JP4168592B2 - Secondary battery and method for manufacturing secondary battery - Google Patents

Secondary battery and method for manufacturing secondary battery Download PDF

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JP4168592B2
JP4168592B2 JP2000388814A JP2000388814A JP4168592B2 JP 4168592 B2 JP4168592 B2 JP 4168592B2 JP 2000388814 A JP2000388814 A JP 2000388814A JP 2000388814 A JP2000388814 A JP 2000388814A JP 4168592 B2 JP4168592 B2 JP 4168592B2
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secondary battery
lead portion
external terminal
electrode
negative electrode
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JP2002190295A (en
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耕 野崎
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/10—Energy storage using batteries

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Description

【０００１】
【発明の属する技術分野】
本発明は、正電極と負電極とからそれぞれ所定の位置に延伸されたリード部が形成された電極体と、該電極体を収納し前記リード部と電気的に接続可能な外部端子が一体形成された密閉容器とを有する二次電池に関する。
【０００２】
【従来の技術】
従来、この種の二次電池としては、正電極と負電極とが積層または巻回して構成された電極体を、正電極および負電極からそれぞれ外部に延伸したリード部（集電部）と共に容器内部に収納し、このリード部と溶接などにより接続すると共に容器外部に露出するように端子を形成したものが提案されている（例えば、特開平９−１４７８３０号公報や特開平１０−２７００４８号公報など）。
【０００３】
【発明が解決しようとする課題】
しかしながら、こうした二次電池では、その性能を十分に発揮できない場合や構造が複雑となる場合がある。従来の二次電池では、端子は容器内部のリード部と容器外部（外部端子となる部分）とを接続するための形状としなければならないから、リード部の延伸位置によっては電池内部の構造が複雑となったり、リード部から外部端子までの接続抵抗が増大して電池性能が低下したりする。また、電池が複雑な構造になれば、二次電池の製造工程が複雑になったり、二次電池そのものが大きくなってしまう場合もある。こうした問題は、二次電池の小型化や高性能化を考えるとき、大きくクローズアップされる。
【０００４】
本発明の二次電池は、電池性能を維持しつつ簡易な構成とすることを目的の一つとする。また、本発明の二次電池の製造方法は、電池性能を維持しつつ簡易な構成の二次電池の製造方法を提供することを目的の一つとする。
【０００５】
【課題を解決するための手段およびその作用・効果】
本発明の二次電池および二次電池の製造方法は、上述の目的の少なくとも一部を達成するために以下の手段を採った。
【０００６】
本発明の二次電池は、
正電極及び負電極のリード部が形成された電極体と、該電極体を収納し前記リード部と電気的に接続可能な外部端子が一体形成された密閉容器とを有する二次電池であって、
前記電極体が前記密閉容器により収納された状態において、前記外部端子は前記リード部を嵌挿して被覆可能な形状であり、前記リード部は、前記外部端子に嵌挿されるように前記正電極、前記負電極の集電部分をそれぞれ集束させたものであって、前記外部端子と直接接続されることを特徴とする。
【０００７】
この本発明の二次電池によれば、電極体のリード部は密閉容器に一体形成された外部端子に嵌挿されるから、電池性能を維持しつつ簡易な構成とすることができる。ここで「外部端子が一体形成された」とは、密閉容器が外部端子と同一素材で完全に一体形成されたものの他、密閉容器の製造過程で外部端子が接着や射出成形などにより組み付けられて一体形成されたものも含まれる。
【０００８】
こうした本発明の二次電池において、前記密閉容器は、電気伝導性を有する部材により形成され、前記リード部を被覆可能な前記外部端子が各々形成された２つの部材からなり、前記２つの部材は、前記電極体を収納した状態で電気絶縁性の部材を介してかしめにより接合されたものとすることもできる。
