JP5456952B2 - Battery with safety valve - Google Patents

Battery with safety valve Download PDF

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JP5456952B2
JP5456952B2 JP2006040287A JP2006040287A JP5456952B2 JP 5456952 B2 JP5456952 B2 JP 5456952B2 JP 2006040287 A JP2006040287 A JP 2006040287A JP 2006040287 A JP2006040287 A JP 2006040287A JP 5456952 B2 JP5456952 B2 JP 5456952B2
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battery
sealing member
opening
sheet
safety valve
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JP2007220508A (en
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吉田  浩明
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GS Yuasa International Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10Energy storage using batteries

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Description

本発明は、電池容器に安全弁を備えた電池に関する。   The present invention relates to a battery provided with a safety valve in a battery container.

各種携帯用電子機器の電源として、乾電池、リチウム電池等の一次電池、鉛蓄電池、ニッケル−カドミウム(Ni−Cd)電池、ニッケル−水素(Ni−MH)電池等の二次電池が、用途に応じて、多数使用されている。   As power sources for various portable electronic devices, primary batteries such as dry batteries and lithium batteries, secondary batteries such as lead-acid batteries, nickel-cadmium (Ni-Cd) batteries, and nickel-hydrogen (Ni-MH) batteries are used depending on the application. Many are used.

電子機器の小形軽量化に伴い、近年、エネルギー密度の高い電池が求められている。高エネルギー密度電池としては、正極活物質にコバルト酸リチウム等の複合金属酸化物、負極活物質にグラファイト等の炭素材料、電解液に有機溶媒と電解質塩とを含む非水電解質を用いた、非水電解質二次電池がすでに市販されている。   Along with the reduction in size and weight of electronic devices, in recent years, batteries with high energy density have been demanded. As a high energy density battery, a non-aqueous electrolyte containing a composite metal oxide such as lithium cobaltate as a positive electrode active material, a carbon material such as graphite as a negative electrode active material, and an organic solvent and an electrolyte salt as an electrolyte is used. Water electrolyte secondary batteries are already on the market.

最近では、電子機器の消費電力の増大にともない、5Ah〜数百Ahの大容量の非水電解質二次電池が求められている。しかし、エネルギー密度が高くかつ大容量の電池は、誤使用された場合、破裂等の危険な状態になりやすいという問題があり、大容量電池の場合には、小型の場合と比較して危険性が高くなる。   Recently, with the increase in power consumption of electronic devices, a non-aqueous electrolyte secondary battery having a large capacity of 5 Ah to several hundreds Ah has been demanded. However, batteries with high energy density and large capacity tend to be in danger of rupture, etc. if misused. Becomes higher.

従来の非水電解質二次電池においては、容量の大小にかかわらず、いろいろな安全装置を用いることにより、電池が危険な状態に陥らないようにする工夫がされてきた。安全装置の代表的なものとして安全弁がある。安全弁は、なんらかの原因で電池の内圧が上昇した場合、一定の圧力以上になると内圧を開放して、電池が破裂しないようにするものである。   Conventional non-aqueous electrolyte secondary batteries have been devised to prevent the battery from falling into a dangerous state by using various safety devices regardless of the capacity. A typical safety device is a safety valve. When the internal pressure of the battery rises for some reason, the safety valve releases the internal pressure when the pressure exceeds a certain level so that the battery does not rupture.

電池用安全弁は、非水電解質二次電池以外の各種電池にも用いられてきた。特に、大容量電池の場合には、電池の内圧開放機構が必要であり、いろいろな安全弁が工夫されてきた。   Battery safety valves have been used in various batteries other than non-aqueous electrolyte secondary batteries. In particular, in the case of a large-capacity battery, a battery internal pressure release mechanism is required, and various safety valves have been devised.

従来の安全弁としては、特許文献1で開示されたゴム製の可逆弁を用いるもの、特許文献2や特許文献3で開示された金属箔を用いた破裂式弁を用いるもの、特許文献4で開示された電池ケースに溝を形成した薄い部分を安全弁とするものなど多数提案されている。   As a conventional safety valve, the one using a rubber reversible valve disclosed in Patent Document 1, the one using a bursting valve using a metal foil disclosed in Patent Document 2 and Patent Document 3, disclosed in Patent Document 4 Many proposals have been made to use a thin part of the battery case formed with a groove as a safety valve.

これら安全弁をエネルギー密度の高い大容量の非水電解質二次電池に採用する場合、安全弁の断面積を大きくするほど作動圧が低くなり、弁作動時の挙動が安全になることがわかっている。   When these safety valves are employed in high-capacity non-aqueous electrolyte secondary batteries with high energy density, it has been found that the greater the cross-sectional area of the safety valve, the lower the operating pressure and the safer the behavior during valve operation.

さらに、特許文献5には、電池容器に設けた開口部を閉塞する安全弁を備えた電池において、安全弁を予期せぬ外力から保護し、電池の異常時には確実に安全弁が作動するように、電池容器の外部に開口部を覆う安全弁保護部材を備える技術が開示されている。
特開平07−037568号公報 特開平07−211305号公報 実開平05−084025号公報 特開2000−149901号公報 特開2003−346762号公報
Further, in Patent Document 5, in a battery provided with a safety valve that closes an opening provided in the battery container, the battery container protects the safety valve from an unexpected external force and ensures that the safety valve operates when a battery abnormality occurs. The technology provided with the safety valve protection member which covers an opening part outside is disclosed.
Japanese Patent Laid-Open No. 07-037566 Japanese Patent Application Laid-Open No. 07-211305 Japanese Utility Model Publication No. 05-084025 JP 2000-149901 A JP 2003-346762 A

大容量の電池の場合、安全性確保のために安全弁の面積を約50mm(口径にすると約8mmφ)以上とする必要がある。安全弁の面積を大きくした電池において、特許文献2や特許文献3に記載された金属箔を用いると、指先や突起物等で金属箔を傷つけてしまい、安全弁の作動圧力が変動してしまうという問題があった。また、金属箔に穴が開くと、安全弁としての機能を失うとともに、外部から水分が浸入して電池性能が低下し、外部に電解液が漏れ出して周辺機器へ悪影響を及ぼす。 In the case of a large-capacity battery, the area of the safety valve needs to be about 50 mm 2 (about 8 mmφ in diameter) or more in order to ensure safety. If the metal foil described in Patent Document 2 or Patent Document 3 is used in a battery with a large safety valve area, the metal foil is damaged by fingertips or protrusions, and the operating pressure of the safety valve fluctuates. was there. In addition, when a hole is formed in the metal foil, the function as a safety valve is lost, moisture enters from the outside and the battery performance deteriorates, and the electrolyte leaks to the outside and adversely affects peripheral devices.

なお、特許文献1に記載されたゴム製の可逆弁は、ゴム弁体を通して外部から水分が侵入するという問題や、電解液と反応して劣化しやすいという問題があるため、非水系電池には用いることができなかった。   Note that the rubber reversible valve described in Patent Document 1 has a problem that moisture enters from the outside through the rubber valve body and a problem that it easily deteriorates by reacting with the electrolytic solution. It could not be used.

