JP2005276579A - Flat square battery - Google Patents

Flat square battery Download PDF

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JP2005276579A
JP2005276579A JP2004086778A JP2004086778A JP2005276579A JP 2005276579 A JP2005276579 A JP 2005276579A JP 2004086778 A JP2004086778 A JP 2004086778A JP 2004086778 A JP2004086778 A JP 2004086778A JP 2005276579 A JP2005276579 A JP 2005276579A
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positive electrode
battery
side wall
peripheral side
flat rectangular
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Hirokazu Yoshikawa
博和 吉川
Hideto Itano
秀人 板野
Tetsuo Kawai
徹夫 川合
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Maxell Holdings Ltd
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Hitachi Maxell Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat square battery with an enough volume in the battery, and to surely prevent wrinkles from occurring in caulking a corner. <P>SOLUTION: A raw material for a positive electrode can 5 is a ferrite stainless steel or a cladding material which uses it as a base material. The radius of a corner 19 of the bottom wall of the positive electrode can 5 satisfies a relation R/t=8 to 20, where t is the thickness of the opening top of the peripheral side wall to be processed by caulking toward the inside. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、発電要素を収容する電池缶が、四角形状の底面壁の外周から周側壁を上向きに曲げた扁平角皿状の正極缶と、四角形状の上面壁の外周から周側壁を下向きに曲げた扁平角皿状の負極缶とを含み、前記正極缶の前記周側壁の開口上端部分が内方に向けて封口ガスケットを介してかしめ加工された扁平角型電池に関する。   In the present invention, a battery can containing a power generation element is a flat plate-shaped positive electrode can in which the peripheral side wall is bent upward from the outer periphery of the rectangular bottom wall, and the peripheral side wall is downward from the outer periphery of the rectangular top wall. The present invention relates to a flat rectangular battery including a bent flat plate-shaped negative electrode can, the upper end portion of the opening of the peripheral side wall of the positive electrode can being crimped through a sealing gasket inward.

本発明のように、正極缶の底面壁のコーナー部がアール状となっている扁平角型電池の分野において、コーナー部の半径寸法（Ｒ）（図１参照）を、周側壁の開口上端部分の板厚寸法（ｔ）（図３参照）との関係で規定すること自体は、特許文献１に公知である。そこでは、Ｒ／ｔ＝２〜２０の関係式を満たすように、コーナー部の半径寸法（Ｒ）を設定しており（請求項５）、これによれば「金属プレスによる加工に無理がなく、小さいコーナー部半径で角形に形成することができる」とある（段落番号００１５）。なお、特許文献１においては、正極缶はステンレス板を用いている（段落番号００２２）。   As in the present invention, in the field of flat rectangular batteries in which the corner portion of the bottom wall of the positive electrode can is rounded, the radius dimension (R) of the corner portion (see FIG. 1) It is known in Japanese Patent Application Laid-Open No. H11-228707 that the thickness is defined in relation to the plate thickness dimension (t) (see FIG. 3). There, the radius dimension (R) of the corner portion is set so as to satisfy the relational expression of R / t = 2 to 20 (Claim 5). It can be formed into a square with a small corner radius ”(paragraph number 0015). In Patent Document 1, a stainless steel plate is used for the positive electrode can (paragraph number 0022).

特開２００２−１２４２１９号公報（請求項５、図３、段落番号００１５、段落番号００２２）JP 2002-124219 A (Claim 5, FIG. 3, paragraph number 0015, paragraph number 0022)

上記特許文献の問題は、コーナー部分の半径寸法（Ｒ）を上記範囲とした場合でも、かしめ加工時に直線部分とコーナー部分との加圧力が不均一となり、その結果、図４に示すように、正極缶５のコーナー部分１９にシワ３０ができやすいことにある。このようにコーナー部分１９にシワ３０ができると、電池全体の外観上の体裁が著しく損なわれるほか、封口性が低下して液漏れを生じる。コーナー部分の半径寸法（Ｒ）が大きくとれば、シワ３０の発生を良好に防ぐことができるものの、その場合にはデッドスペースが大きくなって電池内容積の低下を招く。   Even if the radius dimension (R) of the corner portion is in the above range, the problem with the above patent document is that the applied pressure between the linear portion and the corner portion is not uniform during caulking, and as a result, as shown in FIG. This is because wrinkles 30 are easily formed in the corner portion 19 of the positive electrode can 5. When the wrinkles 30 are formed in the corner portion 19 in this manner, the appearance of the entire battery is significantly impaired, and the sealing performance is lowered to cause liquid leakage. If the radius dimension (R) of the corner portion is large, the generation of wrinkles 30 can be prevented satisfactorily, but in that case, the dead space becomes large and the battery internal volume is reduced.

