JP2015133180A - Method of manufacturing sealed power storage device and welding state inspection apparatus of case of sealed power storage device - Google Patents
Method of manufacturing sealed power storage device and welding state inspection apparatus of case of sealed power storage device Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 61
- 238000007689 inspection Methods 0.000 title claims abstract description 54
- 238000003860 storage Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims description 33
- 230000007547 defect Effects 0.000 abstract description 21
- 239000007789 gas Substances 0.000 description 14
- 239000001307 helium Substances 0.000 description 10
- 229910052734 helium Inorganic materials 0.000 description 10
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 230000035515 penetration Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 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
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000652 nickel hydride Inorganic materials 0.000 description 1
- -1 nickel metal hydride Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- 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
Abstract
Description
本発明は、密閉型蓄電装置の製造方法及び密閉型蓄電装置のケースの溶接状態検査装置に関する。 The present invention relates to a method for manufacturing a sealed power storage device and a welding state inspection device for a case of a sealed power storage device.
リチウムイオン電池やニッケル水素電池あるいはリチウムイオンキャパシタなどの密閉型蓄電装置の場合、その気密性が十分に確保されていないと、電解液が蓄電装置の外部に漏れ出し、サイクル寿命特性に大きな影響を及ぼす虞がある。電解液の漏洩を防止し、蓄電装置の性能を長期にわたって維持するために、密閉型電池の気密性を検査し、気密不良品を排除する必要がある。密閉型電池の気密性を検査する方法として、様々な方法が提案されている。 In the case of a sealed power storage device such as a lithium ion battery, a nickel metal hydride battery, or a lithium ion capacitor, if the airtightness is not sufficiently secured, the electrolyte leaks out of the power storage device, greatly affecting the cycle life characteristics. There is a risk of effect. In order to prevent leakage of the electrolyte and maintain the performance of the power storage device for a long period of time, it is necessary to inspect the hermeticity of the sealed battery and eliminate defective products. Various methods have been proposed as methods for inspecting the hermeticity of a sealed battery.
そして、特許文献１には、電池ケースに安全弁が設けられた密閉型電池では、電池内圧と電池外圧との圧力差が所定の作動圧を超えると、その圧力差を解放すべく安全弁が作動してしまうため、電池ケース内外の圧力差を大きくして検査を行うことができず、極微小な気密不良部分を検出できない従来の方法の問題を解決する方法が提案されている。 In Patent Document 1, in a sealed battery in which a safety valve is provided in a battery case, when the pressure difference between the battery internal pressure and the battery external pressure exceeds a predetermined operating pressure, the safety valve operates to release the pressure difference. For this reason, there has been proposed a method for solving the problems of the conventional method in which the pressure difference between the inside and outside of the battery case cannot be increased and the inspection cannot be performed, and the extremely small airtight portion cannot be detected.
特許文献１における気密検査方法は、電池ケースの外周のうち、安全弁を含む所定部位を、弁包囲部材で気密に包囲する。そして、安全弁に内側からかかる電池内圧と、安全弁に外側からかかる弁部外圧との圧力差を、安全弁の作動圧以下としつつ、電池ケース内に気体を圧入して電池内圧を上昇させると共に、弁包囲部材内にも気体を圧入して弁部外圧を上昇させた状態で、電池外部に漏れ出る気体の有無を検知して、密閉型電池の気密性を検査する。 In the airtight inspection method in Patent Document 1, a predetermined portion including a safety valve is hermetically surrounded by a valve surrounding member in the outer periphery of the battery case. The pressure difference between the internal pressure of the battery applied to the safety valve from the inside and the external pressure of the valve portion applied to the safety valve from the outside is set to be equal to or lower than the operating pressure of the safety valve, and gas is injected into the battery case to increase the battery internal pressure. In a state in which gas is also injected into the surrounding member to increase the external pressure of the valve portion, the presence or absence of gas leaking outside the battery is detected, and the hermeticity of the sealed battery is inspected.
また、密閉型蓄電装置の製造工程の一工程としてケース本体と蓋体とを溶接する封缶溶接工程がある。封缶溶接工程では、ピンホールの有無を確認するため、溶接後にケース内に空圧をかけて気密検査を行う。 Further, there is a sealed can welding process for welding the case main body and the lid body as one process of the manufacturing process of the sealed power storage device. In the sealed can welding process, airtight inspection is performed by applying air pressure in the case after welding in order to confirm the presence or absence of pinholes.