このように、大容量の電池において、安全弁の面積を増大させると、安全性の向上と引き換えに電池の長期信頼性を低下させるという欠点があった。   As described above, in a large-capacity battery, when the area of the safety valve is increased, there is a drawback that the long-term reliability of the battery is lowered in exchange for an improvement in safety.

このような欠点を改善するものとして、特許文献4に記載のように、金属製ケースに薄肉部を機械加工により形成することで破裂弁とし、内圧上昇時にはケースに裂け目が生じて圧力を開放するようにした電池が提案された。しかし、この電池は、機械加工コストが高く、金属の断裂を利用しているので破裂弁の作動圧が高く、かつ作動圧のバラツキも大きいという問題があった。   In order to remedy such drawbacks, as described in Patent Document 4, a thin-walled portion is formed in a metal case by machining to form a rupture valve, and when the internal pressure rises, a rift occurs in the case to release the pressure. A battery was proposed. However, this battery has a problem that the machining cost is high, and metal bursting is used, so that the operating pressure of the burst valve is high and the operating pressure varies greatly.

さらに、特許文献5に記載の、安全弁保護部材を備えた電池では、厚さ約75μmのアルミニウムやニッケルの箔を金属製電池容器の壁面にレーザー溶接で接合した安全弁を用いているため、厳密な溶接条件が要求され、製造工程が複雑になるという問題があった。また、電池外部から、指先や突起物等で金属箔を傷つける危険性を回避できなかった。   Furthermore, in the battery provided with the safety valve protection member described in Patent Document 5, a safety valve in which an aluminum or nickel foil having a thickness of about 75 μm is joined to the wall surface of a metal battery container by laser welding is used. There was a problem that welding conditions were required and the manufacturing process was complicated. In addition, the risk of damaging the metal foil from the outside of the battery with fingertips or protrusions could not be avoided.

本発明の目的は、電池外部からの力による安全弁の損傷を防止し、電池外部からの水分の浸入や電解液の外部への蒸発を防ぎ、異常時に内圧が一定値以上になると確実に安全弁が作動して、電池の内圧を開放することのできる、製造方法が簡単で、安全性に優れた、大容量の電池を提供することにある。   The purpose of the present invention is to prevent the safety valve from being damaged by the force from the outside of the battery, to prevent the ingress of moisture from the outside of the battery and the evaporation of the electrolyte to the outside. An object of the present invention is to provide a large-capacity battery that operates and can release the internal pressure of the battery, has a simple manufacturing method, and is excellent in safety.

請求項1の発明は、電池容器と前記電池容器に設けられた安全弁とを備えた電池において、前記安全弁は、電池の内圧が一定以上になると電池の内圧を開放するものであり、前記安全弁は、前記電池容器に開口部を設け、前記開口部を閉塞する封口部材をシートで覆うことで形成されており、前記シートは、前記封口部材全体と、前記開口部と前記封口部材との境界部とを電池外側から覆った状態で前記電池容器に接合されており、前記封口部材または前記開口部の少なくともいずれか一方には、フランジ部またはガイド部が設けられており、前記封口部材は、フランジ部またはガイド部によって係止された状態で電池の外側から前記開口部にはめ込まれていることを特徴とする。 The invention of claim 1 is a battery comprising a battery container and a safety valve provided in the battery container , wherein the safety valve releases the internal pressure of the battery when the internal pressure of the battery exceeds a certain level. The battery container is provided with an opening, and a sealing member that closes the opening is covered with a sheet, and the sheet includes the whole sealing member and a boundary between the opening and the sealing member. DOO is bonded to the battery container in a state of Tsu covering from the battery outward, said to at least one of the sealing member or the opening, a flange portion or guide portion is provided, said sealing member, It is fitted into the opening from the outside of the battery in a state of being locked by a flange portion or a guide portion .

請求項1の発明によれば、電池容器に設けた開口部が、電池の外側から開口部にはめ込まれた封口部材によって閉塞されており、封口部材全体を電池外側から覆うシートを備えているため、電池外部からの水分侵入や電池内部の電解液の漏れや蒸発を確実に防止することができ、高信頼性の電池を得ることができる。   According to the first aspect of the present invention, the opening provided in the battery container is closed by the sealing member fitted into the opening from the outside of the battery, and includes a sheet that covers the entire sealing member from the outside of the battery. In addition, moisture intrusion from the outside of the battery and leakage or evaporation of the electrolyte solution inside the battery can be reliably prevented, and a highly reliable battery can be obtained.

また、電池容器に設けた開口部に、電池の外側から封口部材がはめ込まれただけであるため、封口部材を電池容器にレーザー溶接等をする必要がなく、製造方法か簡単となる。   Further, since the sealing member is only fitted into the opening provided in the battery container from the outside of the battery, it is not necessary to laser-weld the sealing member to the battery container, and the manufacturing method is simplified.

さらに、電池容器に設けた開口部に封口部材がはめ込まれているため、外部からの機械的強度も高く、外部からシートに力が加わった場合、シートは封口部材に押し付けられ、積層シートに傷がついたり、穴が開いたりするのを確実に防止し、電池の安全性を高い次元で保証することができる。   Furthermore, since the sealing member is fitted in the opening provided in the battery container, the mechanical strength from the outside is high, and when a force is applied to the sheet from the outside, the sheet is pressed against the sealing member, and the laminated sheet is damaged. It is possible to reliably prevent the occurrence of cracks and holes and ensure the safety of the battery at a high level.

そして、異常時(電池内圧上昇時)には、封口部材の周囲に沿った、電池容器とシートの接合部が剥離し、電池に大面積の開口部が生じて電池内圧を円滑に開放することができ、電池の安全性を確保できるようになる。   In an abnormal state (when the internal pressure of the battery increases), the joint between the battery container and the sheet along the periphery of the sealing member is peeled off, and a large-area opening is created in the battery to smoothly release the internal pressure of the battery. Battery safety can be ensured.

本発明は、電池容器とその内部に収納された発電要素と電解質とを備えた電池の安全弁に関するもので、電池容器に開口部を設け、この開口部を閉塞する封口部材と、少なくとも電池容器に設けた開口部と封口部材との境界部を電池外側から覆うシートとを備えたものである。そして、この封口部材は電池の外側から開口部にはめ込まれている。また、このシートは電池容器に溶着されている。   The present invention relates to a battery safety valve for a battery including a battery container, a power generation element housed therein, and an electrolyte, the battery container having an opening, a sealing member for closing the opening, and at least the battery container. A sheet is provided that covers the boundary between the provided opening and the sealing member from the outside of the battery. The sealing member is fitted into the opening from the outside of the battery. The sheet is welded to the battery container.

