JP2000306565A - Safety mechanism of sealed type battery - Google Patents
Safety mechanism of sealed type batteryInfo
- Publication number
- JP2000306565A JP2000306565A JP11208376A JP20837699A JP2000306565A JP 2000306565 A JP2000306565 A JP 2000306565A JP 11208376 A JP11208376 A JP 11208376A JP 20837699 A JP20837699 A JP 20837699A JP 2000306565 A JP2000306565 A JP 2000306565A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- plate
- pressure receiving
- receiving plate
- 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
Links
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
- Gas Exhaust Devices For Batteries (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は密閉型電池の内圧
が、何等かの異常により、保安上の規定値を越えて上昇
した場合に、電池容器が過大に変形したり、爆発したり
する事を防止する保安機構に関する。BACKGROUND OF THE INVENTION The present invention relates to a battery container that is excessively deformed or explodes when the internal pressure of a sealed battery rises above a specified value for security due to some abnormality. And a security mechanism for preventing
【０００２】[0002]
【従来の技術】近年、携帯型機器の、高機能化や小型軽
量化にともない、リチウムイオン二次電池等の小型軽量
を特長とする密閉型の高性能二次電池が普及している。
これらの高性能二次電池は過充電や短絡によって、電池
容器の内圧が上昇し、電池容器が過大に変形して周辺の
機器を破損したり、爆発によって人体に危害を与える危
険性がある。この様な危険を回避する目的で、電池内部
の温度上昇に反応して電池の内部回路を遮断する感温抵
抗素子（ＰＴＣ）を使用したり、電池容器の異常な内圧
で、機械的に電池の内部回路を遮断する回路遮断機構、
さらに電池容器の異常な内圧で、電池容器の一部に通気
穴を形成し、異常な内圧を開放する開裂式安全弁等の保
安機構が考案され実用化されており、密閉型電池内部に
発生する異常な圧力により、電池内に収納される発電要
素から外部端子に至る内部回路を遮断する回路遮断機能
と、電池容器の一部に通気穴を形成して異常な内圧を開
放する開裂式の防爆機能を合わせ持つ、特願平１１−３
５９４９号が開示されている。2. Description of the Related Art In recent years, with the advancement of functions and miniaturization of portable devices, sealed high-performance secondary batteries, such as lithium ion secondary batteries, which are characterized by small size and light weight, have become widespread.
In these high-performance secondary batteries, the internal pressure of the battery container increases due to overcharging or short-circuit, and the battery container may be excessively deformed, causing damage to peripheral devices, or causing harm to the human body due to explosion. In order to avoid such danger, use a temperature-sensitive resistance element (PTC) that shuts off the internal circuit of the battery in response to a rise in the temperature inside the battery, or mechanically operates the battery by abnormal internal pressure of the battery container. Circuit cut-off mechanism to cut off the internal circuit of the
In addition, a safety mechanism such as a rupture-type safety valve that forms a vent hole in a part of the battery container at the abnormal internal pressure of the battery container and releases the abnormal internal pressure has been devised and put into practical use, and is generated inside the sealed battery. A circuit shutoff function that shuts off the internal circuit from the power generation element housed in the battery to the external terminal due to abnormal pressure, and a tear-off explosion-proof that opens a vent hole in a part of the battery container to release abnormal internal pressure Japanese Patent Application No. 11-3 with functions
No. 5949 is disclosed.
【０００３】[0003]
【発明が解決しようとする課題】密閉型電池の保安機構
として、密閉型電池内部に発生する異常な圧力により、
電池内に収納される発電要素から外部端子に至る内部回
路を遮断する回路遮断機能と、電池容器の一部に通気穴
を形成して異常な内圧を開放する開裂式の防爆機能を合
わせ持つ、特願平１１−３５９４９号が開示されている
が、この方法ではパッキンの一部に、内側に張り出した
絶縁リブ部を設けてこの絶縁リブ部を夾んで受圧板と接
続板を接合しているために、電池の組立工程において、
パッキンの内側に端子板、ＰＴＣ、受圧板、接続板等を
組み込んだ封口体ユニットを電池缶の開口部に挿入し
て、かしめる際に、パッキンの変形に伴って受圧板と接
続板の接合強度が劣化し、作動精度が低下したり、接合
部が破断してしまう問題が存在し、これらの解決が求め
られていた。SUMMARY OF THE INVENTION As a security mechanism for a sealed battery, an abnormal pressure generated inside the sealed battery causes
It has both a circuit shut-off function that shuts off the internal circuit from the power generation element housed in the battery to the external terminal, and a tear-off explosion-proof function that opens a vent hole in part of the battery container to release abnormal internal pressure. Japanese Patent Application No. 11-35949 is disclosed, but in this method, an insulating rib portion protruding inward is provided in a part of the packing, and the pressure receiving plate and the connection plate are joined together by sandwiching the insulating rib portion. In the battery assembly process,
When the sealing unit with the terminal plate, PTC, pressure receiving plate, connection plate, etc. incorporated inside the packing is inserted into the opening of the battery can and crimped, the pressure receiving plate and the connection plate are joined together with the deformation of the packing. There are problems that the strength is deteriorated, the operation accuracy is reduced, and the joint is broken, and these solutions have been demanded.
【０００４】[0004]
【課題を解決するための手段】本発明では、特願平１１
−３５９４９号におけるパッキンから絶縁リブを削除
し、新たに、受圧板３と接続板４の接合部９以外を絶縁
に保ちつつ、電池容器の内圧が規定値を越えて上昇した
場合には、受圧板３の受圧部３ｂがこの内圧を受けて電
池容器の外側に向かって変形する応力を、接合部９に作
用させ、受圧板３に通気穴３ａを形成しつつ受圧板３と
接続板４を離反させ遮断する機能を有する絶縁スペーサ
１０を考案し、受圧板３と接続板４の間に組み込むこと
により、特願平１１−３５９４９号に開示される発明の
問題点として提起されていた、封口体ユニットを電池缶
の開口部に挿入して、かしめる際に、パッキンの変形に
伴って受圧板と接続板の接合強度が劣化して作動精度が
低下したり、接合部が破断する等の問題を解決したので
ある。According to the present invention, Japanese Patent Application No. Hei 11
In the case where the internal pressure of the battery container rises above a specified value while removing the insulating ribs from the packing in JP-A-359949 and maintaining the insulation except for the joint 9 between the pressure receiving plate 3 and the connecting plate 4, the pressure receiving pressure is increased. The pressure receiving portion 3b of the plate 3 receives the internal pressure and applies a stress that deforms toward the outside of the battery container to the joining portion 9 so that the pressure receiving plate 3 and the connection plate 4 are formed while forming the ventilation hole 3a in the pressure receiving plate 3. By devising an insulating spacer 10 having a function of separating and blocking, and incorporating the insulating spacer between the pressure receiving plate 3 and the connecting plate 4, the sealing disclosed as a problem of the invention disclosed in Japanese Patent Application No. 11-35949 is proposed. When the body unit is inserted into the opening of the battery can and swaged, the joint strength between the pressure receiving plate and the connection plate is deteriorated due to the deformation of the packing and the operation accuracy is reduced, and the joint is broken. The problem was solved.
