WO2014002560A1 - 電池およびその製造方法 - Google Patents
電池およびその製造方法 Download PDFInfo
- Publication number
- WO2014002560A1 WO2014002560A1 PCT/JP2013/059521 JP2013059521W WO2014002560A1 WO 2014002560 A1 WO2014002560 A1 WO 2014002560A1 JP 2013059521 W JP2013059521 W JP 2013059521W WO 2014002560 A1 WO2014002560 A1 WO 2014002560A1
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- WO
- WIPO (PCT)
- Prior art keywords
- battery case
- lid member
- battery
- welding
- case body
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 102
- 230000035515 penetration Effects 0.000 claims description 11
- 238000010248 power generation Methods 0.000 claims description 10
- 229910000679 solder Inorganic materials 0.000 claims 1
- 238000009413 insulation Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 description 22
- 238000003780 insertion Methods 0.000 description 18
- 230000037431 insertion Effects 0.000 description 18
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical group 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 15
- 239000000463 material Substances 0.000 description 8
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 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
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/049—Processes for forming or storing electrodes in the battery container
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape 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
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- 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
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/4911—Electric battery cell making including sealing
Definitions
- the present invention relates to a battery in which a power generation element is enclosed in a flat battery case and a method for manufacturing the same. More specifically, an external terminal member that is connected to the power generation element and functions as an external terminal is provided through the lid member of the battery case, and an insulating member that insulates the external terminal member from the lid member is a lid member.
- the present invention relates to a battery disposed on the outer surface side of the battery and a manufacturing method thereof.
- Examples of conventional batteries include those described in Patent Document 1.
- the battery shown in FIG. 2 of the same document has a flat overall shape by fitting a “sealing plate 31” into an opening of an “exterior can 10” that is open on one side.
- a “spiral electrode body 20” is accommodated inside the outer can 10.
- the sealing plate 31 is fixed to the outer can 10 by welding the boundary between the opening end surface of the outer can 10 and the sealing plate 31. This welding is performed by irradiating the “laser beam 50” from above on the welding location.
- Patent Document 1 JP 2000-268781
- Patent Document 1 has the following problems. As shown in FIG. 2 of Patent Document 1, the sealing plate 31 is provided with a “pole terminal 32” and a “gasket 33” surrounding it. And since the external shape of a battery is flat shape, there exists a location with little space
- an insulator corresponding to the gasket 33 may be provided so as to protrude outward from the outer surface of the lid member corresponding to the sealing plate 31. Particularly in such a case, the insulator may be burned by being beaten by a plume (metal vapor or plasma) coming out of the melting point during welding. This leads to deterioration of the insulating material and causes failure of insulation and sealing.
- an object of the present invention is to provide a battery and a method for manufacturing the same in which the member on the lid member is not burned by the plume during welding.
- a battery according to an aspect of the present invention has a flat battery case body with a built-in power generation element and one of which is open, a shape having a long side portion and a short side portion, and a lid that closes the opening portion of the battery case body
- a battery member having an external terminal member that is connected to the power generation element in the battery case body and is partially exposed to the outside and provided through the lid member, at least on the outer surface side of the lid member And an insulating member for insulating the external terminal member from the lid member.
- the distance between the edge of the insulating member and the long side of the lid member is smaller than the distance between the edge of the insulating member and the short side of the lid member, and the lid member is fitted into the opening of the battery case body.
- the weld mark extending over the outer surface of the lid member and the opening end surface of the battery case body is formed over the entire circumference of the lid member, so that the lid member is fixed to the battery case body and the interior of the battery case body is
- the section that is sealed from the outside and faces at least the insulating member on the long side of the lid member has weld marks not only on the outer surface of the lid member and the opening end surface of the battery case body but also on the outer surface of the battery case body. This is a wide welding mark section formed so as to extend.
- a battery manufacturing method includes a flat battery case body having a built-in power generation element and one open, and a shape having a long side portion and a short side portion.
- the lid member is fitted into the opening of the battery case body without covering the opening end face of the battery case body, and the boundary between the outer surface of the lid member and the opening end face of the battery case body is covered with the lid member.
