JP2006155971A - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
JP2006155971A
JP2006155971A JP2004341447A JP2004341447A JP2006155971A JP 2006155971 A JP2006155971 A JP 2006155971A JP 2004341447 A JP2004341447 A JP 2004341447A JP 2004341447 A JP2004341447 A JP 2004341447A JP 2006155971 A JP2006155971 A JP 2006155971A
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Prior art keywords
battery
secondary battery
safety valve
marking display
thin
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JP2004341447A
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JP4757481B2 (en
Inventor
Hidemasa Kawai
英正 河合
Masahiro Takano
正弘 高野
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Tokin Corp
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NEC Tokin Tochigi Ltd
NEC Tokin Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly safe secondary battery surely performing discharge of an internal pressure of the battery by a simple structure. <P>SOLUTION: An engraved display part 2 is arranged on the surface of a battery can 1, and a thin part formed along at least a part of the engraved display part 2 in the engraved display part 2 functions as a safety valve for discharging an internal pressure of the battery. When thickness of the battery can itself is 100 %, thickness of the battery can is 1-30% in the engraved display part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、携帯機器、情報機器、家電機器等への使用に好適な二次電池に関し、特に安全弁の形成に関する。   The present invention relates to a secondary battery suitable for use in portable devices, information devices, home appliances, and the like, and more particularly to formation of a safety valve.

図２は、従来の二次電池における安全弁を形成した状態の説明図であり、図２（ａ）は上面図、図２（ｂ）は、図２（ａ）のＢＢ断面図である。電池ケースの端面の璧に、安全弁４１が、配置された構造である。前記安全弁４１が電池内部の圧力が、規定以上に上昇した場合、前記安全弁４１が作動して、前記圧力を逃がす作用を行う。   2A and 2B are explanatory views of a state in which a safety valve is formed in a conventional secondary battery. FIG. 2A is a top view, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. The safety valve 41 is arranged on the wall of the end surface of the battery case. When the pressure inside the battery rises above a specified level, the safety valve 41 operates to release the pressure.

図３は、従来の他の例での二次電池における、安全弁を形成した状態の説明図である。ここで、図３は、特許文献１に記載されている図面であって、電池ケースの側璧に、厚さの薄い溝部４６が形成されたものである。ここで、前記溝部４６が、電池内部の圧力が、規定以上に上昇した場合、破断されて、前記圧力を、逃がす作用を行うものである。   FIG. 3 is an explanatory diagram of a state in which a safety valve is formed in a secondary battery in another conventional example. Here, FIG. 3 is a drawing described in Patent Document 1, in which a thin groove 46 is formed on the side wall of the battery case. Here, when the pressure inside the battery rises above a specified level, the groove 46 is broken to perform the action of releasing the pressure.

特開平２００１−３５４６７号公報Japanese Patent Laid-Open No. 2001-35467

従来の二次電池には、以下の問題点があった。図２の場合には、安全弁４１を設置する必要があり、安全弁４１の価格が、二次電池の価格にふくまれるので、価格が高くなるという問題点があった。   The conventional secondary battery has the following problems. In the case of FIG. 2, it is necessary to install the safety valve 41, and the price of the safety valve 41 is included in the price of the secondary battery.

また、図３の場合は、電池ケースの側璧４２ａに、プレスによって厚さの薄い溝部４６を形成するが、新たに前記溝部４６を加工するための作業工数と、専用の設備を要するという問題点があった。   In the case of FIG. 3, a thin groove portion 46 is formed by pressing on the side wall 42 a of the battery case. However, a work man-hour for newly processing the groove portion 46 and dedicated equipment are required. There was a point.

本発明の課題は、簡易的な構造にて、電池の内圧の放出が確実に行われる安全弁としての機能を持たせた信頼性の高い二次電池を提供することである。   An object of the present invention is to provide a highly reliable secondary battery having a simple structure and having a function as a safety valve that reliably releases the internal pressure of the battery.

本発明の二次電池は、レーザ装置によって、電池缶表面に刻印表示部を形成するのと同時に、前記刻印表示部にて形成される薄肉部の厚みを制御して、電池の内圧を放出するための安全弁としての機能を持たせたものである。   The secondary battery according to the present invention releases the internal pressure of the battery by controlling the thickness of the thin portion formed in the marking display portion at the same time as the marking display portion is formed on the surface of the battery can by the laser device. Therefore, it has a function as a safety valve.

即ち、本発明は、電池缶表面に刻印表示部が設けられ、前記刻印表示部の少なくとも一部の刻印表示部に沿って形成された薄肉部が、電池の内圧を放出するための安全弁の機能を持つ二次電池である。   That is, the present invention provides a function of a safety valve in which a marking display part is provided on the surface of the battery can, and a thin part formed along at least a part of the marking display part of the marking display part releases the internal pressure of the battery. Secondary battery with

また、本発明は、前記刻印表示部が形成された薄肉部の厚みは、缶自体の肉厚を１００％とした時、１％以上から３０％以下の範囲である二次電池である。   Further, the present invention provides the secondary battery in which the thickness of the thin portion where the marking display portion is formed is in the range of 1% to 30% when the thickness of the can itself is 100%.

