JP5110958B2 - Sealed battery - Google Patents
Sealed battery Download PDFInfo
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- JP5110958B2 JP5110958B2 JP2007125961A JP2007125961A JP5110958B2 JP 5110958 B2 JP5110958 B2 JP 5110958B2 JP 2007125961 A JP2007125961 A JP 2007125961A JP 2007125961 A JP2007125961 A JP 2007125961A JP 5110958 B2 JP5110958 B2 JP 5110958B2
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- rupture disk
- sealed battery
- outer peripheral
- peripheral edge
- hardness
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- 238000007789 sealing Methods 0.000 claims description 42
- 230000002093 peripheral effect Effects 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 238000005482 strain hardening Methods 0.000 claims description 12
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000011255 nonaqueous electrolyte Substances 0.000 description 9
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
- Secondary Cells (AREA)
Description
本発明は、密閉型電池の改良に関し、より詳しくは密閉型電池の密閉性の向上に関する。 The present invention relates to an improvement in a sealed battery, and more particularly to an improvement in the sealing performance of a sealed battery.
非水電解質二次電池は、高いエネルギー密度を有し、高容量であるため、携帯機器の駆動電源として広く利用されている。この非水電解質二次電池には、極めて反応性の高い物質が用いられているため、安全性の確保が重要となる。 Nonaqueous electrolyte secondary batteries have high energy density and high capacity, and are therefore widely used as drive power sources for portable devices. In this non-aqueous electrolyte secondary battery, since a highly reactive substance is used, ensuring safety is important.
非水電解質二次電池の安全性を高めるためには、電池を密閉化するとともに、電池内部で異常が生じた場合には速やかに通電を遮断する等の機構が不可欠である。このため、この種の電池の封口体には、電池内圧が上昇した場合に動作する電流遮断機構が組み込まれている。 In order to improve the safety of the non-aqueous electrolyte secondary battery, a mechanism is required such as sealing the battery and quickly shutting off the current when an abnormality occurs inside the battery. For this reason, a current blocking mechanism that operates when the internal pressure of the battery rises is incorporated in the sealing body of this type of battery.
封口体に関する技術としては、下記特許文献１、２が挙げられる。 The following patent documents 1 and 2 are mentioned as a technique regarding a sealing body.
特許文献１の技術は、封口板が電池缶の外側に面する第１金属板と電池缶の内側に面する第２金属板とを互いに密着させて構成され、第１金属板が第２金属板よりも強度の高い材質によって形成される一方、第２金属板が第１金属板よりも非水電解液に対する耐腐食性の高い材質によって形成され、カシメ部による挟圧力が作用する第２金属板の外周部を、その内側の中央部よりも薄く形成することを特徴とする。この技術によると、封口板を大きな力でカシメ固定したとしても電池出力の低下を招くことのない電池が得られるとされる。 The technology of Patent Document 1 is configured such that a first metal plate whose sealing plate faces the outside of the battery can and a second metal plate that faces the inside of the battery can are in close contact with each other, and the first metal plate is the second metal. The second metal is formed of a material having higher strength than the plate, while the second metal plate is formed of a material having higher corrosion resistance to the non-aqueous electrolyte than the first metal plate, and is subjected to the clamping pressure by the caulking portion. The outer peripheral part of a board is formed thinner than the center part inside. According to this technique, a battery that does not cause a decrease in battery output even if the sealing plate is caulked and fixed with a large force is obtained.
特許文献２の技術は、封口板製造及び封口板を電池に組み込む際に受ける応力による変形を最も受けやすい、電流遮断機構を構成する内端子板、皿状蓋板のどちらか一方、または双方に使用する金属板材に、耐力が２０ｋｇｆ／ｍｍ２以上の金属の両面に異種の金属を配したクラッド板を使用した防爆封口板を用いる技術である。この技術によると、安全性に優れた防爆封口板が得られるとされる。 The technology of Patent Document 2 is the most susceptible to deformation due to the stress received when manufacturing the sealing plate and incorporating the sealing plate into the battery, and either or both of the inner terminal plate and the dish-shaped lid plate constituting the current interruption mechanism. This is a technique that uses an explosion-proof sealing plate that uses a clad plate in which different metals are arranged on both sides of a metal having a yield strength of 20 kgf / mm 2 or more as the metal plate material to be used. According to this technique, an explosion-proof sealing plate excellent in safety is obtained.