【０００９】
前記外部端子は、前記リード部に圧着により接続されたものとすることもできる。こうすれば、外部端子にリード部を接続する際に電極体に与える影響をより少なくすることができる。
【００１０】
本発明の二次電池の製造方法は、
正電極及び負電極のリード部を有する電極体を形成する電極体形成工程と、
互いに接合することにより前記電極体を密閉可能な形状であって、前記リード部に嵌挿する位置に該リード部と電気的に接続するための外部端子を各々有する２つの密閉部材を電気伝導性の部材により形成する密閉部材形成工程と、
前記外部端子に嵌挿されるように前記正電極、前記負電極の集電部分をそれぞれ集束させたものであって、前記外部端子と直接接続される前記リード部を形成するリード部形成工程と、
該形成された２つの密閉部材に前記電極体を収納する収納工程と、
前記外部端子を前記リード部に接合すると共に前記２つの密閉部材を電気絶縁性の部材を介して接合する接合工程と
を備えることを要旨とする。
【００１１】
この本発明の二次電池の製造方法によれば、電極体のリード部は密閉容器に一体形成された外部端子に嵌挿されるから、性能を維持しつつ簡易な構成の二次電池を製造することができる。
【００１２】
【発明の実施の形態】
次に、本発明の実施の形態を実施例を用いて説明する。図１は本発明の一実施例である二次電池２０の構成の概略を示す構成図であり、図２は実施例の二次電池２０の図１中のＡ−Ａ断面を示す断面図である。実施例の二次電池２０は、例えば、リチウムイオン電池やニッケル水素電池として構成されており、図示するように、正電極３１及び負電極３２の集電部分としての正極側リード部３４と負極側リード部３６とを有する電極体３０と、電極体３０を収納すると共に収納時に負極側リード部３６と電気的に接続する負極側端子部２６が形成された電池ケース２８と、電池ケース２８の蓋をなし電池ケース２８に組み付けたときに正極側リード部３４と電気的に接続する正極側端子部２２が形成されたケース蓋２４とを備える。電池ケース２８に形成された負極側端子部２６およびケース蓋２４に形成された正極側端子部２２は、電気機器などと電力のやり取りを行なうための外部端子として機能する。
【００１３】
電極体３０は、正電極３１と負電極３２とがセパレータ３３を介して当接し、これが巻回して形成されている。正電極３１の集電部分としての正極側リード部３４は、電極の基体となる帯状の金属板への正極活物質の未塗布部分（図２の上部）を用いて形成されている。一方、負電極３２の集電部分としての負極側リード部３６は、正電極３１の正極側リード部３４と反対の方向（図２の下部）に設けられた金属板への負極活物質の未塗布部分を用いて形成されている。勿論、本実施例では、活物質の未塗布部分を正極側リード部３４、負極側リード部３６として形成するものとしたが、別個に導電性の材料を正電極３１と負電極３２とに接合させて、これをリード部として形成するものとしてもよい。
【００１４】
電池ケース２８は、導電性の優れた材料（例えば、ニッケルめっき鉄材、アルミニウム、ステンレスなど）により形成されている。電池ケース２８の図２下部には、負極側リード部３６を嵌挿して被覆可能な負極側端子部２６が形成されている。負極側端子部２６は、負極側リード部３６を嵌挿した状態で圧着により電気的に接続されている。
【００１５】
ケース蓋２４も電池ケース２８と同様に導電性の優れた材料により形成されており、電池ケース２８に組み付けて接合した状態で電極体３０を被覆密閉できるようになっている。ケース蓋２４には、その中央部に正極側リード部３４を嵌挿して被覆可能な正極側端子部２２が形成されている。正極側端子部２２は、正極側リード部３４を嵌挿した状態で圧着により電気的に接続されている。ケース蓋２４と電池ケース２８とは、絶縁性材料（例えば、樹脂など）を介して接合部４２で接合されており、正極側端子部２２と負極側端子部２６との電気的絶縁性を確保している。
【００１６】
こうして構成された二次電池２０の製造の工程について説明する。図３は実施例の二次電池２０の製造の様子を説明する説明図である。二次電池２０として正極端子と負極端子とが互いに反対の面に形成された渦巻き状の二次電池を製造する場合を考える。二次電池２０は、図示するように、まず、同一形状の２つの帯状の金属板に対して長手方向の一側端部分に未塗布部分（集電部分）が形成されるようにそれぞれ正極活物質、負極活物質を同一の形状（矩形状）に塗布して正電極３１と負電極３２を形成し、それぞれの未塗布部分（集電部分）が互いに対峙する方向に突出するよう正電極３１と負電極３２とをセパレータ３３を介して当接させ、これを巻回して電極体３０を形成する（図３（ａ））。次に、電極体３０の集電部分（活物質の未塗布部分）をプレスすると共に不要部分を切欠して正極側リード部３４および負極側リード部３６を形成する（図３（ｂ），（ｃ））。これにより、正極側リード部３４および負極側リード部３６は、二次電池２０の外部端子と直接接続される位置に嵌挿されることになる。次に、電極体３０を被覆密閉する容器として電池ケース２８とケース蓋２４とを鉄やニッケルなどの導電性の優れた材料により形成する。