active material or a negative electrode active material capable of occluding and releasing lithium ions. Can be used.
- the positive electrode active material examples include polyanion compounds such as LiMPO 4 , LiMSiO 4 , LiMBO 3 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), titanium, and the like.
- polyanion compounds such as LiMPO 4 , LiMSiO 4 , LiMBO 3 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), titanium, and the like.
- spinel compounds such as lithium oxide and lithium manganate, lithium transition metal oxides such as LiMO 2 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), etc. Can do.
- the negative electrode active material examples include lithium metal, lithium alloy (lithium metal such as lithium-aluminum, lithium-silicon, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloy). Alloys), alloys capable of inserting and extracting lithium, carbon materials (eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon, etc.), metal oxides, lithium metal oxides ( Li 4 Ti 5 O 12 etc.), polyphosphoric acid compounds and the like.
- lithium metal lithium alloy
- lithium metal such as lithium-aluminum, lithium-silicon, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloy. Alloys), alloys capable of inserting and extracting lithium, carbon materials (eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined
- the electrode body 140 is formed by winding a layered arrangement so that a separator is sandwiched between the negative electrode and the positive electrode, and is electrically connected to the positive electrode current collector 120 and the negative electrode current collector 130.
- the electrode body 140 has an oval cross section, but may be circular or elliptical.
- the shape of the electrode body 140 is not limited to the wound type, and may be a laminated type in which flat plate plates are laminated.
- the positive electrode terminal 200 is an external terminal that is disposed outside the container 100 and is electrically connected to the positive electrode of the electrode body 140.
- the negative electrode terminal 201 is an external terminal that is disposed outside the container 100 and is electrically connected to the negative electrode of the electrode body 140.
- the positive electrode terminal 200 and the negative electrode terminal 201 lead the electricity stored in the electrode body 140 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 140, It is a conductive electrode terminal for introducing.
- the positive electrode terminal 200 and the negative electrode terminal 201 are attached to the lid body 110 via the positive electrode first sealing member 150 and the negative electrode first sealing member 160.
- the positive electrode current collector 120 and the negative electrode current collector 130 are disposed on the inner side of the container 100, that is, on the inner surface (the surface on the negative side in the Z-axis direction) of the lid 110.
- the positive electrode current collector 120 is disposed between the positive electrode of the electrode body 140 and the side wall of the container body 111, and is electrically connected to the positive electrode terminal 200 and the positive electrode of the electrode body 140. It is a member provided with rigidity.
- the negative electrode current collector 130 is disposed between the negative electrode of the electrode body 140 and the side wall of the container body 111, and has conductivity and rigidity electrically connected to the negative electrode terminal 201 and the negative electrode of the electrode body 140. It is a member.
- the positive electrode current collector 120 is formed of aluminum or an aluminum alloy as in the case of the positive electrode base material foil of the electrode body 140.
- the negative electrode current collector 130 is formed of copper, a copper alloy, or the like, like the negative electrode base foil of the electrode body 140.
- the positive electrode first sealing member 150 and the negative electrode first sealing member 160 are gaskets at least partially disposed between the positive electrode terminal 200 and the negative electrode terminal 201 and the lid 110.
- the positive electrode first sealing member 150 has a recess 151 whose upper side is open, and the positive electrode terminal 200 is accommodated in the recess 151.
- the negative electrode first sealing member 160 has a recess 161 whose upper side is open, and the negative electrode terminal 201 is accommodated in the recess 161.
- the positive electrode terminal 200 and the negative electrode terminal 201 are attached to the lid body 110 with a part thereof exposed.
- This fixing structure is substantially the same as the fixing structure in which the negative electrode terminal 201 is fixed to the lid 110 together with the negative electrode current collector 130 via the negative electrode first sealing member 160, and therefore the description on the negative electrode side is omitted. .
- the positive electrode terminal 200 is attached to the lid 110 while being accommodated in the positive electrode first sealing member 150, and the positive electrode second sealing member 170 is further attached to the positive electrode first sealing member 150. These are fixed integrally by attaching the positive electrode current collector 120.
