JP6523722B2 - Sealing plate of cylindrical battery and cylindrical battery - Google Patents

Sealing plate of cylindrical battery and cylindrical battery Download PDF

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JP6523722B2
JP6523722B2 JP2015054947A JP2015054947A JP6523722B2 JP 6523722 B2 JP6523722 B2 JP 6523722B2 JP 2015054947 A JP2015054947 A JP 2015054947A JP 2015054947 A JP2015054947 A JP 2015054947A JP 6523722 B2 JP6523722 B2 JP 6523722B2
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sealing plate
battery
thin portion
thin
cylindrical battery
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JP2016177877A (en
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孝英 小橋
孝英 小橋
西口　信博
信博 西口
賢 砂田
賢 砂田
佳恵 飯田
佳恵 飯田
翔平 板垣
翔平 板垣
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FDK Corp
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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

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Description

本発明は、筒型電池の封口板及び筒型電池に関する。   The present invention relates to a sealing plate of a cylindrical battery and a cylindrical battery.

筒型電池は、各種電気機器の電源用電池として広く使用されている。筒型電池は、発電要素を収容している有底筒型電池缶の開口部を当該電池缶を封止するための金属製封口板で封口し、電極端子板を取り付けてなる基本構造を有している。筒型電池は、逆接続等により電池内圧が上昇した場合の安全策として、上昇した内圧を外部に逃がす機構を設けている。例えば特許文献１には、図２に例示されているように、円筒型電池において、金属からなる封口板２０ａの表面にＶ字溝形状等の薄肉部２１を設け、電池１ａ内の内圧が異常上昇した際に、薄肉部２１が先行破断して内圧を開放するように構成されている。   Cylindrical batteries are widely used as power supply batteries for various electric devices. The cylindrical battery has a basic structure in which the opening of the bottomed cylindrical battery can containing the power generation element is sealed with a metal sealing plate for sealing the battery can, and an electrode terminal plate is attached. doing. The cylindrical battery is provided with a mechanism for escaping the increased internal pressure to the outside as a safety measure when the internal pressure of the battery is increased due to reverse connection or the like. For example, as illustrated in FIG. 2 in Patent Document 1, in a cylindrical battery, a thin portion 21 such as a V-shaped groove is provided on the surface of a sealing plate 20a made of metal, and the internal pressure in the battery 1a is abnormal. When raised, the thin-walled portion 21 is pre-ruptured to release the internal pressure.

特開２００９−１２３３７５号公報JP, 2009-123375, A

特許文献１の封口板２０ａでは、薄肉部２１が形成されている表面と薄肉部２１が形成されている表面と対向する表面とは、封口板２１の全体にわたって同一平面を形成している。すなわち、薄肉部２１は、平板状の封口板２０ａの一方の面に刻設されている。しかし、このような構成の封口板２０ａでは、電池内圧の上昇に対して薄肉部２１が破断する圧力にばらつきが生じることが観察された。電池内圧の上昇に対して薄肉部２１がなかなか破断せず電池内圧が極度に上昇した状態で薄肉部２１が破断した場合には、電池内圧が一気に開放されるとともに電解液等の電池内容物が放出されてしまうという問題点があった。   In the sealing plate 20 a of Patent Document 1, the surface on which the thin portion 21 is formed and the surface facing the surface on which the thin portion 21 is formed form the same plane over the entire sealing plate 21. That is, the thin portion 21 is engraved on one surface of the flat sealing plate 20a. However, in the sealing plate 20a having such a configuration, it was observed that variation occurs in the pressure at which the thin portion 21 breaks due to the increase in the battery internal pressure. When the thin portion 21 does not break easily due to the rise of the internal pressure of the battery and the thin portion 21 breaks at a state where the internal pressure of the battery rises extremely, the internal pressure of the battery is released at once and the contents of the battery such as electrolyte There was a problem that it was released.

本発明は、上記のような問題点を解決するためになされたもので、電池内圧の上昇に対して安定して内圧開放動作を行う筒型電池の封口板及び筒型電池を提供することを一つの目的としている。   The present invention has been made to solve the above-mentioned problems, and to provide a cylindrical battery sealing plate and a cylindrical battery capable of performing the internal pressure releasing operation stably against the rise of the battery internal pressure. It is one purpose.

前記の、及び他の問題点を解決するために、本発明の一つの態様は、有底筒状の電池缶と、当該電池缶の内側に配置されている発電要素と、前記発電要素と電気的に接続されている電極端子とを有する筒型電池を構成すべく、前記電池缶の開口部を封止するための封口板であって、前記封口板は前記電池缶の内周部と封止状態に接続される外周部と、前記電極端子の周縁部を封止するための内周部とを有する平板状に形成されており、前記封口板の前記外周部と前記内周部との間には、当該封口板の周方向に沿って所定の幅でもって、他の前記封口板の部分の厚みよりも厚みが薄く形成されている帯状の領域である薄肉部が形成されており、前記封口板の前記薄肉部より内周側部分が、前記封口板の前記薄肉部の外周側よりも前記電池缶の底方向に偏位されていることを特徴とする筒型電池の封口板である。   In order to solve the above-mentioned and other problems, one aspect of the present invention is a bottomed cylindrical battery can, a power generation element disposed inside the battery can, the power generation element and electricity. A sealing plate for sealing the opening of the battery can, in order to form a cylindrical battery having electrode terminals connected in series, the sealing plate being sealed with the inner circumferential portion of the battery can It is formed in the shape of a flat plate having an outer peripheral part connected in a closed state and an inner peripheral part for sealing the peripheral part of the electrode terminal, and the outer peripheral part and the inner peripheral part of the sealing plate Between them, a thin-walled portion is formed, which is a band-like region formed with a predetermined width along the circumferential direction of the sealing plate and a thickness smaller than the thickness of the other sealing plate portions, The inner peripheral side portion of the sealing plate with respect to the thin-walled portion is the bottom of the battery can than the outer peripheral side of the thin-walled portion of the sealing plate That it is displaced in direction a sealing plate of the cylindrical battery according to claim.