- the lid member is fixed to the battery case main body and the inside of the battery case main body is sealed from the outside world.
- the welding trace is not only on the outer surface of the lid member and the opening end surface of the battery case body, but also on the outer surface of the battery case body.
- the first level energy is formed to extend, and the second level energy equal to or lower than the first level is used in sections other than the section where welding with the first level energy is performed.
- the section other than the wide welding mark section includes a section on the short side of the lid member.
- the welding trace extends over the outer surface of the lid member and the opening end surface of the battery case main body and extends only locally on the outer surface of the battery case main body.
- the welding marks in the sections other than the wide welding mark section do not reach the outer surface of the battery case main body, or even if they extend, only locally.
- the second level which is the level of welding energy in the section other than the wide welding mark section, is equal to or lower than the first level, and is preferably lower than the first level.
- the central direction of the approximate sector shape applied to the arc-shaped portion of the cross-sectional shape of the weld trace is greater in the wide weld trace section than in the sections other than the wide weld trace section. It is preferable to incline outward.
- the penetration width to the battery case body side at the boundary between the outer surface of the lid member and the battery case body at the portion not melted at the time of welding is set on the lid member side. It is preferable that the value obtained by dividing by the penetration depth to be larger in the wide welding trace section than in the section other than the wide welding trace section.
- the boundary between the outer surface of the lid member and the battery case body in the portion not melted during welding extends from the line extending from the surface of the weld case to the battery case body side.
- the value obtained by dividing the surface length by the surface length on the lid member side is preferably larger in the wide welding trace section than in the sections other than the wide welding trace section.
- the external terminal member and the insulating member are provided at positions near both ends in the long side direction of the lid member, respectively, and the wide weld mark section is insulative with respect to the long side direction of the lid member. It is desirable to form over the section facing the member, the section facing the other insulating member, and the section between these sections. That is, in the battery manufacturing method of this aspect, the welding at the first level energy is performed with respect to the long side direction of the lid member, the section facing one insulating member, the section facing the other insulating member, and those sections. It is desirable to carry out over the section between these sections. This is more advantageous in terms of bonding strength between the lid member and the battery case body.
- FIG. 1 It is sectional drawing which shows the battery which concerns on embodiment. It is an enlarged view of the B section and C section of FIG. It is a figure which shows the cover member with a terminal which concerns on embodiment. It is a perspective view of the electrode body which concerns on embodiment. It is a figure which shows the positive electrode plate which comprises the same electrode body. It is a figure which shows the negative electrode plate which comprises the same electrode body. It is a figure explaining the overlapping state of the positive / negative electrode plate etc. in the same electrode body. It is the top view which looked at the battery concerning an embodiment from the upper part. It is a part of top view which looked at the battery concerning an embodiment from the upper part at the time before welding. FIG.
- FIG. 10 is a cross-sectional view at a time point during and after welding of the X portion in FIG. 9.
- FIG. 10 is a cross-sectional view at a time point during and after welding of a Y portion in FIG. 9. It is sectional drawing in the time in the middle of welding of the Y location in a comparative example.
- FIG. 12 is a cross-sectional view for further explaining the melted portion shown in FIG. 11.
- FIG. 12 is a cross-sectional view for further explaining the melted portion shown in FIG. 11.
- It is sectional drawing which shows the condition of the welding location before welding in a comparative example.
- 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.
- a member in which a symbol without parentheses and a symbol with parentheses are written in two stages are different in the B part and the C part. That is, the reference numerals without parentheses are for the B part member, and the reference numerals with parentheses are for the C part member.
- FIG. 3 is an exploded perspective view of a part of the lid member with terminal 115 according to the embodiment.
- the battery 100 includes a lithium ion secondary battery that includes a rectangular box-shaped battery case body 111 having an opening 111 d and an electrode body 150 accommodated in the battery case body 111. It is a battery. Further, the battery 100 includes a plate-shaped battery case lid 113 that closes the opening 111 d 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 lid 113 has a rectangular plate shape, and circular through holes 113h and 113k penetrating the battery case lid 113 are formed at positions near both ends in the long side direction (left and right direction in FIG. 1). Has been.