本発明の目的は、扁平角型電池に関して、電池内容積を良好に担保しながら、かしめ加工時において直線部分とコーナー部分との加圧力が不均一となることに起因してコーナー部分にシワができることを阻止し、以て封口性の低下による耐漏液性の低下と、外観体裁が損なわれることとを確実に防ぐことにある。   The object of the present invention is that, with respect to a flat rectangular battery, wrinkles are generated in the corner portion due to non-uniform pressure applied between the linear portion and the corner portion during caulking while ensuring a good battery internal volume. Therefore, it is possible to prevent the deterioration of the leakage resistance due to the deterioration of the sealing performance and to prevent the appearance appearance from being damaged.

本発明は、図２に示すように、正極材１０、負極材１１などの発電要素を収容する電池缶１が、四角形状の底面壁２の外周から周側壁３を上向きに曲げた扁平角皿状の正極缶５と、四角形状の上面壁６の外周から周側壁７を下向きに曲げた扁平角皿状の負極缶９とを含み、図３に示すように、前記正極缶５の前記周側壁３の開口上端部分３ａが内方に向けて封口ガスケット１７を介してかしめ加工された扁平角型電池である。   As shown in FIG. 2, the present invention is a flat square dish in which a battery can 1 containing power generation elements such as a positive electrode material 10 and a negative electrode material 11 is bent with a peripheral side wall 3 upward from an outer periphery of a rectangular bottom wall 2. 3 and a flat plate-shaped negative electrode can 9 in which the peripheral side wall 7 is bent downward from the outer periphery of the rectangular upper wall 6, and as shown in FIG. This is a flat rectangular battery in which the opening upper end portion 3a of the side wall 3 is caulked through a sealing gasket 17 inward.

そのうえで、前記正極缶５は、フェライト系のステンレス鋼、又はこれを母材としてなるクラッド材を素材とするものとする。そして、図１に示すごとく、前記正極缶５の前記底面壁２のコーナー部分１９がアール状とされており、その半径寸法（Ｒ）が、内方に向けてかしめ加工される前記周側壁３の開口上端部分３ａの板厚寸法（ｔ）と、Ｒ／ｔ＝８〜２０の関係に設定されていることを特徴とする。   In addition, the positive electrode can 5 is made of a ferritic stainless steel or a clad material using this as a base material. And as shown in FIG. 1, the corner part 19 of the said bottom face wall 2 of the said positive electrode can 5 is made into the round shape, and the said radial side wall 3 by which the radial dimension (R) is crimped toward inward. The thickness dimension (t) of the upper end portion 3a of the opening and the relationship of R / t = 8-20 are set.

前記ステンレス鋼は、そのビッカーズ硬度が１３０〜３００の範囲にあるものであることが好ましい。当該ビッカーズ硬度を満足するフェライト系のステンレス鋼の具体例としては、ＳＵＳ４３０やＳＵＳ４４４などを挙げることができる。   The stainless steel preferably has a Vickers hardness of 130 to 300. Specific examples of the ferritic stainless steel satisfying the Vickers hardness include SUS430 and SUS444.