- the lid body 110 is formed with a through hole 112 into which a part of the positive electrode first sealing member 150 in a state where the positive electrode terminal 200 is accommodated is inserted.
- a positioning projection 113 for positioning the positive electrode second sealing member 170 is provided on the lower surface of the lid 110 in a shape corresponding to the outer shape of the positive electrode second sealing member 170.
- the positive electrode second sealing member 170 is a gasket in which at least a part thereof is disposed between the positive electrode current collector 120 and the lid body 110.
- the positive electrode second sealing member 170 is preferably formed of an insulating member having lower rigidity than the lid 110.
- the positive electrode second sealing member 170 includes, for example, polyphenylene sulfide (PPS), polypropylene (PP), polyethylene (PE), polybutylene terephthalate (PBT), polytetrafluoroethylene (PFA), polyether ether ketone (PEEK), and the like. Made of resin.
- a concave portion 171 for accommodating the current collector main body 121 of the positive electrode current collector 120 is formed on the bottom surface of the positive electrode second sealing member 170.
- a through hole 172 having the same shape as the through hole 112 of the lid 110 is formed in the recess 171.
- the through hole 172 is disposed so as to be continuous with the through hole 112 of the lid 110, and the cylindrical portion 152 of the positive electrode first sealing member 150 is inserted into the through holes 172 and 112.
- the positive electrode current collector 120 integrally includes a current collector main body 121 and an electrode body connecting portion 122.
- the current collector main body 121 is a part to which the positive electrode terminal 200 is connected. Specifically, the current collector main body 121 is formed in a flat plate shape and has a through hole 123 into which the shaft portion 220 of the positive electrode terminal 200 is inserted.
- the electrode body connecting portion 122 is two long legs that are electrically connected to the positive electrode of the electrode body 140.
- the electrode body connection part 122 is arranged outward (X-axis direction minus side) from the through hole 123 of the current collector main body part 121.
- the electrode body connection part 122 is fixed to the positive electrode in a state where the positive electrode of the electrode body 140 is sandwiched in the Y-axis direction (see FIG. 2).
- the positive electrode terminal 200 is integrally provided with a bus bar connection part 210 and a shaft part 220.
- the bus bar connection part 210 is a part to which a bus bar (not shown) connecting the electrode terminals of the electricity storage element 10 is connected, and the upper surface is formed in a plane.
- the shaft part 220 is a part extending downward from the lower surface of the bus bar connection part 210, and the tip part 230 is caulked so that the positive electrode first sealing member 150 and the positive electrode second sealing are applied to the lid 110.
- the member 170 and the positive electrode current collector 120 are fixed.
- the tip portion 230 of the shaft portion 220 is annular and is in close contact with the surface of the current collector main body 121.
- the distal end portion 230 and the bus bar connecting portion 210 connect the current collector body 121 of the positive electrode current collector 120, the positive electrode first sealing member 150, the positive electrode second sealing member 170, and the lid 110. Tightened in the Z-axis direction.
- the positive electrode first sealing member 150 is integrally provided with a terminal accommodating portion 153 and a cylindrical portion 152.
- the terminal accommodating portion 153 is formed with a recess 151 that accommodates the bus bar connecting portion 210 of the positive electrode terminal 200.
- the cylindrical portion 152 protrudes in a cylindrical shape from the lower surface of the terminal accommodating portion 153 downward.
- the through hole 154 of the cylindrical portion 152 has the same shape as the through hole 123 of the positive electrode current collector 120.
- the through hole 154 is disposed so as to be continuous with the through hole 123 of the positive electrode current collector 120, and the shaft portion 220 of the positive electrode terminal 200 is inserted into the through holes 154 and 123.
- the outer diameter of the cylindrical portion 152 is formed so as to be inserted into the through holes 172 and 112.
- the positive electrode first sealing member 150 as a whole is preferably made of an insulating member having lower rigidity than the lid 110.
