JP3355948B2 - Prismatic secondary battery and its preparation method - Google Patents

Prismatic secondary battery and its preparation method

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Publication number
JP3355948B2
JP3355948B2 JP21181796A JP21181796A JP3355948B2 JP 3355948 B2 JP3355948 B2 JP 3355948B2 JP 21181796 A JP21181796 A JP 21181796A JP 21181796 A JP21181796 A JP 21181796A JP 3355948 B2 JP3355948 B2 JP 3355948B2
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separator
secondary battery
bag
prismatic secondary
negative electrode
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JPH1055795A (en
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達雄 堀場
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新神戸電機株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation
    • Y02E60/122Lithium-ion batteries

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は多数枚の電極群から構成される角形二次電池及びその製造法に関する。 About prismatic secondary battery and its preparation method consists of [belongs Technical Field of the Invention The present invention is a large number of sheets of the electrode group.

【0002】 [0002]

【従来の技術】角形二次電池としては、例えば、ニッケル−カドミウム電池、ニッケル−水素電池などの小形二次電池あるいは鉛蓄電池が実用化された実用技術である。 2. Description of the Related Art As prismatic secondary battery, for example, nickel - cadmium battery, a nickel - compact rechargeable battery or a lead acid battery, such as hydrogen battery is practically used practicality techniques. これらにおける、セパレ−タの使用形態を見ると、 Definitive to these, separators - Looking at the usage of the data,
ニッケル−カドミウム電池、ニッケル−水素電池では、 Nickel - Cadmium batteries, nickel - the hydrogen battery,
電池が小形小容量であり、また、電極自体の強度が十分であるためセパレ−タはただ電極よりやや大きめのものを正極と負極の間に介在させているだけである。 Battery is small small capacity, and because the strength of the electrode itself is enough separator - data are only just slightly by interposing a larger thing between the positive electrode and the negative electrode from the electrode. 一方、 on the other hand,
一部の鉛蓄電池では機械的に圧着した袋状セパレ−タを用いる方式のものも知られている(特開平7−3026 Some lead-acid battery mechanically crimped bag-shaped separator - are also known of a type using a motor (JP-A 7-3026
16号公報)。 16 JP). また、近年開発されたロッキングチェア型リチウム二次電池では電極が薄く、それを多数枚積層する角形密閉型二次電池では電極間の短絡を回避するために袋状に加工したセパレ−タを用いることが提案されている。 Further, the rocking chair type lithium secondary battery has been developed recently thin electrode, separator and processed into a bag shape in order to avoid a short circuit between the electrodes in prismatic sealed secondary battery using it stacking multiple sheets - using data it has been proposed. なお、これらの袋状セパレ−タでは、もとになるセパレ−タ膜は不織布状ではなく微孔膜状のものが一般的である。 Incidentally, these bag-like separator - the data, underlying separator - data membranes are generally those microporous membrane rather than the nonwoven fabric.

【0003】 [0003]

【発明が解決しようとする課題】上記従来技術に記したロッキングチェア型のリチウム二次電池には、袋状に加工したセパレ−タの加工技術が明確に規定されていないので、実用的に十分な固着強度あるいは、耐久性は保証されていない。 A rocking chair type lithium secondary battery was noted INVENTION It is an object to be solved The prior art separator was processed into a bag - since processing techniques data is not clearly defined, practically sufficient do adhesive strength or durability is not guaranteed. 本発明の解決しようとする課題は、袋状にセパレ−タを加工する技術において、上記従来技術では不明確な加工技術を明確にすることにある。 The problems to be solved by the present invention, separator into a bag - in the art of processing the data, the above conventional art is to clarify ambiguous processing techniques.

