WO2013093965A1 - 電池容器、及びその製造方法 - Google Patents
電池容器、及びその製造方法 Download PDFInfo
- Publication number
- WO2013093965A1 WO2013093965A1 PCT/JP2011/007131 JP2011007131W WO2013093965A1 WO 2013093965 A1 WO2013093965 A1 WO 2013093965A1 JP 2011007131 W JP2011007131 W JP 2011007131W WO 2013093965 A1 WO2013093965 A1 WO 2013093965A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery container
- sealing member
- case member
- welding
- melted
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000007789 sealing Methods 0.000 claims abstract description 80
- 238000003466 welding Methods 0.000 claims abstract description 63
- 230000035515 penetration Effects 0.000 claims description 30
- 238000002844 melting Methods 0.000 claims description 27
- 230000008018 melting Effects 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 abstract description 2
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 6
- 230000008719 thickening Effects 0.000 description 5
- 230000004927 fusion Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 235000013372 meat Nutrition 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
- H01M50/102—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/206—Laser sealing
-
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a battery container in which a case member opened on one side and a sealing member for closing the opening are joined by welding, and a manufacturing method thereof.
- one of the case members includes a case member that opens and accommodates the battery member therein, and a sealing member that closes the opening, and the protruding portion of the case member and the protruding portion of the sealing member are joined together by welding.
- a battery container manufacturing method is known (see, for example, Patent Document 1).
- Patent Document 1 when the protruding portion is small and the energy of the welding beam is large, the protruding portion may melt and a welding defect may occur.
- the present invention has been made to solve such problems, and it is a main object of the present invention to provide a battery container whose reliability is improved by optimal welding and a method for manufacturing the same. To do.
- One aspect of the present invention for achieving the above object is a battery container comprising a case member having one opening and a sealing member for closing the opening, wherein the case member and the sealing member are brought into contact with each other.
- a lacking part is formed in the vicinity of the melted part that is melted by irradiation with a welding beam, and the case member and the sealing member are welded so that the melted part reaches the lacking part.
- the width of the lacking portion in the welding beam irradiation direction may be 1/3 or more of the penetration depth of the melted portion.
- a thickened portion is formed on the outer side of the case member or the sealing member along the irradiation direction of the welding beam so that the melted portion is within the range of the thickened portion.
- the welding may be performed.
- the thick part is a thickened gradually changing part that gradually increases in thickness outward, and a thickened constant part that is integrally formed with the thickened gradually changing part and has a constant thickness,
- a value obtained by subtracting the thickness of the normal surface other than the thick portion from the thickness of the constant thickness increase portion may be 1/3 or more of the penetration depth of the melted portion.
- a value obtained by subtracting the height of the gradually increasing thickness portion from the height of the thick portion may be equal to or less than the penetration depth of the melting portion.
- the lacking portion may be formed in a groove shape all around or intermittently along the outer edge and the opening along at least one of the outer edge of the sealing member and the opening of the case member.
- the thinned portion is cut obliquely downward along the outer edge of the sealing member so that the upper surface corner of the sealing member has a curved corner in the vicinity of the melting portion. It may be formed.
- the case member and the sealing member may be joined and sealed by laser welding.
- one aspect of the present invention for achieving the above object is a method of manufacturing a battery container in which a case member having one opening and a sealing member for closing the opening are joined by welding.
- It may be the manufacturing method of the battery container characterized by including.
- the width of the lacking portion in the welding beam irradiation direction may be 1/3 or more of the penetration depth of the melted portion.
- the case member or the sealing member is formed with a thick portion that is thicker on the outer side of the case member or the sealing member along the irradiation direction of the welding beam, and the melting portion May be welded so as to be within the range of the thick part.
- the present invention it is possible to provide a battery container whose reliability has been improved by performing welding optimally, and a manufacturing method thereof.
- FIG. 4 is a cross-sectional enlarged view in which a cross section when the battery container shown in FIG. 3 is cut along a line AA is partially enlarged.
