JP2007323845A - Battery can - Google Patents
Battery can Download PDFInfo
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- JP2007323845A JP2007323845A JP2006150038A JP2006150038A JP2007323845A JP 2007323845 A JP2007323845 A JP 2007323845A JP 2006150038 A JP2006150038 A JP 2006150038A JP 2006150038 A JP2006150038 A JP 2006150038A JP 2007323845 A JP2007323845 A JP 2007323845A
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- battery
- wall
- side wall
- long side
- corner
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- 239000000463 material Substances 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 230000006378 damage Effects 0.000 description 8
- 238000005482 strain hardening Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
-
- 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
Description
本発明は、内圧に対して抵抗する強度の向上させた電池缶に関する。 The present invention relates to a battery can with improved strength that resists internal pressure.
携帯電話、ＰＤＡ（Ｐｅｒｓｏｎａｌ Ｄｉｇｉｔａｌ Ａｓｓｉｓｔａｎｔ）、またはノート型パーソナルコンピュータ等に使用される二次電池は、充電時及び連続使用時に発熱する。そのため、この発熱による電解液またはガスの膨張により、二次電池の内部に大きな内圧が発生する。その内圧に耐えきれず、電池缶が破壊してしまう現象が発生する場合がある。しかしながら、そのような内圧は、一定の基準内であれば安全弁が作動し、電池の暴発を防止することができる（例えば、特許文献１、特許文献２）。 A secondary battery used in a cellular phone, a PDA (Personal Digital Assistant), a notebook personal computer, or the like generates heat during charging and continuous use. Therefore, a large internal pressure is generated inside the secondary battery due to the expansion of the electrolyte or gas due to the heat generation. In some cases, the internal pressure cannot be withstood and the battery can breaks. However, if such an internal pressure is within a certain standard, the safety valve operates to prevent battery explosion (for example, Patent Document 1 and Patent Document 2).
さて、年々電池の小型化、薄型化が進む中、益々、電池性能を上げなくてはならない。電池性能を上げるために、電池缶の内容積を増すことが常道手段として挙げられる（例えば、特許文献３）。さらに、外形の大きさを変えずに、内容積を増すには電池缶の側壁を極限まで薄くすることが望まれる（例えば、特許文献４）。
しかしながら、そのように電池缶の側壁を極限まで薄くした結果、電池缶の局部に集中加重が掛かり、安全弁の作動圧より低い圧力で電池缶が破壊に至る現象が発生するおそれがあった。 However, as a result of thinning the side wall of the battery can as much as possible, a concentrated load is applied to the local portion of the battery can, and there is a possibility that the battery can break down at a pressure lower than the operating pressure of the safety valve.
図１は、一般的な電池缶の外観構成を示す。図１（Ａ）は、電池缶１の外観斜視図である。図１（Ｂ）は、図１（Ａ）のＸａ−Ｘｂの断面図である。図１（Ｃ）は、図１（Ａ）のＹａ−Ｙｂの断面図である。 FIG. 1 shows an external configuration of a general battery can. FIG. 1A is an external perspective view of the battery can 1. FIG. 1B is a cross-sectional view taken along the line Xa-Xb in FIG. FIG. 1C is a cross-sectional view taken along line Ya-Yb in FIG.
電池缶１は、一枚の金属板をプレス加工にて有底角筒状に成型した外装缶である。電池缶１は、概して、長辺側壁２、短辺側壁３、底壁４、長辺Ｒ壁５、短辺Ｒ壁６、コーナー壁７から構成される。底壁４は、電池缶１の底部を形成しており、長辺と短辺とを有する略扁平状の長方形をなしている。 The battery can 1 is an outer can that is formed by pressing a single metal plate into a bottomed rectangular tube. The battery can 1 generally includes a long side wall 2, a short side wall 3, a bottom wall 4, a long side R wall 5, a short side R wall 6, and a corner wall 7. The bottom wall 4 forms the bottom of the battery can 1 and has a substantially flat rectangle having a long side and a short side.
