JP4468290B2 - Explosion-proof structure of secondary battery - Google Patents

Explosion-proof structure of secondary battery Download PDF

Info

Publication number
JP4468290B2
JP4468290B2 JP2005330349A JP2005330349A JP4468290B2 JP 4468290 B2 JP4468290 B2 JP 4468290B2 JP 2005330349 A JP2005330349 A JP 2005330349A JP 2005330349 A JP2005330349 A JP 2005330349A JP 4468290 B2 JP4468290 B2 JP 4468290B2
Authority
JP
Japan
Prior art keywords
safety valve
explosion
secondary battery
pressure
press
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2005330349A
Other languages
Japanese (ja)
Other versions
JP2007141518A (en
Inventor
保範 下地
重男 松坂
龍 樋出
Original Assignee
株式会社ゼロム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ゼロム filed Critical 株式会社ゼロム
Priority to JP2005330349A priority Critical patent/JP4468290B2/en
Publication of JP2007141518A publication Critical patent/JP2007141518A/en
Application granted granted Critical
Publication of JP4468290B2 publication Critical patent/JP4468290B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Landscapes

  • Gas Exhaust Devices For Batteries (AREA)
  • Secondary Cells (AREA)

Description

この発明は、電解液を外気と隔離した密閉型の二次電池の防爆構造に関する。   The present invention relates to an explosion-proof structure for a sealed secondary battery in which an electrolytic solution is isolated from outside air.

携帯電話やその他の各種携帯端末（ＰＡＤ）のような小型電子機器等に広く使用されている二次電池は、例えばリチウム電池のような有機電解液電池（非水電解質電池）が主流となっている。有機電解液を外気と隔離した密閉型の二次電池は、通常以上の電流供給による過充電状態、あるいは誤使用による短絡状態で大電流が流れたりすると、電解液が急速に分解されてガスが発生し、このガスが電池内に充満して大きな内圧が生じ、場合によっては爆発することもある。   Secondary batteries widely used in small electronic devices such as mobile phones and other various portable terminals (PAD) are mainly organic electrolyte batteries (non-aqueous electrolyte batteries) such as lithium batteries. Yes. Sealed type secondary batteries with organic electrolyte separated from the outside air will rapidly decompose the electrolyte if a large current flows in an overcharged state due to current supply exceeding normal or in a short-circuit state due to misuse. It is generated and this gas fills the battery, creating a large internal pressure and, in some cases, exploding.

このような内圧による爆発を防止するため、従来から密閉型の二次電池の外装缶の上端部側又は底板に防爆用の安全弁装置を設けたものが知られている。その一例として、特許文献１の「二次電池の防爆構造」が公知である。この二次電池の防爆構造は、外装缶の端に固定した封口板又は底板に設けた安全弁から成り、この安全弁は、外周面に平板状凹部の第１加工部分を形成し、この凹部に切り欠き溝の第２加工部分を設け、その第２残厚を防爆圧＋αの圧力で切裂する板厚を有し、この第２加工部分に屈曲断面状の第３加工部分をその第３残厚が防爆圧で作動する厚さと成るようにしたというものである。   In order to prevent such an explosion due to internal pressure, there has been conventionally known an explosion-proof safety valve device provided on the upper end side or bottom plate of an outer can of a sealed secondary battery. As an example, the “explosion-proof structure of a secondary battery” of Patent Document 1 is known. The explosion-proof structure of the secondary battery is composed of a safety valve provided on a sealing plate or a bottom plate fixed to the end of the outer can. The safety valve forms a first processed portion of a flat plate-like recess on the outer peripheral surface, and is cut into the recess. A second processed portion of the notch groove is provided, and the second remaining thickness has a plate thickness that is torn at a pressure of explosion-proof pressure + α. A third processed portion having a bent cross-section is formed on the second remaining portion. The thickness is set to be the thickness that operates with explosion-proof pressure.

上記特許文献１の二次電池の防爆構造の安全弁は、一般にプレスベント形式と呼ばれ、外装缶の端に設けられる端板のアルミ板にプレス加工をし、薄肉部（溝）を所定形状（円又は長円）に形成したものである。これに対し、クラッドベント形式と呼ばれる安全弁が知られている。その一例として、特許文献２の「電池用安全弁付き電池ケース蓋」が公知である。この文献２の電池用安全弁素子は、貫通孔を穿設した金属基板と、貫通孔を閉塞するように基板上に積層された金属箔とから成る。金属基板は、鋼板、ステンレス鋼板、銅板又はアルミニウム板のいずれかとし、金属箔は、鋼箔、ステンレス箔、銅箔、アルミニウム箔、ニッケル箔又はニッケル−鉄合金箔のいずれかが用いられる。   The safety valve of the explosion-proof structure of the secondary battery described in Patent Document 1 is generally called a press vent type, and presses an aluminum plate of an end plate provided at the end of the outer can so that a thin portion (groove) has a predetermined shape ( Circle or oval). On the other hand, a safety valve called a clad vent type is known. As an example, “battery case lid with battery safety valve” of Patent Document 2 is known. The battery safety valve element of Document 2 includes a metal substrate having a through hole and a metal foil laminated on the substrate so as to close the through hole. The metal substrate is a steel plate, a stainless steel plate, a copper plate, or an aluminum plate, and the metal foil is a steel foil, stainless steel foil, copper foil, aluminum foil, nickel foil, or nickel-iron alloy foil.

ところで、上記クラッドベント形式の安全弁は、柔軟性があり、落下・変形強度に優れ、ベント作動（開裂）圧は金属箔の箔厚（膜厚）が関与して決まり、ベント開放性（ガス放出性）が優れ、低作動圧で安定して作動する。しかし、金属箔を熱圧着又は冷間圧接で金属基板に積層するため加工処理に時間が掛かり、金属箔には一般にピンホールが生じていることが多いため、全数のピンホール検査を要し、又金属箔を積層した基板を外装缶に取り付ける際も金属箔に傷が付かないようにするため取り付け作業にも時間が掛かり、このためコストが高くなるという問題がある。   By the way, the above-mentioned clad vent type safety valve is flexible, has excellent drop / deformation strength, and the vent operation (cleavage) pressure is determined by the foil thickness (film thickness) of the metal foil. Excellent stability) and stable operation at low operating pressure. However, since the metal foil is laminated on the metal substrate by thermocompression bonding or cold pressure welding, it takes a long time for processing, and the metal foil generally has pinholes in general. In addition, when the substrate laminated with the metal foil is attached to the outer can, the attachment work takes time in order to prevent the metal foil from being scratched, which increases the cost.

