JP2002117901A - Sealed battery and its manufacturing method - Google Patents

Sealed battery and its manufacturing method

Info

Publication number
JP2002117901A
JP2002117901A JP2000305866A JP2000305866A JP2002117901A JP 2002117901 A JP2002117901 A JP 2002117901A JP 2000305866 A JP2000305866 A JP 2000305866A JP 2000305866 A JP2000305866 A JP 2000305866A JP 2002117901 A JP2002117901 A JP 2002117901A
Authority
JP
Japan
Prior art keywords
battery
electrolyte
helium
sealed
sealed battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000305866A
Other languages
Japanese (ja)
Inventor
Kazuyuki Tsukawaki
和幸 塚脇
Kiyohide Takimoto
清秀 滝本
Hiroyuki Mizuno
弘行 水野
Yuichi Maekawa
裕一 前川
Original Assignee
Nec Mobile Energy Kk
エヌイーシーモバイルエナジー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Mobile Energy Kk, エヌイーシーモバイルエナジー株式会社 filed Critical Nec Mobile Energy Kk
Priority to JP2000305866A priority Critical patent/JP2002117901A/en
Publication of JP2002117901A publication Critical patent/JP2002117901A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

PROBLEM TO BE SOLVED: To provide a sealed battery positively allowing leakage inspection. SOLUTION: In this sealed battery containing helium, after evacuating the interior of a battery can sealed expect for an electrolyte pouring hole, an electrolyte is poured in from the electrolyte pouring hole by pressurizing it with helium containing gas of a pressure equal to or more than the atmospheric pressure, and after pouring the electrolyte and injecting the helium containing gas, the electrolyte pouring hole is sealed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本発明は、密閉型電池に関
し、電解液の漏液の検査が可能な密閉型電池に関するも
のであり、特に高感度で確実な検査が可能なリチウムイ
オン電池に関するものでる。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery, and more particularly to a sealed battery capable of inspecting for leakage of an electrolyte, and more particularly to a lithium ion battery capable of performing highly sensitive and reliable inspection. .
【0002】[0002]
【従来の技術】リチウムイオン電池等の密閉型電池にお
いては、電池缶へ電池要素を収納した後に、外部接続端
子、安全弁、電解液注液口等を設けたヘッダーを溶接
し、電解液注液口を除いて密閉し電解液注液口から電解
液を注液した後に、電解液注液口に封口片を装着し、レ
ーザー溶接によって封口することによって密閉型電池を
作製している。
2. Description of the Related Art In a sealed battery such as a lithium ion battery, after a battery element is housed in a battery can, a header provided with an external connection terminal, a safety valve, an electrolyte injection port, and the like are welded, and the electrolyte is injected. A sealed battery is manufactured by sealing the battery except for the opening and injecting the electrolyte from the electrolyte injection port, attaching a sealing piece to the electrolyte injection port, and sealing by laser welding.
【0003】密閉型電池の製造の際に封口時における溶
接の不良、あるいは絶縁性部材を介して取り付けた外部
接続端子部のかしめ不良等によって、電解液が漏洩した
り、あるいは外気中の水分が電池内部に浸入することが
ある。封口不良の密閉型電池では、電池性能の劣化とと
もに、電解液の漏液による機器の損傷等の問題が生じる
可能性があった。このため、封口不良の電池が出荷され
ないように、漏洩を検査することが行われているが、封
口の後に充電をした電池を視覚によって検査を行い、電
解液の漏液によって表面の汚れ等を確認する外観検査が
一般的であった。しかしながら、人間の視覚による検査
方法では、検査員の個人差によるばらつきが生じる可能
性があるとともに、微細な封口不良個所等がある場合に
は、漏洩量は極微細であるために出荷時の期間が制限さ
れた検査ではそのような微細な封口不良の電池の発見は
困難であり、問題とされる可能性があった。
[0003] In the manufacture of a sealed battery, due to poor welding at the time of sealing or poor caulking of an external connection terminal portion attached via an insulating member, electrolyte leaks or moisture in the outside air is reduced. May get inside the battery. In a sealed battery with poor sealing, there is a possibility that problems such as damage to equipment due to leakage of electrolyte and the like may occur along with deterioration of battery performance. For this reason, leaks are inspected to prevent batteries with poor sealing from being shipped.However, after charging, batteries that have been charged are visually inspected to check for dirt on the surface due to electrolyte leakage. A visual inspection to confirm was common. However, the inspection method based on human vision may cause variations due to individual differences among inspectors, and when there is a minute defective sealing, etc., the amount of leakage is extremely small, so the period of shipping However, it is difficult to find such a finely sealed battery with a poor sealing in the inspection where the inspection is limited, and there is a possibility that the battery may be problematic.
