JP2000243374A - Polymer electrolyte battery - Google Patents
Polymer electrolyte batteryInfo
- Publication number
- JP2000243374A JP2000243374A JP11036932A JP3693299A JP2000243374A JP 2000243374 A JP2000243374 A JP 2000243374A JP 11036932 A JP11036932 A JP 11036932A JP 3693299 A JP3693299 A JP 3693299A JP 2000243374 A JP2000243374 A JP 2000243374A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- polymer electrolyte
- negative electrode
- welding
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
Landscapes
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ポリマー電解質電
池に関し、さらに詳しくは、特に携帯用電子機器、電気
自動車、ロードレベリングなどの電源として使用するの
に適したポリマー電解質電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer electrolyte battery, and more particularly, to a polymer electrolyte battery particularly suitable for use as a power source for portable electronic devices, electric vehicles, road leveling, and the like.
【０００２】[0002]
【従来の技術】ポリマー電解質電池では、電解質をシー
ト状にすることができ、それによって、Ａ４版、Ｂ５版
などの大面積でしかも薄形の電池の作製が可能になり、
各種薄形製品への適用が可能になって、電池の使用範囲
が大きく広がっている。このポリマー電解質を用いた電
池は、耐漏液性を含めた安全性、貯蔵性が優れており、
しかも薄く、フレキシブルなので、電池使用機器の形状
に合わせた電池を設計できるという、今までにない特徴
を持っている。2. Description of the Related Art In a polymer electrolyte battery, the electrolyte can be made into a sheet shape, thereby making it possible to produce a large-area and thin battery such as an A4 size plate or a B5 size plate.
Application to various thin products has become possible, and the range of use of batteries has been greatly expanded. Batteries using this polymer electrolyte have excellent safety and storage properties including leakage resistance,
In addition, because it is thin and flexible, it has an unprecedented feature that allows the design of batteries that match the shape of battery-powered equipment.
【０００３】このポリマー電解質電池は、通常、アルミ
ニウムフィルムを芯材にし、内面側に接着層となる樹脂
フィルムを配置したラミネートフィルムを外装体に用
い、薄いシート状の電極とシート状のポリマー電解質層
とを積層したユニットセルを上記外装体で外装して密閉
することによって、薄形電池に仕上げられる。[0003] This polymer electrolyte battery usually uses a laminate film in which an aluminum film is used as a core material and a resin film serving as an adhesive layer is provided on the inner surface side for an outer package, and a thin sheet-like electrode and a sheet-like polymer electrolyte layer are used. The unit cell obtained by laminating the above is packaged with the above package and sealed to obtain a thin battery.
【０００４】また、電池使用機器によっては、高容量や
高電圧を必要とするものがあり、そのような電池使用機
器に対しては、上記正極、負極およびポリマー電解質層
からなるユニットセルを複数個積層して積層電極群を作
製し、その複数枚の正極、複数枚の負極をそれぞれ並列
に接続して高容量にしたり、あるいは直列に接続して高
電圧にすることによって、対応することが行なわれてい
る。[0004] Some battery-powered devices require high capacity and high voltage. For such battery-powered devices, a plurality of unit cells comprising the above-described positive electrode, negative electrode, and polymer electrolyte layer are required. The stacked electrode group is formed by stacking, and a plurality of positive electrodes and a plurality of negative electrodes are connected in parallel to each other to increase the capacity, or connected in series to increase the voltage, thereby correspondingly. Have been.
【０００５】[0005]
【発明が解決しようとする課題】このポリマー電解質電
池では、上記のようなユニットセルを１個だけ有するシ
ート形電池の場合も、上記ユニットセルを複数個積層し
た積層形電池の場合も、個々の電極を薄形にするため、
通常、金属箔を集電体に用いていて、正極の集電体には
アルミニウム箔を用い、負極の集電体には銅箔を用いて
いる。そして、電池の外部端子、つまり、電池使用機器
との接続に用いる正極端子や負極端子としては、電池使
用機器との接続の容易さなどから、通常、ニッケルの箔
またはリボンが用いられる。In the polymer electrolyte battery, both in the case of a sheet type battery having only one unit cell as described above and in the case of a stacked type battery in which a plurality of the unit cells are stacked, To make the electrode thinner,
Usually, a metal foil is used for the current collector, an aluminum foil is used for the positive electrode current collector, and a copper foil is used for the negative electrode current collector. As an external terminal of the battery, that is, a positive electrode terminal or a negative electrode terminal used for connection with a battery-using device, a nickel foil or ribbon is usually used because of easy connection with the battery-using device.
【０００６】これら電極と外部端子との電気的接続は、
シート形ポリマー電解質電池の場合、通常、正極作製時
にアルミニウム箔の一部に正極合剤層を形成せずにアル
ミニウム箔の露出部を残し、そこをリード部として外部
端子としての正極端子との接続部分にし、負極側では負
極作製時に銅箔の一部に負極合剤層を形成せずに銅箔の
露出部を残し、そこをリード部として外部端子としての
負極端子との接続部分にしている。The electrical connection between these electrodes and external terminals is as follows:
In the case of a sheet-type polymer electrolyte battery, the exposed portion of the aluminum foil is usually left without forming a positive electrode mixture layer on a part of the aluminum foil at the time of manufacturing the positive electrode, and this is used as a lead portion for connection with the positive terminal as an external terminal. In the negative electrode side, the negative electrode mixture layer is not formed on a part of the copper foil at the time of negative electrode production, leaving an exposed portion of the copper foil, and this is used as a lead portion as a connection portion with a negative electrode terminal as an external terminal. .