図1に本発明の電池外観の一例を示す。図1において、1は電池容器、2は電池容器の一部である電池蓋、3は封口部材、4はシート、は正極端子、は負極端子である。図1の例では、開口部(図示せず)は角形電池容器1の側面に設けられ、この開口部に、電池の外側から封口部材3がはめ込まれており、シート4は開口部と封口部材3との境界部を電池外側から覆っている。そして、シート4は電池容器1に熱溶着されている。また、正極端子および負極端子は、ハーメチックシールで絶縁されて電池蓋に取り付けられている。
FIG. 1 shows an example of the appearance of the battery according to the present invention. In FIG. 1, 1 is a battery container, 2 is a battery lid which is a part of the battery container, 3 is a sealing member, 4 is a sheet, P is a positive electrode terminal, and N is a negative electrode terminal. In the example of FIG. 1, an opening (not shown) is provided on the side surface of the rectangular battery container 1, and the sealing member 3 is fitted into the opening from the outside of the battery, and the sheet 4 is formed of the opening and the sealing member. 3 is covered from the outside of the battery. The sheet 4 is thermally welded to the battery container 1. The positive electrode terminal P and the negative electrode terminal N are insulated by a hermetic seal and attached to the battery lid.

なお、本発明の電池の形状は、図1に示した角形以外に、円筒形や長円筒形とすることができる。   In addition, the shape of the battery of this invention can be made into a cylindrical shape or a long cylindrical shape other than the square shape shown in FIG.

電池容器に設ける開口部の形状は、円形、長円筒形、楕円形、四角形、多角形など、あらゆる形状のものを用いることができる。ただし、開口面積を任意の大きさに調整しやすいことや、開口部にはめ込む封口部材の製造に低コストなプレス加工性を用いることを考慮した場合、円形、長円形、または角部にR部を有する四角形のような、比較的単純な形状とすることが好ましい。   As the shape of the opening provided in the battery container, any shape such as a circle, a long cylindrical shape, an ellipse, a quadrangle, and a polygon can be used. However, when considering that it is easy to adjust the opening area to an arbitrary size, and that low-cost press workability is used for manufacturing a sealing member that fits into the opening, a round portion, an oval shape, or an R portion at a corner portion It is preferable to use a relatively simple shape such as a quadrangle having

そして、開口部を設置する位置は、電池の側面が適しているが、電池底や電池蓋に設置してもよい。また、発電要素の形状や電池容器内に収納された発電要素の向きを考慮して、開口部を設置することが好ましい。例えば、発電要素の形状が巻回型の場合、電池が異常を起こして発電要素からガスが発生すると、ガスは発電要素の巻回軸に平行な方向に放出されるため、このガスが放出される方向に開口部を設けることが好ましい。また、開口部の数は必要に応じて複数個設置してよい。   And the position which installs an opening part is suitable for the side of a battery, but you may install in a battery bottom or a battery cover. Further, it is preferable to install the opening in consideration of the shape of the power generation element and the direction of the power generation element housed in the battery container. For example, when the shape of the power generation element is a winding type, if the battery malfunctions and gas is generated from the power generation element, the gas is released in a direction parallel to the winding axis of the power generation element. It is preferable to provide an opening in the direction. A plurality of openings may be installed as necessary.

電池内部で発生したガスは、安全弁が作動した場合、この開口部を通って電池外部に放出され、電池の内圧が開放される。   When the safety valve is activated, the gas generated inside the battery is released to the outside of the battery through this opening, and the internal pressure of the battery is released.

封口部材の形状は開口部の形状に合わせた形状とし、電池外部から開口部にはめ込まれる。なお、封口部材の機能は、シートに外部から力が加わった場合にシートに穴が開いたり破れたりしないように、シートを保護することにあり、電解液の漏れを本質的に防ぐものではない。すなわち、封口部材で開口部を密閉する必要はないので、封口部材は開口部にはめ込まれているだけで十分であり、電池容器に溶接をする必要はない。したがって、場合によっては、封口部材を穴の開いた形状としてもよい。   The shape of the sealing member is a shape that matches the shape of the opening, and is fitted into the opening from the outside of the battery. The function of the sealing member is to protect the sheet so that the sheet will not be pierced or torn when an external force is applied to the sheet, and does not essentially prevent leakage of the electrolyte. . That is, since it is not necessary to seal the opening with the sealing member, it is sufficient that the sealing member is fitted in the opening, and it is not necessary to weld the battery container. Therefore, in some cases, the sealing member may have a shape with a hole.

封口部材の材質としては、例えばアルミニウム、鉄、ニッケル、ステンレス鋼を用いることができる。金属の電位差によるケースの腐食や機械的強度を考慮すると、電池ケースと同じ材質とすることが好ましい。また、金属に限らず、ポリエチレン(PE)、ポリプロピレンや(PP)ポリフェニレンサルファイド(PPS)等の樹脂を用いてもよい。封口部材としては、電解液と接触しても化学反応しない材質を選ぶ必要がある。   As the material of the sealing member, for example, aluminum, iron, nickel, or stainless steel can be used. Considering the case corrosion and mechanical strength due to the potential difference of the metal, it is preferable to use the same material as the battery case. Further, not limited to metals, resins such as polyethylene (PE), polypropylene, and (PP) polyphenylene sulfide (PPS) may be used. As the sealing member, it is necessary to select a material that does not chemically react even when it comes into contact with the electrolytic solution.

封口部材の断面形状は、電池容器に設けた開口部に嵌め込みやすい形状を選択すればよい。封口部材の周囲にフランジ部を有していても良いし、部分的にフランジ部を設たり、平板としてもよい。しかし、平板とする場合は、電池容器側に平板を受けるためのガイドを作製する必要があるため、フランジ部を有する封口部材とする方がコスト面で優れている。   The cross-sectional shape of the sealing member may be selected so that it can be easily fitted into the opening provided in the battery container. A flange portion may be provided around the sealing member, or the flange portion may be partially provided or a flat plate. However, in the case of using a flat plate, it is necessary to prepare a guide for receiving the flat plate on the battery container side, so that a sealing member having a flange portion is superior in terms of cost.

なお、封口部材にフランジ部を設ける場合や電池容器側にガイドを作製する場合、外部からの力に耐える機械的強度が必要となる。そのためには、封口部材の周囲にその面積の10%以上にフランジもしくはガイドを有することが好ましい。   In addition, when providing a flange part in a sealing member, or when producing a guide in the battery container side, the mechanical strength which bears the force from the outside is required. For that purpose, it is preferable to have a flange or a guide around 10% or more of the area around the sealing member.

封口部材を電池外部から覆うシートは、安全弁として働き、電池容器に接合されている。そして、電池の内圧が上昇して一定の値に達した場合、この接合部が剥離して、電池の内圧が開放される。また、このシートは、電池が正常な状態では、外部から電池内部への水の侵入を防止する機能を有する。   The sheet that covers the sealing member from the outside of the battery functions as a safety valve and is joined to the battery container. And when the internal pressure of a battery rises and reaches a fixed value, this junction part peels and the internal pressure of a battery is open | released. Moreover, this sheet has a function of preventing water from entering the battery from the outside when the battery is in a normal state.