一方、プレスベント形式の安全弁は、端板に凹溝をプレス成形するため、コストは安価であるが、特に変形強度に問題があり、ベント作動（開裂）圧は主に缶の膨れに伴う蓋の変形が関与し、変形によるクラックでベント作用が始まる。即ち、内圧が発生して缶に膨れが生じ缶が変形すると、その変形に伴って安全弁の凹溝にクラックが発生して安全弁が作動する。このため、ベント開放性が劣り、ガスがベント作動時に直ちに放出されず、ガス放出性に問題が残っている。特に、特許文献１のプレスベント形式の安全弁では、約数ｋｇｆ／ｃｍ2 程度の低い所定圧力に防爆圧を設定し、この防爆圧以上の内圧で安全弁が作動するとしているが、本願の発明者等が上記安全弁の作動を確認したところ、実際には安全弁の作動に次のような問題がある。 On the other hand, a press vent type safety valve is low in cost because it is press-molded with a groove in the end plate, but there is a problem with the deformation strength in particular, and the vent operation (cleavage) pressure is mainly due to the swelling of the can. The venting action starts with cracks caused by deformation. That is, when the internal pressure is generated and the can is swollen and the can is deformed, a crack is generated in the concave groove of the safety valve and the safety valve is activated. For this reason, vent opening | release property is inferior, gas is not emitted immediately at the time of vent operation, but the problem remains in gas discharge | release property. In particular, in the press vent type safety valve of Patent Document 1, the explosion-proof pressure is set to a predetermined pressure as low as about several kgf / cm 2 , and the safety valve operates at an internal pressure higher than this explosion-proof pressure. Have confirmed the operation of the safety valve, there are actually the following problems in the operation of the safety valve.

即ち、安全弁の凹溝に第３加工部分をその第３残厚が防爆圧で作動する厚さに設定しているため、理論上は上記約数ｋｇｆ／ｃｍ2 の作動圧で安全弁が作動する筈であるが、実際には安全弁として設定した通りには作動しない。これは、安全弁を形成した端板（封口板１ａ）を外装缶に取り付ける前の単体の状態で試験したからであり、実際に外装缶にこの端板を固定して内圧を作動させると、上記設定圧では作動しない。つまり、プレスベント形式の安全弁としてクラックが第３残厚に直ちに生じることはなく、やはり外装缶の変形に伴ってクラックが生じる。従って、安全弁としての作動は内圧が上記数ｋｇｆ／ｃｍ2 で作動したのではなく、缶の変形に伴ってクラックが生じたこととなる。
特開２００１−２３５９６号公報 特開平９−２２３４９０号公報 That is, the third processed portion is set in the concave groove of the safety valve so that the third remaining thickness is operated at the explosion-proof pressure, so that the safety valve is theoretically operated at the operating pressure of about several kgf / cm 2. Although it is a trap, it does not actually operate as set as a safety valve. This is because the end plate (sealing plate 1a) on which the safety valve is formed was tested in a single state before being attached to the outer can. When the end plate was actually fixed to the outer can and the internal pressure was activated, Does not operate at set pressure. That is, as a press vent type safety valve, a crack does not immediately occur in the third remaining thickness, and a crack also occurs with the deformation of the outer can. Therefore, the operation as a safety valve does not operate at the internal pressure of the above-mentioned several kgf / cm 2 , but a crack is generated with the deformation of the can.
JP 2001-23596 A JP-A-9-223490

この発明は、上記の問題に留意して、クラッドベント形式ではなくプレスベント形式の安価な安全弁を採用し、封口板単体での試験圧ではなく、外装缶の端部に取り付けた状態で二次電池に対して設定された設定圧で封口板に予め形成された安全弁が、外装缶の大きな膨れを伴わず、防爆圧以上の内圧の作動時に確実に安全弁として作動する二次電池の防爆構造を提供することを課題とする。   In consideration of the above problems, the present invention adopts an inexpensive safety valve of the press vent type instead of the clad vent type, and the secondary pressure is not attached to the test pressure of the sealing plate alone but attached to the end of the outer can. The safety valve formed in advance on the sealing plate at the set pressure set for the battery has a secondary battery explosion-proof structure that works as a safety valve when operating at an internal pressure higher than the explosion-proof pressure without causing a large swelling of the outer can. The issue is to provide.

この発明は、上記の課題を解決する手段として、発電要素を内蔵し、電池外装缶の端板に内圧で作動する安全弁を設けた二次電池において、安全弁を設ける上記端板の板素材の所定位置に第１残厚ｔ１を有する安全弁用凹部を設け、安全弁用凹部内にさらに薄い第２残厚ｔ２を有しかつ外周辺に波形屈曲部を有する加工凹部を設け、この加工凹部の内周寄り位置に第３残厚ｔ３を有する溝部を形成し、所定の防爆圧以上の内圧発生時に溝部を切裂させて内圧を逃がすことにより安全弁を作動させるように構成した二次電池の防爆構造としたのである。   As a means for solving the above-mentioned problems, the present invention provides a secondary battery in which a power generation element is incorporated and a safety valve that operates at an internal pressure is provided on an end plate of a battery outer can. A recess for the safety valve having a first remaining thickness t1 is provided at a position, a machining recess having a thinner second remaining thickness t2 and a corrugated bent portion is provided in the outer periphery, and the inner periphery of the machining recess A secondary battery explosion-proof structure configured to form a groove portion having a third remaining thickness t3 at a shift position and to actuate a safety valve by releasing the internal pressure by breaking the groove portion when an internal pressure greater than a predetermined explosion-proof pressure is generated; It was.

上記の構成としたこの発明による二次電池の防爆構造では、所定の防爆圧以上の内圧が発生すると、二次電池の外装缶に大きな変形を与えることなく確実に作動し、プレスベント形式の安全弁でありながら、クラッドベントのようにベント開放性に優れている。通常以上の電流供給による過充電状態、あるいは誤使用による短絡状態で大電流が流れたりすると、電解液が急速に分解されてガスが発生し、このガスが電池内に充満して大きな内圧が生じることがある。   In the explosion-proof structure of the secondary battery according to the present invention configured as described above, when an internal pressure higher than a predetermined explosion-proof pressure occurs, the secondary battery outer can reliably operates without causing a large deformation, and a press vent type safety valve However, it is excellent in vent opening like a clad vent. When a large current flows in an overcharged state due to a current supply exceeding the normal level or in a short-circuit state due to misuse, the electrolyte is rapidly decomposed to generate gas, which fills the battery and generates a large internal pressure. Sometimes.