また、本発明は、前記刻印表示部および前記薄肉部は、レーザ装置によるレーザ加工によって形成された二次電池である。   Moreover, this invention is a secondary battery in which the said marking display part and the said thin part are formed by the laser processing by a laser apparatus.

また、本発明は、非水電解液二次電池の二次電池である。   Moreover, this invention is a secondary battery of a nonaqueous electrolyte secondary battery.

また、本発明は、リチウム二次電池の二次電池である。   Moreover, this invention is a secondary battery of a lithium secondary battery.

本発明によれば、簡易的な構造にて、電池の内圧の放出が確実に行われる安全弁としての機能を持たせた信頼性の高い二次電池を提供できる。   According to the present invention, it is possible to provide a highly reliable secondary battery having a function as a safety valve with a simple structure that reliably releases the internal pressure of the battery.

本発明の実施の形態による二次電池について、以下に説明する。本発明の二次電池は、レーザ装置によって電池缶表面に刻印表示部を形成する時と同時に、前記刻印表示部の少なくとも一部の刻印表示部に沿って形成された薄肉部が、電池の内圧を放出するための安全弁としての機能を持つ二次電池である。   The secondary battery according to the embodiment of the present invention will be described below. The secondary battery of the present invention has a thin wall portion formed along at least a part of the marking display part of the marking display part at the same time when the marking display part is formed on the surface of the battery can by the laser device. It is a secondary battery that functions as a safety valve for discharging the battery.

また、本発明は、前記少なくとも一部の刻印表示部にて形成された薄肉部の厚みは、缶自体の肉厚を１００％とした時、１％以上から３０％以下の範囲である二次電池である。ここで、厚みが１％未満であると安全弁としての感度が高くなり過ぎ、また厚みが３０％を越えると安全弁としての感度が低下する。   In the present invention, the thickness of the thin portion formed in the at least part of the marking display portion is in the range of 1% to 30% when the thickness of the can itself is 100%. It is a battery. Here, if the thickness is less than 1%, the sensitivity as a safety valve becomes too high, and if the thickness exceeds 30%, the sensitivity as a safety valve decreases.

なお、前記刻印表示部は、例えばレーザ装置によるレーザ加工によって形成される。また、電池缶の材質は、一般にアルミニウム、あるいはアルミニウム合金、マグネシウム合金などが使用される。また、本発明の二次電池の薄肉部は、電池全体の小型化に対して最適であり、特に最近小型化が求められているリチウムイオン二次電池に適する。   In addition, the said marking display part is formed by the laser processing by a laser apparatus, for example. In general, the material of the battery can is aluminum, an aluminum alloy, a magnesium alloy, or the like. In addition, the thin portion of the secondary battery of the present invention is optimal for downsizing the entire battery, and is particularly suitable for a lithium ion secondary battery for which downsizing is recently required.

図１は、本発明の実施例の二次電池における安全弁機能部を形成した状態の説明図である。ここで、本発明の二次電池は、リチウムイオン二次電池である。図１（ａ）は上面図であり、図１（ｂ）は、図１（ａ）のＡＡ断面図である。   FIG. 1 is an explanatory diagram of a state where a safety valve function unit is formed in a secondary battery according to an embodiment of the present invention. Here, the secondary battery of the present invention is a lithium ion secondary battery. FIG. 1A is a top view, and FIG. 1B is a cross-sectional view taken along line AA in FIG.

図１において、１は電池缶であり、材質をアルミニウムとした。また、２は刻印表示部であり、また４は、前記刻印表示部の中の一部の文字に沿って構成された薄肉部である。３は電極である。   In FIG. 1, 1 is a battery can and the material was aluminum. Reference numeral 2 denotes a marking display section, and reference numeral 4 denotes a thin-walled section configured along some characters in the marking display section. 3 is an electrode.

電池缶１自体の肉厚を１００％とした時、前記薄肉部４の厚みは１０％とし、その他の部分の刻印表示部２の厚みは８０％とした。ここで、電池缶自体の厚みは、０．５ｍｍである。   When the thickness of the battery can 1 itself was 100%, the thickness of the thin portion 4 was 10%, and the thickness of the stamped display portion 2 in other portions was 80%. Here, the thickness of the battery can itself is 0.5 mm.

ここで、前記薄肉部４の機能は、電池内部の内圧が上昇した場合、ある所定値の圧力以上において破断して圧力を逃す機能を持つ。   Here, the function of the thin-walled portion 4 has a function of breaking and releasing the pressure when the internal pressure of the battery rises above a predetermined value.

なお、前記刻印表示部２と薄肉部４とは、同じレーザ装置によるレーザ加工によって形成されるが、各々、場所をパラメータとしてレーザ加工時間の条件を変えて薄肉部と刻印表示部とを形成する。このような設備の条件設定によって対応するので、製造コストを軽減できる効果がある。   The marking display section 2 and the thin-walled section 4 are formed by laser processing using the same laser device, but the thin-walled section and the marking display section are formed by changing the conditions of the laser processing time using the location as a parameter. . Since it respond | corresponds by the condition setting of such an installation, there exists an effect which can reduce manufacturing cost.

