JP6136755B2 - Power storage device - Google Patents
Power storage device Download PDFInfo
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- JP6136755B2 JP6136755B2 JP2013172230A JP2013172230A JP6136755B2 JP 6136755 B2 JP6136755 B2 JP 6136755B2 JP 2013172230 A JP2013172230 A JP 2013172230A JP 2013172230 A JP2013172230 A JP 2013172230A JP 6136755 B2 JP6136755 B2 JP 6136755B2
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- lid
- case
- main body
- welding
- welded
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- 238000003860 storage Methods 0.000 title claims description 23
- 238000003466 welding Methods 0.000 claims description 80
- 229910052751 metal Inorganic materials 0.000 claims description 36
- 239000002184 metal Substances 0.000 claims description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 32
- 229910052782 aluminium Inorganic materials 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 22
- 238000003825 pressing Methods 0.000 claims description 11
- 239000007769 metal material Substances 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims description 2
- 229910001374 Invar Inorganic materials 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 5
- 239000011149 active material Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Description
本発明は、蓄電装置に係り、詳しくはケース本体の開口部を封止する蓋体がケース本体に溶接されている蓄電装置に関する。 The present invention relates to a power storage device, and more particularly to a power storage device in which a lid that seals an opening of a case body is welded to the case body.
二次電池やキャパシタのような蓄電装置は再充電が可能であり、繰り返し使用することができるため電源として広く利用されている。一般に、容量の大きな蓄電装置は電極組立体を収容するケースを備え、そのケース内に電極組立体が収容されている。従来、二次電池のケースは、ケース本体と蓋体とは別部品として構成され、電極組立体を収容した後、ケース本体の開口部を覆うように蓋体がレーザ溶接によりに密封状態で溶接される。ケース本体と蓋体とをレーザ溶接で溶接する場合、ケース本体と蓋体との境界に発生するピンホールやクラックが製品の歩留まりを低下させる。 Power storage devices such as secondary batteries and capacitors are widely used as power sources because they can be recharged and can be used repeatedly. In general, a power storage device with a large capacity includes a case for accommodating an electrode assembly, and the electrode assembly is accommodated in the case. Conventionally, the case of a secondary battery is configured as a separate part from the case body and the lid, and after the electrode assembly is accommodated, the lid is welded in a sealed state by laser welding so as to cover the opening of the case body Is done. When the case main body and the lid body are welded by laser welding, pinholes and cracks generated at the boundary between the case main body and the lid body reduce the product yield.
従来、ケース本体と蓋体との溶接部にできるピンホールやクラックの発生を防止するため、ケース本体（電池容器）の開口端に嵌着された蓋体（封口蓋）との接合部がレーザ溶接により密封された密閉型電池において、ケース本体と蓋体とが低炭素鋼材から成る密閉型電池が提案されている（特許文献１）。また、図８に示すように、角形外装缶（ケース本体）６１の開口部の内側に封口板（蓋体）６２をセットし、封口板６２と角形外装缶６１の境界に沿ってレーザを照射し、レーザの熱エネルギーで封口板６２と角形外装缶６１の境界を溶融して溶接する角形電池の製造方法が提案されている（特許文献２）。特許文献２では、角形外装缶６１の開口端面に放熱除去部６３を設けることにより、角形外装缶６１と封口板６２にアルミニウム又はアルミニウム合金を使用した場合でもクラックの発生を有効に阻止できるとしている。図８では、角形外装缶６１の開口端面を面取りして放熱除去部６３を設けている。 Conventionally, in order to prevent the occurrence of pinholes and cracks that can be formed in the welded portion between the case body and the lid body, the joint between the case body (battery container) and the lid body (sealing lid) fitted to the opening end of the case body is a laser. In a sealed battery sealed by welding, a sealed battery in which a case body and a lid are made of a low carbon steel material has been proposed (Patent Document 1). Also, as shown in FIG. 8, a sealing plate (lid body) 62 is set inside the opening of the rectangular outer can (case body) 61, and laser is irradiated along the boundary between the sealing plate 62 and the rectangular outer can 61. A method of manufacturing a rectangular battery in which the boundary between the sealing plate 62 and the rectangular outer can 61 is melted and welded with the thermal energy of a laser has been proposed (Patent Document 2). In Patent Document 2, by providing a heat radiation removal portion 63 on the opening end face of the rectangular outer can 61, even when aluminum or an aluminum alloy is used for the rectangular outer can 61 and the sealing plate 62, generation of cracks can be effectively prevented. . In FIG. 8, the open end face of the rectangular outer can 61 is chamfered to provide a heat removal part 63.
特許文献１の構成では、ケースの材質が低炭素鋼板に特定されてしまう。一方、特許文献２の構成ではケースがアルミニウム又はアルミニウム合金を使用した場合でも適用できる。しかし、特許文献２の方法は、蓋体をケース本体の開口部内に嵌合させた状態で、蓋体の上面を溶接する接合に限り、蓋体がケース本体の開口部を覆うようにケース本体の開口端に載置された状態で、溶接がケースの周面（側面）に沿って行われる場合に関しては配慮されていない。このような状態で蓋体をケース本体にレーザ溶接する場合、溶接はケース本体と蓋体との当接箇所にケースの周方向に沿ってレーザビームを照射することにより行われる。そのため、ケース本体と蓋体とが同一素材の場合、周溶接の途中で熱歪みを起こし、ケース本体と蓋体との突き合わせ精度が悪くなり、ケース本体と蓋体との間に隙間が生じ易い。隙間（一般的に０．１ｍｍ以上）があると、溶接部にピンホールが生じ易い。熱歪みの影響は、例えば、蓋体がケース本体の開口部を塞ぐ状態でケース本体の上側に配置された状態で、溶接がケースの周面（側面）に沿って行われる場合は、蓋体は上側に反る。 In the configuration of Patent Document 1, the material of the case is specified as a low carbon steel plate. On the other hand, the configuration of Patent Document 2 can be applied even when the case uses aluminum or an aluminum alloy. However, in the method of Patent Document 2, the case main body is configured so that the lid body covers the opening of the case body only in the joining in which the upper surface of the lid body is welded in a state where the lid body is fitted in the opening of the case body. No consideration is given to the case where welding is performed along the peripheral surface (side surface) of the case in a state of being placed on the open end of the case. When laser welding the lid body to the case body in such a state, the welding is performed by irradiating a laser beam along the circumferential direction of the case to a contact portion between the case body and the lid body. Therefore, when the case main body and the lid body are made of the same material, thermal distortion occurs during the circumferential welding, the accuracy of butting between the case main body and the lid body deteriorates, and a gap is easily generated between the case main body and the lid body. . If there is a gap (generally 0.1 mm or more), a pinhole is likely to occur in the weld. The influence of thermal strain is, for example, when the lid is placed on the upper side of the case body with the opening of the case body being closed and welding is performed along the peripheral surface (side surface) of the case. Warps upward.