しかし、これらの技術には、未だ密閉性が十分ではないという問題が残っている。 However, these technologies still have a problem that the sealing performance is not sufficient.
本発明者らは、電流遮断機構を組み込んだ密閉型電池の密閉性の向上について鋭意研究を行った。従来、電池内部圧力に応じて変形等して電流を遮断するラプチャーディスクについては、変形しやすい硬度の低い材料が用いられており、外力が加わることのある端子キャップには剛性が強い硬度の高い材料が用いられている。このために、カシメ封口の際にカシメ圧力が加わるラプチャーディスクの外周縁部分が伸びて薄くなるため、絶縁ガスケットと封口体との間に隙間ができ、この結果として密閉性が低下することを知った。本発明は、この知見に基づき完成されたものであって、密閉性に優れた密閉型電池を提供することを目的とする。 The inventors of the present invention have intensively studied on improving the sealing property of a sealed battery incorporating a current interruption mechanism. Conventionally, a rupture disk that cuts off the current by deformation or the like according to the internal pressure of the battery has been made of a material with low hardness that is easily deformed, and the terminal cap to which external force is applied has high rigidity and high hardness. Material is used. For this reason, the outer peripheral edge of the rupture disk to which caulking pressure is applied during caulking is stretched and thinned, so that a gap is formed between the insulating gasket and the sealing body, resulting in a decrease in sealing performance. It was. The present invention has been completed based on this finding, and an object of the present invention is to provide a sealed battery having excellent sealing properties.
上記課題を解決するための本発明は次のように構成されている。
有底筒状の外装缶２０の開口部に絶縁ガスケット３０を介して封口体１０をカシメ固定することにより密閉した密閉型電池において、前記封口体１０は、電池外方に突出した突出部６を有する端子キャップ５と、前記端子キャップ５より電池内方に位置し、電極タブを介して電極と電気的に接続された端子板１と、前記端子キャップ５と前記端子板１との間に配置され、周辺部が前記端子キャップ５と通電可能に接続され、前記周辺部以外に設けられた通電接触部７が前記端子板１と通電可能に接続されるとともに、電池内部圧力が上昇したときには前記端子板１との通電が遮断される構造のラプチャーディスク３と、前記端子板１の周辺部と前記ラプチャーディスク３との間に配置された絶縁部材２と、を有し、前記ラプチャーディスク３の外周縁の硬度を中央部の硬度よりも高めたことを特徴とする。
The present invention for solving the above problems is configured as follows.
In a sealed battery that is sealed by caulking and fixing the sealing body 10 to the opening of the bottomed cylindrical outer can 20 via an insulating gasket 30, the sealing body 10 has a protruding portion 6 that protrudes outward from the battery. A terminal cap 5, a terminal plate 1 positioned inward of the battery with respect to the terminal cap 5 and electrically connected to the electrode via an electrode tab, and disposed between the terminal cap 5 and the terminal plate 1. The peripheral portion is connected to the terminal cap 5 so as to be energized, and the energizing contact portion 7 provided other than the peripheral portion is connected to the terminal plate 1 so as to be energizable, and when the battery internal pressure rises, A rupture disk 3 having a structure in which energization with the terminal plate 1 is interrupted; and an insulating member 2 disposed between a peripheral portion of the terminal plate 1 and the rupture disk 3. Wherein the hardness of the outer peripheral edge enhanced than the hardness of the central portion.