長辺側壁２は、底壁４の長辺側にある電池缶１の側壁である。短辺側壁３は、底壁４の短辺側にある電池缶１の側壁である。長辺Ｒ壁５は、底壁４と長辺側壁２との連結部分であり、その壁面は曲面形状を有している。短辺Ｒ壁６は、底壁４と短辺側壁３との連結部分であり、その壁面は曲面形状を有している。コーナー壁７は、長辺側壁２と短辺側壁３とが隣接した角部分であり、その壁面は曲面形状を有している。この図１で示す様な電池缶１の設計が、一般的である。 The long side wall 2 is a side wall of the battery can 1 on the long side of the bottom wall 4. The short side wall 3 is a side wall of the battery can 1 on the short side of the bottom wall 4. The long side R wall 5 is a connecting portion between the bottom wall 4 and the long side wall 2, and the wall surface has a curved shape. The short side R wall 6 is a connecting portion between the bottom wall 4 and the short side wall 3, and the wall surface has a curved shape. The corner wall 7 is a corner portion where the long side wall 2 and the short side wall 3 are adjacent to each other, and the wall surface has a curved shape. The design of the battery can 1 as shown in FIG. 1 is common.
図２は、図１の部分Ｋの拡大図である。電池缶１は、通常、プレス加工により製造される。長辺側壁２と短辺側壁３は、プレス加工時に非常に大きなシゴキを受けるために、長辺側壁２と短辺側壁３の板厚が薄くなることに加え、最も激しい加工硬化が発生する。 FIG. 2 is an enlarged view of a portion K in FIG. The battery can 1 is usually manufactured by pressing. Since the long side wall 2 and the short side wall 3 are subjected to very large squeaks during press working, the plate thickness of the long side wall 2 and the short side wall 3 is reduced, and the most severe work hardening occurs.
次に、長辺Ｒ壁５及び短辺Ｒ壁６の外表面及び内表面はそれぞれ、曲率半径Ｒ，ｒの略曲面を有している。この曲率半径Ｒ，ｒの成すそれぞれの円の中心ＣR，Ｃrは、異なった位置にある。 Next, the outer surface and inner surface of the long side R wall 5 and the short side R wall 6 have substantially curved surfaces with curvature radii R and r, respectively. The centers C R and C r of the respective circles formed by the curvature radii R and r are at different positions.
例えば、Ｒ＝１．０［ｍｍ］、ｒ＝０．６［ｍｍ］、長辺側壁２の板厚（符号１２）＝０．２［ｍｍ］、短辺側壁３の板厚（符号１２）＝０．２［ｍｍ］、底壁４の板厚（符号１１）＝０．５［ｍｍ］で電池缶１を設計した場合を考えてみる。この場合、長辺Ｒ壁５及び短辺Ｒ壁６から長辺側壁２及び短辺側壁３へ差し掛かる部分、側壁厚が急激に薄くなり、厚みが減少する。この設計に基づくプレス加工について図３で説明する。 For example, R = 1.0 [mm], r = 0.6 [mm], plate thickness of the long side wall 2 (reference numeral 12) = 0.2 [mm], plate thickness of the short side wall 3 (reference numeral 12) Consider the case where the battery can 1 is designed with = 0.2 [mm] and the thickness of the bottom wall 4 (reference numeral 11) = 0.5 [mm]. In this case, the part of the long side R wall 5 and the short side R wall 6 that reaches the long side wall 2 and the short side wall 3 and the side wall thickness are drastically reduced and the thickness is reduced. The press working based on this design will be described with reference to FIG.
図３は、プレス加工による電池缶１の外形の形成を示す。図３（Ａ）は、電池缶１の斜視図である。図３（Ｂ）は、部分Ｌの拡大図である。上記の設計に基づいて加工すると、厚い底壁４と、比較的厚い板厚及び加工硬化の進んだ長辺Ｒ壁５及び短辺Ｒ壁６と、構造上の強度と加工硬化で強度を増したコーナー壁７に隣接した長辺側壁２及び短辺側壁３と、からなる電池缶１が形成される。 FIG. 3 shows the formation of the outer shape of the battery can 1 by press working. FIG. 3A is a perspective view of the battery can 1. FIG. 3B is an enlarged view of the portion L. When processed based on the above design, the thick bottom wall 4, the relatively thick plate thickness and the long side R wall 5 and short side R wall 6 with advanced work hardening, and the structural strength and work hardening increase the strength. The battery can 1 is formed of the long side wall 2 and the short side wall 3 adjacent to the corner wall 7.
