JP5263928B2 - Square battery - Google Patents

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JP5263928B2
JP5263928B2 JP2007326003A JP2007326003A JP5263928B2 JP 5263928 B2 JP5263928 B2 JP 5263928B2 JP 2007326003 A JP2007326003 A JP 2007326003A JP 2007326003 A JP2007326003 A JP 2007326003A JP 5263928 B2 JP5263928 B2 JP 5263928B2
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current collector
plate
positive electrode
negative electrode
collector plate
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JP2009146867A (en
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薫 佐藤
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Envision AESC Energy Devices 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

Description

本発明は、主として、リチウムイオン二次電池などの高エネルギー密度を有する二次電池の大電流充放電用電源としての用途に適した角型電池に関するものである。   The present invention mainly relates to a prismatic battery suitable for use as a power source for charging and discharging a large current of a secondary battery having a high energy density such as a lithium ion secondary battery.

リチウムイオン二次電池などの、正極集電体の両面に正極活物質を塗布した正極板と、負極集電体の両面に負極活物質を塗布した負極板とが、セパレータを介して積層されてなる極板群には、正極板と負極板とをセパレータを介して交互に積層させ極板群を形成する積層型と、正極板と負極板とをセパレータを介して渦巻き状に積層し極板群を形成する巻回型とがある。一般にはこれら極板群を電解液と共に電池缶に収納し、正極板、負極板の適所に、集電タブや集電リードの片端を接続し、他端を正極端子、負極端子に接続して電気を取り出す構造として電池が構成されている。   A positive electrode plate in which a positive electrode active material is applied to both surfaces of a positive electrode current collector, such as a lithium ion secondary battery, and a negative electrode plate in which a negative electrode active material is applied to both surfaces of a negative electrode current collector are stacked via a separator. In the electrode plate group, a positive electrode plate and a negative electrode plate are alternately stacked via a separator to form a stacked plate, and a positive electrode plate and a negative electrode plate are spirally stacked via a separator. There are winding types that form groups. Generally, these electrode plate groups are housed in a battery can together with an electrolyte, and one end of a current collecting tab or current collecting lead is connected to an appropriate position of the positive electrode plate and the negative electrode plate, and the other end is connected to a positive electrode terminal and a negative electrode terminal. A battery is configured as a structure for extracting electricity.

上記の構造では、正極板、負極板の一箇所から集電タブや集電リードを介して電気を取り出しているので、大電流で充放電を行う場合でも、面積の小さい集電タブや集電リードに電流が流れるだけであるため、電気抵抗が大きくなり発熱することや、電極反応が不均一に発生することが懸念される。その結果、電池の充放電特性が低下することから、長期間に亘る信頼性の向上が要望されている。   In the above structure, electricity is taken out from one place of the positive electrode plate and the negative electrode plate via the current collecting tab or current collecting lead. Therefore, even when charging / discharging with a large current, the current collecting tab or current collecting device with a small area is used. Since only the current flows through the lead, there is a concern that the electrical resistance increases and heat is generated, and the electrode reaction occurs unevenly. As a result, the charge / discharge characteristics of the battery are lowered, and thus there is a demand for improvement in reliability over a long period of time.

また、集電タブや集電リードを電池缶内に納めるにあたり、極性の異なる集電タブや集電リード相互の接触、あるいは集電タブや集電リードと極性の異なる極板との接触等によって、内部短絡が起こる可能性がある。これらの内部短絡を防ぐためには、絶縁板を組み込む等の構造が必要となり、体積容積密度を向上させることが困難となっている。   Also, when the current collecting tab or current collecting lead is placed in the battery can, the current collecting tabs or current collecting leads with different polarities, or the current collecting tab or current collecting lead with the electrode plate with different polarity, etc. Internal short circuit may occur. In order to prevent these internal short circuits, a structure such as an insulating plate is required, and it is difficult to improve the volumetric volume density.