- a safety valve 113j is provided at the longitudinal center of the battery case cover 113. 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 has a positive terminal member 130 and a negative terminal member 140 (outside terminal member) that extend to the outside through the through holes 113h and 113k of the battery case lid 113. ).
- the positive terminal member 130 includes a positive connection member 135, a positive external terminal member 137, and a positive fastening bolt 139 (see FIGS. 1 and 3).
- the positive electrode connecting member 135 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 external terminal member 137 is located on the battery case lid 113, that is, outside the battery case 110, and is electrically connected to the positive electrode connection member 135 outside the battery case 110.
- the positive fastening bolt 139 is located on the battery case lid 113, that is, outside the battery case 110, and is electrically connected to or connectable to the positive external terminal member 137.
- the positive electrode connecting member 135, the positive electrode external terminal member 137, and the positive electrode fastening bolt 139 are all made of aluminum.
- the positive electrode connection member 135 includes a pedestal part 131, an insertion part 132, an electrode body connection part 134, and a caulking part 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 part 132 has a cylindrical shape protruding from the upper surface 131 f of the pedestal part 131 and is inserted into the through hole 113 h 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, that is, deformed so as to expand in diameter, has a disk shape, and is electrically connected to the positive external terminal member 137. .
- the electrode body connecting portion 134 is joined to the positive electrode mixture layer non-coated portion 151b of the electrode body 150 in a form extending from the lower surface 131b of the pedestal portion 131 to the bottom surface 111b side of the battery case 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 has a substantially Z shape in a 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 fastening bolt 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 bolt 139 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 bolt 139 is inserted into the through hole 137c of the positive electrode external terminal member 137.
- the negative electrode terminal member 140 includes a negative electrode connection member 145, a negative electrode external terminal member 147, and a negative electrode fastening bolt 149 (see FIGS. 1 and 3).
- the negative electrode connection member 145 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 located on the battery case lid 113, that is, 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 bolt 149 is located on the battery case lid 113, that is, outside the battery case 110, and is electrically connected to or connectable to the negative electrode external terminal member 147.
- the negative electrode connection member 145, the negative electrode external terminal member 147, and the negative electrode fastening bolt 149 are all made of copper.
- the negative electrode connection member 145 includes a pedestal 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 portion 142 has a cylindrical shape protruding from the upper surface 141 f of the pedestal portion 141 and is inserted into the through hole 113 k of the battery case lid 113.
- the caulking portion 143 is a portion connected to the upper end of the insertion portion 142, and is caulked, that is, deformed so as to expand in diameter, has a disk shape, and is electrically connected to the negative external terminal member 147. .
- the electrode body connecting portion 144 is joined to the negative electrode mixture layer non-coated 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 external terminal member 147 has a substantially Z shape in side view.
- the negative external terminal member 147 includes a fixing portion 147f fixed by the crimping portion 143, a connecting portion 147g connected to the negative fastening bolt 149, and a connecting portion 147h connecting the fixing portion 147f and the connecting portion 147g. ing.
- a through hole 147b is formed in the fixing portion 147f, and the insertion portion 142 of the negative electrode connection member 145 is inserted into the through hole 147b.
- the connecting portion 147g is also formed with a through hole 147c penetrating therethrough.
- the negative electrode fastening bolt 149 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 bolt 149 is inserted into the through hole 147 c of the negative electrode external terminal member 147.
- the battery 100 includes a first insulating member 170 that 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 both.
- 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 made of an electrically insulating resin and has an insulating interposition part 171, an insulating side wall part 173, and an insertion part 175 (see FIGS. 2 and 3).
- the insulation interposition part 171 has a flat plate shape, and has a circular through hole 175a through which the insertion part 132 (insertion part 142) of the positive electrode terminal member 130 (negative electrode terminal member 140) is inserted. Yes.
- the insulating interposition part 171 is interposed between the upper surface 131 f (upper surface 141 f) of the pedestal part 131 (pedestal part 141) of the positive electrode terminal member 130 (negative electrode terminal member 140) and the battery case lid 113.
- the insulating side wall part 173 is a square annular side wall part located at the periphery 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).