シートの材質としては、金属薄膜、合成樹脂フィルム、金属薄膜と合成樹脂フィルムとを組み合わせたものなどを用いることができる。ただし、シートの内側は、電解液と接触する可能性があるため、電解液と反応しない材質とする必要がある。   As the material of the sheet, a metal thin film, a synthetic resin film, a combination of a metal thin film and a synthetic resin film, or the like can be used. However, since the inside of the sheet may come into contact with the electrolytic solution, it is necessary to use a material that does not react with the electrolytic solution.

シートの接合部が剥離する圧力は、接合条件や接合部分の面積などを組み合わせることで調整することができる。   The pressure at which the bonded portion of the sheet peels can be adjusted by combining the bonding conditions, the area of the bonded portion, and the like.

シートの材質に金属薄膜を用いる場合には、シートと電池容器との接合には、レーザー溶接や超音波溶接などの方法を用いることができ、また、シートの材質に合成樹脂フィルムを用いる場合には、シートと電池容器との接合には、熱溶着や接着などの方法を用いることができる。ただし、合成樹脂フィルムを単独で用いる場合には、水を通さず、電解液と反応しない材質を選択する必要がある。   When a metal thin film is used as the material for the sheet, a method such as laser welding or ultrasonic welding can be used for joining the sheet and the battery container. When a synthetic resin film is used as the material for the sheet, For joining the sheet and the battery container, methods such as thermal welding and adhesion can be used. However, when a synthetic resin film is used alone, it is necessary to select a material that does not allow water to pass through and does not react with the electrolytic solution.

したがって、シートとしては、少なくとも熱溶着性樹脂フィルム層と金属箔層との二層を備えた積層シート、または、少なくとも熱溶着性樹脂フィルム層と金属箔層と剛性を有する樹脂フィルム層との三層積層シートを用いることが好ましい。   Therefore, as the sheet, a laminated sheet comprising at least two layers of a heat-weldable resin film layer and a metal foil layer, or at least three layers of a heat-weldable resin film layer, a metal foil layer, and a rigid resin film layer. It is preferable to use a layer laminated sheet.

例えば、熱溶着性樹脂フィルム層と金属箔層と剛性を有する樹脂フィルム層の三層積層体を用いる場合、積層の順序は、熱融着性樹脂フィルム層/金属箔層/剛性を有する樹脂フィルム層とすることが好ましい。   For example, when a three-layer laminate of a heat-weldable resin film layer, a metal foil layer, and a rigid resin film layer is used, the order of lamination is as follows: heat-fusible resin film layer / metal foil layer / rigid resin film A layer is preferred.

これらの二層積層シートや三層積層シートを用いる場合、電池容器と熱溶着性樹脂フィルム層とは熱溶着で接合することができ、シートの接合部が剥離する圧力は、熱溶着性樹脂フィルム層の材質、熱溶着部分の面積、温度や時間などの熱溶着条件などを組み合わせることで調整することができる。また、積層シートは、金属薄膜と比較して、コストが低いという利点がある。   When these two-layer laminated sheets or three-layer laminated sheets are used, the battery container and the heat-weldable resin film layer can be joined by heat welding, and the pressure at which the joint portion of the sheet peels is the heat-weldable resin film. It can be adjusted by combining the material of the layer, the area of the heat welded portion, the heat welding conditions such as temperature and time, and the like. Further, the laminated sheet has an advantage that the cost is low as compared with the metal thin film.

シートの熱融着性樹脂フィルム層には、例えばポリエチレン、アイオノマー、エチレンビニルアセテート(EVA)などを用いることができる。また、金属箔層としては、例えばアルミニウム箔、ニッケル箔等の、水を通さない材質を用いることができる。   For the heat-fusible resin film layer of the sheet, for example, polyethylene, ionomer, ethylene vinyl acetate (EVA), or the like can be used. Moreover, as a metal foil layer, the material which does not let water pass, such as aluminum foil and nickel foil, can be used, for example.

また、剛性を有する樹脂層は、電池外部からのひっかきキズのような外力によって金属箔層にキズがつくのを防ぐための層である。そこで、剛性を有する樹脂層の材質としては、例えば、ポリエチレンテレフタレート(PET)、ナイロンなどを用いることができる。   The rigid resin layer is a layer for preventing the metal foil layer from being scratched by an external force such as a scratch from the outside of the battery. Therefore, as the material of the resin layer having rigidity, for example, polyethylene terephthalate (PET), nylon, or the like can be used.

本発明に用いる三層積層シートの具体的な材質の例としては、PE/アルミニウム箔/PETからなる三層積層フィルムがある。   As an example of a specific material of the three-layer laminated sheet used in the present invention, there is a three-layer laminated film made of PE / aluminum foil / PET.

シートの形状は、単純なシート状でもよいし、バターカップ状に凸形状に成形加工してもよい。封口部材がフランジ部を有し、電池容器の表面から突出する場合は、シール性に優れるバターカップ形状とすることが好ましい。   The shape of the sheet may be a simple sheet shape or may be formed into a convex shape in a butter cup shape. When a sealing member has a flange part and protrudes from the surface of a battery container, it is preferable to set it as a buttercup shape excellent in sealing performance.

また、封口部材をシートで覆う場合、封口部材全体を覆ってもよいし、例えば開口部および封口部材が円形の場合には、電池容器と封口部材の境界部分をドーナツ形状のフィルムで覆ってもよい。   Moreover, when covering a sealing member with a sheet | seat, you may cover the whole sealing member, for example, when an opening part and a sealing member are circular, you may cover the boundary part of a battery container and a sealing member with a donut-shaped film. Good.

つぎに、本発明の、電池容器に設けた開口部と、封口部材と、シートとの関係の例の断面を図2〜図4で説明する。なお、図2〜図4においては、すべて、図の上部が電池外部、下部が電池内部とする。また図2〜図4において、記号1〜4は図1と同じものを示し、記号5は電池容器に設けた開口部、6は電池容器の開口部に設けたガイド、7は電池容器とシートとの接合部、8はシートの中央部の穴、9は封口部材のフランジ部である。なお、図2〜図4では、開口部と封口部材とシートはすべて円形のものを用いたが、円形以外の形状の場合も、同様の嵌め込み方法を用いることができる。   Next, a cross section of an example of the relationship between the opening provided in the battery container, the sealing member, and the sheet according to the present invention will be described with reference to FIGS. In FIGS. 2 to 4, the upper part of the figure is the outside of the battery and the lower part is the inside of the battery. 2 to 4, symbols 1 to 4 are the same as those in FIG. 1, symbol 5 is an opening provided in the battery container, 6 is a guide provided in the opening of the battery container, and 7 is a battery container and a sheet. 8 is a hole in the center of the sheet, and 9 is a flange portion of the sealing member. 2 to 4, the opening, the sealing member, and the sheet are all circular, but the same fitting method can be used for shapes other than circular.