扁平角型電池の内容積は、正極缶５の底面壁２のコーナー部分１９を直角（Ｒ＝０）としたときに最大となるため、かしめ加工の容易化を図るためにコーナー部分１９をアール状とした場合にも、その半径寸法（Ｒ）を可及的に小さくすることが、大きな内容積を担保するうえで好ましいことではある。しかし、半径寸法（Ｒ）が小さすぎると、かしめ加工によりコーナー部１９に圧縮応力が働いた際に、図４に示すようなシワ３０が発生するおそれがある。このようにシワ３０ができる半径寸法（Ｒ）の下限値は、内方に向けてかしめ加工される周側壁３の開口上端部分３ａの板厚寸法（ｔ）はもとより、正極缶５の材質（ステンレス鋼の種別）によっても大きく左右されるものである。   The inner volume of the flat rectangular battery is maximized when the corner portion 19 of the bottom wall 2 of the positive electrode can 5 is set to a right angle (R = 0). Therefore, the corner portion 19 is rounded to facilitate the caulking process. Even in the case of the shape, it is preferable to make the radial dimension (R) as small as possible in order to secure a large internal volume. However, if the radial dimension (R) is too small, wrinkles 30 as shown in FIG. 4 may occur when compressive stress is applied to the corner portion 19 by caulking. The lower limit value of the radius dimension (R) that the wrinkle 30 can be formed in this way is not only the plate thickness dimension (t) of the opening upper end portion 3a of the peripheral side wall 3 that is caulked inward, but also the material of the positive electrode can 5 ( It depends greatly on the type of stainless steel.

そこで、本発明者等は、種々のステンレス鋼を用いて正極缶５を作製するとともに、そのコーナー部分１９の半径寸法（Ｒ）を適宜に変化させた結果、フェライト系のステンレス鋼、又はこれを母材としてなるクラッド材を正極缶５の素材として選択するとともに、当該材質において、かしめ加工時にシワ３０が生じない半径寸法（Ｒ）の最小値は、周側壁３の開口上端部分３ａの板厚寸法（ｔ）に対してＲ／ｔ＝８を満たすものであることを見出した。すなわち、コーナー部分１９の半径寸法（Ｒ）が、Ｒ／ｔ＝８以上であれば、かしめ加工時においてコーナー部分１９にシワ３０ができることがなく、耐漏液性に優れた扁平角型電池を得ることができる。また、シワ３０が生じないため、外観上の体裁が低下する不具合も一切ない。加えて、Ｒ／ｔ＝２０以下であれば、概ね良好な電池内容積を確保できる。   Therefore, the present inventors made the positive electrode can 5 using various stainless steels, and changed the radius dimension (R) of the corner portion 19 as appropriate. As a result, A clad material as a base material is selected as a material of the positive electrode can 5, and the minimum value of the radial dimension (R) in which the wrinkle 30 does not occur during caulking is the plate thickness of the upper end portion 3 a of the opening of the peripheral side wall 3. It was found that R / t = 8 was satisfied with respect to the dimension (t). That is, if the radius dimension (R) of the corner portion 19 is R / t = 8 or more, the corner portion 19 is not wrinkled 30 during the caulking process, and a flat rectangular battery having excellent leakage resistance is obtained. be able to. Moreover, since wrinkles 30 do not occur, there is no problem that the appearance on the appearance is lowered. In addition, if R / t = 20 or less, a generally good battery internal volume can be secured.

一例を挙げると、板厚寸法（ｔ）が0.２５mmのＳＵＳ４３０ステンレス鋼を用いて、コーナー部分１９の半径寸法（Ｒ）を２mm以上に設定して、電池缶１を形成した場合には（Ｒ／ｔ＝８）、コーナー部分１９にシワ３０は一切見られなかった。また、縦・横寸法が２４mm×２４mmで、厚み寸法が３mmの正方形状の扁平角型電池では、半径寸法（Ｒ）が５mm以下であれば（Ｒ／ｔ＝２０）、９７％以上の電池内容積比率を得ることができる。ここで電池内容積比率とは、正極缶５の底面壁２のコーナー部分１９を直角（Ｒ＝０）としたときの電池内容積に対する割合を意味する。   For example, when the battery can 1 is formed by using SUS430 stainless steel having a plate thickness dimension (t) of 0.25 mm and setting the radius dimension (R) of the corner portion 19 to 2 mm or more ( R / t = 8), no wrinkles 30 were seen at the corner 19. In addition, in the case of a square-shaped flat rectangular battery having a vertical and horizontal dimension of 24 mm × 24 mm and a thickness dimension of 3 mm, if the radius dimension (R) is 5 mm or less (R / t = 20), a battery of 97% or more An internal volume ratio can be obtained. Here, the battery internal volume ratio means a ratio to the battery internal volume when the corner portion 19 of the bottom wall 2 of the positive electrode can 5 is a right angle (R = 0).