一方、例えば特許文献１に開示されているように、集電タブや集電リードを用いず、極板群の両側面から集電体を突出させ、直接集電板に接続するタブレス方式が提案されている。この方式は、正極板、負極板それぞれの極板全体から均一に集電でき、大電流の充放電に適しているという特徴がある。また、集電タブや集電リードの折りたたみや絶縁板を組み込むなどの工程が不要となり、構造を単純化できるという利点がある。   On the other hand, as disclosed in Patent Document 1, for example, a tabless method is proposed in which current collectors are protruded from both side surfaces of the electrode plate group and directly connected to the current collector plates without using current collecting tabs or current collecting leads. Has been. This method is characterized by being able to collect current uniformly from the entire electrode plate of each of the positive electrode plate and the negative electrode plate, and suitable for charging and discharging a large current. Further, there is an advantage that the structure can be simplified because steps such as folding the current collecting tab and current collecting lead and incorporating an insulating plate are not required.

タブレス方式は、極性群の両側面から突出した集電体同士がそれぞれ集電板に直接接続されている構造であるが、側面に極性の異なる集電体が露出したままの状態では、その露出部分が異極の集電体に接触することで内部短絡が発生する可能性がある。また、集電体と集電板とを密着させ接続する場合に、集電体と集電板の接触面積が小さいと接続箇所の強度が不十分となり、弱い衝撃でも接続が壊れる恐れがある。集電体と集電板とを確実に接続するためには、集電体と集電板との接触面積を大きくする必要がある。   The tabless system is a structure in which current collectors protruding from both sides of the polar group are directly connected to the current collector plates, but if the current collectors of different polarity are left exposed, There is a possibility that an internal short circuit may occur when the part contacts a current collector with a different polarity. Further, when the current collector and the current collector plate are connected in close contact with each other, if the contact area between the current collector and the current collector plate is small, the strength of the connection portion becomes insufficient, and the connection may be broken even with a weak impact. In order to reliably connect the current collector and the current collector plate, it is necessary to increase the contact area between the current collector and the current collector plate.

特開２００２−１５１０４７号公報JP 2002-151047 A

本発明は、上述の問題を解決すべくなされたもので、その技術的課題は、内部短絡の発生を防止でき、且つ極板群の両側面から突出させた集電体と集電板を確実に接続し、安全性、信頼性の高い角型電池を提供することである。   The present invention has been made to solve the above-mentioned problems, and its technical problem is that it is possible to prevent the occurrence of an internal short circuit and to ensure the current collector and the current collector plate protruding from both side surfaces of the electrode plate group. To provide a prismatic battery with high safety and reliability.

本発明の角型電池は、正極集電体の両面に正極活物質を塗布した正極板と、負極集電体の両面に負極活物質を塗布した負極板とがセパレータを介して積層構造を形成した極板群を、電解液と共に電池缶に収納されてなる角型電池であって、前記極板群の両側面に接するように設けられた絶縁体と、前記正極集電体の端部と前記負極集電体の端部とが前記両側面から前記絶縁体を通して互いに逆方向に突出し、該突出した端部が同極同士で接合されて輪状に形成された集電体接合部と、前記集電体接合部にそれぞれ密着して接続された正極集電板および負極集電板であって、外部端子との導通を確保するための正極集電板および負極集電板と、を有することを特徴とする角型電池が得られる。この構造を採用することによって、異極の集電体相互の接触による内部短絡を防止でき、また、集電体と集電板との接触面積が大きくなり、確実な接合が得られる。 In the prismatic battery of the present invention, a positive electrode plate in which a positive electrode active material is applied to both surfaces of a positive electrode current collector and a negative electrode plate in which a negative electrode active material is applied to both surfaces of a negative electrode current collector form a laminated structure via a separator. the the electrode plate group, a prismatic cell comprising housed in a battery can together with an electrolyte, an insulator provided in contact with both sides of the electrode plate assembly, an end portion of the positive electrode current collector the negative electrode current collector and the end protruding in opposite directions to each other through the insulator from the both sides, the collector junction end issued projecting are formed on the ring are joined with the same poles, a positive electrode current collector plate and the negative electrode current collector plate that is connected in close contact to each of the current collector junction, having a positive electrode and negative electrode terminal plates to ensure conduction between the external terminal A square battery characterized by the above can be obtained. By adopting this structure, it is possible to prevent an internal short circuit due to contact between current collectors of different polarities, and the contact area between the current collector and the current collector plate is increased, so that reliable bonding can be obtained.