なお、接合部7は、シートの材質が金属薄膜の場合はレーザー溶接などによる溶接部であり、シートの電池容器側の材質が熱融着性樹脂の場合は熱溶着による溶着部や接着剤を用いた接着部である。   The joint 7 is a welded part by laser welding or the like when the material of the sheet is a metal thin film, and a welded part or adhesive by thermal welding is used when the material of the battery container side of the sheet is a heat-fusible resin. It is the adhesion part used.

図2(a)は、平板状の封口部材3を開口部5に設けたガイド6に嵌め込み、電池の外部からシート4で封口部材3を覆い、シート4の周囲7で接合したものである。図2(b)は、平板状の封口部材3の厚みが電容器の厚さに等しい場合の例を示す。図2(c)は、開口部5にガイドはないが、封口部材3にガイドを設け、開口部5に嵌め込んだものであり、封口部材3は電池外部に突出している。図2(d)は、平板状の封口部材3を開口部5に設けたガイド6に嵌め込み、封口部材3は電池外部に突出している。
FIG. 2A shows a case where a flat sealing member 3 is fitted into a guide 6 provided in an opening 5, the sealing member 3 is covered with a sheet 4 from the outside of the battery, and joined around a periphery 7 of the sheet 4. 2 (b) shows an example of a case where the thickness of the flat plate-like sealing member 3 is equal to the thickness of the batteries container. In FIG. 2C, the opening 5 has no guide, but the sealing member 3 is provided with a guide and is fitted into the opening 5. The sealing member 3 protrudes outside the battery. In FIG. 2D, the flat sealing member 3 is fitted into a guide 6 provided in the opening 5, and the sealing member 3 projects outside the battery.

図3(a)および図3(b)は、シート4の中央部に穴8を設けたドーナツ形状のものを用いた例を示す。このような形状の場合、シート4と封口部材3の材質の組合せによっては、ドーナツ形状のシート4の内周部分と封口部材3との密着が不十分となる。その場合には、ドーナツ形状のシート4の内周部分と封口部材3とを、熱溶着、接着などの方法で接合することにより、電解液の漏れや電池外部からの水分の浸入を防ぐことができる。   FIG. 3A and FIG. 3B show an example in which a donut-shaped member having a hole 8 provided in the center portion of the sheet 4 is used. In the case of such a shape, depending on the combination of the material of the sheet 4 and the sealing member 3, the close contact between the inner peripheral portion of the donut-shaped sheet 4 and the sealing member 3 becomes insufficient. In that case, the inner peripheral portion of the doughnut-shaped sheet 4 and the sealing member 3 are joined by a method such as thermal welding or adhesion, thereby preventing leakage of the electrolyte solution or intrusion of moisture from the outside of the battery. it can.

図4は封口部材3の周囲にフランジ9を設けたものである。図4(a)は、封口部材3のフランジ部9を開口部に設けたガイド6 に嵌め込んだもので、封口部材3の厚みが電容器の厚さに等しい場合の例を示す。図4(b)は、シート4の中央部に穴8を設けたドーナツ形状のものを用いた例を示す。図4(c)は、開口部5にガイドはないが、封口部材3の周囲のフランジ部9を開口部5に嵌め込んだもので、封口部材3のフランジ部9は電池外部に突出している。
In FIG. 4, a flange 9 is provided around the sealing member 3. FIG. 4 (a), in which fitting the flange portion 9 of the sealing member 3 to the guide 6 provided in the opening, an example of a case where the thickness of the sealing member 3 is equal to the thickness of the batteries container. FIG. 4 (b) shows an example in which a donut shape having a hole 8 in the center of the sheet 4 is used. In FIG. 4C, there is no guide in the opening 5, but the flange 9 around the sealing member 3 is fitted into the opening 5, and the flange 9 of the sealing member 3 protrudes outside the battery. .

なお、図2(c)、図2(d)および図4(c)で示した、封口部材3が電池外部に突出している形状の場合には、シートの形状は、開口部が円形の場合には図5(a)に示すような、また、開口部が長方形の場合には図5(b)に示すような、バターカップ形状を用いると、電池容器とシートとの接合が容易となる。   2C, FIG. 2D, and FIG. 4C, when the sealing member 3 has a shape protruding to the outside of the battery, the sheet has a circular shape when the opening is circular. As shown in FIG. 5 (a), and when the opening is rectangular, if the butter cup shape is used as shown in FIG. 5 (b), the battery container and the sheet can be easily joined. .

本発明は、有機電解液を用いたリチウム一次電池、アルカリ水溶液を用いたNi−CdやNi−MH電池に使用することができるが、リチウムイオン電池等の非水電解質二次電池に適用するのが最適である。その理由は、リチウムイオン電池はエネルギー密度が高く、大きな安全弁面積を確保することが必要なためである。   The present invention can be used for a lithium primary battery using an organic electrolyte, a Ni-Cd or Ni-MH battery using an alkaline aqueous solution, but is applied to a non-aqueous electrolyte secondary battery such as a lithium ion battery. Is the best. The reason is that the lithium ion battery has a high energy density and it is necessary to ensure a large safety valve area.

特に、容量が5Ah以上で安全弁の断面積が50mm(口径にすると約8mmφ)以上必要な電池に適している。容量が10Ahを越え、断面積が100mm(口径にすると約10mmφ)以上となる場合、指先で安全弁を傷つける可能性が飛躍的に高くなるため最適となる。 In particular, it is suitable for batteries that require a capacity of 5 Ah or more and a sectional area of the safety valve of 50 mm 2 (about 8 mmφ in diameter) or more. When the capacity exceeds 10 Ah and the cross-sectional area is 100 mm 2 (about 10 mmφ in the case of the caliber), the possibility of damaging the safety valve with the fingertip is dramatically increased, which is optimal.

さらに、非水電解質二次電池の場合、電池内部へ水分が侵入すると性能が低下するため、高い密閉性が求められる。本発明を大容量の非水電解質二次電池に適用することで、誤使用時の安全性を高い次元で保証できるとともに、外部からの機械的強度も高く、かつ電池内への水分侵入や電池内の電解液漏れや蒸発のない、高信頼性の電池を提供することができる。   Furthermore, in the case of a non-aqueous electrolyte secondary battery, high moisture-tightness is required because performance deteriorates when moisture enters the battery. By applying the present invention to a large-capacity non-aqueous electrolyte secondary battery, it is possible to guarantee a high level of safety during misuse, high mechanical strength from the outside, and moisture intrusion into the battery. It is possible to provide a highly reliable battery that does not leak or evaporate.

以下、本発明の実施形態について、電池として非水電解質二次電池を用いた例を、図面を参照して説明する。   Hereinafter, an embodiment using a nonaqueous electrolyte secondary battery as a battery will be described with reference to the drawings.