しかし、このような所定の防爆圧以上の内圧が生じた場合でも、外装缶が大きく変形することなく上記の安全弁では加工凹部内の溝部より内周側の薄板部が溝部の位置で切裂する。このためクラッドベントのように防爆圧以上の内圧で安全弁として確実に作動する。これは、所定の防爆圧以上の内圧に対して外装缶端板の第１残厚ｔ１を有する安全弁用凹部内に設けた加工凹部の第２残厚ｔ２の残厚が大きく、かつその屈曲部の弾性強度が大きいため上記の内圧では簡単に変形しないのに対して、上記加工凹部の外周辺に波形屈曲部とその内周側には溝部を形成し、溝部ではごく薄い残厚ｔ３となっているため、この位置で確実に所定の防爆圧以上の内圧に対して反応し、安全弁として作動するからである。   However, even when an internal pressure higher than the predetermined explosion-proof pressure occurs, the outer can can be deformed without any significant deformation in the above-described safety valve, and the thin plate portion on the inner peripheral side of the groove portion in the processing recess is torn at the position of the groove portion. . For this reason, it operates reliably as a safety valve at an internal pressure higher than the explosion-proof pressure like a clad vent. This is because the second remaining thickness t2 of the processed recess provided in the recess for the safety valve having the first remaining thickness t1 of the outer can end plate with respect to the internal pressure equal to or higher than the predetermined explosion-proof pressure is large, and the bent portion thereof However, it is not easily deformed by the above internal pressure because of its high elastic strength. On the other hand, a corrugated bent portion and a groove portion are formed on the outer peripheral side of the processed recess, and the groove portion has a very thin remaining thickness t3. Therefore, at this position, it reacts reliably with respect to the internal pressure higher than the predetermined explosion-proof pressure and operates as a safety valve.

また、上記のように形成した溝部は、端板の単体で試験圧を掛けて作動する圧力と二次電池に端板を装着した状態で二次電池が発生する内圧とがほぼ一致した状態で作動し、従来の二次電池のように端板単体での試験圧と二次電池に装着した状態では防爆圧が試験圧と大きく異なるということはなく、従って二次電池に発生する内圧で外装缶が大きく変形しない範囲内で設定される設定圧に一致する作動圧で溝部が切裂し、安全弁として確実に作動する。   In addition, the groove formed as described above is in a state where the pressure that is applied by applying a test pressure to the end plate alone and the internal pressure generated by the secondary battery when the end plate is attached to the secondary battery are substantially the same. The explosion-proof pressure does not differ significantly from the test pressure when the end plate alone and the secondary battery are mounted as in the case of conventional secondary batteries. The groove is torn at an operating pressure that matches the set pressure set within a range where the can does not deform greatly, and the can reliably operates as a safety valve.

以上のように、この発明の二次電池の防爆構造は、安全弁用凹部内にさらに薄い第２残厚を有しかつ外周辺に波形屈曲部を有する加工凹部を設け、この加工凹部の内周寄り位置に第３残厚を有する溝部を形成し、所定の防爆圧以上の内圧発生時に溝部を切裂させて内圧を逃がすことにより安全弁を作動させるようにしたから、安全弁を確実に作動させ、かつプレスベント形式で経済的なコストの二次電池の防爆構造が得られるという利点がある。   As described above, the explosion-proof structure of the secondary battery according to the present invention is provided with the processing concave portion having the thinner second remaining thickness in the concave portion for the safety valve and the corrugated bent portion on the outer periphery, and the inner periphery of the processing concave portion. Since the groove portion having the third remaining thickness is formed at the offset position and the safety valve is operated by releasing the internal pressure by rupturing the groove portion when the internal pressure exceeding the predetermined explosion-proof pressure is generated, the safety valve is operated reliably. In addition, there is an advantage that an explosion-proof structure of the secondary battery can be obtained in a press vent type at an economical cost.

以下、この発明の実施の形態について図面を参照して説明する。図１は実施形態の二次電池Ａ１の外観斜視図を示す。図示の二次電池は角型電池であるが、円形断面や長円形その他各種の断面形状のものについても以下の構成は同様に適用される。ただし、内蔵される発電要素及びその接続金具の詳細は図示及び説明を省略している。外装缶１は下底板１ｂで閉じられ、その内部に発電要素２を収容して、上端を封口板１ａにより閉じ、密封状に形成されている封口板１ａには、図示しない電極部を設けるための円形の孔３，４が設けられ、かつその一端寄りに安全弁５が形成され、この安全弁５により防爆構造が構成されている。なお、５Ｆは封口板１ａの外端面である（例えば、図２参照）。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of the secondary battery A1 of the embodiment. The illustrated secondary battery is a rectangular battery, but the following configuration is similarly applied to a circular cross-section, an oval cross-section, and other various cross-sectional shapes. However, illustration and description of the details of the built-in power generation element and its connection fittings are omitted. The outer can 1 is closed with a lower bottom plate 1b, accommodates a power generation element 2 therein, and the upper end is closed with a sealing plate 1a, and a sealing plate 1a formed in a sealed shape is provided with an electrode portion (not shown). The circular holes 3 and 4 are provided, and a safety valve 5 is formed near one end thereof. The safety valve 5 forms an explosion-proof structure. In addition, 5F is an outer end surface of the sealing plate 1a (for example, refer FIG. 2).

安全弁５の拡大断面形状を図２に示す。図２の（ａ）図は図１の矢視IIａの部分断面図、（ｂ）図は矢視IIｂの部分断面図、（ｃ）図は安全弁５の部分拡大図である。この安全弁５は、安全弁の板素材の厚さＴから複数段のプレス加工処理がされて得られ、３つの加工形状の組み合わせから成る。第１加工凹部５ａは、薄板の封口板１ａの一端寄りの位置に安全弁５を形成するための安全弁用凹部として形成されている。   An enlarged cross-sectional shape of the safety valve 5 is shown in FIG. 2A is a partial cross-sectional view taken along the arrow IIa in FIG. 1, FIG. 2B is a partial cross-sectional view taken along the arrow IIb, and FIG. 2C is a partially enlarged view of the safety valve 5. The safety valve 5 is obtained by performing a plurality of stages of press processing from the thickness T of the plate material of the safety valve, and includes a combination of three processing shapes. The first processed recess 5a is formed as a safety valve recess for forming the safety valve 5 at a position near one end of the thin sealing plate 1a.