このとき、短辺側壁３、底壁４、長辺Ｒ壁５、短辺Ｒ壁６、コーナー壁７の強度と比較して、長辺側壁２は、板厚が薄いため強度は弱いが、柔軟性はある。したがって、電池缶１に内圧を掛けた場合、長辺側壁２に延びが発生し、撓むことができる。 At this time, compared with the strength of the short side wall 3, bottom wall 4, long side R wall 5, short side R wall 6, corner wall 7, the long side wall 2 has a low strength because it is thin, There is flexibility. Therefore, when internal pressure is applied to the battery can 1, the long side wall 2 is extended and can be bent.
長辺側壁２において、中央部の延びが最も大きく、長辺Ｒ壁５、コーナー壁７に近づく程、延びが少なくなる。すなわち、長辺側壁２の中心部に向かう程、延びが大きくなる。よって、電池缶１の内部に内圧がかかっても、板材が撓むことによりその負荷を軽減させることができる。 In the long side wall 2, the central portion has the largest extension, and the longer the side wall 2 and the corner wall 7, the smaller the extension. That is, the extension increases toward the center of the long side wall 2. Therefore, even if an internal pressure is applied to the inside of the battery can 1, the load can be reduced by bending the plate material.
しかしながら、長辺Ｒ壁５、短辺Ｒ壁６、コーナー壁７に近い程、板材の延びが小さく、長辺Ｒ壁５、短辺Ｒ壁６、及びコーナー壁７と、長辺側壁２との境界線上で内圧による負荷に抵抗することができない。そのため、内圧を板材の延びにより吸収することができず、その境界線部分において板材の破壊が起こる。 However, the closer to the long side R wall 5, the short side R wall 6 and the corner wall 7, the smaller the extension of the plate material, and the long side R wall 5, the short side R wall 6 and the corner wall 7, and the long side wall 2 It cannot resist the load due to internal pressure on the boundary line. Therefore, the internal pressure cannot be absorbed by the extension of the plate material, and the plate material is broken at the boundary portion.
特に、長辺Ｒ壁５とコーナー壁７とに囲まれた長辺側壁２の隅部分（図３（Ｂ）参照）は、著しい加工硬化で側壁の伸びが期待できない部分である。この部分は、各壁の板厚の違いと加工硬化のアンバランスから、内圧に対する耐力の断層が顕著に現れ、その部分から破壊が始まる。図２、図３では、そのような破壊された部分を符号２０で示している。 In particular, the corner portion of the long side wall 2 surrounded by the long side R wall 5 and the corner wall 7 (see FIG. 3B) is a portion where the side wall cannot be expected to stretch due to significant work hardening. In this part, due to the difference in the plate thickness of each wall and the work-hardening imbalance, a fault of resistance to internal pressure appears prominently, and fracture starts from that part. 2 and 3, such a broken portion is denoted by reference numeral 20.
電池缶１に内圧をかけて、電池缶１の破壊に至るまでのメカニズムを検証した結果、長辺Ｒ壁５及び短辺Ｒ壁６と、長辺側壁２、短辺側壁３、及びコーナー壁７との間の鉢巻状の境界領域（以下、Ａ線という）上で 破壊することが確認された。 As a result of verifying the mechanism up to destruction of the battery can 1 by applying internal pressure to the battery can 1, the long side R wall 5 and the short side R wall 6, the long side wall 2, the short side wall 3, and the corner wall It was confirmed that it broke down on the headband-shaped boundary region (hereinafter referred to as “A line”) between the two.
この破壊現象の最大の原因は、先に述べた様に、内圧に対する耐力の断層（Ａ線）に起因している。なお、長辺側壁２及び短辺側壁３と、長辺Ｒ壁５及び短辺Ｒ壁６の内側の表面を形成している曲面の曲率半径ｒを単に大きくしても、上記の問題は解決できない。 As described above, the greatest cause of this destruction phenomenon is due to a fault (A line) of resistance to internal pressure. The above problem can be solved by simply increasing the curvature radius r of the curved surfaces forming the inner surfaces of the long side wall 2 and the short side wall 3 and the long side R wall 5 and the short side R wall 6. Can not.
上記の課題に鑑み、本発明では、内圧に対する耐力を向上させた電池缶を提供する。 In view of the above problems, the present invention provides a battery can having improved proof strength against internal pressure.