このとき、電池ケース２８には負極側リード部３６と嵌合する負極側端子部２６を、ケース蓋２４には正極側リード部３４と嵌合する正極側端子部２２を、それぞれインパクト成形や深絞り成形などにより形成する。そして、ケース蓋２４を正極側端子部２２と正極側リード部３４とが嵌挿する位置で取り付けて、正極側端子部２２と正極側リード部３４とを圧着により電気的に接続する（図３（ｄ））。続いて、電池ケース２８を負極側端子部２６と負極側リード部３６とが嵌挿する位置で取り付けて、負極側端子部２６と負極側リード部３６とを圧着により電気的に接続すると共に電池ケース２８とケース蓋２４とを絶縁性材料（例えば、樹脂）を介してかしめにより接合して（図３（ｅ））二次電池２０が完成する。
【００１７】
以上説明した本発明の二次電池２０によれば、電極体３０の正極側リード部３４および負極側リード部３６を、電極体３０の容器である電池ケース２８およびケース蓋２４に一体形成された外部端子としての正極側端子部２２および負極側端子部２６にそれぞれ嵌挿することにより、部品点数を減らすことができ、性能を維持しつつ簡易な構成の二次電池とすることができる。この結果、二次電池の軽量化や小型化を図ることができる。しかも、正極側端子部２２と正極側リード部３４との接続および負極側端子部２６と負極側リード部３６との接続を圧着により行なうから、両者の接続時の発熱を抑えることができ、発熱によって電極体３０に与える影響をより少なくすることができる。
【００１８】
実施例の二次電池２０では、正極側端子部２２と正極側リード部３４との電気的接続および負極側端子部２６と負極側リード部３６との電気的接続を圧着により行なうものとしたが、発熱の比較的少ないレーザ溶接などを適宜併用するものとしてもよい。また、二次電池２０の性能に影響を与えない範囲内で他の接続方法（例えば、ボルトの組み付けによる接続など）を用いても構わない。
【００１９】
また、実施例の二次電池２０では、ケース蓋２４と電池ケース２８とを絶縁性部材を介してかしめにより接合するものとしたが、ケース蓋２４と電池ケース２８とを絶縁性部材を介して接着するものとしてもよい。
【００２０】
さらに、実施例の二次電池２０では、電池容器としてのケース蓋２４と電池ケース２８とを電気伝導性の優れた材料により形成して両者を絶縁性材料を介して接合するものとしたが、正極側端子部２２および負極側端子部２６が電気伝導性に優れた材料により形成されると共に両者の絶縁性を確保できれば、容器の他の部分は、樹脂などの絶縁性材料により形成するものとしてもよい。この場合のケース蓋２４や電池ケース２８は、例えば、射出によりケース蓋２４や電池ケース２８を形成する型に、予め電気伝導性に優れた材料により形成された正極側端子部２２、負極側端子部２６を所定の部位に固定し、この状態で型に樹脂を流すことにより製造することができる。あるいは、正極側端子部２２や負極側端子部２６を接着してケース蓋２４や電池ケース２８を形成するものとしてもよい。
【００２１】
また、実施例の二次電池２０では、正電極３１と負電極３２とが巻回されたものとして構成したが、正電極と負電極とを互いに積層したものとして構成するものとしてもよい。図４は、正電極と負電極とが互いに積層した電極体１３０を有する二次電池１２０の構成の概略を示す分解図である。図４において、電極体１３０は、正電極の集電部分としての正極側リード部１３４と、正極側リード部１３４が形成された面と同一面の異なる部位に負電極の集電部分としての負極側リード部１３６とを備える。電極体１３０を収納する箱状の電池ケース１２８は、樹脂により形成されている。電池ケース１２８の蓋を形成する樹脂製のケース蓋１２４は、電極体１３０を収納した電池ケース１２８に組み付けたときに正極側リード部１３４と負極側リード部１３６とに嵌挿する位置にそれぞれ電気伝導性に優れた材料により形成された正極側端子部１２２と負極側端子部１２６とが嵌合可能に形成されている。この正極側リード部１３４と負極側リード部１３６とは、前述の方法でケース蓋１２４に形成することができる。なお、ケース蓋１２４と電池ケース１２８とは、例えば、熱溶着などにより接合されて電極体１３０を密閉収納する。
【００２２】
また、実施例の二次電池２０では、電池ケース２８とケース蓋２４との２つの部材により電極体３０を収納する密閉容器を形成するものとしたが、１つあるいは３つ以上の部材により密閉容器を形成するものとしてもよい。
【００２３】
また、実施例の電池２０では、ケース蓋２４に正極側端子部２２を形成し、電池ケース２８に負極側端子部２６を形成するものとしたが、ケース蓋に負極側端子部を形成し、電池ケースに正極側端子部を形成するものとしても構わない。また、絶縁性が確保されれば、電池ケースまたはケース蓋の一方に正電極側端子部と負電極側端子部とを形成するものとしてもよい。
【００２４】
以上、本発明の実施の形態について実施例を用いて説明したが、本発明のこうした実施例に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲内において、種々なる形態で実施し得ることは勿論である。