【0004】そこで、人間の視覚等に頼らない気密試験
装置を用いた気密試験方法も提案されている。例えば、
特開平9−115555号公報には、被試験電池を密閉
容器内に収容して内部の気体を減圧した後に、密閉容器
内の圧力変化を測定する方法が提案されているが、圧力
変化では短時間に、しかも正確に漏洩電池を検出するも
のではなかった。また、特開平4−25738号公報に
は、電池の組立工程において、電池槽に蓋体を取り付け
た後に、電池槽内に水素を加圧して供給し、漏洩する水
素を半導体ガスセンサーで検知する気密検査装置が記載
されているが、電解液を注入した密閉型電池の完成品の
漏洩検査を行うものではなく、また水素という爆発性の
気体を使用するものであり安全上も問題があった。ま
た、特開平11−307136号公報には、電槽に蓋体
を接合した後に電槽と蓋体の接合部を覆うカバーを装着
し、電槽内部へヘリウムを供給し、カバー内部の空気を
吸引し、吸引空気中のヘリウムを検出することにより気
密性を判定する気密試験装置が記載されているが、製造
工程での電槽と蓋体との接合を検査するものであり、電
解液を注入して密閉電池の完成品の漏洩検査を行うもの
ではなかった。
Therefore, an airtightness test method using an airtightness test apparatus that does not rely on human vision or the like has been proposed. For example,
Japanese Patent Application Laid-Open No. Hei 9-115555 proposes a method in which a battery under test is housed in a closed container and the pressure inside the closed container is measured after the internal gas is decompressed. The leaked battery was not detected in time and accurately. Japanese Patent Application Laid-Open No. 4-25738 discloses that in a battery assembling process, after a lid is attached to a battery tank, hydrogen is supplied under pressure into the battery tank, and leaking hydrogen is detected by a semiconductor gas sensor. Although an airtightness inspection device is described, it does not perform a leak inspection of a completed sealed battery in which an electrolyte is injected, and uses an explosive gas called hydrogen, which has a safety problem. . In Japanese Patent Application Laid-Open No. 11-307136, a cover for covering a joint between the battery case and the cover is attached after the cover is joined to the battery case, helium is supplied into the battery case, and air inside the cover is released. An airtightness test device that determines the airtightness by suctioning and detecting helium in the suctioned air is described.However, it is intended to inspect the joining between a battery case and a lid in a manufacturing process, and to measure an electrolytic solution. It was not intended to perform a leak inspection of the completed sealed battery after injection.
【0005】[0005]
【発明が解決しようとする課題】本発明は、密閉型電池
の微細な封口不良個所を確実に発見することが可能な、
密閉型電池を提供することを課題とするものであり、封
口不良の電池の出荷を確実に排除する密閉型電池の製造
方法を提供することを課題とするものである。
SUMMARY OF THE INVENTION According to the present invention, it is possible to reliably find a small defective sealing portion of a sealed battery.
An object of the present invention is to provide a sealed battery, and an object of the present invention is to provide a method of manufacturing a sealed battery that reliably eliminates shipment of a battery having a poor sealing.