- FIG. 6 is an enlarged cross-sectional view in which the sealing member shown in FIG. 5 is cut along a straight line AA and partially enlarged.
- FIGS. 1 and 2 are diagrams showing a schematic configuration of a battery container according to an embodiment of the present invention.
- the battery container 10 is provided with a case member 1 that is open at one end and accommodates a battery member therein, and a sealing member 2 that closes the opening 11.
- the sealing member 2 is attached with a positive current collecting terminal 3 to which a positive external terminal 6 is connected and a negative current collecting terminal 4 to which a negative external terminal 7 is connected.
- the electrode body 5 is connected to the lower side of the positive current collector terminal 3 and the negative current collector terminal 4.
- the electrode body 5 connected to the lower side of the positive current collector terminal 3 and the negative current collector terminal 4 is accommodated in the case member 1, and the opening 11 of the case member 1 is closed by the sealing member 2.
- the case member 1 and the sealing member 2 are joined and sealed by laser welding or the like.
- the battery container 10 according to the present embodiment is configured as, for example, a substantially rectangular prismatic sealed lithium ion secondary battery, and is mounted on an electric vehicle, a hybrid car, a portable terminal, or the like.
- FIG. 3 is a perspective view showing a schematic configuration of the case member according to the present embodiment.
- the case member 1 is formed in a substantially rectangular parallelepiped shape, for example, by a metal such as lightweight aluminum, and the upper surface thereof is open.
- FIG. 4 is a cross-sectional enlarged view in which the cross section when the battery container shown in FIG. 3 is cut along a line AA is partially enlarged.
- the thick portion 12 is formed along the opening 11 of the case member 1, thereby improving the strength and the sealing performance.
- the thick part 12 is formed integrally with the thickening gradually changing part 121 whose thickness is gradually increased outward as it goes upward, and the thickening constant with a constant thickness. Part 122.
- (increased thickness plate thickness L1) ⁇ normal face plate thickness L2) is equal to the penetration depth A (FIG. 8) of the melted portion 13 which melts when the case member 1 and the sealing member 2 are welded. 1/3 or more (L1 ⁇ L2 ⁇ A / 3), and ((increased thickness L3) ⁇ (increased thickness gradually changing portion L4)) is equal to or less than the penetration depth A of the melted portion 13 (L3 ⁇ 3). It is preferable that L4 ⁇ A).
- the case member 1 is configured to have the thick portion 12 along the opening 11, but is not limited thereto, and may be configured not to have the thick portion 12.
- FIG. 5 is a perspective view showing a schematic configuration of the sealing member according to the present embodiment.
- the sealing member 2 is formed of, for example, a metal such as aluminum, and has openings 21 and 22 into which the positive current collecting terminal 3 and the negative current collecting terminal 4 are inserted.
- the sealing member 2 is formed with a concave fitting portion 23 and a cutout portion 24 along the outer edge thereof.
- FIG. 6 is a cross-sectional enlarged view in which the sealing member shown in FIG. 5 is cut along a straight line AA and partially enlarged.
- the fitting portion 23 is formed by cutting out the lower surface side along the outer edge of the sealing member 2 and fits into the opening 11 of the case member 1.
- the cutout portion 24 is formed by cutting the top corner in the vicinity of the melted portion 13 along the outer edge of the sealing member 2 by a cutout portion width L5 in the welding laser (beam) irradiation direction. It is formed substantially parallel to the upper side with respect to the portion 23.
- the corner 241 of the cutout portion 24 formed by the cutout is preferably formed in a curved surface such as an R shape or a C shape in order to maintain the strength of the melting portion 13 (FIG. 12).
- the underfill portion width L5 is set to 1/3 or more (L5 ⁇ A / 3) of the penetration depth A of the melting portion 13 between the case member 2 and the sealing member 1. Thereby, welding heat can be more intensively transmitted in the penetration depth direction.
- the lacking portion 24 is formed in a groove shape along the outer edge of the sealing member 2, but is not limited to this, for example, only in a portion having low strength along the outer edge of the sealing member 2. It may be formed intermittently. As described above, since the thinned portion 24 is partially formed to reduce the thin portion, the durability and sealing performance of the battery container 10 are further improved.