本発明にかかる、有底筒状の電池缶は、該底部の内表面の端部と前記筒部の内表面の端部とが隣接するコーナー部分の内径が、該底部より離れるに従い、大きくなることを特徴とする。また、前記電池缶の形状は、有底角筒状であることを特徴とする。 In the bottomed cylindrical battery can according to the present invention, the inner diameter of the corner portion where the end portion of the inner surface of the bottom portion and the end portion of the inner surface of the cylinder portion are adjacent to each other increases as the distance from the bottom portion increases. It is characterized by that. The shape of the battery can is a bottomed rectangular tube.
また、前記電池缶の材質は、アルミニウムであることを特徴とする。また、前記内径を成す表面の形状は、テーパー形状または略テーパー形状であることを特徴とする。また、発明にかかる電池缶は、電池の外装部分に用いられる。 The material of the battery can is aluminum. Moreover, the shape of the surface which comprises the said internal diameter is a taper shape or a substantially taper shape, It is characterized by the above-mentioned. Moreover, the battery can according to the invention is used for an exterior part of a battery.
本発明にかかる、プレス加工にて一枚の金属板から有底筒状に成型される電池缶の製造方法は、該底部の内表面の端部と前記筒部の内表面の端部とが隣接するコーナー部分の内径が、該底部より離れるに従い、大きくなるように前記プレス加工を行うことを特徴とする。 According to the present invention, a method of manufacturing a battery can molded into a bottomed cylindrical shape from a single metal plate by press working has an end portion on the inner surface of the bottom portion and an end portion on the inner surface of the tube portion. The press working is performed so that the inner diameter of the adjacent corner portion becomes larger as the inner diameter portion is separated from the bottom portion.
本発明を用いることにより、内圧に対する耐力を向上させることができるので、安全弁の作動圧より低い圧力で電池缶が破壊するのを防止することができる。 By using the present invention, it is possible to improve the yield strength against the internal pressure, and thus it is possible to prevent the battery can from being destroyed at a pressure lower than the operating pressure of the safety valve.
本実施形態では、電池缶１の破壊を改善するために、内圧に対する耐力の断層に注目し、その断層の線上の局所に集中する力を分散させる。
図４は、本実施形態における電池缶の底部のコーナー付近の外観の一部を拡大した斜視図である。同図は、図３（Ｂ）の部分に対応する部分である。従来の鉢巻状のＡ線の上方に、略平行に鉢巻状のＢ線を設ける。このＡ線及びＢ線の詳細は、図５で説明する。
In the present embodiment, in order to improve the destruction of the battery can 1, attention is paid to a fault withstand strength against internal pressure, and the force concentrated locally on the line of the fault is dispersed.
FIG. 4 is an enlarged perspective view of a part of the appearance near the corner of the bottom of the battery can according to the present embodiment. This figure corresponds to the part of FIG. Above the conventional headband-shaped A line, a headband-shaped B line is provided substantially in parallel. Details of the A and B lines will be described with reference to FIG.
図５は、図４の拡大部分Ｍの断面図である。図５は、図２に対応するものである。従来の鉢巻状のＡ線から上方に所定の高さにある鉢巻状の境界領域を、以下ではＢ線という。そして、Ａ線とＢ線の同鉢の間に耐力の断層を和らげる緩和領域Ｄを設ける。 FIG. 5 is a cross-sectional view of the enlarged portion M of FIG. FIG. 5 corresponds to FIG. The headband-shaped boundary region at a predetermined height above the conventional headband-shaped A line is hereinafter referred to as B-line. And the relaxation area | region D which softens a proof stress fault is provided between the same bowls of A line and B line.
この緩和領域Ｄの特徴は、内側壁の曲面を形成している曲率半径の成す円の中心Ｃrを、図２の中心Ｃrの位置より電池缶１の内部方向に移動させてその曲面を形成し、その移動した曲面の端部（Ａ線）と長辺側壁２の端部（Ｂ線）とをテーパー２７で結んだり、または大きく滑らかな曲面２８を形成するように大きい曲率半径で結んだりしたことである。 The feature of this relaxation region D is that the center C r of the circle formed by the radius of curvature forming the curved surface of the inner wall is moved from the position of the center C r in FIG. The end of the curved surface that has been formed (line A) and the end of the long side wall 2 (line B) are connected with a taper 27, or connected with a large radius of curvature so as to form a large and smooth curved surface 28. It ’s a bad thing.