【0006】[0006]
【課題を解決するための手段】本発明の課題は、密閉型
電池において、内部にヘリウムを含有する密閉型電池に
よって解決することができる。また、密閉型電池の製造
方法において、電解液注液口を除いて密閉した電池缶内
を排気した後に、電解液注液口から大気圧以上の圧力の
ヘリウム含有気体によって加圧し、電解液の注液とヘリ
ウム含有気体の注入を行った後に電解液注液口を封口す
る密閉型電池の製造方法である。ヘリウム含有気体を供
給する際には、電池缶壁面を押圧し電池缶の変形を防止
する押圧手段を設けた前記の密閉型電池の製造方法であ
る。密閉型電池の漏洩検出方法において、ヘリウムを含
有した密閉型電池をヘリウム漏洩検出装置によって測定
することにより漏洩検出する密閉型電池の漏洩検出方法
である。また、リチウムイオン電池である前記の密閉型
電池である。
The object of the present invention can be solved by a sealed battery containing helium therein. Further, in the method for manufacturing a sealed battery, after the inside of the sealed battery can is evacuated except for the electrolyte injection port, pressure is applied from the electrolyte injection port with a helium-containing gas at a pressure higher than the atmospheric pressure, and the electrolyte is discharged. This is a method for manufacturing a sealed battery in which an electrolyte injection port is sealed after an injection and a helium-containing gas are injected. This is a method for producing a sealed battery as described above, wherein the helium-containing gas is supplied with a pressing means for pressing a wall surface of the battery can to prevent deformation of the battery can. In the method for detecting leakage of a sealed battery, a method of detecting leakage of a sealed battery in which a helium-containing sealed battery is measured by a helium leak detection device to detect leakage. Further, the above sealed battery is a lithium ion battery.
【0007】[0007]
【発明の実施の形態】本発明は、密閉型電池の組立工程
において、密閉型電池内にヘリウムを充填した後に封口
をすることにより、ヘリウムを含有した密閉型電池を製
造したものであり、密閉型電池から漏洩するヘリウムの
濃度をヘリウム漏洩検出装置で検出することによって、
封口不良の密閉型電池を確実に発見することが可能であ
ることを見出したものである。図1は、本発明の密閉型
電池を製造する工程を説明する図であり、電解液とヘリ
ウムを電池缶内に注入する装置を説明する図である。電
池缶1内に電池要素2を収納し、電池缶1の上部の開口
部に、電解液注液口3、外部電極取り出し端子4および
電池内部の圧力上昇時に電池の破裂等を防止する圧力開
放弁等を有した蓋体5をレーザー溶接等の方法によって
取り付けた電池缶1に、電解液注液装置6の注液ノズル
7を蓋体5に設けた電解液注液口3に電解液注液装置6
の注液ノズル7を装着されるものである。注液ノズル7
には、O−リング8等の気密保持手段を有し、蓋体の壁
面に押し当てた際に気密が保持される。また、電解液注
液装置6には、電池缶内の排気用の排気手段9、および
注液ノズル7と排気手段9を結合する排気弁10を有し
ている。注液ノズル7には、所定量の電解液を貯留する
電解液ポット11が電解液注液弁12を介して結合され
ており、電解液ポット11には、電解液13の貯蔵手段
14と結合した電解液供給手段15が電解液供給弁16
を介して結合されている。また、電解液ポット11に
は、ヘリウム供給手段17が加圧弁18を介して結合さ
れている。
BEST MODE FOR CARRYING OUT THE INVENTION The present invention is to manufacture a sealed battery containing helium by filling the sealed battery with helium and then closing the sealed battery in the process of assembling the sealed battery. By detecting the concentration of helium leaking from the type battery with a helium leak detection device,
It has been found that it is possible to reliably detect a sealed battery having a poor sealing. FIG. 1 is a diagram illustrating a process of manufacturing a sealed battery according to the present invention, and is a diagram illustrating an apparatus for injecting an electrolyte and helium into a battery can. The battery element 2 is housed in the battery can 1, and the opening at the top of the battery can 1 is provided with an electrolyte injection port 3, an external electrode take-out terminal 4, and a pressure release for preventing the battery from bursting when the pressure inside the battery rises. An injection nozzle 7 of an electrolyte injection device 6 is provided on the battery can 1 to which a lid 5 having a valve or the like is attached by a method such as laser welding. Liquid device 6
Is mounted. Injection nozzle 7
Has an air-tightness maintaining means such as an O-ring 8 and the like, and when pressed against the wall surface of the lid, airtightness is maintained. Further, the electrolyte injection device 6 includes an exhaust unit 9 for exhausting the inside of the battery can, and an exhaust valve 10 connecting the injection nozzle 7 and the exhaust unit 9. An electrolyte pot 11 for storing a predetermined amount of electrolyte is connected to the injection nozzle 7 via an electrolyte injection valve 12. The electrolyte pot 11 is connected to storage means 14 for the electrolyte 13. The supplied electrolyte supply means 15 is connected to the electrolyte supply valve 16.