【図面の簡単な説明】
【図１】 本発明の一実施例である二次電池２０の構成の概略を示す構成図である。
【図２】 実施例の二次電池２０の図１中のＡ−Ａ断面を示す断面図である。
【図３】 実施例の二次電池２０の製造の様子を説明する説明図である。
【図４】 正電極と負電極とが互いに積層した電極体１３０を有する二次電池１２０の構成の概略を示す分解図である。
【符号の説明】
２０，１２０ 二次電池、２２，１２２ 正極側端子部、２６，１２６ 負極側端子部、２４，１２４ ケース蓋、２８，１２８ 電池ケース、３０，１３０電極体、３１ 正電極、３２ 負電極、３３ セパレータ、３４，１３４ 正極側リード部、３６，１３６ 負極側リード部、４２ 接合部。[0001]
BACKGROUND OF THE INVENTION
According to the present invention, an electrode body in which lead portions extending from a positive electrode and a negative electrode to predetermined positions are formed, and an external terminal that accommodates the electrode body and can be electrically connected to the lead portion are integrally formed. The present invention relates to a secondary battery having a sealed container.
[0002]
[Prior art]
Conventionally, as this type of secondary battery, an electrode body formed by laminating or winding a positive electrode and a negative electrode is used together with a lead portion (current collector portion) extending outward from the positive electrode and the negative electrode, respectively. There have been proposed ones in which terminals are formed so as to be housed inside and connected to the lead portions by welding or the like and exposed to the outside of the container (for example, Japanese Patent Laid-Open Nos. 9-147830 and 10-270048). Such).
[0003]
[Problems to be solved by the invention]
However, in such a secondary battery, the performance may not be sufficiently exhibited or the structure may be complicated. In conventional secondary batteries, the terminal must be shaped to connect the lead inside the container and the outside of the container (the part that becomes the external terminal), so the internal structure of the battery is complex depending on the extension position of the lead. Or the connection resistance from the lead part to the external terminal increases, and the battery performance decreases. Further, if the battery has a complicated structure, the manufacturing process of the secondary battery may become complicated, or the secondary battery itself may become large. Such problems are greatly highlighted when considering the reduction in size and performance of secondary batteries.