【０００７】また、上記の積層形ポリマー電解質電池で
は、並列に接続する場合も、また、直列に接続する場合
も、電極のリード部間やそれらと外部端子との間を接続
する必要があり、その手段として電気溶接が採られてい
る。[0007] In the above-mentioned laminated polymer electrolyte battery, it is necessary to connect between the lead portions of the electrodes and between them and the external terminals both in the case of connecting in parallel and in the case of connecting in series. Electric welding is employed as a means for this.
【０００８】この電気溶接は溶接箇所に大電流を流し、
その際の接触抵抗によって発生するジュール熱によっ
て、金属を溶融し、相互を溶接するものである。[0008] In this electric welding, a large electric current is applied to a welding portion,
The Joule heat generated by the contact resistance at that time melts the metals and welds them together.
【０００９】また、接続の信頼性を高めるためには、溶
接箇所は１箇所だけでなく、複数箇所で溶接するのが好
ましい。In order to improve the reliability of the connection, it is preferable to weld not only at one place but also at a plurality of places.
【００１０】しかしながら、同一平面上で複数箇所の電
気溶接を行なう場合、最初の溶接の結果、低抵抗部が出
現するため、次いで電気溶接する箇所の接触状態が、最
初の電気溶接した箇所の接続状態と同じであっても、そ
の箇所に流れる電流が低下して金属溶融量が減少するた
め、溶接強度が低下する。However, when electric welding is performed at a plurality of locations on the same plane, a low-resistance portion appears as a result of the first welding. Even if it is the same as the state, the current flowing in that location decreases and the amount of metal fusion decreases, so that the welding strength decreases.
【００１１】従って、本発明は、上記のような従来技術
の問題点を解決し、リード部の接続強度（溶接強度）を
高め、電池性能の信頼性の高いポリマー電解質電池を提
供することを目的とする。Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, to increase the connection strength (welding strength) of the lead portion, and to provide a polymer electrolyte battery having high battery performance. And
【００１２】[0012]
【課題を解決するための手段】本発明は、正極、負極お
よびポリマー電解質層を有し、上記正極または負極のう
ち少なくとも一方の電極のリード部を複数箇所電気溶接
することによって接続するポリマー電解質電池におい
て、上記リード部の溶接箇所間に開孔部を設けることに
よって、上記課題を解決したものである。SUMMARY OF THE INVENTION The present invention provides a polymer electrolyte battery having a positive electrode, a negative electrode, and a polymer electrolyte layer, wherein the leads of at least one of the positive electrode and the negative electrode are connected by electric welding at a plurality of locations. In the above, the above-mentioned problem has been solved by providing an opening between the welding portions of the lead portion.
【００１３】すなわち、上記のように、リード部の溶接
箇所間に開孔部を設けておくと、２箇所目以後の電気溶
接を行なう場合に、それより先に行なわれた電気溶接に
基づく低抵抗部の影響を低減でき、接続強度（溶接強
度）を高め、電池性能の信頼性の高いポリマー電解質電
池を得ることができる。That is, as described above, if the opening is provided between the welding portions of the lead portion, when performing the electric welding at the second and subsequent locations, the low level based on the electric welding performed earlier is performed. The effect of the resistance portion can be reduced, the connection strength (welding strength) can be increased, and a polymer electrolyte battery with high reliability in battery performance can be obtained.
【００１４】[0014]
【発明の実施の形態】本発明において、リード部に設け
る開孔部は、電気溶接する箇所がｎ個ある場合、通常、
（ｎ−１）個設ければよい。ただし、必ずしも、それに
拘束されることはない。そして、この開孔部は、正極の
リード部および負極のリード部の両方に設けることが好
ましく、また、上記開孔部は、正極、負極とも複数枚用
い、それらの複数枚の正極と複数枚の負極とをそれらの
それぞれの間にポリマー電解質層が介在するようにして
積層した積層電極群を有する積層形ポリマー電解質電池
の電極のリード部に設けておくと、それらの正極間およ
び負極間を並列に接続する場合に、より好適に効果が発
現する。ただし、１枚の正極と１枚の負極とを１枚のポ
リマー電解質層を介在させて積層したユニットセルを１
個だけ用いるシート形ポリマー電解質電池の電極のリー
ド部に上記開孔部を設けてももちろんよい。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, an opening portion provided in a lead portion is usually provided when there are n places to be electrically welded.
What is necessary is just to provide (n-1) pieces. However, you are not necessarily restricted by it. The opening is preferably provided in both the positive electrode lead portion and the negative electrode lead portion, and the opening portion uses a plurality of the positive electrode and the negative electrode. If a negative electrode and a negative electrode are provided in a lead portion of an electrode of a laminated polymer electrolyte battery having a laminated electrode group in which a polymer electrolyte layer is interposed between them, a space between the positive electrode and the negative electrode is provided. When connected in parallel, the effect is more suitably exhibited. However, a unit cell in which one positive electrode and one negative electrode are laminated with one polymer electrolyte layer interposed
Of course, the opening may be provided in the lead portion of the electrode of the sheet-type polymer electrolyte battery which is used alone.