溶接欠陥の検査を気密検査で行う場合、溶接欠陥がピンホールのように、孔があいていれば検出可能である。しかし、溶接欠陥にはピンホールだけでなく溶接箇所が薄皮１枚程度の部分もあり、その溶接欠陥は気密検査では検出できない虞がある。 When the inspection of the welding defect is performed by an airtight inspection, it can be detected if the welding defect has a hole such as a pinhole. However, the weld defect includes not only a pinhole but also a portion where the weld location is about one thin skin, and the weld defect may not be detected by the airtight inspection.
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、ピンホールだけでなく薄皮１枚程度の溶接欠陥も検出することができる密閉型蓄電装置の製造方法及び密閉型蓄電装置のケースの溶接状態検査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 method for manufacturing a sealed power storage device capable of detecting not only a pinhole but also a welding defect of about one thin skin, and a sealed power storage. It is providing the welding condition inspection apparatus of the case of an apparatus.
上記課題を解決する密閉型蓄電装置の製造方法は、ケース本体と蓋体とを溶接する溶接工程以降に、前記ケース本体と前記蓋体との溶接箇所に、前記ケース本体の側壁に、前記側壁をケース外側へ付勢する第１の付勢力及び前記側壁をケース内側へ付勢する第２の付勢力の少なくとも一方を加えて前記側壁を一時的に変形させる状態と、前記側壁の変形が解消された状態とを繰り返す負荷をかけて、前記溶接箇所の気密検査を行うケースの溶接状態検査工程を有する。 A method of manufacturing a sealed power storage device that solves the above problems includes a welding step of welding a case main body and a lid body, a welded portion between the case main body and the lid body, a side wall of the case main body, the side wall A state in which the side wall is temporarily deformed by applying at least one of a first urging force for urging the outer side of the case and a second urging force for urging the side wall toward the inner side of the case, and the deformation of the side wall is eliminated. And a welding state inspection step for a case in which an airtight inspection of the welded portion is performed by applying a load that repeats the performed state.
この構成によれば、溶接箇所の気密検査を行うケースの溶接状態検査工程において、ケース本体の側壁に、側壁をケース外側へ付勢する第１の付勢力及び側壁をケース内側へ付勢する第２の付勢力の少なくとも一方を加えて側壁を一時的に変形させる状態と、側壁の変形が解消された状態とを繰り返す負荷をかける。そのため、薄皮１枚程度の溶接欠陥箇所は、気密検査を行う際にはピンホールあるいは亀裂が生じた状態となり、気密検査で検出される。したがって、ピンホールだけでなく薄皮１枚程度の溶接欠陥も検出することができる。 According to this configuration, in the welding state inspection process of the case for performing the airtight inspection of the welded portion, the first urging force for urging the side wall toward the outside of the case and the side wall urging the side wall toward the inside of the case are performed. The load which repeats the state which adds at least one of 2 urging | biasing force, and deform | transforms a side wall temporarily, and the state by which the deformation | transformation of the side wall was eliminated is applied. Therefore, a weld defect portion of about one thin skin is in a pinhole or cracked state when performing an airtight inspection, and is detected by the airtight inspection. Therefore, it is possible to detect not only a pinhole but also a welding defect of about one thin skin.
上記課題を解決する密閉型蓄電装置の溶接状態検査装置は、ケース本体と蓋体とが溶接された密閉型蓄電装置のケースの溶接箇所の気密検査を行う。そして、前記ケース本体の側壁に、前記側壁をケース外側へ付勢する第１の付勢力及び前記側壁をケース内側へ付勢する第２の付勢力の少なくとも一方を加えて前記側壁を一時的に変形させる状態と、前記側壁の変形が解消された状態を繰り返す負荷を加える圧力付与手段を備えている。 A welded state inspection device for a sealed power storage device that solves the above-described problem performs an airtight inspection of a welded portion of a case of a sealed power storage device in which a case body and a lid are welded. Then, by adding at least one of a first urging force for urging the side wall to the outside of the case and a second urging force for urging the side wall to the inside of the case to the side wall of the case body, the side wall is temporarily Pressure applying means for applying a load that repeats the state of deformation and the state in which the deformation of the side wall is eliminated is provided.