本発明は、前記の問題に鑑みてなされたものであって、その目的は、ケース本体と蓋体とのビーム溶接時に蓋体が反って溶接不良が発生するのを抑制することができる蓄電装置を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a power storage device capable of suppressing the occurrence of poor welding due to warping of the lid during beam welding between the case body and the lid. Is to provide.
上記課題を解決する蓄電装置は、電極組立体を挿入可能な開口部を有するケース本体と、前記開口部を塞ぐ蓋体とで構成されたケース内に、前記電極組立体が収容されるとともに前記蓋体が前記開口部を塞ぐ状態で前記ケース本体に溶接された蓄電装置であって、前記蓋体は、前記蓋体の前記ケース本体への溶接時に、溶接に伴う熱により前記蓋体を前記ケース本体側に向かって押圧する方向に付勢する付勢手段を備えており、前記付勢手段は、バイメタル構造であり、前記蓋体は、前記ケース本体の開口部より外側に位置する本体部と、前記ケース本体の開口部内に位置するインロー部とを備え、前記ケース本体及び前記蓋体の本体部は同じ材質で形成され、前記インロー部が前記本体部と異なる材質で形成されて前記バイメタル構造が構成されている。 In a power storage device that solves the above problem, the electrode assembly is housed in a case that includes a case main body having an opening into which the electrode assembly can be inserted, and a lid that closes the opening. A power storage device welded to the case body in a state in which a lid closes the opening, and the lid is heated by welding heat when the lid is welded to the case body. A biasing means for biasing in the direction of pressing toward the case body side is provided, the biasing means has a bimetal structure, and the lid body is located outside the opening of the case body. And an inlay part located in the opening of the case body, the case body and the body part of the lid are made of the same material, and the inlay part is made of a material different from the body part, and the bimetal Structure It is.
蓋体とケース本体とをビーム溶接する際、ビーム照射位置は蓋体とケース本体との当接部の一端からケースの周面に沿って順に移動し、ビーム照射によって蓋体及びケース本体の当接部は、ビーム照射された部分から溶融して溶接される。蓋体はビーム照射された位置に近い部分ほど加熱される。また、ビーム照射で発生した熱が蓋体中を伝播するため、蓋体の溶接箇所以外の部分も加熱される。そして、溶接が進むに連れて未溶接部の熱膨張の割合が大きくなる。そして、蓋体全体が同一材質の場合、蓋体の内面側（ケース本体の開口端面側）の熱膨張割合が大きくなって、蓋体の未溶接部は蓋体の外面側がケース本体から離れる方向に反る。その結果、未溶接部にビームが照射された際に乱反射が生じて、溶接が良好に行われなくなって、ピンホールやクラックなどの溶接不良が発生する。しかし、蓋体は、蓋体のケース本体への溶接時に、溶接に伴う熱により蓋体をケース本体側に向かって押圧する方向に付勢する付勢手段を備えているため、ビーム溶接時に、溶接が進むに連れて未溶接部の熱膨張の割合が大きくなっても、付勢手段の作用により、蓋体がケース本体側に向かって押圧されるため、蓋体の反りが抑制され、ケース本体と蓋体とのビーム溶接時に蓋体が反って溶接不良が発生するのを抑制することができる。また、付勢手段として形状記憶合金を用いることも可能であるが、バイメタル構造の方が必要な付勢力が得られる材質の自由度が高く、構成も容易である。また、付勢手段としてのバイメタル構造を構成する材質のうち、線膨張係数の大きな材質が、ケース本体にビーム溶接される材質の場合、溶接時に支障なく蓋体とケース本体の溶接すべき箇所にビームが照射されてビーム溶接が行われる。
上記課題を解決する蓄電装置は、電極組立体を挿入可能な開口部を有するケース本体と、前記開口部を塞ぐ蓋体とで構成されたケース内に、前記電極組立体が収容されるとともに前記蓋体が前記開口部を塞ぐ状態で前記ケース本体に溶接された蓄電装置であって、前記蓋体は、前記蓋体の前記ケース本体への溶接時に、溶接に伴う熱により前記蓋体を前記ケース本体側に向かって押圧する方向に付勢する付勢手段を備えており、前記付勢手段は、バイメタル構造であり、前記ケース本体に溶接される前記蓋体の本体部の上側に、前記蓋体の本体部よりも線膨張率の大きな金属材が張り合わされて前記バイメタル構造が構成されている。
When beam welding the lid and the case body, the beam irradiation position moves sequentially along the peripheral surface of the case from one end of the contact portion between the lid and the case body, and the lid and case body are contacted by beam irradiation. The contact portion is melted and welded from the portion irradiated with the beam. The lid body is heated closer to the beam irradiated position. Moreover, since the heat generated by the beam irradiation propagates through the lid, the portions other than the welded portion of the lid are also heated. And the rate of thermal expansion of an unwelded part becomes large as welding progresses. When the entire lid is made of the same material, the thermal expansion rate on the inner surface side (opening end surface side of the case body) of the lid body is increased, and the unwelded portion of the lid body is away from the case body. Warp. As a result, irregular reflection occurs when the beam is irradiated to the unwelded portion, welding is not performed well, and welding defects such as pinholes and cracks occur. However, since the lid body includes a biasing means for biasing the lid body in the direction of pressing the lid body toward the case body side by heat accompanying welding when the lid body is welded to the case body, during beam welding, Even if the rate of thermal expansion of the unwelded part increases as welding progresses, the lid is pressed toward the case body by the action of the biasing means, so that the warping of the lid is suppressed, and the case It is possible to suppress the occurrence of poor welding due to warping of the lid during beam welding between the main body and the lid. Although a shape memory alloy can be used as the urging means, the bimetal structure has a higher degree of freedom in the material that can obtain the necessary urging force, and the configuration is easy. In addition, among the materials that make up the bimetal structure as the urging means, if the material with a large linear expansion coefficient is a material that is beam-welded to the case body, it should be placed at the location where the lid and case body should be welded without any problems during welding. Beam welding is performed by irradiating the beam.