この安全弁用凹部である第１加工凹部５ａは、後述する図３の（ｂ）図に示すように、板素材の一部に第１残厚ｔ１を有する長円形の凹部を後述する第１プレス加工により形成したものであり、さらに第１プレス加工により残った第１残圧ｔ１に対し第２プレス加工により上記長円形の凹部外周辺に深さｄの波形の屈曲部を有しかつその屈曲部内周に第２残厚ｔ２の平板部を有する第２加工凹部５ｂが形成されている。また、上記第２加工凹部５ｂが形成された凹部の波形屈曲部より内周側に長円形状の小さな溝部５ｃが形成されている。この場合、溝部５ｃが形成された位置の第３残厚ｔ３はｔ２よりさらに薄い残厚となる。   As shown in FIG. 3B, which will be described later, the first processing recess 5a, which is a recess for the safety valve, is a first press that includes an oval recess having a first remaining thickness t1 in a part of the plate material. Further, the first residual pressure t1 remaining after the first press working is provided with a corrugated bent portion having a depth d on the outer periphery of the oval concave portion by the second press processing and the bent portion. A second processed recess 5b having a flat plate portion having a second remaining thickness t2 is formed on the inner periphery of the portion. Further, a small oval groove portion 5c is formed on the inner peripheral side from the corrugated bent portion of the concave portion in which the second processed concave portion 5b is formed. In this case, the third remaining thickness t3 at the position where the groove 5c is formed is a thinner remaining thickness than t2.

また、この溝部５ｃを形成することにより溝部５ｃより中心側の湾曲部５ｄは、図示のように、外側へ断面視凸の曲線状として形成される。そして、上記第２加工凹部５ｂと溝部５ｃとによりプレスベントが形成されることとなる。封口板１ａの板素材厚さＴは、例えば０．８〜１．０ｍｍとして設定され、他の残厚ｔ１、ｔ２、ｔ３については次のように設定されている。
ｔ１＝０．１〜０．０７ｍｍ
ｔ２＝０．０５〜０．０７ｍｍ
ｔ３＝０．０２０〜０．０３５ｍｍ（好ましくは０．０２３〜０．０２５ｍｍ） Further, by forming this groove portion 5c, the curved portion 5d closer to the center than the groove portion 5c is formed in a curved shape that is convex outward as shown in the figure. And a press vent will be formed of the said 2nd process recessed part 5b and the groove part 5c. The plate material thickness T of the sealing plate 1a is set as, for example, 0.8 to 1.0 mm, and the remaining thicknesses t1, t2, and t3 are set as follows.
t1 = 0.1-0.07mm
t2 = 0.05-0.07mm
t3 = 0.020-0.035 mm (preferably 0.023-0.025 mm)

上記のように、残厚ｔ１、ｔ２、ｔ３を設定した安全弁５は、安全弁５を形成する第２加工凹部５ｂの波形屈曲部及び屈曲部より中心側の板厚を全体に薄い板厚ｔ２としたため、全体としてプレスベントでありながら、クラッドベントのような柔軟性を確保している。そして、安全弁５の外周辺（長円形又は円形）には薄い残厚ｔ２の材料で波形屈曲部を形成しているため、柔軟性とベント耐力強度が大きくなり、又第３残厚ｔ３の薄肉部として設けた溝部５ｃにより中心側の湾曲部５ｄの内圧への関与を大きくしている。なお、第２加工凹部５ｂの波型屈曲部の深さｄは残厚ｔ１と板素材厚さＴの間の適当な値に設定している（二次電池の大きさ、種類によって異なる）。従って、安全弁５の防爆作用時には安全弁５のベント開放性が大きく向上している。その作用については後で説明する。   As described above, the safety valve 5 in which the remaining thicknesses t1, t2, and t3 are set has a plate thickness t2 that is thinner than the corrugated bent portion and the bent portion of the second processed recess 5b that forms the safety valve 5 as a whole. Therefore, while being a press vent as a whole, flexibility like a clad vent is secured. Since the corrugated bent portion is formed of the material having the thin remaining thickness t2 on the outer periphery (oval or circular) of the safety valve 5, the flexibility and the vent strength are increased, and the thin wall having the third remaining thickness t3 is provided. The groove portion 5c provided as a portion increases the involvement of the central curved portion 5d in the internal pressure. The depth d of the corrugated bent portion of the second processed recess 5b is set to an appropriate value between the remaining thickness t1 and the plate material thickness T (depending on the size and type of the secondary battery). Therefore, the vent opening of the safety valve 5 is greatly improved when the safety valve 5 is explosion-proof. The operation will be described later.

なお、外装缶１の素材はスチール製、封口板１ａはアルミニウム又はスチール製である。又、発電要素２は、この発明の特徴ではないため詳細な構成は図示省略しているが、例えば陰極としてリチウム金属板、陽極として硫化モリブデンなどを含む正極活性物質、電解液としてリチウムを含む有機溶媒が用いられたリチウム二次電池が用いられる。さらに、封口板１ａの中央部付近で図示しない電極部が突出しないように孔３の周辺が凹入状に形成されている。以上のように形成した安全弁を含むこの実施形態の二次電池Ａ１は、過度の充電等が行われて外装缶１内に内圧が生じた場合、安全弁５が安全な内圧の範囲で、かつ設定された防爆圧から僅かな誤差範囲内で確実に作動し、又電池を誤って落下させたときなどの衝撃があっても安全弁５が破壊されることはない。   The material of the outer can 1 is made of steel, and the sealing plate 1a is made of aluminum or steel. The power generating element 2 is not a feature of the present invention, and its detailed configuration is omitted. For example, a positive electrode active material including a lithium metal plate as a cathode, molybdenum sulfide as an anode, and an organic material including lithium as an electrolyte. A lithium secondary battery using a solvent is used. Furthermore, the periphery of the hole 3 is formed in a recessed shape so that an electrode portion (not shown) does not protrude near the central portion of the sealing plate 1a. In the secondary battery A1 of this embodiment including the safety valve formed as described above, when the internal pressure is generated in the outer can 1 due to excessive charging or the like, the safety valve 5 is set within a safe internal pressure range. The safety valve 5 is reliably operated within a slight error range from the explosion-proof pressure, and the safety valve 5 is not broken even if there is an impact such as when the battery is accidentally dropped.