この構成では、ラプチャーディスク３の外周縁（３ａ）の硬度を中央部（３ｂ）よりも高く形成してあるので、カシメ封口の際に加わる圧力によってラプチャーディスク（３）の外周縁（３ａ）が変形しにくい。よって、ラプチャーディスク（３）の外周縁（３ａ）の変形に起因する密閉性不良が生じにくい。なお、ラプチャーディスク（３）の外周縁（３ａ）の変形に起因する密閉性不良は、加圧力が作用するラプチャーディスク部分（外周縁３ａ部分）が薄くなり前方に伸びる結果、封口体の先端部分が不揃いになる等して、封口体（１０）と絶縁ガスケット（３０）との間に隙間が生じるためと考えられる。 In this configuration, since the hardness of the outer peripheral edge (3a) of the rupture disk 3 is formed higher than that of the central part (3b), the outer peripheral edge (3a) of the rupture disk (3) is caused by the pressure applied at the time of caulking sealing. Difficult to deform. Therefore, the sealing failure due to the deformation of the outer peripheral edge (3a) of the rupture disk (3) hardly occurs. In addition, the sealing failure due to the deformation of the outer peripheral edge (3a) of the rupture disk (3) is caused by the rupture disk part (outer peripheral edge 3a part) to which the applied pressure is applied becoming thin and extending forward, so that the tip part of the sealing body This is probably because a gap is formed between the sealing body (10) and the insulating gasket (30).
上記構成において、前記ラプチャーディスク（３）は、金属元素組成が同一の単一材料により構成されており、外周縁を加工硬化または焼入れすることにより外周縁の硬度が中央部よりも高められている。 In the above configuration, the rupture disk (3) is made of a single material having the same metal element composition, and the hardness of the outer peripheral edge is higher than that of the central part by work hardening or quenching the outer peripheral edge. .
ラプチャーディスクを複数の材料により作製することにより、外周縁部分（３ａ）の硬度を高めることができるが、この方法は、複雑な工程を必要とし、コスト高になる。これに対し、単一の材料でラプチャーディスク体を形成した上で、このものの外周縁（３ａ）を加工硬化し、または焼入れをする方法により、ラプチャーディスク３の外周縁（３ａ）の硬度を中央部（３ｂ）よりも高めることができる。 Although the hardness of the outer peripheral edge portion (3a) can be increased by making the rupture disk from a plurality of materials, this method requires a complicated process and is expensive. On the other hand, after the rupture disk body is formed of a single material, the outer peripheral edge (3a) of the rupture disk 3 is processed and hardened or quenched, so that the hardness of the outer peripheral edge (3a) of the rupture disk 3 is set to the center It can raise rather than a part (3b).
ここで加工硬化とは、叩きや加圧などにより圧縮力を作用させ硬さを増す加工法をいい、焼き入れとは、金属を高温に加熱した後、これを急冷し、硬さを増す加工法をいう。 Here, work hardening refers to a processing method that increases the hardness by applying a compressive force by striking or pressing, and quenching is a process in which the metal is heated to a high temperature and then rapidly cooled to increase the hardness. Say the law.
上記構成において、ラプチャーディスク３の硬度の高い外周縁３ａを、少なくともカシメ封止の際にカシメ固定力が直接作用する部分を含むものとする。このようにすると、本発明の効果が十分に得られる。 In the above configuration, the outer peripheral edge 3a having a high hardness of the rupture disk 3 includes at least a portion where a caulking fixing force directly acts during caulking sealing. In this way, the effect of the present invention can be sufficiently obtained.
また、上記構成において、前記ラプチャーディスク３の外周縁３ａの厚みを、中央部３ｂの厚みよりも薄くする。なお、加工硬化法によると当該部分の厚みが他の部分よりも薄くなる。 Moreover, in the said structure, the thickness of the outer periphery 3a of the said rupture disk 3 is made thinner than the thickness of the center part 3b. In addition, according to the work hardening method, the thickness of the said part becomes thinner than another part.
この構成によると、充放電反応に寄与しない封口体の体積を小さくすることができるので、電池の体積エネルギー密度を高めることができる。 According to this structure, since the volume of the sealing body which does not contribute to charging / discharging reaction can be made small, the volume energy density of a battery can be raised.
また、上記構成において、前記ラプチャーディスク３の外周縁３ａの硬度は、好ましくは中央部３ｂよりも１０％以上高くする。 Moreover, in the said structure, the hardness of the outer periphery 3a of the said rupture disk 3 is preferably made 10% or more higher than the center part 3b.