【０００５】[0005]
【発明の実施の形態】本実施例では、本発明による新し
い感圧式遮断防爆機構を、電池の外径が１８ｍｍで、長
さが６５ｍｍの円筒型リチウムイオン二次電池（１８６
５０型）に適用し、組立工程におけるかしめ加工による
導通不良の発生や、断防爆機構の作動精度を確認した。DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a new pressure-sensitive shut-off explosion-proof mechanism according to the present invention is applied to a cylindrical lithium ion secondary battery (186 mm in outer diameter of 18 mm and 65 mm in length).
50 type), the occurrence of conduction failure due to caulking in the assembling process, and the operating accuracy of the explosion-proof mechanism were confirmed.
【０００６】図１は、本発明による感圧式遮断防爆機構
を設けた１８６５０型リチウムイオン二次電池の縦断面
図で、電池容器の内圧が遮断防爆規定値未満で、発電要
素８から外部端子板１までが導通している状態を示して
いる。図２は電池容器の内圧が遮断防爆規定値以上に上
昇し、受圧板３と接続板４の接合部１０が破断して離反
し、内部回路が遮断されると同時に、受圧板３に形成さ
れた通気穴３ａから内圧を開放され、防爆弁として作動
している状態を示している。FIG. 1 is a longitudinal sectional view of a 18650 type lithium ion secondary battery provided with a pressure-sensitive type explosion-proof mechanism according to the present invention. 1 shows a state in which conduction is achieved. FIG. 2 shows that the internal pressure of the battery container rises above the cut-off explosion-proof specified value, the joint 10 between the pressure receiving plate 3 and the connecting plate 4 breaks apart, and the internal circuit is cut off. This shows a state in which the internal pressure is released from the vent hole 3a thus opened and the valve operates as an explosion-proof valve.
【０００７】図３は本発明による、２つの部材を冷間圧
接接合後に引き剥がした場合にいずれか一方の部材の接
合部付近に貫通穴を形成する冷間圧接加工法の概略を示
す断面図である。図４は図３に示す冷間圧接加工法で接
合した２つの部材の接合部形状を示す断面図である。図
５は図４に示す２つの部材を引き剥がす際に、特定の一
方の部材に貫通穴が形成される状態を示す断面図であ
る。図１と図２に示される、本事例のリチウムイオン二
次電池の受圧板３と接続板４の冷間圧接接合による接合
部９は、図３に示すように受圧板３側の冷間圧接金型の
加圧工具の先端面積を接続板４側の加圧工具の先端面積
より小さくして加工し、受圧板３と接続板４の接合部９
が破断する際には、受圧板３側に通気穴３ａが形成され
る寸法及び形状としている。FIG. 3 is a cross-sectional view schematically showing a cold pressure welding method for forming a through hole near the joint of one of the two members when the two members are peeled off after the cold pressure welding according to the present invention. It is. FIG. 4 is a cross-sectional view showing the shape of a joint between two members joined by the cold pressing method shown in FIG. FIG. 5 is a cross-sectional view showing a state where a through hole is formed in one specific member when the two members shown in FIG. 4 are peeled off. As shown in FIG. 1 and FIG. 2, the joining portion 9 of the lithium ion secondary battery of the present example, which is formed by cold pressure welding between the pressure receiving plate 3 and the connection plate 4, is cold-welded on the pressure receiving plate 3 side as shown in FIG. 3. The tip area of the pressing tool of the mold is processed to be smaller than the tip area of the pressing tool on the connection plate 4 side, and the joint 9 between the pressure receiving plate 3 and the connection plate 4 is processed.
When the is broken, the size and shape are such that the ventilation hole 3a is formed on the pressure receiving plate 3 side.
【０００８】図１及び図２に示す、電池缶７には発電要
素８が収納され、開口部には外部端子板１、ＰＴＣ２、
受圧板３、絶縁スペーサ１０、接続板４等の部品が、パ
ッキン５に挿入され、電池缶７の開口部を密閉しつつか
しめられている。受圧板３はＰＴＣ２を介して外部端子
板１に接続され、接続板４は絶縁スペーサ１０を挟んで
受圧板３と接合され、タブ６を介して発電要素８に接続
されている。A power generation element 8 is housed in a battery can 7 shown in FIGS. 1 and 2, and an external terminal plate 1, a PTC 2,
Components such as the pressure receiving plate 3, the insulating spacer 10, and the connection plate 4 are inserted into the packing 5 and caulked while sealing the opening of the battery can 7. The pressure receiving plate 3 is connected to the external terminal plate 1 via the PTC 2, the connection plate 4 is joined to the pressure receiving plate 3 via the insulating spacer 10, and is connected to the power generating element 8 via the tab 6.
【０００９】受圧板３と接続板４は予め、絶縁スペーサ
１０を夾んで、中心部を冷間圧接法で接合され、パッキ
ン５に挿入されている。パッキン５に挿入され位置決め
された受圧板３の下面に接合されている絶縁スペーサ１
０と接続板４の最大外径はパッキン５の接続板側内径５
ａより、逃がし寸法１０ａだけ小さい。受圧板３の下面
は、パッキン５の座面上に密着し、上面にはＰＴＣ２と
端子板１が重ねられ、かしめ加工によって、内側に変形
するパッキン５と電池缶７の上部開口端の余肉により挟
み込まれ、パッキン５の座面上に押さえ込まれて、電池
容器内部を密閉しつつ固定されている。The pressure receiving plate 3 and the connection plate 4 are joined in advance by a cold pressure welding method at the center with the insulating spacer 10 interposed therebetween, and inserted into the packing 5. Insulating spacer 1 joined to the lower surface of pressure receiving plate 3 inserted and positioned in packing 5
0 and the maximum outer diameter of the connection plate 4 is the inner diameter 5 of the packing 5 on the connection plate side.
It is smaller by 10 mm than the relief size a. The lower surface of the pressure receiving plate 3 is in close contact with the seating surface of the packing 5, the PTC 2 and the terminal plate 1 are overlapped on the upper surface, and the packing 5 and the extra opening at the upper opening end of the battery can 7 are deformed inward by caulking. , Is pressed onto the seating surface of the packing 5, and is fixed while sealing the inside of the battery container.
【００１０】電池容器内部に生じる圧力は、接続板４の
通気窓を通過して受圧板３の受圧部３ｂの中央に集中
し、受圧板３の中央部が電池容器の外側に向かって変形
する過程において、絶縁スペーサ１０を介して接合部９
を引き剥す方向の応力として接合部９に作用する。電池
容器内部の圧力が、遮断防爆規定値を越えて上昇する
と、受圧板３の接合部９の側近部分が、接続板４に剥ぎ
取られて破断し、同時に通気穴が形成され、受圧板３と
接続板４の導通が遮断されると同時に、形成された通気
穴から遮断防爆規定値を越えた内圧が開放されるのであ
る。The pressure generated inside the battery case passes through the ventilation window of the connecting plate 4 and concentrates at the center of the pressure receiving portion 3b of the pressure receiving plate 3, and the central portion of the pressure receiving plate 3 is deformed toward the outside of the battery case. In the process, the bonding portion 9 is interposed via the insulating spacer 10.