Are coupled through. Helium supply means 17 is connected to the electrolyte pot 11 via a pressure valve 18.
【0008】図2は、本発明の電解液とヘリウムの注入
装置の動作を順を追って説明する図である。図2(A)
に示すように、電池缶1内に電池要素を収納し、電池缶
1の上部の開口部に、電解液注液口3を有した蓋体5を
レーザー溶接等の方法によって取り付けた電池缶1を、
電解液注液装置6の注液ノズル7を蓋体5に設けた電解
液注液口3に気密に装着する。次いで、排気手段9を作
動させて注液ノズル7と排気手段9を結合する排気弁1
0を開放し、電池缶内を排気するとともに、電解液供給
手段15から電解液供給弁16を介して、電池に応じた
所定量の電解液を電解液ポット11に注液する。
FIG. 2 is a view for sequentially explaining the operation of the electrolytic solution and helium injecting apparatus of the present invention. FIG. 2 (A)
As shown in FIG. 1, a battery element is housed in a battery can 1 and a lid 5 having an electrolyte injection port 3 is attached to an upper opening of the battery can 1 by a method such as laser welding. To
The injection nozzle 7 of the electrolyte injection device 6 is hermetically attached to the electrolyte injection port 3 provided on the lid 5. Then, the exhaust valve 9 is operated to connect the liquid injection nozzle 7 and the exhaust unit 9.
0 is opened, the inside of the battery can is evacuated, and a predetermined amount of the electrolytic solution corresponding to the battery is poured into the electrolytic solution pot 11 from the electrolytic solution supply means 15 through the electrolytic solution supply valve 16.
【0009】次いで、図2(B)に示すように、排気弁
10および電解液供給弁16を閉じて、電解液注液弁1
2を開放する。電解液は、電池缶内が減圧されているの
で、電池缶内と電解液ポット11の圧力差によって電解
液の電池缶内への注液が始まる。電解液ポット11内の
電解液の注液が開始されると、図2(C)に示すよう
に、ヘリウム供給手段17に結合した加圧弁を開放さ
れ、電解液ポット11内の電解液がヘリウムによって加
圧されるので、電解液は電池缶内へ速やかに注液される
と共に、ヘリウムも電解液に溶存して注液されるととも
に、電解液注液口から気体として電解液内部に注入さ
れ、電池内部はヘリウム雰囲気によって満たされる。ま
た、電解液およびヘリウムの注入の際に、電池缶が内部
から加圧されるので、電池缶の大きさ種類等によって
は、電池缶の壁面が膨張して変形する等の現象が生じる
ので、電池缶の加圧時には電池缶の膨張による変形を抑
制することが好ましい。
Next, as shown in FIG. 2B, the exhaust valve 10 and the electrolyte supply valve 16 are closed, and the electrolyte injection valve 1 is closed.
Release 2. Since the inside of the battery can is depressurized, the pressure difference between the inside of the battery can and the electrolyte pot 11 starts the injection of the electrolyte into the battery can. When the injection of the electrolyte in the electrolyte pot 11 is started, as shown in FIG. 2C, the pressure valve connected to the helium supply means 17 is opened, and the electrolyte in the electrolyte pot 11 is changed to helium. The electrolyte is quickly injected into the battery can, helium is also dissolved and injected into the electrolyte, and is injected into the electrolyte as a gas from the electrolyte injection port. The inside of the battery is filled with a helium atmosphere. Also, when the electrolyte and helium are injected, the battery can is pressurized from the inside, and depending on the size and type of the battery can, a phenomenon such as the wall surface of the battery can expands and deforms occurs. When the battery can is pressurized, it is preferable to suppress deformation due to expansion of the battery can.