この構成によると、ラプチャーディスク３の外周縁３ａの変形を十分に抑制でき、電池の密閉性がより確かになる。なお、１０％という値は、通常の材料が有する不均一さに起因する硬度のバラツキを超える値である。 According to this configuration, the deformation of the outer peripheral edge 3a of the rupture disk 3 can be sufficiently suppressed, and the sealing performance of the battery becomes more reliable. In addition, the value of 10% is a value that exceeds the hardness variation caused by the non-uniformity of a normal material.
また、上記構成において、前記ラプチャーディスク３と、前記端子キャップ５とが、直接又は中間材４を介して溶接されている構成とすることができる。 In the above configuration, the rupture disk 3 and the terminal cap 5 can be welded directly or via an intermediate material 4.
ラプチャーディスク３と、端子キャップ５との固定は、溶接を用いることが好ましいが、ラプチャーディスク３には変形しやすい性質が求められ、他方、端子キャップには強度が求められる。このため、ラプチャーディスク３と、端子キャップ５とを直接溶接することが難しい場合がある。この場合にラプチャーディスク３と端子キャップ５との間に、中間材４を介在させるとよい。 For fixing the rupture disk 3 and the terminal cap 5, it is preferable to use welding, but the rupture disk 3 is required to have a property of being easily deformed, while the terminal cap is required to have strength. For this reason, it may be difficult to directly weld the rupture disk 3 and the terminal cap 5. In this case, the intermediate material 4 may be interposed between the rupture disk 3 and the terminal cap 5.
上記溶接としては、抵抗溶接、超音波溶接、又は高エネルギー線を用いた溶接を採用でき、高エネルギー線としては、レーザ光又は電子ビームを採用することができる。 As the above welding, resistance welding, ultrasonic welding, or welding using a high energy beam can be adopted, and a laser beam or an electron beam can be adopted as the high energy beam.
上記で説明したように、本発明によると、構成部材を新たに附加することなく、密閉性に優れた密閉型電池を生産性よく提供することができる。 As described above, according to the present invention, it is possible to provide a sealed battery excellent in hermeticity with good productivity without adding a new component.
本発明を実施するための最良の形態を、図面を用いて詳細に説明する。なお、本発明は下記の形態に限定されるものではなく、その要旨を変更しない範囲において適宜変更して実施することができる。 The best mode for carrying out the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following form, In the range which does not change the summary, it can change suitably and can implement.
（実施の形態１）
図１は、本実施の形態にかかる密閉型電池に用いる封口体の断面図であり、図２は、本実施の形態にかかる密閉型電池の要部拡大断面図である。
(Embodiment 1)
FIG. 1 is a cross-sectional view of a sealing body used in the sealed battery according to the present embodiment, and FIG. 2 is an enlarged cross-sectional view of a main part of the sealed battery according to the present embodiment.
図１に示すように、封口体１０は、電極タブ８を介して正極または負極と電気的に接続される端子板１と、電池外方に突出した突出部６を有する端子キャップ５と、端子板１と端子キャップ５との間に介在し、電池内部圧力が上昇した際に変形して、端子板１と端子キャップ５との電気的接続を遮断するラプチャーディスク３と、ラプチャーディスク３が電流を遮断する際、ラプチャーディスク３と端子板１との電気的接触を防止する絶縁部材２と、ラプチャーディスク３と端子キャップ５との間に介在する中間材４と、を備えている。 As shown in FIG. 1, the sealing body 10 includes a terminal plate 1 electrically connected to the positive electrode or the negative electrode via the electrode tab 8, a terminal cap 5 having a protruding portion 6 protruding outward from the battery, a terminal The rupture disk 3 is interposed between the plate 1 and the terminal cap 5 and is deformed when the internal pressure of the battery rises, and the electrical connection between the terminal plate 1 and the terminal cap 5 is interrupted. Insulating member 2 that prevents electrical contact between rupture disk 3 and terminal plate 1 and intermediate member 4 interposed between rupture disk 3 and terminal cap 5 are provided.