Acts on the joint 9 as a stress in the direction of peeling off. When the pressure inside the battery container rises above the cut-off explosion-proof specified value, a portion near the joint 9 of the pressure receiving plate 3 is peeled off and broken by the connection plate 4, and at the same time, a ventilation hole is formed. At the same time as the conduction of the connection plate 4 is cut off, the internal pressure exceeding the cut-off explosion-proof specified value is released from the formed ventilation hole.
【００１１】本事例では、受圧板３と接続板４の間に絶
縁スペーサ１０を夾み、双方の板の中心を外側から夾み
込む方向に加圧し、双方の板に弾性変形を与えつつ接触
させ、この接点を 遮断防爆設定圧に応じた接合強度で
接合して接合部９とし、異常時に電池容器内の圧力が遮
断防爆設定圧を越えて上昇した場合には、受圧板３と接
続板４の接合部９が破断されて離反し、内部回路が遮断
されると同時に、受圧板３に形成された通気穴から内圧
が開放されて、防爆弁として機能し、その後、電池容器
の内圧が遮断防爆設定圧未満まで低下した後も、受圧板
３と接続板４の間では弾性復元力により一定の距離が保
たれ続け、内部回路の遮断状態と防爆状態が維持される
構造とした。In this case, the insulating spacer 10 is interposed between the pressure receiving plate 3 and the connecting plate 4, and the center of both plates is pressurized in the direction of interposing from outside, and the two plates are brought into contact while elastically deforming. These contacts are joined to each other with a joining strength corresponding to the set explosion-proof pressure to form a joint portion 9. If the pressure in the battery container rises beyond the set pressure for explosion-proof when abnormal, the pressure receiving plate 3 and the connecting plate are connected. At the same time, the internal pressure is released from the ventilation hole formed in the pressure receiving plate 3 to function as an explosion-proof valve, and thereafter, the internal pressure of the battery container is reduced. Even after the pressure drops below the shutoff explosion-proof set pressure, a constant distance is maintained between the pressure receiving plate 3 and the connection plate 4 by the elastic restoring force, so that the shutoff state and the explosionproof state of the internal circuit are maintained.
【００１２】本事例における 遮断防爆設定圧は８ｋｇ
ｆ／ｃｍ2から１２ｋｇｆ／ｃｍ2とした。In this case, the set explosion-proof pressure is 8 kg.
f / cm 2 to 12 kgf / cm 2 .
【００１３】本事例では本発明による、感圧式遮断防爆
機構の作動精度を確認する目的で、図１に示す構造の１
８６５０型リチウムイオン二次電池のテストピース１０
０個を作成した。電池缶８の底部には遮断防爆作動圧を
測定するために直径１．０ｍｍの試験加圧用穴を設け
た。これらのテストピース１００個について、最初に受
圧板３と接続板４の接合部９が、かしめ加工によって破
断しているかを調べる目的で、電池缶７と外部端子板１
の導通を確認した。In this case, in order to confirm the operation accuracy of the pressure-sensitive shut-off explosion-proof mechanism according to the present invention, one of the structures shown in FIG.
Test piece 10 for 8650 type lithium ion secondary battery
0 were made. A test pressure hole having a diameter of 1.0 mm was provided at the bottom of the battery can 8 to measure the shut-off explosion-proof operating pressure. For 100 test pieces, the battery can 7 and the external terminal plate 1 were first tested to check whether the joint 9 between the pressure receiving plate 3 and the connection plate 4 was broken by caulking.
Was confirmed.
【００１４】次に、電池缶８底部の試験加圧用穴から空
気圧を印加し、接合部１０が離反して、電池の内部回路
が遮断されると同時に受圧板３に通気穴３ａが形成され
内圧が開放される瞬間の圧力を計測した。さらに、１時
間経過した後に再度、電池缶７と外部端子板１の導通を
確認した。その結果、１００個のテストピースにおい
て、加圧前の導通テストでは全数に導通不良は無く、空
気圧の印加により、遮断防爆機構が作動して、接合部９
が遮断され、受圧板３に通気穴３ａが形成されて、空気
圧が開放された瞬間の圧力は、最大値で１０．８ｋｇｆ
／ｃｍ2、最小値で９．３ｋｇｆ／ｃｍ2、平均値が１
０．２ｋｇｆ／ｃｍ2であった。又、１時間経過後の導
通テストでは全数が遮断状態を維持しており、発熱や発
火等も認められなかった。Next, air pressure is applied from the test pressurizing hole at the bottom of the battery can 8, the joint 10 is separated, the internal circuit of the battery is shut off, and at the same time, the ventilation hole 3a is formed in the pressure receiving plate 3 to form the internal pressure. The pressure at the moment when was released was measured. Further, after one hour, conduction between the battery can 7 and the external terminal plate 1 was confirmed again. As a result, in 100 test pieces, there was no continuity failure in the continuity test before pressurization, and the shutoff explosion-proof mechanism was activated by the application of air pressure, and the joint 9
Is cut off, a ventilation hole 3a is formed in the pressure receiving plate 3, and the pressure at the moment when the air pressure is released is 10.8 kgf at maximum.
/ Cm 2 , minimum value is 9.3 kgf / cm 2 , average value is 1
It was 0.2 kgf / cm 2 . In addition, in the conduction test after one hour, all of them maintained the cutoff state, and no heat generation or ignition was observed.
【００１５】この結果から本発明による新しい感圧式の
遮断防爆機構は、電池の組立工程におけるかしめ加工
で、受圧板３と接続板４の接合９が損傷を受けて不良を
生じることなく、優れた量産性と作動精度及び安全性を
有することが確認された。From these results, the new pressure-sensitive shut-off explosion-proof mechanism according to the present invention is excellent in that the joint 9 between the pressure receiving plate 3 and the connecting plate 4 is not damaged due to the caulking in the battery assembling process, and no failure occurs. It was confirmed that it had mass productivity, operation accuracy, and safety.
【００１６】本事例では円筒型リチウムイオン二次電池
へ本発明を適用した事例について説明したが、角型リチ
ウムイオン二次電池についても同等の構造で本発明を適
用できることが確認されており、リチウムイオン二次電
池に限らず、その他全ての密閉型電池にも適用が可能で
ある。In this case, an example in which the present invention is applied to a cylindrical lithium ion secondary battery has been described. However, it has been confirmed that the present invention can be applied to a prismatic lithium ion secondary battery with an equivalent structure. The invention can be applied not only to the ion secondary battery but also to all other sealed batteries.
【００１７】[0017]
【発明の効果】本発明により、特願平１１−３５９４９
号に開示される発明の問題点として提起されていた、封
口体ユニットを電池缶の開口部に挿入して、かしめる際
に、パッキンの変形に伴って受圧板と接続板の接合強度
が劣化して作動精度が低下したり、接合部が破断する等
の問題が解決され、感圧式回路遮断機構と開裂式安全弁
の両方を合わせ持つ、高精度で高い安全性を有する保安
機構が、歩溜まり良く量産できるようになった。According to the present invention, Japanese Patent Application No. 11-35949 is disclosed.