【0010】図3は、電池缶の変形を防止する手段を説
明する図である。電解液注液ノズル7から電解液の注液
が始まった後に、加圧弁18を開放して電解液ポット1
1内の電解液をヘリウムによって加圧するとともに、押
圧手段20によって電池缶の壁面21を両側から押圧し
て電池缶1の壁面21の変形を防止するものである。電
池缶の壁面を押圧する圧力は、電池缶内に注液する電解
液の圧力に応じた圧力であり、加圧力と等しい圧力で押
圧することが好ましい。本発明の電解液およびヘリウム
注入装置は、電池活物質の種類、電池の形状、構造等に
よって任意に設定することができるが、電池缶内部の排
気は、1.07kPaないし1.33kPaに、5秒間
ないし7秒間で排気した状態で、2秒間程度その減圧度
を保持し、真空度が安定し、漏れ等がないことを確認し
た後に、排気弁を閉じて電解液の注液を開始し、電解液
の注液開始後4〜10秒後に、加圧弁を開放してヘリウ
ムで加圧する。ヘリウムの加圧力は、ゲージ圧で0.0
8MPaないし0.20MPaとすることが好ましい。
例えば、本発明の電解液の注液装置によれば、縦48m
m、横30mm、厚さ6mmの電池に設けた直径1mm
の電解液注液口から粘稠な非水系電解液であっても60
秒間で注液することができる。
FIG. 3 is a view for explaining means for preventing deformation of the battery can. After the injection of the electrolyte from the electrolyte injection nozzle 7 is started, the pressure valve 18 is opened and the electrolyte pot 1 is opened.
The electrolyte solution in the battery can 1 is pressurized with helium, and the pressing means 20 presses the wall surface 21 of the battery can from both sides to prevent deformation of the wall surface 21 of the battery can 1. The pressure for pressing the wall surface of the battery can is a pressure corresponding to the pressure of the electrolytic solution injected into the battery can, and is preferably pressed at a pressure equal to the pressing force. The electrolyte and helium injection device of the present invention can be arbitrarily set depending on the type of the battery active material, the shape and the structure of the battery, etc., but the exhaust inside the battery can is reduced to 1.07 kPa to 1.33 kPa. After exhausting for 2 to 7 seconds, maintain the reduced pressure for about 2 seconds, after confirming that the degree of vacuum is stable and there is no leakage, etc., close the exhaust valve and start injecting the electrolyte, Four to ten seconds after the start of the electrolyte injection, the pressure valve is opened and pressurized with helium. Helium pressure is 0.0
It is preferably 8 MPa to 0.20 MPa.
For example, according to the electrolytic solution injection device of the present invention,
m, 30 mm in width, 1 mm in diameter provided on a battery with a thickness of 6 mm
Even if the viscous non-aqueous electrolyte is
It can be injected in seconds.
【0011】また、ヘリウムには、他の希ガス類を混合
しても良く、あるいは窒素、二酸化炭素等を混合したも
のであっても良いが、希ガス以外の含有量が増加すると
漏洩検出能力が低下するので、ヘリウム等の希ガスの含
有量が大きい方が好ましく、また希ガスのなかでも分子
の小さなヘリウムが微細な漏洩個所を通過しやすいので
好ましい。また、以上の説明においては、ヘリウムを電
解液の注液の際の加圧用気体としても用いることで電解
液の注液と同時に電池缶内にヘリウムを導入する方法に
ついて説明をしたが、電解液の注液とヘリウムの注入を
別に行っても良い。この場合には、電解液の注液を終了
した電池缶に個別に注液口からヘリウムを注入する方
法、電解液の注液を終了した電池缶を密閉室内に設けて
密閉室内を排気し減圧した後に、密閉室内をヘリウムで
満たして注入する方法等によって注入することができ
る。
Further, helium may be mixed with other rare gases, or may be a mixture of nitrogen, carbon dioxide and the like. For this reason, it is preferable that the content of a rare gas such as helium is large, and among rare gases, helium having a small molecule is preferable because it easily passes through a fine leak site. In the above description, the method of introducing helium into the battery can simultaneously with the injection of the electrolyte by using helium as a pressurizing gas when the electrolyte is injected has been described. Injection of helium and injection of helium may be performed separately. In this case, a method of individually injecting helium from the injection port into the battery can after the injection of the electrolyte is provided, the battery can after the injection of the electrolyte is provided in a closed chamber, the closed chamber is evacuated, and the pressure is reduced. After that, injection can be performed by filling the closed chamber with helium and performing injection.
【0012】次に、本発明のヘリウムを含有した密閉型
電池の漏洩検査方法について説明する。図4は、漏洩検
査方法の一例を説明する図である。図4(A)に示すよ
うに、レーザー溶接手段30によって、電池缶1の蓋体
に設けた電解液注液口3を封口することによって密閉型
電池31を作製し、初期充電を行った後に、図4(B)
に示すように、密閉型電池31を漏洩検出チャンバー3
2内に設置し、ヘリウム漏洩検出器33によって、漏洩
検出チャンバー32内の気体を吸引してヘリウム濃度を
測定することによって、電池の漏洩の有無を検出するこ
とができる。また、図4(C)に示すように、漏洩検出
チャンバー32に減圧装置34を接続し、漏洩検出チャ
ンバー内を減圧することによって、検出対象の電池内外
の気圧差を大きくし、それによって微細な漏洩個所から
の漏洩速度を高めて漏洩検査を促進しても良い。
Next, a method for inspecting leakage of a sealed battery containing helium according to the present invention will be described. FIG. 4 is a diagram illustrating an example of the leak inspection method. As shown in FIG. 4A, a sealed battery 31 is manufactured by closing the electrolyte injection port 3 provided on the lid of the battery can 1 by laser welding means 30, and after initial charging is performed. , FIG. 4 (B)
As shown in FIG.
2, the helium leak detector 33 sucks the gas in the leak detection chamber 32 and measures the helium concentration to detect the presence or absence of battery leakage. Further, as shown in FIG. 4C, a pressure reducing device 34 is connected to the leak detection chamber 32 to reduce the pressure inside the leak detection chamber, thereby increasing the pressure difference between the inside and outside of the battery to be detected, thereby minimizing the difference. The leak rate from the leak location may be increased to facilitate leak inspection.
【0013】図5は、漏洩検査方法の他の例を説明する
図である。漏洩検出チャンバー32内に、電池トレイ3
5に多数の密閉型電池31を収納して設け、漏洩検出チ
ャンバー32内に設置し、ヘリウム漏洩検出器33によ
って、漏洩検出チャンバー32内の気体を吸引してヘリ
ウム濃度を測定し、ヘリウムが検出された場合には、検
出された電池トレイの密閉型電池のそれぞれを、先に図
4に示したものと同様に、漏洩検出チャンバー32内に
設置し、ヘリウム漏洩検出器33によって、漏洩検出チ
ャンバー32内の気体を吸引してヘリウム濃度を測定し
て漏洩電池を特定することができる。図6は、漏洩検査
方法の他の例を説明する図である。密閉型電池31の周
囲の溶接個所等の漏洩の生じる可能性のある個所に、ヘ
リウム漏洩検出器33のスニファプローブ36を近づけ
て、漏洩の有無を確認する方法であり、このような方法
によって確認することができる。
FIG. 5 is a diagram for explaining another example of the leak inspection method. In the leak detection chamber 32, the battery tray 3
5, a large number of sealed batteries 31 are accommodated and provided, installed in the leak detection chamber 32, and the helium leak detector 33 sucks the gas in the leak detection chamber 32 and measures the helium concentration to detect helium. In this case, each of the detected sealed batteries in the battery tray is set in the leak detection chamber 32 in the same manner as that shown in FIG. The leaked battery can be specified by measuring the helium concentration by sucking the gas in 32. FIG. 6 is a diagram illustrating another example of the leak inspection method. This is a method of checking the presence or absence of leakage by bringing the sniffer probe 36 of the helium leak detector 33 close to a location where leakage may occur, such as a welding location around the sealed battery 31, and checking by such a method. can do.
【0014】図7は、漏洩検出方法の他の例を説明する
図であり、斜視図である。漏洩検出をすべき密閉型電池
31は、検出トレイ37に設けた複数の検出槽38内に
収容されている。検出槽には、漏洩検出プローブ39を
取り付けた検出ヘッド40を個別に気密に装着し、各検
出槽内のヘリウム濃度を測定することによって漏洩の有
無を検出することができる。また、検出ヘッドを装着の
後に、検出槽内を減圧して測定を行っても良い。検出ヘ
ッドをX、Y、Zの3軸方向の任意の位置へ移動可能な
搬送手段に取り付けるとともに、漏洩が検出された電池
を取り除く手段を設けることにより、漏洩の検出工程の
自動的も可能となる。
FIG. 7 is a perspective view for explaining another example of the leak detection method. The sealed battery 31 to be detected for leakage is accommodated in a plurality of detection tanks 38 provided on the detection tray 37. Detection heads 40 each having a leak detection probe 39 attached thereto are individually and hermetically attached to the detection tanks, and the presence or absence of leakage can be detected by measuring the helium concentration in each detection tank. After the detection head is mounted, the measurement may be performed by reducing the pressure in the detection tank. By attaching the detection head to a transporting means that can be moved to any position in the X, Y, and Z directions and providing a means for removing the battery in which the leak has been detected, the leak detecting process can be automatically performed. Become.
【0015】また、本発明のヘリウムを含有した密閉型
電池は、リチウムイオン電池等の非水系電解液電池、ポ
リマー電解質を用いた電池、ニッケル水素電池、密閉型
鉛電池等の水系電解液電池にも適用することができる。
Further, the sealed battery containing helium of the present invention can be used as a non-aqueous electrolyte battery such as a lithium ion battery, a battery using a polymer electrolyte, a nickel hydride battery, a sealed lead battery and other aqueous electrolyte batteries. Can also be applied.
【0016】[0016]
【発明の効果】本発明のヘリウムを含有した密閉型電池
によって、密閉型電池の封口個所、あるいは導電接続端
子の取り出し個所等の漏洩の可能性のある個所を、測定
装置によってばらつきなく確実に測定することが可能と
なり、漏洩不良の電池が誤って出荷される可能性をなく
すことができ、出荷される電池の信頼性を高めることが
可能となる。
According to the sealed battery containing helium of the present invention, a leak-proof place such as a sealing place of a sealed battery or a place where a conductive connection terminal is taken out can be reliably measured by a measuring device without variation. It is possible to eliminate the possibility that a battery with a leakage failure is accidentally shipped, and to increase the reliability of the shipped battery.
【図面の簡単な説明】[Brief description of the drawings]
【図1】図1は、本発明の密閉型電池を製造する工程を
説明する図であり、電解液とヘリウムを電池缶内に注入
する装置を説明する図である。
FIG. 1 is a diagram illustrating a process for manufacturing a sealed battery according to the present invention, and is a diagram illustrating an apparatus for injecting an electrolyte and helium into a battery can.
【図2】図2は、本発明の電解液とヘリウムの注入装置
の動作を順を追って説明する図である。
FIG. 2 is a diagram for sequentially explaining the operation of the electrolytic solution and helium injecting device of the present invention.
【図3】図3は、電池缶の変形を防止する手段を説明す
る図である。
FIG. 3 is a diagram illustrating a means for preventing deformation of a battery can.
【図4】図4は、漏洩検査方法の一例を説明する図であ
る。
FIG. 4 is a diagram illustrating an example of a leakage inspection method.
【図5】図5は、漏洩検査方法の他の例を説明する図で
ある。
FIG. 5 is a diagram illustrating another example of the leak inspection method.
【図6】図6は、漏洩検査方法の他の例を説明する図で
ある。
FIG. 6 is a diagram illustrating another example of the leak inspection method.
【図7】図7は、漏洩検査方法の他の例を説明する図で
ある。
FIG. 7 is a diagram illustrating another example of the leak inspection method.
【符号の説明】[Explanation of symbols]
1…電池缶、2…電池要素、3…電解液注液口、4…外
部電極取り出し端子、5…蓋体、6…電解液注液装置、
7…注液ノズル、8…O−リング、9…排気手段、10
…排気弁、11…電解液ポット、12…電解液注液弁、
13…電解液、14…貯蔵手段、15…電解液供給手
段、16…電解液供給弁、17…ヘリウム供給手段、1
8…加圧弁、20…押圧手段、21…電池缶の壁面、3
0…レーザー溶接手段、31…密閉型電池、32…漏洩
検出チャンバー、33…ヘリウム漏洩検出器、34…減
圧装置、35…電池トレイ、36…スニファプローブ、
37…検出トレイ、38…検出槽、39…漏洩検出プロ
ーブ、40…検出ヘッド
DESCRIPTION OF SYMBOLS 1 ... Battery can, 2 ... Battery element, 3 ... Electrolyte injection port, 4 ... External electrode extraction terminal, 5 ... Lid, 6 ... Electrolyte injection device,
7 ... injection nozzle, 8 ... O-ring, 9 ... exhaust means, 10
... exhaust valve, 11 ... electrolyte pot, 12 ... electrolyte injection valve,
13: electrolyte, 14: storage means, 15: electrolyte supply means, 16: electrolyte supply valve, 17: helium supply means, 1
8 ... pressurizing valve, 20 ... pressing means, 21 ... wall surface of battery can, 3
0: laser welding means, 31: sealed battery, 32: leak detection chamber, 33: helium leak detector, 34: pressure reducing device, 35: battery tray, 36: sniffer probe,
37: detection tray, 38: detection tank, 39: leak detection probe, 40: detection head
───────────────────────────────────────────────────── フロントページの続き (72)発明者 水野 弘行 栃木県宇都宮市針ヶ谷町484番地 エヌイ ーシーモバイルエナジー株式会社内 (72)発明者 前川 裕一 栃木県宇都宮市針ヶ谷町484番地 エヌイ ーシーモバイルエナジー株式会社内 Fターム(参考) 5H028 AA01 BB01 BB02 BB03 BB04 BB05 BB11 BB15 BB17 EE01 HH09 5H029 AJ14 BJ02 CJ03 CJ05 CJ13 CJ28 CJ30 DJ01 DJ02 DJ11 EJ09 HJ15 5H030 AA10 AS20 FF31  ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Mizuno 484 Harigaya-cho, Utsunomiya-shi, Tochigi NAC Mobile Energy Corporation (72) Inventor Yuichi Maekawa 484 Harigaya-cho, Utsunomiya-shi, Tochigi NMC Mobile Energy F term in the company (reference)

Claims (4)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 密閉型電池において、内部にヘリウムを
    含有することを特徴とする密閉型電池。
    1. A sealed battery comprising helium therein.
  2. 【請求項2】 密閉型電池の製造方法において、電解液
    注液口を除いて密閉した電池缶内を排気した後に、電解
    液注液口から大気圧以上の圧力のヘリウム含有気体によ
    って加圧し、電解液の注液とヘリウム含有気体の注入を
    行った後に電解液注液口を封口することを特徴とする密
    閉型電池の製造方法。
    2. A method for manufacturing a sealed battery, wherein the inside of a sealed battery can is evacuated except for an electrolyte injection port, and then pressurized with a helium-containing gas at a pressure higher than atmospheric pressure from the electrolyte injection port, A method for manufacturing a sealed battery, comprising: closing an electrolyte injection port after injecting an electrolyte and injecting a helium-containing gas.
  3. 【請求項3】 ヘリウム含有気体を供給する際には、電
    池缶壁面を押圧し電池缶の変形を防止する押圧手段を設
    けたことを特徴とする請求項2記載の密閉型電池の製造
    方法。
    3. The method for manufacturing a sealed battery according to claim 2, further comprising a pressing means for pressing a wall surface of the battery can to prevent deformation of the battery can when supplying the helium-containing gas.
  4. 【請求項4】 密閉型電池の漏洩検出方法において、ヘ
    リウムを含有した密閉型電池をヘリウム漏洩検出装置に
    よって測定することにより漏洩検出することを特徴とす
    る密閉型電池の漏洩検出方法。
    4. A method for detecting leakage of a sealed battery, wherein the leakage is detected by measuring a sealed battery containing helium with a helium leak detection device.
JP2000305866A 2000-10-05 2000-10-05 Sealed battery and its manufacturing method Pending JP2002117901A (en)

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