この構成によれば、ケースの溶接箇所の気密検査を行う際に、圧力付与手段により、ケース本体の側壁に、側壁をケース外側へ付勢する第１の付勢力及び側壁をケース内側へ付勢する第２の付勢力の少なくとも一方を加えて側壁を一時的に変形させる状態と、側壁の変形が解消された状態を繰り返す負荷が加えられる。そのため、薄皮１枚程度の溶接欠陥箇所は、気密検査を行う際にはピンホールあるいは亀裂が生じた状態となり、気密検査で検出される。したがって、ピンホールだけでなく薄皮１枚程度の溶接欠陥も検出することができる。 According to this configuration, when performing an airtight inspection of the welded portion of the case, the first biasing force for biasing the side wall toward the outside of the case and the side wall toward the inside of the case are biased to the side wall of the case body by the pressure applying means. A load is applied that repeats a state in which the side wall is temporarily deformed by applying at least one of the second urging forces and a state in which the side wall has been deformed. Therefore, a weld defect portion of about one thin skin is in a pinhole or cracked state when performing an airtight inspection, and is detected by the airtight inspection. Therefore, it is possible to detect not only a pinhole but also a welding defect of about one thin skin.
本発明によれば、ピンホールだけでなく薄皮１枚程度の溶接欠陥も検出することができる。 According to the present invention, it is possible to detect not only a pinhole but also a welding defect of about one thin skin.
以下、本発明を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。
密閉型蓄電装置の製造方法は、ケース本体と蓋体とを溶接する溶接工程以降に、溶接箇所の気密検査を行うケースの溶接状態検査工程を有する。溶接状態検査工程は、ケース本体と蓋体との溶接箇所に、ケース本体の側壁に、側壁をケース外側へ付勢する第１の付勢力及び側壁をケース内側へ付勢する第２の付勢力の少なくとも一方を加えて側壁を一時的に変形させる状態と、前記側壁の変形が解消された状態とを繰り返す負荷をかけて、溶接箇所の気密検査を行う。この実施形態においては、溶接状態検査工程をケース本体と蓋体との溶接工程の直後に行う。溶接工程の直後とは、ケース本体と蓋体との溶接後に行われる次の工程、例えば、電解液の注入工程や安全弁の取付け工程などが行われる前を意味する。
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
The method for manufacturing a sealed power storage device includes a welding state inspection process of a case in which a hermetic inspection of a welded portion is performed after the welding process of welding the case body and the lid. The welding state inspection step includes a first urging force for urging the side wall toward the outside of the case and a second urging force for urging the side wall toward the inside of the case at the welded portion between the case main body and the lid. The welded portion is subjected to an airtight inspection by applying a load that repeats a state in which the side wall is temporarily deformed by adding at least one of the above and a state in which the deformation of the side wall is eliminated. In this embodiment, the welding state inspection process is performed immediately after the welding process of the case body and the lid. Immediately after the welding process means before the next process performed after welding of the case body and the lid, for example, before the electrolyte injection process or the safety valve mounting process.
図１に示すように、蓄電装置としての二次電池１０は、ケース本体１１ａに電極組立体１２が収容された状態で、蓋体１１ｂがケース本体１１ａの開口部を覆うように溶接される。この時点では、蓋体１１ｂには電解液をケース１１内に注入する注液孔１３が形成されており、図示しない安全弁取付孔も形成されている。また、蓋体１１ｂには、電極組立体１２に電気的に接続された正極端子１４及び負極端子１５が固定されている。ケース１１は、例えば、アルミニウム又はアルミニウム合金製であり、二次電池１０は、例えば、リチウムイオン電池である。 As shown in FIG. 1, the secondary battery 10 as a power storage device is welded so that the lid 11b covers the opening of the case body 11a in a state where the electrode assembly 12 is accommodated in the case body 11a. At this point, a liquid injection hole 13 for injecting the electrolyte into the case 11 is formed in the lid 11b, and a safety valve mounting hole (not shown) is also formed. A positive terminal 14 and a negative terminal 15 electrically connected to the electrode assembly 12 are fixed to the lid 11b. The case 11 is made of, for example, aluminum or an aluminum alloy, and the secondary battery 10 is, for example, a lithium ion battery.