【００１５】正極合剤や負極合剤としては、通常、活物
質と必要に応じて添加される電子伝導助剤やバインダー
などで構成されるが、本発明のポリマー電解質電池にお
いては、正極や負極もゲル状ポリマー電解質を含んだも
のにする場合があり、そのような場合には、通常の活物
質や電子伝導助剤、バインダーなど以外にも、ゲル状ポ
リマー電解質を含んで構成される。ただし、そのような
正極合剤や負極合剤の調製時には、ゲル状ポリマー電解
質はゲル化によりゲル状ポリマー電解質を構成すること
になるポリマーまたはモノマーと重合開始剤などを含有
する電解液の状態で調製される。The positive electrode mixture and the negative electrode mixture are usually composed of an active material and, if necessary, an electron conduction aid and a binder. In the polymer electrolyte battery of the present invention, the positive electrode mixture and the negative electrode mixture are used. May also contain a gel polymer electrolyte. In such a case, it is configured to contain a gel polymer electrolyte in addition to a usual active material, an electron conduction aid, a binder, and the like. However, when preparing such a positive electrode mixture or a negative electrode mixture, the gel polymer electrolyte is in the state of an electrolytic solution containing a polymer or a monomer and a polymerization initiator, etc., which will constitute the gel polymer electrolyte by gelation. Prepared.
【００１６】[0016]
【実施例】つぎに、実施例を挙げて本発明により具体的
に説明する。ただし、本発明はそれらの実施例のみに限
定されるものではない。Next, the present invention will be described specifically with reference to examples. However, the present invention is not limited to only these examples.
【００１７】実施例１ まず、次の、、に示すように、正極、負極、隔離
体となるポリマー電解質層を作製した。Example 1 First, as shown in the following, a positive electrode, a negative electrode, and a polymer electrolyte layer serving as a separator were prepared.
【００１８】正極：ＬｉＣｏＯ2 粉末４０重量部、鱗
片状黒鉛粉末８重量部およびポリフッ化ビニリデン（以
下、「ＰＶｄＦ」と略す）粉末５重量部を乾式で混合し
た後、さらに１．２２Ｍ（ｍｏｌ／ｌ）のＬｉＰＦ6 を
含むエチレンカーボネート／プロピレンカーボネート
（以下、「ＥＣ／ＰＣ」と略す）（５０／５０）溶液２
５重量部を加えて混合して調製した正極合剤含有ペース
トを、集電体となる厚さ２５μｍのアルミニウム箔の両
面にそれぞれ７５μｍの厚さに塗布した後、１２０℃で
２０分間加熱してアルミニウム箔の両面に正極合剤層を
形成することにより（上記加熱によりＰＶｄＦが溶融
し、温度が低下すると上記ＰＶｄＦがゲル化し、その際
に溶媒も含み全体がＰＶｄＦに取り込まれた状態で非流
動化して柔軟性のある正極合剤層が形成される）、シー
ト状の正極を作製した。この正極はいわゆる両面塗布正
極である。また、これとは別に、積層電極群の最外層に
配置するための正極として、アルミニウム箔の片面に上
記正極合剤含有ペーストを塗布し、上記と同様に加熱し
て集電体の片面のみに正極合剤層を形成することによ
り、いわゆる片面塗布正極も作製した。ただし、いずれ
の正極においても、リード部にする部分には正極合剤含
有ペーストを塗布せず、アルミニウム箔を露出させてお
いた。また、上記ＥＣ／ＰＣ（５０／５０）はエチレン
カーボネート（ＥＣ）とプロピレンカーボネート（Ｐ
Ｃ）との比が体積比で５０：５０の混合溶媒であること
を示している。Positive electrode: 40 parts by weight of LiCoO 2 powder, 8 parts by weight of flaky graphite powder and 5 parts by weight of polyvinylidene fluoride (hereinafter abbreviated as “PVdF”) powder were dry-mixed, and further mixed at 1.22 M (mol / mol). 1) Ethylene carbonate / propylene carbonate (hereinafter abbreviated as “EC / PC”) (50/50) solution 2 containing LiPF 6
The paste containing the positive electrode mixture prepared by adding and mixing 5 parts by weight was applied to both sides of a 25 μm-thick aluminum foil serving as a current collector to a thickness of 75 μm, and then heated at 120 ° C. for 20 minutes. By forming a positive electrode mixture layer on both sides of the aluminum foil (PVdF is melted by the above-mentioned heating, and when the temperature is lowered, the above-mentioned PVdF is gelled. To form a flexible positive electrode mixture layer), thereby producing a sheet-shaped positive electrode. This positive electrode is a so-called double-sided coated positive electrode. Separately, the positive electrode mixture-containing paste is applied to one surface of an aluminum foil as a positive electrode to be arranged on the outermost layer of the laminated electrode group, and heated in the same manner as described above to only one surface of the current collector. By forming the positive electrode mixture layer, a so-called single-sided coated positive electrode was also manufactured. However, in any positive electrode, the positive electrode mixture-containing paste was not applied to a portion to be a lead portion, and the aluminum foil was exposed. The above EC / PC (50/50) is composed of ethylene carbonate (EC) and propylene carbonate (P
The ratio with C) is 50:50 by volume.