In a power storage device that solves the above problem, the electrode assembly is housed in a case that includes a case main body having an opening into which the electrode assembly can be inserted, and a lid that closes the opening. A power storage device welded to the case body in a state in which a lid closes the opening, and the lid is heated by welding heat when the lid is welded to the case body. The urging means for urging in the direction of pressing toward the case main body side is provided, the urging means has a bimetal structure, and the upper side of the main body portion of the lid body welded to the case main body, A metal material having a linear expansion coefficient larger than that of the main body of the lid is laminated to constitute the bimetal structure.
前記ケース本体はアルミニウム系金属製であり、前記蓋体は前記ケース本体と溶接される部分がアルミニウム系金属製であることが好ましい。ここで、「アルミニウム系金属」とは、工業用純アルミニウム（例えば、Ａ１０００系アルミニウム）やアルミニウム合金（例えば、Ａ３０００系アルミニウム合金）等のようにアルミニウムを主成分とする金属を意味する。蓄電装置の軽量化のためにはケースを軽金属の中でも生産量が多く安価なアルミニウム系金属製とするのが好ましいが、単にケース本体と蓋体とをアルミニウム系金属製とした場合は、ビーム溶接中に蓋体の反りが発生して溶接不良が生じる場合がある。しかし、蓋体はケース本体と溶接される部分がアルミニウム系金属製であっても、付勢手段の作用によりビーム溶接中に蓋体の反りが抑制され、ケース本体と蓋体とのビーム溶接時に蓋体が反って溶接不良が発生するのを抑制することができる。 The case body is preferably made of an aluminum-based metal, and the lid body is preferably made of an aluminum-based metal at a portion welded to the case body. Here, the “aluminum-based metal” means a metal containing aluminum as a main component, such as industrial pure aluminum (for example, A1000-based aluminum) or an aluminum alloy (for example, A3000-based aluminum alloy). In order to reduce the weight of the power storage device, it is preferable that the case is made of an aluminum-based metal, which is a large amount of light metal and is cheap, but if the case body and the lid are simply made of an aluminum-based metal, beam welding is used. In some cases, warping of the lid occurs, resulting in poor welding. However, even if the lid is welded to the case body with an aluminum-based metal, the biasing means prevents the lid from warping during beam welding, and the case body and lid are It is possible to suppress the occurrence of poor welding due to warping of the lid.
本発明によれば、ケース本体と蓋体とのレーザ溶接時に蓋体が反って溶接不良が発生するのを抑制することができる。 ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a cover body warps at the time of laser welding of a case main body and a cover body, and a welding defect generate | occur | produces.
以下、二次電池に具体化した一実施形態を図１〜図３にしたがって説明する。
図１に示すように、蓄電装置としての二次電池１０は、ケース１１に積層型の電極組立体１２が収容されている。また、ケース１１には、電解液（図示せず）も収容されている。ケース１１は、有底四角筒状のケース本体１３と、ケース本体１３に電極組立体１２を挿入可能な開口部１３ａを塞ぐ蓋体１４とからなる。
Hereinafter, an embodiment embodied in a secondary battery will be described with reference to FIGS.
As shown in FIG. 1, a secondary battery 10 as a power storage device includes a case 11 in which a stacked electrode assembly 12 is accommodated. The case 11 also contains an electrolytic solution (not shown). The case 11 includes a case main body 13 having a bottomed square cylindrical shape and a lid body 14 that closes an opening 13 a into which the electrode assembly 12 can be inserted into the case main body 13.
電極組立体１２は、複数の矩形シート状の正極及び複数の矩形シート状の負極が、正極と負極との間にシート状のセパレータが存在する状態で積層されて構成されている。正極及び負極は、金属箔の両面に活物質が塗布された活物質層を有する部分が矩形状に形成され、活物質層が形成されていないタブ１２ｐ，１２ｎが突出形成されている。セパレータは、活物質層の幅より若干幅広に形成されている。二次電池１０がリチウムイオン二次電池の場合、正極用の金属箔はアルミニウム箔が好ましく、負極用の金属箔は銅箔が好ましい。 The electrode assembly 12 is configured by laminating a plurality of rectangular sheet-shaped positive electrodes and a plurality of rectangular sheet-shaped negative electrodes in a state where a sheet-shaped separator exists between the positive electrode and the negative electrode. In the positive electrode and the negative electrode, portions having an active material layer in which an active material is applied on both surfaces of a metal foil are formed in a rectangular shape, and tabs 12p and 12n on which no active material layer is formed are formed protrudingly. The separator is formed slightly wider than the width of the active material layer. When the secondary battery 10 is a lithium ion secondary battery, the metal foil for the positive electrode is preferably an aluminum foil, and the metal foil for the negative electrode is preferably a copper foil.
正極端子１５及び負極端子１６は、雄ねじ部１５ａ，１６ａ及び鍔部１５ｂ，１６ｂを有し、蓋体１４に形成された孔（図示せず）を、鍔部１５ｂ，１６ｂがケース１１の内側に位置する状態で貫通して蓋体１４から突出する雄ねじ部１５ａ，１６ａに螺合するナット１７により、蓋体１４に締め付け固定されている。正極端子１５及び負極端子１６は、複数の二次電池１０を電気的に接続するバスバー１８をボルト１９により締め付け固定可能に構成されている。 The positive electrode terminal 15 and the negative electrode terminal 16 have male screw portions 15 a and 16 a and flange portions 15 b and 16 b, and holes (not shown) formed in the lid body 14, and the flange portions 15 b and 16 b are formed inside the case 11. It is fastened and fixed to the lid body 14 by a nut 17 that is threadedly engaged with male screw portions 15a and 16a that penetrate through the cap body 14 and protrude from the lid body 14. The positive terminal 15 and the negative terminal 16 are configured such that a bus bar 18 that electrically connects the plurality of secondary batteries 10 can be fastened and fixed by bolts 19.