すなわち、長辺側壁２の板厚を連続的に変化させて、長辺Ｒ壁５及び短辺Ｒ壁６とつなげるために、Ａ線部分からＢ線部分の間の内側方向にある壁面を、テーパー２７または連続的な滑らかな曲面２８（略テーパー形状）とする。このようにすることで、耐力の断層に集中してかかっていた負荷をそのテーパー２７全面またはその曲面２８の全面に分散させることができるので、領域Ｄから発生する破壊現象を改善される。 That is, in order to continuously change the plate thickness of the long side wall 2 and connect it to the long side R wall 5 and the short side R wall 6, the wall surface in the inner direction between the A line part and the B line part, The taper 27 or the continuous smooth curved surface 28 (substantially tapered shape) is used. By doing so, the load concentrated on the proof fault can be dispersed over the entire surface of the taper 27 or the entire surface of the curved surface 28, so that the destruction phenomenon generated from the region D is improved.
なお、Ｒ＝１．０［ｍｍ］、ｒ＝０．６［ｍｍ］、長辺側壁２の板厚＝０．２［ｍｍ］、短辺側壁３の板厚＝０．２［ｍｍ］、底壁４の板厚＝０．５［ｍｍ］の電池缶１の場合、Ａ−Ｂ間の距離（符号２５）（以下、テーパーの高さという）は１．５〜２．０［ｍｍ］、符号２６で示す幅（以下、テーパーの幅という）は０．０８〜０．１［ｍｍ］の範囲内にあるのが好ましい。 R = 1.0 [mm], r = 0.6 [mm], plate thickness of the long side wall 2 = 0.2 [mm], plate thickness of the short side wall 3 = 0.2 [mm], In the case of the battery can 1 having a thickness of the bottom wall 4 of 0.5 [mm], the distance A-B (reference numeral 25) (hereinafter referred to as the taper height) is 1.5 to 2.0 [mm]. The width indicated by reference numeral 26 (hereinafter referred to as taper width) is preferably in the range of 0.08 to 0.1 [mm].
次に、本実施形態における電池缶の製造方法について説明する。本実施形態における電池缶は、プレス成型により成型される。プレス成形とは、ポンチとダイス等の一対の型（多くの場合、金型）で金属板を挟圧して所望の形状に成形することをいう。 Next, the manufacturing method of the battery can in this embodiment is demonstrated. The battery can in this embodiment is molded by press molding. Press molding refers to forming a desired shape by sandwiching a metal plate with a pair of molds (in many cases, a mold) such as a punch and a die.
まず、円（楕円）形状の厚さ０．５ｍｍのアルミニウム板材を、一対の絞りポンチとダイスとを用いてプレス加工し、有底角筒形状の外装缶を成形する。このとき、プレス加工を複数回行うことにより、徐々に成型していくが、最後の数回（例えば、最後の１回、２回）のプレス成型において、絞りポンチの先端の形状に所定の傾斜（または滑らかな球面）を設けておく。そうすることにより、その絞りポンチでプレスされ、その傾斜により加圧された部分には、テーパー２７（または曲面２８）が形成されている。 First, a circular (elliptical) -shaped aluminum plate having a thickness of 0.5 mm is pressed using a pair of drawing punches and a die to form a bottomed rectangular tube-shaped outer can. At this time, it is gradually formed by performing press processing a plurality of times, but in the last several times (for example, the last one time or twice), the shape of the tip of the drawing punch is inclined to a predetermined inclination. (Or a smooth spherical surface) is provided. By doing so, the taper 27 (or curved surface 28) is formed in the part pressed with the aperture punch and pressed by the inclination.
このようにすることで、プレス加工にて一枚の金属板から有底筒状に成型される電池缶１は、その底部（４）の内表面の端部と前記筒部（２または３）の内表面の端部とが隣接して曲面を有するコーナー部分（緩和領域Ｄと曲率半径ｒの曲面より成る）の内径（２７または２８）が、該底部より離れるに従い、大きくなる。このようにすることで、耐力の断層に集中してかかっていた負荷をそのテーパー２７の全面またはその曲面２８の全面に分散させることができるので、領域Ｄから発生する破壊現象を改善される。 By doing in this way, the battery can 1 molded into a bottomed cylindrical shape from a single metal plate by press working, the end of the inner surface of the bottom (4) and the cylindrical portion (2 or 3) An inner diameter (27 or 28) of a corner portion (comprising a curved surface having a relaxation region D and a radius of curvature r) adjacent to the end portion of the inner surface increases as the distance from the bottom portion increases. By doing so, the load concentrated on the proof fault can be distributed over the entire surface of the taper 27 or the entire surface of the curved surface 28, so the destruction phenomenon generated from the region D is improved.
以下では、テーパー２７を使用した電池缶に関しての実施例について説明する。 Below, the Example regarding the battery can which uses the taper 27 is described.
以下では、本実施形態にかかる電池缶と従来設計製品との破壊強度の比較を行った。
図６は、本実施例における破壊強度測定方法を説明するための図である。本実施例では、縦４１［ｍｍ］、横４０［ｍｍ］、高さ４．９［ｍｍ］のアルミニウム製の電池缶を用いた。同図に示すように、ストロー状の加圧口３１の付いた金属性カバー３０を電池缶１の上部の開口部に溶接することにより、その電池缶１を密閉する。次に、その密閉された電池缶１に増幅圧縮エア３２を加圧口３１より注入して、電池缶１の内圧を上昇させ、電池缶１が破壊した時の圧力を測定する。
Below, the fracture strength of the battery can according to the present embodiment and the conventionally designed product was compared.
FIG. 6 is a diagram for explaining the breaking strength measuring method in the present embodiment. In this example, an aluminum battery can having a length of 41 [mm], a width of 40 [mm], and a height of 4.9 [mm] was used. As shown in the figure, the battery can 1 is sealed by welding a metallic cover 30 with a straw-shaped pressurizing port 31 to the opening at the top of the battery can 1. Next, the amplified compressed air 32 is injected into the sealed battery can 1 from the pressurizing port 31, the internal pressure of the battery can 1 is increased, and the pressure when the battery can 1 is broken is measured.
図７は、本実施例における電池缶の測定条件を示す。本実施例では、Ｒ＝１．０［ｍｍ］、ｒ＝０．６［ｍｍ］、短辺側壁３の板厚が０．３［ｍｍ］、コーナー壁７の板厚が０．４［ｍｍ］、長辺側壁２の板厚が０．２［ｍｍ］の本実施形態にかかる電池缶及び従来製品を用いて比較測定を行った。さらに、本実施形態にかかる電池缶は、テーパーの高さ０．０８［ｍｍ］、テーパーの幅１．６８［ｍｍ］からなるテーパー２７が底部４のコーナー付近に形成されている。 FIG. 7 shows the measurement conditions of the battery can in this example. In this embodiment, R = 1.0 [mm], r = 0.6 [mm], the plate thickness of the short side wall 3 is 0.3 [mm], and the plate thickness of the corner wall 7 is 0.4 [mm]. The comparative measurement was performed using the battery can according to the present embodiment in which the plate thickness of the long side wall 2 is 0.2 [mm] and the conventional product. Further, in the battery can according to the present embodiment, a taper 27 having a taper height of 0.08 [mm] and a taper width of 1.68 [mm] is formed near the corner of the bottom portion 4.
この比較は本実施形態にかかる電池缶と、従来製品とをそれぞれ５回ずつ試行した。この結果を、表１に示す。なお、従来製品については参考として長辺側壁２の板厚が０．２２［ｍｍ］としたものを記載している。 In this comparison, the battery can according to the present embodiment and the conventional product were tried five times each. The results are shown in Table 1. In addition, about the conventional product, what the plate | board thickness of the long side wall 2 was 0.22 [mm] is described as reference.
表１より、従来製品（板厚０．２［ｍｍ］）の破壊強度は、平均値８．３［Ｋｇｆ／ｃｍ2］であるのに対して、本実施形態にかかる電池缶では平均値２８．５［Ｋｇｆ／ｃｍ2］である。したがって、本実施形態にかかる電池缶の方が約３．４倍の内圧にも耐えられることが分かる。 From Table 1, the breaking strength of the conventional product (plate thickness 0.2 [mm]) is an average value of 8.3 [Kgf / cm 2 ], whereas in the battery can according to this embodiment, the average value is 28. 0.5 [Kgf / cm 2 ]. Therefore, it can be seen that the battery can according to the present embodiment can withstand about 3.4 times the internal pressure.
そして、両者の破壊した箇所を比較してみても、従来製品は底部付け根が破壊されているのに対して、本実施形態にかかる電池缶は胴体部が破壊されており、内圧に対する耐力の断層部分の破壊は生じていない。これは、板厚を０．２２［ｍｍ］とより厚くした従来製品に匹敵する結果である。 And even if comparing the part where both were destroyed, the bottom part of the conventional product is destroyed, whereas the battery can according to this embodiment has the body part destroyed, and the fault of resistance to internal pressure The destruction of the part has not occurred. This is a result comparable to a conventional product in which the plate thickness is increased to 0.22 [mm].
なお、内圧による胴体部の破壊は、材料の延び現象の後に発生する。胴体部の材料の延びは、比較的高く安定していて、計算により耐力の予測を行うことができる。一方、底部付け根の破壊は、集中的な内圧を受けることにより生じるため、胴体部の破壊強度に比較し、その破壊強度は著しく低く、予測することが困難である（予測不能致命的破壊）。 Note that the destruction of the body portion due to the internal pressure occurs after the material elongation phenomenon. The elongation of the material of the body part is relatively high and stable, and the yield strength can be predicted by calculation. On the other hand, since the destruction of the bottom root occurs due to intensive internal pressure, its breaking strength is significantly lower than the breaking strength of the trunk, and it is difficult to predict (unpredictable fatal failure).
この結果より、本実施形態にかかる電池缶は、従来製品と同等の外形及び板厚であるにもかかわらず、従来品よりも破壊強度は向上していることを確認することができる。
なお、本発明は上記の実施形態に何ら限定されるものでなく、本発明の目的を変更しない範囲で適宜変更して実施することが可能である。また、実施例ではアルミニウム製の電池缶を用いたが、材質はこれに限定されず、例えば、金、銀、銅、白金、真鍮、鉄、ステンレス、チタン、ニッケル、マグネシウム、セラミック、ガラス等の無機材料またはこれらの組み合わせでもよい。また、材質は、エンジニアプラスチック等の高分子有機材料、またはこれらの組み合わせでもよい。また、電池缶に限定しなくても、内圧がかかり、かつ、スリム化及び軽量化の必要のあるあらゆる成型品に利用することができる。
From this result, it can be confirmed that the battery can according to the present embodiment has an improved fracture strength as compared with the conventional product, although the outer shape and the plate thickness are the same as those of the conventional product.
In addition, this invention is not limited to said embodiment at all, It is possible to implement by changing suitably in the range which does not change the objective of this invention. Moreover, although the battery can made of aluminum was used in the examples, the material is not limited to this, for example, gold, silver, copper, platinum, brass, iron, stainless steel, titanium, nickel, magnesium, ceramic, glass, etc. It may be an inorganic material or a combination thereof. The material may be a polymer organic material such as engineer plastic, or a combination thereof. Moreover, even if it does not limit to a battery can, it can utilize for all the molded articles which require internal pressure and need slimming and weight reduction.
また、本実施形態では、有底角筒状の電池缶について説明したが、これに限定されず、例えば、円筒状、多角筒状の電池缶に用いてもよい。
また、本実施例では、テーパー２７に関する実施例について説明したが、曲面２８の場合でも同様の効果を得ることができる。
In the present embodiment, the bottomed rectangular cylindrical battery can has been described. However, the present invention is not limited to this, and for example, it may be used for a cylindrical or polygonal battery can.
Further, in the present embodiment, the embodiment relating to the taper 27 has been described, but the same effect can be obtained even in the case of the curved surface 28.
以上より、本発明を用いることにより、内圧に対する耐力を向上させることができるので、安全弁の作動圧より低い圧力で電池缶が破壊するのを防止することができる。また、本発明は、年々、性能の向上が求められ、板厚が薄くなる傾向にある電池缶に対して、益々有効な工法デザインである。 As described above, by using the present invention, it is possible to improve the proof strength against the internal pressure, and thus it is possible to prevent the battery can from being destroyed at a pressure lower than the operating pressure of the safety valve. In addition, the present invention is a design method that is more effective for battery cans that are required to improve performance year by year and whose thickness tends to be thin.
１ 電池缶
２ 長辺側壁
３ 短辺側壁
４ 底壁
５ 長辺Ｒ壁
６ 短辺Ｒ壁
７ コーナー壁
２７ テーパー
２８ 滑らかな曲面
DESCRIPTION OF SYMBOLS 1 Battery can 2 Long side wall 3 Short side wall 4 Bottom wall 5 Long side R wall 6 Short side R wall 7 Corner wall 27 Taper 28 Smooth curved surface
Claims (6)
該底部の内表面の端部と前記筒部の内表面の端部とが隣接して曲面を有するコーナー部分の内径が、該底部より離れるに従い、大きくなる
ことを特徴とする電池缶。 A bottomed cylindrical battery can,
A battery can characterized in that an inner diameter of a corner portion having a curved surface in which an end portion of the inner surface of the bottom portion and an end portion of the inner surface of the cylindrical portion are adjacent to each other increases as the distance from the bottom portion increases.
ことを特徴とする請求項１に記載の電池缶。 The battery can according to claim 1, wherein the shape of the battery can is a bottomed rectangular tube.
ことを特徴とする請求項１に記載の電池缶。 The battery can according to claim 1, wherein the material of the battery can is aluminum.
ことを特徴とする請求項１に記載の電池缶。 The battery can according to claim 1, wherein a shape of a surface forming the inner diameter is a tapered shape or a substantially tapered shape.
該底部の内表面の端部と前記筒部の内表面の端部とが隣接して曲面を有するコーナー部分の内径が、該底部より離れるに従い、大きくなるように前記プレス加工を行う
ことを特徴とする電池缶の製造方法。
A method of manufacturing a battery can that is formed into a bottomed cylindrical shape from a single metal plate by pressing,
The press working is performed such that an inner diameter of a corner portion having a curved surface is adjacent to an end portion of the inner surface of the bottom portion and an inner surface end portion of the cylindrical portion, and becomes larger as the distance from the bottom portion increases. A method for manufacturing a battery can.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006150038A JP4402076B2 (en) | 2006-05-30 | 2006-05-30 | Battery can |
| TW096116099A TW200814402A (en) | 2006-05-30 | 2007-05-07 | Battery can |
| KR1020070051336A KR100904833B1 (en) | 2006-05-30 | 2007-05-28 | Battery can |
| CNB2007101084038A CN100527475C (en) | 2006-05-30 | 2007-05-30 | Battery pot |
| HK08103479.6A HK1109502A1 (en) | 2006-05-30 | 2008-03-28 | Battary can |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006150038A JP4402076B2 (en) | 2006-05-30 | 2006-05-30 | Battery can |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2007323845A true JP2007323845A (en) | 2007-12-13 |
| JP4402076B2 JP4402076B2 (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006150038A Active JP4402076B2 (en) | 2006-05-30 | 2006-05-30 | Battery can |
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| Country | Link |
|---|---|
| JP (1) | JP4402076B2 (en) |
| KR (1) | KR100904833B1 (en) |
| CN (1) | CN100527475C (en) |
| HK (1) | HK1109502A1 (en) |
| TW (1) | TW200814402A (en) |
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| JP2014120470A (en) * | 2012-12-18 | 2014-06-30 | Samsung Sdi Co Ltd | Secondary battery |
| JP2015210930A (en) * | 2014-04-25 | 2015-11-24 | 株式会社豊田自動織機 | Battery pack |
| US10483501B2 (en) | 2014-08-13 | 2019-11-19 | Samsung Sdi Co., Ltd. | Secondary battery |
| WO2016043017A1 (en) * | 2014-09-18 | 2016-03-24 | 株式会社神戸製鋼所 | Quadrangular cell case for vehicle cell and method for manufacturing same |
| JP2016066583A (en) * | 2014-09-18 | 2016-04-28 | 株式会社神戸製鋼所 | Square battery case for on-vehicle battery, and manufacturing method thereof |
| JP2016085912A (en) * | 2014-10-28 | 2016-05-19 | 株式会社Ｇｓユアサ | Power storage device |
| JP2016171021A (en) * | 2015-03-13 | 2016-09-23 | 日立マクセル株式会社 | Battery |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1109502A1 (en) | 2008-06-06 |
| KR100904833B1 (en) | 2009-06-25 |
| KR20070115652A (en) | 2007-12-06 |
| TW200814402A (en) | 2008-03-16 |
| TWI351122B (en) | 2011-10-21 |
| JP4402076B2 (en) | 2010-01-20 |
| CN101083311A (en) | 2007-12-05 |
| CN100527475C (en) | 2009-08-12 |
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