材料の機械的性質には、引張り強さ、伸びおよび硬度などがあり、それらの関係は、材料硬度が低ければ引張り強さは小さくなり、伸びは大きくなる。逆に硬度が高くなるほど引張り強さは向上するが、伸びは低下する。そのため、本発明者等は扁平角型電池の正極缶５の材料として適した硬度は、ビッカーズ硬度１３０以上、３００以下の範囲とする。これは１３０を下回るとかしめが不十分となり、耐漏液性が不良となること、３００を超えると、シワができやすくなり、耐漏液性の低下と外観体裁の不良を招くことによる。   The mechanical properties of the material include tensile strength, elongation and hardness, and the relationship between them is that if the material hardness is low, the tensile strength is small and the elongation is large. Conversely, the higher the hardness, the higher the tensile strength, but the lower the elongation. Therefore, the present inventors set the hardness suitable as a material for the positive electrode can 5 of the flat rectangular battery in the range of 130 to 300 in Vickers hardness. This is because caulking becomes insufficient when the value is less than 130, resulting in poor liquid leakage resistance, and when it exceeds 300, wrinkles are likely to occur, resulting in deterioration of liquid resistance and poor appearance.

図１ないし図３は、本発明の実施形態に係る扁平角型電池を示す。発電要素を収容する電池缶１は、正方形の底面壁２の外周から周側壁３を上方へ向けて垂直に曲げた金属製の正極缶５と、正方形の上面壁６の外周から周側壁７を下方へ向けた金属製の負極缶９とを含む。正極缶５は、ＳＵＳ４３０に代表されるフェライト系ステンレス鋼、あるいは当該フェライト系ステンレス鋼を母材としたアルミクラッド材を素材とするものである。ＳＵＳ４３０のビッカーズ硬度は、１７０程度である。   1 to 3 show a flat rectangular battery according to an embodiment of the present invention. The battery can 1 that accommodates the power generation element includes a metal positive electrode can 5 bent vertically from the outer periphery of the square bottom wall 2 and the peripheral side wall 7 from the outer periphery of the square top wall 6. And a metal negative electrode can 9 facing downward. The positive electrode can 5 is made of a ferritic stainless steel represented by SUS430 or an aluminum clad material using the ferritic stainless steel as a base material. The Vickers hardness of SUS430 is about 170.

発電要素として、正極缶５には、活物質である二酸化マンガンをプレス成形した正極材１０が収納され、負極缶９には、金属リチウムからなる負極材１１が収納されている。正極材１０と負極材１１との間には、ポリプロピレン製不織布からなるセパレータ１２が介在する。電解液は、溶媒としてのプロピレンカーボネート（ＰＣ）／1.２−ジトメキシエタン（ＤＭＥ）＝１／１（体積比）に、溶質として0.５Ｍ過塩素酸リチウム（ＬｉＣｌ4 ）を溶解させたものを用いた。 As a power generation element, the positive electrode can 5 contains a positive electrode material 10 obtained by press-molding manganese dioxide, which is an active material, and the negative electrode can 9 contains a negative electrode material 11 made of metallic lithium. A separator 12 made of a polypropylene nonwoven fabric is interposed between the positive electrode material 10 and the negative electrode material 11. The electrolytic solution was prepared by dissolving 0.5M lithium perchlorate (LiCl 4 ) as a solute in propylene carbonate (PC) /1.2-ditomexitan (DME) = 1/1 (volume ratio) as a solvent. Using.

電池組み立て前のブランク状態における正極缶５は、図２に示すごとく上面が開口する角皿状を呈している。一方、ブランク状態における負極缶９は、図２に示すごとく下面が開口する角皿状を呈している。   The positive electrode can 5 in a blank state before battery assembly has a square dish shape with an upper surface opened as shown in FIG. On the other hand, the negative electrode can 9 in the blank state has a square dish shape whose bottom surface is open as shown in FIG.

