WO2014002847A1 - 電池用封止部材 - Google Patents
電池用封止部材 Download PDFInfo
- Publication number
- WO2014002847A1 WO2014002847A1 PCT/JP2013/066853 JP2013066853W WO2014002847A1 WO 2014002847 A1 WO2014002847 A1 WO 2014002847A1 JP 2013066853 W JP2013066853 W JP 2013066853W WO 2014002847 A1 WO2014002847 A1 WO 2014002847A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery
- gasket
- crystallinity
- case lid
- insulating
- Prior art date
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 55
- 238000003780 insertion Methods 0.000 claims abstract description 91
- 230000037431 insertion Effects 0.000 claims abstract description 91
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 5
- 239000000057 synthetic resin Substances 0.000 claims abstract description 5
- 239000003792 electrolyte Substances 0.000 claims description 20
- 238000010248 power generation Methods 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 15
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 30
- 239000000463 material Substances 0.000 description 18
- 238000002844 melting Methods 0.000 description 17
- 230000008018 melting Effects 0.000 description 17
- 239000000203 mixture Substances 0.000 description 17
- 239000000047 product Substances 0.000 description 17
- 238000009413 insulation Methods 0.000 description 16
- 239000008151 electrolyte solution Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 10
- 230000006835 compression Effects 0.000 description 9
- 238000007906 compression Methods 0.000 description 9
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- 238000004519 manufacturing process Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- -1 steam Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229920001780 ECTFE Polymers 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
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- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 235000012438 extruded product Nutrition 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—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
- H01M50/186—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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—Organic material
-
- 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
- H01M50/19—Sealing members characterised by the material
- H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
-
- 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
-
- 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
- H01M50/562—Terminals characterised by the material
-
- 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 is used in a battery including an electrode terminal member that is electrically connected to a power generation element inside a case lid member and extends to the outside through the case lid member.
- the present invention relates to a battery sealing member that seals between a lid member.
- batteries such as lithium ion secondary batteries have been used in various fields such as electronic devices such as mobile phones and personal computers, vehicles such as hybrid cars and electric cars.
- a lithium ion secondary battery has a high energy density and is suitable for mounting in various devices.
- a lithium ion secondary battery is configured as follows, for example.
- a lithium ion secondary battery includes a positive electrode foil coated with a positive electrode active material, a negative electrode foil coated with a negative electrode active material, and a flat power generation element in which a separator for insulating them is wound.
- the power generation element is accommodated in a case body member having an opening. The opening of the case body member is closed by a case lid member welded to the case body member.
- An electrode terminal member is electrically connected to the power generation element.
- the electrode terminal member is electrically connected to the power generation element, and is also electrically connected to the element connection terminal that penetrates the case lid member to the outside and the element connection terminal outside the case lid member. External connection terminals.
- the case lid member is provided with a liquid injection port, and an electrolytic solution is injected from the liquid injection port. After injection of the electrolytic solution, the injection port is closed with an injection plug.
- the injection stopper is sealed and welded to the case lid member by laser welding.
- a sealing member made of a synthetic resin is provided between the element connection terminal of the electrode terminal member and the case lid member for sealing.
- a lithium ion secondary battery described in Patent Document 1 is known.
- the element connection terminals (the positive current collector plate 14 and the positive connection terminal 15 in Patent Document 1) are used as case cover members.
- An insertion portion (shaft portion 15a in Patent Literature 1) that is inserted into a through-hole drilled in (the lid 11 in Patent Literature 1) and protrudes to the outside of the case lid member, and a flat plate having a diameter larger than that of the insertion portion Part (head 15f in Patent Document 1).
- the element connection terminal is inserted into the through hole of the case lid member with the gasket fitted in the insertion portion. That is, an insertion hole (through hole 10a in Patent Document 1) is formed in the gasket, and the element connection terminal inserts the insertion part into the insertion hole and inserts the insertion part from the lower surface side of the case lid member to the case. It penetrates through the through hole of the lid member.
- an external insulating member (insulating member 12 in Patent Document 1) and an external connection terminal (positive electrode external terminal 13 in Patent Document 1) are further inserted into the insertion portion exposed to the outside of the case lid member.
- each member is fastened and fixed to the case lid member by caulking the tip of the insertion portion by so-called rotary caulking.
- the gasket is pressed against the inner surface of the case lid member by the flat plate portion.
- the element connection terminal and the gasket are in surface contact with no gap, and the case lid member and the gasket are in surface contact with no gap. Therefore, the gap between the element connection terminal and the case lid member is sealed, and the electrolyte in the case body member is prevented from leaking outside the case lid member.
- the degree of crystallinity refers to the ratio of the crystalline part to the whole polymer individual in the polymer individual composed of the crystalline part and the amorphous part. If the crystallinity of the gasket is high, the free volume in the gasket is small, so the electrolyte molecules cannot penetrate into the gasket, and even if it penetrates, the rate of diffusion through the gasket is slow. On the other hand, when the crystallinity of the gasket is low, the free volume in the gasket is large, so that electrolyte molecules can enter the gasket and diffuse at a high rate.
- the free volume of the gasket means the total volume of the gasket minus the volume occupied by the molecules present in the volume. That is, a region where molecules can enter.
- the electrolyte may permeate into the gasket and leak out of the case lid member through the gasket.
- batteries mounted on vehicles are subject to abrupt changes in operating environment temperature. For this reason, when the operating environment temperature rises, the crystallinity of the gasket that has received heat decreases, and there is a high risk that the electrolyte will penetrate into the gasket.
- the present invention has been made to solve the above problems. That is, the problem is to provide a battery sealing member that can suitably prevent the electrolyte from leaking outside the case lid member.
- the battery sealing member according to one aspect of the present invention which has been made for the purpose of solving this problem, includes a power generation element, a case main body member having an opening and containing the power generation element together with an electrolyte, and a case main body member Used in a battery comprising a case lid member that closes the opening, and an electrode terminal member that has an insertion portion that is inserted through a through-hole provided in the case lid member and is electrically connected to the power generation element.
- a battery sealing member comprising a resin and having a seal portion sandwiched between an electrode terminal member and an inner surface of a case lid member, wherein the crystallinity of the seal portion is higher than the crystallinity other than the seal portion. It is expensive.
- the “seal portion” is a portion that receives a compressive force by being sandwiched between the electrode terminal member and the inner surface of the case lid member.