【００１９】負極：球状黒鉛粉末４０重量部、鱗片状
黒鉛粉末４重量部およびＰＶｄＦ粉末５重量部を乾式で
混合した後、さらに１．２２ＭのＬｉＰＦ6 を含むＥＣ
／ＰＣ（５０／５０）溶液５重量部を加えて混合して調
製した負極合剤含有ペーストを、集電体となる厚さ２０
μｍの銅箔の両面にそれぞれ７５μｍの厚さに塗布した
後、１２０℃で２０分間加熱して銅箔の両面に負極合剤
層を形成することにより、シート状のいわゆる両面塗布
負極を作製した。また、正極の場合と同様に、積層電極
群の最外層に配置するための負極として、銅箔の片面に
上記負極合剤含有ペーストを塗布し、上記と同様に加熱
して集電体の片面のみに負極合剤層を形成することによ
り、いわゆる片面塗布負極を作製した。ただし、いずれ
のシート状負極においても、リード部にする部分には活
物質含有ペーストを塗布せず、銅箔を露出させておい
た。Negative electrode: 40 parts by weight of spheroidal graphite powder, 4 parts by weight of flake graphite powder and 5 parts by weight of PVdF powder are dry-mixed, and then EC containing 1.22 M of LiPF 6 is further added.
A negative electrode mixture-containing paste prepared by adding and mixing 5 parts by weight of a / PC (50/50) solution was used to form a current collector having a thickness of 20%.
After applying a thickness of 75 μm to both sides of the copper foil of μm, respectively, and heating at 120 ° C. for 20 minutes to form a negative electrode mixture layer on both sides of the copper foil, a sheet-shaped so-called double-sided coated negative electrode was produced. . As in the case of the positive electrode, the negative electrode mixture-containing paste is applied to one surface of a copper foil as a negative electrode to be disposed on the outermost layer of the laminated electrode group, and heated in the same manner as described above to form one surface of the current collector. A so-called single-sided coated negative electrode was prepared by forming the negative electrode mixture layer only on the negative electrode mixture layer. However, in any of the sheet negative electrodes, the active material-containing paste was not applied to the portion to be the lead portion, and the copper foil was exposed.
【００２０】ポリマー電解質層：２−エトキシエチル
アクリレート５０重量部、トリエチレングリコールジメ
タクリレート１３重量部およびエチレングリコールエチ
ルカーボネートメタクリレート３３重量部を混合した
後、さらに過酸化ベンゾイル５重量部および１．２２Ｍ
のＬｉＰＦ6 を含むＥＣ／ＰＣ（５０／５０）溶液３５
重量部を加えて混合し、過酸化ベンゾイルが完全に溶解
した後、その中に厚さ６０μｍ、坪量３０ｇ／ｍ2 のポ
リブチレンテレフタレート不織布を浸漬した。溶液が上
記不織布に完全に浸潤した後、浸漬後の不織布を７５μ
ｍの隙間を有する２枚のガラス板の間に挟み込み、７５
℃で２０分間加熱してシート状ポリマー電解質層を作製
した。Polymer electrolyte layer: After mixing 50 parts by weight of 2-ethoxyethyl acrylate, 13 parts by weight of triethylene glycol dimethacrylate and 33 parts by weight of ethylene glycol ethyl carbonate methacrylate, 5 parts by weight of benzoyl peroxide and 1.22 M
EC / PC (50/50) solution 35 containing LiPF 6
After the benzoyl peroxide was completely dissolved, a polybutylene terephthalate nonwoven fabric having a thickness of 60 μm and a basis weight of 30 g / m 2 was immersed therein. After the solution completely infiltrates the nonwoven fabric, the immersed nonwoven fabric is 75μ
sandwiched between two glass plates having a gap of
It heated at 20 degreeC for 20 minutes, and produced the sheet-shaped polymer electrolyte layer.
【００２１】上記正極は両面塗布正極を３枚用い、片面
塗布正極を１枚用い、負極は両面塗布負極を３枚用い、
片面塗布負極を１枚用い、また、ポリマー電解質層は７
枚用いて、それらの正極、負極、ポリマー電解質層を、
負極、ポリマー電解質層、正極、………負極、ポリマー
電解質層、正極の順に、正極４枚、負極４枚、ポリマー
電解質層７枚を積層し、積層電極群を作製した。The positive electrode uses three double-sided coated positive electrodes, one single-sided coated positive electrode, and the negative electrode uses three double-sided coated negative electrodes.
One single-sided negative electrode was used, and the polymer electrolyte layer was 7
Using the positive electrode, the negative electrode, the polymer electrolyte layer,
A negative electrode, a polymer electrolyte layer, a positive electrode,..., A negative electrode, a polymer electrolyte layer, and a positive electrode were sequentially laminated with four positive electrodes, four negative electrodes, and seven polymer electrolyte layers to prepare a laminated electrode group.