上記構成の安全弁５の形成方法について図３Ａ、図３Ｂを参照して簡単に説明する。図３Ａ、図３Ｂは上記第１、第２加工凹部５ａ、５ｂ、溝部５ｃを形成する過程を示す。図３Ａの（ａ）図では封口板１ａの素材に対して安全弁５を設ける位置に第一加工凹部５ａの第１プレス加工が行われる。１０ａはプレス台、１１ａはプレスパンチである。封口板１ａの板素材の厚さはＴであり、これにプレスパンチ１１ａで第１加工凹部５ａの平板状の凹部をプレス成形する。この場合、プレスパンチは小径の第１プレスパンチ１１ａ、プレス台も小径の第１プレス台１０ａを用いている。第１加工凹部はこの例では図１に示す長円形状に形成される。   A method of forming the safety valve 5 having the above configuration will be briefly described with reference to FIGS. 3A and 3B. 3A and 3B show a process of forming the first and second processed recesses 5a and 5b and the groove 5c. In FIG. 3A (a), the 1st press work of the 1st process recessed part 5a is performed in the position which provides the safety valve 5 with respect to the raw material of the sealing board 1a. 10a is a press stand and 11a is a press punch. The thickness of the plate material of the sealing plate 1a is T, and the flat recess of the first processed recess 5a is press-molded by the press punch 11a. In this case, the press punch uses the first press punch 11a having a small diameter, and the press stand also uses the first press base 10a having a small diameter. In this example, the first processed recess is formed in an oval shape shown in FIG.

図３Ａの（ｂ）図では上記プレスパンチ１１ａよりさらにやや小径の第２プレスパンチ１１ｂ、第２プレス台１０ｂを用いて第２加工凹部５ｂのプレス加工を行う。この場合、図３Ａの（ｂ）図の（イ）と（ロ）に示すように、（イ）で加圧の初期に少しだけ加圧した時には未だ押圧面に大きな変化は生じていないが、（ロ）に示す段階まで加圧が進むと第２プレスパンチ１１ｂにより押圧されている面の厚さがｔ２となると共に、上記凹部の外周辺に断面視波形屈曲状の第２加工凹部５ｂが形成される。そして、この第２加工凹部５ｂも図１に示す長円形状に形成される。   In FIG. 3B, the second working recess 5b is pressed using the second press punch 11b and the second press table 10b, which are slightly smaller in diameter than the press punch 11a. In this case, as shown in (a) and (b) of FIG. 3A (b), when the pressure is slightly applied in the initial stage of pressurization in (a), there is still no significant change in the pressing surface. When the pressurization proceeds to the stage shown in (b), the thickness of the surface pressed by the second press punch 11b becomes t2, and the second processed recess 5b having a waveform-like shape in cross section is formed on the outer periphery of the recess. It is formed. And this 2nd process recessed part 5b is also formed in the ellipse shape shown in FIG.

さらに、図３Ｂの（ｃ）図では、第２プレスパンチ１１ｂよりさらに少しだけ小径の第３プレスパンチ１１ｃにより溝部５ｃが形成される。この場合、第２加工凹部５ｂの底部の外径より少しだけ径の大きいプレス台１０ｃを用いる。又、第３プレスパンチ１１ｃは、図示のように下端が平面状ではなく、カップ状の突出縁部を有し、かつその下端に断面視凹状の突出加工端を有する。そして、この第３プレスパンチ１１ｃでプレス加工することにより対応する位置の残厚素材には溝部５ｃが形成される。又、この溝部５ｃの形成と共に溝部より内周辺は図示のように外に凸の湾曲状に膨出した湾曲部５ｄとして形成される。   Further, in FIG. 3B (c), the groove portion 5c is formed by the third press punch 11c having a slightly smaller diameter than the second press punch 11b. In this case, the press stand 10c having a slightly larger diameter than the outer diameter of the bottom of the second processed recess 5b is used. Further, as shown in the drawing, the third press punch 11c has a cup-shaped protruding edge portion at the lower end, not a flat shape, and a protruding processing end having a concave shape in cross section at the lower end. And the groove part 5c is formed in the remaining thickness raw material of a corresponding position by pressing with this 3rd press punch 11c. Further, along with the formation of the groove portion 5c, the inner periphery of the groove portion is formed as a curved portion 5d bulging outwardly in a convex curved shape as shown in the figure.

これは、溝部５ｃを形成する際のプレス圧で湾曲部５ｄが第３プレス台１０ｃから特別な作用を加えることなく膨出状に変形するからである。溝部５ｃへのプレス加圧で押された素材が内向きに変形して膨出するものと考えられている。なお、この溝部５ｃや湾曲部５ｄの形状も長円形である。   This is because the bending portion 5d is deformed into a bulging shape from the third press table 10c without applying a special action due to the pressing pressure when forming the groove portion 5c. It is considered that the material pressed by pressurizing the groove 5c is deformed inward and bulges. In addition, the shape of this groove part 5c and the curved part 5d is also oval.

以上のようなプレス加工処理を経て形成された安全弁５によれば、大気圧より大きい所定の防爆圧以上の内圧が作用しても安全に作動する。即ち、この二次電池Ａ１に異状な大電流の充電などが行われて外装缶１内に防爆圧以上の内圧が生じても所定の内圧で確実に安全に作動し、かつ構造強度が十分なものが得られる。所定の内圧は、この例では７〜１５ｋｇｆ／ｃｍ2 に設定される。これは、従来の特許文献１のように数ｋｇｆ／ｃｍ2 のように低い内圧に設定しても、それはあくまで理論上の設定であり、実際には安全弁として作用する前に外装缶が先に変形して安全弁としての作用が遅れ安全弁として確実に作用せず、又二次電池Ａ１を不用意に落したような場合には耐衝撃性が低くなるからである。 According to the safety valve 5 formed through the press working process as described above, it operates safely even when an internal pressure greater than a predetermined explosion-proof pressure greater than atmospheric pressure acts. In other words, even if an abnormal large current is charged in the secondary battery A1 and an internal pressure higher than the explosion-proof pressure is generated in the outer can 1, it operates safely at a predetermined internal pressure and has a sufficient structural strength. Things are obtained. The predetermined internal pressure is set to 7 to 15 kgf / cm 2 in this example. This is a theoretical setting even if the internal pressure is set to a low value such as several kgf / cm 2 as in the conventional patent document 1, and the outer can is actually first before acting as a safety valve. This is because when the secondary battery A1 is inadvertently dropped, the impact resistance is lowered if the deformation causes a delay in the action as a safety valve and no reliable action.