- the “power generation element” for example, a wound-type power generation element in which a positive electrode, a negative electrode, and a separator each having a long shape are stacked and wound, or a large number of positive electrodes, negative electrodes, and separators each having a predetermined shape are stacked. And the like.
- the density of the seal portion is high because the crystallinity of the seal portion is high. For this reason, molecules constituting the electrolytic solution are difficult to permeate through the seal portion. Therefore, it is possible to prevent the electrolytic solution from leaking out of the battery through the inside of the sealing member.
- the crystallinity of the seal portion is 40% or more. This is because if the crystallinity of the seal portion is 40% or more, the electrolyte can be suitably prevented from leaking from the battery.
- the battery sealing member having the above structure has an insertion hole through which the insertion portion is inserted, and is located on the inner side near the insertion hole as viewed from the seal portion, and surrounds the inner edge portion and the inner edge portion. It consists of a seal part and an outer edge part that is located outside the inner edge part as viewed from the seal part and surrounds the seal part.
- the seal part has a higher degree of crystallinity than the inner edge part and the outer edge part. desirable.
- the seal portion having a high degree of crystallinity is located between the inner edge portion and the outer edge portion having a low crystallinity degree.
- the crystalline portion in the seal portion tends to change to amorphous, so that the seal portion tends to expand accordingly.
- the inner edge and the outer edge which have a lower degree of crystallinity than the seal part, appear to have already expanded compared to the seal part. Therefore, there is no room to accept the expansion of the seal part.
- the force of the seal portion to expand acts on the inner edge portion and the outer edge portion, the force does not shrink the inner edge portion and the outer edge portion. Therefore, expansion of the seal portion is suppressed. Therefore, according to the battery sealing member having the above-described configuration, it is possible to prevent the crystallinity of the seal portion from being lowered and maintain the crystallinity of the seal portion at a higher value than the inner edge portion and the outer edge portion. Therefore, the favorable sealing performance by the battery sealing member can be maintained.
- the battery sealing member having the above-described configuration it is desirable that at least a part of the inner edge portion is inserted through the through hole of the case lid member together with the insertion portion. With such a configuration, since the through hole of the case lid member can be closed by the inner edge portion of the battery sealing member, the sealability between the case lid member and the electrode terminal member can be improved.
- the battery sealing member having the above-described configuration includes a flat plate portion that sandwiches the seal portion between the inner surface of the case lid member as an electrode terminal member, and the insertion portion extends vertically from one main surface of the flat plate portion.
- the outer edge portion surrounds a peripheral side surface that is continuous with one main surface of the flat plate portion.
- the battery sealing member can be fitted to the electrode terminal member so that the outer edge of the battery sealing member surrounds the peripheral side surface of the flat plate portion of the electrode terminal member. It is easy to position the sealing member for assembly with respect to the electrode terminal member during assembly.
- a battery sealing member that can suitably prevent the electrolyte from leaking outside the case lid member.
- FIG. 1 is a cross-sectional view of a battery 100 according to the embodiment.
- FIG. 2 is an enlarged view of a portion B and a portion C in FIG.
- symbol is written in FIG.
- FIG. 3 is an exploded perspective view of a part of the lid member with terminal 115 according to the embodiment.
- the top, bottom, left, and right refer to FIG. 1, and the front side of the page in FIG. 1 is the front and the back side of the page is the back.
- the battery 100 includes a rectangular box-shaped battery case main body (an example of a case main body member) 111 having an opening 111 d, and electrodes accommodated in the battery case main body 111.
- the battery 100 further includes a plate-shaped battery case lid (an example of a case lid member) 113 that closes the opening 111d of the battery case body 111.
- the battery case main body 111 and the battery case lid 113 are integrated by welding to constitute the battery case 110.
- the battery case 110 is made of metal (specifically, pure aluminum).
- the battery 100 is a prismatic battery mounted on a vehicle such as a hybrid car or an electric vehicle, or a battery using device such as a hammer drill.
- the battery case lid 113 has a rectangular plate shape, and circular through holes 113h and 113k penetrating the battery case lid 113 are formed at both ends in the longitudinal direction (left and right direction in FIG. 1).
- a safety valve 113j is provided at the center of the battery case lid 113 in the longitudinal direction.
- the safety valve 113j is formed integrally with the battery case lid 113 and forms a part of the battery case lid 113.
- the safety valve 113j is formed thinner than the other part of the battery case cover 113, and a groove 113jv is formed on the upper surface thereof (see FIG. 3). As a result, the safety valve 113j operates when the internal pressure inside the battery case 110 reaches a predetermined pressure. That is, when the internal pressure reaches a predetermined pressure, the groove 113jv breaks, and the gas inside the battery case 110 is released to the outside.
- a liquid injection port 113n for injecting an electrolyte (not shown) into the battery case 110 is formed between the safety valve 113j and the through hole 113k of the battery case lid 113 (see FIG. 1).
- the liquid injection port 113n is sealed with a liquid injection plug 113m.
- the battery 100 is connected to the electrode body 150 inside the battery case main body 111 and is extended to the outside through the through holes 113h and 113k of the battery case lid 113 (positive terminal member 130 and negative terminal member 140). ).
- the positive electrode terminal member 130 includes a positive electrode connection member (element connection terminal) 135, a positive electrode external terminal member (external connection terminal) 137, and a positive electrode fastening member (bolt) 139 (see FIGS. 1 and 3).
- the positive electrode connection member 135 is made of metal (pure aluminum), is connected to the electrode body 150, and extends to the outside through the through hole 113 h of the battery case lid 113.
- the positive electrode external terminal member 137 is made of metal, is located on the battery case lid 113 (outside of the battery case 110), and is electrically connected to the positive electrode connection member 135 outside the battery case 110.
- the positive electrode fastening member 139 is made of metal, is located on the battery case lid 113 (outside of the battery case 110), and is electrically connected to the positive electrode external terminal member 137.
- the positive electrode connection member 135 includes a pedestal portion (which is an example of a flat plate portion) 131, an insertion portion 132, an electrode body connection portion 134, and a caulking portion 133 (see FIGS. 1 to 3).
- the pedestal 131 has a rectangular plate shape and is located inside the battery case main body 111.
- the insertion portion 132 has a cylindrical shape protruding from the upper surface (an example of one main surface) 131f of the pedestal portion 131, and is inserted through the through hole 113h of the battery case lid 113.