また、本発明の他の態様は、有底筒状の電池缶と、当該電池缶の内側に配置されている発電要素と、前記発電要素と電気的に接続されている電極端子と、前記電池缶の開口部を封止するための封口板とを有する筒型電池であって、前記封口板は前記電池缶の内周部と封止状態に接続される外周部と、前記電極端子の周縁部を封止するための内周部とを有する平板状に形成されており、前記封口板の前記外周部と前記内周部との間には、当該封口板の周方向に沿って所定の幅でもって、他の前記封口板の部分の厚みよりも厚みが薄く形成されている帯状の領域である薄肉部が形成されており、前記封口板の前記薄肉部より内周側部分が、前記封口板の前記薄肉部の外周側よりも前記電池缶の底方向に偏位されていることを特徴とする筒型電池である。   Moreover, the other aspect of this invention is a bottomed cylindrical battery can, the electric power generation element arrange | positioned inside the said battery can, the electrode terminal electrically connected with the said electric power generation element, The said battery A cylindrical battery having a sealing plate for sealing an opening of the can, wherein the sealing plate is an outer peripheral portion connected to an inner peripheral portion of the battery can and a sealing state, and a peripheral edge of the electrode terminal The sealing plate is formed in a flat plate shape having an inner circumferential portion for sealing the portion, and between the outer circumferential portion and the inner circumferential portion of the sealing plate, a predetermined shape is provided along the circumferential direction of the sealing plate. A thin portion which is a band-like region formed so as to be thinner than the other portions of the sealing plate by a width is formed, and an inner peripheral side portion from the thin portion of the sealing plate is the The cylindrical battery is characterized in that it is offset in the bottom direction of the battery can from the outer peripheral side of the thin portion of the sealing plate. That.

本発明の一態様によれば、電池内圧の上昇に対して安定して内圧開放動作を行う筒型電池の封口板及び筒型電池を提供することができる。   According to one aspect of the present invention, it is possible to provide a cylindrical battery sealing plate and a cylindrical battery that perform the internal pressure release operation stably with respect to a rise in the battery internal pressure.

図１は、本発明の一実施形態に係る筒型電池１の構成を例示する縦断面図である。FIG. 1 is a longitudinal cross-sectional view illustrating the configuration of a cylindrical battery 1 according to an embodiment of the present invention. 図２は、図１の筒型電池１に設けられる封口板３０の模式平面図である。FIG. 2 is a schematic plan view of the sealing plate 30 provided in the cylindrical battery 1 of FIG. 図３は、図１の筒型電池１に設けられる薄肉部３２周辺部の構成を例示する縦断面図である。FIG. 3 is a longitudinal sectional view illustrating the configuration of the peripheral portion of the thin portion 32 provided in the cylindrical battery 1 of FIG. 図４は、本実施形態の封口体３０の薄肉部３２の破断シミュレーション用モデルを示す模式図である。FIG. 4: is a schematic diagram which shows the model for fracture simulation of the thin part 32 of the sealing body 30 of this embodiment. 図５は、各シミュレーションモデルについての発生応力と薄肉部３２の変位との関係を例示するグラフである。FIG. 5 is a graph illustrating the relationship between the generated stress and the displacement of the thin portion 32 for each simulation model. 図６は、本実施形態と従来例について封口体３０の薄肉部３２による破断応力のばらつきを示すヒストグラムである。FIG. 6 is a histogram showing variation in breaking stress due to the thin portion 32 of the sealing body 30 in the present embodiment and the conventional example.

以下に、添付図面を参照して、本発明の実施形態について具体的に説明する。なお、本発明は、それらの実施形態に限定されるものではない。   Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The present invention is not limited to these embodiments.

まず、図１に、本実施形態に係る筒型電池１の構成例を示す縦断面図を示している。図１の筒型電池１は、有底筒型の電池缶１０の内部に発電要素２０を収容して構成されている。筒型の形状は、円筒形であっても他の角筒形であってもよい。発電要素２０としては、正極合剤と負極合剤とをセパレータを介してスパイラル状に形成してリチウム一次電池を構成した例として示しているが、アルカリ電池などの他の形式の電池にも適用することができる。   First, FIG. 1 shows a longitudinal sectional view showing a configuration example of a cylindrical battery 1 according to the present embodiment. The cylindrical battery 1 of FIG. 1 is configured by housing a power generation element 20 inside a bottomed cylindrical battery can 10. The cylindrical shape may be cylindrical or any other rectangular shape. Although the positive electrode mixture and the negative electrode mixture are spirally formed via the separator as the power generation element 20 as an example of forming a lithium primary battery, the power generation element 20 is also applied to other types of batteries such as alkaline batteries. can do.