[0004]
One object of the secondary battery of the present invention is to have a simple configuration while maintaining battery performance. Another object of the method for manufacturing a secondary battery of the present invention is to provide a method for manufacturing a secondary battery having a simple configuration while maintaining battery performance.
[0005]
[Means for solving the problems and their functions and effects]
The secondary battery and the method for manufacturing the secondary battery of the present invention employ the following means in order to achieve at least a part of the above object.
[0006]
The secondary battery of the present invention is
A secondary battery comprising: an electrode body in which a lead portion of a positive electrode and a negative electrode is formed; and a sealed container in which an external terminal that houses the electrode body and can be electrically connected to the lead portion is integrally formed. ,
In a state in which pre-Symbol electrode body is accommodated by the closed container, the external terminal is a coatable shape fitted to the lead portion, the lead portion, the positive electrode as fit inserted into the external terminal the a collector portion of the negative electrode which was the focused respectively, characterized Rukoto connected the direct and the external terminal.
[0007]
According to the secondary battery of the present invention, since the lead portion of the electrode body Ru fitted to the external terminals which are integrally formed on the closed container can be a simple structure while maintaining cell performance. Here, “the external terminal is integrally formed” means that the closed container is completely formed of the same material as the external terminal, and that the external terminal is assembled by adhesion or injection molding in the manufacturing process of the closed container. The one formed integrally is also included.
[0008]
In such a secondary battery of the present invention, the sealed container is formed of two members each formed of an electrically conductive member, and each of the external terminals that can cover the lead portion is formed. Further, it can be joined by caulking through an electrically insulating member in a state where the electrode body is housed.
[0009]
The external terminal may be connected to the lead portion by pressure bonding. In this way, the influence on the electrode body can be reduced when the lead portion is connected to the external terminal.
[0010]
The method for producing the secondary battery of the present invention includes:
And an electrode forming step of forming an electrode body having a lead portion of the positive and negative electrodes,
A shape that can seal the electrode assembly by joining together, an electrically conductive two sealing members, each having an external terminal for said leading portion and electrically connected to the position fitted to the lead portion A sealing member forming step formed by the members of
A lead part forming step of focusing the current collecting portions of the positive electrode and the negative electrode so as to be fitted into the external terminal, and forming the lead part directly connected to the external terminal;
A housing step of housing the electrode body in the two formed sealing members;
And a bonding step of bonding the external terminal to the lead portion and bonding the two sealing members via an electrically insulating member.
[0011]
According to the manufacturing method of the secondary battery of the present invention, producing a secondary battery having a simple configuration because the lead portion of the electrode body Ru fitted to an external terminal which is integrally formed in a sealed container, while maintaining the performance can do.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described using examples. FIG. 1 is a block diagram showing an outline of the configuration of a secondary battery 20 according to an embodiment of the present invention, and FIG. is there. Example of the secondary battery 20 is, for example, is configured as a lithium ion battery or a nickel hydrogen battery, as shown, the positive electrode side lead 34 and the negative electrode side of the current collecting portion of the positive electrode 31 and negative electrode 32 An electrode body 30 having a lead portion 36; a battery case 28 in which the electrode body 30 is housed and the negative electrode side terminal portion 26 electrically connected to the negative electrode side lead portion 36 is formed; and a lid of the battery case 28 And a case lid 24 formed with a positive terminal portion 22 that is electrically connected to the positive lead portion 34 when assembled to the battery case 28. The negative electrode side terminal portion 26 formed on the battery case 28 and the positive electrode side terminal portion 22 formed on the case lid 24 function as external terminals for exchanging electric power with electric devices and the like.
[0013]
The electrode body 30 is formed by a positive electrode 31 and a negative electrode 32 coming into contact with each other through a separator 33 and wound. The positive electrode side lead portion 34 of the current collecting part component of the positive electrode 31 is formed by using the uncoated portion of the positive electrode active material into a strip-shaped metal plate with a base electrode (upper part of FIG. 2). On the other hand, the negative electrode side lead section 36 of the current collecting part component of the negative electrode 32, opposite to the positive electrode side lead portion 34 of the positive electrode 31 direction of the negative electrode active material to the metal plate provided on the (lower part of FIG. 2) It is formed using an uncoated part. Of course, in this embodiment, the uncoated portions of the active material are formed as the positive electrode side lead portion 34 and the negative electrode side lead portion 36, but a conductive material is separately bonded to the positive electrode 31 and the negative electrode 32. Then, this may be formed as a lead portion.