- the caulking portion 133 is a portion connected to the upper end of the insertion portion 132, is caulked (deformed so as to be expanded in diameter), has a disk shape, and is electrically connected to the positive electrode external terminal member 137. .
- the electrode body connecting portion 134 is welded to the positive electrode mixture layer uncoated portion 151 b of the electrode body 150 in a form extending from the lower surface 131 b of the pedestal portion 131 to the bottom surface 111 b side of the battery case main body 111. Thereby, the positive electrode connection member 135 and the electrode body 150 are electrically and mechanically connected.
- the positive external terminal member 137 is made of a metal plate and has a substantially Z shape in side view.
- the positive external terminal member 137 includes a fixing portion 137f fixed by the crimping portion 133, a connecting portion 137g connected to the positive electrode fastening member 139, and a connecting portion 137h connecting the fixing portion 137f and the connecting portion 137g. ing.
- a through hole 137b is formed in the fixing portion 137f, and the insertion portion 132 of the positive electrode connection member 135 is inserted into the through hole 137b.
- the connecting portion 137g is also formed with a through hole 137c penetrating therethrough.
- the positive electrode fastening member 139 is a metal bolt and has a rectangular plate-shaped head portion 139b and a columnar shaft portion 139c. A portion on the tip side of the shaft portion 139c is a screw portion 139d. The shaft portion 139c of the positive electrode fastening member 139 passes through the through hole 137c of the positive electrode external terminal member 137.
- the negative electrode terminal member 140 includes a negative electrode connection member (element connection terminal) 145, a negative electrode external terminal member (external connection terminal) 147, and a negative electrode fastening member (bolt) 149 (see FIGS. 1 and 3).
- the negative electrode connection member 145 is made of metal (pure copper), is connected to the electrode body 150, and extends to the outside through the through hole 113 k of the battery case lid 113.
- the negative external terminal member 147 is made of metal, is located on the battery case lid 113 (outside the battery case 110), and is electrically connected to the negative electrode connection member 145 outside the battery case 110.
- the negative electrode fastening member 149 is made of metal, is located on the battery case lid 113 (outside of the battery case 110), and is electrically connected to the negative electrode external terminal member 147.
- the negative electrode connection member 145 includes a pedestal portion (which is an example of a flat plate portion) 141, an insertion portion 142, an electrode body connection portion 144, and a caulking portion 143 (see FIGS. 1 to 3).
- the pedestal portion 141 has a rectangular plate shape and is located inside the battery case body 111.
- the insertion part 142 has a cylindrical shape protruding from the upper surface (an example of one main surface) 141f of the pedestal part 141, and is inserted through the through hole 113k of the battery case lid 113.
- the caulking portion 143 is a portion connected to the upper end of the insertion portion 142, is caulked (deformed so as to be expanded in diameter), has a disk shape, and is electrically connected to the negative external terminal member 147. .
- the electrode body connecting portion 144 is welded to the negative electrode mixture layer uncoated portion 158b of the electrode body 150 in a form extending from the lower surface 141b of the pedestal portion 141 toward the bottom surface 111b of the battery case body 111. Thereby, the negative electrode connection member 145 and the electrode body 150 are electrically and mechanically connected.
- the negative electrode fastening member 149 is a metal bolt, and has a rectangular plate-shaped head portion 149b and a columnar shaft portion 149c. A portion on the tip side of the shaft portion 149c is a screw portion 149d. The shaft portion 149 c of the negative electrode fastening member 149 is inserted through the through hole 147 c of the negative electrode external terminal member 147.
- the battery 100 is interposed between the positive electrode terminal member 130 (specifically, the positive electrode connecting member 135) and the battery case lid 113, and electrically insulates the first insulating member (battery sealing member). 170, which is an example).
- the first insulating member 170 is also interposed between the negative electrode terminal member 140 (specifically, the negative electrode connecting member 145) and the battery case lid 113.
- the first insulating member 170 is a gasket made of an electrically insulating resin (specifically, PFA).
- the first insulating member 170 (hereinafter also referred to as “gasket 170”) includes an insulating interposition part (an example of a seal part) 171, an insulating side wall part (an example of an outer edge part) 173, and an insertion part (an inner edge part). (See FIG. 2 and FIG. 3).
- the insulation interposition part 171 has a flat plate shape, and the upper surface 131f (upper surface 141f) of the pedestal portion 131 (pedestal portion 141) of the positive electrode terminal member 130 (negative electrode terminal member 140) and the lower surface (inner surface) of the battery case lid 113. 113b.
- the insulating side wall part 173 is a square annular side wall part located on the outer peripheral edge of the insulating interposition part 171.
- the insulating side wall portion 173 surrounds the outer peripheral side surface 131g (outer peripheral side surface 141g) of the pedestal portion 131 (pedestal portion 141). With such a configuration, since the upper surface 131f (upper surface 141f) side of the pedestal portion 131 (pedestal portion 141) is received inside the lower surface side of the first insulating member 170, the pedestal portion 131 (pedestal portion of the first insulating member 170). 141) is restricted.
- the insulating side wall portion 173 is also referred to as an outer burring portion.
- the insertion portion 175 is a cylindrical portion located at the inner peripheral edge (center portion in a top view) of the insulating interposed portion 171, protrudes upward from the upper surface 171 f of the insulating interposed portion 171, and passes through the through hole 113 h of the battery case lid 113. It is inserted through (through hole 113k).
- An insertion hole 175a through which the insertion portion 132 of the positive electrode terminal member 130 (the insertion portion 142 of the negative electrode terminal member 140) is inserted is formed in the cylinder of the insertion portion 175.
- the insertion portion 175 is also referred to as an inner burring portion.
- the first insulating member 170 will be described in detail later.
- the battery 100 is made of an electrically insulating resin (specifically, 100% PPS), and includes a second insulating member (external insulating member) 180 disposed on the battery case lid 113.
- the second insulating member 180 is interposed between the positive electrode terminal member 130 (specifically, the positive electrode external terminal member 137 and the positive electrode fastening member 139) and the battery case lid 113, and electrically insulates both.
- the second insulating member 180 is also interposed between the negative electrode terminal member 140 (specifically, the negative electrode external terminal member 147 and the negative electrode fastening member 149) and the battery case lid 113.
- the second insulating member 180 is also referred to as an insulator.