即ち、特許文献１の安全弁では所定の防爆圧以上の内圧が作用した時、安全弁が作動する前にまず内圧のエネルギで電池の外装缶が大きく変形し、その後安全弁の一部が少しだけ切裂して残圧が排出される。従って、安全弁がまず先に作動して外装缶の変形を生じない状態で一気に内圧を排出するという安全弁本来の作動が得られない。これに対して、この実施形態の二次電池Ａ１は、波形屈曲形状の第２加工凹部５ｂを有するため、第２加工凹部５ｂの強度が波形形状部の弾性強度の向上により増大しており、さらにこの第２加工凹部の基部より内周の平板外側面にプレス成形された溝部５ｃを有する。   That is, in the safety valve of Patent Document 1, when an internal pressure exceeding a predetermined explosion-proof pressure is applied, the battery outer can is first largely deformed by the energy of the internal pressure before the safety valve is activated, and then a part of the safety valve is slightly broken. Residual pressure is discharged. Therefore, the original operation of the safety valve, in which the internal pressure is discharged at once without the deformation of the outer can by first operating the safety valve, cannot be obtained. On the other hand, since the secondary battery A1 of this embodiment has the waveform-shaped second processed recess 5b, the strength of the second processed recess 5b is increased by improving the elastic strength of the waveform-shaped portion, Furthermore, it has the groove part 5c press-molded in the outer peripheral flat plate outer surface from the base part of this 2nd process recessed part.

このため、所定の防爆圧以上の内圧が作用した時まずこの溝部から内側の湾曲部５ｄの部分が溝部を境にして一気に切裂し、安全弁として機能する。従って、外装缶１に大きな変形が生じることなく安全弁５が安全に、かつ確実に作用してこの二次電池Ａ１が搭載される機器へ不測の損傷を与えるなどの事故を防止することとなる。この場合、溝部５ｃは、端板である封口板１ａに単体で試験圧を掛けて作動する圧力と二次電池に封口板１ａを装着した状態で二次電池Ａ１が発生する内圧とがほぼ一致した状態で作動し、従来の二次電池のように端板単体での試験圧と二次電池に装着した状態では防爆圧が試験圧と大きく異なるということはなく、従って二次電池に発生する内圧で外装缶１が大きく変形しない範囲内で設定される設定圧に一致する作動圧で溝部５ｃが切裂し、安全弁として確実に作動する。   For this reason, when an internal pressure equal to or higher than a predetermined explosion-proof pressure is applied, the portion of the curved portion 5d on the inner side from this groove is first cut at a stretch from the groove and functions as a safety valve. Therefore, it is possible to prevent accidents such as unexpected damage to the device on which the secondary battery A1 is mounted by the safety valve 5 acting safely and reliably without causing major deformation of the outer can 1. In this case, in the groove portion 5c, the pressure at which the test plate is applied to the sealing plate 1a as an end plate and the internal pressure generated by the secondary battery A1 when the sealing plate 1a is attached to the secondary battery is substantially the same. The explosion-proof pressure does not differ greatly from the test pressure when the test pressure of the end plate alone and the secondary battery are attached as in the case of a conventional secondary battery. The groove 5c is torn at an operating pressure that matches a set pressure set within a range in which the outer can 1 is not greatly deformed by the internal pressure, and operates reliably as a safety valve.

図４、図５に第２実施形態の二次電池Ａ２の要部断面図、及びプレス加工方法の説明図を示す。図４の（ａ）図に示すように、この実施形態では安全弁５’の構成は第１実施形態の安全弁と基本的には同じであるが、第２加工凹部５ｂの内周側に形成される溝部５ｃ’が湾曲部５ｄ’の内側に設けられている点で第１実施形態の二次電池Ａ１と部分的に異なる。又湾曲部５ｄ’の内周側が平板上であり外に凸状でない点も少し異なっている。これは、後で図５に基づいて説明するように、そのプレス加工方法が異なるからである。その他の基本的な構成は同じであるから、以下では主としてその異なる構成部について説明し、同じ構成部分については第１実施形態の構成をそのまま適用するものとして説明を省略する。   4 and 5 show a cross-sectional view of the main part of the secondary battery A2 of the second embodiment and an explanatory view of the pressing method. As shown in FIG. 4A, in this embodiment, the configuration of the safety valve 5 ′ is basically the same as that of the first embodiment, but is formed on the inner peripheral side of the second machining recess 5b. The groove 5c ′ is partially different from the secondary battery A1 of the first embodiment in that the groove 5c ′ is provided inside the curved portion 5d ′. Another difference is that the inner peripheral side of the curved portion 5d 'is a flat plate and is not convex outward. This is because the pressing method is different, as will be described later with reference to FIG. Since the other basic configurations are the same, the following mainly describes the different components, and the description of the same components is omitted because the configuration of the first embodiment is applied as it is.

図４に、第１、第２加工凹部５ａ、５ｂは第１実施形態と同様であるが、溝部５ｃ’と湾曲部５ｄ’が異なることが示されている。即ち、第２加工凹部５ｂの内周基部よりさらに内周側に湾曲部５ｄ’に対して外に凸の溝部から成る溝部５ｃ’が形成されており、又湾曲部５ｄ’は平板状のままである。但し、図５に示すように、この例では溝部５ｃ’を加工する際に、上記溝部に対応する突起部をプレス台１０ｃ’に設けており、プレスパンチ１１ｃ’の下底面はフラットである。   FIG. 4 shows that the first and second processed recesses 5a and 5b are the same as in the first embodiment, but the groove 5c 'and the curved portion 5d' are different. That is, a groove portion 5c ′ composed of a groove portion protruding outward from the curved portion 5d ′ is formed further on the inner circumferential side than the inner circumferential base portion of the second processed concave portion 5b, and the curved portion 5d ′ remains flat. It is. However, as shown in FIG. 5, in this example, when the groove 5c 'is processed, a protrusion corresponding to the groove is provided on the press table 10c', and the bottom surface of the press punch 11c 'is flat.