- the insertion portion 175 has a cylindrical shape protruding from the upper surface 171f of the insulating interposition portion 171 and is inserted through the through hole 113h (through hole 113k) of the battery case lid 113.
- 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 cylinder of the insertion portion 175.
- the battery 100 includes a second insulating member 180 made of an electrically insulating resin and disposed on the battery case lid 113.
- the second insulating member 180 is interposed between the positive terminal member 130 (specifically, the positive external terminal member 137 and the positive fastening bolt 139) and the battery case lid 113, and electrically insulates both.
- the second insulating member 180 is also interposed between the negative terminal member 140 (specifically, the negative external terminal member 147 and the negative fastening bolt 149) and the battery case lid 113.
- the second insulating member 180 includes a head arrangement portion 181 where the head portion 139b of the positive electrode fastening bolt 139 (the head portion 149b of the negative electrode fastening bolt 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 lid 113 and is elastically compressed and arranged in its own thickness direction (vertical direction in FIG. 2). Further, the insertion portion 175 of the first insulating member 170 is elastically compressed in its own axial direction (vertical direction in FIG. 2), and its tip 175 b 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 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 (see FIGS. 4 to 7).
- the positive electrode plate 155 has a belt-like shape extending in the longitudinal direction DA, and is disposed on a part of the surface of the positive electrode substrate 151 that is a current collector foil made of aluminum foil and the positive electrode substrate 151.
- a positive electrode mixture layer 152 includes a positive electrode active material 153, a conductive material made of acetylene black, and PVDF (polyvinylidene fluoride, binder).
- 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 non-coated portion 151b.
- the positive electrode mixture layer non-coated portion 151b is located at the end (left end in FIG. 5) of the positive electrode base 151 (positive plate 155) in the width direction DB (left and right in FIG. 5). Along the one long side of the positive electrode plate 155), it extends in the longitudinal direction DA of the positive electrode base material 151 (positive electrode plate 155), that is, in the vertical direction in FIG.
- the negative electrode plate 156 is a belt-shaped member extending in the longitudinal direction DA, and a negative electrode base material 158 that is a current collector foil made of copper foil, and a part of the surface of the negative electrode base material 158. And a negative electrode mixture layer 159 arranged.
- the negative electrode mixture layer 159 includes a negative electrode active material 154, SBR (styrene-butadiene rubber, binder), and CMC (carboxymethyl cellulose, thickener).
- 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 non-coated portion 158b.
- the negative electrode mixture layer non-coated portion 158b is located at the end (right end in FIG. 6) of the negative electrode base 158 (negative electrode plate 156) in the width direction DB (left and right in FIG. 6).
- the negative electrode substrate 158 (negative electrode plate 156) extends in the longitudinal direction DA, that is, in the vertical direction in FIG.
- FIG. 4 is obtained by winding a positive electrode plate 155, a negative electrode plate 156, and a separator 157 while overlapping each other as shown in FIG. That is, in the superposition of FIG. 7, the positive electrode plate 155, the negative electrode plate 156, and the two separators 157 are superposed, and the positive electrode mixture layer non-coated portion 151b and the negative electrode mixture layer non-coated portion 158b are reversed. It is designed to protrude in the direction.
- the width of the separator 157 is substantially the same as the width of the positive electrode mixture layer coating portion 151c and the negative electrode mixture layer coating portion 158c. Therefore, in FIG.
- the positive electrode mixture layer non-coated portion 151b is a stack of a plurality of positive electrode base materials 151
- the negative electrode mixture layer non-coated portion 158b is a plurality of sheets.
- the negative electrode base material 158 is superposed.
- a feature of the present invention resides in a welded portion between the battery case main body 111 and the battery case lid 113. As shown in the plan view of FIG. 8, in the battery 100, the boundary between the battery case main body 111 and the battery case lid 113 is welded over the entire circumference to form a welding mark 160.
- FIG. 9 is a plan view of the battery case cover 113 (terminal cover member 115) fitted into the battery case body 111 and before welding. Although not shown, the negative electrode side near the right end is the same.
- the width of the welding mark (the portion melted during welding) 160 is different between the long side 113 a and the short side 113 b of the battery case lid 113. .