[0014]
The battery case 28 is formed of a material having excellent conductivity (for example, nickel-plated iron material, aluminum, stainless steel, etc.). In the lower part of the battery case 28 in FIG. 2, a negative electrode side terminal portion 26 that can be covered with a negative electrode side lead portion 36 is formed. The negative electrode side terminal portion 26 is electrically connected by crimping in a state where the negative electrode side lead portion 36 is inserted.
[0015]
Similarly to the battery case 28, the case lid 24 is formed of a material having excellent conductivity, and the electrode body 30 can be covered and sealed in a state of being assembled and joined to the battery case 28. The case lid 24 is formed with a positive terminal portion 22 that can be covered by inserting a positive lead portion 34 at the center thereof. The positive terminal portion 22 is electrically connected by crimping with the positive lead portion 34 inserted. The case lid 24 and the battery case 28 are joined by a joining portion 42 via an insulating material (for example, resin), and electrical insulation between the positive terminal portion 22 and the negative terminal portion 26 is ensured. is doing.
[0016]
A process for manufacturing the secondary battery 20 configured as described above will be described. FIG. 3 is an explanatory diagram for explaining the production of the secondary battery 20 of the embodiment. Consider a case where a spiral secondary battery in which a positive electrode terminal and a negative electrode terminal are formed on opposite surfaces as the secondary battery 20 is manufactured. As shown in the figure, the secondary battery 20 first has a positive electrode active portion so that an uncoated portion (current collecting portion) is formed at one end portion in the longitudinal direction with respect to two strip-shaped metal plates having the same shape. The positive electrode 31 and the negative electrode 32 are formed by applying the material and the negative electrode active material in the same shape (rectangular shape), and the non-coated portions (current collecting portions) protrude in directions facing each other. And the negative electrode 32 are brought into contact with each other through the separator 33 and wound to form the electrode body 30 (FIG. 3A). Next, the current collecting part (uncoated part of the active material) of the electrode body 30 is pressed and the unnecessary part is cut away to form the positive electrode side lead part 34 and the negative electrode side lead part 36 (FIG. 3B, ( c)). Thus, the positive-side leads 34 and the negative electrode side lead section 36 will be fitted in a position that is directly connected to the external terminal of the secondary battery 20. Next, the battery case 28 and the case lid 24 are formed of a material having excellent conductivity such as iron or nickel as a container for covering and sealing the electrode body 30. At this time, the battery case 28 has the negative electrode side terminal portion 26 fitted to the negative electrode side lead portion 36, and the case lid 24 has the positive electrode side terminal portion 22 fitted to the positive electrode side lead portion 34, respectively. It is formed by drawing or the like. Then, the case cover 24 and the positive terminal 22 and the positive-side lead 34 is attached at a position fitted, electrically connected by crimping the positive terminal 22 and the positive-side lead section 34 (FIG. 3 (D)). Battery with Subsequently, mounted at a position where the battery case 28 and the negative terminal 26 and the negative electrode side lead portion 36 is fitted, are electrically connected by crimping the negative electrode terminal part 26 and the negative electrode side lead section 36 The case 28 and the case lid 24 are joined by caulking through an insulating material (for example, resin) (FIG. 3E), and the secondary battery 20 is completed.
[0017]
According to the secondary battery 20 of the present invention described above, the positive electrode side lead portion 34 and the negative electrode side lead portion 36 of the electrode body 30 are integrally formed on the battery case 28 and the case lid 24 that are containers of the electrode body 30. by fitted respectively to the positive terminal 22 and the negative electrode terminal part 26 as an external terminal, it is possible to reduce the number of parts can be a secondary battery having the simple configuration while maintaining performance. As a result, the secondary battery can be reduced in weight and size. Moreover, since the connection between the positive electrode side terminal portion 22 and the positive electrode side lead portion 34 and the connection between the negative electrode side terminal portion 26 and the negative electrode side lead portion 36 are performed by pressure bonding, heat generation at the time of connection between the two can be suppressed, Thus, the influence on the electrode body 30 can be further reduced.