- the positive electrode first sealing member 150 is formed of a resin such as PPS, PP, PE, PBT, PFA, and PEEK, for example.
- FIG. 4 is a cross-sectional view showing a state before the shaft portion 220 of the positive electrode terminal 200 according to the present embodiment is caulked.
- FIG. 5 is a bottom view of the positive electrode first sealing member 150 corresponding to FIG.
- the tip portion is not deformed, and the shaft portion 220 as a whole has a cylindrical shape.
- the bottom surface 153 a outside the terminal accommodating portion 153 in the positive electrode first sealing member 150 is a first surface facing the lid 110 that is a part of the container 100.
- Two first protrusions 155a and 155b surrounding the shaft portion 220 of the positive electrode terminal 200 are formed on the bottom surface 153a.
- the two first protrusions 155 a and 155 b are each a semi-elliptical protrusion in a sectional view, and are formed in an annular shape centering on the axial center of the cylindrical portion 152.
- the first protrusion 155 a is disposed on the side close to the shaft part 220, and the first protrusion 155 b is disposed on the side far from the shaft part 220. Further, the protrusion amounts H1 of the two first protrusions 155a and 155b are the same.
- the protrusion amount H1 is the height from the base end to the tip end of the first protrusions 155a and 155b.
- the bottom surface 153 b inside the terminal accommodating portion 153 in the positive electrode first sealing member 150 is a second surface facing the bus bar connecting portion 210 of the positive electrode terminal 200 on the side opposite to the bottom surface 153 a that is the first surface.
- Two second protrusions 156a and 156b surrounding the shaft portion 220 of the positive electrode terminal 200 are formed on the bottom surface 153b.
- each of the two second protrusions 156 a and 156 b is a protrusion having a semicircular shape in cross section, and is formed in an annular shape centering on the axial center of the cylindrical portion 152.
- the protrusion amount H2 of the two second protrusions 156a and 156b is the same.
- the protrusion amount H2 is the height from the proximal end to the distal end of the second protrusions 156a and 156b.
- the protrusion amount H1 of the first protrusions 155a and 155b is set larger than the protrusion amount H2 of the second protrusions 156a and 156b.
- the crushing white of the 1st protrusion 155a, 155b after compression can be made larger than the crushing white of the 2nd protrusion 156a, 156b.
- first protrusions 155a and 155b and the second protrusions 156a and 156b may have any cross-sectional shape as long as they protrude.
- examples of other cross-sectional shapes include polygonal shapes such as a triangle and a quadrangle.
- first protrusions 155a and 155b and the second protrusions 156a and 156b are preferably continuous annular as a whole, but the outer appearance may be generally annular. Specifically, the first protrusions 155a and 155b and the second protrusions 156a and 156b may have gaps intermittently in the circumferential direction.
- the cylindrical portion 152 of the positive electrode first sealing member 150 is inserted into the through hole 112 of the lid 110.
- the shaft portion 220 of the positive electrode terminal 200 is inserted into the through hole 154 of the positive electrode first sealing member 150.
- the cylindrical portion 152 of the positive electrode first sealing member 150 is inserted into the through hole 172 of the positive electrode second sealing member 170, and then the shaft portion 220 of the positive electrode terminal 200 is inserted into the through hole 123 of the positive electrode current collector 120. Insert.
- the positive electrode of the electrode body 140 is attached to the positive electrode current collector 120, and the negative electrode of the electrode body 140 is attached to the negative electrode current collector 130.
- the protrusion amount H1 of the first protrusions 155a and 155b is larger than the protrusion amount H2 of the second protrusions 156a and 156b, the first protrusions 155a and 155b are crushed. White can be enlarged. Therefore, after the positive electrode first sealing member 150 is compressed, the adhesion between the compressed first protrusions 155a and 155b and the lid 110 can be enhanced. Furthermore, since the crushing white is large, airtightness can be maintained over a long period of time.
- the quality of the power storage element 10 can be improved.