図１に示されるように、電池缶１０は略平板状の封口板３０の周縁折り曲げ部３０ａを電池缶１０の内周に沿って溶接することにより封止されている。封口板３０の中央開口部には、この封口板３０と一体的に設けられる合成樹脂でなる絶縁ガスケット３６を有する。絶縁ガスケット３６の中央に設けられた開口部には正極端子４０が挿通されており、その電池缶１０内に突出する一端部には集電リード５０がその一端部において固接されて発電要素２０の正極材料と接続している。正極端子４０の一端部にはワッシャ３４がはめ込まれ、正極端子４０の端部を軸方向に押圧変形させることにより、封口板３０と絶縁ガスケット３６とをかしめつけている。なお、封口板３０による電池缶１０の封止構造としては、上記の溶接による構成に限定されることなく、封口板３０の外周と電池缶１０とを封止状態に接続するための種々の構成が含まれる。   As shown in FIG. 1, the battery can 10 is sealed by welding the peripheral bent portions 30 a of the substantially flat plate-like sealing plate 30 along the inner periphery of the battery can 10. At the central opening of the sealing plate 30, an insulating gasket 36 made of a synthetic resin provided integrally with the sealing plate 30 is provided. The positive electrode terminal 40 is inserted through the opening provided at the center of the insulating gasket 36, and the current collection lead 50 is fixedly connected at one end to the one end protruding into the battery can 10, thereby the power generating element 20. Connected to the positive electrode material of A washer 34 is fitted into one end of the positive electrode terminal 40, and the sealing plate 30 and the insulating gasket 36 are crimped by pressing and deforming the end of the positive electrode terminal 40 in the axial direction. The sealing structure of the battery can 10 by the sealing plate 30 is not limited to the above configuration by welding, and various configurations for connecting the outer periphery of the sealing plate 30 and the battery can 10 in a sealed state Is included.

封口板３０には、その折り曲げ部３０ａ及び絶縁ガスケット３６のいずれとも重複しない範囲で、封口板３０を周回するように設けられた薄肉部３２を有する。薄肉部３２の外周側と薄肉部３２の内周側とでは、電池缶１０の軸方向における封口板３０の位置が異なる。すなわち、封口板３０には、その半径方向で見て、薄肉部３２の外周側と内周側とで段差が設けられている。図２に封口板３０を電池缶１０の開口端側から見た平面図を、図３に封口板３０の薄肉部３２周辺の構成を部分断面図として示している。   The sealing plate 30 has a thin portion 32 provided so as to go around the sealing plate 30 within a range not overlapping with any of the bent portion 30 a and the insulating gasket 36. The position of the sealing plate 30 in the axial direction of the battery can 10 is different between the outer peripheral side of the thin portion 32 and the inner peripheral side of the thin portion 32. That is, the sealing plate 30 is provided with a step on the outer peripheral side and the inner peripheral side of the thin portion 32 as viewed in the radial direction. The top view which looked at the sealing board 30 from the opening end side of the battery can 10 in FIG. 2 is shown as a fragmentary sectional view about the structure of thin-walled part 32 periphery of the sealing board 30 in FIG.

封口板３０の薄肉部３２は、封口板３０の素材となる金属板（例えばステンレス板）をプレス加工することによって形成することができる。封口板３０の薄肉部３２の形状は、薄肉部３２を挟んだ封口板３０の段差Ｈ、薄肉部３２の厚みＴ、薄肉部３２の封口板３０半径方向の幅Ｗによって規定され、その形状によって電池内圧上昇時に圧力を逃がす作用を行う排出弁としての性能が変化する。本出願人は、この封口板３０の薄肉部３２の形状を種々変更した場合の排出弁としての性能を確認するためのシミュレーションモデルを制作し、当該シミュレーションモデルを用いて本実施形態による封口板３０の薄肉部３２の効果を確認した。以下にそのシミュレーションモデルとシミュレーション結果について説明する。   The thin portion 32 of the sealing plate 30 can be formed by pressing a metal plate (for example, a stainless steel plate) which is a material of the sealing plate 30. The shape of the thin portion 32 of the sealing plate 30 is defined by the step H of the sealing plate 30 sandwiching the thin portion 32, the thickness T of the thin portion 32, and the width W in the radial direction of the sealing plate 30 of the thin portion 32 When the battery internal pressure rises, the performance as a discharge valve for releasing the pressure changes. The applicant has produced a simulation model for confirming the performance as a discharge valve when variously changing the shape of the thin portion 32 of the sealing plate 30, and using the simulation model, the sealing plate 30 according to the present embodiment. The effect of the thin-walled portion 32 was confirmed. The simulation model and the simulation results will be described below.