また、前記極板群両側面に設けた絶縁体に、前期集電板に向けて絶縁突起部を形成し、前記集電体接合部は、前記絶縁突起部を覆うように当接させることで、集電体と集電板との接続を保持することを特徴とする角型電池が得られる。   Further, an insulating protrusion is formed on the insulator provided on both side surfaces of the electrode plate group toward the current collector plate, and the current collector joint is brought into contact so as to cover the insulating protrusion. A prismatic battery characterized in that the connection between the current collector and the current collector plate is maintained.

また、前記集電板に前記集電体接合部を挟み込む手段を有する挟持部材を設置し、前記狭持部材に前記集電体接合部を挿入し挟み込んで固定することにより、集電体と集電板との接続を保持することを特徴とする角型電池が得られる。   In addition, a clamping member having means for sandwiching the current collector joint portion between the current collector plates is installed, and the current collector joint portion is inserted into the sandwiching member and sandwiched and fixed, thereby fixing the current collector and the current collector. A prismatic battery characterized by maintaining connection with the electric plate can be obtained.

また、前記集電板を櫛歯形状とし、前記集電体接合部と前記集電板とを交差させ、集電体と集電板との接続を保持することを特徴とする角型電池が得られる。   A rectangular battery characterized in that the current collector plate has a comb shape, the current collector junction and the current collector plate are crossed, and the connection between the current collector and the current collector plate is maintained. can get.

また、前記集電体接合部と前記集電板とを溶接にて接続したことを特徴とする角型電池が得られる。   Moreover, the square battery characterized by connecting the said collector collector part and the said current collector plate by welding is obtained.

本発明によれば、体積容積効率が高く大電流充放電に適したタブレス方式の角型電池において、内部短絡発生を防止できる構造で、かつ集電板と集電体とを確実に接続する、安全性、信頼性の高い角型電池を提供することができる。   According to the present invention, in a tabless type prismatic battery that is high in volumetric volume efficiency and suitable for large current charge / discharge, it has a structure that can prevent the occurrence of an internal short circuit, and reliably connects the current collector and the current collector, A prismatic battery with high safety and reliability can be provided.

以下、本発明の角型電池の一実施の形態のリチウムイオン二次電池について、図面を参照しながら詳細に説明するが、本発明はこれらの実施の形態に限定されるものではない。   Hereinafter, a lithium ion secondary battery according to an embodiment of the square battery of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to these embodiments.

図１は、本発明の第１の実施の形態に関わる角型電池の縦断面図である。この図では電池缶と電解液は省略されている。   FIG. 1 is a longitudinal sectional view of a prismatic battery according to the first embodiment of the present invention. In this figure, the battery can and the electrolyte are omitted.

正極板３は、アルミニウム製の正極集電体１の両面にリチウム含有遷移金属酸化物などの正極活物質２が塗布されたシートであり、負極板６は、銅製の負極集電体４の両面に黒鉛などの負極活物質５が塗布されたシートである。各極板の片端部には一定幅で両面に活物質を塗布せず、各極の集電体が露出した部分を設ける。   The positive electrode plate 3 is a sheet in which a positive electrode active material 2 such as a lithium-containing transition metal oxide is applied to both surfaces of an aluminum positive electrode current collector 1, and the negative electrode plate 6 is a both surfaces of a copper negative electrode current collector 4. The sheet is coated with a negative electrode active material 5 such as graphite. One end of each electrode plate is provided with a portion having a constant width and no active material applied on both sides, and exposing the current collector of each electrode.

積層型電池の場合は、上記正極板３と負極板６をセパレータ９を介して所定の数量になるように積層し極板群を形成する。また、巻回型電池の場合は、上記正極板３と負極板６をセパレータ９を介して渦巻状に所定の巻き数になるように巻きつけ極板群を形成する。このとき各極板の集電体が露出した端部は、正極、負極で互いに逆方向になるように配置する。セパレータ９の材質としては、例えばポリエチレン、ポリプロピレンなどのオレフィン系ポリマーや、ガラス繊維などからなる織布や不織布などを用いることができる。   In the case of a stacked battery, the positive electrode plate 3 and the negative electrode plate 6 are stacked through a separator 9 so as to have a predetermined quantity, thereby forming an electrode plate group. In the case of a wound battery, the positive electrode plate 3 and the negative electrode plate 6 are wound in a spiral shape with a separator 9 interposed therebetween to form a group of electrode plates. At this time, the end portions where the current collectors of the respective electrode plates are exposed are arranged so as to be opposite to each other in the positive electrode and the negative electrode. As a material of the separator 9, for example, an olefin polymer such as polyethylene or polypropylene, a woven fabric or a nonwoven fabric made of glass fiber, or the like can be used.

次いで、上記極板群の各極板の集電体が露出した端部を除く両側面に、絶縁体１０を形成し、各極板の集電体が露出した端部は、絶縁体１０から突出させるような構造とする。この構造により、絶縁体１０から突出した集電体突出部は、異極の極板と接触することが無く、内部短絡の発生を防止でき、より安全性、信頼性の高い電池を提供することが可能となる。絶縁体の材質としては、加熱やＵＶ照射により重合固化して得られるポリマー等が好適に用いられる。   Next, the insulator 10 is formed on both side surfaces of the electrode plate group excluding the end where the current collector of the electrode plate is exposed, and the end of the electrode plate where the current collector is exposed is separated from the insulator 10. The structure is made to protrude. With this structure, the current collector protrusion protruding from the insulator 10 does not come into contact with the electrode plate of a different polarity, can prevent the occurrence of an internal short circuit, and provide a battery with higher safety and reliability. Is possible. As a material of the insulator, a polymer obtained by polymerization and solidification by heating or UV irradiation is preferably used.

前述の集電体突出部は、同極同士で接合して輪状を形成し、この輪状の集電体接合部と正極集電板７、負極集電板８とをそれぞれ接続させる。このとき、集電体突出部の全面を輪状に接合し、集電体接合部を形成しても良いが、予め集電体突出部の一箇所または複数箇所を矩形状に切断加工しておき、この部分を同極同士で輪状に接合し、所定幅の集電体接合部を形成しても良い。   The current collector projections described above are joined at the same polarity to form a ring shape, and the ring-shaped current collector joint portion is connected to the positive electrode current collector plate 7 and the negative electrode current collector plate 8 respectively. At this time, the entire surface of the current collector protrusion may be joined in a ring shape to form the current collector joint, but one or more current collector protrusions are cut into a rectangular shape in advance. These portions may be joined in a ring shape with the same polarity to form a current collector joint portion having a predetermined width.

集電体接合部と集電板との接続は、抵抗溶接またはレーザ溶接などを施すことができるが、この際、接合部分の面積を大きくできるので、接合を強固、確実に保つことが可能である。   The connection between the current collector joint and the current collector plate can be performed by resistance welding or laser welding, but at this time, the area of the joint can be increased, so that the joint can be maintained firmly and securely. is there.

図２は、本発明の第２の実施の形態に関わる角型電池の要部の縦断面図である。この図は、正極集電板側の集電体接合部と極板群の一部を示したもので、その他の部分は省略しているが、正極側と負極側は同様の形態とすることができる。極板群側面の絶縁体に絶縁突起部１１を形成して、輪状に接合された集電体接合部を、その絶縁突起部１１を覆うように当接させる。この集電体接合部を正極集電板７に押し当て接続させる。この場合に、絶縁突起部１１が集電体接合部を支持する構造となるので、正極集電板７と正極集電体１とを容易に接続することが可能となる。なお、絶縁突起部１１の形状は図２に示したものに限定はせず、集電体接合部と集電板との接続を支持するものであれば、他の形状でも同様の効果が得られる。   FIG. 2 is a longitudinal cross-sectional view of the main part of the prismatic battery according to the second embodiment of the present invention. This figure shows the current collector joint on the positive electrode current collector plate side and a part of the electrode plate group, and other parts are omitted, but the positive electrode side and the negative electrode side have the same configuration. Can do. An insulating protrusion 11 is formed on the insulator on the side surface of the electrode plate group, and a current collector connecting portion bonded in a ring shape is brought into contact so as to cover the insulating protrusion 11. This current collector junction is pressed against and connected to the positive current collector plate 7. In this case, since the insulating protrusion 11 supports the current collector joint, the positive current collector 7 and the positive current collector 1 can be easily connected. The shape of the insulating protrusion 11 is not limited to that shown in FIG. 2, and the same effect can be obtained with other shapes as long as it supports the connection between the current collector joint and the current collector plate. It is done.

図３は、本発明の第３の実施の形態に関わる角型電池の集電板に設けた狭持部材の形状の一例を示す図で、図３（ａ）は狭持部材と集電体との接続形態を示す説明図で、図３（ｂ）は図３（ａ）を矢印１３の方向から見た説明図である。この図は、正極集電板側の極板群の一部を示したもので、その他の部分は省略しているが、正極側と負極側は同様の形態とすることができる。正極集電板７に狭持部材１２を設置し、この狭持部材１２に集電体同士の接合部分を挿入することにより、正極集電板７と正極集電体１とを接続、固定するものである。これによって、集電体接合部と正極集電板７との接続を強固かつ容易に行うことが可能となる。   FIG. 3 is a view showing an example of the shape of the holding member provided on the current collector plate of the prismatic battery according to the third embodiment of the present invention, and FIG. 3 (a) shows the holding member and the current collector. FIG. 3B is an explanatory view of FIG. 3A viewed from the direction of the arrow 13. This figure shows a part of the electrode plate group on the positive electrode current collector plate side, and other parts are omitted, but the positive electrode side and the negative electrode side can have the same configuration. The sandwiching member 12 is installed on the cathode current collector plate 7, and the junction between the current collectors is inserted into the sandwiching member 12, thereby connecting and fixing the cathode current collector plate 7 and the cathode current collector 1. Is. As a result, the connection between the current collector joint and the positive electrode current collector plate 7 can be made firmly and easily.

図４は、本発明の第３の実施の形態に関わる角型電池の集電板に設けた狭持部材の別の形状を示す説明図である。また狭持部材１２の形状は、これらに限定されるものではなく、集電体接合部の挟み込みが可能な機能を有する形状の狭持部材を集電板に設置することで、同様の効果が得られるものである。   FIG. 4 is an explanatory view showing another shape of the holding member provided on the current collector plate of the prismatic battery according to the third embodiment of the present invention. Further, the shape of the holding member 12 is not limited to these, and a similar effect can be obtained by installing a holding member having a shape capable of sandwiching the current collector joint portion on the current collector plate. It is obtained.

図５は、本発明の第４の実施の形態に関わる角型電池の要部を示す図で、図５（ａ）は、櫛歯形状集電板と集電体との接続形態を示す説明図で、図５（ｂ）は図５（ａ）の集電体を矢印１４の方向から見た説明図である。この図は、正極集電板側の極板群の一部を示したもので、その他の部分は省略しているが、正極側と負極側は同様の形態とすることができる。   FIG. 5 is a diagram showing a main part of a prismatic battery according to the fourth embodiment of the present invention, and FIG. 5 (a) is a diagram showing a connection configuration between a comb-shaped current collector plate and a current collector. FIG. 5B is an explanatory view of the current collector of FIG. 5A viewed from the direction of the arrow 14. This figure shows a part of the electrode plate group on the positive electrode current collector plate side, and other parts are omitted, but the positive electrode side and the negative electrode side can have the same configuration.

図６は、本発明の第４の実施の形態に関わる角型電池の集電板の形状を示す図で、図６（ａ）は櫛歯状の集電板を示す図、図６（ｂ）は長方形状の孔を設けた集電板を示す図、図６（ｃ）は櫛歯状に対向するように配置された集電板を示す図、図６（ｄ）は角孔が形成された集電板を示す図である。   FIG. 6 is a diagram showing the shape of a current collecting plate of a prismatic battery according to the fourth embodiment of the present invention, FIG. 6 (a) is a diagram showing a comb-shaped current collecting plate, and FIG. ) Is a diagram showing a current collector plate provided with a rectangular hole, FIG. 6C is a diagram showing a current collector plate arranged so as to be opposed in a comb-tooth shape, and FIG. 6D is a diagram showing a square hole formed. It is a figure which shows the made current collecting plate.

図５において、図６（ａ）の櫛歯形状の集電体を使用した場合を例にとって説明をする。正極集電板７ａを櫛歯形状とし、集電体接合部と正極集電板７ａとが交差した構造をとっている。このとき、正極集電体１は予め櫛歯形状の正極集電板７ａに交差させておき、その後、正極集電体１を輪状に接合し、集電体接合部を正極集電板７ａを覆うように密接させる。この構造により、集電板と集電体との接触面積を十分確保して接続することが可能であることに加え、正極集電板７ａは隙間が開いた形状であるので、電解液注入をより容易に行うことができる。   In FIG. 5, the case where the comb-shaped current collector of FIG. 6A is used will be described as an example. The positive electrode current collector plate 7a is comb-shaped, and the current collector junction and the positive electrode current collector plate 7a intersect each other. At this time, the positive electrode current collector 1 is preliminarily intersected with the comb-shaped positive electrode current collector plate 7a, and then the positive electrode current collector 1 is joined in a ring shape, and the current collector junction portion is connected to the positive electrode current collector plate 7a. Close to cover. With this structure, in addition to being able to ensure a sufficient contact area between the current collector and the current collector, the positive current collector 7a has a shape with an open gap, so that electrolyte injection is possible. It can be done more easily.

集電板の形状は、図６（ｂ）、図６（ｃ）、図６（ｄ）に示すものでもよく、正極集電体１を正極集電板７ｂ、正極集電板７ｃ、正極集電板７ｄに交差させ、上記と同様に作製することで、同等の効果を得られる。また、図６（ａ）や図６（ｂ）の形状の集電板の場合は、先に集電体接合部を形成してから、正極集電板７ａ、正極集電板７ｂと交差させることも可能である。なお、集電板の櫛歯の形状や孔の形状は、図６に示したものに限定されるものではなく、正極集電体１と交差する形状であれば、同等の効果が得られる。   The shape of the current collector plate may be as shown in FIGS. 6 (b), 6 (c), and 6 (d). The positive electrode current collector 1 is made of the positive electrode current collector plate 7b, the positive electrode current collector plate 7c, and the positive electrode current collector. The same effect can be obtained by crossing the electric plate 7d and producing the same as above. In the case of the current collector plate having the shape of FIG. 6A or FIG. 6B, the current collector joint is first formed and then intersected with the positive current collector plate 7a and the positive current collector plate 7b. It is also possible. Note that the shape of the comb teeth and the hole of the current collector plate are not limited to those shown in FIG. 6, and equivalent effects can be obtained as long as the shape intersects with the positive electrode current collector 1.

本発明の第１の実施の形態に関わる角型電池の縦断面図。The longitudinal cross-sectional view of the square battery in connection with the 1st Embodiment of this invention. 本発明の第２の実施の形態に関わる角型電池の要部の縦断面図。The longitudinal cross-sectional view of the principal part of the square battery in connection with the 2nd Embodiment of this invention. 本発明の第３の実施の形態に関わる角型電池の集電板に設けた狭持部材の形状の一例を示す図で、図３（ａ）は狭持部材と集電体との接続形態を示す説明図で、図３（ｂ）は図３（ａ）を矢印１３の方向から見た説明図。It is a figure which shows an example of the shape of the holding member provided in the current collection board of the square battery in connection with the 3rd Embodiment of this invention, Fig.3 (a) is a connection form of a holding member and a collector. FIG. 3B is an explanatory diagram when FIG. 3A is viewed from the direction of the arrow 13. 本発明の第３の実施の形態に関わる角型電池の集電板に設けた狭持部材の別の形状を示す説明図。Explanatory drawing which shows another shape of the clamping member provided in the current collecting plate of the square battery in connection with the 3rd Embodiment of this invention. 発明の第４の実施の形態に関わる角型電池の要部を示す図で、図５（ａ）は、櫛歯形状集電板と集電体との接続形態を示す説明図で、図５（ｂ）は図５（ａ）の集電体を矢印１４の方向から見た説明図。FIG. 5A is a diagram showing a main part of a prismatic battery according to a fourth embodiment of the invention, and FIG. 5A is an explanatory diagram showing a connection form between a comb-shaped current collector and a current collector. (B) is explanatory drawing which looked at the electrical power collector of Fig.5 (a) from the direction of the arrow 14. FIG. 本発明の第４の実施の形態に関わる角型電池の集電板の形状を示す図で、図６（ａ）は櫛歯状の集電板を示す図、図６（ｂ）は長方形状の孔を設けた集電板を示す図、図６（ｃ）は櫛歯状に対向するように配置された集電板を示す図、図６（ｄ）は角孔が形成された集電板を示す図。It is a figure which shows the shape of the current collecting plate of the square battery in connection with the 4th Embodiment of this invention, Fig.6 (a) is a figure which shows a comb-tooth shaped current collecting plate, FIG.6 (b) is a rectangular shape. FIG. 6 (c) is a diagram showing a current collector plate disposed so as to be opposed in a comb-tooth shape, and FIG. 6 (d) is a current collector with square holes formed therein. The figure which shows a board.