- first protrusions 155a and 155b and the second protrusions 156a and 156b are arranged in a position overlapping in plan view, the first protrusions 155a and 155b and the second protrusions 156a and 156b and The force acting on can be equally applied in a plan view. Therefore, stability after compression can be improved.
- Modification 1 Next, Modification 1 according to the first embodiment will be described. In the following description, parts corresponding to those of the first embodiment may be denoted by the same reference numerals and description thereof may be omitted.
- the case where the plurality of first protrusions 155a and 155b have the same protrusion amount H1 and the plurality of second protrusions 156a and 156b have the same protrusion amount H2 is exemplified.
- the protrusion amounts of the first protrusions 155a and 155b or the second protrusions 156a and 156b may be different.
- FIG. 6 is an enlarged cross-sectional view showing two first protrusions 155a and 155b and two second protrusions 156a and 156b according to Modification 1.
- FIG. 6 shows a state before compression.
- the protrusion amounts H3 and H4 of the two first protrusions 155a and 155b are set to increase as the distance from the shaft portion 220 of the positive electrode terminal 200 increases.
- the closer to the shaft portion 220 of the positive electrode terminal 200 the greater the compression force. That is, near the shaft portion 220 of the positive electrode terminal 200, even if the projection amount of the first protrusion 155a is small, the first protrusion 155a can be compressed to the extent that airtightness can be exhibited.
- the protrusion amounts H3 and H4 of the two first protrusions 155a and 155b are increased with increasing distance from the shaft part 220 of the positive electrode terminal 200, even one of the first protrusions 155a and 155b is sufficiently airtight. It is possible to compress to such an extent that it can exhibit its properties.
- the protrusion amount H3 of the first protrusion 155a and the protrusion amount H6 of the second protrusion 156b may be the same. That is, the relationship between the protrusion amounts is preferably H4> H3 ⁇ H6> H5, but at least the protrusion amount H4 of the first protrusion 155b on the outer side is the largest, and the second protrusion 156a on the inner side. As long as the protrusion amount H5 is the smallest.
- each protrusion amount is an example. That is, it is sufficient that at least one protrusion amount H3, H4 of the plurality of first protrusions 155a, 155b is larger than at least one protrusion amount H5, H6 of the plurality of second protrusions 156a, 156b. Furthermore, it is preferable that at least one of the plurality of first protrusions 155a and 155b has a larger protrusion amount than the one having the largest protrusion amount among the plurality of second protrusions 156a and 156b.
- FIG. 7 is a cross-sectional view showing another relationship between the protrusion amounts of the two first protrusions and the two second protrusions.
- the relationship between the protrusion amounts is H3> H5> H4> H6.
- the protrusion amount of the other 1st protrusion part 155b may be smaller than the protrusion amount of the 2nd protrusion part 156a, the freedom degree of design can be raised.
- the protrusion amounts of the first protrusions and the second protrusions are set larger as the distance from the shaft portion 220 of the positive electrode terminal 200 increases. It only has to be.
- the amount of protrusion of each of the plurality of first protrusions and the plurality of second protrusions is the stress acting on each of the plurality of first protrusions and the plurality of second protrusions in the compressed state.
- Modification 2 Next, Modification 2 according to the first embodiment will be described.
- 1st Embodiment the case where the 1st protrusion part 155a, 155b and the 2nd protrusion part 156a, 156b were provided in the positive electrode 1st sealing member 150 was illustrated.
- Modification 2 a case where the first protrusion and the second protrusion are provided on the positive electrode second sealing member will be described as an example.
- FIG. 8 is a cross-sectional view showing a schematic configuration of a positive electrode second sealing member according to Modification 2. Specifically, FIG. 8 is a diagram corresponding to FIG.
- the positive electrode first sealing member 150B is formed of a single resin as a whole, and the outer bottom surface 153c as the first surface and the inner bottom surface 153d as the second surface are flat. Is formed. That is, the positive electrode first sealing member 150B in Modification 2 does not include the first protrusions 155a and 155b and the second protrusions 156a and 156b.