図４に、本実施形態に関する封口板３０の薄肉部３２の破断シミュレーションのために制作したシミュレーションモデルを示している。シミュレーションモデルは、従来モデル、本願モデル１、本願モデル２の３種類とし、封口板３０の薄肉部３２を半径方向に切断して得られる二次元モデルとしている。封口板３０の素材としては、ステンレス材のＳＵＳ４３０を非線形材として想定した。従来モデルは封口板３０に段差Ｈがなく、幅Ｗ、厚みＴの薄肉部３２が設けられているのみである。薄肉部３２を形成するための溝は、電池１の内方側（電池内圧が印加される側）の表面に設けている。これは、電池内圧上昇時に、電池内圧が薄肉部３２に形成される凹溝部に集中して安定した破断効果が得られるようにするためである。本願モデル１は、封口板３０に薄肉部３２を挟んで段差Ｈ＝０．１ｍｍを設けている。本願モデル２は、封口板３０に薄肉部３２を挟んで段差Ｈ＝０．２ｍｍを設けている。段差Ｈは、封口板３０の外周側が内周側よりも電池１の正極端子４０よりとなるように設定されている。すなわち封口板３０は正極端子４０側から見て略凹状となっている。   FIG. 4 shows a simulation model created for the fracture simulation of the thin portion 32 of the sealing plate 30 according to the present embodiment. The simulation model is a conventional model, the present application model 1, and the present application model 2, and is a two-dimensional model obtained by cutting the thin-walled portion 32 of the sealing plate 30 in the radial direction. As a material of the sealing plate 30, stainless steel SUS430 was assumed as a non-linear material. In the conventional model, the sealing plate 30 has no step H, and only a thin portion 32 having a width W and a thickness T is provided. The groove for forming the thin portion 32 is provided on the surface of the battery 1 on the inner side (the side to which the battery internal pressure is applied). This is for the battery internal pressure to be concentrated in the recessed groove portion formed in the thin portion 32 when the battery internal pressure rises, and to obtain a stable breaking effect. In the present application model 1, the sealing plate 30 is provided with a step H = 0.1 mm with the thin portion 32 interposed therebetween. In the present application model 2, the sealing plate 30 is provided with a step H = 0.2 mm across the thin portion 32. The level difference H is set so that the outer peripheral side of the sealing plate 30 is closer to the positive electrode terminal 40 of the battery 1 than the inner peripheral side. That is, the sealing plate 30 is substantially concave when viewed from the positive electrode terminal 40 side.

まず、本実施形態の薄肉部３２を設けた封口板３０の内圧上昇時の挙動に与える効果を確認するシミュレーションを実施した。前記３つのモデルについて、薄肉部３２の厚みＴ＝０．３ｍｍ、幅Ｗ＝１．０ｍｍと設定した。これらのシミュレーションモデルについて、封口板３０の薄肉部３２の内方側の部分が電池１の軸方向に電池缶１０外方へ向けて０．２ｍｍ変位したときに薄肉部３２に発生する応力を算出した。この想定は、電池１の内圧上昇により、封口板３０の薄肉部３２内方部分が０．２ｍｍ押し出された状態を意味している。   First, a simulation was performed to confirm the effect on the behavior of the sealing plate 30 provided with the thin-walled portion 32 of the present embodiment when the internal pressure is increased. The thickness T of the thin portion 32 was set to 0.3 mm and the width W was set to 1.0 mm for the three models. In these simulation models, the stress generated in the thin portion 32 when the inward portion of the thin portion 32 of the sealing plate 30 is displaced 0.2 mm in the axial direction of the battery 1 outward of the battery can 10 is calculated. did. This assumption means that the inward portion of the thin portion 32 of the sealing plate 30 is pushed out by 0.2 mm due to the increase in internal pressure of the battery 1.

各シミュレーションモデルについて薄肉部３２内方側の変位（ｍｍ）に対する薄肉部３２での発生応力（ＧＰａ）を算出した。電池内圧を安全に開放することができるために薄肉部３２に発生する応力として、０．５ＧＰａを想定した。図５のグラフに、各シミュレーションモデルについての発生応力と薄肉部３２の変位との関係を例示している。図５に示されているように、薄肉部３２が破断して排出弁として機能する０．５ＧＰａに応力が到達する際の変位は、
従来モデル ０．１２ｍｍ
本願モデル１ ０．０５ｍｍ
本願モデル２ ０．１３ｍｍ
となった。このことから、従来モデル、本願モデル２と比較して、本願モデル１では約１／３程度の変位量で薄肉部３２が破断し、確実に電池内圧を開放可能であることが確認された。 The generated stress (GPa) in the thin portion 32 with respect to the displacement (mm) on the inward side of the thin portion 32 was calculated for each simulation model. In order to be able to release the battery internal pressure safely, 0.5 GPa was assumed as stress generated in the thin portion 32. The graph of FIG. 5 illustrates the relationship between the generated stress and the displacement of the thin portion 32 for each simulation model. As shown in FIG. 5, the displacement when the thin portion 32 breaks and the stress reaches 0.5 GPa functioning as a discharge valve is
Conventional model 0.12 mm
The present application model 1 0.05 mm
This application model 2 0.13 mm
It became. From this, it is confirmed that the thin portion 32 is broken at a displacement amount of about 1/3 in the present model 1 compared to the conventional model and the present application model 2, and the battery internal pressure can be reliably released.

本願モデル１では、電池内圧の上昇により封口板３０が膨張する過程で、薄肉部３２に作用する応力が圧縮から引張へと変化する。このため、発生応力が排出弁作動の閾値として設定した０．５ＧＰａに達するまでに薄肉部３２に圧縮・引張による金属疲労が生じ、破断しやすくなっていると考えられる。一方、本願モデル２では、電池内圧の上昇により膨張する過程で、本願モデル１よりも段差Ｈが大きく、その結果薄肉部３２の長さも長くなっているので、その薄肉部３２が複雑に変形することとなり、従来モデルと大差ない結果となったと考えられる。本願モデル２は、薄肉部３２が比較的長いため、その変形を適切に制御することは難しいと考えられる。以上のことから、本願発明を適切に実施するためには本願モデル１がより好適と考えられたので、以下、従来モデルと本願モデル１とを用いて他のシミュレーションを実施した。なお、以下の各シミュレーションにおいても前記した図５と同様の発生圧力と薄肉部３２の変位との関係を得たが、個々のグラフの記載は省略して読み取った数値を各表に記載した。   In the present application model 1, the stress acting on the thin-walled portion 32 changes from compression to tension in the process of expansion of the sealing plate 30 due to the increase of the battery internal pressure. For this reason, it is considered that metal fatigue due to compression and tension occurs in the thin portion 32 by the time the generated stress reaches 0.5 GPa set as the threshold value of the discharge valve operation, and it is easy to break. On the other hand, in the present application model 2, the step H is larger than that of the present application model 1 in the process of expansion due to the increase of the battery internal pressure, and as a result, the length of the thin portion 32 is longer. It is considered that the result is not much different from the conventional model. Since the thin-walled portion 32 of the present application model 2 is relatively long, it is considered difficult to appropriately control its deformation. From the above, the model 1 of the present application was considered to be more preferable in order to appropriately implement the present invention. Therefore, another simulation was performed using the conventional model and the model of the present application 1 hereinafter. In each of the following simulations, although the relationship between the generated pressure and the displacement of the thin portion 32 similar to that of FIG. 5 described above was obtained, the description of each graph was omitted and the read numerical values were described in each table.

薄肉部３２の厚みに関するシミュレーション
まず、封口板３０に設ける薄肉部３２の厚みと、薄肉部３２に発生する応力との関係を、前記シミュレーションモデルにより算出した。シミュレーションモデルは、従来モデル（段差なし）と本願モデル１（段差Ｈ＝０．１ｍｍ）であり、薄肉部３２の幅Ｗは１．０ｍｍとした。各モデルについて、薄肉部３２に発生する応力が、排出弁として作動する閾値と想定している０．５ＧＰａに達するときの薄肉部３２の変位（封口板３０で、薄肉部３２の内方側部分が外方側部分に対して電池１の軸方向に移動した距離）を求めた。表１に、薄肉部３２の厚みをパラメータとして、各モデルについて算出された変位を示している。なお、薄肉部３２の厚みは、四捨五入して小数点以下２桁に丸めたものである。 Simulation on the Thickness of the Thin-Walled Part 32 First, the relationship between the thickness of the thin-walled part 32 provided on the sealing plate 30 and the stress generated in the thin-walled part 32 was calculated by the simulation model. The simulation model is the conventional model (no level difference) and the present application model 1 (level difference H = 0.1 mm), and the width W of the thin portion 32 is 1.0 mm. For each model, the displacement of the thin-walled portion 32 when the stress generated in the thin-walled portion 32 reaches 0.5 GPa assumed to be the threshold acting as a discharge valve (in the inner side portion of the thin-walled portion 32 in the sealing plate 30) The distance traveled in the axial direction of the battery 1 with respect to the outer side portion was determined. Table 1 shows the displacement calculated for each model, using the thickness of the thin portion 32 as a parameter. The thickness of the thin portion 32 is rounded to two decimal places.

Figure 0006523722
Figure 0006523722

表１に示すように、従来モデルでは、薄肉部３２の厚みを０．０２、０．０３、０．０４ｍｍと変更した場合、いずれの厚みについても応力が閾値に達するには０．１ｍｍ以上変位している。一方、本願モデル１では、薄肉部３２の厚みが０．０４ｍｍと厚い場合に変位が０．２ｍｍを超えているが、薄肉部３２の厚みが０．０２、０．０３ｍｍの場合にはそれぞれ０．０６、０．０４ｍｍ程度の小さな変位で排出弁作動閾値に達している。これらの場合には、電池内圧が上昇した場合、わずかな変位で安全に内圧を開放することができることを意味している。薄肉部３２の厚みが小さいほど、圧縮力、引張力いずれについても薄肉部３２に発生する応力は大きくなる傾向があるため、小さな変位で作動するようになる。ただし、薄肉部３２の厚みを小さくしすぎると、薄肉部３２の強度低下により、電池１に衝撃が与えられた場合などに薄肉部３２が損傷するおそれがあるので、薄肉部３２の厚みは上記シミュレーション結果と耐久性とのバランスで決定すればよい。   As shown in Table 1, in the conventional model, when the thickness of the thin-walled part 32 is changed to 0.02, 0.03, 0.04 mm, the displacement reaches 0.1 mm or more for the stress to reach the threshold for any thickness. doing. On the other hand, in the present application model 1, the displacement exceeds 0.2 mm when the thickness of the thin portion 32 is as thick as 0.04 mm, but 0 when the thickness of the thin portion 32 is 0.02 and 0.03 mm. The discharge valve operation threshold is reached with a small displacement of about .06 mm. In these cases, when the battery internal pressure rises, it means that the internal pressure can be safely released with a slight displacement. As the thickness of the thin portion 32 is smaller, the stress generated in the thin portion 32 tends to increase with respect to either the compressive force or the tensile force, so that it operates with a small displacement. However, if the thickness of the thin portion 32 is too small, there is a possibility that the thin portion 32 may be damaged when an impact is given to the battery 1 due to the strength reduction of the thin portion 32. It may be determined by the balance between simulation results and durability.

薄肉部３２の幅に関するシミュレーション
次に、封口板３０に設ける薄肉部３２の幅と、薄肉部３２に発生する応力との関係を、前記シミュレーションモデルにより算出した。シミュレーションモデルは、従来モデル（段差なし）と本願モデル１（段差Ｈ＝０．１ｍｍ）であり、薄肉部３２の厚みＴは０．０３ｍｍとした。各モデルについて、薄肉部３２に発生する応力が、排出弁として作動する閾値と想定している０．５ＧＰａに達するときの薄肉部３２の変位を求めた。表２に、薄肉部３２の幅をパラメータとして、各モデルについて算出された変位を示している。なお、薄肉部３２の幅は、四捨五入して小数点以下２桁に丸めたものである。 Next, the relationship between the width of the thin portion 32 provided on the sealing plate 30 and the stress generated in the thin portion 32 was calculated using the simulation model. The simulation model is the conventional model (no level difference) and the present application model 1 (level difference H = 0.1 mm), and the thickness T of the thin portion 32 is 0.03 mm. For each model, the displacement of the thin-walled portion 32 was determined when the stress generated in the thin-walled portion 32 reached 0.5 GPa, which is assumed to be the threshold value acting as the discharge valve. Table 2 shows the displacement calculated for each model using the width of the thin portion 32 as a parameter. The width of the thin portion 32 is rounded to two decimal places.

Figure 0006523722
Figure 0006523722

表２に示すように、従来モデルでは、薄肉部３２の幅を０．７５、１．００、１．２５ｍｍと変更した場合、いずれの幅についても応力が閾値に達するには０．１ｍｍ以上変位していることがわかる。一方、本願モデル１では、薄肉部３２の幅が１．２５ｍｍと大きい場合に変位が０．２ｍｍを超えているが、薄肉部３２の幅が０．７５、１．０ｍｍの場合にはそれぞれ０．０３、０．０５ｍｍ程度の小さな変位で排出弁作動閾値に達している。これらの場合には、電池内圧が上昇した場合、わずかな変位で安全に内圧を開放することができることを意味している。   As shown in Table 2, in the conventional model, when the width of the thin-walled portion 32 is changed to 0.75, 1.00, and 1.25 mm, the displacement reaches 0.1 mm or more for the stress to reach the threshold for any width. You can see that On the other hand, in the present application model 1, the displacement exceeds 0.2 mm when the width of the thin portion 32 is as large as 1.25 mm, but 0 when the width of the thin portion 32 is 0.75 and 1.0 mm. The discharge valve operation threshold is reached with a small displacement of about .03 mm. In these cases, when the battery internal pressure rises, it means that the internal pressure can be safely released with a slight displacement.

薄肉部３２の段差に関するシミュレーション
次に、封口板３０に設ける薄肉部３２の段差と、薄肉部３２に発生する応力との関係を、前記シミュレーションモデルにより算出した。シミュレーションモデルは、薄肉部３２の幅Ｗ＝１．０ｍｍ、厚みＴ＝０．０３ｍｍとし、段差Ｈを０（従来モデルの段差なし）から本願モデル１（段差Ｈ＝０．１ｍｍ）を含み０．２ｍｍまで変化させ、薄肉部３２に発生する応力が、排出弁として作動する閾値と想定している０．５ＧＰａに達するときの薄肉部３２の変位を求めた。なお、薄肉部３２の段差は、四捨五入して小数点以下２桁に丸めたものである。表３に、薄肉部３２の段差をパラメータとして算出された変位を示している。表３で段差Ｈのマイナス記号は、封口板３０の薄肉部３２を挟んだ内方側が外方側よりも低くなっている（封口板３０を正極端子側から見たときに略凹状となっている）ことを示している。なお、逆に薄肉部３２の外方側を内方側よりも０．１ｍｍ低くしたモデルについて変位を算出したが、薄肉部３２での発生応力が高まる（従来モデルよりも小さい変位で閾値応力に達する）効果は見られなかった。 Next, the relationship between the step of the thin portion 32 provided on the sealing plate 30 and the stress generated in the thin portion 32 was calculated by the simulation model. The simulation model has a width W = 1.0 mm and a thickness T = 0.03 mm of the thin-walled part 32, and the step H is from 0 (no step of the conventional model) to the present application model 1 (step H = 0.1 mm). The displacement was changed to 2 mm, and the displacement of the thin-walled portion 32 when the stress generated in the thin-walled portion 32 reached 0.5 GPa assumed to be a threshold operating as a discharge valve was determined. In addition, the level | step difference of the thin part 32 is rounded off and rounded off to two decimal places. Table 3 shows the displacement calculated using the step of the thin portion 32 as a parameter. The minus sign of the step H in Table 3 is lower at the inner side of the thin plate 32 of the sealing plate 30 than at the outer side (when the sealing plate 30 is viewed from the positive electrode terminal side, it is substantially concave) Show that). Although the displacement was calculated for a model in which the outer side of the thin portion 32 was 0.1 mm lower than the inner side, the generated stress in the thin portion 32 increased (the threshold stress was smaller than the conventional model). The effect was not seen.

Figure 0006523722
Figure 0006523722

表３に示すように、薄肉部３２の幅と厚みを前記のように一定として段差Ｈを変化させた場合、Ｈ＝−０．１０ｍｍ近辺では０．０５ｍｍと比較的小さい変位で閾値応力に達しており、電池１の内圧上昇に対して小さい変位で、すなわち小さな内圧上昇で薄肉部３２が破断して内圧を開放可能と期待できることがわかる。   As shown in Table 3, when the step H is changed with the width and thickness of the thin portion 32 fixed as described above, the threshold stress is reached with a relatively small displacement of 0.05 mm around H = −0.10 mm. It can be seen that the thin portion 32 is broken with a small displacement relative to the rise in the internal pressure of the battery 1, that is, it can be expected that the internal pressure can be released.

上記のほか、封口板３０の材質を変更したシミュレーションも実施した。シミュレーションモデルは、薄肉部３２の段差Ｈ＝０．１０ｍｍ、幅Ｗ＝１．００ｍｍ、厚みＴ＝０．０３ｍｍとし、材質は、ステンレス材のＳＵＳ３１６、ＳＵＳ４３０を想定した。これらの場合、材質により変位に対する発生応力の挙動、大きさに差異は見られたが、いずれも変位が０．０５ｍｍ以下で閾値応力に達する効果が見られた。   In addition to the above, a simulation was also performed in which the material of the sealing plate 30 was changed. In the simulation model, the difference in height H of the thin portion 32 was 0.10 mm, the width W was 1.00 mm, and the thickness T was 0.03 mm, and the materials were stainless steels SUS316 and SUS430. In these cases, the behavior and magnitude of the generated stress with respect to displacement were different depending on the material, but in any case, the effect of reaching the threshold stress was observed when the displacement was 0.05 mm or less.

以上のように、封口板３０の本実施形態の薄肉部３２を設けた場合の効果が明らかとなったが、ここで、本実施形態の封口板３０を設けた電池缶１０を用いて、実際に電池内圧を上昇させたとした場合の作動圧（薄肉部３２が排出弁として動作するときの圧力）を測定した。電池１として円筒型電池を想定し、以下の手順で測定を行った。測定対象としては、シミュレーションにおける従来モデルと本願モデル１とし、薄肉部３２の幅Ｗ＝１．０ｍｍ、厚みＴ＝０．０３ｍｍとした。   As mentioned above, although the effect at the time of providing thin part 32 of this embodiment of sealing board 30 became clear, here, using battery can 10 which provided sealing board 30 of this embodiment, actually The operating pressure (pressure when the thin portion 32 operates as a discharge valve) when the battery internal pressure was raised was measured. Assuming that a cylindrical battery was used as the battery 1, measurement was performed according to the following procedure. The measurement target was the conventional model in the simulation and the present application model 1, and the width W of the thin portion 32 was 1.0 mm, and the thickness T was 0.03 mm.

まず、封口板３０を溶接して密封した電池缶１０を作動圧試験機に取り付け、作動圧試験機から純水が封口板付きの外装缶に自動供給されるように設定した。そして、電池缶１０内に純水が貯留されて内圧が上昇し、封口板３０の薄肉部３２が破断した時の圧力を測定した。測定結果を図６に示している。   First, the battery can 10 in which the sealing plate 30 was welded and sealed was attached to the working pressure tester, and it was set so that pure water was automatically supplied from the working pressure tester to the outer can with the sealing plate. Then, pure water was stored in the battery can 10, the internal pressure increased, and the pressure when the thin portion 32 of the sealing plate 30 was broken was measured. The measurement results are shown in FIG.

図６は、従来モデル、本願モデル１各１０個のサンプルについて、上記の作動圧を測定した結果を示している。図示のヒストグラムの縦軸は作動圧を、横軸は対応するサンプル数を示している。図６の結果から明らかなように、本発明を適用した本願モデル１によるサンプル電池では、従来モデルと比較して作動圧のばらつきが抑制されており、安定した弁差動が可能となっている。   FIG. 6 shows the results of measuring the above-mentioned operating pressure for each of ten samples of the conventional model and the present model 1. The vertical axis of the illustrated histogram indicates the operating pressure, and the horizontal axis indicates the corresponding number of samples. As apparent from the results of FIG. 6, in the sample battery according to the present application model 1 to which the present invention is applied, the variation in operating pressure is suppressed as compared with the conventional model, and stable valve differential is possible. .

以上詳細に説明したように、本発明の実施形態に係る、薄肉部３２を有する封口板３０を備えた筒型電池では、なんらかの原因で電池内圧が上昇した場合、電池内圧が比較的低い段階で薄肉部３２が破断して電池内圧を外部に開放することができる。したがって、電池が破裂して内容物が噴出するような状況を防止することができる。また、薄肉部３２が破断する際の圧力にばらつきが少ないため、電池内圧を安全に開放する効果を確実に得ることができる。   As described above in detail, in the cylindrical battery provided with the sealing plate 30 having the thin portion 32 according to the embodiment of the present invention, when the battery internal pressure rises for some reason, the battery internal pressure is relatively low. The thin portion 32 can be broken to release the battery internal pressure to the outside. Therefore, it is possible to prevent a situation where the battery is ruptured and the contents are spouted. In addition, since the variation in pressure at the time of breakage of the thin portion 32 is small, the effect of safely releasing the battery internal pressure can be reliably obtained.

１ 筒型電池 １０ 電池缶 ２０ 発電要素
３０ 封口板 ３２ 薄肉部
1 cylindrical battery 10 battery can 20 power generation element 30 sealing plate 32 thin-walled portion

Claims (3)

有底筒状の電池缶と、当該電池缶の内側に配置されている発電要素と、前記発電要素と電気的に接続されている電極端子とを有する筒型電池を構成すべく、前記電池缶の開口部を封止するための封口板であって、
前記封口板は前記電池缶の内周部と封止状態に接続される外周部と、前記電極端子の周縁部を封止するための内周部とを有する平板状に形成されており、
前記封口板の前記外周部と前記内周部との間には、当該封口板の周方向に沿って所定の幅でもって、他の前記封口板の部分の厚みよりも厚みが薄く形成されている帯状の領域である薄肉部が形成されており、前記封口板の前記薄肉部より内周側部分が、前記封口板の前記薄肉部の外周側よりも前記電池缶の底方向に偏位されている、
ことを特徴とする筒型電池の封口板。 The battery can comprises a cylindrical battery having a bottomed cylindrical battery can, a power generating element disposed inside the battery can, and an electrode terminal electrically connected to the power generating element. A sealing plate for sealing the opening of the
The sealing plate is formed in a flat plate shape having an inner peripheral portion connected to the inner peripheral portion of the battery can and a sealing state, and an inner peripheral portion for sealing the peripheral portion of the electrode terminal.
Between the outer peripheral portion and the inner peripheral portion of the sealing plate, the thickness is formed thinner than the thickness of the other sealing plate with a predetermined width along the circumferential direction of the sealing plate A thin portion which is a band-like region is formed, and the inner peripheral side portion from the thin portion of the sealing plate is offset in the bottom direction of the battery can than the outer peripheral side of the thin portion of the sealing plate ing,
A sealing plate of a cylindrical battery characterized in that. 請求項１に記載の筒型電池の封口板であって、
前記薄肉部は、前記封口板の前記電池缶内部の側から設けられた前記幅の溝として形成されていることを特徴とする筒型電池の封口板。 It is a sealing plate of the cylindrical battery of Claim 1, Comprising:
The sealing plate of a cylindrical battery, wherein the thin-walled portion is formed as a groove of the width provided from the inside of the battery can of the sealing plate. 有底筒状の電池缶と、当該電池缶の内側に配置されている発電要素と、前記発電要素と電気的に接続されている電極端子と、前記電池缶の開口部を封止するための封口板とを有する筒型電池であって、
前記封口板は前記電池缶の内周部と封止状態に接続される外周部と、前記電極端子の周縁部を封止するための内周部とを有する平板状に形成されており、
前記封口板の前記外周部と前記内周部との間には、当該封口板の周方向に沿って所定の幅でもって、他の前記封口板の部分の厚みよりも厚みが薄く形成されている帯状の領域である薄肉部が形成されており、前記封口板の前記薄肉部より内周側部分が、前記封口板の前記薄肉部の外周側よりも前記電池缶の底方向に偏位されている、
ことを特徴とする筒型電池。
A bottomed cylindrical battery can, a power generation element disposed inside the battery can, an electrode terminal electrically connected to the power generation element, and a seal for the opening of the battery can A cylindrical battery having a sealing plate,
The sealing plate is formed in a flat plate shape having an inner peripheral portion connected to the inner peripheral portion of the battery can and a sealing state, and an inner peripheral portion for sealing the peripheral portion of the electrode terminal.
Between the outer peripheral portion and the inner peripheral portion of the sealing plate, the thickness is formed thinner than the thickness of the other sealing plate with a predetermined width along the circumferential direction of the sealing plate A thin portion which is a band-like region is formed, and the inner peripheral side portion from the thin portion of the sealing plate is offset in the bottom direction of the battery can than the outer peripheral side of the thin portion of the sealing plate ing,
A cylindrical battery characterized by
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US20220029232A1 (en) * 2018-12-28 2022-01-27 Sanyo Electric Co., Ltd. Cylindrical battery
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WO2021199692A1 (en) 2020-04-01 2021-10-07 パナソニックＩｐマネジメント株式会社 Hermetically sealed battery
WO2022158378A1 (en) * 2021-01-21 2022-07-28 三洋電機株式会社 Cylindrical battery
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HU914042D0 (en) * 1991-12-19 1992-04-28 Environmetal Batteries Systems Cylindrical cell with improved current lead
US8486546B2 (en) * 2008-12-01 2013-07-16 Samsung Sdi Co., Ltd. Cap assembly and secondary battery using the same with notched vent member

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