ケース本体１１ａと蓋体１１ｂとの溶接箇所に負荷をかける作業は、ケース本体１１ａの面積が広い方の一対の側壁１１ｃに、圧力付与手段によって付勢力を加えることにより行われる。ケース本体１１ａと蓋体１１ｂとが溶接されたケース１１の溶接箇所の気密検査を行うケースの溶接状態検査装置は、ケース本体１１ａの側壁１１ｃに負荷をかける圧力付与手段を備えている。図１及び図２（ａ），（ｂ）に示すように、圧力付与手段は、対向する状態で配置され、かつケース１１の側壁１１ｃを吸着可能な吸着部としての真空パッド１６を、側壁１１ｃをケース外側へ付勢する第１の方向と、ケース内側へ付勢する第２の方向とに図示しない駆動部により往復直線移動させる構成となっている。真空パッド１６は可撓性のパイプ１７を介して図示しない真空源に接続されている。パイプ１７の途中には図示しない電磁弁が設けられ、電磁弁により真空パッド１６内が減圧（真空）状態と、減圧解除状態とに調整されるようになっている。真空パッド１６を往復移動させる駆動部は、例えば、エアシリンダで構成され、ピストンロッドの先端がブラケットを介してパイプ１７に固定されている。 The operation of applying a load to the welded portion between the case main body 11a and the lid 11b is performed by applying a biasing force to the pair of side walls 11c having a larger area of the case main body 11a by pressure applying means. A welding state inspection apparatus for a case that performs an airtight inspection of a welded portion of the case 11 where the case body 11a and the lid body 11b are welded includes a pressure applying unit that applies a load to the side wall 11c of the case body 11a. As shown in FIGS. 1 and 2 (a), 2 (b), the pressure applying means is arranged in a state of being opposed to each other, and the vacuum pad 16 as an adsorbing portion that can adsorb the side wall 11c of the case 11 is connected to the side wall 11c. Is configured to reciprocate linearly by a drive unit (not shown) in a first direction for urging the outer side of the case and a second direction for urging the inner side of the case. The vacuum pad 16 is connected to a vacuum source (not shown) through a flexible pipe 17. An electromagnetic valve (not shown) is provided in the middle of the pipe 17 so that the inside of the vacuum pad 16 is adjusted to a reduced pressure (vacuum) state and a reduced pressure release state by the electromagnetic valve. The drive unit for reciprocating the vacuum pad 16 is constituted by an air cylinder, for example, and the tip of the piston rod is fixed to the pipe 17 via a bracket.
そして、ケース本体１１ａと蓋体１１ｂとの溶接箇所に負荷をかける作業は、図１に示すように、真空パッド１６が側壁１１ｃの中央に吸着された状態で往復移動されることにより行われる。対向する両真空パッド１６の間隔が拡がる方向へ真空パッド１６が移動されると、図２（ａ）に示すように、側壁１１ｃは外側に凸となるように撓み、両真空パッド１６の間隔が狭くなる方向へ真空パッド１６が移動されると、図２（ｂ）に示すように、側壁１１ｃは内側に凸となるように撓む。そして、両真空パッド１６が予め設定された回数往復移動されて、溶接箇所に負荷をかける作業が終了する。なお、負荷の大きさは、側壁１１ｃの撓み量（変形量）が、製品となった二次電池１０の充放電時における発熱に伴う側壁１１ｃの変形量より小さな変形量となるように設定される。 And the operation | work which applies a load to the welding location of the case main body 11a and the cover body 11b is performed by reciprocating in the state which the vacuum pad 16 was adsorb | sucked to the center of the side wall 11c, as shown in FIG. When the vacuum pad 16 is moved in the direction in which the distance between the opposing vacuum pads 16 increases, the side wall 11c bends outwardly as shown in FIG. 2A, and the distance between the two vacuum pads 16 increases. When the vacuum pad 16 is moved in the narrowing direction, as shown in FIG. 2B, the side wall 11c is bent so as to protrude inward. Then, both vacuum pads 16 are reciprocated a preset number of times, and the work of applying a load to the welding location is completed. The magnitude of the load is set so that the amount of deformation (deformation amount) of the side wall 11c is smaller than the amount of deformation of the side wall 11c due to heat generation during charging and discharging of the secondary battery 10 that is the product. The
溶接部の疲労強度は、溶接部の溶込量によって、破壊に至るまで反復回数の自然対数に比例する。そして、溶接部の溶込量と破壊に至るまでの負荷の反復回数との関係は、溶接部の溶込量の小さな状態では、図３に示すように比例関係にある。そこで、図３において比例関係となる範囲で溶込量の小さな反復回数、真空パッド１６を往復移動させて負荷を加えた後、気密検査を行う。この実施形態では、往復回数を１０回（往復）とした。 The fatigue strength of the weld is proportional to the natural logarithm of the number of iterations until failure occurs, depending on the amount of penetration of the weld. Then, the relationship between the penetration amount of the welded portion and the number of repetitions of the load until destruction is in a proportional relationship as shown in FIG. 3 when the penetration amount of the welded portion is small. Therefore, the airtight inspection is performed after applying the load by reciprocating the vacuum pad 16 for a small number of repetitions of the penetration amount within the range of the proportional relationship in FIG. In this embodiment, the number of reciprocations is 10 (reciprocation).