- the outer upper surface 173 a of the positive electrode second sealing member 170 ⁇ / b> B is a first surface facing the lid 110.
- two first protrusions 174a and 174b surrounding the shaft portion 220 of the positive electrode terminal 200 are formed.
- the two first protrusions 174 a and 174 b are each a semi-elliptical protrusion in a sectional view, and are formed in an annular shape centering on the axial center of the cylindrical portion 152.
- the first protrusion 174 a is disposed on the side close to the shaft part 220, and the first protrusion 174 b is disposed on the side far from the shaft part 220.
- the protrusion amounts H11 of the two first protrusions 174a and 174b are the same.
- the upper surface 173b in the recess 171 in the positive electrode second sealing member 170B is a second surface opposite to the upper surface 173a and facing the positive electrode current collector 120.
- Two second protrusions 175a and 175b surrounding the shaft portion 220 of the positive electrode terminal 200 are formed on the upper surface 173b.
- the two second protrusions 175 a and 175 b are each a semicircular protrusion in cross-sectional view, and are formed in an annular shape centering on the axial center of the cylindrical portion 152.
- the second protrusion 175 a is disposed on the side closer to the shaft part 220, and the second protrusion 175 b is disposed on the side far from the shaft part 220.
- the first protrusion 174a and the second protrusion 175a are disposed at the overlapping positions
- the first protrusion 174b and the second protrusion 175b are disposed at the overlapping positions.
- the protrusion amounts H12 of the two second protrusions 175a and 175b are the same.
- the protrusion amount H11 of the first protrusions 174a and 174b is set larger than the protrusion amount H12 of the second protrusions 175a and 175b.
- the first protrusions 174a and 174b and the second protrusions 175a and 175b are compressed by caulking the shaft part 220 of the positive electrode terminal 200, respectively, so that the first protrusions 174a and 174b after compression are compressed.
- the positive electrode 1st sealing member which does not have 1st protrusion part 155a, 155b and 2nd protrusion part 156a, 156b, without using the positive electrode 1st sealing member 150 which concerns on the said 1st Embodiment,
- the positive electrode second sealing member 170B When the positive electrode second sealing member 170B is used at the same time, the positive electrode current collector 120 and the positive electrode terminal 200 may be welded to ensure airtightness.
- FIG. 9 is an enlarged cross-sectional view of the peripheral portion of the first protrusion 155a according to Modification 3. Although only the first protrusion 155a is shown here, the peripheral structure is the same in the first protrusion 155b and the second protrusions 156a and 156b.
- grooves 191 and 192 are formed inside and outside the first protrusion 155a, respectively.
- the grooves 191 and 192 have a semicircular cross-sectional shape and are formed over the entire circumference of the annular first protrusion 155a.
- the base of the first protrusion 155a is the bottom of the grooves 191 and 192.
- the protrusion amount H21 of the first protrusion 155a is a portion shown in FIG.
- the protrusion amount after compression is 0.03 mm. If the periphery of the first protrusion 155a is a flat surface, the first protrusion 155a compressed to 0.03 mm remains, which affects the flatness of the lid 110.
- the cover body 110 can be arrange
- the depth D1 of the grooves 191 and 192 is desirably set to a depth that can absorb the amount of protrusion of the first protrusion 155a after compression. For example, as described above, when the protruding amount after compression is 0.03 mm, the depth D1 of the groove portions 191 and 192 is made deeper than 0.03 mm.
- the storage element 10 is illustrated in which the airtightness is improved by making the protrusion amount H1 of the first protrusions 155a and 155b larger than the protrusion amount H2 of the second protrusions 156a and 156b. did.
- This 2nd Embodiment demonstrates the structure which can raise the flatness of the positive electrode terminal and a container with respect to the sealing member (positive electrode 1st sealing member and positive electrode 2nd sealing member) after compression.