- the underfill portion 24 is formed in the vicinity of the melting portion 13 of the sealing member 2, but is not limited to this, for example, in the vicinity of the melting portion 13 of the case member 2 or the melting of the sealing member 2 and the case member 1. Each may be formed near the portion 13.
- FIG. 7 is a cross-sectional enlarged view in which the case member and the fitting portion of the sealing member are fitted to each other, and the state in which the opening of the case member is closed with the sealing member is partially enlarged.
- the case member 1 and the sealing member are sealed as shown in FIG.
- the member 2 is melted to a penetration depth A and joined.
- the upper side (one side) of the melting part 13 reaches the lacking part 24 of the sealing member 2, and (b) the lower side (other side) of the melting part 13 is the thickness of the case member 1.
- the laser welding is preferably performed so as to be within the range of the meat portion 12 (within the range of the thickened portion height L3). Thereby, welding heat can be intensively transmitted in the penetration depth direction without diffusing.
- a laser welding apparatus is used.
- the present invention is not limited to this.
- an electron beam welding apparatus may be used, and any welding apparatus capable of irradiating an energy beam can be used.
- the lacking portion 24 is formed in the vicinity of the melting portion 13 in which the case member 1 and the sealing member 2 are fitted and their mating surfaces are melted. ing.
- welding heat is intensively transmitted from the surface of the fusion zone 13 in the penetration depth direction without diffusing, a deeper penetration depth A of the fusion zone 13 can be obtained with less welding energy. . That is, a more optimal welding is possible by the deep penetration depth A of the melted part 13 while suppressing welding defects with a small amount of welding energy.
- the manufacturing method of the battery container 10 according to the present embodiment will be described in detail.
- the case member 1 and the sealing member 2 are generated.
- the lacking part 24 is formed in the sealing member 2 using processing methods, such as press processing.
- the lacking portion 24 may be formed on the sealing member 2 by cutting die processing or the like, and any processing method can be applied.
- the sealing member 2 and the case member 1 are fitted. Thereafter, the welded portions of the sealed sealing member 2 and case member 1 are irradiated with laser using a laser welding apparatus. As a result, a weld bead is formed at the welded portion between the sealing member 1 and the case member, and so-called keyhole welding is performed.
- ((increased thickness plate thickness L1) ⁇ (general face plate thickness L2)) is not less than 1/3 of the penetration depth A of the fusion zone 13, and ((increased thickness portion L3) -(Thickening gradually changing part L4)) is not more than the penetration depth A of the melting part 13, and (thickness part width L5) is not less than 1/3 of the penetration depth A, and the upper side of the melting part 13 is
- the welding energy of the laser welding apparatus is set so that it reaches the lacking portion 24 of the sealing member 2 and the lower side of the melting portion 13 is within the range of the thick portion 12 of the case member 1.
- battery containers mounted on electric cars, hybrid cars, portable terminals, and the like are required to have particularly high hermeticity. Even in such a case, by using the method for manufacturing a battery container according to the present embodiment, the battery container 10 with high sealing performance can be supplied to an electric vehicle, a hybrid car, a portable terminal, and the like.
- the lacking portion 24 is formed by notching the upper surface corner portion in the vicinity of the melting portion 13 with the lacking portion width L5 obliquely downward so as to have the curved corner portion 241.
- the thinned portion 31 may be formed by obliquely notching the top corner in the vicinity of the melted portion.
- the thinned portion 32 may be formed by cutting the upper surface downward in the vicinity of the melted portion 13 with the thinned portion width L5.
- the concave fitting part 23 is formed in the sealing member 2, it is not restricted to this, Even if it is the structure where a concave fitting part is not formed as shown in FIG. Good. In this case, the outer surface of the sealing member is joined to the inner surface of the case member.
- the lacking part 33 may be formed in the shape close
- the lacking portion 24 is formed in the vicinity of the melting portion 13 of the sealing member 2, but the lacking portion may be formed in the vicinity of the melting portion of the case member.
- the lacking portion 33 may be formed by cutting out in the horizontal direction with a lacking portion width L5 on the outer surface of the case member.
- the lacking portion 34 may be formed by obliquely notching the vicinity of the melted portion of the thick portion of the case member.
- the lacking portion 35 may be formed by notching the vicinity of the melted portion at the upper end corner of the thick portion of the case member.
- the welding heat is transmitted more intensively in the penetration depth direction, and a deeper penetration depth can be obtained with less welding energy.
- the lacking part formed in the sealing member 2 and the case member 1 which were mentioned above is an example, It is not restricted to this, for example, the said embodiment may be combined arbitrarily and will be arbitrary if it is a fusion
- the lacking part 24 is formed in the vicinity of the melting part 13 where the case member 1 and the sealing member 2 are melted and joined, and the upper side of the melting part 13 is the lacking part. It welds so that the part 24 may be reached. Thereby, welding heat is more intensively transmitted in the penetration depth direction, and a deeper penetration depth can be obtained with less welding energy. Therefore, it is possible to effectively reduce the loss of welding energy while greatly suppressing welding defects. Moreover, the intensity
- the present invention can be applied to, for example, a battery container that is required to have high hermeticity and is mounted on an electric vehicle, a hybrid car, a portable terminal, and the like.
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Abstract
Description
本発明は、このような問題点を解決するためになされたものであり、溶接を最適に行うことで、その信頼性を向上させた電池容器、及びその製造方法を提供することを主たる目的とする。
この一態様において、前記溶接ビームの照射方向における前記欠肉部の幅は、前記溶融部の溶込み深さの1/3以上であってもよい。
この一態様において、前記溶接ビームの照射方向に沿って、前記ケース部材若しくは前記封口部材の外部側に厚くなる厚肉部が形成され、前記溶融部が前記厚肉部の範囲内に収まるように前記溶接されてもよい。
この一態様において、前記厚肉部は、外側に徐々に厚さが増加する増肉徐変部と、該増肉徐変部に一体的に形成され厚さが一定の増肉一定部と、を有しており、前記増肉一定部の厚さから前記厚肉部以外の通常面の厚さを減算した値が前記溶融部の溶込み深さの1/3以上であってもよい。
この一態様において、前記厚肉部の高さから前記増肉徐変部の高さを減算した値が前記溶融部の溶込み深さ以下であってもよい。
この一態様において、前記欠肉部は、前記封口部材の外縁及びケース部材の開口のうち少なくとも一方に、前記外縁及び開口に沿って、溝状に全周又は断続的に形成されてもよい。
この一態様において、前記欠肉部は、前記封口部材の外縁に沿って、前記溶融部近傍で封口部材の上面角部を、曲面からなる隅部を有するように斜め下方に向かって切り欠いて形成されてもよい。
この一態様において、前記ケース部材と前記封口部材とはレーザ溶接により接合され密閉されてもよい。
他方、上記目的を達成するための本発明の一態様は、一方が開口したケース部材と、前記開口を塞ぐための封口部材と、を溶接により接合する電池容器の製造方法であって、前記ケース部材と封口部材とを接触させ溶接ビームを照射して溶融させる溶融部近傍に、欠肉部を形成するステップと、前記溶融部が前記欠肉部に到達するように前記溶接を行うステップと、を含む、ことを特徴とする電池容器の製造方法であってもよい。
この一態様において、前記溶接ビームの照射方向における前記欠肉部の幅は、前記溶融部の溶込み深さの1/3以上であってもよい。
この一態様において、前記ケース部材若しくは前記封口部材には、前記溶接ビームの照射方向に沿って、前記ケース部材若しくは前記封口部材の外部側に厚くなる厚肉部が形成されており、前記溶融部が前記厚肉部の範囲内に収まるように前記溶接されていてもよい。
まず、ケース部材1および封口部材2を生成する。そして、封口部材2に欠肉部24をプレス加工などの加工方法を用いて形成する。なお、欠肉部24は封口部材2に切削型加工などにより形成されてもよく、任意の加工方法を適用できる。
上記実施の形態において、欠肉部24は、溶融部13近傍で上面角部を、曲面の隅部241を有するように斜め下方に向かって欠肉部幅L5で切り欠いて形成されているが、これに限らず、例えば、図9に示す如く、欠肉部31は溶融部近傍で上面角部を斜めに切り欠いて形成してもよい。
2 封口部材
10 電池容器
11 開口部
12 厚肉部
13 溶融部
23 嵌合部
24 欠肉部
121 増肉徐変部
122 増肉一定部
241 隅部
Claims (11)
- 一方が開口したケース部材と、前記開口を塞ぐための封口部材と、を備える電池容器であって、
前記ケース部材と封口部材とを接触させ溶接ビームを照射して溶融させる溶融部近傍に、欠肉部が形成されており、
前記溶融部が前記欠肉部に到達するように、前記ケース部材と封口部材とが溶接されている、ことを特徴とする電池容器。 - 請求項1記載の電池容器であって、
前記溶接ビームの照射方向における前記欠肉部の幅は、前記溶融部の溶込み深さの1/3以上である、ことを特徴とする電池容器。 - 請求項1又は2記載の電池容器であって、
前記溶接ビームの照射方向に沿って、前記ケース部材若しくは前記封口部材の外部側に厚くなる厚肉部が形成され、
前記溶融部が前記厚肉部の範囲内に収まるように前記溶接される、ことを特徴とする電池容器。 - 請求項3記載の電池容器であって、
前記厚肉部は、外側に徐々に厚さが増加する増肉徐変部と、該増肉徐変部に一体的に形成され厚さが一定の増肉一定部と、を有しており、
前記増肉一定部の厚さから前記厚肉部以外の通常面の厚さを減算した値が前記溶融部の溶込み深さの1/3以上である、ことを特徴とする電池容器。 - 請求項4記載の電池容器であって、
前記厚肉部の高さから前記増肉徐変部の高さを減算した値が前記溶融部の溶込み深さ以下である、ことを特徴とする電池容器。 - 請求項1乃至5のうちいずれか1項記載の電池容器であって、
前記欠肉部は、前記封口部材の外縁及びケース部材の開口のうち少なくとも一方に、前記外縁及び開口に沿って、溝状に全周又は断続的に形成される、ことを特徴とする電池容器。 - 請求項1乃至6のうちいずれか1項記載の電池容器であって、
前記欠肉部は、前記封口部材の外縁に沿って、前記溶融部近傍で封口部材の上面角部を、曲面からなる隅部を有するように斜め下方に向かって切り欠いて形成される、
ことを特徴とする電池容器。 - 請求項1乃至7のうちいずれか1項記載の電池容器であって、
前記ケース部材と前記封口部材とはレーザ溶接により接合され密閉される、
を特徴とする電池容器。 - 一方が開口したケース部材と、前記開口を塞ぐための封口部材と、を溶接により接合する電池容器の製造方法であって、
前記ケース部材と封口部材とを接触させ溶接ビームを照射して溶融させる溶融部近傍に、欠肉部を形成するステップと、
前記溶融部が前記欠肉部に到達するように前記溶接を行うステップと、
を含む、ことを特徴とする電池容器の製造方法。 - 請求項9記載の電池容器の製造方法であって、
前記溶接ビームの照射方向における前記欠肉部の幅は、前記溶融部の溶込み深さの1/3以上である、ことを特徴とする電池容器の製造方法。 - 請求項9又は10記載の電池容器の製造方法であって、
前記ケース部材若しくは前記封口部材には、前記溶接ビームの照射方向に沿って、前記ケース部材若しくは前記封口部材の外部側に厚くなる厚肉部が形成されており、
前記溶融部が前記厚肉部の範囲内に収まるように前記溶接されている、ことを特徴とする電池容器の製造方法。
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