[実施例1および比較例1〜3]
[実施例1]
本発明の非水電解質二次電池を次のようにして製作した。まず、角形電池ケースを次のように製作した。アルミニウムを成形して、厚み1mmの角形電池容器1および電池蓋2を製作した。得られた角形電池容器の外径寸法は幅130mm、高さ208mm、厚さ50mmであった。
[Example 1 and Comparative Examples 1 to 3]
[Example 1]
The non-aqueous electrolyte secondary battery of the present invention was manufactured as follows. First, a rectangular battery case was manufactured as follows. Aluminum was molded to produce a rectangular battery container 1 and a battery lid 2 having a thickness of 1 mm. The obtained rectangular battery container had an outer diameter of 130 mm in width, 208 mm in height, and 50 mm in thickness.

実施例1の非水電解質二次電池の外観は図1に示したものと同じである。図1に示すように、電池容器1の側面に直径30mmの円形の開口部を設け、この開口部にフランジ部を有するアルミニウム製の封口部材3を電池の外側からはめ込んだ。別に、PE/アルミニウム箔/PETからなる合計厚さ0.1mm、大きさが直径40mmの、円形の三層積層シート4を準備し、このシート4を電池容器の開口部および封口部材3に密着させ、シート4の周囲を電池容器に熱融着した。これにより、電池容器の開口部と封口部材の隙間は完全に密封される。   The external appearance of the nonaqueous electrolyte secondary battery of Example 1 is the same as that shown in FIG. As shown in FIG. 1, a circular opening having a diameter of 30 mm was provided on the side surface of the battery container 1, and an aluminum sealing member 3 having a flange portion in the opening was fitted from the outside of the battery. Separately, a circular three-layer laminated sheet 4 having a total thickness of 0.1 mm and a diameter of 40 mm made of PE / aluminum foil / PET is prepared, and this sheet 4 is adhered to the opening of the battery container and the sealing member 3. The periphery of the sheet 4 was heat-sealed to the battery container. Thereby, the clearance gap between the opening part of a battery container and a sealing member is sealed completely.

なお、電池容器1の側面に設けた開口部には封口部材3がはめ込まれているため、図1では開口部は図示していない。   In addition, since the sealing member 3 is inserted in the opening part provided in the side surface of the battery container 1, the opening part is not illustrated in FIG.

この角形非水電解質二次電池は、アルミニウム集電体に正極合材を塗布してなる正極と、銅集電体に負極合材を塗布してなる負極とがセパレータを介して巻回された長円巻回型電極群と、非水電解液とを、電池容器に収納したものである。   In this rectangular nonaqueous electrolyte secondary battery, a positive electrode formed by applying a positive electrode mixture to an aluminum current collector and a negative electrode formed by applying a negative electrode mixture to a copper current collector were wound through a separator. An ellipse wound electrode group and a non-aqueous electrolyte are housed in a battery container.

正極板は、正極活物質であるコバルト酸リチウム(LiCoO)である86質量%と、ポリフッ化ビニリデン(結着剤)8質量%と、アセチレンブラック(導電剤)6質量%とを混合した正極合材に、N−メチル−2−ピロリドン(NMP)を加えてペースト状に調製した後、これを厚さ20μmのアルミニウム箔集電体両面に塗布、乾燥することによって作製したもので、幅120mm、長さ約10mである。 The positive electrode plate is a positive electrode in which 86% by mass of lithium cobaltate (LiCoO 2 ) as a positive electrode active material, 8% by mass of polyvinylidene fluoride (binder), and 6% by mass of acetylene black (conductive agent) are mixed. N-methyl-2-pyrrolidone (NMP) was added to the compound material to prepare a paste, which was then applied to both sides of an aluminum foil current collector with a thickness of 20 μm and dried. The length is about 10 m.

負極板は、負極活物質である難黒鉛化性炭素90質量%とポリフッ化ビニリデン(結着剤)10質量%をN−メチルピロリドンに加えてペースト状に調製した後、これを厚さ10μmの銅箔集電体両面に塗布、乾燥することによって製作したもので、幅120mm、長さ約10mである。   The negative electrode plate was prepared in a paste form by adding 90% by mass of non-graphitizable carbon, which is a negative electrode active material, and 10% by mass of polyvinylidene fluoride (binder) to N-methylpyrrolidone, and this was then formed into a 10 μm thick It is manufactured by applying and drying on both sides of a copper foil current collector, and has a width of 120 mm and a length of about 10 m.

セパレータには、ポリエチレン微多孔膜を用いた。非水電解質としては、エチレンカーボネート(EC):ジメチルカーボネート(DMC):エチルメチルカーボネート(EMC)=25:35:40(体積比)の混合溶媒にLiPFを1mol/L溶解した溶液を用いた。 A polyethylene microporous membrane was used for the separator. As the non-aqueous electrolyte, a solution in which 1 mol / L of LiPF 6 was dissolved in a mixed solvent of ethylene carbonate (EC): dimethyl carbonate (DMC): ethyl methyl carbonate (EMC) = 25: 35: 40 (volume ratio) was used. .

このようにして、実施例1の公称容量100Ahの角形非水電解質二次電池(A)を製作した。   Thus, the square nonaqueous electrolyte secondary battery (A) having a nominal capacity of 100 Ah of Example 1 was manufactured.

[比較例1]
実施例1と同じ電池容器を用い、電池容器の側面に電池外部から切削加工を行い、実施例1と同じ大きさの直径30mmの円形状の、貫通していない厚さ200μmの薄肉部を設け、三層積層シートを用いなかった。開口部のシール方法以外は実施例1と同様にして、比較例1の角形非水電解質二次電池(B)を製作した。
[Comparative Example 1]
Using the same battery container as in Example 1, cutting is performed on the side surface of the battery container from the outside of the battery, and a circular part with a diameter of 30 mm and a thin part with a thickness of 200 μm that is not penetrated is provided as in Example 1. The three-layer laminated sheet was not used. A rectangular nonaqueous electrolyte secondary battery (B) of Comparative Example 1 was produced in the same manner as in Example 1 except for the method of sealing the opening.

比較例1の開口部の断面構造を図6に示す。図6において、記号10は薄肉部である。なお、図6〜図8においては、図2〜図4と同様に、図の上部が電池外部、下部が電池内部とする。   The cross-sectional structure of the opening of Comparative Example 1 is shown in FIG. In FIG. 6, symbol 10 is a thin portion. 6 to 8, as in FIGS. 2 to 4, the upper part of the figure is the outside of the battery and the lower part is the inside of the battery.

[比較例2]
実施例1と同じ電池容器を用い、電池容器の側面に直径30mmの円形の開口部を設け、この開口部を電池内部から直径40mmで厚さが100μmの円形アルニミウム薄膜で覆い、円形アルニミウム薄膜の周囲を電池容器にレーザー溶接し、三層積層シートを用いなかった。開口部のシール方法以外は実施例1と同様にして、比較例2の角形非水電解質二次電池(C)を製作した。
[Comparative Example 2]
Using the same battery container as that of Example 1, a circular opening having a diameter of 30 mm is provided on the side surface of the battery container, and this opening is covered with a circular aluminum thin film having a diameter of 40 mm and a thickness of 100 μm from the inside of the battery. The periphery was laser welded to a battery container, and a three-layer laminated sheet was not used. A square nonaqueous electrolyte secondary battery (C) of Comparative Example 2 was produced in the same manner as in Example 1 except for the method of sealing the opening.

比較例2の開口部の断面構造を図7に示す。図7において、記号11はアルミニウム薄膜、12はレーザー溶接部である。   A cross-sectional structure of the opening of Comparative Example 2 is shown in FIG. In FIG. 7, symbol 11 is an aluminum thin film, and 12 is a laser weld.

[比較例3]
実施例1と同じ電池容器を用い、電池容器の側面に直径30mmの円形の開口部を設けた。この開口部を電池外部から、実施例1で用いたのと同じ直径40mmの三層積層シートで覆い、三層積層シートの周囲を電池容器に熱融着した。開口部のシール方法以外は実施例1と同様にして、比較例3の角形非水電解質二次電池(D)を製作した。
[Comparative Example 3]
The same battery container as in Example 1 was used, and a circular opening having a diameter of 30 mm was provided on the side surface of the battery container. This opening was covered from the outside of the battery with a three-layer laminated sheet having the same diameter of 40 mm as used in Example 1, and the periphery of the three-layer laminated sheet was heat-sealed to the battery container. A square nonaqueous electrolyte secondary battery (D) of Comparative Example 3 was produced in the same manner as in Example 1 except for the method of sealing the opening.

比較例3の開口部の断面構造を図8に示す。図8において、記号4は三層積層シート、13は熱溶着部である。   A sectional structure of the opening of Comparative Example 3 is shown in FIG. In FIG. 8, symbol 4 is a three-layer laminated sheet, and 13 is a heat welded portion.

実施例1および比較例1〜3の電池A〜Dをそれぞれ20個製作し、過充電して安全弁作動時の内圧を調べた。試験条件は、温度25℃±10℃で、50A定電流で安全弁が作動するまで連続充電(上限電圧10V)とした。試験中は、電池電圧、温度、電流、および内圧を測定した。また、内圧の測定は、電池ケースに2mmの丸穴を設けて圧力計を接続して行った。過充電試験結果を表1にまとめた。   Twenty batteries A to D of Example 1 and Comparative Examples 1 to 3 were manufactured, respectively, and overcharged to examine the internal pressure when the safety valve was activated. The test conditions were a temperature of 25 ° C. ± 10 ° C. and continuous charging (upper limit voltage of 10 V) until the safety valve was activated at a constant current of 50A. During the test, battery voltage, temperature, current, and internal pressure were measured. The internal pressure was measured by providing a 2 mm round hole in the battery case and connecting a pressure gauge. The overcharge test results are summarized in Table 1.

Figure 0005456952
Figure 0005456952

表1から、本発明の実施例1の電池(A)、比較例2の電池(C)および比較例3の電池(D)の作動圧は4.5〜6.0kg/cmの範囲内であったのに対して、比較例1の電池(B)では10.0〜20.0kg/cmと弁作動圧が高くバラツキも大きかった。 From Table 1, the operating pressures of the battery (A) of Example 1 of the present invention, the battery (C) of Comparative Example 2 and the battery (D) of Comparative Example 3 are within the range of 4.5 to 6.0 kg / cm 2 . On the other hand, in the battery (B) of Comparative Example 1, the valve operating pressure was high at 10.0 to 20.0 kg / cm 2 and the variation was large.

また、比較例1の電池(B)では、弁作動時に大音響がして内容物が飛散するなど危険であったが、実施例1の電池(A)では、弁作動時の音が小さく、内容物の飛散もなく、きわめて安全性が高いことがわかった。   Further, in the battery (B) of Comparative Example 1, there was a danger such as a loud sound when the valve was operated and the contents were scattered, but in the battery (A) of Example 1, the sound during the valve operation was small, It was found that there was no scattering of the contents and it was extremely safe.

なお、比較例1の電池(B)薄肉部をより薄くして弁作動圧力を7〜10kg/cm程度へ低下させることを試みたが、薄肉部に亀裂が生じて電解液漏れ等がおこり易く、安定した加工が困難であった。 In addition, although the battery (B) of Comparative Example 1 was made thinner to reduce the valve operating pressure to about 7 to 10 kg / cm 2 , cracks occurred in the thin part and electrolyte leakage occurred. It was easy and stable processing was difficult.

つぎに、実施例1の電池(A)、比較例2の電池(C)および比較例3の電池(D)を新たに各100個作製し、各種作業における弁の破損数を比較した。その結果、封口部材のない比較例2の電池(C)および比較例3の電池(D)では、ともに5%の電池に破損がみられ、電解液漏れが観察されたのに対し、実施例1の電池(A)の破損率は0%であった。   Next, the battery (A) of Example 1, the battery (C) of Comparative Example 2, and the battery (D) of Comparative Example 3 were each newly manufactured, and the number of damaged valves in various operations was compared. As a result, in the battery (C) of Comparative Example 2 and the battery (D) of Comparative Example 3 without a sealing member, 5% of the batteries were damaged and electrolyte leakage was observed. The damage rate of battery 1 (A) was 0%.

[実施例2〜4]
[実施例2]
アルミニウム製の封口部材の代わりに、同じ形状で、材質がポリプロピレンの封口部材を用いたこと以外は実施例1と同様にして、公称容量100Ahの角形非水電解質二次電池(F)を製作した。
[Examples 2 to 4]
[Example 2]
A square nonaqueous electrolyte secondary battery (F) having a nominal capacity of 100 Ah was manufactured in the same manner as in Example 1 except that a sealing member made of polypropylene having the same shape and material was used instead of the sealing member made of aluminum. .

[実施例3]
直径40mmの円形の三層積層シートの代わりに、直径40mmで内径20mmの穴を設けたドーナツ形状の三層積層シートを用いたこと以外は実施例1と同様にして、公称容量100Ahの角形非水電解質二次電池(E)を製作した。
[Example 3]
Instead of the circular three-layer laminated sheet having a diameter of 40 mm, a rectangular non-layer having a nominal capacity of 100 Ah was used in the same manner as in Example 1 except that a doughnut-shaped three-layer laminated sheet having a diameter of 40 mm and an inner diameter of 20 mm was used. A water electrolyte secondary battery (E) was produced.

[実施例4]
直径40mmの円形の三層積層シートの代わりに、直径40mmで厚さが100μmの円形アルニミウム薄膜を用い、円形アルニミウム薄膜の周囲を電池容器にレーザー溶接したこと以外は実施例1と同様にして、公称容量100Ahの角形非水電解質二次電池(G)を製作した。
[Example 4]
Instead of the circular three-layer laminated sheet having a diameter of 40 mm, a circular aluminum thin film having a diameter of 40 mm and a thickness of 100 μm was used, and the periphery of the circular aluminum thin film was laser welded to the battery container in the same manner as in Example 1, A square nonaqueous electrolyte secondary battery (G) having a nominal capacity of 100 Ah was manufactured.

実施例2〜4の電池E〜Gをそれぞれ20個製作し、過充電して安全弁作動時の内圧を調べた。試験条件は実施例1などの場合と同じとした。過充電試験結果を表2にまとめた。   Twenty batteries E to G of Examples 2 to 4 were produced, overcharged, and the internal pressure when the safety valve was activated was examined. The test conditions were the same as in Example 1. The overcharge test results are summarized in Table 2.

Figure 0005456952
Figure 0005456952

表2から、本発明の実施例2〜4の電池(E)〜(G)の作動圧は、いずれも4.0〜6.0kg/cmの範囲で、安定していた。 From Table 2, the working pressures of the batteries (E) to (G) of Examples 2 to 4 of the present invention were all stable in the range of 4.0 to 6.0 kg / cm 2 .

以上の説明から明らかなように、本発明の非水電解質二次電池によれば、電池容器の開口部が封口部材により塞がれているため、外部からの機械的強度が高く、傷ついたり穴が開いたりするのを確実に防止することができる。さらに、開口部と封口部材との隙間を熱溶着性樹脂フィルムが配された積層シートでシールしているため、外部からの水分侵入や電池内部の電解液の蒸発を確実に防止することができる。   As is clear from the above description, according to the nonaqueous electrolyte secondary battery of the present invention, the opening of the battery container is closed by the sealing member, so that the mechanical strength from the outside is high, and it is damaged or damaged. Can be reliably prevented from opening. Furthermore, since the gap between the opening and the sealing member is sealed with a laminated sheet provided with a heat-welding resin film, it is possible to reliably prevent moisture from entering from the outside and evaporation of the electrolyte inside the battery. .

そして、異常時(電池内圧上昇時)には、蓋板の周囲にそって積層フィルムが容易に断裂、低圧力で安定して電池に大面積の開口部が生じて電池内圧を円滑に開放することができるため、電池の安全性を確保できるようになる。   When an abnormality occurs (when the internal pressure of the battery increases), the laminated film easily tears along the periphery of the cover plate, and a large-area opening is formed in the battery stably at a low pressure to smoothly release the internal pressure of the battery. Therefore, the safety of the battery can be ensured.

本発明の電池の外観の一例を示す図。The figure which shows an example of the external appearance of the battery of this invention. 本発明の電池容器の、開口部と封口部材とシートとの関係の例を示す断面図。Sectional drawing which shows the example of the relationship between an opening part, a sealing member, and a sheet | seat of the battery container of this invention. 本発明の電池容器の、ドーナツ状シートを用いた場合の、開口部と封口部材とシートとの関係の例を示す断面図。Sectional drawing which shows the example of the relationship between an opening part, a sealing member, and a sheet | seat at the time of using the doughnut-shaped sheet | seat of the battery container of this invention. 本発明の電池容器の、封口部材にフランジ部を設けた場合の、開口部と封口部材とシートとの関係の例を示す断面図。Sectional drawing which shows the example of the relationship between an opening part, a sealing member, and a sheet | seat at the time of providing a flange part in the sealing member of the battery container of this invention. バターカップ形状のシートの外観を示す図。The figure which shows the external appearance of a buttercup-shaped sheet | seat. 比較例の開口部と封口部材との関係を示す断面図。Sectional drawing which shows the relationship between the opening part and sealing member of a comparative example. 比較例2の開口部の断面構造を示す図。The figure which shows the cross-section of the opening part of the comparative example 2. FIG. 比較例3の開口部の断面構造を示す図。The figure which shows the cross-section of the opening part of the comparative example 3. FIG.

符号の説明Explanation of symbols

1 電池容器
2 電池蓋
3 封口部材
4 シート
5 開口部
6 ガイド
7 接合部
8 シートの中央部の穴
9 フランジ部
10 薄肉部
11 アルミニウムシート
12 レーザー溶接部
13 熱溶着部
P 正極端子
N 負極端子
DESCRIPTION OF SYMBOLS 1 Battery container 2 Battery cover 3 Sealing member 4 Sheet 5 Opening part 6 Guide 7 Joint part 8 Hole of the center part of a sheet | seat 9 Flange part 10 Thin part 11 Aluminum sheet 12 Laser welding part 13 Thermal welding part P Positive electrode terminal N Negative electrode terminal

Claims (2)

電池容器と前記電池容器に設けられた安全弁とを備えた電池において、
前記安全弁は、電池の内圧が一定以上になると電池の内圧を開放するものであり、
前記安全弁は、前記電池容器に開口部を設け、前記開口部を閉塞する封口部材をシートで覆うことで形成されており、
前記シートは、前記封口部材全体と、前記開口部と前記封口部材との境界部とを電池外側から覆った状態で前記電池容器に接合されており、
前記封口部材または前記開口部の少なくともいずれか一方には、フランジ部またはガイド部が設けられており、前記封口部材は、フランジ部またはガイド部によって係止された状態で電池の外側から前記開口部にはめ込まれている、電池。
In a battery comprising a battery container and a safety valve provided in the battery container ,
The safety valve is to release the internal pressure of the battery when the internal pressure of the battery reaches a certain level,
The safety valve is formed by providing an opening in the battery container and covering a sealing member that closes the opening with a sheet,
The sheet is joined to the battery container in a state in which the entire sealing member and a boundary between the opening and the sealing member are covered from the outside of the battery ,
At least one of the sealing member and the opening is provided with a flange or a guide, and the opening is locked from the outside of the battery in a state of being locked by the flange or the guide. to have been fitted, the battery.
電池容器に安全弁を備えた電池の製造方法において、
前記安全弁は、電池の内圧が一定以上になると電池の内圧を開放するものであり、
前記安全弁は、前記電池容器に開口部設け、前記開口部を閉塞する封口部材をシートで覆うことで形成されており、
前記シートは、前記封口部材全体と、前記開口部と前記封口部材との境界部とを電池外側から覆った状態で前記電池容器に接合されており、
前記封口部材または前記開口部の少なくともいずれか一方には、フランジ部またはガイド部が設けられており、前記封口部材は、フランジ部またはガイド部によって係止された状態で電池の外側から前記開口部にはめ込まれている、電池の製造方法。
In a battery manufacturing method comprising a safety valve in a battery container,
The safety valve is to release the internal pressure of the battery when the internal pressure of the battery reaches a certain level,
The safety valve is formed by providing an opening in the battery container and covering a sealing member that closes the opening with a sheet,
The sheet is joined to the battery container in a state in which the entire sealing member and a boundary between the opening and the sealing member are covered from the outside of the battery,
To at least one of the sealing member or the opening, the flange portion or guide portion is provided, the sealing member, the flange portion or the opening from the outside of the battery in locked state by the guide portion A method of manufacturing a battery that is fitted in .
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