When the sealing unit was inserted into the opening of the battery can and crimped, the joint strength between the pressure receiving plate and the connection plate deteriorated due to deformation of the packing, which was proposed as a problem of the invention disclosed in Problems such as reduced operating accuracy and breakage of joints have been solved, and a high-precision and high-security safety mechanism that combines both a pressure-sensitive circuit shut-off mechanism and a split-type safety valve It has become possible to mass-produce well.
【図１】本発明による新しい感圧式遮断防爆機構を設置
した、リチウムイオン二次電池において、内圧が遮断防
爆規定値に満たない状態を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing a state in which an internal pressure of a lithium ion secondary battery provided with a new pressure-sensitive shut-off explosion-proof mechanism according to the present invention is less than a shut-off explosion-proof specified value.
【図２】本発明による新しい感圧式遮断防爆機構を設置
した、リチウムイオン二次電池において、内圧が遮断防
爆規定値を越えて、感圧式遮断防爆機構が作動した状態
を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a state in which a pressure-sensitive shut-off explosion-proof mechanism is activated when the internal pressure exceeds a shut-off explosion-proof specified value in a lithium ion secondary battery in which a new pressure-sensitive shut-off explosion-proof mechanism according to the present invention is installed. .
【図３】接合部を引き剥した場合に、特定のいずれか一
方の部材に貫通穴を形成させることを目的とした冷間圧
接加工法を示す、縦断面図である。FIG. 3 is a vertical cross-sectional view showing a cold pressing method for forming a through hole in one of specific members when a joint is peeled off.
【図４】接合部を引き剥した場合に、特定のいずれか一
方の部材に貫通穴を形成させることを目的として冷間圧
接接合された２つの部材の、縦断面図である。FIG. 4 is a vertical cross-sectional view of two members that have been cold-welded for the purpose of forming a through hole in one of the specific members when the joint is peeled off.
【図５】接合部を引き剥した場合に、特定のいずれか一
方の部材に貫通穴を形成させることを目的として冷間圧
接接合された２つの部材が、引き剥され貫通穴が形成さ
れた状態を示す縦断面図FIG. 5 is a diagram illustrating a case where two members that have been cold-welded for the purpose of forming a through hole in one specific member when a joint portion is peeled off are peeled off to form a through hole; Longitudinal sectional view showing the state
１．外部端子板 ２．ＰＴＣ ３．受圧板 ３ａ．通気穴 ３ｂ．受圧部 ４．接続板 ５．パッキン ５ａ．接続板側内径 ６．タブ ７．電池缶 ８．発電要素 ９．接合部 １０．絶縁スペーサ １０ａ．逃がし寸法 1. External terminal board 2. 2. PTC Pressure receiving plate 3a. Vent hole 3b. Pressure receiving part 4. Connection plate 5. Packing 5a. Connection plate inner diameter 6. Tab 7. Battery can 8 Power generation element 9. Joint 10. Insulating spacer 10a. Escape dimensions
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１１年９月２９日（１９９９．９．２
９）[Submission date] September 29, 1999 (1999.9.2)
9)
【手続補正２】[Procedure amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 密閉型電池の保安機構[Title of the Invention] Security mechanism of sealed battery
【特許請求の範囲】[Claims]
【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の内圧
が、何等かの異常により、保安上の規定値を越えて上昇
した場合に、電池容器が過大に変形したり、爆発したり
する事を防止する保安機構に関する。BACKGROUND OF THE INVENTION The present invention relates to a battery container that is excessively deformed or explodes when the internal pressure of a sealed battery rises above a specified value for security due to some abnormality. And a security mechanism for preventing
【０００２】[0002]
【従来の技術】近年、携帯型機器の、高機能化や小型軽
量化にともない、リチウムイオン二次電池等の小型軽量
を特長とする密閉型の高性能二次電池が普及している。
これらの高性能二次電池は過充電や短絡によって、電池
容器の内圧が上昇し、電池容器が過大に変形して周辺の
機器を破損したり、爆発によって人体に危害を与える危
険性がある。この様な危険を回避する目的で、電池内部
の温度上昇に反応して電池の内部回路を遮断する感温抵
抗素子（ＰＴＣ）を使用したり、電池容器の異常な内圧
で、機械的に電池の内部回路を遮断する回路遮断機構、
さらに電池容器の異常な内圧で、電池容器の一部に通気
穴を形成し、異常な内圧を開放する開裂式安全弁等の保
安機構が考案され実用化されており、密閉型電池内部に
発生する異常な圧力により、電池内に収納される発電要
素から外部端子に至る内部回路を遮断する回路遮断機能
と、電池容器の一部に通気穴を形成して異常な内圧を開
放する開裂式の防爆機能を合わせ持つ、特願平１１−３
５９４９号が開示されている。2. Description of the Related Art In recent years, with the advancement of functions and miniaturization of portable devices, sealed high-performance secondary batteries, such as lithium ion secondary batteries, which are characterized by small size and light weight, have become widespread.
In these high-performance secondary batteries, the internal pressure of the battery container increases due to overcharging or short-circuit, and the battery container may be excessively deformed, causing damage to peripheral devices, or causing harm to the human body due to explosion. In order to avoid such danger, use a temperature-sensitive resistance element (PTC) that shuts off the internal circuit of the battery in response to a rise in the temperature inside the battery, or mechanically operates the battery by abnormal internal pressure of the battery container. Circuit cut-off mechanism to cut off the internal circuit of the
In addition, a safety mechanism such as a rupture-type safety valve that forms a vent hole in a part of the battery container at the abnormal internal pressure of the battery container and releases the abnormal internal pressure has been devised and put into practical use, and is generated inside the sealed battery. A circuit shutoff function that shuts off the internal circuit from the power generation element housed in the battery to the external terminal due to abnormal pressure, and a tear-off explosion-proof that opens a vent hole in a part of the battery container to release abnormal internal pressure Japanese Patent Application No. 11-3 with functions
No. 5949 is disclosed.
【０００３】[0003]
【発明が解決しようとする課題】密閉型電池の保安機構
として、密閉型電池内部に発生する異常な圧力により、
電池内に収納される発電要素から外部端子に至る内部回
路を遮断する回路遮断機能と、電池容器の一部に通気穴
を形成して異常な内圧を開放する開裂式の防爆機能を合
わせ持つ、特願平１１−３５９４９号が開示されている
が、この方法ではパッキンの一部に、内側に張り出した
絶縁リブ部を設けてこの絶縁リブ部を夾んで受圧板と接
続板を接合しているために、電池の組立工程において、
パッキンの内側に端子板、ＰＴＣ、受圧板、接続板等を
組み込んだ封口体ユニットを電池缶の開口部に挿入し
て、かしめる際に、パッキンの変形に伴って受圧板と接
続板の接合強度が劣化し、作動精度が低下したり、接合
部が破断してしまう問題が存在し、これらの解決が求め
られていた。SUMMARY OF THE INVENTION As a security mechanism for a sealed battery, an abnormal pressure generated inside the sealed battery causes
It has both a circuit shut-off function that shuts off the internal circuit from the power generation element housed in the battery to the external terminal, and a tear-off explosion-proof function that opens a vent hole in part of the battery container to release abnormal internal pressure. Japanese Patent Application No. 11-35949 is disclosed, but in this method, an insulating rib portion protruding inward is provided in a part of the packing, and the pressure receiving plate and the connection plate are joined together by sandwiching the insulating rib portion. In the battery assembly process,
When the sealing unit with the terminal plate, PTC, pressure receiving plate, connection plate, etc. incorporated inside the packing is inserted into the opening of the battery can and crimped, the pressure receiving plate and the connection plate are joined together with the deformation of the packing. There are problems that the strength is deteriorated, the operation accuracy is reduced, and the joint is broken, and these solutions have been demanded.