負極缶９の周側壁７は、図３に示すごとく、上下の中間に外側へ張り出す段部１３を有し、該段部１３より下方の下端部１５が垂直状に形成されており、下端部１５の外側に下端部１５の下端全周からばね片１６が上向きに折り返し形成されている。   As shown in FIG. 3, the peripheral side wall 7 of the negative electrode can 9 has a step portion 13 projecting outward in the middle between the upper and lower sides, and a lower end portion 15 below the step portion 13 is formed in a vertical shape. A spring piece 16 is formed on the outside of the portion 15 so as to be folded upward from the entire periphery of the lower end of the lower end portion 15.

電池の組み立てに際しては、図２に示すごとく、負極缶９の周側壁７に封口ガスケット１７を装着して、正極缶５に負極缶９を嵌合し、正極缶５の周側壁３の開口上端部３ａを内方に向けてかしめ加工する。これで正極缶５の周側壁３と、負極缶９の周側壁７の段部１３、下端部１５およびばね片１６との間において封口ガスケット１７が圧縮状態に加工されて介在する。封口ガスケット１７は、ポリプロピレン樹脂やポリフェニリンサルファイド樹脂などの絶縁材を素材にして、射出成形によって成形されている。   When assembling the battery, as shown in FIG. 2, a sealing gasket 17 is attached to the peripheral side wall 7 of the negative electrode can 9, the negative electrode can 9 is fitted to the positive electrode can 5, and the upper end of the peripheral wall 3 of the positive electrode can 5 is opened. Caulking is performed with the portion 3a facing inward. The sealing gasket 17 is processed into a compressed state between the peripheral side wall 3 of the positive electrode can 5 and the step portion 13, the lower end portion 15 and the spring piece 16 of the peripheral side wall 7 of the negative electrode can 9. The sealing gasket 17 is formed by injection molding using an insulating material such as polypropylene resin or polyphenylin sulfide resin as a raw material.

よって得られた電池缶１は、底面壁２の一辺が２４mmの正方形で、電池厚みは３mmとした。また、四隅のコーナー部分１９に係る円弧の半径寸法（Ｒ）は、周側壁３の板厚寸法（ｔ）に対して、Ｒ／ｔ＝８〜２０となるものとした。具体的には、周側壁３を含む板厚寸法（ｔ）が0.２５mmの場合には、Ｒ値の好適な範囲は２〜５mmとした。このように半径寸法Ｒを規定したのは、当該数値範囲内であれば、電池内容積の低減を最小限に抑えることができること、何よりも正極缶５の素材としてＳＵＳ４３０に代表されるフェライト系ステンレス鋼、あるいは当該フェライト系ステンレス鋼を母材としたアルミクラッド材を選択したことと相俟って、コーナー部分１９にシワ３０（図４参照）ができることを阻止して、液漏れの発生と外観体裁の低下を確実に防ぐことが可能となることによる。   Thus, the obtained battery can 1 was a square whose one side of the bottom wall 2 was 24 mm, and the battery thickness was 3 mm. In addition, the radius dimension (R) of the arc related to the corner portions 19 at the four corners is R / t = 8 to 20 with respect to the plate thickness dimension (t) of the peripheral side wall 3. Specifically, when the thickness (t) including the peripheral side wall 3 is 0.25 mm, the preferable range of the R value is 2 to 5 mm. In this way, the radial dimension R is defined as long as it is within the numerical range, the reduction of the battery internal volume can be minimized, and above all, the ferritic stainless steel represented by SUS430 as the material of the positive electrode can 5 Combined with the selection of steel or an aluminum clad material based on the ferritic stainless steel, the formation of wrinkles 30 (see FIG. 4) at the corner portion 19 is prevented, and the occurrence of liquid leakage and appearance This is because it is possible to surely prevent deterioration in appearance.