- the welding mark 160 is wide at the long side 113a, whereas the welding mark 160 is narrow at the short side 113b.
- FIG. 10 shows a cross-sectional view of the X portion in FIG. 9, and
- FIG. 11 shows a cross-sectional view of the Y portion. From these sectional views, it can be seen that the battery case lid 113 is thicker than the battery case body 111.
- the welding trace 160 straddles the upper surface 113e of the battery case lid 113 and the opening end surface 111e of the battery case main body 111, but on the outer side surface 111s of the battery case main body 111. It does not reach.
- FIG. 11 on the long side it extends from the upper surface 113 e of the battery case lid 113 to the outer surface 111 s of the battery case main body 111. This difference between the short side and the long side appears as the width of the weld mark 160 in FIG.
- FIG. 10 When welding the short side portion as shown in FIG. 10, melting during welding is applied only to the upper surface 113 e of the battery case lid 113 and the opening end surface 111 e of the battery case main body 111, and to the outer surface 111 s of the battery case main body 111. Therefore, the welding energy is set to a relatively small value.
- the battery case lid 113 and the battery case main body 111 are melted almost uniformly. For this reason, the approximate sector T of the melted portion is almost vertical.
- the plume P is ejected in the direction of the arrow Q that is the central direction of the approximate sector T, that is, vertically upward.
- the approximate sector T is a sector configured by a portion of the surface shape of the weld mark 160 in the cross section that can be approximated by an arc and radii with respect to both ends of the arc.
- the welding energy is increased as compared with the case where the short side portion is welded. Then, compared with FIG. 10, the melting range becomes wider. Further, the penetration depth Ma is also larger than the penetration depth Mb in FIG. However, the melting range does not spread evenly on the battery case lid 113 side and the battery case body 111 side. The melting range widens more on the battery case body 111 side and does not spread much on the battery case lid 113 side.
- the plume P is ejected from the edge (long side) of the battery case lid 113 almost vertically even though the gap Ga is small. Will be. That is, the plume P exists in the immediate vicinity of the second insulating member 180, and the second insulating member 180 may be burned. In particular, if the plume P sways due to a surrounding air current or the like, the plume P easily hits the second insulating member 180 as shown in FIG. On the other hand, in this embodiment, the above-mentioned adverse effects are prevented by welding the long side portion with large energy.
- the welding method may be any method as long as it can be welded to the welded part in a non-contact manner such as laser welding.
- the penetration width Wa to the battery case main body 111 side when viewed from above and the battery case The penetration width Wb to the lid 113 side can be considered.
- the penetration width Wa is larger than the penetration width Wb. That is, “Wa / Wb” is larger than 1.
- “Wa / Wb” is almost 1 in consideration of this in the short-side weld mark 160 of FIG. Therefore, it can be said that the value of “Wa / Wb” is larger in the long-side weld mark 160 than in the short-side weld mark 160.
- the value of Wa itself is larger at the long side than at the short side.
- the surface length La on the battery case body 111 side and the surface length Lb on the battery case lid 113 side of the welding mark 160 can be considered with respect to the extension line S on the cross-sectional view. .
- the surface length La is larger than the surface length Lb.
- the value of “La / Lb” is larger in the welding mark 160 in the long side portion than in the welding mark 160 in the short side portion.
- the value of La itself is larger at the long side than at the short side.
- the battery case lid 113 (lid member 115 with terminal) is fitted into the battery case main body 111 and before the welding is performed before the opening end surface 111e of the battery case main body 111 is opened. Is not covered by the battery case lid 113. In such a case, the plume P at the time of welding is ejected to the upper surface side of the battery case lid 113, that is, to the side where the second insulating member 180 is present.
- the case where the opening end surface 111e is covered by the battery case lid 113 before welding is not an object of the present invention. This is because it is impossible that the plume P at the time of welding reaches the second insulating member 180 in such a case.
- the opening end surface 111e is exposed without being covered by the battery case cover 113, and thus can be applied to the present invention. Further, even if a shape (for example, the groove 113f in FIG. 18) other than those described above is further formed on the upper surface 113e of the battery case lid 113, application of the present invention is not hindered. 13 to 18, the second insulating member 180 and the like in FIG. 11 and the like are omitted.