上記構成の二次電池Ａ２の封口板１ａのプレス加工方法も、基本的には第１実施形態と同じであり、上述したように、プレス台１０’とプレスパンチ１１ｃ’の形状が異なるだけである。溝部５ｃと５ｃ’とは形成される方向が異なるが、湾曲部５ｄ’の外周に残される板厚ｔ３は同じである。なお、上記２つの実施形態では、安全弁５は封口板１ａに設けるとして説明したが、反対に外装缶１の下底板１ｂに設けてもよい。又、第２実施形態のように、湾曲部５ｄ’は必ずしも第１実施形態のように湾曲形状でなくとも、図示のように平板状であってもよいし、あるいは湾曲状としてもよい。   The pressing method of the sealing plate 1a of the secondary battery A2 having the above configuration is basically the same as that of the first embodiment, and only the shapes of the press table 10 ′ and the press punch 11c ′ are different as described above. is there. Although the groove portions 5c and 5c 'are formed in different directions, the plate thickness t3 remaining on the outer periphery of the curved portion 5d' is the same. In the above-described two embodiments, the safety valve 5 has been described as being provided on the sealing plate 1a, but may be provided on the lower bottom plate 1b of the outer can 1 on the contrary. Further, as in the second embodiment, the curved portion 5d 'is not necessarily curved as in the first embodiment, but may be flat as shown in the figure, or may be curved.

この発明の二次電池は、所定の防爆圧以上の内圧で確実に作動するプレスベント形式の安全弁を設けたから、リチウム電池のような有機電解液電池（非水電解質電池）等に広く利用される。   Since the secondary battery of the present invention is provided with a press vent type safety valve that operates reliably at an internal pressure equal to or higher than a predetermined explosion-proof pressure, it is widely used for an organic electrolyte battery (non-aqueous electrolyte battery) such as a lithium battery. .

第１実施形態の二次電池の外観斜視図External perspective view of the secondary battery of the first embodiment （ａ）図１の矢視IIａの部分断面図、（ｂ）図１の矢視IIｂの部分断面図、（ｃ）安全弁の部分拡大断面図(A) Partial sectional view of arrow IIa in FIG. 1, (b) Partial sectional view of arrow IIb in FIG. 1, (c) Partial enlarged sectional view of a safety valve （ａ）第１プレス加工の説明図、（ｂ）第２プレス加工の説明図(A) Explanatory drawing of 1st press work, (b) Explanatory drawing of 2nd press work （ｃ）第３プレス加工の説明図(C) Explanatory drawing of third press working 第２実施形態の二次電池の（ａ）図１の矢視IIａに対応する部分断面図、（ｂ）図１の矢視IIｂに対応する部分断面図(A) Partial sectional view corresponding to the arrow IIa in FIG. 1 of the secondary battery of the second embodiment, (b) Partial sectional view corresponding to the arrow IIb in FIG. 同上の二次電池の（ｃ）第２プレス加工の説明図、（ｄ）第３プレス加工の説明図(C) Explanatory drawing of 2nd press work of a secondary battery same as the above, (d) Explanatory drawing of 3rd press work

符号の説明Explanation of symbols

１ 外装缶
１ａ 封口板
１ｂ 下底板
２ 発電要素
３、４ 円形の孔
５ 安全弁
５ａ 第１加工凹部
５ｂ 第２加工凹部
５ｃ 溝部
５ｄ 湾曲部
１０ａ 第１プレス台
１１ａ 第１プレスパンチ
１１ｂ 第２プレスパンチ
１１ｃ 第３プレスパンチ DESCRIPTION OF SYMBOLS 1 Exterior can 1a Sealing plate 1b Lower base plate 2 Power generation element 3, 4 Circular hole 5 Safety valve 5a 1st processing recessed part 5b 2nd processing recessed part 5c Groove part 5d Curved part 10a 1st press stand 11a 1st press punch 11b 2nd press punch 11c 3rd press punch

Claims (3)

発電要素２を内蔵し、電池外装缶１の端板に内圧で作動する安全弁５を設けた二次電池において、安全弁５を設ける上記端板の板素材の所定位置に第１残厚ｔ１を有する安全弁用凹部５ａを設け、安全弁用凹部５ａ内にさらに薄い第２残厚ｔ２を有しかつ外周辺に波形屈曲部を有する長円形の加工凹部５ｂを設け、この加工凹部５ｂの前記波形屈曲部より内周寄り位置に前記第２残厚ｔ２よりさらに薄い第３残厚ｔ３を有する長円形の溝部５ｃを形成し、この溝部５ｃより中心側に断面視凸曲線状の湾曲部５ｄを形成し、所定の防爆圧以上の内圧発生時に溝部５ｃを切裂させて内圧を逃がすことにより安全弁５を作動させるように構成した二次電池の防爆構造。 In a secondary battery that includes a power generation element 2 and that is provided with a safety valve 5 that operates at an internal pressure on an end plate of the battery outer can 1, the first remaining thickness t1 is provided at a predetermined position of the plate material of the end plate provided with the safety valve 5. the safety valve recesses 5a provided, having a second remaining thickness t2 thinner in the safety valve recess 5a and an oblong processing recess 5b having a waveform bent portion on the outer periphery provided, the waveform bent portion of the processing recess 5b An oval groove portion 5c having a third remaining thickness t3 that is thinner than the second remaining thickness t2 is formed at a position closer to the inner periphery, and a curved portion 5d having a convex curve shape in cross section is formed on the center side of the groove portion 5c. , configured secondary batteries of explosion-proof structure so as to actuate the safety valve 5 by releasing the pressure by Setsu裂a groove 5c at a predetermined proof爆圧more pressure generation. 前記溝部５ｃを、第２残厚ｔ２を有する加工凹部５ｂの外面又は内面のいずれかに設けたことを特徴とする請求項１に記載の二次電池の防爆構造。   2. The explosion-proof structure for a secondary battery according to claim 1, wherein the groove portion 5 c is provided on either the outer surface or the inner surface of the processing recess 5 b having the second remaining thickness t <b> 2. 前記安全弁５を電池外装缶１の上端部の封口板１ａ又は下底板１ｂに設けたことを特徴とする請求項１または２に記載の二次電池の防爆構造。
The explosion-proof structure for a secondary battery according to claim 1 or 2, wherein the safety valve (5) is provided on a sealing plate (1a) or a lower bottom plate (1b) at the upper end of the battery outer can (1).
JP2005330349A 2005-11-15 2005-11-15 Explosion-proof structure of secondary battery Expired - Fee Related JP4468290B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005330349A JP4468290B2 (en) 2005-11-15 2005-11-15 Explosion-proof structure of secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005330349A JP4468290B2 (en) 2005-11-15 2005-11-15 Explosion-proof structure of secondary battery