図２に示すように、外装缶２０の開口部は、絶縁ガスケット３０を介して封口体１０がカシメ固定されて封口されている。 As shown in FIG. 2, the opening of the outer can 20 is sealed with the sealing body 10 being caulked and fixed via an insulating gasket 30.
ラプチャーディスク３の外周縁３ａは、加工硬化や焼入れなど、材質変化させる手段により、中央部３ｂよりも硬度が高くなるように加工され、中央部近傍に電池内方に凸の通電接触部７が設けられて入る。 The outer peripheral edge 3a of the rupture disk 3 is processed so as to have a hardness higher than that of the central portion 3b by means of changing the material, such as work hardening or quenching. Entered.
本発明を、実施例を用いて詳細に説明する。 The present invention will be described in detail using examples.
（実施例１）
〈正極の作製〉
コバルト酸リチウム９４質量部と、導電剤としての炭素粉末３質量部と、結着剤としてのポリフッ化ビニリデン（ＰＶｄＦ）３質量部と、Ｎ−メチル−２−ピロリドン（ＮＭＰ）と、を混合して正極活物質スラリーとした。この正極活物質スラリーを、ドクターブレード法を用いて、アルミニウム製の正極集電体の両面に塗布し、乾燥してスラリー調製時に必要であった溶剤（ＮＭＰ）を除去し、圧延して、正極を完成させた。
Example 1
<Preparation of positive electrode>
94 parts by mass of lithium cobaltate, 3 parts by mass of carbon powder as a conductive agent, 3 parts by mass of polyvinylidene fluoride (PVdF) as a binder, and N-methyl-2-pyrrolidone (NMP) are mixed. Thus, a positive electrode active material slurry was obtained. This positive electrode active material slurry was applied to both sides of an aluminum positive electrode current collector using a doctor blade method, dried to remove the solvent (NMP) required for slurry preparation, rolled, and positive electrode Was completed.
〈負極の作製〉
負極活物質としての黒鉛９６質量部と、増粘剤としてのカルボキシメチルセルロース（ＣＭＣ）２質量部と、結着剤としてのスチレンブタジエンゴム（ＳＢＲ）２質量部と、水とを混合して負極活物質スラリーとした。この負極活物質スラリーを、ドクターブレード法を用いて、銅製の負極集電体の両面に塗布し、乾燥してスラリー調製時に必要であった水を除去し、圧延して、負極を完成させた。
<Preparation of negative electrode>
96 parts by mass of graphite as a negative electrode active material, 2 parts by mass of carboxymethyl cellulose (CMC) as a thickener, 2 parts by mass of styrene butadiene rubber (SBR) as a binder, and water are mixed together. A material slurry was obtained. This negative electrode active material slurry was applied to both sides of a copper negative electrode current collector using a doctor blade method, dried to remove water necessary for slurry preparation, and rolled to complete the negative electrode. .
〈電極体の作製〉
上記正極及び負極を、ポリエチレン製の微多孔膜からなるセパレータ（厚み２２μｍ）を介して巻回することにより、電極体を作製した。
<Production of electrode body>
The positive electrode and the negative electrode were wound through a separator (thickness: 22 μm) made of a polyethylene microporous film to produce an electrode body.
〈封口体の作製〉
厚み０．４ｍｍのアルミニウム板の外周（直径１６．５ｍｍよりも外側部分）を厚みが０．３ｍｍとなるまでプレスすることによりアルミニウム板の周囲を加工硬化した。この後、Ｖ字状の破砕溝を形成すると共に中心部をプレスし通電接触部７（凸部）を形成した後、直径１７ｍｍに打ち抜いて、図１に示すようなラプチャーディスク３を作製した。このラプチャーディスク３の外周縁３ａの幅は０.２５ｍｍである。
この後、ラプチャーディスク３の上面に、ニッケルめっきを施された鉄製の端子キャップ５を、ニッケル−アルミニウムクラッド材製の中間材４を介してレーザ溶接し、下面に、樹脂製の絶縁板２を介してアルミニウム製の端子板１を溶接し、封口体１０を作製した。なお、中間材４のニッケル面は端子キャップ５と面し、アルミニウム面はラプチャーディスク３と面するように配置した。
<Preparation of sealing body>
The periphery of the aluminum plate was work-hardened by pressing the outer periphery of the 0.4 mm-thick aluminum plate (the outer portion outside the diameter of 16.5 mm) until the thickness became 0.3 mm. Thereafter, a V-shaped crushing groove was formed and the central portion was pressed to form a current-carrying contact portion 7 (convex portion), which was then punched out to a diameter of 17 mm to produce a rupture disk 3 as shown in FIG. The width of the outer peripheral edge 3a of the rupture disk 3 is 0.25 mm.
Thereafter, an iron terminal cap 5 plated with nickel is laser-welded to the upper surface of the rupture disk 3 via an intermediate material 4 made of nickel-aluminum clad, and a resin insulating plate 2 is formed on the lower surface. A terminal plate 1 made of aluminum was welded to produce a sealing body 10. In addition, the nickel surface of the intermediate material 4 was arranged to face the terminal cap 5, and the aluminum surface was arranged to face the rupture disk 3.
〈非水電解質の調製〉
エチレンカーボネート５０体積部と、ジエチルカーボネート５０体積部と、を混合し（２５℃、１気圧）、これに電解質塩としてのＬｉＰＦ６を１．０Ｍ（モル／リットル）となるように溶解し、非水電解質となした。
<Preparation of non-aqueous electrolyte>
50 parts by volume of ethylene carbonate and 50 parts by volume of diethyl carbonate are mixed (25 ° C., 1 atm), and LiPF 6 as an electrolyte salt is dissolved therein to 1.0 M (mol / liter). It became a water electrolyte.
〈電池の組み立て〉
円筒形の外装缶に、上記電極体を挿入し、電極体と外装缶、電極体と封口体とを溶接し、上記非水電解質を注液し、封口体により外装缶の開口を、ガスケットを介してカシメ封止することにより、実施例１に係る非水電解質二次電池を作製した。
<Assembly of battery>
Insert the electrode body into a cylindrical outer can, weld the electrode body and the outer can, and weld the electrode body and the sealing body, inject the nonaqueous electrolyte, and open the outer can with the sealing body. The nonaqueous electrolyte secondary battery according to Example 1 was manufactured by caulking and sealing.
（比較例１）
封口体の作製の際に、ラプチャーディスク３の外周縁３ａの加工硬化を行わなかったこと以外は、上記実施例１と同様にして、比較例１に係る非水電解質二次電池を作製した。
(Comparative Example 1)
A nonaqueous electrolyte secondary battery according to Comparative Example 1 was produced in the same manner as in Example 1 except that the outer peripheral edge 3a of the rupture disk 3 was not processed and cured during the production of the sealing body.
〔ラプチャーディスクのせり出し率の測定〕
上記実施例１、比較例１にかかる電池について、カシメ封止部分のラプチャーディスクの絶縁ガスケットへのせり出し率を測定した。この結果を、実施例１の値を１００とした相対値で下記表１に示す。
[Measurement of protrusion rate of rupture disk]
With respect to the batteries according to Example 1 and Comparative Example 1, the protruding rate of the crimped sealing portion to the insulating gasket of the rupture disk was measured. The results are shown in Table 1 below as relative values with the value of Example 1 as 100.
〔ラプチャーディスクのはみ出し率の測定〕
上記実施例１、比較例１にかかる電池のラプチャーディスクにおけるカシメ部分の硬度をビッカース硬さ測定法により測定した。比較例１の値を１００とした相対値で下記表１に示す。
[Measurement of protrusion rate of rupture disk]
The hardness of the caulking part in the rupture disk of the battery according to Example 1 and Comparative Example 1 was measured by the Vickers hardness measurement method. The relative values with the value of Comparative Example 1 as 100 are shown in Table 1 below.