[0018]
In the secondary battery 20 of the example, the positive electrode side terminal portion 22 and the positive electrode side lead portion 34 are electrically connected and the negative electrode side terminal portion 26 and the negative electrode side lead portion 36 are electrically connected by pressure bonding. Further, laser welding with relatively little heat generation may be used in combination as appropriate. Moreover, you may use another connection method (For example, the connection by the assembly | attachment of a volt | bolt etc.) within the range which does not affect the performance of the secondary battery 20. FIG.
[0019]
In the secondary battery 20 of the embodiment, the case lid 24 and the battery case 28 are joined by caulking through an insulating member, but the case lid 24 and the battery case 28 are joined via an insulating member. It is good also as what adheres.
[0020]
Furthermore, in the secondary battery 20 of the example, the case lid 24 and the battery case 28 as a battery container are formed of a material having excellent electrical conductivity, and both are bonded via an insulating material. If the positive electrode side terminal portion 22 and the negative electrode side terminal portion 26 are formed of a material having excellent electrical conductivity and the insulation of both can be secured, the other part of the container is formed of an insulating material such as a resin. Also good. In this case, the case lid 24 and the battery case 28 are, for example, a positive electrode side terminal portion 22 and a negative electrode side terminal that are previously formed of a material having excellent electrical conductivity in a mold that forms the case lid 24 and the battery case 28 by injection. It can be manufactured by fixing the part 26 to a predetermined part and pouring the resin into the mold in this state. Alternatively, the case lid 24 and the battery case 28 may be formed by bonding the positive electrode side terminal portion 22 and the negative electrode side terminal portion 26.
[0021]
In the secondary battery 20 of the embodiment, the positive electrode 31 and the negative electrode 32 are wound. However, the positive battery 31 and the negative electrode 32 may be stacked. FIG. 4 is an exploded view showing a schematic configuration of a secondary battery 120 having an electrode body 130 in which a positive electrode and a negative electrode are stacked on each other. 4, the electrode body 130 includes a positive-side lead section 134 as a current collector unit amount of the positive electrode, as a current collector unit amount of the negative electrode at different sites flush with the surface of the positive-side lead section 134 is formed and a negative-side lead section 136 of. A box-shaped battery case 128 that houses the electrode body 130 is formed of resin. Resin case lid 124 to form the lid of the battery case 128, at positions electrically to fitted to the positive electrode side lead 134 and the negative electrode side lead portion 136 when assembled in a battery case 128 accommodating the electrode body 130 The positive electrode side terminal portion 122 and the negative electrode side terminal portion 126 formed of a material having excellent conductivity are formed so as to be fitted. The positive lead portion 134 and the negative lead portion 136 can be formed on the case lid 124 by the method described above. Note that the case lid 124 and the battery case 128 are bonded together by, for example, heat welding, and the electrode body 130 is hermetically stored.
[0022]
In the secondary battery 20 of the embodiment, the sealed container for housing the electrode body 30 is formed by the two members of the battery case 28 and the case lid 24. However, the sealed battery is sealed by one or more members. It is good also as what forms a container.
[0023]
Further, in the battery 20 of the example, the positive electrode side terminal portion 22 is formed on the case lid 24 and the negative electrode side terminal portion 26 is formed on the battery case 28. However, the negative electrode side terminal portion is formed on the case lid, The positive electrode side terminal portion may be formed on the battery case. Moreover, as long as insulation is ensured, it is good also as what forms a positive electrode side terminal part and a negative electrode side terminal part in one of a battery case or a case cover.
[0024]
The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments and can be implemented in various forms without departing from the gist of the present invention. Of course you get.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an outline of a configuration of a secondary battery 20 according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the AA cross section in FIG. 1 of the secondary battery 20 of the example.