ケース本体１１ａと蓋体１１ｂとの溶接箇所に、予め設定された所定回数負荷が加えられた場合、溶接箇所に薄皮１枚程度の溶接欠陥が存在すると、その部分にピンホールあるいは亀裂が生じる。その結果、溶接箇所に薄皮１枚程度の溶接欠陥が存在した場合は、その後の気密検査において気密不良と判断されることになる。所定回数負荷が加えられた後、注液孔１３や安全弁取付孔などを塞いだ状態で気密検査が行われる。 When a predetermined number of preset loads are applied to the welded portion of the case main body 11a and the lid 11b, if there is a weld defect of about one thin skin at the welded portion, a pinhole or a crack is generated in that portion. As a result, if there is a weld defect of about one thin skin at the weld location, it will be judged as a poor airtightness in the subsequent airtight inspection. After the load is applied a predetermined number of times, an airtight inspection is performed with the liquid injection hole 13 and the safety valve mounting hole closed.
気密検査は、例えば、ケース１１内にヘリウムガスを充填した状態で、ケース１１を真空チャンバ内に収容する。そして、真空チャンバ内を減圧した後、ヘリウムガス検知器により真空チャンバ内のヘリウムガス濃度を検知する。ヘリウムガス検知器によりヘリウムガスが検知されればケース本体１１ａと蓋体１１ｂとの溶接箇所に溶接欠陥があると判断する。 In the airtight inspection, for example, the case 11 is accommodated in the vacuum chamber while the case 11 is filled with helium gas. Then, after reducing the pressure in the vacuum chamber, the helium gas detector detects the helium gas concentration in the vacuum chamber. If helium gas is detected by the helium gas detector, it is determined that there is a welding defect at the welded portion between the case main body 11a and the lid 11b.
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）密閉型蓄電装置（二次電池１０）の製造方法は、ケース本体１１ａと蓋体１１ｂとを溶接する溶接工程以降に、溶接箇所の気密検査を行うケース１１の溶接状態検査工程を有する。溶接状態検査工は、ケース本体１１ａと蓋体１１ｂとの溶接箇所に、ケース本体１１ａの側壁１１ｃに、側壁１１ｃをケース外側へ付勢する第１の付勢力及び側壁１１ｃをケース内側へ付勢する第２の付勢力の少なくとも一方を加えて側壁１１ｃを一時的に変形させる状態と、側壁１１ｃの変形が解消された状態とを繰り返す負荷をかけて、溶接箇所の気密検査を行う。この構成によれば、ピンホールだけでなく薄皮１枚程度の溶接欠陥も検出することができる。
According to this embodiment, the following effects can be obtained.
(1) The manufacturing method of the sealed power storage device (secondary battery 10) includes a welding state inspection process of the case 11 for performing an airtight inspection of the welded portion after the welding process of welding the case main body 11a and the lid body 11b. . The welding state inspector urges the side wall 11c of the case body 11a to the welded portion between the case body 11a and the lid body 11b, the first urging force for urging the side wall 11c to the outside of the case, and the side wall 11c to the inside of the case. The welded portion is subjected to an airtight inspection by applying a load repeatedly applying a state in which the side wall 11c is temporarily deformed by applying at least one of the second urging forces to be applied and a state in which the side wall 11c is not deformed. According to this configuration, it is possible to detect not only a pinhole but also a welding defect of about one thin skin.