正極端子１５は鍔部１５ｂに接合された導電部材２０を介して電極組立体１２の正極のタブ１２ｐに電気的に接続されている。負極端子１６は鍔部１６ｂに接合された導電部材２１を介して電極組立体１２の負極のタブ１２ｎに電気的に接続されている。 The positive terminal 15 is electrically connected to the positive tab 12p of the electrode assembly 12 through the conductive member 20 joined to the flange 15b. The negative electrode terminal 16 is electrically connected to the negative electrode tab 12n of the electrode assembly 12 through a conductive member 21 bonded to the flange portion 16b.
なお、図１では図示を省略しているが、図２に示すように、ナット１７と蓋体１４との間には絶縁部材２２が設けられている。また、鍔部１５ｂ，１６ｂと蓋体１４との間には図示しない電気的絶縁材製のシール部材が介装されている。 Although not shown in FIG. 1, an insulating member 22 is provided between the nut 17 and the lid body 14 as shown in FIG. Further, a sealing member made of an electrically insulating material (not shown) is interposed between the flange portions 15b and 16b and the lid body 14.
次に蓋体について詳述する。
蓋体１４は、蓋体１４のケース本体１３への溶接時に、溶接に伴う熱により蓋体１４をケース本体１３側に向かって押圧する方向に付勢する付勢手段２５を備えている。この実施形態では、付勢手段２５は、蓋体１４をバイメタル構造とすることにより構成されている。詳述すると、図１に示すように蓋体１４は、ケース本体１３の開口部１３ａより外側に位置する本体部１４ａと、ケース本体１３の開口部１３ａ内に位置するインロー部１４ｂとを備えている。そして、ケース本体１３及び蓋体１４の本体部１４ａは同じ材質で形成され、インロー部１４ｂが本体部１４ａと異なる材質で形成されて付勢手段としてのバイメタルが構成されている。
Next, the lid will be described in detail.
The lid body 14 is provided with a biasing means 25 that biases the lid body 14 in a direction of pressing the lid body 14 toward the case body 13 side by heat accompanying welding when the lid body 14 is welded to the case body 13. In this embodiment, the biasing means 25 is configured by making the lid body 14 have a bimetal structure. Specifically, as shown in FIG. 1, the lid body 14 includes a main body portion 14 a positioned outside the opening portion 13 a of the case main body 13 and an inlay portion 14 b positioned in the opening portion 13 a of the case main body 13. Yes. The case main body 13 and the main body portion 14a of the lid body 14 are formed of the same material, and the inlay portion 14b is formed of a material different from that of the main body portion 14a to constitute a bimetal as an urging means.
この実施形態の二次電池１０は、リチウムイオン二次電池である。ケース本体１３及び蓋体１４の本体部１４ａは、アルミニウム系金属製である。アルミニウム系金属とは、アルミニウム又はアルミニウム合金を意味する。アルミニウム合金とは、例えば、アルミニウムを主成分とし、銅、マンガン、亜鉛、シリコン、マグネシウムなどが添加されたものを含み、熱処理型合金も含む。蓋体１４のインロー部１４ｂは、アルミニウム系金属より熱膨張率が低い金属製であり、この実施形態では組成がＦｅ６５ｗｔ％、Ｎｉ３５ｗｔ％のインバー合金が使用されている。インバー合金は金属の中で熱膨張率が非常に小さい金属であり、アルミニウムの線膨張係数が２３（×１０−６Ｋ−１）程度に対して、インバー合金の線膨張係数は１〜２（×１０−６Ｋ−１）程度である。 The secondary battery 10 of this embodiment is a lithium ion secondary battery. The main body portion 14a of the case main body 13 and the lid body 14 is made of an aluminum-based metal. An aluminum-based metal means aluminum or an aluminum alloy. The aluminum alloy includes, for example, aluminum as a main component and added with copper, manganese, zinc, silicon, magnesium, and the like, and also includes a heat treatment type alloy. The inlay part 14b of the lid 14 is made of a metal having a lower thermal expansion coefficient than that of an aluminum-based metal. In this embodiment, an invar alloy having a composition of Fe 65 wt% and Ni 35 wt% is used. Invar alloy is a metal having a very small thermal expansion coefficient among metals, and the linear expansion coefficient of aluminum is about 23 (× 10 −6 K −1 ), whereas the linear expansion coefficient of Invar alloy is 1 to 2 ( × 10 −6 K −1 )
次に前記のように構成されたケース１１内に電極組立体１２が収容された二次電池１０のケース本体１３と蓋体１４との溶接方法を説明する。
蓋体１４をケース本体１３に接合する場合、電極組立体１２をケース本体１３の開口部からケース本体１３内に挿入した後、蓋体１４をケース本体１３の開口部１３ａを塞ぐ状態に配置する。この状態では、図１に示すように、インロー部１４ｂがケース本体１３の開口部１３ａ内に位置し、図１及び図２に示すように、本体部１４ａの下面周縁がケース本体１３の上端面と当接した状態となる。その状態で、ケース本体１３と本体部１４ａとの当接部の周囲にレーザビームが照射されて、レーザ溶接が行われる。
Next, a method of welding the case body 13 and the lid body 14 of the secondary battery 10 in which the electrode assembly 12 is accommodated in the case 11 configured as described above will be described.
When the lid 14 is joined to the case body 13, the electrode assembly 12 is inserted into the case body 13 from the opening of the case body 13, and then the lid 14 is disposed so as to close the opening 13 a of the case body 13. . In this state, as shown in FIG. 1, the spigot part 14 b is located in the opening 13 a of the case main body 13, and the lower peripheral edge of the main body part 14 a is the upper end surface of the case main body 13 as shown in FIGS. 1 and 2. It will be in the state contacted. In this state, a laser beam is irradiated around the contact portion between the case main body 13 and the main body portion 14a, and laser welding is performed.