Publications (2)

Publication Number Publication Date
JP2007141518A JP2007141518A (en) 2007-06-07
JP4468290B2 true JP4468290B2 (en) 2010-05-26

Family

ID=38204157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005330349A Expired - Fee Related JP4468290B2 (en) 2005-11-15 2005-11-15 Explosion-proof structure of secondary battery

Country Status (1)

Country Link
JP (1) JP4468290B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11482757B2 (en) 2016-09-06 2022-10-25 Samsung Sdi Co., Ltd. Rechargeable battery

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100927296B1 (en) 2007-05-28 2009-11-18 파나소닉 주식회사 Organic EL Devices and Displays
JP5503101B2 (en) * 2007-06-22 2014-05-28 株式会社神戸製鋼所 Battery case
CN102208677A (en) * 2010-03-29 2011-10-05 深圳市比克电池有限公司 Pressure release device and assembly of secondary lithium ion battery and cell cover
JP5237341B2 (en) * 2010-09-24 2013-07-17 日新製鋼株式会社 Battery safety valve
JP5596647B2 (en) * 2010-10-13 2014-09-24 株式会社ソーデナガノ Battery case lid manufacturing method
JP5276685B2 (en) 2011-03-31 2013-08-28 日新製鋼株式会社 Battery case lid manufacturing method
JP5250138B2 (en) * 2011-08-09 2013-07-31 日新製鋼株式会社 Battery case lid
US9634299B2 (en) 2011-09-06 2017-04-25 Samsung Sdi Co., Ltd. Rechargeable battery
KR101683210B1 (en) * 2011-11-17 2016-12-07 삼성에스디아이 주식회사 Rechargeable battery
CN105074960B (en) * 2013-04-16 2018-01-09 株式会社早出长野 Battery container
KR102232530B1 (en) * 2014-08-11 2021-03-26 삼성에스디아이 주식회사 Rechargeable battery
CN106711520A (en) * 2015-07-20 2017-05-24 东莞力朗电池科技有限公司 Extrusion protection manner for cylindrical lithium ion battery
CN108847500B (en) * 2018-05-11 2021-08-06 南阳市龙润装备制造有限公司 Preparation method of battery explosion-proof sheet
JP2019200888A (en) * 2018-05-15 2019-11-21 Smk株式会社 Explosion-proof valve, explosion-proof valve unit, manufacturing method of the explosion-proof valve, and manufacturing method of the explosion-proof valve unit
CN109746318B (en) * 2019-01-22 2020-08-21 浙江锦泰电子有限公司 Method for manufacturing explosion-proof sheet
CN110061173A (en) * 2019-05-21 2019-07-26 惠州亿纬锂能股份有限公司 A kind of explosion-proof valve block and preparation method thereof, the battery comprising this explosion-proof valve block
CN112448097B (en) * 2019-09-04 2022-11-04 东莞新能源科技有限公司 Explosion-proof valve and battery pack
CN111916615A (en) * 2020-07-15 2020-11-10 江苏阿李动力科技有限公司 Power battery explosion-proof valve structure and processing technology thereof
CN112310554B (en) * 2020-11-18 2022-03-29 广东至力科技有限公司 Explosion-proof structure of miniature lithium ion battery
EP4145612A4 (en) * 2021-07-21 2023-08-30 Contemporary Amperex Technology Co., Limited Battery cell and manufacturing method and manufacturing system therefor, battery, and electrical device
KR102368696B1 (en) * 2021-08-09 2022-02-28 주식회사 파인디앤씨 A cap-plate with one-piece vent for secondary battery and secondary battery used it
KR102406193B1 (en) * 2021-08-18 2022-06-10 주식회사 파인디앤씨 Cap plate for secondary batteries having vent structure, and manufacturing mathod of the cap plate
EP4187660A4 (en) * 2021-09-29 2023-11-29 Contemporary Amperex Technology Co., Limited Pressure relief mechanism, battery cell, battery, electrical device and manufacturing method therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11482757B2 (en) 2016-09-06 2022-10-25 Samsung Sdi Co., Ltd. Rechargeable battery

Also Published As

Publication number Publication date
JP2007141518A (en) 2007-06-07

Similar Documents

Publication Publication Date Title
JP4468290B2 (en) Explosion-proof structure of secondary battery
JP4605823B1 (en) Sealed battery safety valve and sealed battery using the same
US9853266B2 (en) Vent and cap assembly of power battery
EP1458038B1 (en) Explosion-proof seal plate for sealed type cell and production method thereof
JP2006286561A (en) Sealing plate for sealed battery
JP5204973B2 (en) Safety valve structure for secondary battery and manufacturing method thereof
JP4692985B2 (en) Sealed prismatic battery
WO2003007401A1 (en) Battery
JP2011018645A (en) Secondary battery
JP2008066255A (en) Nonaqueous electrolyte secondary battery
EP1519428A3 (en) Lithium Secondary Battery with high safety and manufacturing method thereof
JPWO2016104734A1 (en) Electricity storage element
JP3655644B2 (en) Explosion-proof valve group and sealed secondary battery using the same
JP2000082457A (en) Electric/electronic equipment and part safeguard, sealed battery safeguard using it and sealed battery using it
JP2009266714A (en) Safety device
JP4121130B2 (en) Sealed battery
JP2014197463A (en) Battery
CN110800132B (en) Cylindrical battery
JP4622271B2 (en) battery
JP2001023596A (en) Explosion-proof construction of secondary battery
JPH10247483A (en) Safety structure of sealed battery
WO2015079672A1 (en) Cylindrical battery
JP2008262744A (en) Sealed battery
KR20160015778A (en) A sylnder type battery having enhanced vibration resistant property
JP2018200826A (en) Cylindrical battery

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20081222

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20091020

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20091218

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100126

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100224

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130305

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140305

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees