JP5552391B2 - Square secondary battery - Google Patents

Square secondary battery Download PDF

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JP5552391B2
JP5552391B2 JP2010172286A JP2010172286A JP5552391B2 JP 5552391 B2 JP5552391 B2 JP 5552391B2 JP 2010172286 A JP2010172286 A JP 2010172286A JP 2010172286 A JP2010172286 A JP 2010172286A JP 5552391 B2 JP5552391 B2 JP 5552391B2
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battery
power generation
generation element
element group
core
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JP2012033396A (en
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典男 石塚
竜治 河野
不二夫 平野
正也 堀野
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Vehicle Energy Japan Inc
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Hitachi Vehicle Energy 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
    • 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

Description

本発明は、発電要素群を蓋によって支持する構造の角型二次電池に関する。   The present invention relates to a prismatic secondary battery having a structure in which a power generation element group is supported by a lid.

車両駆動用二次電池の構造としては、発電要素群となる正極、負極双方のシートと、正負極板間の絶縁用のセパレータと電解液とが、金属製や樹脂製の密閉角型容器に収容され、発電要素群の両極とそれぞれ接続された外部端子を設けたものが広く知られている。   The structure of a secondary battery for driving a vehicle includes a sheet for both positive and negative electrodes, a separator for insulation between the positive and negative electrode plates, and an electrolyte solution in a sealed square container made of metal or resin. A device provided with an external terminal that is housed and connected to both electrodes of the power generation element group is widely known.

従来の角型二次電池は、発電要素群を、正負極電極板を介して電池蓋によって機械的に吊持し、かつ、正負極電極板を電池蓋に対して電気的に絶縁している（例えば、特許文献１）。   In a conventional prismatic secondary battery, a power generation element group is mechanically suspended by a battery lid via positive and negative electrode plates, and the positive and negative electrode plates are electrically insulated from the battery lid. (For example, patent document 1).

特開２００１−３０４７５号JP 2001-30475 A

従来の角型二次電池は、外部からの振動により、発電要素群が、電池蓋と正負極電極板接合部を支点にブランコのように振動する。その結果、二次電池の寿命に影響を及ぼすおそれがある。   In a conventional prismatic secondary battery, a power generation element group vibrates like a swing with a battery lid and a positive / negative electrode plate joint as a fulcrum by external vibration. As a result, the life of the secondary battery may be affected.

（１）請求項１の発明による角型二次電池は、正極と、負極と、前記正極と前記負極間に介在されるセパレータとを含んだ電池シートを発電要素芯に捲いて形成した発電要素群と、前記発電要素群を収納するための扁平直方体状の電池缶と、前記電池缶の開口部を封止する電池蓋と、前記発電要素群を前記電池蓋に吊持する吊持部材とを備え、前記発電要素芯には、前記電池缶の対向する内面に向かって突出する芯延長部が設けられ、前記芯延長部は前記内面に接していることを特徴とする。
（２）請求項２の発明による角型二次電池は、正極と、負極と、前記正極と前記負極間に介在されるセパレータとを含んだ電池シートを、発電要素芯に捲いて形成した発電要素群と、前記発電要素群を収納するための扁平直方体状の電池缶と、前記電池缶の開口部を封止する電池蓋と、前記発電要素群を前記電池蓋に吊持する吊持部材とを備え、前記発電要素芯には、前記電池缶の対向する内面に向かって突出する芯延長部が設けられ、前記内面には、前記芯延長部に係合するガイドが設けられていることを特徴とする。 (1) A prismatic secondary battery according to the invention of claim 1 is a power generation element formed by winding a battery sheet including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode around a power generation element core. A flat rectangular parallelepiped battery can for housing the power generation element group, a battery lid for sealing the opening of the battery can, and a suspension member for suspending the power generation element group on the battery lid The power generation element core is provided with a core extension portion protruding toward the inner surface facing the battery can, and the core extension portion is in contact with the inner surface.
(2) The prismatic secondary battery according to the invention of claim 2 is a power generation in which a battery sheet including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is wound around a power generation element core. An element group, a flat rectangular battery can for housing the power generation element group, a battery lid for sealing an opening of the battery can, and a suspension member for suspending the power generation element group on the battery lid The power generating element core is provided with a core extension that protrudes toward the opposing inner surface of the battery can, and the inner surface is provided with a guide that engages with the core extension. It is characterized by .

本発明によれば、二次電池に作用する振動が電池寿命に影響を及ぼすおそれがない。   According to the present invention, there is no possibility that vibrations acting on the secondary battery affect the battery life.

本発明による角型二次電池の第１実施形態を示す透視斜視図。1 is a perspective view showing a first embodiment of a prismatic secondary battery according to the present invention. FIG. 図１における発電要素群のための正極電極を示す斜視図。The perspective view which shows the positive electrode for the electric power generation element group in FIG. 図１における発電要素群のための負極電極を示す斜視図。The perspective view which shows the negative electrode for the electric power generation element groups in FIG. 図１における発電要素群のための電池シートを示す斜視図。The perspective view which shows the battery sheet for the electric power generation element groups in FIG. 図１における発電要素群のための発電要素芯を示す斜視図。The perspective view which shows the electric power generation element core for the electric power generation element group in FIG. 図１における発電要素群を示す分解斜視図。The disassembled perspective view which shows the electric power generation element group in FIG. 図１における発電要素群と正負極接続板との接続状態を示す斜視図。The perspective view which shows the connection state of the electric power generation element group in FIG. 1, and a positive / negative electrode connection board. 図７の構成に電池蓋を接続した電池内構造を示す斜視図。The perspective view which shows the internal structure of a battery which connected the battery cover to the structure of FIG. 本発明による角型二次電池の第２実施形態における電池缶およびガイドを示す斜視図。The perspective view which shows the battery can and guide in 2nd Embodiment of the square secondary battery by this invention. 第２実施形態の発電要素芯を示す斜視図。The perspective view which shows the electric power generation element core of 2nd Embodiment. 本発明による角型二次電池の第３実施形態における電池缶およびガイドを示す平面図。The top view which shows the battery can and guide in 3rd Embodiment of the square secondary battery by this invention. 第３実施形態の発電要素芯を示す斜視図。The perspective view which shows the electric power generation element core of 3rd Embodiment. 本発明による角型二次電池の第４実施形態におけるガイドを示す平面図。The top view which shows the guide in 4th Embodiment of the square secondary battery by this invention. 第４実施形態における電池缶およびガイドを示す横断面図。The cross-sectional view which shows the battery can and guide in 4th Embodiment. 本発明による角型二次電池の第５実施形態を示す透視斜視図。The perspective view which shows 5th Embodiment of the square secondary battery by this invention.

本発明による角型二次電池の実施形態を図面を参照して説明する。   An embodiment of a prismatic secondary battery according to the present invention will be described with reference to the drawings.

［第１実施形態］
図１に示すように、角型二次電池は、一端に開口部１９Ｍを有する扁平直方体状の電池缶１９と、電池缶１９内に収納された発電要素群１０と、開口部１９Ｍを封止する電池蓋１４とを備える。電池缶１９は、開口部１９Ｍと対向する底面１９Ｒｍと、表裏で対向する一対の幅広面１９ＲＭと、左右で対向する一対の幅狭面１９Ｓとにより扁平直方体形状の容器を形成している。 [First Embodiment]
As shown in FIG. 1, the rectangular secondary battery has a flat rectangular battery can 19 having an opening 19M at one end, a power generation element group 10 accommodated in the battery can 19, and an opening 19M sealed. And a battery lid 14 to be provided. The battery can 19 forms a flat rectangular container by a bottom surface 19Rm facing the opening 19M, a pair of wide surfaces 19RM facing the front and back, and a pair of narrow surfaces 19S facing left and right.

発電要素群１０は、電池缶１９の底面１９Ｒｍおよび幅広面１９ＲＭに平行な捲回軸を有する発電要素芯８と、その外周りに捲回された正負極電極１ａ、４ａ（図２、図３）とを備えている。発電要素群１０は捲回厚さが圧縮され、電池缶１９に対応した扁平形状である。   The power generation element group 10 includes a power generation element core 8 having a winding axis parallel to the bottom surface 19Rm and the wide surface 19RM of the battery can 19, and positive and negative electrodes 1a and 4a wound around the outer periphery thereof (FIGS. 2 and 3). ). The power generation element group 10 has a flat shape corresponding to the battery can 19 with a wound thickness being compressed.

発電要素群１０には、正負極電極板１１、１２が溶接部１３において溶接され、正負極電極板１１、１２は、電気絶縁体１５を介して、電池蓋１４に取り付けられている。正極電極板１１、電気絶縁体１５には、正極電極端子１７が挿通され、負極電極板１２、電気絶縁体１５には、負極電極端子１８が挿通されており、正負極電極端子１７、１８は電池蓋１４の両面から、電気絶縁体１５を介してナット１６によって締め付けされている。   Positive and negative electrode plates 11 and 12 are welded to the power generation element group 10 at a welded portion 13, and the positive and negative electrode plates 11 and 12 are attached to the battery lid 14 via an electrical insulator 15. A positive electrode terminal 17 is inserted into the positive electrode plate 11 and the electrical insulator 15, a negative electrode terminal 18 is inserted into the negative electrode plate 12 and the electrical insulator 15, and the positive and negative electrode terminals 17 and 18 are The battery lid 14 is fastened by a nut 16 via an electrical insulator 15 from both sides.

このような構成を採用した二次電池において、発電要素群１０は、正負極電極板１１、１２を介して電池蓋１４によって機械的に吊持され、かつ、正負極電極板１１、１２は電池蓋１４に対して電気的に絶縁されている。   In the secondary battery adopting such a configuration, the power generation element group 10 is mechanically suspended by the battery lid 14 via the positive and negative electrode plates 11 and 12, and the positive and negative electrode plates 11 and 12 are batteries. It is electrically insulated from the lid 14.

発電要素芯８には、捲回軸方向両端部に芯延長部９が設けられ、各芯延長部９は左右の側面１９Ｓの内面に密着している。これによって、発電要素群１０の振動が抑制される。   The power generation element core 8 is provided with core extensions 9 at both ends in the winding axis direction, and each core extension 9 is in close contact with the inner surfaces of the left and right side surfaces 19S. Thereby, the vibration of the power generation element group 10 is suppressed.

［製造方法］
本実施形態の角型二次電池は、以下の工程によって製造される。 [Production method]
The square secondary battery of this embodiment is manufactured by the following steps.

［正極電極形成工程］
図２に示すように、まず、アルミニウム薄膜の正極材料１の両面の一部に活物質２を塗布して正極電極１ａを形成し、塗布されていない領域を、正極活物質未塗布領域３とする。
なお、図２は、正極電極１ａの構造を説明するための図であり、正極電極１ａは長尺シートとして形成されている。 [Positive electrode formation process]
As shown in FIG. 2, first, an active material 2 is applied to a part of both surfaces of a positive electrode material 1 of an aluminum thin film to form a positive electrode 1 a, and an uncoated region is defined as a positive electrode active material uncoated region 3. To do.
FIG. 2 is a view for explaining the structure of the positive electrode 1a, and the positive electrode 1a is formed as a long sheet.

［負極電極形成工程］
図３に示すように、銅薄膜の負極材料４に活物質５を塗布して、負極電極４ａを形成し、塗布されていない領域を負極活物質未塗布領域６とする。
なお、図３は、負極電極４ａの構造を説明するための図であり、負極電極４ａは長尺シートとして形成されている。 [Negative electrode forming step]
As shown in FIG. 3, an active material 5 is applied to a negative electrode material 4 of a copper thin film to form a negative electrode 4 a, and an uncoated region is defined as a negative electrode active material uncoated region 6.
FIG. 3 is a view for explaining the structure of the negative electrode 4a, and the negative electrode 4a is formed as a long sheet.

［電池シート作成工程］
図４に示すように、正極電極１ａ、負極電極４ａをセパレータ７で挟み電池シート２３を作製する。図４も図２や図３と同様に、電池シート２３の構造を説明するための図であり、電池シート２３は長尺シートとして形成されている。図４の符号Ｗは電池シート２３の幅を表し、電池シート２３は幅Ｗの長尺シートである。また、幅Ｗは、電池缶１９の幅広面１９ＲＭの幅、換言すると側面１９Ｓ間の距離よりも短い寸法である。 [Battery sheet creation process]
As shown in FIG. 4, the battery sheet 23 is produced by sandwiching the positive electrode 1a and the negative electrode 4a between separators 7. FIG. 4 is also a view for explaining the structure of the battery sheet 23 as in FIGS. 2 and 3, and the battery sheet 23 is formed as a long sheet. The symbol W in FIG. 4 represents the width of the battery sheet 23, and the battery sheet 23 is a long sheet having a width W. The width W is a dimension shorter than the width of the wide surface 19RM of the battery can 19, in other words, the distance between the side surfaces 19S.

［発電要素群作成工程］
図５に示すように、発電要素芯８は、絶縁性の素材で製作された平板を工字状に形成して構成されている。発電要素芯８は、電池シート２３の幅Ｗ（図４）と略等しく捲回軸方向に延びる長さＬの短片部８Ａと、短片部８Ａの反対側の長片部８Ｂとを備える。短片部８Ａと長片部８Ｂは、短片部８Ａの長さよりも幅狭の連結部８Ｃによって連結され、芯延長部９は長片部８Ｂの両端に設けられている。 [Power generation element group creation process]
As shown in FIG. 5, the power generating element core 8 is configured by forming a flat plate made of an insulating material into a letter shape. The power generating element core 8 includes a short piece portion 8A having a length L that extends in the winding axis direction substantially equal to the width W (FIG. 4) of the battery sheet 23, and a long piece portion 8B opposite to the short piece portion 8A. The short piece portion 8A and the long piece portion 8B are connected by a connecting portion 8C that is narrower than the length of the short piece portion 8A, and the core extension portions 9 are provided at both ends of the long piece portion 8B.

図６に示すように、発電要素芯８の短片部８Ａおよび長片部８Ｂの外側を廻るように電池シート２３を芯８に巻き付けることによって発電要素群１０を製作する。各芯延長部９は電池シート２３の端面から捲回軸の左右方向に突出している。長片部８Ｂの長さは、電池缶１９の左右の側面１９Ｓの間の寸法に等しく形成されている。したがって、発電要素群１０が電池缶１９内に収納されたとき、芯延長部９の両端面が左右の側面１９Ｓの内面に密着するように、長片部８Ｂの長さが設定されている。   As shown in FIG. 6, the power generation element group 10 is manufactured by winding the battery sheet 23 around the core 8 so as to go around the short piece portion 8 </ b> A and the long piece portion 8 </ b> B of the power generation element core 8. Each core extension 9 protrudes from the end surface of the battery sheet 23 in the left-right direction of the winding axis. The length of the long piece portion 8B is formed to be equal to the dimension between the left and right side surfaces 19S of the battery can 19. Therefore, when the power generation element group 10 is housed in the battery can 19, the length of the long piece portion 8 </ b> B is set so that both end surfaces of the core extension portion 9 are in close contact with the inner surfaces of the left and right side surfaces 19 </ b> S.

［電池内構造形成工程］
図７に示すように、発電要素群１０の正極活物質未塗布領域３、負極活物質未塗布領域６と、正極電極板１１、負極電極板１２とを超音波溶接により溶接接続１３において溶着する。 [Battery structure formation process]
As shown in FIG. 7, the positive electrode active material uncoated region 3, the negative electrode active material uncoated region 6, the positive electrode plate 11, and the negative electrode plate 12 of the power generation element group 10 are welded at a weld connection 13 by ultrasonic welding. .

さらに、図８に示すように、正極電極板１１と正極電極端子１７とを、また、負極電極板１２と負極電極端子１８とを電気絶縁体１５を介しつつナット１６によってそれぞれ連結し、正負極電極板１１、１２を電池蓋１４に固定する。これによって、発電要素群１０を、電池蓋１４によって吊持した電池内構造２４が形成される。   Further, as shown in FIG. 8, the positive electrode plate 11 and the positive electrode terminal 17 are connected to each other, and the negative electrode plate 12 and the negative electrode terminal 18 are connected to each other by a nut 16 with an electric insulator 15 interposed therebetween. The electrode plates 11 and 12 are fixed to the battery lid 14. Thereby, the battery internal structure 24 in which the power generation element group 10 is suspended by the battery lid 14 is formed.

［二次電池完成工程］
発電要素群１０を開口部１９Ｍから電池缶１９内に収納する。このとき、芯延長部９の端面が側面１９Ｓの内面に接しながら発電要素群１０を底面１９Ｒｍに向けて挿入する。電池蓋１４をレーザービーム溶接によって電池缶１９に溶着することにより開口部１９Ｍを封止する。電池缶１９内に電解液（図示省略）を注液口から注入する。注液口をその後、封止する。 [Secondary battery completion process]
The power generation element group 10 is accommodated in the battery can 19 through the opening 19M. At this time, the power generation element group 10 is inserted toward the bottom surface 19Rm while the end surface of the core extension 9 is in contact with the inner surface of the side surface 19S. The opening 19M is sealed by welding the battery lid 14 to the battery can 19 by laser beam welding. An electrolytic solution (not shown) is injected into the battery can 19 from the injection port. The injection port is then sealed.

発電要素群１０の振動は、発電要素群１０と電池缶１９の間に隙間が存在するために起こるものであり、左右に延在する芯延長部９が電池缶１９の左右側面１９Ｓの内面に密着されているので、電池缶１９の幅広方向の発電要素群１０の振動を抑制することができる。   The vibration of the power generation element group 10 occurs because there is a gap between the power generation element group 10 and the battery can 19, and the core extension portion 9 extending to the left and right is formed on the inner surfaces of the left and right side surfaces 19 </ b> S of the battery can 19. Since they are in close contact, vibration of the power generation element group 10 in the wide direction of the battery can 19 can be suppressed.

なお、側面１９Ｓに沿った電池缶奥行き方向の振動については、芯延長部９の端面と側面１９Ｓの内面との摩擦により抑制される。   The vibration in the battery can depth direction along the side surface 19S is suppressed by friction between the end surface of the core extension 9 and the inner surface of the side surface 19S.

また、芯８は絶縁性材料で製作されているから、芯８は電池シート２３と絶縁されている。金属製材料で製作した電池缶１９が正負いずれかの電位を持つ場合でも、電池缶１９と芯８は絶縁されるので、電気的に支障を来すこともない。   Further, since the core 8 is made of an insulating material, the core 8 is insulated from the battery sheet 23. Even when the battery can 19 made of a metal material has a positive or negative potential, the battery can 19 and the core 8 are insulated, so there is no electrical problem.

［第２実施形態］
本発明による角型二次電池の第２実施形態を、図９を参照して説明する。なお、図中、第１実施形態と同一もしくは相当部分には同一符号を付し、相違点を主に説明する。 [Second Embodiment]
A second embodiment of the prismatic secondary battery according to the present invention will be described with reference to FIG. In the figure, the same or corresponding parts as those in the first embodiment are designated by the same reference numerals, and the differences will be mainly described.

第２実施形態は、第１実施形態の構成に加え、芯延長部９を支持するガイド２０を設けたものである。ガイド２０の素材は絶縁性材料でも、導電性材料でもよいが、芯８を導電性材料で製作する場合は、ガイド２０を絶縁性材料で製作する必要がある。この場合、金属製の芯８は正極部材１ａ，４ａで絶縁される。   In the second embodiment, in addition to the configuration of the first embodiment, a guide 20 for supporting the core extension 9 is provided. The material of the guide 20 may be an insulating material or a conductive material. However, when the core 8 is manufactured from a conductive material, the guide 20 needs to be manufactured from an insulating material. In this case, the metal core 8 is insulated by the positive electrode members 1a and 4a.

図９に示すように、角型二次電池の電池缶１９には、側面１９Ｓの内側に、側面１９Ｓの略全長に渡ってガイド２０が挿入されている。ガイド２０には、側面１９Ｓの幅方向略中央で、底面１９Ｒｍに直交する方向に延びる溝２５が形成され、溝２５内には、芯延長部９が挿入される。   As shown in FIG. 9, a guide 20 is inserted into the battery can 19 of the square secondary battery over the substantially entire length of the side surface 19 </ b> S inside the side surface 19 </ b> S. The guide 20 is formed with a groove 25 extending substantially in the center in the width direction of the side surface 19S and extending in a direction perpendicular to the bottom surface 19Rm, and the core extension 9 is inserted into the groove 25.

溝２５は断面長方形状であり、その両端部は開放されている。これによって、芯延長部９を、開口部１９Ｍ側から挿入することができ、電池内構造２４の組み立てが容易である。   The groove 25 has a rectangular cross section, and both ends thereof are open. Thereby, the core extension part 9 can be inserted from the opening part 19M side, and the assembly of the battery internal structure 24 is easy.

芯延長部９は溝２５の底面２５Ｂに密着し、第１実施形態と同様に、側面１９Ｓに直交する方向について振動が抑制される。さらに、溝２５は、幅広面１９ＲＭと直交する電池缶奥行き方向についても芯延長部９の振動を抑制する。   The core extension portion 9 is in close contact with the bottom surface 25B of the groove 25, and the vibration is suppressed in the direction orthogonal to the side surface 19S, as in the first embodiment. Further, the groove 25 suppresses the vibration of the core extension 9 also in the battery can depth direction perpendicular to the wide surface 19RM.

なお、芯延長部９が溝２５に係合することによって発電要素群１０ひいては電池内構造２４の振動が抑制されるので、ガイド２０、すなわち溝２５の最小延在長さは、芯延長部９が係合する範囲、換言すると、芯延長部９の電池缶深さ方向の寸法でよい。第２実施の形態では、図９に示すように、ガイド２０は、電池缶１９の底部、すなわち、底面１９Ｒｍまで延在していない。   Since the vibration of the power generation element group 10 and the battery internal structure 24 is suppressed by engaging the core extension 9 with the groove 25, the minimum extension length of the guide 20, that is, the groove 25 is set to the core extension 9. May be the range in which the core extension portion 9 is in the depth direction of the battery can. In the second embodiment, as shown in FIG. 9, the guide 20 does not extend to the bottom of the battery can 19, that is, the bottom surface 19 </ b> Rm.

ただし、図９に示すように、ガイド２０を開口部１９Ｍまで延在させると、電池内構造２４を電池缶１９内に収容する際の作業性が良い。   However, as shown in FIG. 9, when the guide 20 is extended to the opening 19 </ b> M, workability when the battery internal structure 24 is accommodated in the battery can 19 is good.

［第３実施形態］
本発明による角型二次電池の第３実施形態を、図１１、図１２を参照して説明する。なお、図中、第１実施形態と同一もしくは相当部分には同一符号を付し、相違点を主に説明する。 [Third Embodiment]
A third embodiment of the prismatic secondary battery according to the present invention will be described with reference to FIGS. In the figure, the same or corresponding parts as those in the first embodiment are designated by the same reference numerals, and the differences will be mainly described.

第３実施形態は、第２実施形態における断面長方形状の溝を、断面Ｔ字状とし、芯延長部９の形状をＴ字状としたものである。   In the third embodiment, the groove having a rectangular cross section in the second embodiment has a T-shaped cross section, and the core extension portion 9 has a T-shaped shape.

図１２に示すように、発電要素芯８は、１対の長片部８Ｂを連結部８Ｃで連結してなり、各長片部８Ｂの先端には、Ｔ字状の芯延長部９Ｔが設けられている。   As shown in FIG. 12, the power generating element core 8 is formed by connecting a pair of long piece portions 8B with a connecting portion 8C, and a T-shaped core extension portion 9T is provided at the tip of each long piece portion 8B. It has been.

図１１に示すように、電池缶１９には、側面１９Ｓの内側にガイド２１が挿入されている。ガイド２１には、側面１９Ｓの幅方向略中央で底面１９Ｒｍに直交する方向に延びる溝２８が形成され、溝２８内には、芯延長部９Ｔが嵌入される。溝２８は断面Ｔ字状である。   As shown in FIG. 11, a guide 21 is inserted into the battery can 19 inside the side surface 19S. The guide 21 is formed with a groove 28 extending substantially in the center in the width direction of the side surface 19S and extending in a direction perpendicular to the bottom surface 19Rm, and the core extension 9T is fitted into the groove 28. The groove 28 has a T-shaped cross section.

断面Ｔ字状の溝２８と、Ｔ字状の芯延長部９Ｔとの嵌合によって、発電要素群１０は、側面１９Ｓに直交する方向の振動が抑制される。また、溝２８は、幅広面１９ＲＭと直交する電池缶奥行き方向についても芯延長部９の振動を抑制する。   By fitting the groove 28 having a T-shaped cross section with the T-shaped core extension 9T, the power generation element group 10 is suppressed from vibrating in a direction perpendicular to the side surface 19S. Moreover, the groove | channel 28 suppresses the vibration of the core extension part 9 also about the battery can depth direction orthogonal to the wide surface 19RM.

第２実施形態同様、溝２８は、開口部１９Ｍ側の端部が開放されており、芯延長部９Ｔを開口部１９Ｍ側から挿入することができる。従って、電池内構造２４の組み立てが容易である。
第３実施形態は、第２実施形態の効果に加え、側面１９Ｓに直交する方向の振動抑制効果を向上するという効果が得られる。 As in the second embodiment, the groove 28 has an open end on the opening 19M side, and the core extension 9T can be inserted from the opening 19M side. Therefore, assembly of the battery internal structure 24 is easy.
In the third embodiment, in addition to the effect of the second embodiment, the effect of improving the vibration suppression effect in the direction orthogonal to the side surface 19S is obtained.

［第４実施形態］
本発明による角型二次電池の第４実施形態を、図１３、図１４を参照して説明する。なお、図中、第１実施形態と同一もしくは相当部分には同一符号を付し、相違点を主に説明する。 [Fourth Embodiment]
A square secondary battery according to a fourth embodiment of the present invention will be described with reference to FIGS. In the figure, the same or corresponding parts as those in the first embodiment are designated by the same reference numerals, and the differences will be mainly described.

第４実施形態は、第２実施形態の溝２５を設けたガイド２０に代えて、芯延長部９の端部が挿入される孔２７を設けたガイド２６を使用するものである。   The fourth embodiment uses a guide 26 provided with a hole 27 into which an end of the core extension 9 is inserted, instead of the guide 20 provided with the groove 25 of the second embodiment.

図１３、図１４に示すように、側面１９Ｓの内側に、側面１９Ｓの略全長に渡って、ガイド２６が挿入されている。ガイド２６には、側面１９Ｓの幅方向略中央で、芯延長部９の断面に対応した断面の穴（または凹部）２７が穿設されている。   As shown in FIGS. 13 and 14, a guide 26 is inserted inside the side surface 19 </ b> S over substantially the entire length of the side surface 19 </ b> S. In the guide 26, a hole (or recess) 27 having a cross section corresponding to the cross section of the core extension 9 is formed at approximately the center in the width direction of the side surface 19S.

発電要素芯８の芯延長部９は穴２７に挿入され、発電要素群１０は、側面１９Ｓに沿った全方向について、拘束される。また、芯延長部９は、穴２７の底面２７Ｂに接しており、側面１９Ｓに直交する方向についても発電要素群１０は拘束されている。   The core extension 9 of the power generation element core 8 is inserted into the hole 27, and the power generation element group 10 is restrained in all directions along the side surface 19S. Further, the core extension portion 9 is in contact with the bottom surface 27B of the hole 27, and the power generating element group 10 is also restrained in the direction orthogonal to the side surface 19S.

これによって、発電要素群１０は全方向について、振動が抑制されている。   As a result, the power generation element group 10 is suppressed from vibrating in all directions.

なお、組立に際しては、発電要素群１０を電池缶１９に収容する前に、発電要素群１０の両端面から突出する芯延長部９をガイド２６に係合し、その後、ガイド２６を側面１９Ｓの内面に沿って滑動させて発電要素群１０を電池缶１９に収容することができる。   When assembling, before accommodating the power generation element group 10 in the battery can 19, the core extension 9 protruding from both end faces of the power generation element group 10 is engaged with the guide 26, and then the guide 26 is attached to the side surface 19 </ b> S. The power generation element group 10 can be accommodated in the battery can 19 by sliding along the inner surface.

第４実施形態は、第２実施形態の効果に加え、底面１９Ｒｍに直交する方向の振動抑制効果を向上するという効果が得られる。   In the fourth embodiment, in addition to the effect of the second embodiment, the effect of improving the vibration suppressing effect in the direction orthogonal to the bottom surface 19Rm is obtained.

［第５実施形態］
本発明による角型二次電池の第５実施形態を、図１５を参照して説明する。なお、図中、第１実施形態と同一もしくは相当部分には同一符号を付し、相違点を主に説明する。 [Fifth Embodiment]
A fifth embodiment of the prismatic secondary battery according to the present invention will be described with reference to FIG. In the figure, the same or corresponding parts as those in the first embodiment are designated by the same reference numerals, and the differences will be mainly described.

第５実施形態は、第１実施形態の構成に加え、発電要素群１０に、電池缶１９の幅広面１９ＲＭの内面に接する振動止めフィルム２２を設けたものである。発電要素群１０の表面はセパレータで覆われているから、振動止めフィル２２はセパレータの表面に接着すればよい。   In the fifth embodiment, in addition to the configuration of the first embodiment, the power generation element group 10 is provided with an anti-vibration film 22 that contacts the inner surface of the wide surface 19RM of the battery can 19. Since the surface of the power generation element group 10 is covered with the separator, the vibration stopper fill 22 may be adhered to the surface of the separator.

図１５に示すように、発電要素群１０には、幅広面１９ＲＭに対向する表面に、超音波溶接部１３に近接して、振動止めフィルム２２が貼付されている。振動止めフィルム２２は、幅広面１９ＲＭの内面に密着しており、発電要素群１０と幅広面１９ＲＭとの隙間が無くなり、幅広面１９ＲＭに直交する方向の振動が抑制される。   As shown in FIG. 15, the vibration generating film 22 is affixed to the power generation element group 10 on the surface facing the wide surface 19RM in the vicinity of the ultrasonic weld 13. The vibration stop film 22 is in close contact with the inner surface of the wide surface 19RM, and there is no gap between the power generation element group 10 and the wide surface 19RM, and vibration in a direction perpendicular to the wide surface 19RM is suppressed.

すなわち、第５実施形態は、第１実施形態の効果に加え、幅広面１９ＲＭに直交する方向の振動抑制効果が高いという効果を奏する。   That is, the fifth embodiment has an effect that the vibration suppressing effect in the direction orthogonal to the wide surface 19RM is high in addition to the effect of the first embodiment.

振動止めフィルム２２の位置は、発電要素群１０と幅広面１９ＲＭとの隙間を埋める任意の位置に配置することができる。超音波溶接部１３は、正負極電極板１１、１２に対する負荷（発電要素群１０）の作用点であるので、超音波溶接部１３に近接した箇所に振動止めフィルム２２を貼付するのが、最も効果的に振動を抑制することができる。   The position of the vibration stop film 22 can be arranged at any position that fills the gap between the power generation element group 10 and the wide surface 19RM. Since the ultrasonic welded portion 13 is the point of action of the load (power generation element group 10) on the positive and negative electrode plates 11, 12, the vibration preventing film 22 is most affixed to a location close to the ultrasonic welded portion 13. Vibration can be effectively suppressed.

［変形例］
（１）第１実施形態では、芯延長部９の端面を側面１９Ｓの内面に密着させて発電要素群１０の振動を抑制した。しかしながら、芯延長部９の端面を側面１９Ｓの内面に接着してもよい。すなわち、芯延長部９を側面１９Ｓの内面に固定してもよい。芯延長部９を固定することにより、側面１９Ｓに沿った方向についても強固に振動が抑制され、側面１９Ｓに直交する方向についても振動抑制効果が高まる。 [Modification]
(1) In 1st Embodiment, the end surface of the core extension part 9 was stuck to the inner surface of the side surface 19S, and the vibration of the electric power generation element group 10 was suppressed. However, the end surface of the core extension 9 may be bonded to the inner surface of the side surface 19S. That is, the core extension 9 may be fixed to the inner surface of the side surface 19S. By fixing the core extension 9, vibration is strongly suppressed in the direction along the side surface 19 </ b> S, and the vibration suppression effect is enhanced in the direction orthogonal to the side surface 19 </ b> S.

（２）第１実施形態では、発電要素芯８に１個の長片部８Ｂを設け、この長片部８Ｂの両端に芯延長部９を設けたが、短片部８Ａに代えて長片部８Ｂを採用し、両長片部８Ｂの両端に芯延長部９を設けてもよい。これによって、振動抑制効果は向上する。 (2) In the first embodiment, the power generation element core 8 is provided with one long piece portion 8B, and the core extension portions 9 are provided at both ends of the long piece portion 8B. However, instead of the short piece portion 8A, a long piece portion is provided. 8B may be adopted and the core extension portions 9 may be provided at both ends of both long piece portions 8B. Thereby, the vibration suppressing effect is improved.

（３）第２実施形態では、ガイド２０を底面１９Ｒｍに接しない長さに設定したが、底面１９Ｒｍに接する長さとしてもよい。 (3) In the second embodiment, the guide 20 is set to a length that does not contact the bottom surface 19Rm, but may be a length that contacts the bottom surface 19Rm.

（４）第４実施の形態に長片部８Ｂを２個設ける変形例を適用する場合には、ガイド２６に穴２７を２個設ければ、さらに振動抑制効果が向上する。 (4) When applying the modification which provides two long piece parts 8B in 4th Embodiment, if the two holes 27 are provided in the guide 26, a vibration suppression effect will improve further.

（５）第５実施形態では、発電要素芯８の芯延長部８Ｂと振動止めフィルム２２の両者によって、振動を防止したが、芯延長部９を省略し、振動止めフィルム２２のみによって、発電要素群１０の振動を抑制することも可能である。この場合、振動止めフィルム２２の表面を摩擦係数の高い材料で覆うようにすると効果的である。 (5) In the fifth embodiment, the vibration is prevented by both the core extension portion 8B of the power generation element core 8 and the vibration stop film 22, but the core extension portion 9 is omitted and only the vibration stop film 22 is used to generate the power generation element. It is also possible to suppress the vibration of the group 10. In this case, it is effective to cover the surface of the vibration stop film 22 with a material having a high friction coefficient.

以上の説明は一例であり、本発明は実施の形態や変形例に限定されない。したがって、発電要素群１０を蓋１４に吊持する正負電極板１１，１２の形状、構造も実施の形態になんら限定されない。正負電極端子１７，１８の形状、構造も実施の形態に限定されない。   The above description is an example, and the present invention is not limited to the embodiment and the modification. Therefore, the shape and structure of the positive and negative electrode plates 11 and 12 that suspend the power generation element group 10 on the lid 14 are not limited to the embodiment. The shape and structure of the positive and negative electrode terminals 17 and 18 are not limited to the embodiment.

以上の実施の形態や変形例を適宜組み合わせてもよい。   You may combine the above embodiment and modification suitably.

なお、電池缶１９に発電要素群１０を直設挿入せず、袋状の絶縁ケースで電池缶１９の内面を覆うようにした二次電池にも本発明を適用できる。第１実施の形態では、芯延長部９の端面は絶縁ケースを介して電池缶１９の内面に接するようにする。第２、第３，第４実施の形態では、ガイド２０、２１、２６を絶縁性材料で製作し、絶縁ケースの一部に芯延長部が挿通する開口、孔を形成すればよい。   The present invention can also be applied to a secondary battery in which the power generation element group 10 is not directly inserted into the battery can 19 and the inner surface of the battery can 19 is covered with a bag-like insulating case. In the first embodiment, the end surface of the core extension 9 is in contact with the inner surface of the battery can 19 via the insulating case. In the second, third, and fourth embodiments, the guides 20, 21, and 26 may be made of an insulating material, and an opening and a hole through which the core extension portion is inserted may be formed in a part of the insulating case.

１：正極材料
１ａ：正極電極
２、５：活物質
３：正極活物質未塗布領域
４：負極材料
４ａ：負極電極
６：負極活物質未塗布領域
７：セパレータ
８：発電要素芯
８Ａ：短片部
８Ｂ：長片部
８Ｃ：連結部
９、９Ｔ：芯延長部
１０：発電要素群
１１：正極電極板
１２：負極電極板
１３：超音波溶接部
１４：電池蓋
１５：電気絶縁体
１６：ナット
１７：正極電極端子
１８：負極電極端子
１９：電池缶
１９Ｍ：開口部
１９Ｒｍ：底面
１９ＲＭ：幅広面
１９Ｓ：側面
２０、２１、２６：ガイド
２２：振動止めフィルム
２３：電池シート
２４：電池内構造
２５、２８：溝
２５Ｂ：底面
２７：穴（または凹部）
２７Ｂ：底面
1: positive electrode material 1a: positive electrode 2, 5: active material 3: positive electrode active material uncoated region 4: negative electrode material 4a: negative electrode 6: negative electrode active material uncoated region 7: separator 8: power generating element core 8A: short piece 8B: Long piece portion 8C: Connection portion 9, 9T: Core extension portion 10: Power generation element group 11: Positive electrode plate 12: Negative electrode plate 13: Ultrasonic welding portion 14: Battery lid 15: Electrical insulator 16: Nut 17 : Positive electrode terminal 18: Negative electrode terminal 19: Battery can 19M: Opening 19Rm: Bottom surface 19RM: Wide surface 19S: Side surfaces 20, 21, 26: Guide 22: Vibration stopper film 23: Battery sheet 24: Battery internal structure 25, 28: Groove 25B: Bottom 27: Hole (or recess)
27B: Bottom

Claims (6)

正極と、負極と、前記正極と前記負極間に介在されるセパレータとを含んだ電池シートを発電要素芯に捲いて形成した発電要素群と、
前記発電要素群を収納するための扁平直方体状の電池缶と、
前記電池缶の開口部を封止する電池蓋と、
前記発電要素群を前記電池蓋に吊持する吊持部材とを備え、
前記発電要素芯には、前記電池缶の対向する内面に向かって突出する芯延長部が設けられ、前記芯延長部は前記内面に接していることを特徴とする角型二次電池。 A power generation element group formed by winding a battery sheet including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode around a power generation element core;
A flat rectangular parallelepiped battery can for housing the power generation element group;
A battery lid for sealing the opening of the battery can;
A suspension member for suspending the power generation element group on the battery lid,
The prismatic secondary battery according to claim 1, wherein the power generating element core is provided with a core extension portion protruding toward an inner surface facing the battery can, and the core extension portion is in contact with the inner surface. 正極と、負極と、前記正極と前記負極間に介在されるセパレータとを含んだ電池シートを、発電要素芯に捲いて形成した発電要素群と、
前記発電要素群を収納するための扁平直方体状の電池缶と、
前記電池缶の開口部を封止する電池蓋と、
前記発電要素群を前記電池蓋に吊持する吊持部材とを備え、
前記発電要素芯には、前記電池缶の対向する内面に向かって突出する芯延長部が設けられ、前記内面には、前記芯延長部に係合するガイドが設けられていることを特徴とする角型二次電池。 A power generation element group formed by winding a battery sheet including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode around a power generation element core;
A flat rectangular parallelepiped battery can for housing the power generation element group;
A battery lid for sealing the opening of the battery can;
A suspension member for suspending the power generation element group on the battery lid,
The power generation element core is provided with a core extension portion that protrudes toward the inner surface facing the battery can, and the inner surface is provided with a guide that engages with the core extension portion. Square secondary battery. 請求項２記載の角型二次電池において、
前記ガイドには、前記電池缶の底面に直交する方向に延びる溝が形成され、前記芯延長部は前記溝に係合されていることを特徴とする角型二次電池。 The prismatic secondary battery according to claim 2,
The guide has a groove extending in a direction orthogonal to the bottom surface of the battery can, and the core extension is engaged with the groove. 請求項３記載の角型二次電池において、
前記溝はＴ字状であり、前記芯延長部は前記Ｔ字状と相補形状に形成されていることを特徴とする角型二次電池。 The prismatic secondary battery according to claim 3,
2. The square secondary battery according to claim 1, wherein the groove is T-shaped, and the core extension is formed in a shape complementary to the T-shape. 請求項２記載の角型二次電池において、
前記ガイドには穴が形成され、前記芯延長部は前記穴に係合されていることを特徴とする角型二次電池。 The prismatic secondary battery according to claim 2,
A square secondary battery, wherein a hole is formed in the guide, and the core extension is engaged with the hole. 請求項１記載の角型二次電池において、
前記発電要素群の表面には、前記電池缶内面と前記表面との隙間を埋める振動止めフィルムが設けられていることを特徴とする角型二次電池。 The prismatic secondary battery according to claim 1,
A prismatic secondary battery, wherein a vibration preventing film is provided on a surface of the power generation element group to fill a gap between the inner surface of the battery can and the surface.
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