符号の説明Explanation of symbols

１ 正極集電体
２ 正極活物質
３ 正極板
４ 負極集電体
５ 負極活物質
６ 負極板
７、７ａ、７ｂ、７ｃ、７ｄ 正極集電板
８ 負極集電板
９ セパレータ
１０ 絶縁体
１１ 絶縁突起部
１２ 狭持部材
１３、１４ 矢印 DESCRIPTION OF SYMBOLS 1 Positive electrode collector 2 Positive electrode active material 3 Positive electrode plate 4 Negative electrode current collector 5 Negative electrode active material 6 Negative electrode plate 7, 7a, 7b, 7c, 7d Positive electrode current collector plate 8 Negative electrode current collector plate 9 Separator 10 Insulator 11 Insulation protrusion Part 12 Nipping member 13, 14 arrow

Claims (5)

正極集電体の両面に正極活物質を塗布した正極板と、負極集電体の両面に負極活物質を塗布した負極板とがセパレータを介して積層構造を形成した極板群を、電解液と共に電池缶に収納されてなる角型電池であって、
前記極板群の両側面に接するように設けられた絶縁体と、
前記正極集電体の端部と前記負極集電体の端部とが前記両側面から前記絶縁体を通して互いに逆方向に突出し、該突出した端部が同極同士で接合されて輪状に形成された集電体接合部と、
前記集電体接合部にそれぞれ密着して接続された正極集電板および負極集電板であって、外部端子との導通を確保するための正極集電板および負極集電板と、
を有することを特徴とする角型電池。 An electrode plate group in which a positive electrode plate in which a positive electrode active material is applied on both surfaces of a positive electrode current collector and a negative electrode plate in which a negative electrode active material is applied on both surfaces of a negative electrode current collector forms a laminated structure with a separator interposed therebetween. A prismatic battery housed in a battery can,
An insulator provided in contact with both sides of the electrode plate assembly,
Forming the the end of the end portion of the positive electrode current collector and the negative electrode current collector projecting in opposite directions to each other through the insulator from the both sides, annular end issued projecting is joined with same poles and the collector junction is,
A positive electrode current collector plate and the negative electrode current collector plate that is connected in close contact to each of the current collector junction, the positive electrode and negative electrode terminal plates to ensure conduction between the external terminal,
Prismatic battery characterized by having a. 前記極板群両側面に設けた絶縁体に、前記集電板に向けて絶縁突起部を形成し、前記集電体接合部を、前記絶縁突起部を覆うように当接させることで、集電体と集電板との接続を保持することを特徴とする請求項１記載の角型電池。   An insulating protrusion is formed on the insulator provided on both side surfaces of the electrode plate group toward the current collector plate, and the current collector joint is brought into contact with the insulating protrusion so as to cover the current collector. The prismatic battery according to claim 1, wherein a connection between the electric body and the current collector plate is maintained. 前記集電板に前記集電体接合部を挟み込む手段を有する挟持部材を設置し、前記挟持部材に前記集電体接合部を挿入し挟み込んで固定することにより、集電体と集電板との接続を保持することを特徴とする請求項１記載の角型電池。
By a clamping member having means for sandwiching the collector junction the collector plate is placed and fixed by sandwiching inserting the current collector junction to said clamping member, the current collector and the current collector plate The prismatic battery according to claim 1, wherein the connection with the battery is maintained.
前記集電板を櫛歯形状とし、前記集電体接合部と前記集電板とを交差させ、集電体と集電板との接続を保持することを特徴とする請求項１記載の角型電池。   The corner according to claim 1, wherein the current collector plate has a comb-teeth shape, the current collector joint portion and the current collector plate are crossed, and the connection between the current collector and the current collector plate is maintained. Type battery. 前記集電体接合部と前記集電板とを溶接にて接続したことを特徴とする請求項１ないし請求項４のいずれか１項に記載の角型電池。   The prismatic battery according to any one of claims 1 to 4, wherein the current collector joint portion and the current collector plate are connected by welding.
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