【００２２】図１に上記積層電極群の平面図を模式的に
示す。上記積層電極群は、正極４枚、ポリマー電解質層
７枚および負極４枚で構成されるが、平面として視認で
きるのは、そのうちの最上部の正極１、ポリマー電解質
層３の一部、負極２の一部であるが、この図１に基づい
て、正極１、負極２、ポリマー電解質層３を説明する
と、次の通りである。FIG. 1 schematically shows a plan view of the above-mentioned laminated electrode group. The laminated electrode group is composed of four positive electrodes, seven polymer electrolyte layers, and four negative electrodes. The top surface of which can be visually recognized is the uppermost positive electrode 1, a part of the polymer electrolyte layer 3, and the negative electrode 2. The positive electrode 1, the negative electrode 2, and the polymer electrolyte layer 3 will be described below with reference to FIG.
【００２３】正極１は最上部にあって、ドットを付して
示され、その下にポリマー電解質層３が配置し、さらに
その下に負極２が配置している。そして、正極１より負
極２の方が面積が大きく、その負極２よりポリマー電解
質層３の方が面積が大きく、ポリマー電解質層３は正極
１と負極２とを隔離する機能も有している。The positive electrode 1 is at the uppermost portion and is shown with a dot, under which the polymer electrolyte layer 3 is arranged, and further below this, the negative electrode 2 is arranged. The area of the negative electrode 2 is larger than that of the positive electrode 1, the area of the polymer electrolyte layer 3 is larger than that of the negative electrode 2, and the polymer electrolyte layer 3 also has a function of separating the positive electrode 1 from the negative electrode 2.
【００２４】正極１のリード部１ａは正極１の集電体で
あるアルミニウム箔の露出部で構成され、このリード部
１ａの幅方向のほぼ中央部に開孔部１ｂが設けられてい
る。この実施例１の電池では、溶接箇所は後に図４に基
づいて説明するように２箇所であり、開孔部１ｂは上記
２箇所の溶接箇所の間に設けられている。また、この図
１では見ることができないが、他の３枚の正極１のリー
ド部１ａにも上記同様の開孔部１ｂが設けられている。The lead portion 1a of the positive electrode 1 is constituted by an exposed portion of an aluminum foil which is a current collector of the positive electrode 1, and an opening 1b is provided at a substantially central portion in the width direction of the lead portion 1a. In the battery of the first embodiment, the number of welding locations is two, as will be described later with reference to FIG. 4, and the opening 1b is provided between the two welding locations. Although not visible in FIG. 1, the lead portions 1a of the other three positive electrodes 1 are also provided with the same apertures 1b as described above.
【００２５】負極２のリード部２ａは負極２の集電体で
ある銅箔の露出部で構成され、このリード部２ａの幅方
向のほぼ中央部に開孔部２ｂが設けられている。そし
て、この実施例１の電池では、溶接箇所は後に図４に基
づいて説明するように２箇所であり、開孔部２ｂは上記
２箇所の溶接箇所の間に設けられている。また、他の３
枚の負極２のリード部２ａにも上記同様の開孔部２ｂが
設けられているThe lead portion 2a of the negative electrode 2 is constituted by an exposed portion of a copper foil serving as a current collector of the negative electrode 2, and an opening 2b is provided substantially at the center in the width direction of the lead portion 2a. In the battery of the first embodiment, there are two welding locations, as will be described later with reference to FIG. 4, and the opening 2b is provided between the two welding locations. In addition, other three
The lead portion 2a of the negative electrode 2 is also provided with an opening 2b similar to the above.
【００２６】上記正極１のサイズは長さ×幅が７０ｍｍ
×４０ｍｍの四角形状であり、そのリード部１ａのサイ
ズは長さ×幅が１４ｍｍ×１０ｍｍで、開孔部１ｂはリ
ード部１ａの幅方向の中央部でかつリード部１ａの自由
端から最奥部が８ｍｍの位置に達するように長軸／短軸
比の大きい略楕円状に設けられている。The size of the positive electrode 1 is 70 mm in length × width.
The lead portion 1a has a size of length × width of 14 mm × 10 mm, and the opening portion 1b is located at the center of the lead portion 1a in the width direction and is deepest from the free end of the lead portion 1a. The portion is provided in a substantially elliptical shape having a long axis / short axis ratio so as to reach a position of 8 mm.
【００２７】また、負極２のサイズは長さ×幅が７２ｍ
ｍ×４２ｍｍであり、そのリード部２ａのサイズは長さ
×幅が１３ｍｍ×１０ｍｍで、開孔部２ｂはリード部１
ａの幅方向の中央部でかつリード部２ａの自由端から最
奥部が８ｍｍの位置に達するように長軸／短軸比の大き
い略楕円状に設けられている。The size of the negative electrode 2 is 72 m in length × width.
m × 42 mm, and the size of the lead 2 a is 13 mm × 10 mm in length × width, and the opening 2 b is the lead 1
It is provided in a substantially elliptical shape having a large ratio of the major axis to the minor axis so that the center portion in the width direction of a and the innermost portion from the free end of the lead portion 2a reach a position of 8 mm.