（２）気密検査、即ちケース１１の溶接状態の検査は、溶接工程の直後に行われる。ケース１１の溶接状態の検査は、ケース本体１１ａと蓋体１１ｂとの溶接後であればいつでもよいが、他の工程、例えば、電解液の注入工程や安全弁の取付け工程の後に行って、溶接欠陥が検出されると、溶接後に行われた他の工程が無駄になる。しかし、溶接工程の直後であれば、溶接欠陥が検出されても無駄になる作業が少なくなる。 (2) The airtight inspection, that is, the inspection of the welding state of the case 11 is performed immediately after the welding process. The inspection of the welded state of the case 11 may be performed any time after the case main body 11a and the lid 11b are welded, but other processes such as an electrolytic solution injection process and a safety valve mounting process are performed, and welding defects are detected. When is detected, other processes performed after welding are wasted. However, if it is immediately after the welding process, even if a welding defect is detected, less work is wasted.
（３）密閉型蓄電装置のケースの溶接状態検査装置は、ケース本体１１ａと蓋体１１ｂとが溶接された密閉型蓄電装置のケース１１のケースの溶接箇所の気密検査を行う。そして、ケース本体１１ａの側壁１１ｃに、側壁１１ｃをケース外側へ付勢する第１の付勢力及び側壁１１ｃをケース内側へ付勢する第２の付勢力の少なくとも一方を加えて側壁１１ｃを一時的に変形させる状態と、側壁１１ｃの変形が解消された状態を繰り返す負荷を加える圧力付与手段を備えている。この構成によれば、ケース１１の溶接箇所の気密検査を行う際に、圧力付与手段により、ケース本体１１ａの側壁１１ｃに、側壁１１ｃをケース外側へ付勢する第１の付勢力及び側壁１１ｃをケース内側へ付勢する第２の付勢力の少なくとも一方を加えて側壁１１ｃを一時的に変形させる状態と、側壁１１ｃの変形が解消された状態を繰り返す負荷が加えられる。そのため、薄皮１枚程度の溶接欠陥箇所は、気密検査を行う際にはピンホールあるいは亀裂が生じた状態となり、気密検査で検出される。したがって、ピンホールだけでなく薄皮１枚程度の溶接欠陥も検出することができる。 (3) The welded state inspection device for the case of the sealed power storage device performs an airtight test on the welded portion of the case of the sealed power storage device 11 in which the case main body 11a and the lid 11b are welded. Then, at least one of a first urging force for urging the side wall 11c to the outside of the case and a second urging force for urging the side wall 11c to the inside of the case is applied to the side wall 11c of the case body 11a to temporarily move the side wall 11c. Pressure applying means for applying a load that repeats the state of being deformed and the state in which the deformation of the side wall 11c is eliminated. According to this configuration, when performing an airtight inspection of the welded portion of the case 11, the first urging force and the side wall 11c for urging the side wall 11c toward the outside of the case are applied to the side wall 11c of the case main body 11a by the pressure applying unit. A load is applied which repeatedly applies a state in which the side wall 11c is temporarily deformed by applying at least one of the second urging forces for urging the case inside, and a state in which the deformation of the side wall 11c is eliminated. Therefore, a weld defect portion of about one thin skin is in a pinhole or cracked state when performing an airtight inspection, and is detected by the airtight inspection. Therefore, it is possible to detect not only a pinhole but also a welding defect of about one thin skin.
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。
○ ケース１１の側壁１１ｃに付勢力を加える圧力付与手段は、真空パッド１６を往復移動させる構成に限らない。例えば、図４に示すように、圧力付与手段は、ケース１１の側壁１１ｃの外面全体を気密状態で覆う位置に配置可能、かつ、側壁１１ｃの外面全体を気密状態で覆う位置に配置された状態で側壁１１ｃと共に圧力調整室２１を構成する圧力調整部２２を備える。圧力調整部２２は配管２３を介して図示しない圧力源に接続され、圧力調整室２１は、図示しない制御手段により、圧力源から負圧が供給される（減圧される）状態と、大気圧に調整される状態と、加圧気体が供給される状態とに調整されるようになっている。この場合、圧力調整室２１内の圧力を減圧状態にするか、加圧状態にするかのみで、圧力調整部２２を移動させることを行わずに、側壁１１ｃに対する付勢力を、側壁１１ｃが外側に凸となるように撓む状態と、内側に凸となるように撓む状態とに切り換えることができる。
The embodiment is not limited to the above, and may be embodied as follows, for example.