〔密閉性試験〕
上記実施例１、比較例１にかかる電池をそれぞれ１０個ずつ用意し、１．８５ｍの高さからコンクリート床に落下させる試験を行った（縦方向、横方向、高さ方向からの落下を１セットとして合計１０セット）。この落下により、非水電解質の液漏れが確認されたものをＮＧと判定した。この結果を下記表１に示す。
[Sealing test]
Ten batteries each according to Example 1 and Comparative Example 1 were prepared, and a test was performed to drop the concrete floor from a height of 1.85 m (1 drop from the vertical direction, the horizontal direction, and the height direction). 10 sets as a set). Those in which liquid leakage of the non-aqueous electrolyte was confirmed due to this fall were judged as NG. The results are shown in Table 1 below.
上記表１から、加工硬化を行った実施例１では、せり出し率が１００％と、加工硬化を行っていない比較例１の１１５％よりも小さいことがわかる。 From Table 1 above, it can be seen that in Example 1 where work hardening was performed, the protrusion rate was 100%, which was smaller than 115% of Comparative Example 1 where work hardening was not performed.
このことは、次のように考えられる。加工硬化を行うことにより、ラプチャーディスクの外周縁部分の硬度が高まる（表１参照）。このため、カシメ力によってもラプチャーディスクがせり出すように変形することがない。他方、比較例１では、加工硬化を行っていないため、ラプチャーディスクの外周縁部分の硬度が小さく、カシメの力によってラプチャーディスクがせり出すように変形する。 This is considered as follows. By performing the work hardening, the hardness of the outer peripheral edge portion of the rupture disk is increased (see Table 1). For this reason, the rupture disk does not deform so as to protrude even by the caulking force. On the other hand, in Comparative Example 1, since work hardening is not performed, the hardness of the outer peripheral edge portion of the rupture disk is small, and the rupture disk is deformed so as to protrude by the force of caulking.
また、加工硬化を行った実施例１では、密閉性試験が０／１０ＮＧと、加工硬化を行っていない比較例１の３／１０ＮＧよりも優れていることがわかる。 Moreover, in Example 1 which performed the work hardening, it turns out that a sealing test is 0 / 10NG and 3 / 10NG of the comparative example 1 which is not performing work hardening.
このことは、次のように考えられる。加工硬化を行うことにより、ラプチャーディスクの外周縁部分の硬度が高まる（表１参照）。このため、カシメの力によってもラプチャーディスクがせり出すように変形することがない。このため、ガスケットと封口体との間に隙間が生じなくなり、密閉性が高まる。よって、液漏れが生じることがない。 This is considered as follows. By performing the work hardening, the hardness of the outer peripheral edge portion of the rupture disk is increased (see Table 1). For this reason, the rupture disk does not deform so as to protrude even by the caulking force. For this reason, a clearance gap does not arise between a gasket and a sealing body, and airtightness improves. Therefore, no liquid leakage occurs.
なお、上記実施例では、圧縮によりラプチャーディスクの外周縁を加工硬化させたが、ラプチャーディスクの外周縁を叩いて加工硬化させてもよい。また、焼き入れにより、外周縁を材質変化させ硬化させてもよい。 In the above embodiment, the outer peripheral edge of the rupture disk is processed and hardened by compression. However, the outer peripheral edge of the rupture disk may be hit and hardened. Further, the outer peripheral edge may be changed in material and hardened by quenching.
以上に説明したように、本発明によれば、密閉性が極めて高い密閉型電池を実現することができる。よって、産業上の利用可能性は大きい。 As described above, according to the present invention, it is possible to realize a sealed battery with extremely high sealing performance. Therefore, industrial applicability is great.