次に、実施例を挙げて本発明をより具体的に説明する。但し、本発明はこれら実施例に限定されるものではない。   Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

（実施例１）
フェライト系ステンレス鋼であるＳＵＳ４３０（ビッカーズ硬度１７０）のステンレス板を用いて、図１ないし図３に示すような正極缶５を作製した。周側壁３の開口上端部分３ａの板厚寸法（ｔ）を含む、ステンレス板の板厚寸法は0.２５mmとした。電池缶１は２４mm×２４mmの略正方形状の扁平角型とし、四隅のコーナー部分１９の半径寸法（Ｒ）は３mmとした。電池缶１の厚み寸法は３mmとした。このときのＲ／ｔ値は１２である。 (Example 1)
Using a stainless steel plate of SUS430 (Vickers hardness 170), which is a ferritic stainless steel, a positive electrode can 5 as shown in FIGS. 1 to 3 was produced. The plate thickness dimension of the stainless steel plate including the plate thickness dimension (t) of the opening upper end portion 3a of the peripheral side wall 3 was 0.25 mm. The battery can 1 was a flat square shape of 24 mm × 24 mm, and the radius dimension (R) of the corner portions 19 at the four corners was 3 mm. The thickness dimension of the battery can 1 was 3 mm. The R / t value at this time is 12.

（実施例２）
コーナー部分１９の半径寸法（Ｒ）を２mmとしたこと以外は、実施例１と同様にして、実施例２に係る扁平角型電池を作製した。このときのＲ／ｔ値は８である。 (Example 2)
A flat rectangular battery according to Example 2 was produced in the same manner as in Example 1 except that the radius dimension (R) of the corner portion 19 was set to 2 mm. The R / t value at this time is 8.

（実施例３）
コーナー部分１９の半径寸法（Ｒ）を４mmとしたこと以外は、実施例１と同様にして、実施例３に係る扁平角型電池を作製した。このときのＲ／ｔ値は１６である。 (Example 3)
A flat rectangular battery according to Example 3 was produced in the same manner as in Example 1 except that the radius dimension (R) of the corner portion 19 was 4 mm. The R / t value at this time is 16.

（実施例４）
ＳＵＳ４３０を母材としてなるクラッド材で、正極缶５を作製したこと以外は、実施例１と同様にして、実施例４に係る扁平角型電池を作製した。このクラッド材は、ＳＵＳ４３０の厚み寸法が２８５μｍで、アルミの厚み寸法が１５μｍであり、全体として0.３mmの板厚寸法を有するものであった。なお、このときのＲ／ｔ値は１０である。 Example 4
A flat rectangular battery according to Example 4 was manufactured in the same manner as in Example 1 except that the positive electrode can 5 was manufactured using a clad material having SUS430 as a base material. This clad material had a thickness dimension of SUS430 of 285 μm, an aluminum thickness dimension of 15 μm, and a plate thickness dimension of 0.3 mm as a whole. The R / t value at this time is 10.

（比較例１）
コーナー部分１９の半径寸法（Ｒ）を1.５mmとしたこと以外は、実施例１と同様にして、比較例１に係る扁平角型電池を作製した。このときのＲ／ｔ値は６である。 (Comparative Example 1)
A flat rectangular battery according to Comparative Example 1 was produced in the same manner as in Example 1 except that the radius dimension (R) of the corner portion 19 was set to 1.5 mm. The R / t value at this time is 6.

（比較例２）
コーナー部分１９の半径寸法（Ｒ）を６mmとしたこと以外は、実施例１と同様にして、実施例３に係る扁平角型電池を作製した。このときのＲ／ｔ値は２４である。 (Comparative Example 2)
A flat rectangular battery according to Example 3 was produced in the same manner as in Example 1 except that the radius dimension (R) of the corner portion 19 was 6 mm. The R / t value at this time is 24.

以上のような実施例１乃至４、および比較例１、２に係る扁平角型電池に対して、電池内容比率を求めた。ここで電池内容比率とは、コーナー部分１９を直角（Ｒ＝０）とした場合の電池内容積を１として、それに対する割合を意味する。また、かしめ加工後のコーナー部１９におけるシワの発生状況と、耐漏液性試験を行った。耐漏液性試験は、６０℃、９０％ＲＨ貯蔵８０日後の結果を示す。その結果を表１に示す。   The battery content ratio was determined for the flat rectangular batteries according to Examples 1 to 4 and Comparative Examples 1 and 2 as described above. Here, the battery content ratio means a ratio with respect to the battery internal volume when the corner portion 19 is a right angle (R = 0). In addition, the occurrence of wrinkles in the corner 19 after the caulking process and a leak resistance test were performed. The liquid leakage resistance test shows the result after 80 days of storage at 60 ° C. and 90% RH. The results are shown in Table 1.