The pressure applying means for applying an urging force to the side wall 11c of the case 11 is not limited to the configuration in which the vacuum pad 16 is reciprocated. For example, as shown in FIG. 4, the pressure applying means can be disposed at a position that covers the entire outer surface of the side wall 11c of the case 11 in an airtight state, and is disposed at a position that covers the entire outer surface of the side wall 11c in an airtight state. The pressure adjustment part 22 which comprises the pressure adjustment chamber 21 with the side wall 11c is provided. The pressure adjusting unit 22 is connected to a pressure source (not shown) via a pipe 23, and the pressure adjusting chamber 21 is in a state where negative pressure is supplied (depressurized) from the pressure source by a control means (not shown), and to atmospheric pressure. It is adjusted to the state to be adjusted and the state to which pressurized gas is supplied. In this case, the pressure in the pressure adjustment chamber 21 is only reduced or increased, and the pressure adjustment unit 22 is not moved, and the urging force on the side wall 11c is applied to the outside of the side wall 11c. Can be switched between a state of bending so as to be convex and a state of bending so as to be convex inward.
○ 圧力付与手段は、側壁１１ｃに対して、側壁１１ｃが外側に凸となるように撓む状態とする付勢力及び側壁１１ｃが内側に凸となるように撓む状態とする付勢力の少なくとも一方を加えることが可能であればよい。即ち、ケース本体１１ａと蓋体１１ｂとの溶接箇所に負荷をかける場合、側壁１１ｃが外側に凸となるように撓む状態となる付勢力と、側壁１１ｃが内側に凸となるように撓む状態となる付勢力との両者を積極的に加える必要はない。例えば、側壁１１ｃが外側に凸となるように撓む状態となる付勢力及び側壁１１ｃが内側に凸となるように撓む状態となる付勢力の一方のみを積極的に加え、その付勢力を解除することにより側壁１１ｃが復元力により元の状態に戻るようにしてもよい。 ○ The pressure applying means is at least one of an urging force for bending the side wall 11c so that the side wall 11c is convex outward and a biasing force for bending the side wall 11c so as to be convex inward. If it is possible to add. That is, when a load is applied to the welded portion between the case body 11a and the lid 11b, the urging force that causes the side wall 11c to bend outward and the side wall 11c to be bent inwardly bend. There is no need to positively add both to the state of force. For example, only one of the urging force that causes the side wall 11c to bend so that it protrudes outward and the urging force that causes the side wall 11c to be bent so as to protrude inward are positively applied, and the urging force is applied. By releasing, the side wall 11c may return to the original state by a restoring force.
○ ケース本体１１ａと蓋体１１ｂとの溶接箇所に負荷を加える作業と、ケース１１の気密検査とを並行して行うようにしてもよい。例えば、側壁１１ｃに付勢力を加える圧力付与手段として圧力調整室２１内の圧力を調整する方法を採用し、ケース１１内にヘリウムガスを充填した状態で圧力調整室２１内の圧力を減圧状態と加圧状態とに交互に変更する。そして、ヘリウムガス検知器により圧力調整室２１内のヘリウムガス濃度を検知する。圧力調整室２１内を減圧状態と加圧状態とに所定回数変更しても、ヘリウムガスが検知されなければ溶接欠陥無しと判断する。また、所定回数に達するまでにヘリウムガスが検知されれば溶接欠陥有りと判断する。この場合、溶接箇所に負荷を加える作業終了後に、気密検査を行う場合に比べて作業に要する時間を短縮することができる。 O You may make it perform the operation | work which applies a load to the welding location of the case main body 11a and the cover body 11b, and the airtight test | inspection of the case 11 in parallel. For example, a method of adjusting the pressure in the pressure adjusting chamber 21 as pressure applying means for applying a biasing force to the side wall 11c is adopted, and the pressure in the pressure adjusting chamber 21 is reduced to a reduced state while the case 11 is filled with helium gas. Change alternately to the pressurized state. Then, the helium gas concentration in the pressure adjusting chamber 21 is detected by the helium gas detector. Even if the inside of the pressure adjusting chamber 21 is changed a predetermined number of times between a reduced pressure state and a pressurized state, if no helium gas is detected, it is determined that there is no welding defect. If helium gas is detected before the predetermined number of times is reached, it is determined that there is a welding defect. In this case, the time required for the work can be shortened as compared with the case where the airtight inspection is performed after the work of applying a load to the welded portion.