【０００４】[0004]
【課題を解決するための手段】本発明では、特願平１１
−３５９４９号におけるパッキンから絶縁リブを削除
し、新たに、受圧板３と接続板４の接合部９以外を絶縁
に保ちつつ、電池容器の内圧が規定値を越えて上昇した
場合には、受圧板３の受圧部３ｂがこの内圧を受けて電
池容器の外側に向かって変形する応力を、接合部９に作
用させ、受圧板３に通気穴３ａを形成しつつ受圧板３と
接続板４を離反させ遮断する機能を有する絶縁スペーサ
１０を考案し、受圧板３と接続板４の間に組み込むこと
により、特願平１１−３５９４９号に開示される発明の
問題点として提起されていた、封口体ユニットを電池缶
の開口部に挿入して、かしめる際に、パッキンの変形に
伴って受圧板と接続板の接合強度が劣化して作動精度が
低下したり、接合部が破断する等の問題を解決したので
ある。According to the present invention, Japanese Patent Application No. Hei 11
In the case where the internal pressure of the battery container rises above a specified value while removing the insulating ribs from the packing in JP-A-359949 and maintaining the insulation except for the joint 9 between the pressure receiving plate 3 and the connecting plate 4, the pressure receiving pressure is increased. The pressure receiving portion 3b of the plate 3 receives the internal pressure and applies a stress that is deformed toward the outside of the battery container to the joining portion 9 so that the pressure receiving plate 3 and the connection plate 4 are formed while forming the ventilation hole 3a in the pressure receiving plate 3. By devising an insulating spacer 10 having a function of separating and blocking, and incorporating the insulating spacer between the pressure receiving plate 3 and the connecting plate 4, the sealing disclosed as a problem of the invention disclosed in Japanese Patent Application No. 11-35949 is proposed. When the body unit is inserted into the opening of the battery can and swaged, the joint strength between the pressure receiving plate and the connection plate is deteriorated due to the deformation of the packing and the operation accuracy is reduced, and the joint is broken. The problem was solved.
【０００５】[0005]
【発明の実施の形態】本実施例では、本発明による新し
い感圧式遮断防爆機構を、電池の外径が１８ｍｍで、長
さが６５ｍｍの円筒型リチウムイオン二次電池（１８６
５０型）に適用し、組立工程におけるかしめ加工による
導通不良の発生や、遮断防爆機構の作動精度を確認し
た。DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a new pressure-sensitive shut-off explosion-proof mechanism according to the present invention is applied to a cylindrical lithium ion secondary battery (186 mm in outer diameter of 18 mm and 65 mm in length).
50 type), and the occurrence of conduction failure due to caulking in the assembly process and the operation accuracy of the shutoff explosion-proof mechanism were confirmed.
【０００６】図１は、本発明による感圧式遮断防爆機構
を設けた１８６５０型リチウムイオン二次電池の縦断面
図で、電池容器の内圧が遮断防爆規定値未満で、発電要
素８から外部端子板１までが導通している状態を示して
いる。図２は電池容器の内圧が遮断防爆規定値以上に上
昇し、受圧板３と接続板４の接合部９が破断して離反
し、内部回路が遮断されると同時に、受圧板３に形成さ
れた通気穴３ａから内圧を開放され、防爆弁として作動
している状態を示している。FIG. 1 is a longitudinal sectional view of a 18650 type lithium ion secondary battery provided with a pressure-sensitive type explosion-proof mechanism according to the present invention. 1 shows a state in which conduction is achieved. FIG. 2 shows that the internal pressure of the battery container rises above the cut-off explosion-proof specified value, the joint 9 between the pressure receiving plate 3 and the connection plate 4 breaks and separates, and the internal circuit is cut off. This shows a state in which the internal pressure is released from the vent hole 3a thus opened and the valve operates as an explosion-proof valve.
【０００７】図３は本発明による、２つの部材を冷間圧
接接合後に引き剥がした場合にいずれか一方の部材の接
合部付近に貫通穴を形成する冷間圧接加工法の概略を示
す断面図である。図４は図３に示す冷間圧接加工法で接
合した２つの部材の接合部形状を示す断面図である。図
５は図４に示す２つの部材を引き剥がす際に、特定の一
方の部材に貫通穴が形成される状態を示す断面図であ
る。図１と図２に示される、本事例のリチウムイオン二
次電池の受圧板３と接続板４の冷間圧接接合による接合
部９は、図３に示すように受圧板３側の冷間圧接金型の
加圧工具の先端面積を接続板４側の加圧工具の先端面積
より小さくして加工し、受圧板３と接続板４の接合部９
が破断する際には、受圧板３側に通気穴３ａが形成され
る寸法及び形状としている。FIG. 3 is a cross-sectional view schematically showing a cold pressure welding method for forming a through hole near the joint of one of the two members when the two members are peeled off after the cold pressure welding according to the present invention. It is. FIG. 4 is a cross-sectional view showing the shape of a joint between two members joined by the cold pressing method shown in FIG. FIG. 5 is a cross-sectional view showing a state where a through hole is formed in one specific member when the two members shown in FIG. 4 are peeled off. As shown in FIG. 1 and FIG. 2, the joining portion 9 of the lithium ion secondary battery of the present example, which is formed by cold pressure welding between the pressure receiving plate 3 and the connection plate 4, is cold-welded on the pressure receiving plate 3 side as shown in FIG. 3. The tip area of the pressing tool of the mold is processed to be smaller than the tip area of the pressing tool on the connection plate 4 side, and the joint 9 between the pressure receiving plate 3 and the connection plate 4 is processed.
When the is broken, the size and shape are such that the ventilation hole 3a is formed on the pressure receiving plate 3 side.
【０００８】図１及び図２に示す、電池缶７には発電要
素８が収納され、開口部には外部端子板１、ＰＴＣ２、
受圧板３、絶縁スペーサ１０、接続板４等の部品が、パ
ッキン５に挿入され、電池缶７の開口部を密閉しつつか
しめられている。受圧板３はＰＴＣ２を介して外部端子
板１に接続され、接続板４は絶縁スペーサ１０を挟んで
受圧板３と接合され、タブ６を介して発電要素８に接続
されている。A power generation element 8 is housed in a battery can 7 shown in FIGS. 1 and 2, and an external terminal plate 1, a PTC 2,
Components such as the pressure receiving plate 3, the insulating spacer 10, and the connection plate 4 are inserted into the packing 5 and caulked while sealing the opening of the battery can 7. The pressure receiving plate 3 is connected to the external terminal plate 1 via the PTC 2, the connection plate 4 is joined to the pressure receiving plate 3 via the insulating spacer 10, and is connected to the power generating element 8 via the tab 6.