- portions corresponding to those of the first embodiment may be denoted by the same reference numerals and description thereof may be omitted.
- FIG. 10 is a cross-sectional view illustrating a state before the shaft portion 220 of the positive electrode terminal 200 according to the present embodiment is caulked. Specifically, FIG. 10 corresponds to FIG.
- the fixing structure according to the present embodiment has substantially the same structure as that of the first embodiment, and the different parts are the protrusion amount H31 of the first protrusions 157a and 157b, This is a relationship with the protrusion amount H32 of the second protrusions 158a and 158b. That is, in the present embodiment, the protrusion amount H31 of the first protrusions 157a and 157b is made smaller than the protrusion amount H32 of the second protrusions 158a and 158b.
- the first protrusions 157a and 157b compressed by the lid 110 tend to be less crushed than the second protrusions 158a and 158b compressed by the positive electrode terminal 200. Therefore, by making the protrusion amount H31 of the first protrusions 157a and 157b smaller than the protrusion amount H32 of the second protrusions 158a and 158b, the first protrusions 157a and 157b can be easily compressed as a whole, and the compression is performed. The flatness of the rear bottom surface 153a can be ensured. Thus, if the bottom surface 153a of the positive electrode first sealing member 150C after compression can be flattened, the lid body 110 in contact with the bottom surface 153a can be held flat.
- the quality of the power storage element 10 can be improved.
- Modification 4 Next, Modification 4 according to the second embodiment will be described.
- portions corresponding to those of the second embodiment may be denoted by the same reference numerals and description thereof may be omitted.
- the case where the plurality of first protrusions 157a and 157b have the same protrusion amount H31 and the plurality of second protrusions 158a and 158b have the same protrusion amount H32 is exemplified.
- the protrusion amounts of the first protrusions 157a and 157b or the second protrusions 158a and 158b may be made different in order to further increase the flatness.
- FIG. 11 is an enlarged cross-sectional view showing two first protrusions 157a and 157b and two second protrusions 158a and 158b according to Modification 4.
- FIG. 11 shows a state before compression.
- the protrusion amounts H33 and H34 of the two first protrusions 157a and 157b are set to decrease as the distance from the shaft part 220 of the positive electrode terminal 200 increases.
- the positive electrode first sealing member 150 is compressed between the positive electrode terminal 200 and the lid body 110, there is a characteristic that the compressive force increases as the shaft portion 220 of the positive electrode terminal 200 is closer. That is, even if the first protrusions 157a and 157b having the same protrusion amount H32 are provided, the compression amount of the first protrusion 157a on the side closer to the shaft part 220 is large, and the compression of the first protrusion 157b on the far side is large.
- the protrusion amounts H33 and H34 of the two first protrusions 157a and 157b are reduced as they move away from the shaft portion 220 of the positive electrode terminal 200, thereby suppressing variation in the protrusion amount after compression.
- the flatness of the lid 110 with respect to the first sealing member 150 is ensured.
- the protrusion amounts H35 and H36 of the two second protrusions 158a and 158b are also set to be smaller as the distance from the shaft part 220 of the positive electrode terminal 200 increases. Therefore, since the variation of the protrusion amount after compression of the two 2nd protrusion parts 158a and 158b is suppressed, the flatness of the positive electrode terminal 200 with respect to the positive electrode 1st sealing member 150 is ensured.
- the protrusion amount H33 of the first protrusion 157a and the protrusion amount H36 of the second protrusion 158b may be the same. That is, the relationship between the protrusion amounts is preferably H35> H36 ⁇ H33> H34, but at least the protrusion amount H34 of the first protrusion 157b on the outer side is the smallest and the second protrusion 158a on the inner side. As long as the protrusion amount H35 is the largest.
- the protrusion amounts of the first protrusions and the second protrusions are set smaller as the distance from the shaft part 220 of the positive electrode terminal 200 increases. It only has to be.
- Modification Example 5 Modification Example 5 according to the second embodiment will be described.
- the case where the 1st protrusion 157a, 157b and the 2nd protrusion 158a, 158b were provided in 150 C of positive electrode 1st sealing members was illustrated.
- this modified example 5 a case where the first protrusion and the second protrusion are provided on the positive electrode second sealing member will be described as an example.
- FIG. 12 is a cross-sectional view showing a schematic configuration of a positive electrode second sealing member according to Modification 5. Specifically, FIG. 12 corresponds to FIG.
- the modified example 5 has substantially the same structure as that of the modified example 2.
- the different parts are the protrusion amount H41 of the first protrusions 176a and 176b and the second protrusions 177a and 177b. This is the relationship with the protrusion amount H42. That is, in the modified example 5, the protrusion amount H41 of the first protrusions 176a and 176b is made smaller than the protrusion amount H42 of the second protrusions 177a and 177b.
- portions corresponding to the modification 2 may be denoted by the same reference numerals and description thereof may be omitted.
- the protrusion amount H41 of the two first protrusions 176a and 176b is the same, and the protrusion amount H42 of the two second protrusions 177a and 177b is the same.
- the protrusion amount H41 of the first protrusions 176a and 176b is set to be smaller than the protrusion amount H42 of the second protrusions 177a and 177b.
- the power storage element 10 includes one electrode body 140, but a configuration including a plurality of electrode bodies may be used.
- the positive electrode terminal 200 with which the bus-bar connection part 210 and the axial part 220 were integrally molded was illustrated, a bus-bar connection part and an axial part are separate bodies, Comprising: The positive electrode terminal integrated may be sufficient.
- the positive electrode side is illustrated as an example to describe the specific configuration of the characteristic feature of the present invention.
- the same configuration is of course applied to the negative electrode side.
- the structure from which the positive electrode side and a negative electrode side differ may be sufficient.
- the present invention can be applied to power storage elements such as lithium ion secondary batteries.
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Abstract
Description
まず、蓄電素子10の構成について、説明する。
次に、第1の実施の形態に係る変形例1について説明する。なお、以下の説明において、第1の実施の形態に対応する部分については同一の符号を付してその説明を省略する場合がある。
次に、第1の実施の形態に係る変形例2について説明する。第1の実施の形態では、正極第1封止部材150に第1突部155a,155bと第2突部156a,156bとが設けられている場合を例示した。この変形例2では、正極第2封止部材に第1突部と第2突部とが設けられている場合を例示して説明する。
第1の実施の形態では、各第1突部155a,155bと各第2突部156a,156bの周囲が平面である場合を例示した。この変形例3では、各第1突部155a,155bと、第2突部156a,156bとのそれぞれの周囲に、環状の溝部が形成されている場合を例示して説明する。
第1の実施の形態では、第1突部155a,155bの突出量H1を、第2突部156a,156bの突出量H2よりも大きくすることで、気密性を向上させた蓄電素子10を例示した。この第2の実施の形態では、圧縮後の封止部材(正極第1封止部材及び正極第2封止部材)に対する正極端子と容器との平坦度を高めることのできる構造について説明する。なお、この第2の実施の形態においても、第1の実施の形態に対応する部分においては、同一の符号を付してその説明を省略する場合がある。
次に、第2の実施の形態に係る変形例4について説明する。なお、以下の説明において、第2の実施の形態に対応する部分については同一の符号を付してその説明を省略する場合がある。
次に、第2の実施の形態に係る変形例5について説明する。第2の実施の形態では、正極第1封止部材150Cに第1突部157a,157bと第2突部158a,158bとが設けられている場合を例示した。この変形例5では、正極第2封止部材に第1突部と第2突部とが設けられている場合を例示して説明する。
以上、本発明の実施の形態及びその変形例に係る封止部材、蓄電素子などについて説明したが、本発明は、上記実施の形態及びその変形例に限定されるものではない。つまり、今回開示された実施の形態及びその変形例は全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて請求の範囲によって示され、請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。
100 容器
110 蓋体
111 容器本体
112,123,154,172 貫通孔
113 突起
120 正極集電体(集電体)
121 集電体本体部
122 電極体接続部
130 負極集電体
140 電極体
150,150B,150C 正極第1封止部材(封止部材)
151,161,171 凹部
152 円筒部
153 端子収容部
153a,153c 底面(第1面)
153b,153d 底面(第2面)
155a,155b,157a,157b,174a,174b,176a,176b 第1突部
156a,156b,158a,158b,175a,175b,177a,177b 第2突部
160 負極第1封止部材
170,170B 正極第2封止部材
173a,173b 上面
191,192 溝部
200 正極端子(端子)
201 負極端子
210 バスバー接続部
220 軸部
230 先端部
H1,H2,H3,H4,H5,H6,H11,H12,H21,H31,H32,H33,H34,H35,H36,H41,H42 突出量
Claims (12)
- 蓄電素子の容器に設けられた端子又は前記端子に電気的に接続される集電体と、前記容器との間に配置された封止部材であって、
前記容器に対向する第1面と、
前記第1面とは反対側で、前記端子又は前記集電体に対向する第2面とを備え、
前記第1面には、前記端子の軸部を囲む第1突部が形成されており、
前記第2面には、前記端子の軸部を囲む第2突部が形成されており、
前記第1突部の突出量と、前記第2突部の突出量とが異なる
封止部材。 - 前記第1突部の突出量は、前記第2突部の突出量よりも大きい
請求項1に記載の封止部材。 - 前記第1突部は、複数設けられ、前記端子の軸部を多重で囲む
請求項2に記載の封止部材。 - 複数の前記第1突部のそれぞれの突出量は、前記端子の軸部から離れるほど大きい
請求項3に記載の封止部材。 - 前記第2突部は、複数設けられ、前記端子の軸部を多重で囲む
請求項1~4のいずれか一項に記載の封止部材。 - 複数の前記第2突部のそれぞれの突出量は、前記端子の軸部から離れるほど大きい
請求項5に記載の封止部材。 - 前記第1突部は、複数設けられ、前記端子の軸部を多重で囲むとともに、
前記第2突部は、複数設けられ、前記端子の軸部を多重で囲んでおり、
複数の前記第1突部の少なくとも1つの突出量は、複数の前記第2突部の少なくとも1つの突出量よりも大きい
請求項1に記載の封止部材。 - 前記第2突部は、複数設けられ、前記端子の軸部を多重に囲み、
複数の前記第1突部と複数の前記第2突部とのそれぞれの突出量は、圧縮された状態における複数の前記第1突部と、複数の前記第2突部とのそれぞれに作用する応力が大きいほど、小さく決定されている
請求項3に記載の封止部材。 - 前記第1突部と、前記第2突部とは、前記第1面の平面視で重なる位置に配置されている
請求項1~8のいずれか一項に記載の封止部材。 - 前記第1突部の突出量は、前記第2突部の突出量よりも小さい
請求項1に記載の封止部材。 - 容器に設けられた端子と、前記端子に電気的に接続される集電体とを備える蓄電素子であって、
前記端子又は前記集電体と前記容器との間に配置された封止部材を備え、
前記封止部材は、
前記容器に対向する第1面と、
前記第1面とは反対側で、前記端子又は前記集電体に対向する第2面とを備え、
前記第1面には、前記端子の軸部を囲む第1突部が形成されており、
前記第2面には、前記端子の軸部を囲む第2突部が形成されており、
前記第1突部と、前記第2突部とは、前記封止部材が前記端子又は前記集電体と前記容器との間で圧縮された状態で配置されており、
圧縮前の状態における前記第1突部の突出量と、前記第2突部の突出量とが異なる
蓄電素子。 - 請求項1~10のいずれか一項に記載の封止部材を、前記端子又は前記集電体と前記容器との間に配置して、前記端子又は前記集電体と前記容器とにより、前記第1突部と前記第2突部とを圧縮する
蓄電素子の製造方法。
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