本発明の実施例の二次電池における、安全弁機能部を形成した状態の説明図。図１（ａ）は上面図、図１（ｂ）は、図１（ａ）のＡＡ断面図。Explanatory drawing of the state which formed the safety valve function part in the secondary battery of the Example of this invention. FIG. 1A is a top view, and FIG. 1B is a cross-sectional view taken along line AA in FIG. 従来の二次電池における安全弁を形成した状態の説明図。図２（ａ）は上面図、図２（ｂ）は、図２（ａ）のＢＢ断面図。Explanatory drawing of the state which formed the safety valve in the conventional secondary battery. 2A is a top view, and FIG. 2B is a BB cross-sectional view of FIG. 従来の他の例の二次電池における安全弁を形成した状態の説明図。Explanatory drawing of the state which formed the safety valve in the secondary battery of the other conventional example.

符号の説明Explanation of symbols

１ 電池缶
２ 刻印表示部
３，３１ 電極
４ 薄肉部
４１ 安全弁
４２ａ，４２ｂ 側壁
４６ 溝部 1 Battery can
2 Marking display part 3, 31 Electrode 4 Thin part 41 Safety valve
42a, 42b Side wall 46 Groove

Claims (5)

電池缶表面に刻印表示部が設けられ、前記刻印表示部の少なくとも一部の刻印表示部に沿って形成された薄肉部が、電池の内圧を放出するための安全弁の機能を持つことを特徴とする二次電池。   A marking display part is provided on the surface of the battery can, and a thin part formed along at least a part of the marking display part of the marking display part has a function of a safety valve for releasing the internal pressure of the battery. Secondary battery. 前記刻印表示部が形成された薄肉部の厚みは、缶自体の肉厚を１００％とした時、１％以上から３０％以下の範囲であることを特徴とする請求項１に記載の二次電池。   2. The secondary according to claim 1, wherein the thickness of the thin-walled portion on which the marking display portion is formed is in the range of 1% to 30% when the thickness of the can itself is 100%. battery. 前記刻印表示部および前記薄肉部は、レーザ加工によって形成されたことを特徴とする請求項１または２のいずれかに記載の二次電池。   The secondary battery according to claim 1, wherein the marking display portion and the thin portion are formed by laser processing. 請求項１ないし３のいずれかに記載の二次電池は、非水電解液二次電池であることを特徴とする二次電池。   The secondary battery according to any one of claims 1 to 3, wherein the secondary battery is a non-aqueous electrolyte secondary battery. 請求項４記載の二次電池は、リチウム二次電池であることを特徴とする二次電池。   The secondary battery according to claim 4 is a lithium secondary battery.
JP2004341447A 2004-11-26 2004-11-26 Secondary battery Expired - Fee Related JP4757481B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101347715B1 (en) 2011-02-21 2014-01-03 주식회사 엘지화학 Prismatic Secondary Battery Employed with Safety Plate
WO2014203344A1 (en) * 2013-06-19 2014-12-24 日立オートモティブシステムズ株式会社 Rectangular-prism-shaped secondary battery

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019053169A (en) * 2017-09-14 2019-04-04 日東電工株式会社 Polarizer, manufacturing method of polarizer and optical laminate including the polarizer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529084A (en) * 1978-05-29 1980-03-01 Pumpen & Verdichter Veb K Highhpressure volute pump
JPH01309252A (en) * 1988-06-07 1989-12-13 Asahi Chem Ind Co Ltd Seald battery
JPH08115710A (en) * 1994-10-14 1996-05-07 Hitachi Maxell Ltd Flat type battery
JP2000113864A (en) * 1998-10-06 2000-04-21 Toshiba Battery Co Ltd Flat nonaqueous electrolyte battery
JP2000299089A (en) * 1999-04-13 2000-10-24 Toshiba Battery Co Ltd Square alkaline secondary battery and its manufacture

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529084A (en) * 1978-05-29 1980-03-01 Pumpen & Verdichter Veb K Highhpressure volute pump
JPH01309252A (en) * 1988-06-07 1989-12-13 Asahi Chem Ind Co Ltd Seald battery
JPH08115710A (en) * 1994-10-14 1996-05-07 Hitachi Maxell Ltd Flat type battery
JP2000113864A (en) * 1998-10-06 2000-04-21 Toshiba Battery Co Ltd Flat nonaqueous electrolyte battery
JP2000299089A (en) * 1999-04-13 2000-10-24 Toshiba Battery Co Ltd Square alkaline secondary battery and its manufacture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101347715B1 (en) 2011-02-21 2014-01-03 주식회사 엘지화학 Prismatic Secondary Battery Employed with Safety Plate
WO2014203344A1 (en) * 2013-06-19 2014-12-24 日立オートモティブシステムズ株式会社 Rectangular-prism-shaped secondary battery

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