【００２８】ポリマー電解質層３のサイズは上記正極１
および負極２よりも大きい四角形状で、長さ×幅が７４
ｍｍ×４４ｍｍである。The size of the polymer electrolyte layer 3 is the same as that of the positive electrode 1 described above.
And a square shape larger than the negative electrode 2 and having a length × width of 74
mm × 44 mm.
【００２９】外部端子としての正極端子には、厚さ１０
０μｍで長さ２０ｍｍ、幅１０ｍｍのアルミニウム板を
用い、図２に示すように、このアルミニウム板からなる
正極端子５には、上記正極１のリード部１ａと同様の開
孔部５ａが設けられている。ただし、この正極端子には
上記開孔部に代えて切り欠きを設けてもよい。The positive electrode terminal as an external terminal has a thickness of 10
As shown in FIG. 2, a positive electrode terminal 5 made of an aluminum plate having a length of 20 mm and a width of 10 mm is provided with an opening 5a similar to the lead 1a of the positive electrode 1 as shown in FIG. I have. However, a cutout may be provided in the positive electrode terminal instead of the opening.
【００３０】また、外部端子としての負極端子には、厚
さ１００μｍで長さ２０ｍｍ、幅１０ｍｍの銅板を用
い、図３に示すように、この銅板からなる負極端子６に
は、上記負極２のリード部２ａと同様の開孔部６ａが設
けられている。ただし、この負極端子には上記開孔部に
代えて切り欠きを設けてもよい。As a negative electrode terminal as an external terminal, a copper plate having a thickness of 100 μm, a length of 20 mm and a width of 10 mm was used, and as shown in FIG. An opening 6a similar to the lead 2a is provided. However, a cutout may be provided in the negative electrode terminal instead of the opening.
【００３１】そして、上記正極端子５の開孔部５ａの上
に積層電極群の４枚の正極１のリード部１ａの開孔部１
ｂが重なるようにして、４枚のリード部１ａを正極端子
５の上に載置し、これら４枚のリード部１ａと正極端子
５とを電気溶接することによって接続している。溶接箇
所は、図４に示すように、１ｃと１ｄで示す２箇所であ
り、溶接箇所１ｃ、溶接箇所１ｄとも、リード部１ａの
自由端から４ｍｍのところに位置している。そして、リ
ード部１ａの開孔部１ｂ、正極端子５の開孔部５ａと
も、上記溶接箇所１ｃと溶接箇所１ｄとの間に位置して
いる。The openings 1a of the leads 1a of the four positive electrodes 1 of the laminated electrode group are placed on the openings 5a of the positive electrode terminal 5.
The four lead portions 1a are placed on the positive electrode terminal 5 so that b overlaps, and the four lead portions 1a and the positive electrode terminal 5 are connected by electric welding. As shown in FIG. 4, there are two welding locations indicated by 1c and 1d. Both the welding location 1c and the welding location 1d are located 4 mm from the free end of the lead 1a. The opening 1b of the lead 1a and the opening 5a of the positive electrode terminal 5 are also located between the above-mentioned welded portions 1c and 1d.
【００３２】上記電気溶接時の条件は、第１回目の溶接
（例えば、溶接箇所１ｃでの溶接）、第２回目の溶接
（例えば、溶接箇所１ｄでの溶接）とも、電圧１７Ｖ、
時間１ミリ秒であった。また、負極端子６の開孔部６ａ
の上に積層電極群の４枚の負極２のリード部２ａの開孔
部２ｂが重なるようにして、４枚のリード部２ａを負極
端子６の上に載置し、これら４枚のリード部２ａと負極
端子６とを電気溶接することによって接続している。溶
接箇所は、図４に示すように、２ｃと２ｄで示す２箇所
であり、溶接箇所２ｃ、溶接箇所２ｄとも、リード部２
ａの自由端から４ｍｍのところに位置している。そし
て、リード部２ａの開孔部２ｂ、負極端子６の開孔部６
ａとも、上記溶接箇所２ｃと溶接箇所２ｄとの間に位置
している。上記電気溶接時の条件は、第１回目の溶接
（例えば、溶接箇所２ｃでの溶接）、第２回目の溶接
（例えば、溶接箇所２ｄでの溶接）とも、電圧１８Ｖ、
時間１ミリ秒であった。The conditions for the electric welding are as follows: the first welding (for example, welding at the welding location 1c) and the second welding (for example, welding at the welding location 1d), a voltage of 17 V;
The time was 1 millisecond. The opening 6a of the negative electrode terminal 6
The four lead portions 2a are placed on the negative electrode terminal 6 such that the opening portions 2b of the lead portions 2a of the four negative electrodes 2 of the stacked electrode group overlap with each other. 2a and the negative electrode terminal 6 are connected by electric welding. As shown in FIG. 4, there are two welding locations indicated by 2c and 2d, and both the welding location 2c and the welding location 2d are the lead 2
a is located 4 mm from the free end. Then, the opening 2b of the lead 2a and the opening 6 of the negative electrode terminal 6 are formed.
a is located between the welding point 2c and the welding point 2d. The conditions at the time of the electric welding include a voltage of 18 V for the first welding (for example, welding at the welding location 2c) and a second welding (for example, welding at the welding location 2d).