【０００９】受圧板３と接続板４は予め、絶縁スペーサ
１０を夾んで、中心部を冷間圧接法で接合され、パッキ
ン５に挿入されている。パッキン５に挿入され位置決め
された受圧板３の下面に接合されている絶縁スペーサ１
０と接続板４の最大外径はパッキン５の接続板側内径５
ａより、逃がし寸法１０ａだけ小さい。受圧板３の下面
は、パッキン５の座面上に密着し、上面にはＰＴＣ２と
端子板１が重ねられ、かしめ加工によって、内側に変形
するパッキン５と電池缶７の上部開口端の余肉により挟
み込まれ、パッキン５の座面上に押さえ込まれて、電池
容器内部を密閉しつつ固定されている。The pressure receiving plate 3 and the connection plate 4 are joined in advance by a cold pressure welding method at the center with the insulating spacer 10 interposed therebetween, and inserted into the packing 5. Insulating spacer 1 joined to the lower surface of pressure receiving plate 3 inserted and positioned in packing 5
0 and the maximum outer diameter of the connection plate 4 is the inner diameter 5 of the packing 5 on the connection plate side.
It is smaller by 10 mm than the relief size a. The lower surface of the pressure receiving plate 3 is in close contact with the seating surface of the packing 5, the PTC 2 and the terminal plate 1 are overlapped on the upper surface, and the packing 5 and the extra opening at the upper opening end of the battery can 7 are deformed inward by caulking. , Is pressed onto the seating surface of the packing 5, and is fixed while sealing the inside of the battery container.
【００１０】電池容器内部に生じる圧力は、接続板４の
通気窓を通過して受圧板３の受圧部３ｂの中央に集中
し、受圧板３の中央部が電池容器の外側に向かって変形
する過程において、絶縁スペーサ１０を介して接合部９
を引き剥す方向の応力として接合部９に作用する。電池
容器内部の圧力が、遮断防爆規定値を越えて上昇する
と、受圧板３の接合部９の側近部分が、接続板４に剥ぎ
取られて破断し、同時に通気穴３ａが形成され、受圧板
３と接続板４の導通が遮断されると同時に、形成された
通気穴３ａから遮断防爆規定値を越えた内圧が開放され
るのである。The pressure generated inside the battery case passes through the ventilation window of the connecting plate 4 and concentrates at the center of the pressure receiving portion 3b of the pressure receiving plate 3, and the central portion of the pressure receiving plate 3 is deformed toward the outside of the battery case. In the process, the bonding portion 9 is interposed via the insulating spacer 10.
Acts on the joint 9 as a stress in the direction of peeling off. When the pressure inside the battery container rises above the shut-off explosion-proof specified value, a portion near the joint 9 of the pressure receiving plate 3 is peeled off and broken by the connection plate 4, and at the same time, the ventilation hole 3a is formed. At the same time as the conduction between the connection plate 3 and the connection plate 4 is cut off, the internal pressure exceeding the cut-off explosion-proof specified value is released from the formed ventilation hole 3a.
【００１１】本事例では、受圧板３と接続板４の間に絶
縁スペーサ１０を夾み、双方の板の中心を外側から夾み
込む方向に加圧し、双方の板に弾性変形を与えつつ接触
させ、この接点を 遮断防爆設定圧に応じた接合強度で
接合して接合部９とし、異常時に電池容器内の圧力が遮
断防爆設定圧を越えて上昇した場合には、受圧板３と接
続板４の接合部９が破断されて離反し、内部回路が遮断
されると同時に、受圧板３に形成された通気穴３aから
内圧が開放されて、防爆弁として機能し、その後、電池
容器の内圧が遮断防爆設定圧未満まで低下した後も、受
圧板３と接続板４の間では弾性復元力により一定の距離
が保たれ続け、内部回路の遮断状態と防爆状態が維持さ
れる構造となっている。In this case, the insulating spacer 10 is interposed between the pressure receiving plate 3 and the connecting plate 4, and the center of both plates is pressurized in the direction of interposing from outside, and the two plates are brought into contact while elastically deforming. These contacts are joined to each other with a joining strength corresponding to the set explosion-proof pressure to form a joint portion 9. If the pressure in the battery container rises beyond the set pressure for explosion-proof when abnormal, the pressure receiving plate 3 and the connecting plate are connected. At the same time, the internal pressure is released from the vent hole 3a formed in the pressure receiving plate 3 to function as an explosion-proof valve. Even after the pressure drops below the shut-off explosion-proof set pressure, a certain distance is maintained between the pressure receiving plate 3 and the connection plate 4 by the elastic restoring force, so that the shut-off state and the explosion-proof state of the internal circuit are maintained. I have.
【００１２】本事例における 遮断防爆設定圧は８ｋｇ
ｆ／ｃｍ２から１２ｋｇｆ／ｃｍ２とした。In this case, the set explosion-proof pressure is 8 kg.
f / cm2 to 12 kgf / cm2.
【００１３】本事例では本発明による、感圧式遮断防爆
機構の作動精度を確認する目的で、図１に示す構造の１
８６５０型リチウムイオン二次電池のテストピース１０
０個を作成した。電池缶８の底部には遮断防爆作動圧を
測定するために直径１．０ｍｍの試験加圧用穴を設け
た。これらのテストピース１００個について、最初に受
圧板３と接続板４の接合部９が、かしめ加工によって破
断しているかを調べる目的で、電池缶７と外部端子板１
の導通を確認した。In this case, in order to confirm the operation accuracy of the pressure-sensitive shut-off explosion-proof mechanism according to the present invention, one of the structures shown in FIG.
Test piece 10 for 8650 type lithium ion secondary battery
0 were made. A test pressure hole having a diameter of 1.0 mm was provided at the bottom of the battery can 8 to measure the shut-off explosion-proof operating pressure. For 100 test pieces, the battery can 7 and the external terminal plate 1 were first tested to check whether the joint 9 between the pressure receiving plate 3 and the connection plate 4 was broken by caulking.
Was confirmed.
【００１４】次に、電池缶８底部の試験加圧用穴から空
気圧を印加し、接合部１０が離反して、電池の内部回路
が遮断されると同時に受圧板３に通気穴が３ａが形成さ
れ内圧が開放される瞬間の圧力を計測した。さらに、１
時間経過した後に再度、電池缶７と外部端子板１の導通
を確認した。その結果、１００個のテストピースにおい
て、加圧前の導通テストでは全数に導通不良は無く、空
気圧の印加により、遮断防爆機構が作動して、接合部９
が遮断され、受圧板３に通気穴３ａが形成されて、空気
圧が開放された瞬間の圧力は、最大値で１０．８ｋｇｆ
／ｃｍ２、最小値で９．３ｋｇｆ／ｃｍ２、平均値が１
０．２ｋｇｆ／ｃｍ２であった。又、１時間経過後の導
通テストでは全数が遮断状態を維持しており、発熱や発
火等も認められなかった。Next, air pressure is applied from the test pressurizing hole at the bottom of the battery can 8 to separate the joint portion 10 and cut off the internal circuit of the battery, and at the same time, a ventilation hole 3a is formed in the pressure receiving plate 3. The pressure at the moment when the internal pressure was released was measured. In addition, 1
After a lapse of time, conduction between the battery can 7 and the external terminal plate 1 was confirmed again. As a result, in 100 test pieces, there was no continuity failure in the continuity test before pressurization, and the shutoff explosion-proof mechanism was activated by the application of air pressure, and the joint 9
Is cut off, a ventilation hole 3a is formed in the pressure receiving plate 3, and the pressure at the moment when the air pressure is released is 10.8 kgf at maximum.
/ Cm2, minimum value is 9.3 kgf / cm2, average value is 1
It was 0.2 kgf / cm2. In addition, in the conduction test after one hour, all of them maintained the cutoff state, and no heat generation or ignition was observed.
【００１５】この結果から本発明による新しい感圧式の
遮断防爆機構は、電池の組立工程におけるかしめ加工
で、受圧板３と接続板４の接合９が損傷を受けて不良を
生じることなく、優れた量産性と作動精度及び安全性を
有することが確認された。From these results, the new pressure-sensitive shut-off explosion-proof mechanism according to the present invention is excellent in that the joint 9 between the pressure receiving plate 3 and the connecting plate 4 is not damaged due to the caulking in the battery assembling process, and no failure occurs. It was confirmed that it had mass productivity, operation accuracy, and safety.
【００１６】本事例では円筒型リチウムイオン二次電池
へ本発明を適用した事例について説明したが、角型リチ
ウムイオン二次電池についても同等の構造で本発明を適
用できることが確認されており、リチウムイオン二次電
池に限らず、その他全ての密閉型電池にも適用が可能で
ある。In this case, an example in which the present invention is applied to a cylindrical lithium ion secondary battery has been described. However, it has been confirmed that the present invention can be applied to a prismatic lithium ion secondary battery with an equivalent structure. The invention can be applied not only to the ion secondary battery but also to all other sealed batteries.
【００１７】[0017]
【発明の効果】本発明により、特願平１１−３５９４９
号に開示される発明の問題点として提起されていた、封
口体ユニットを電池缶の開口部に挿入して、かしめる際
に、パッキンの変形に伴って受圧板と接続板の接合強度
が劣化して作動精度が低下したり、接合部が破断する等
の問題が解決され、感圧式回路遮断機構と開裂式安全弁
の両方を合わせ持つ、高精度で高い安全性を有する保安
機構が、歩溜まり良く量産できるようになった。According to the present invention, Japanese Patent Application No. 11-35949 is disclosed.
When the sealing unit was inserted into the opening of the battery can and crimped, the joint strength between the pressure receiving plate and the connection plate deteriorated due to deformation of the packing, which was proposed as a problem of the invention disclosed in Problems such as reduced operating accuracy and breakage of joints have been solved, and a high-precision and high-security safety mechanism that combines both a pressure-sensitive circuit shut-off mechanism and a split-type safety valve It has become possible to mass-produce well.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明による新しい感圧式遮断防爆機構を設置
した、リチウムイオン二次電池において、内圧が遮断防
爆規定値に満たない状態を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing a state in which an internal pressure of a lithium ion secondary battery provided with a new pressure-sensitive shut-off explosion-proof mechanism according to the present invention is less than a shut-off explosion-proof specified value.
【図２】本発明による新しい感圧式遮断防爆機構を設置
した、リチウムイオン二次電池において、内圧が遮断防
爆規定値を越えて、感圧式遮断防爆機構が作動した状態
を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a state in which a pressure-sensitive shut-off explosion-proof mechanism is activated when the internal pressure exceeds a shut-off explosion-proof specified value in a lithium ion secondary battery in which a new pressure-sensitive shut-off explosion-proof mechanism according to the present invention is installed. .
【図３】接合部を引き剥した場合に、特定のいずれか一
方の部材に貫通穴を形成させることを目的とした冷間圧
接加工法を示す、縦断面図である。FIG. 3 is a vertical cross-sectional view showing a cold pressing method for forming a through hole in one of specific members when a joint is peeled off.
【図４】接合部を引き剥した場合に、特定のいずれか一
方の部材に貫通穴を形成させることを目的として冷間圧
接接合された２つの部材の、縦断面図である。FIG. 4 is a vertical cross-sectional view of two members that have been cold-welded for the purpose of forming a through hole in one of the specific members when the joint is peeled off.
【図５】接合部を引き剥した場合に、特定のいずれか一
方の部材に貫通穴を形成させることを目的として冷間圧
接接合された２つの部材が、引き剥され貫通穴が形成さ
れた状態を示す縦断面図FIG. 5 is a diagram illustrating a case where two members that have been cold-welded for the purpose of forming a through hole in one specific member when a joint portion is peeled off are peeled off to form a through hole; Longitudinal sectional view showing the state
【符号の説明】 １．外部端子板 ２．ＰＴＣ ３．受圧板 ３ａ．通気穴 ３ｂ．受圧部 ４．接続板 ５．パッキン ５ａ．接続板側内径 ６．タブ ７．電池缶 ８．発電要素 ９．接合部 １０．絶縁スペーサ １０ａ．逃がし寸法[Explanation of Codes] External terminal board 2. 2. PTC Pressure receiving plate 3a. Vent hole 3b. Pressure receiving part 4. Connection plate 5. Packing 5a. Connection plate inner diameter 6. Tab 7. Battery can 8 Power generation element 9. Joint 10. Insulating spacer 10a. Escape dimensions
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H012 AA01 BB02 BB11 DD01 DD05 EE04 FF01 GG01 JJ01 JJ06 5H022 AA09 BB03 BB19 CC12 CC16 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H012 AA01 BB02 BB11 DD01 DD05 EE04 FF01 GG01 JJ01 JJ06 5H022 AA09 BB03 BB19 CC12 CC16
Claims (5)
電池缶（７）の開口部を密閉する受圧板（３）と、受圧
板（３）の電池容器内側の側近に、パッキン（５）の接
続板側内径（５ａ）より、逃がし寸法（１０ａ）だけ小
さい絶縁スペーサ（１０）を介して向かい合わせて位置
決めされ、外形がパッキン（５）の接続板側内径（５
ａ）より、逃がし寸法（１０ａ）以上小さく、発電要素
（８）に接続され導通している接続板（４）の一部を、
接合して接合部（９）とし、電池容器の内圧が正常な状
態にある時は、発電要素（８）から外部端子板（１）ま
でを導通状態に保ち、電池容器の内圧が遮断防爆設定圧
を越えて上昇した場合には、この内圧が、受圧部（３
ｂ）に作用して、接合部（９）側近の受圧板（３）の一
部が接続板（４）に接合されたままの状態で接続板
（４）側に剥ぎ取られて破断し、通気穴（３ａ）が形成
され、防爆弁として機能すると同時に、受圧板（３）と
接続板（４）が離反して遮断状態となり、発電要素
（８）から外部端子板（１）までの内部回路を遮断する
機能を併せ持つ密閉型電池の保安機構。1. Conductivity to an external terminal plate (1) of a sealed battery,
A pressure receiving plate (3) that seals the opening of the battery can (7), and a relief size (10a) near the pressure receiving plate (3) inside the battery container from the inner diameter (5a) of the packing (5) on the connection plate side. Are positioned so as to face each other via a small insulating spacer (10), and the outer shape is the inner diameter (5) of the packing (5) on the connection plate side.
A part of the connection plate (4) which is smaller than the relief size (10a) by more than a) and is connected to the power generation element (8) and is conducting,
When the internal pressure of the battery container is in a normal state, the connection from the power generating element (8) to the external terminal plate (1) is maintained in a conductive state, and the internal pressure of the battery container is set to the explosion-proof setting. When the pressure rises beyond the pressure, the internal pressure is
b), a part of the pressure receiving plate (3) near the joint (9) is peeled off to the connection plate (4) side while being joined to the connection plate (4), and broken. A ventilation hole (3a) is formed to function as an explosion-proof valve, and at the same time, the pressure receiving plate (3) and the connecting plate (4) are separated from each other to be in a cutoff state, so that the internal space from the power generating element (8) to the external terminal plate (1) is reduced. A sealed battery security mechanism that also has the function of shutting off the circuit.
おいて、受圧板（３）と接続板（４）を接合する際に、
双方の板を外側から夾み込む方向に加圧し、双方の板に
弾性変形を与えつつ接触させ、この接点を遮断防爆設定
圧に応じた接合強度で接合して接合部（９）とし、異常
時に電池容器の内圧が遮断防爆設定圧を越えて上昇し、
受圧板（３）と接続板（４）の接合部（９）が破断され
て離反すると同時に、形成された通気穴（３ａ）から異
常な内圧が解放された後も、受圧板（３）と接続板
（４）は弾性復元力により一定の距離を保って離反状態
を維持し続け、二次的な災害を防止する特長を有する密
閉型電池の保安機構。2. The security mechanism for a sealed battery according to claim 1, wherein when the pressure receiving plate (3) and the connecting plate (4) are joined to each other.
Both plates are pressurized in the direction of being inserted from the outside, and they are brought into contact with each other while giving elastic deformation to both plates. These contacts are joined at a joining strength according to the set explosion-proof pressure to form a joint (9). At times, the internal pressure of the battery container rises above the shut-off explosion-proof set pressure,
The joint (9) between the pressure receiving plate (3) and the connection plate (4) is broken and separated, and at the same time, after the abnormal internal pressure is released from the formed ventilation hole (3a), the connection between the pressure receiving plate (3) and the pressure receiving plate (3) is maintained. The connection plate (4) is a security mechanism for a sealed battery having a feature of keeping a separated state by keeping a certain distance by an elastic restoring force and preventing a secondary disaster.
おいて、受圧板（３）と接続板（４）の接合部（９）を
冷間圧接法で接合する際に、冷間圧接金型の受圧板
（３）側の加圧工具の歯先面積を、接続板（４）側の加
圧工具の歯先面積より小さくし、受圧板（３）側の接合
部側近の板厚を接続板（４）の接合部側近の板厚より薄
くして、受圧板（３）の受圧部（３ｂ）が電池容器内に
発生した異常な内圧を受けて、電池容器の外側に変形す
る際に、接続板（４）との接合部（９）が破断して、受
厚板（３）と接続板（４）が離反する際に、受圧板
（３）側に確実に通気穴（３ａ）を形成する冷間圧接
法。3. The safety mechanism for a sealed battery according to claim 1, wherein when the joining portion (9) of the pressure receiving plate (3) and the connecting plate (4) is joined by cold welding. The tip area of the pressure tool on the pressure receiving plate (3) side of the mold is made smaller than the tooth tip area of the pressure tool on the connection plate (4) side, and the plate thickness near the joining portion side on the pressure receiving plate (3) side. Is thinner than the plate thickness near the joint of the connection plate (4), and the pressure receiving portion (3b) of the pressure receiving plate (3) receives an abnormal internal pressure generated in the battery container and deforms to the outside of the battery container. At this time, when the joint (9) with the connecting plate (4) is broken and the thick plate (3) and the connecting plate (4) are separated from each other, the vent hole (3) is surely formed on the pressure receiving plate (3) side. Cold welding to form 3a).
おいて、受圧板（３）と接続板（４）を冷間圧接法で接
合したことを特長とする密閉型電池の保安機構。4. The safety mechanism for a sealed battery according to claim 1, wherein the pressure receiving plate (3) and the connection plate (4) are joined by a cold pressure welding method.
接接合する際に、一方の部材側を加圧する工具の歯先面
積を、他方の部材を加圧する工具の歯先面積より小さく
して、冷間圧接加工時の部材へのくい込み量を、他方の
部材へのくい込み量より小さくした状態で接合し、その
後２つの部材を引き剥がす際には、金型の歯先面積を小
さくした側の部材の接合部側近が、他方の部材に接合さ
れたまま剥ぎ取られ、貫通穴が形成される特長を有する
冷間圧接加工法。5. The tip area of a tool that presses one member side is smaller than the tip area of a tool that presses the other member when the two members are pressurized so as to sandwich them and cold press-welded. Then, in the state where the amount of penetration into the member at the time of cold pressure welding is smaller than the amount of penetration into the other member, and then, when the two members are peeled off, the tip area of the mold is reduced. A cold pressure welding method having a feature that a portion near a joining portion of a member on the side where the member is joined is peeled off while being joined to the other member to form a through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11208376A JP2000306565A (en) | 1999-02-15 | 1999-07-23 | Safety mechanism of sealed type battery |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3594999 | 1999-02-15 | ||
| JP11-35949 | 1999-02-15 | ||
| JP11208376A JP2000306565A (en) | 1999-02-15 | 1999-07-23 | Safety mechanism of sealed type battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000306565A true JP2000306565A (en) | 2000-11-02 |
Family
ID=26374967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11208376A Pending JP2000306565A (en) | 1999-02-15 | 1999-07-23 | Safety mechanism of sealed type battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000306565A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101010817B (en) * | 2004-08-11 | 2013-03-27 | 日本电气株式会社 | Film-enclosed electric device and production method therefor |
| JP5629789B2 (en) * | 2011-02-16 | 2014-11-26 | パナソニック株式会社 | Battery and battery manufacturing method |
| CN113169398A (en) * | 2018-12-28 | 2021-07-23 | 三洋电机株式会社 | Sealed battery |
-
1999
- 1999-07-23 JP JP11208376A patent/JP2000306565A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101010817B (en) * | 2004-08-11 | 2013-03-27 | 日本电气株式会社 | Film-enclosed electric device and production method therefor |
| JP5629789B2 (en) * | 2011-02-16 | 2014-11-26 | パナソニック株式会社 | Battery and battery manufacturing method |
| US10658633B2 (en) | 2011-02-16 | 2020-05-19 | Panasonic Intellectual Property Management Co., Ltd. | Battery and manufacturing method of the battery |
| CN113169398A (en) * | 2018-12-28 | 2021-07-23 | 三洋电机株式会社 | Sealed battery |
| CN113169398B (en) * | 2018-12-28 | 2023-04-25 | 三洋电机株式会社 | Sealed battery |
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