Figure 2005276579
Figure 2005276579

扁平角型電池の内容積は、コーナー部分１９が直角の場合、すなわち完全な正方形の場合が最大であるが、正極缶５をかしめて封口するには、コーナー部分１９を円弧状（Ｒ状）とすることが必要となる。本発明者等は、内容積比率は0.９７以上であれば製品として許容できる範囲であると考えており、当該観点からすると、比較例２のごとく、コーナー部分１９の半径寸法（Ｒ値）が６mmの形態（Ｒ／ｔ＝２４）は、内容積が小さすぎ、実用上問題がある。これに対して、実施例１乃至４の形態では、いずれも内容積比率は0.９７以上であり、その点で扁平角型電池として好適である。   The inner volume of the flat rectangular battery is maximum when the corner portion 19 is a right angle, that is, when it is a perfect square, but in order to seal the positive electrode can 5 by caulking, the corner portion 19 has an arc shape (R shape). It is necessary to The present inventors consider that the internal volume ratio is 0.97 or more and is acceptable as a product. From this point of view, as in Comparative Example 2, the radius dimension (R value) of the corner portion 19 is considered. Is 6 mm (R / t = 24), the internal volume is too small, and there is a practical problem. On the other hand, in the forms of Examples 1 to 4, the internal volume ratio is 0.97 or more, which is preferable as a flat rectangular battery.

一方、比較例１より、Ｒ／ｔ値が６となると、半径寸法は小さいため内容積比率は良好な値を示すものの、コーナー部分１９にシワが発生したり、液漏れを生じたりすることがわかる。これに対して実施例１乃至４のように、正極缶５の材質をフェライト系のステンレス鋼、又はこれを母材としてなるクラッド材としたうえで、Ｒ／ｔ値を８〜２０程度としてあると、コーナー部分１９にシワが発生することがなく、従って電池の外観体裁を良好に保つことができ、しかも液漏れがなく、動作上の不具合もないことがわかる。以上より、正極缶５の材質をフェライト系のステンレス鋼、又はこれを母材としてなるクラッド材とするとともに、Ｒ／ｔ値を８〜２０としてあると、電池内容積を良好に確保できるとともに、外観上の体裁と耐漏液性に優れた扁平角型電池が得らえることが確認できた。   On the other hand, from Comparative Example 1, when the R / t value is 6, although the radial volume is small, the internal volume ratio shows a good value, but the corner portion 19 may be wrinkled or liquid leakage may occur. Understand. On the other hand, as in Examples 1 to 4, the material of the positive electrode can 5 is ferritic stainless steel or a clad material using this as a base material, and the R / t value is about 8 to 20. It can be seen that the corner portion 19 is not wrinkled, so that the appearance of the battery can be kept good, there is no liquid leakage, and there are no operational problems. As mentioned above, while making the material of the positive electrode can 5 into a ferritic stainless steel or a clad material using this as a base material, and having an R / t value of 8 to 20, it is possible to ensure a good battery internal volume, It was confirmed that a flat rectangular battery excellent in appearance and liquid leakage resistance was obtained.

上記実施例においては、フェライト系のステンレス鋼としてＳＵＳ４３０を用いたが、例えばＳＵＳ４４４などであってもよい。   In the above embodiment, SUS430 is used as the ferritic stainless steel, but SUS444 may be used, for example.

本発明に係る扁平角型電池の平面図である。1 is a plan view of a flat rectangular battery according to the present invention. 分解状態での縦断面図である。It is a longitudinal cross-sectional view in an exploded state. 要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part. 従来の扁平角型電池の問題点を示す図である。It is a figure which shows the problem of the conventional flat rectangular battery.