The time was 1 millisecond.
【００３３】上記のように、リード部１ａに開孔部１ｂ
を設けて電気溶接すれば、例えば、溶接箇所１ｃでの電
気溶接の結果、低抵抗部ができても、溶接箇所１ｄは上
記溶接箇所１ｃとは開孔部１ｂで部分的に切り離されて
いるので、その溶接箇所１ｃでの低抵抗部による影響が
低減され、溶接箇所１ｄでも大きい溶接強度が得られ
る。また、負極２側においても、負極２のリード部２ａ
に開孔部２ｂを設けているので、例えば溶接箇所２ｃで
の電気溶接の結果、低抵抗部ができても、溶接箇所２ｄ
は上記溶接箇所２ｃとは開孔部２ｂで部分的に切り離さ
れているので、その溶接箇所２ｃでの低抵抗部による影
響が低減され、溶接箇所２ｄでも大きな溶接強度が得ら
れる。なお、図１〜図４はいずれも模式的に示したもの
であり、各構成部材の寸法比は必ずしも正確ではない。As described above, the opening 1b is formed in the lead 1a.
Is provided, for example, even if a low resistance portion is formed as a result of the electric welding at the welding location 1c, the welding location 1d is partially separated from the welding location 1c at the opening 1b. Therefore, the influence of the low resistance portion at the welding point 1c is reduced, and a large welding strength is obtained at the welding point 1d. Also on the negative electrode 2 side, the lead 2a of the negative electrode 2
Is provided with an opening 2b, for example, even if a low resistance portion is formed as a result of electric welding at the welding location 2c, the welding location 2d
Is partially separated from the above-mentioned welding portion 2c at the opening 2b, so that the effect of the low resistance portion at the welding portion 2c is reduced, and a large welding strength is obtained at the welding portion 2d. In addition, FIGS. 1 to 4 are all schematic diagrams, and the dimensional ratio of each component is not always accurate.
【００３４】上記のように外部端子とリード部とを電気
溶接によって接続した積層電極群を、ナイロンフィルム
−アルミニウムフィルム−変性ポリオレフィンフィルム
の３層ラミネートフィルムからなる外装体で外装して密
閉することによって、積層形ポリマー電解質電池を作製
した。The laminated electrode group in which the external terminals and the leads are connected by electric welding as described above is packaged and sealed with a package consisting of a three-layer laminate film of a nylon film-aluminum film-modified polyolefin film. Thus, a laminated polymer electrolyte battery was manufactured.
【００３５】比較例１ 正極１のリード部１ａおよび負極２のリード部２ａに開
孔部を設けなかった以外は、実施例１と同様に積層形ポ
リマー電解質電池を作製した。Comparative Example 1 A laminated polymer electrolyte battery was manufactured in the same manner as in Example 1 except that no opening was provided in the lead portion 1a of the positive electrode 1 and the lead portion 2a of the negative electrode 2.
【００３６】上記実施例１および比較例１の電池につい
て、正極１のリード部１ａと正極端子５との間の溶接強
度および負極２のリード部２ａと負極端子６との間の溶
接強度を測定し、また、電池の落下テストを行った。そ
の結果を表１に示す。なお、上記溶接強度の測定は、プ
ッシュプルスケールによって行い、また、落下テスト
は、それぞれ１００個の電池を高さ１８０ｃｍの位置か
らコンクリート上に落下させて、電極のリード部と外部
端子との溶接部分の剥離の有無を調べることによって行
なった。この落下テストによる溶接部分の剥離に関し
て、表１には分母に試験に供した電池個数を示し、分子
に溶接部分の剥離が生じた電池個数を示す態様で表示し
た。For the batteries of Example 1 and Comparative Example 1, the welding strength between the lead 1a of the positive electrode 1 and the positive electrode terminal 5 and the welding strength between the lead 2a of the negative electrode 2 and the negative electrode terminal 6 were measured. Then, a drop test of the battery was performed. Table 1 shows the results. The welding strength was measured by a push-pull scale, and the drop test was performed by dropping 100 batteries from concrete at a height of 180 cm onto concrete, and welding the electrode leads to the external terminals. This was performed by examining the presence or absence of peeling of the portion. Regarding the peeling of the welded portion by the drop test, Table 1 shows the number of batteries subjected to the test in the denominator and the number of batteries where the welded portion peeled off in the numerator.
【００３７】[0037]
【表１】 [Table 1]
【００３８】表１に示す結果から明らかなように、実施
例１は、比較例１に比べて、正極側、負極側とも、リー
ド部と外部端子との間の接続強度（溶接強度）が高く、
また、落下テストでも、接続部分（溶接部分）の剥離を
生じるものがなかった。As is clear from the results shown in Table 1, in Example 1, the connection strength (welding strength) between the lead portion and the external terminal was higher on both the positive electrode side and the negative electrode side than Comparative Example 1. ,
Further, in the drop test, none of the test pieces caused peeling of the connection portion (weld portion).
【００３９】[0039]
【発明の効果】以上説明したように、本発明によれば、
電極のリード部の接続強度（溶接強度）が高く、電池性
能の信頼性の高いポリマー電解質電池を提供することが
できた。As described above, according to the present invention,
The connection strength (welding strength) of the electrode lead was high, and a polymer electrolyte battery having high reliability in battery performance could be provided.