１ 端子板
２ 絶縁板
３ ラプチャーディスク
４ 中間材
５ 端子キャップ
６ 突出部
７ 通電接触部
８ 電極タブ
２０ 外装缶
３０ 絶縁ガスケット
DESCRIPTION OF SYMBOLS 1 Terminal board 2 Insulation board 3 Rupture disk 4 Intermediate material 5 Terminal cap 6 Protrusion part 7 Current supply contact part 8 Electrode tab 20 Exterior can 30 Insulation gasket
Claims (6)
前記封口体（１０）は、
電池外方に突出した突出部（６）を有する端子キャップ（５）と、
前記端子キャップ（５）より電池内方に位置し、電極タブ（８）を介して電極と電気的に接続された端子板（１）と、
前記端子キャップ（５）と前記端子板（１）との間に配置され、周辺部が前記端子キャップ（５）と通電可能に接続され、前記周辺部以外に設けられた通電接触部（７）が前記端子板（１）と通電可能に接続されるとともに、電池内部圧力が上昇したときには前記端子板（１）との通電が遮断される構造のラプチャーディスク（３）と、
前記端子板（１）の周辺部と前記ラプチャーディスク（３）との間に配置された絶縁部材（２）と、を有し、
前記ラプチャーディスク（３）の外周縁の硬度を中央部の硬度よりも高めた、
ことを特徴とする密閉型電池。 In a sealed battery sealed by caulking and fixing a sealing body (10) to an opening of a bottomed cylindrical outer can (20) via an insulating gasket (30),
The sealing body (10)
A terminal cap (5) having a protrusion (6) protruding outward from the battery;
A terminal plate (1) located inside the battery from the terminal cap (5) and electrically connected to the electrode via the electrode tab (8);
An energizing contact portion (7) disposed between the terminal cap (5) and the terminal plate (1), a peripheral portion thereof being connected to the terminal cap (5) so as to be energized, and provided at a portion other than the peripheral portion. Is connected to the terminal plate (1) so as to be able to be energized, and when the internal pressure of the battery rises, the rupture disk (3) having a structure in which the energization with the terminal plate (1) is interrupted,
An insulating member (2) disposed between a peripheral portion of the terminal plate (1) and the rupture disk (3);
The hardness of the outer peripheral edge of the rupture disk (3) is higher than the hardness of the central part,
A sealed battery characterized by that.
前記ラプチャーディスク（３）は、金属元素組成が同一の単一材料により構成されており、外周縁を加工硬化または焼入れすることにより外周縁の硬度が中央部よりも高められている、
ことを特徴とする密閉型電池。 The sealed battery according to claim 1,
The rupture disk (3) is composed of a single material having the same metal element composition, and the hardness of the outer peripheral edge is higher than that of the central part by work hardening or quenching the outer peripheral edge.
A sealed battery characterized by that.
前記ラプチャーディスク（３）の外周縁は、外装缶のカシメ固定力が直接作用する部分を含む領域である、
ことを特徴とする密閉型電池。 The sealed battery according to claim 1,
The outer peripheral edge of the rupture disk (3) is a region including a portion where the caulking fixing force of the outer can directly acts,
A sealed battery characterized by that.
前記ラプチャーディスク（３）の外周縁の厚みは、中央部の厚みよりも薄い、
ことを特徴とする密閉型電池。 The sealed battery according to claim 1,
The thickness of the outer peripheral edge of the rupture disk (3) is thinner than the thickness of the central part,
A sealed battery characterized by that.
前記ラプチャーディスク（３）の外周縁の硬度は、前記ラプチャーディスク（３）の中央部の硬度よりも１０％以上高い、
ことを特徴とする密閉型電池。 The sealed battery according to claim 1,
The hardness of the outer peripheral edge of the rupture disc (3) is 10% or more higher than the hardness of the central portion of the rupture disc (3).
A sealed battery characterized by that.
前記端子キャップ（５）と前記ラプチャーディスク（３）の周辺部とは、直接又は中間材（４）を介して溶接されている、
ことを特徴とする密閉型電池。 The sealed battery according to claim 1,
The terminal cap (5) and the peripheral portion of the rupture disk (3) are welded directly or via an intermediate material (4).
A sealed battery characterized by that.
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| CN104885259B (en) | 2012-12-19 | 2017-09-15 | 三洋电机株式会社 | Cylindrical rechargeable battery and its manufacture method |
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| US11495854B2 (en) * | 2016-06-23 | 2022-11-08 | Tesla, Inc. | Battery cell having welded battery cap |
| US20200136097A1 (en) * | 2017-07-20 | 2020-04-30 | Sanyo Electric Co., Ltd. | Cylindrical battery |
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