- the wide welding mark 160 shown in FIG. 11 needs to be provided at least in a region facing the second insulating member 180 in the vicinity of both ends of the battery case lid 113. That is, it is the section Z1, Z3 in FIG.
- the wide welding marks 160 of the sections Z1 and Z3 may be formed, or the narrow welding marks 160 of FIG. 10 may be formed as in the short side.
- the wide welding mark 160 of FIG. 11 may be formed over the entire circumference of the battery case lid 113. Further, in the actual product, even in the section where the narrow welding mark 160 of FIG. 10 is formed by welding with low energy, the welding mark 160 locally reaches the outer surface 111s of the battery case body 111 in some places. Is possible.
- planar shape of the battery case lid 113 has been described as a rectangular plate, the corner may be round as shown in FIG. In short, it is only necessary to recognize the long side portion and the short side portion. Further, the short side portion may have a shape without a straight portion as shown in FIGS. 19 and 20.
- the battery 100 has a flat shape, and the open end surface 111e of the battery case main body 111 is not covered with the battery case lid 113 before the welding.
- the welding energy is changed between the short side portion and the long side portion of the case lid 113, and the welding energy at the long side portion is increased from the short side portion.
- the battery case body 111 side is more melted and the plume P is inclined outward and ejected. In this way, the battery 100 and its manufacturing method are realized in which the plume P during welding prevents the second insulating member 180 and the like on the battery case lid 113 from being damaged.
- Electrode body 160 Weld mark 180 Second insulating member (insulating member) Ga, Gb Spacing La, Lb Surface length Q, R of welding trace Central direction T Approximate sector Wa, Wb Penetration width Z1, Z3 Section Z2 facing section of insulation member Z1, section Z3
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Abstract
Description
111e 電池ケース本体の開口端面
113 電池ケース蓋(蓋部材)
113e 電池ケース蓋の上面
130,140 端子部材(対外端子部材)
150 電極体
160 溶接痕
180 第2絶縁部材(絶縁部材)
Ga,Gb 間隔
La,Lb 溶接痕の表面長
Q,R 近似扇形の中心方向
T 近似扇形
Wa,Wb 溶接痕の溶け込み幅
Z1,Z3 絶縁部材に対面する区間
Z2 区間Z1,Z3の間の区間
Claims (7)
- 発電要素を内蔵するとともに一方が開口した扁平形状の電池ケース本体と,長辺部と短辺部とを有する形状であり前記電池ケース本体の開口部を塞ぐ蓋部材とを有する電池において,
前記電池ケース本体内で前記発電要素に接続するとともに部分的に外部に露出する,前記蓋部材を貫通して設けられた対外端子部材と,
少なくとも前記蓋部材の外面側に配置され,前記対外端子部材を前記蓋部材から絶縁する絶縁部材とを有し,