○ 気密検査方法は、前述した方法に限らず、例えば、公知の他の方法を採用してもよい。
○ ケース１１は、アルミニウム又はアルミニウム合金製に限らず、例えば、ステンレス製であってもよい。フェライト系ステンレス製の場合、側壁１１ｃを吸着可能な吸着部として真空パッド１６に代えて電磁石を用いてもよい。
O The airtight inspection method is not limited to the method described above, and other known methods may be employed, for example.
The case 11 is not limited to aluminum or aluminum alloy, but may be made of stainless steel, for example. In the case of ferritic stainless steel, an electromagnet may be used in place of the vacuum pad 16 as an adsorption portion that can adsorb the side wall 11c.
○ 電極組立体１２は積層型及び巻回型のいずれであってもよい。
○ 二次電池１０は、リチウムイオン電池に限らず、例えば、ニッケル水素二次電池やニッケルカドミウム二次電池等の他の二次電池であってもよい。
The electrode assembly 12 may be either a laminated type or a wound type.
The secondary battery 10 is not limited to a lithium ion battery, and may be another secondary battery such as a nickel hydride secondary battery or a nickel cadmium secondary battery.
○ 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１に記載の発明において、前記ケース本体と前記蓋体との溶接箇所に負荷をかける作業と、前記気密検査とを並行して行う。 (1) In the invention described in claim 1, the work of applying a load to the welded portion between the case main body and the lid body and the airtight inspection are performed in parallel.
１１…ケース、１１ａ…ケース本体、１１ｂ…蓋体、１１ｃ…側壁、１６…圧力付与手段を構成する真空パッド、２１…圧力付与手段を構成する圧力調整室、２２…圧力付与手段を構成する圧力調整部。 DESCRIPTION OF SYMBOLS 11 ... Case, 11a ... Case main body, 11b ... Cover body, 11c ... Side wall, 16 ... Vacuum pad which comprises pressure provision means, 21 ... Pressure adjustment chamber which comprises pressure provision means, 22 ... Pressure which comprises pressure provision means Adjustment unit.
Claims (2)
前記ケース本体の側壁に、前記側壁をケース外側へ付勢する第１の付勢力及び前記側壁をケース内側へ付勢する第２の付勢力の少なくとも一方を加えて前記側壁を一時的に変形させる状態と、前記側壁の変形が解消された状態を繰り返す負荷を加える圧力付与手段を備えている密閉型蓄電装置のケースの溶接状態検査装置。 A welding state inspection device for a case of a sealed power storage device that performs an airtight inspection of a welded portion of the case of the sealed power storage device in which the case body and the lid are welded,
The side wall of the case body is temporarily deformed by applying at least one of a first urging force for urging the side wall to the outside of the case and a second urging force for urging the side wall to the inside of the case. An apparatus for inspecting a welded state of a sealed power storage device case, comprising pressure applying means for applying a load that repeats the state and the state in which the deformation of the side wall is eliminated.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020129480A (en) * | 2019-02-08 | 2020-08-27 | トヨタ自動車株式会社 | Battery module |
| JP2021001784A (en) * | 2019-06-21 | 2021-01-07 | 豊興工業株式会社 | Airtightness inspection method |
| KR20220037635A (en) | 2020-09-18 | 2022-03-25 | 주식회사 엘지에너지솔루션 | Apparatus and method for evaluating durability of battery module frame for vehicle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020129480A (en) * | 2019-02-08 | 2020-08-27 | トヨタ自動車株式会社 | Battery module |
| JP7100807B2 (en) | 2019-02-08 | 2022-07-14 | トヨタ自動車株式会社 | Battery module |
| JP2021001784A (en) * | 2019-06-21 | 2021-01-07 | 豊興工業株式会社 | Airtightness inspection method |
| JP7317588B2 (en) | 2019-06-21 | 2023-07-31 | 株式会社ジェイテクトフルードパワーシステム | Airtightness test method |
| KR20220037635A (en) | 2020-09-18 | 2022-03-25 | 주식회사 엘지에너지솔루션 | Apparatus and method for evaluating durability of battery module frame for vehicle |
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