FIG. 3 is an explanatory diagram illustrating a state of manufacturing the secondary battery 20 of the example.
FIG. 4 is an exploded view showing an outline of the configuration of a secondary battery 120 having an electrode body 130 in which a positive electrode and a negative electrode are stacked on each other.
[Explanation of symbols]
20, 120 Secondary battery, 22, 122 Positive terminal, 26, 126 Negative terminal, 24, 124 Case lid, 28, 128 Battery case, 30, 130 electrode body, 31 Positive electrode, 32 Negative electrode, 33 Separator, 34, 134 Positive side lead part, 36, 136 Negative side lead part, 42 Joining part.

Claims (4)

正電極及び負電極のリード部が形成された電極体と、該電極体を収納し前記リード部と電気的に接続可能な外部端子が一体形成された密閉容器とを有する二次電池であって、
前記電極体が前記密閉容器により収納された状態において、前記外部端子は前記リード部を嵌挿して被覆可能な形状であり、前記リード部は、前記外部端子に嵌挿されるように前記正電極、前記負電極の集電部分をそれぞれ集束させたものであって、前記外部端子と直接接続されることを特徴とする二次電池。A secondary battery comprising: an electrode body in which a lead portion of a positive electrode and a negative electrode is formed; and a sealed container in which an external terminal that houses the electrode body and can be electrically connected to the lead portion is integrally formed. ,
In a state in which pre-Symbol electrode body is accommodated by the closed container, the external terminal is a coatable shape fitted to the lead portion, the lead portion, the positive electrode as fit inserted into the external terminal the negative electrode of the current collecting part be one that is focused respectively, secondary batteries, characterized Rukoto connected the direct and the external terminal. 請求項１記載の二次電池であって、
前記密閉容器は、電気伝導性を有する部材により形成され、前記リード部を被覆可能な前記外部端子が各々形成された２つの部材からなり、
前記２つの部材は、前記電極体を収納した状態で電気絶縁性の部材を介してかしめにより接合されたことを特徴とする二次電池。The secondary battery according to claim 1,
The sealed container is formed of two members each formed of a member having electrical conductivity, and each of the external terminals capable of covering the lead portion is formed.
The secondary battery, wherein the two members are joined by caulking through an electrically insulating member in a state where the electrode body is accommodated. 請求項１または２記載の二次電池であって、
前記外部端子は、前記リード部に圧着により接続されたことを特徴とする二次電池。The secondary battery according to claim 1 or 2,
The secondary battery, wherein the external terminal is connected to the lead portion by pressure bonding. 正電極及び負電極のリード部を有する電極体を形成する電極体形成工程と、
互いに接合することにより前記電極体を密閉可能な形状であって、前記リード部に嵌挿する位置に該リード部と電気的に接続するための外部端子を各々有する２つの密閉部材を電気伝導性の部材により形成する密閉部材形成工程と、
前記外部端子に嵌挿されるように前記正電極、前記負電極の集電部分をそれぞれ集束させたものであって、前記外部端子と直接接続される前記リード部を形成するリード部形成工程と、
該形成された２つの密閉部材に前記電極体を収納する収納工程と、
前記外部端子を前記リード部に接合すると共に前記２つの密閉部材を電気絶縁性の部材を介して接合する接合工程と
を備えることを特徴とする二次電池の製造方法。An electrode forming step of forming an electrode body having a lead portion of the positive and negative electrodes,
A shape that can seal the electrode assembly by joining together, an electrically conductive two sealing members, each having an external terminal for said leading portion and electrically connected to the position fitted to the lead portion A sealing member forming step formed by the members of
A lead part forming step of focusing the current collecting portions of the positive electrode and the negative electrode so as to be fitted into the external terminal, and forming the lead part directly connected to the external terminal;
A housing step of housing the electrode body in the two formed sealing members;
And a joining step of joining the external terminal to the lead portion and joining the two sealing members via an electrically insulating member.
JP2000388814A 2000-12-21 2000-12-21 Secondary battery and method for manufacturing secondary battery Expired - Fee Related JP4168592B2 (en)

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