前記絶縁部材の縁辺と前記蓋部材の長辺との間隔が,前記絶縁部材の縁辺と前記蓋部材の短辺との間隔より小さく,
前記蓋部材は,前記電池ケース本体の開口部にはめ込まれており,
前記蓋部材の外面と前記電池ケース本体の開口端面とに跨る溶接痕が前記蓋部材の全周にわたって形成されることで,前記蓋部材が前記電池ケース本体に固定されるとともに前記電池ケース本体の内部が外界から密閉されており,
前記蓋部材の長辺上のうち少なくとも前記絶縁部材に対面する区間は,前記溶接痕が,前記蓋部材の外面および前記電池ケース本体の開口端面のみならず前記電池ケース本体の外側面にも及んで形成されている幅広溶接痕区間とされていることを特徴とする電池。 - 請求項1に記載の電池において,
前記溶接痕の断面形状のうち表面が円弧状である部分に当てはめられる近似扇形の中心方向が,前記幅広溶接痕区間では,前記幅広溶接痕区間以外の区間と比較して,より外側向きに傾いていることを特徴とする電池。 - 請求項1に記載の電池において,
前記溶接痕を外部から見たときにおける,溶接時に溶融しなかった部分での前記蓋部材の外面と前記電池ケース本体との境目に対する前記電池ケース本体側への溶け込み幅を前記蓋部材側への溶け込み幅で割った値が,前記幅広溶接痕区間では,前記幅広溶接痕区間以外の区間と比較して大きいことを特徴とする電池。 - 請求項1に記載の電池において,
前記溶接痕の断面における表面長のうち,溶接時に溶融しなかった部分における前記蓋部材の外面と前記電池ケース本体との境目を前記溶接痕の表面に延長した線より前記電池ケース本体側の表面長を前記蓋部材側の表面長で割った値が,前記幅広溶接痕区間では,前記幅広溶接痕区間以外の区間と比較して大きいことを特徴とする電池。 - 請求項1から請求項4までのいずれか1つに記載の電池において,
前記対外端子部材および前記絶縁部材が,前記蓋部材の長辺方向の両端寄りの位置にそれぞれ設けられており,
前記幅広溶接痕区間が,前記蓋部材の長辺方向に対し,一方の前記絶縁部材に対面する区間ともう一方の前記絶縁部材に対面する区間とそれらの区間の間の区間とにわたって形成されていることを特徴とする電池。 - 発電要素を内蔵するとともに一方が開口した扁平形状の電池ケース本体と,長辺部と短辺部とを有する形状であり前記電池ケース本体の開口部を塞ぐ蓋部材とを有する電池の製造方法において,
対象とする電池は,
前記電池ケース本体内で前記発電要素に接続するとともに部分的に外部に露出する,前記蓋部材を貫通して設けられた対外端子部材と,
少なくとも前記蓋部材の外面側に配置され,前記対外端子部材を前記蓋部材から絶縁する絶縁部材とを有し,
前記絶縁部材の縁辺と前記蓋部材の長辺との間隔が,前記絶縁部材の縁辺と前記蓋部材の短辺との間隔より小さいものであり,
前記蓋部材を,前記電池ケース本体の開口端面を覆うことなく前記電池ケース本体の開口部にはめ込んだ状態とし,
前記蓋部材の外面と前記電池ケース本体の開口端面との境目を前記蓋部材の全周にわたって溶接することで,前記蓋部材を前記電池ケース本体に固定するとともに前記電池ケース本体の内部を外界から密閉し,
前記溶接の際のエネルギーを,
前記蓋部材の長辺上のうち少なくとも前記絶縁部材に対面する区間では,溶接痕が前記蓋部材の外面および前記電池ケース本体の開口端面のみならず前記電池ケース本体の外側面にも及んで形成される第1レベルのエネルギーとし,
前記第1レベルのエネルギーでの溶接がなされる区間以外の区間では,前記第1レベル以下の第2レベルのエネルギーとすることを特徴とする電池の製造方法。 - 請求項6に記載の電池の製造方法において,
対象とする電池は,前記対外端子部材および前記絶縁部材が,前記蓋部材の長辺方向の両端寄りの位置にそれぞれ設けられているものであり,
前記第1レベルのエネルギーでの溶接を,前記蓋部材の長辺方向に対し,一方の前記絶縁部材に対面する区間ともう一方の前記絶縁部材に対面する区間とそれらの区間の間の区間とにわたって行うことを特徴とする電池の製造方法。
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- 2013-03-29 CN CN201380034482.6A patent/CN104412414B/zh active Active
- 2013-03-29 EP EP13809988.2A patent/EP2869360B1/en active Active
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Also Published As
Publication number | Publication date |
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JP2014010937A (ja) | 2014-01-20 |
EP2869360A1 (en) | 2015-05-06 |
KR20150027114A (ko) | 2015-03-11 |
JP5969282B2 (ja) | 2016-08-17 |
KR101696991B1 (ko) | 2017-01-16 |
EP2869360A4 (en) | 2016-02-24 |
CN104412414B (zh) | 2016-12-14 |
CN104412414A (zh) | 2015-03-11 |
EP2869360B1 (en) | 2018-03-28 |
US20150118546A1 (en) | 2015-04-30 |
US9608239B2 (en) | 2017-03-28 |
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