符号の説明Explanation of symbols

１ 電池缶
２ 正極缶の底面壁
３ 正極缶の周側壁
３ａ 周側壁の開口上端部分
５ 正極缶
６ 負極缶の上面壁
７ 負極缶の周側壁
９ 負極缶
１７ 封口ガスケット
１９ コーナー部分
Ｒ コーナー部分の半径寸法
ｔ 周側壁の開口上端部分の板厚寸法 DESCRIPTION OF SYMBOLS 1 Battery can 2 Bottom wall 3 of positive electrode can Peripheral side wall 3a of positive electrode can Opening upper end part 5 of peripheral side wall Positive electrode can 6 Upper surface wall of negative electrode can 7 Peripheral side wall 9 of negative electrode can Negative electrode can 17 Sealing gasket 19 Corner part R Corner part R Radial dimension t Thickness dimension of the upper end of the opening on the peripheral side wall

Claims (2)

発電要素を収容する電池缶が、四角形状の底面壁の外周から周側壁を上向きに曲げた扁平角皿状の正極缶と、四角形状の上面壁の外周から周側壁を下向きに曲げた扁平角皿状の負極缶とを含み、前記正極缶の前記周側壁の開口上端部分が内方に向けて封口ガスケットを介してかしめ加工された扁平角型電池であって、
前記正極缶は、フェライト系のステンレス鋼、又はこれを母材としてなるクラッド材を素材とするものであり、
前記正極缶の前記底面壁のコーナー部分はアール状とされており、その半径寸法（Ｒ）が、内方に向けてかしめ加工される前記周側壁の開口上端部分の板厚寸法（ｔ）と、Ｒ／ｔ＝８〜２０の関係に設定されていることを特徴とする扁平角型電池。 The battery can that houses the power generation element is a flat rectangular plate-shaped positive electrode can with the peripheral side wall bent upward from the outer periphery of the rectangular bottom wall, and the flat angle with the peripheral side wall bent downward from the outer periphery of the rectangular top wall A flat rectangular battery including a dish-shaped negative electrode can, wherein the upper end of the opening of the peripheral side wall of the positive electrode can is caulked through a sealing gasket toward the inside,
The positive electrode can is made of a ferritic stainless steel, or a clad material made of this as a base material,
The corner portion of the bottom wall of the positive electrode can is rounded, and the radial dimension (R) is the plate thickness dimension (t) of the upper end portion of the opening of the peripheral side wall that is caulked inward. , R / t = 8-20. The flat rectangular battery is characterized by being set. 前記ステンレス鋼は、そのビッカーズ硬度が１３０〜３００の範囲にあるものである請求項１記載の扁平角型電池。   The flat rectangular battery according to claim 1, wherein the stainless steel has a Vickers hardness of 130 to 300.
JP2004086778A 2004-03-24 2004-03-24 Flat square battery Pending JP2005276579A (en)

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WO2018159266A1 (en) * 2017-02-28 2018-09-07 株式会社 豊田自動織機 Power storage apparatus and method for manufacturing power storage apparatus
KR20190098633A (en) 2018-02-14 2019-08-22 주식회사 엘지화학 Stainless Steel Cylindrical Battery Case Having Non-uniform Thickness
WO2022085318A1 (en) * 2020-10-21 2022-04-28 株式会社村田製作所 Secondary battery
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JP2002134071A (en) * 2000-10-30 2002-05-10 Matsushita Electric Ind Co Ltd Flattened square type battery
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Publication number Priority date Publication date Assignee Title
JP2000312979A (en) * 1999-04-30 2000-11-14 Sumitomo Special Metals Co Ltd Aluminum/stainless steel clad material, and its manufacturing method
JP2002134071A (en) * 2000-10-30 2002-05-10 Matsushita Electric Ind Co Ltd Flattened square type battery
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JP2004014289A (en) * 2002-06-06 2004-01-15 Toshiba Battery Co Ltd Flat battery

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Publication number Priority date Publication date Assignee Title
DE112011105177B4 (en) 2011-04-22 2022-06-15 Toyota Jidosha Kabushiki Kaisha braking system
WO2018159266A1 (en) * 2017-02-28 2018-09-07 株式会社 豊田自動織機 Power storage apparatus and method for manufacturing power storage apparatus
KR20190098633A (en) 2018-02-14 2019-08-22 주식회사 엘지화학 Stainless Steel Cylindrical Battery Case Having Non-uniform Thickness
WO2022085318A1 (en) * 2020-10-21 2022-04-28 株式会社村田製作所 Secondary battery
JPWO2022085318A1 (en) * 2020-10-21 2022-04-28
JP7448031B2 (en) 2020-10-21 2024-03-12 株式会社村田製作所 secondary battery

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