レーザビームの照射位置は、例えば、図２に矢印で示すように、ケース１１の一端側（図２の左端側）の最初の照射位置からケースの他端側（図２の右端側）に向かってケース本体１３と本体部１４ａとの周面に沿って移動する。そして、レーザビームの照射位置が、ケース１１の右端において、厚さ方向に移動された後、ケース１１の右端側から左端側に向かって移動され、左端において、厚さ方向に移動されることにより、ケース本体１３と本体部１４ａとの当接部が順次溶接される。 The laser beam irradiation position is, for example, from the first irradiation position on one end side (left end side in FIG. 2) of the case 11 to the other end side (right end side in FIG. 2) as indicated by an arrow in FIG. And move along the peripheral surfaces of the case main body 13 and the main body portion 14a. The laser beam irradiation position is moved in the thickness direction at the right end of the case 11, then moved from the right end side to the left end side of the case 11, and moved in the thickness direction at the left end. The contact portion between the case main body 13 and the main body portion 14a is sequentially welded.
蓋体１４はビーム照射された位置に近い部分ほど加熱される。また、ビーム照射で発生した熱が蓋体１４中を伝播するため、蓋体１４の溶接箇所以外の部分も加熱される。溶接が進むに連れて未溶接部の熱膨張の割合が大きくなる。そして、蓋体１４全体が同一材質の場合、蓋体１４の内面側（ケース本体１３の開口端面側）の熱膨張割合が大きくなって、図３（ｂ）に示すように、蓋体１４の未溶接部は蓋体１４の外面側がケース本体から離れる方向に反る。その結果、蓋体１４の本体部１４ａの未溶接の端面と、ケース本体１３の上端面との間に隙間が発生し、溶接すべき箇所にビームが照射された際に乱反射が生じて、溶接が良好に行われなくなって、ピンホールやクラックなどの溶接不良が発生する。 The cover body 14 is heated as it is closer to the beam irradiated position. Further, since the heat generated by the beam irradiation propagates through the lid body 14, portions other than the welded portion of the lid body 14 are also heated. As welding progresses, the rate of thermal expansion of the unwelded portion increases. When the entire lid 14 is made of the same material, the thermal expansion ratio on the inner surface side (opening end surface side of the case body 13) of the lid 14 is increased, and as shown in FIG. The unwelded portion warps in the direction in which the outer surface side of the lid body 14 is separated from the case main body. As a result, a gap is generated between the unwelded end surface of the main body portion 14a of the lid body 14 and the upper end surface of the case main body 13, and irregular reflection occurs when a beam is irradiated to a portion to be welded. Is not performed well, and welding defects such as pinholes and cracks occur.
しかし、この実施形態では、蓋体１４は、蓋体１４のケース本体１３への溶接時に、溶接に伴う熱により蓋体１４をケース本体１３側に向かって押圧する方向に付勢する付勢手段２５を備えている。そのため、ビーム溶接時に、溶接が進むに連れて未溶接部の熱膨張の割合が大きくなっても、付勢手段の作用により、蓋体１４がケース本体１３側に向かって押圧されるため、蓋体１４の反りが抑制され、ケース本体１３と蓋体１４とのビーム溶接時に蓋体１４が反って溶接不良が発生するのを抑制することができる。 However, in this embodiment, when the lid body 14 is welded to the case main body 13, the biasing means biases the lid body 14 in a direction of pressing the lid body 14 toward the case main body 13 side by heat accompanying welding. 25. For this reason, during beam welding, even if the rate of thermal expansion of the unwelded portion increases as welding progresses, the lid 14 is pressed toward the case body 13 by the action of the urging means. The warpage of the body 14 is suppressed, and it is possible to suppress the occurrence of poor welding due to the warpage of the lid body 14 during beam welding between the case body 13 and the lid body 14.
この実施形態によれば、以下に示す効果を得ることができる。
（１）二次電池１０（蓄電装置）は、電極組立体１２を挿入可能な開口部１３ａを有するケース本体１３と、開口部１３ａを塞ぐ蓋体１４とで構成されたケース１１内に、電極組立体１２が収容されるとともに蓋体１４が開口部１３ａを塞ぐ状態でケース本体１３に溶接された蓄電装置である。そして、蓋体１４は、蓋体１４のケース本体１３への溶接時に、溶接に伴う熱により蓋体１４をケース本体１３側に向かって押圧する方向に付勢する付勢手段２５を備えている。そのため、ビーム溶接時に、溶接が進むに連れて未溶接部の熱膨張の割合が大きくなっても、付勢手段２５の作用により、蓋体１４がケース本体１３側に向かって押圧される。したがって、ケース本体１３と蓋体１４とのレーザ溶接時に蓋体１４が反って溶接不良が発生するのを抑制することができる。
According to this embodiment, the following effects can be obtained.
(1) The secondary battery 10 (power storage device) includes an electrode in a case 11 including a case body 13 having an opening 13a into which the electrode assembly 12 can be inserted and a lid 14 that closes the opening 13a. This is a power storage device in which the assembly 12 is accommodated and welded to the case body 13 in a state where the lid 14 closes the opening 13a. And the cover body 14 is provided with the urging means 25 which urges | biases the cover body 14 to the direction which presses the cover body 14 toward the case main body 13 side with the heat accompanying welding at the time of welding to the case main body 13 of the cover body 14. . Therefore, at the time of beam welding, even if the rate of thermal expansion of the unwelded portion increases as welding progresses, the lid 14 is pressed toward the case body 13 by the action of the urging means 25. Therefore, it is possible to suppress the occurrence of poor welding due to warping of the lid 14 during laser welding of the case body 13 and the lid 14.
（２）ケース本体はアルミニウム系金属製であり、蓋体１４はケース本体１３と溶接される部分がアルミニウム系金属製である。二次電池１０の軽量化のためにはケース１１を軽金属の中でも生産量が多く安価なアルミニウム系金属製とするのが好ましいが、単にケース本体１３と蓋体１４とをアルミニウム系金属製とした場合は、ビーム溶接中に蓋体１４の反りが発生して溶接不良が生じる場合がある。しかし、蓋体１４はケース本体１３と溶接される部分がアルミニウム系金属製であって、付勢手段２５の作用によりビーム溶接中に蓋体１４の反りが抑制され、ケース本体１３と蓋体１４とのビーム溶接時に蓋体１４が反って溶接不良が発生するのを抑制することができる。 (2) The case main body is made of an aluminum-based metal, and the lid body 14 is made of an aluminum-based metal at a portion welded to the case main body 13. In order to reduce the weight of the secondary battery 10, it is preferable that the case 11 is made of an aluminum-based metal which is a large amount of light metal and is inexpensive, but the case body 13 and the lid body 14 are simply made of an aluminum-based metal. In some cases, the lid 14 may be warped during beam welding, resulting in poor welding. However, the lid body 14 is made of an aluminum-based metal at the portion to be welded to the case body 13, and the warping of the lid body 14 is suppressed during beam welding by the action of the urging means 25, and the case body 13 and the lid body 14. It is possible to suppress the occurrence of poor welding due to warping of the lid 14 during beam welding.
（３）付勢手段２５は、バイメタル構造である。付勢手段２５として形状記憶合金を用いることも可能であるが、バイメタル構造の方が必要な付勢力が得られる材質の自由度が高く、構成も容易である。 (3) The urging means 25 has a bimetal structure. Although it is possible to use a shape memory alloy as the urging means 25, the bimetal structure has a higher degree of freedom of the material from which the necessary urging force can be obtained, and the configuration is easy.
（４）蓋体１４は、ケース本体１３の開口部１３ａより外側に位置する本体部１４ａと、ケース本体１３の開口部１３ａ内に位置するインロー部１４ｂとを備え、ケース本体１３及び蓋体１４の本体部１４ａは同系統の材質で形成され、インロー部１４ｂが本体部１４ａと異なる材質で形成されてバイメタル構造が構成されている。この構成によれば、付勢手段２５としてのバイメタル構造を構成する材質のうち、線膨張係数の大きな材質が、ケース本体１３にビーム溶接される材質の場合、溶接時に支障なく蓋体１４とケース本体１３の溶接すべき箇所にビームが照射されてビーム溶接が行われる。 (4) The lid body 14 includes a main body portion 14 a located outside the opening portion 13 a of the case main body 13, and an inlay portion 14 b located within the opening portion 13 a of the case main body 13, and the case main body 13 and the lid body 14. The main body portion 14a is formed of the same material, and the inlay portion 14b is formed of a material different from that of the main body portion 14a to form a bimetal structure. According to this configuration, when the material having a large linear expansion coefficient among the materials constituting the bimetal structure as the urging means 25 is a material that is beam-welded to the case body 13, the lid 14 and the case can be used without any trouble during welding. Beam welding is performed by irradiating a beam on a portion of the main body 13 to be welded.
（５）バイメタル構造を構成する蓋体１４のインロー部１４ｂの材質にインバー合金が使用されている。インバー合金は金属の中でも線膨張係数が非常に小さいため、ビーム溶接時に、溶接が進むに連れて未溶接部の熱膨張の割合が大きくなっても蓋体１４をケース本体１３側に向かって押圧させるのに必要な付勢力を得るのに必要な使用量が少なくなる。 (5) Invar alloy is used for the material of the spigot part 14b of the lid body 14 constituting the bimetal structure. Invar alloy has a very small coefficient of linear expansion among metals, so during beam welding, the lid 14 is pressed toward the case body 13 even when the rate of thermal expansion of the unwelded portion increases as welding progresses. The amount of use necessary to obtain the urging force necessary to cause the reduction is reduced.
実施形態は前記に限定されるものではなく、例えば、次のように具体化してもよい。
○ 図４に示すように、インロー部１４ｂが複数に分割された構成としてもよい。インロー部１４ｂが１枚の板材で形成されている場合、ビーム溶接時に蓋体１４がバイメタルの作用によってケース本体１３側に向かって押圧される方向に付勢される際、即ち蓋体１４が外側に凸となるように湾曲する付勢力が作用する際、応力がかかり過ぎて溶接部の中央部に隙間が生じる可能性がある。しかし、インロー部１４ｂが複数に分割された構成の場合、そのような応力集中が緩和される。
The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 4, the inlay part 14b is good also as a structure divided | segmented into plurality. When the inlay portion 14b is formed of a single plate, when the lid 14 is urged toward the case body 13 by the action of the bimetal during beam welding, that is, the lid 14 is outside. When an urging force that curves so as to be convex acts, stress is applied excessively, and there is a possibility that a gap is formed in the central portion of the weld. However, when the inlay portion 14b is divided into a plurality of parts, such stress concentration is alleviated.
○ 図５に示すように、インロー部１４ｂの厚さを一定ではなく、溶接開始端側（図５における左端側）から溶接終了端側（図５における右端側）へ向かって次第に厚くなるように変化させてもよい。溶接中はビーム照射に伴いワークの温度が上昇し、温度上昇によりバイメタルの変形量が変わるため、それに対応してインロー部１４ｂの厚さを変更させるとよい。インロー部１４ｂの各部の厚さは、例えば、試験により溶接中の温度分布を測定し、その結果に基づいて本体部１４ａの各点における伸び量が一定になるように設定する。 As shown in FIG. 5, the thickness of the spigot part 14b is not constant, but gradually increases from the welding start end side (left end side in FIG. 5) toward the welding end end side (right end side in FIG. 5). It may be changed. During welding, the temperature of the workpiece rises with beam irradiation, and the amount of deformation of the bimetal changes due to the temperature rise. Therefore, it is preferable to change the thickness of the inlay portion 14b accordingly. The thickness of each part of the inlay part 14b is set such that, for example, the temperature distribution during welding is measured by a test, and the elongation amount at each point of the main body part 14a is constant based on the result.
○ 蓋体１４とケース本体１３とは、その溶接箇所がケース１１の周面となるように蓋体１４がケース本体１３と嵌合した状態で、レーザ溶接により接合された構成に限らない。例えば、図６に示すように、ケース本体１３の上端部内側に段差部が形成され、蓋体１４の本体部１４ａがその段差部に嵌合する状態で、蓋体１４とケース本体１３とが溶接により接合された構成であってもよい。この場合、溶接時に、ビームがケース１１の上方から本体部１４ａとケース本体１３との当接部に向かって照射される。 The lid body 14 and the case main body 13 are not limited to the configuration in which the lid body 14 is fitted to the case main body 13 and joined by laser welding so that the welded portion is the peripheral surface of the case 11. For example, as shown in FIG. 6, a stepped portion is formed inside the upper end portion of the case body 13, and the lid body 14 and the case body 13 are in a state where the body portion 14 a of the lid body 14 is fitted to the stepped portion. The structure joined by welding may be sufficient. In this case, at the time of welding, the beam is irradiated from above the case 11 toward the contact portion between the main body portion 14 a and the case main body 13.
○ 蓋体１４のケース本体１３への溶接時に、溶接に伴う熱により蓋体１４をケース本体１３側に向かって押圧する方向に付勢する付勢手段２５を構成するバイメタルは、図７に示すように、ケース本体１３に溶接される蓋体１４の本体部１４ａの上側に本体部１４ａより線膨張率の大きな金属材１４ｃが張り合わされた構成であってもよい。ケース本体１３及び蓋体１４の本体部１４ａがアルミニウム系金属製の場合、金属材１４ｃとして亜鉛が使用される。 The bimetal that constitutes the biasing means 25 that biases the lid body 14 in the direction of pressing the lid body 14 toward the case body 13 side by the heat accompanying welding when the lid body 14 is welded to the case body 13 is shown in FIG. Thus, the structure by which the metal material 14c with a larger linear expansion coefficient than the main-body part 14a was bonded together on the upper side of the main-body part 14a of the cover body 14 welded to the case main body 13 may be sufficient. When the case main body 13 and the main body portion 14a of the lid body 14 are made of an aluminum metal, zinc is used as the metal material 14c.
○ 本体部１４ａの上側に本体部１４ａより線膨張率の大きな金属材１４ｃが張り合わされた構成の蓋体１４を使用する場合、図６に示すように、ケース本体１３の上端部内側に段差部が形成され、蓋体１４の本体部１４ａがその段差部に嵌合する状態でケース本体１３に溶接される場合に適用してもよい。 ○ When using the lid 14 having a configuration in which a metal material 14c having a linear expansion coefficient larger than that of the main body 14a is bonded to the upper side of the main body 14a, as shown in FIG. May be applied to the case main body 13 in a state where the main body portion 14a of the lid body 14 is fitted to the stepped portion.
○ アルミニウム系金属と組み合わせてバイメタル構造を形成するための線膨張係数がアルミニウムより小さな金属はインバー合金に限らない。アルミニウムの線膨張係数（×１０−６Ｋ−１）は２３程度であり、一般的な金属の線膨張係数（×１０−６Ｋ−１）は、例えば、鉄で１２程度、ニッケルで１３程度、銅で１７程度、ステンレス鋼では種類によって異なり１０〜１７程度とアルミニウムより小さい。そのため、一般的な金属をアルミニウム系金属と組み合わせてバイメタル構造を形成する金属に使用することができる。 ○ A metal having a smaller linear expansion coefficient than aluminum for forming a bimetal structure in combination with an aluminum-based metal is not limited to an Invar alloy. Linear expansion coefficient of the aluminum (× 10 -6 K -1) is about 23, the linear expansion coefficient of a typical metal (× 10 -6 K -1), for example, about 12 iron, 13 about a nickel It is about 17 for copper and about 10 to 17 for stainless steel, which is smaller than aluminum. Therefore, a general metal can be used for the metal which forms a bimetal structure in combination with an aluminum-based metal.
○ インバー合金は、組成がＦｅ６５ｗｔ％、Ｎｉ３５ｗｔ％のものに限らず、Ｆｅの割合を減らしてＮｉの他にＣｏを含む所謂スーパーインバーであってもよい。
○ 蓋体１４のケース本体１３への溶接時に、溶接に伴う熱により蓋体１４をケース本体１３側に向かって押圧する方向に付勢する付勢手段は、バイメタル構造に限らず、例えば、形状記憶合金（感熱変形部材）であってもよい。例えば、溶接時の熱により蓋体１４が湾曲する方向と反対側に湾曲する形状に変形するように加工した形状記憶合金を蓋体１４の本体部１４ａに接合しておき、溶接時に形状記憶合金が湾曲形状になろうとする力と、本体部１４ａが熱膨張で湾曲しようとする力とが互いに打ち消し合うことで、蓋体１４の変形を防止する。
The invar alloy is not limited to Fe 65 wt% and Ni 35 wt%, but may be a so-called super invar containing Co in addition to Ni by reducing the proportion of Fe.
O When the lid 14 is welded to the case main body 13, the biasing means for biasing the lid 14 in the direction of pressing the lid 14 toward the case main body 13 by the heat accompanying welding is not limited to the bimetal structure, for example, the shape It may be a memory alloy (heat-sensitive deformable member). For example, a shape memory alloy processed so as to be deformed to a shape that curves in the direction opposite to the direction in which the lid body 14 is curved by heat during welding is joined to the body portion 14a of the lid body 14, and the shape memory alloy is welded during welding. The deformation of the lid body 14 is prevented by the force that the body portion 14a and the force that tends to bend due to thermal expansion cancel each other.
○ 蓋体１４のケース本体１３への溶接時に、溶接に伴う熱により蓋体１４をケース本体１３側に向かって押圧する方向に付勢する付勢手段を構成する部材は、本体部１４ａのケース本体１３との溶接箇所に沿って線状に設けてもよい。 The member constituting the biasing means for biasing the lid body 14 in the direction of pressing the lid body 14 toward the case body 13 side by the heat accompanying welding when the lid body 14 is welded to the case body 13 is the case of the body portion 14a. You may provide linearly along the welding location with the main body 13. FIG.
○ 蓋体１４のケース本体１３への溶接時に、溶接に伴う熱により蓋体１４をケース本体１３側に向かって押圧する方向に付勢する付勢手段を構成する部材は、金属に限らずセラミックであってもよい。 The member constituting the biasing means for biasing the lid body 14 in the direction of pressing the lid body 14 toward the case body 13 side by the heat accompanying welding at the time of welding the lid body 14 to the case body 13 is not limited to metal. It may be.
○ ケース本体１３及び蓋体１４の本体部１４ａは、アルミニウム系金属製に限らず、例えば、ステンレス鋼製であってもよい。
○ 蓋体１４はケース本体１３の開口部に嵌合された状態でケース本体１３に溶接された構造に限らず、開口部と嵌合せずにケース本体１３の開口側端面に載置された状態でケース本体１３に溶接された構造であってもよい。
The main body 14a of the case main body 13 and the lid body 14 is not limited to aluminum-based metal but may be made of stainless steel, for example.
The lid 14 is not limited to the structure welded to the case body 13 in a state of being fitted to the opening of the case body 13, but is mounted on the opening side end surface of the case body 13 without being fitted to the opening. The structure may be welded to the case body 13.
○ ビーム溶接は、レーザ溶接に限らず、電子ビーム溶接であってもよい。
○ 電極組立体１２は積層型に限らず、巻回型であってもよい。
○ 二次電池１０は電解液が必須ではなく、電解質として電解液を使用する構成であっても、電解液を使用せずに固体電解質や高分子電解質を使用する構成であってもよい。
○ Beam welding is not limited to laser welding, but may be electron beam welding.
The electrode assembly 12 is not limited to the laminated type, and may be a wound type.
The secondary battery 10 does not require an electrolytic solution, and may be configured to use an electrolytic solution as an electrolyte, or may be configured to use a solid electrolyte or a polymer electrolyte without using an electrolytic solution.
○ 蓄電装置は、二次電池１０に限らず、例えば、電気二重層キャパシタやリチウムイオンキャパシタ等のようなキャパシタであってもよい。
以下の技術的思想（発明）は前記実施形態から把握できる。
The power storage device is not limited to the secondary battery 10 and may be a capacitor such as an electric double layer capacitor or a lithium ion capacitor.
The following technical idea (invention) can be understood from the embodiment.
（１）請求項３又は請求項４に記載の発明において、前記バイメタル構造は、前記蓋体の前記ケース本体とビーム溶接される本体部と、前記本体部の前記ケース本体と溶接される側と反対側の面に接合された金属とで構成され、前記金属としてインバー合金が使用されている。 (1) In the invention according to claim 3 or claim 4, the bimetal structure includes a main body portion that is beam-welded to the case main body of the lid body, and a side of the main body portion that is welded to the case main body. It is comprised with the metal joined to the surface of the other side, and an invar alloy is used as said metal.
（２）電極組立体を挿入可能な開口部を有するケース本体内に前記電極組立体を収容した状態で、蓋体を前記開口部を塞ぐ位置に配置し、前記蓋体を前記ケース本体にビーム溶接する蓄電装置の蓋体とケース本体との溶接方法において、
前記蓋体の前記ケース本体への溶接時に、溶接に伴う熱により前記蓋体が前記ケース本体側に向かって押圧される方向に付勢された状態でビーム溶接を行うことを特徴とする蓄電装置の蓋体とケース本体との溶接方法。
(2) In a state where the electrode assembly is accommodated in a case main body having an opening into which the electrode assembly can be inserted, a lid is disposed at a position closing the opening, and the lid is beamed to the case main body. In the welding method between the lid of the power storage device to be welded and the case body,
A power storage device characterized in that beam welding is performed in a state where the lid is biased in a direction in which the lid is pressed toward the case body by heat accompanying welding when the lid is welded to the case body. Method of welding the lid body and case body.
１０…蓄電装置としての二次電池、１１…ケース、１２…電極組立体、１３…ケース本体、１３ａ…開口部、１４…蓋体、１４ａ…本体部、１４ｂ…インロー部、２５…付勢手段。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery as an electrical storage device, 11 ... Case, 12 ... Electrode assembly, 13 ... Case main body, 13a ... Opening part, 14 ... Cover body, 14a ... Main body part, 14b ... Inlay part, 25 ... Energizing means .
Claims (3)
前記蓋体は、前記蓋体の前記ケース本体への溶接時に、溶接に伴う熱により前記蓋体を前記ケース本体側に向かって押圧する方向に付勢する付勢手段を備えており、
前記付勢手段は、バイメタル構造であり、
前記蓋体は、前記ケース本体の開口部より外側に位置する本体部と、前記ケース本体の開口部内に位置するインロー部とを備え、前記ケース本体及び前記蓋体の本体部は同じ材質で形成され、前記インロー部が前記本体部と異なる材質で形成されて前記バイメタル構造が構成されていることを特徴とする蓄電装置。 A state in which the electrode assembly is housed and the lid closes the opening in a case composed of a case body having an opening into which the electrode assembly can be inserted and a lid that closes the opening. And a power storage device welded to the case body,
The lid includes biasing means for biasing the lid in a direction of pressing the lid toward the case body by heat accompanying welding when the lid is welded to the case body .
The biasing means has a bimetallic structure,
The lid includes a main body located outside the opening of the case main body and an inlay portion located in the opening of the case main body, and the main body of the case main body and the lid is formed of the same material. The storage device is characterized in that the inlay part is formed of a material different from that of the main body part to constitute the bimetal structure .
前記蓋体は、前記蓋体の前記ケース本体への溶接時に、溶接に伴う熱により前記蓋体を前記ケース本体側に向かって押圧する方向に付勢する付勢手段を備えており、 The lid includes biasing means for biasing the lid in a direction of pressing the lid toward the case body by heat accompanying welding when the lid is welded to the case body.
前記付勢手段は、バイメタル構造であり、 The biasing means has a bimetallic structure,
前記ケース本体に溶接される前記蓋体の本体部の上側に、前記蓋体の本体部よりも線膨張率の大きな金属材が張り合わされて前記バイメタル構造が構成されていることを特徴とする蓄電装置。 A power storage device characterized in that the bimetal structure is configured by laminating a metal material having a larger linear expansion coefficient than the main body of the lid on the upper side of the main body of the lid that is welded to the case main body. apparatus.
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