- the second insulating member 180 includes a head arrangement portion 181 where the head portion 139b of the positive electrode fastening member 139 (the head portion 149b of the negative electrode fastening member 149) is arranged, and a fixing portion 137f of the positive electrode external terminal member 137. And a fastening arrangement portion 183 in which the (fixing portion 147f of the negative electrode external terminal member 147) is arranged.
- the fastening arrangement portion 183 is formed with a through hole 183b penetrating therethrough, and the insertion portion 132 of the positive electrode terminal member 130 (the insertion portion 142 of the negative electrode terminal member 140) is inserted into the through hole 183b. Yes.
- the battery case lid 113, the electrode terminal members (the positive terminal member 130 and the negative terminal member 140), the first insulating members 170 and 170, and the second insulating members 180 and 180 are used as a lid member with a terminal.
- 115 is configured. Specifically, the positive external terminal member 137, the second insulating member 180, the battery case lid 113, and the first insulating member 170 are sandwiched between the crimped portion 133 and the pedestal portion 131 of the positive electrode terminal member 130.
- the negative electrode external terminal member 147, the second insulating member 180, the battery case lid 113, and the first insulating member 170 are sandwiched between the crimped portion 143 and the base portion 141 of the negative electrode terminal member 140.
- the terminal-attached lid member 115 in which these are integrated is formed.
- the insulation interposition part 171 of the first insulating member 170 includes the upper surface 131f (upper surface 141f) of the pedestal portion 131 (pedestal portion 141) of the positive electrode terminal member 130 (negative electrode terminal member 140) and the battery case. It is sandwiched between the lower surface (inner surface) 113b of the lid 113 and is elastically compressed and arranged in its own thickness direction (axial direction indicated by AX in FIG. 2). Further, the insertion portion 175 of the first insulating member 170 is elastically compressed in its own axial direction (the axial direction indicated by AX in FIG. 2), and its tip 175b is in close contact with the second insulating member 180. . In this manner, the through holes 113h and 113k of the battery case lid 113 are sealed by the first insulating member 170.
- the through-holes 113 h and 113 k of the battery case lid 113 are formed downward from the lower surface (inner surface) 113 b of the battery case lid 113.
- a convex portion 113p protruding in a cylindrical shape is formed.
- the convex portion 113p bites into a position near the insertion portion 175 of the upper surface 171f of the insulating intermediate portion 171.
- the first insulating member 170 is pressed between the convex portion 113p and the upper surface 131f (upper surface 141f) of the pedestal portion 131 (pedestal portion 141) of the positive electrode terminal member 130 (negative electrode terminal member 140).
- a compression part 171p is formed.
- the high compression portion 171p is a portion having the highest sealing performance in the first insulating member 170.
- the electrode body 150 is a flat wound electrode body obtained by winding a belt-like positive electrode plate 155, a negative electrode plate 156, and a separator 157 into a flat shape.
- the positive electrode plate 155 has a strip shape extending in the longitudinal direction DA, and includes a positive electrode base material 151 made of an aluminum foil, and a positive electrode mixture layer 152 disposed on a part of the surface of the positive electrode base material 151. have.
- the positive electrode mixture layer 152 includes a positive electrode active material 153, a conductive material made of acetylene black, and PVDF (binder).
- the positive electrode base material 151 a portion where the positive electrode mixture layer 152 is coated is referred to as a positive electrode mixture layer coating portion 151c.
- a portion where the positive electrode mixture layer 152 is not coated is referred to as a positive electrode mixture layer uncoated portion 151b.
- the positive electrode mixture layer uncoated portion 151b is located at the end portion (left end portion in FIG. 6) of the positive electrode base material 151 (positive electrode plate 155) in the width direction DB (left and right direction in FIG. 6).
- the positive electrode base material 151 (positive electrode plate 155) extends in a strip shape in the longitudinal direction DA.
- the negative electrode plate 156 has a strip shape extending in the longitudinal direction DA, a negative electrode base material 158 made of copper foil, and a negative electrode mixture layer disposed on a part of the surface of the negative electrode base material 158. 159.
- the negative electrode mixture layer 159 includes a negative electrode active material 154, SBR (binder), and CMC (thickening agent).
- the portion of the negative electrode base material 158 where the negative electrode mixture layer 159 is coated is referred to as a negative electrode mixture layer coating portion 158c.
- a portion of the negative electrode base material 158 where the negative electrode mixture layer 159 is not coated is referred to as a negative electrode mixture layer uncoated portion 158b.
- the negative electrode mixture layer uncoated portion 158b is located at the end (right end in FIG. 7) of the negative electrode base 158 (positive plate 156) in the width direction DB (left and right in FIG. 7).
- the negative electrode base material 158 (negative electrode plate 156) extends in a strip shape in the longitudinal direction DA (vertical direction in FIG. 7).
- the first insulating member 170 includes an insertion portion 175 located on the inner side near the insertion hole 175a, an insulating side wall portion 173 located on the outer side away from the insertion hole 175a, and a space between the insertion portion 175 and the insulating side wall portion 173. And an insulating interposition part 171 located at (see FIGS. 2 and 8).
- FIG. 9 is a graph showing the crystallinity of the first insulating member 170 (gasket 170).
- the horizontal axes a, b, and c correspond to the portions a, b, and c attached to the gasket 170 in FIG. That is, a in FIG. 9 indicates the crystallinity of the insulating intermediate portion 171 of the gasket 170, b in FIG. 9 indicates the crystallinity of the insertion portion 175 of the gasket 170, and c in FIG.
- the crystallinity of the insulating side wall part 173 is shown.
- the degree of crystallinity is the ratio of the crystalline part in the whole. If the degree of crystallinity is low, the free volume of the portion is large, and therefore the electrolyte molecules injected into the battery case 110 may enter the gasket 170, and in this case, the rate of diffusion in the gasket. Is fast. On the other hand, if the degree of crystallinity is high, the free volume of the portion is small, so that it becomes difficult for molecules of the electrolyte injected into the battery case 110 to enter the gasket 170. The rate of diffusion in the gasket is slow.
- the degree of crystallinity of the insulating interposition part 171 is higher than the degree of crystallinity of the insertion part 175 and the insulating side wall part 173. Specifically, the crystallinity of the insulating interposition part 171 is about 43%, the crystallinity of the insertion part 175 is about 33%, and the crystallinity of the insulating side wall part 173 is about 34%. That is, in the gasket 170 of the embodiment, the degree of crystallinity of the insulating interposition part 171 is about 10% higher than the degree of crystallinity of the other parts (the insertion part 175 and the insulating side wall part 173).