【図１】本発明の実施例１の積層形ポリマー電解質電池
における積層電極群を模式的に示す平面図である。FIG. 1 is a plan view schematically showing a stacked electrode group in a stacked polymer electrolyte battery according to a first embodiment of the present invention.
【図２】本発明の実施例１の積層形ポリマー電解質電池
に用いる正極端子を模式的に示す平面図である。FIG. 2 is a plan view schematically showing a positive electrode terminal used in the laminated polymer electrolyte battery of Example 1 of the present invention.
【図３】本発明の実施例１の積層形ポリマー電解質電池
に用いる負極端子を模式的に示す平面図である。FIG. 3 is a plan view schematically showing a negative electrode terminal used in the laminated polymer electrolyte battery of Example 1 of the present invention.
【図４】本発明の実施例１の積層形ポリマー電解質電池
における積層電極群の外部端子と接続後の状態を模式的
に示す平面図である。FIG. 4 is a plan view schematically showing a state after connection with external terminals of a laminated electrode group in the laminated polymer electrolyte battery of Example 1 of the present invention.
１ 正極 １ａ リード部 １ｂ 開孔部 ２ 負極 ２ａ リード部 ２ｂ 開孔部 ３ ポリマー電解質層 ５ 正極端子 ６ 負極端子 DESCRIPTION OF SYMBOLS 1 Positive electrode 1a Lead part 1b Opening part 2 Negative electrode 2a Lead part 2b Opening part 3 Polymer electrolyte layer 5 Positive terminal 6 Negative terminal
Claims (2)
し、上記正極または負極のうち少なくとも一方の電極の
リード部を複数箇所電気溶接することによって接続する
ポリマー電解質電池において、上記リード部の溶接箇所
間に開孔部を設けたことを特徴とするポリマー電解質電
池。1. A polymer electrolyte battery having a positive electrode, a negative electrode, and a polymer electrolyte layer, wherein a lead portion of at least one of the positive electrode and the negative electrode is connected by electric welding at a plurality of positions. A polymer electrolyte battery, characterized by having an opening between them.
て、その複数枚の正極と複数枚の負極とをそれぞれの間
にポリマー電解質層を介在させて積層した積層電極群を
有する請求項１記載のポリマー電解質電池。2. A laminated electrode group comprising a plurality of positive electrodes and a plurality of negative electrodes, each comprising a plurality of positive electrodes and a plurality of negative electrodes, each having a polymer electrolyte layer interposed therebetween. Polymer electrolyte battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11036932A JP2000243374A (en) | 1999-02-16 | 1999-02-16 | Polymer electrolyte battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11036932A JP2000243374A (en) | 1999-02-16 | 1999-02-16 | Polymer electrolyte battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000243374A true JP2000243374A (en) | 2000-09-08 |
Family
ID=12483541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11036932A Withdrawn JP2000243374A (en) | 1999-02-16 | 1999-02-16 | Polymer electrolyte battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000243374A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007311167A (en) * | 2006-05-18 | 2007-11-29 | Hitachi Vehicle Energy Ltd | Secondary battery, battery pack, and battery module |
| JP2011108534A (en) * | 2009-11-19 | 2011-06-02 | Nec Energy Devices Ltd | Laminated secondary battery |
| KR101319385B1 (en) * | 2009-11-25 | 2013-10-17 | 삼성에스디아이 주식회사 | Rechargeable battery |
| JP2014107146A (en) * | 2012-11-28 | 2014-06-09 | Toyota Industries Corp | Electricity storage device |
| WO2014112296A1 (en) * | 2013-01-15 | 2014-07-24 | 日立マクセル株式会社 | Secondary battery |
| CN104638265A (en) * | 2015-01-29 | 2015-05-20 | 徐卓辉 | Conductive connecting piece for battery and preparation method of conductive connecting piece |
-
1999
- 1999-02-16 JP JP11036932A patent/JP2000243374A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007311167A (en) * | 2006-05-18 | 2007-11-29 | Hitachi Vehicle Energy Ltd | Secondary battery, battery pack, and battery module |
| JP2011108534A (en) * | 2009-11-19 | 2011-06-02 | Nec Energy Devices Ltd | Laminated secondary battery |
| KR101319385B1 (en) * | 2009-11-25 | 2013-10-17 | 삼성에스디아이 주식회사 | Rechargeable battery |
| US9099691B2 (en) | 2009-11-25 | 2015-08-04 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| JP2014107146A (en) * | 2012-11-28 | 2014-06-09 | Toyota Industries Corp | Electricity storage device |
| WO2014112296A1 (en) * | 2013-01-15 | 2014-07-24 | 日立マクセル株式会社 | Secondary battery |
| JP2014137862A (en) * | 2013-01-15 | 2014-07-28 | Hitachi Maxell Ltd | Secondary battery |
| CN104638265A (en) * | 2015-01-29 | 2015-05-20 | 徐卓辉 | Conductive connecting piece for battery and preparation method of conductive connecting piece |
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| Date | Code | Title | Description |
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| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20060509 |