- the insulating interposed portion 171 is sandwiched between the lower surface (inner surface) 113b of the battery case lid 113 and the upper surface 131f of the pedestal portion 131 of the positive electrode terminal member 130. It is.
- the gasket 170 has the best sealing performance at the portion where the surface pressure is most applied. From this point, the insulating interposition part 171 is also referred to as a seal part 171. It can be said that the gasket 170 of the embodiment has a higher degree of crystallinity of the seal portion 171 having the highest surface pressure than that of other portions.
- the measurement of crystallinity shown as an example in FIG. 9 was performed by measuring a sample of about 10 mg of gasket 170 using a DSC analyzer.
- a DSC analyzer a suggested scanning calorimeter Thermo plus EVO DSC8120 manufactured by Rigaku was used.
- the measurement atmosphere was air.
- the measurement temperature was increased from room temperature to 350 ° C. at a rate of 10 ° C./min.
- the crystallinity is calculated by the following formula (1).
- Crystallinity (%) (X / Y) ⁇ 100 (1)
- X Melting enthalpy (measured heat of fusion)
- Y Complete melting enthalpy (complete crystal melting heat)
- the melting enthalpy (measured heat of fusion) X is the amount of heat measured using a DSC analyzer.
- the complete melting enthalpy (complete crystal melting heat quantity) Y is the heat quantity of melting of an ideal perfect crystal free from lattice defects and impurities.
- the complete melting enthalpy (complete crystal melting heat amount) Y is a value uniquely determined according to the material of the gasket 170.
- FIG. 10 shows the case where the gasket 170 shown as an example in FIG. 9 (the gasket 170 of the embodiment) is used, and the comparative example in FIG. 10 is different from the gasket 170 of the embodiment.
- the case where a gasket is used is shown.
- the gasket used in the comparative example is a gasket having a crystallinity shown in FIG. 9 as a comparative example.
- the gasket of the comparative example is a gasket having a crystallinity of about 33% in the insulation intervening portion, a crystallinity of about 31% in the insertion portion, and a crystallinity of about 32% in the insulating sidewall. That is, in the gasket of the comparative example, the crystallinity of each part of the insulating interposition part, the insertion part, and the insulating side wall part is almost the same value.
- the gasket of the comparative example is manufactured by injection molding.
- the measuring method of the crystallinity degree of the gasket of the comparative example shown in FIG. 9 is the same as the measuring method about the above-mentioned Example.
- FIG. 10 is a graph showing the electrolyte permeation amount when the battery is left at a temperature of 80 ° C.
- the horizontal axis represents time (unit: h), and the vertical axis represents the electrolyte permeation amount (unit: g).
- the battery using the gasket of the comparative example has a permeation rate of the electrolytic solution about 2 to 3 times faster than the battery 100 using the gasket 170 of the example. Therefore, from the experiment shown in FIG. 10, the gasket 170 in which the crystallinity of the insulation interposition part 171 is higher than the crystallinity of the insertion part 175 and the insulation side wall part 173 as in the embodiment is not as in the comparative example.
- the sealability between the battery case lid 113 and the electrode terminal members (the positive terminal member 130 and the negative terminal member 140) is good, and It was found that the good sealing performance was maintained.
- the gasket 170 of the embodiment As a manufacturing method of the gasket 170 of the embodiment, a manufacturing method according to Japanese Patent No. 3916728 of Yodogawa Hutech Co., Ltd. can be mentioned. Specifically, the gasket 170 having the above characteristics is manufactured as follows. First, a flat rectangular material molded product 20 was produced by punching out a 0.5 mm thick PFA sheet (slightly milky transparent sheet) obtained by extruding PFA having a melt flow index of 2 g / 10 min at 320 ° C. .
- a mold 30 consisting of three blocks was prepared.
- 30a is a first female mold
- 30b is a second female mold
- 30c is a male mold.
- the upper hole portion of the first female die 30a has a size that allows the raw material molded product 20 to enter
- the protrusion of the second female die 30b has a diameter that allows the through-hole 21 of the raw material molded product 20 to be fitted.
- the material molded product 20 is mounted on a mold obtained by combining the first female mold 30a and the second female mold 30b (see FIG. 11A), and then the male mold 30c is fitted into the female molds 30a and 30b. (See FIG. 11B).
- the mold 30 is heated up to 290 ° C. and kept at this temperature for 2 minutes to gel the material molded product 20, and then the male mold 30 c is pushed toward the female molds 30 a and 30 b, 100 kg / Pressurization was performed at a pressure of cm 2 . Thereby, the raw material molded product 20 was deformed into a three-dimensional softened three-dimensional molded product 23 along the mold cavity (see FIG. 11C).
- the mold 30 was poured into a large amount of water (room temperature) in the water tank, and the soft three-dimensional molded product 23 was cooled to obtain the target molded product 25.
- Step A is a step of supplying a material molded product 20 made of fluororesin having substantially the same capacity as the mold cavity capacity after pressing into the mold.
- the mold cavity capacity that is substantially the same as the mold cavity capacity after pressing is used if the capacity is smaller than the cavity capacity and is smaller than the allowable range. This is because if the capacity is larger than the cavity capacity and the capacity is larger than the cavity capacity, burrs are generated.
- the material molded product 20 is heated to the softening temperature or higher in the mold to be softened, and pressure is applied in the mold to form a three-dimensional softened three-dimensional molded product 23 along the mold cavity.
- the heating can be performed by electric heating, heating with a heat medium (oil, steam, gas), high-frequency heating, infrared heating, or the like.
- the heating temperature and the heating time are set to a temperature and time sufficient to heat the material molded product 20 to the softening temperature or higher.
- the temperature of the molded article 20 is preferably about 260 ° C. to 300 ° C., which is 50 ° C. to 0 ° C. lower than the melting point in the case of PFA (melting point 302 to 310 ° C.).
- the heating time is preferably kept for about 1 to 10 minutes, especially about 1.5 to 5 minutes after the temperature is raised to a predetermined temperature.
- Step C is a step of cooling the soft three-dimensional molded product 23 in the mold to a temperature equal to or lower than the softening temperature while maintaining a pressurized state to form the target molded product 25 and taking it out of the mold.
- a pressurizing method a mechanism using thermal expansion caused by heating can be adopted in addition to a mechanism using hydraulic pressure, pneumatic pressure, and water pressure. For example, a pressure of about 50 to 300 kg / cm 2 is appropriate.
- the material molding 20 made of a fluororesin is a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) and has a melt flow index (measured at a temperature 10 ° C. higher than the melting point) of about 5 g / It is an extruded product with a grade of less than 10 min. It is advantageous in terms of heat cycle shock resistance and stress crack resistance if the melt flow index (measured at a temperature 10 ° C higher than the melting point) is made of an extruded product of fluororesin with a grade of less than about 5 g / 10 min. is there.
- PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
- the gasket 170 of the embodiment was manufactured using tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) in consideration of excellent stress crack resistance and heat aging resistance.
- PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
- You may manufacture using a fluorine resin.
- FEP tetrafluoroethylene-hexafluoropropylene copolymer
- ETFE ethylene-tetrafluoroethylene copolymer
- ECTFE ethylene-chlorotrifluoroethylene copolymer
- vinylidene fluoride-based fluororubber propylene- Tetrafluoroethylene fluorine rubber, tetrafluoroethylene-perfluoroalkyl vinyl ether fluorine rubber, thermoplastic fluorine rubber, polytetrafluoroethylene (PTFE), or the like may be used.
- the heating temperature in the manufacturing process B described above is preferably about 200 to 260 ° C., which is about 50 to 0 ° C. lower than the melting point.
- the heating temperature in the above-described manufacturing step B is a temperature in the range of the softening temperature or higher and about 20-25 ° C. higher than the melting point, for example, 280-350 ° C. It is good to do.
- the battery 100 includes the electrode body 150 (power generation element) and the battery case body 111 (case body member) that has the opening 111d and accommodates the electrode body 150 together with the electrolyte. And a battery case lid 113 (case lid member) that closes the opening 111d of the battery case body 111, and an insertion portion 132 (142) that is inserted into a through hole 113h (113k) provided in the battery case lid 113.
- Electrode terminal members (positive electrode terminal member 130, negative electrode terminal member 140) electrically connected to electrode body 150, synthetic resin, electrode terminal members (positive electrode terminal member 130, negative electrode terminal member 140) and case lid member
- a gasket 170 battery sealing member having an insulating intermediate portion (seal portion) 171 sandwiched between the inner surface 113b of 113. That.
- the degree of crystallinity of the insulating interposition part 171 is higher than the degree of crystallinity of parts other than the insulating interposition part 171 (insertion part 175 and insulating side wall part 173).
- the insulating interposed portion (seal portion) 171 is a portion that is sandwiched between the electrode terminal members (the positive terminal member 130 and the negative terminal member 140) and the inner surface 113b of the case lid member 113, and is sandwiched between them. This is the part that receives compression force.
- the insulation interposition part 171 since the insulation interposition part 171 has a high crystallinity, the density of the insulation interposition part 171 is high. For this reason, molecules constituting the electrolytic solution are unlikely to pass through the insulating intervening portion 171. Therefore, it is possible to prevent the electrolytic solution (particularly, the evaporated electrolytic solution) from leaking out of the battery 100 through the gasket 170. In addition, entry of water or the like from the outside of the battery case lid 113 into the battery case 110 can be prevented.
- the degree of crystallinity of the insulating interposition part 171 is set to 40% or more, leakage of the electrolyte solution outside the battery 100 and entry of moisture into the battery 100 can be suitably prevented.
- the gasket 170 is formed with an insertion hole 175a through which the insertion portion 132 (142) is inserted, and the gasket 170 is located on the inner side near the insertion hole 175a when viewed from the insulating interposed portion 171.
- the insulating intermediate portion 171 has higher crystallinity than the insertion portion 175 and the insulating side wall portion 173.
- the insulating interposition part 171 having a high crystallinity is between the insertion part 175 and the insulating side wall part 173 having a low crystallinity.
- the gasket 170 is warmed, the crystalline portion in the insulating interposed portion 171 tends to change to amorphous, so that the insulating interposed portion 171 tends to expand accordingly.
- the insertion portion 175 and the insulating side wall portion 173 having a lower degree of crystallinity than the insulating interposed portion 171 are such that they have already expanded compared to the insulating interposed portion 171. Therefore, there is no room for accepting the expansion of the insulating interposition part 171. It should be noted that even if the force to expand the insulating interposed portion 171 acts on the insertion portion 175 and the insulating side wall portion 173, the force does not shrink the insertion portion 175 and the insulating side wall portion 173. Therefore, the expansion of the insulating interposition part 171 is suppressed.
- the battery 100 of the embodiment it is possible to prevent a decrease in crystallinity of the insulating interposition part 171 and maintain the crystallinity of the insulating interposition part 171 at a higher value than the insertion part 175 and the insulating side wall part 173. Therefore, good sealing performance by the gasket 170 can be maintained. If there is no difference in crystallinity between the insertion portion 175 of the gasket 170, the insulating side wall portion 173, and the insulating interposed portion 171 and all of them are uniformly increased, the insulation due to the increase in the operating environment temperature of the battery The insertion part 175 and the insulating side wall part 173 receive the expansion of the interposition part 171. Therefore, the degree of crystallinity of the insulating interposition part 171 decreases, and good sealing performance by the gasket 170 is not ensured.
- the state of the decrease in crystallinity as the temperature rises is shown in FIG. As shown in FIG. 12, it can be seen that the crystallinity of the gasket decreases as the operating environment temperature of the gasket increases. In particular, at a high temperature of 150 ° C. or higher, the decrease in the crystallinity of the gasket becomes significant.
- the crystallinity of the insulating interposition part 171 remains high even if such an increase in the operating environment temperature occurs. Can be maintained.
- the measurement of the crystallinity degree of the gasket in FIG. 12 was performed by XRD measurement. For XRD measurement, Bruker AXS D8ADVANCE was used.
- the insertion portion 175 since the crystallization degree of the insertion portion 175 is lower than the crystallization degree of the insulating interposition portion 171, the insertion portion 175 is configured with the same crystallinity as the insulating interposition portion 171. In comparison, the insertion portion 175 can be easily deformed. Therefore, the compressive load for caulking the electrode terminal members (the positive terminal member 130 and the negative terminal member 140) can be reduced. Therefore, deformation of the battery case lid 113 during caulking can be prevented.
- the crystallinity of the insulating interposition part 171 of the gasket 170 is higher than the crystallinity of the insertion part 175 and the insulating side wall part 173, but the specific gravity of the insulating interposition part 171 of the gasket 170 is set to You may make it higher than the specific gravity of the insulating side wall part 173.
- FIG. Even in such a configuration, the electrolyte does not easily pass through the insulating interposed portion 171 and the expansion of the insulating interposed portion 171 is suppressed by the insertion portion 175 and the insulating side wall portion 173 even at high temperatures. , The same effect as the embodiment can be obtained.
- the insertion portion 175 has its upper portion inserted into the through hole 113h (113k) of the battery case lid 113 together with the insertion portion 132 (142). Therefore, since the through hole 113h (113k) of the battery case lid 113 is closed by the insertion portion 175 of the gasket 170, the battery case lid 113 and the electrode terminal member (the positive terminal member 130, the negative terminal member 140) are sealed. Can be improved.
- the electrode terminal members are pedestal portions (flat plate portions) 131 (a flat plate portion) 131 that holds the insulating interposed portion 171 between the inner surface 113b of the battery case lid 113. 141), and the insertion portion 132 (142) extends vertically from the upper surface (one main surface) 131f (141f) of the pedestal portion 131 (141), and the insulating side wall portion 173 includes the pedestal portion 131.
- the outer peripheral side surface 131g (141g) which continues to the upper surface 131f (141f) of (141) is enclosed.
- the gasket 170 is fitted to the electrode terminal members (the positive terminal member 130 and the negative terminal member 140) so that the insulating side wall portion 173 of the gasket 170 surrounds the outer peripheral side surface 131g (141g) of the pedestal portion 131 (141). Therefore, the positioning of the gasket 170 with respect to the electrode terminal members (the positive electrode terminal member 130 and the negative electrode terminal member 140) is easy.
- the gasket 170 is rotated around the axis of the insertion portion 175 to assemble the gasket 170 so as to surround the outer peripheral side surface 131g (141g) with the insulating side wall portion 173 with respect to the pedestal portion 131 (141) having a substantially rectangular shape when viewed from above. Misalignment can be prevented.
- the battery case lid 113 has a convex portion 113p that protrudes downward on the lower surface 113b side of the through-hole peripheral portion 113c surrounding the through-hole 113h (113k). Therefore, when the electrode terminal members (the positive terminal member 130 and the negative terminal member 140) are caulked, the protruding portion 113p presses the insertion portion 175 side of the insulating interposition portion 171 of the gasket 170 to form the high compression portion 171p. Therefore, the high compression part 171p can improve the sealing performance between the battery case lid 113 and the positive electrode connecting member 135 (negative electrode connecting member 145).
- the battery 100 of the embodiment can be mounted on a vehicle that uses the electric energy from the battery 100 as a whole or a part of a power source.
- the battery 100 is kept at a high temperature due to the electrolyte in the battery case 110 jumping toward the battery case lid 113 due to vibrations associated with the traveling of the vehicle, or due to the heat generated by the traveling of the vehicle.
- the battery 100 according to the embodiment is used, leakage of the electrolyte solution outside the battery 100 and entry of moisture into the battery 100 can be suitably prevented even in such a use environment.
- the “vehicle” include an electric vehicle, a hybrid vehicle, a plug-in hybrid vehicle, a hybrid railway vehicle, a forklift, an electric wheelchair, an electrically assisted bicycle, and an electric scooter.
- the electrode terminal members (the positive terminal member 130 and the negative terminal member 140) only need to have the insertion portion 132 (142) inserted into the through hole 113h (113k) provided in the battery case lid 113.
- the positive electrode connecting member 135 (negative electrode connecting member 145), the positive electrode external terminal member 137 (negative electrode connecting member 147), and the positive electrode fastening member 139 (negative electrode fastening member 149) are not necessarily required.
- the insertion portion 175 (inner edge portion) of the gasket 170 is not necessarily inserted into the through hole 113h (113k) of the battery case lid 113.
- the insulating side wall portion 173 (outer edge portion) of the gasket 170 does not necessarily need to surround the outer peripheral side surface 131g (141g) of the pedestal portion 131 (141).
- the gasket (sealing member) 170 only needs to have a higher degree of crystallinity than the other portions, and the insertion portion 175 (inner edge portion) and the insulating side wall portion 173 (outer edge portion) are not necessarily required. It is not necessary to have.
- the lithium secondary battery 100 is exemplified as the battery, but the present invention can also be applied to other types of secondary batteries such as a nickel hydrogen battery and a nickel cadmium battery.
- the battery 100 having the wound power generation element (electrode body 150) is illustrated, but the present invention can also be applied to a battery having a stacked power generation element.
- the battery 100 which has the square battery case 110 was illustrated, this invention is applicable also to the battery etc. which have a cylindrical battery case.
- the insulation interposition part 171 has the high compression part 171p
- the whole insulation interposition part 171 is an example of the “seal part”.
- the sealing function is ensured only by the high compression portion 171p of the insulating interposed portion 171
- only the high compression portion 171p of the insulating interposed portion 171 is an example of the “seal portion”. That is, the other part of the part (insulating interposition part 171) that receives the compressive force by being sandwiched between the electrode terminal member (positive electrode terminal member 130, negative electrode terminal member 140) and the inner surface 113b of the case lid member 113. Only the portion (high compression portion 171p) that receives a larger compressive force than the above may be a “seal portion” in the claims.
- Electrode terminal member 131: Pedestal part (flat plate part) 131f ... Upper surface (one main surface) 131g ... outer peripheral side surface 132 ... insertion part 140 ... negative electrode terminal member (electrode terminal member) 141: Pedestal part (flat plate part) 141f ... Upper surface (one main surface) 141g ... outer peripheral side surface 142 ... insertion part 150 ... electrode body (power generation element) 170: First insulating member (gasket, battery sealing member) 171 ... Insulation interposition part (seal part) 173 ... Insulating side wall (outer edge) 175 ... Insertion part (inner edge part) 175a ... insertion hole
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
結晶化度(%)=(X/Y)×100 ・・・(1)
X:融解エンタルピー(測定融解熱量)
Y:完全融解エンタルピー(完全結晶体融解熱量)
ここで,融解エンタルピー(測定融解熱量)Xは,DSC分析装置を用いて測定した熱量である。完全融解エンタルピー(完全結晶体融解熱量)Yとは,格子欠陥や不純物のない理想的な完全結晶の融解熱量のことである。完全融解エンタルピー(完全結晶体融解熱量)Yは,ガスケット170の材料に応じて一義的に決まる値である。
111…電池ケース本体(ケース本体部材)
111d…開口
113…電池ケース蓋(ケース蓋部材)
113h, 113k…貫通孔
130…正極端子部材(電極端子部材)
131…台座部(平板部)
131f…上面(一主面)
131g…外周側面
132…挿通部
140…負極端子部材(電極端子部材)
141…台座部(平板部)
141f…上面(一主面)
141g…外周側面
142…挿通部
150…電極体(発電要素)
170…第1絶縁部材(ガスケット,電池用封止部材)
171…絶縁介在部(シール部)
173…絶縁側壁部(外縁部)
175…挿入部(内縁部)
175a…挿通孔
Claims (5)
- 発電要素と,開口を有して前記発電要素を電解液とともに内部に収容するケース本体部材と,前記ケース本体部材の前記開口を閉塞するケース蓋部材と,前記ケース蓋部材に設けられた貫通孔に挿通される挿通部を有するとともに,前記発電要素に電気的に接続される電極端子部材と,を備える電池に用いられ,
合成樹脂からなり,前記電極端子部材と前記ケース蓋部材の内面との間に挟持されるシール部を有する電池用封止部材であって,
前記シール部の結晶化度が,前記シール部以外の結晶化度よりも高いものである
ことを特徴とする電池用封止部材。 - 請求項1に記載の電池用封止部材であって,
前記シール部の結晶化度が40%以上である
ことを特徴とする電池用封止部材。 - 請求項1又は請求項2に記載の電池用封止部材であって,
前記挿通部を挿通させる挿通孔が形成されており,
前記シール部から見て前記挿通孔に近い内側に位置して前記挿通孔を囲む内縁部と,前記内縁部を囲む前記シール部と,前記シール部から見て前記内縁部とは反対の外側に位置して前記シール部を囲む外縁部とからなり,
前記シール部は,前記内縁部および前記外縁部より結晶化度が高いものである
ことを特徴とする電池用封止部材。 - 請求項3に記載の電池用封止部材であって,
前記内縁部は,少なくとも一部を前記挿通部とともに前記ケース蓋部材の貫通孔に挿通させるものである
ことを特徴とする電池用封止部材。 - 請求項3又は請求項4に記載の電池用封止部材であって,
前記電極端子部材として,前記ケース蓋部材の内面との間に前記シール部を挟持する平板部を備えるとともに,前記挿通部が前記平板部の一主面から垂直に延設されているものを有している前記電池に用いられ,
前記外縁部は,前記平板部の前記一主面と連なる周側面を囲うものである
ことを特徴とする電池用封止部材。
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CN201380027967.2A CN104364930B (zh) | 2012-06-25 | 2013-06-19 | 电池用密封部件 |
KR1020147035939A KR101686726B1 (ko) | 2012-06-25 | 2013-06-19 | 전지 |
US14/409,204 US9461279B2 (en) | 2012-06-25 | 2013-06-19 | Battery |
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JP (1) | JP5894118B2 (ja) |
KR (1) | KR101686726B1 (ja) |
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US11387497B2 (en) | 2012-10-18 | 2022-07-12 | Ambri Inc. | Electrochemical energy storage devices |
US10541451B2 (en) | 2012-10-18 | 2020-01-21 | Ambri Inc. | Electrochemical energy storage devices |
US11721841B2 (en) | 2012-10-18 | 2023-08-08 | Ambri Inc. | Electrochemical energy storage devices |
US11211641B2 (en) | 2012-10-18 | 2021-12-28 | Ambri Inc. | Electrochemical energy storage devices |
JP6685898B2 (ja) | 2013-10-16 | 2020-04-22 | アンブリ・インコーポレイテッド | 高温反応性材料デバイスのためのシール |
JP6398655B2 (ja) * | 2014-11-26 | 2018-10-03 | トヨタ自動車株式会社 | 電池及びその製造方法 |
JP2016105374A (ja) * | 2014-12-01 | 2016-06-09 | トヨタ自動車株式会社 | 密閉型電池 |
WO2016141354A2 (en) | 2015-03-05 | 2016-09-09 | Ambri Inc. | Ceramic materials and seals for high temperature reactive material devices |
JP6413976B2 (ja) * | 2015-08-18 | 2018-10-31 | トヨタ自動車株式会社 | 電池 |
JP6662652B2 (ja) * | 2016-02-02 | 2020-03-11 | プライムアースEvエナジー株式会社 | 二次電池及び絶縁体の成形方法 |
WO2018052797A2 (en) * | 2016-09-07 | 2018-03-22 | Ambri Inc. | Seals for high temperature reactive material devices |
US11929466B2 (en) | 2016-09-07 | 2024-03-12 | Ambri Inc. | Electrochemical energy storage devices |
JP6802980B2 (ja) * | 2017-03-23 | 2020-12-23 | トヨタ自動車株式会社 | 非水電解液二次電池 |
EP3607603A4 (en) | 2017-04-07 | 2021-01-13 | Ambri Inc. | MOLTEN SALT BATTERY WITH SOLID METAL CATHODE |
JP2020047544A (ja) * | 2018-09-21 | 2020-03-26 | トヨタ自動車株式会社 | 二次電池の製造方法 |
US10964925B2 (en) * | 2019-02-22 | 2021-03-30 | International Business Machines Corporation | Hermetial via seal for thin film battery |
CN116207414A (zh) * | 2021-11-30 | 2023-06-02 | 宁德时代新能源科技股份有限公司 | 一种端盖组件、电池单体、电池及用电装置 |
CN116169405A (zh) * | 2022-12-15 | 2023-05-26 | 珠海冠宇电池股份有限公司 | 一种电池及其制备方法 |
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US20150140415A1 (en) | 2015-05-21 |
CN104364930A (zh) | 2015-02-18 |
KR101686726B1 (ko) | 2016-12-14 |
CN104364930B (zh) | 2016-12-21 |
KR20150023437A (ko) | 2015-03-05 |
JP5894118B2 (ja) | 2016-03-23 |
JP2014029839A (ja) | 2014-02-13 |
US9461279B2 (en) | 2016-10-04 |
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