【0004】 [0004]

【課題を解決するための手段】上記課題を解決するために、本発明の電極基体上に正極活物質合剤層を形成してなる正極1、電極基体上に負極活物質合剤層を形成してなる負極 、それらの両電極の間に介在するセパレータ、およびそれらの三者にわたって分布する電解液からなる電池構成要素を角形密閉容器内に収納してなる角形二次電池は、正極1と負極2の少なくとも一方を、ポリオレフィン系材料を溶着加工した袋状セパレータ3に収納した構造であって、袋状セパレータ両側部の溶着加工部分4 は、透明な溶着部分と所定の一部に透明でない未 In order to solve the above problems SUMMARY OF THE INVENTION The positive electrode 1 on the electrode substrate of the present invention by forming a positive electrode active material mixture layer, the negative electrode active material mixture layer on the electrode substrate formed anode 2 is formed by a separator interposed between these two electrodes, and housed prismatic secondary battery comprising a battery component consisting electrolyte prismatic sealed container distributed over their tripartite includes a positive electrode 1 and at least one of the negative electrode 2, a structure housing the polyolefin material in fusion bonding the bag-like separator 3, the bag-like separator both sides welded working portion 4 is transparent to a transparent welded portion and a predetermined portion not not
溶着部分が形成されていることを特徴とする。 Wherein the welding portion is formed. 袋状セパレータの溶着加工部分4が透明になるということは、十分に溶着部分が溶着したことであり、これにより実用的に十分な固着強度あるいは、耐久性は確保される。 That fusion bonding portion 4 of the bag-like separator is clear is that sufficient weld part is welded, thereby practically sufficient bond strength or durability is ensured. また、透明であるということは加工作業の不良を発見することが容易になるという特長がある。 Further, there is a feature that makes it easy to find the defective machining operations that it is transparent. すなわち、溶着ののち、目視によって、あるいは光の透過度によって検査することが容易である。 That is, after welding, it is easy to inspect visually, or by transmission of light. 本発明を実施するに当たって、 In the practice of the present invention,
袋状セパレータ両側部の溶着加工部分4の所定の一部に A predetermined portion of the fusion bonded part 4 of the bag-shaped separator both sides
透明でない未溶着部分を形成することにより電極への電解液の浸透を促進しつつ、かつ電極間の短絡を防止するという効果がある。 While facilitating the penetration of the electrolyte into the electrode by forming a non-welded portion is not transparent, and has the effect of preventing short circuit between the electrodes. 袋状セパレータ3のポリオレフィン系材料の具体例はポリエチレン、ポリプロピレンまたはそれらの共存するものであり、かつ延伸などの処理により白色不透明になっている微孔膜である。 Specific examples of the polyolefin material of the bag-shaped separator 3 is polyethylene, is intended to polypropylene or coexistence thereof, and stretching a microporous film that is a white opaque by processing such. セパレータを袋状に溶着加工するには加熱、圧縮による圧着、あるいは加熱と圧縮による圧着の併用などの方法が特に適している。 The separator is fusion bonded to the bag-like heating method, such as the combination of crimping by the crimping, or heat and compression by the compression are particularly suitable. なお、本発明の目的は袋状セパレータに挿入する電極が正極であっても、負極であっても、あるいは正極、負極の両方であっても達せられる。 The object of the present invention is an electrode to be inserted into a bag shape separator be positive, even negative, or positive, also achieved a both negative.

【0005】また袋状セパレータ3に収納された電極の製造法としては、上記溶着加工部分4を有する袋状セパレータ3を予め作製しておき、その後正極あるいは負極あるいは正極、負極の双方を収納する方法が考えられる。 [0005] As a manufacturing method of the bag-shaped separator 3 in the housing electrode had beforehand prepared bag-like separator 3 having the above-described fusion bonding portion 4, and then receiving a positive electrode or negative electrode or positive electrode, both of the negative electrode methods are conceivable. また、セパレータ膜をU字状に折り曲げて電極を包み、U字状に折り曲げた両側部を溶着加工する方法も考えられる。 The wrapped electrodes by bending the separator film in a U-shape, is also conceivable to weld machining both side portions bent in a U-shape. しかし発明はこれらに限定されない。 However, the present invention is not limited thereto.

【0006】 [0006]

【実施例】本発明を炭素系材料を負極に用いるロッキングチェア型の角形リチウム二次電池において実施した。 EXAMPLES The present invention was carried out in the square lithium secondary battery of rocking chair type a carbonaceous material is used for the negative electrode.
本発明を図面にもとづきさらに詳しく説明する。 It will be described in more detail on the basis of the present invention with reference to the drawings. 図2において、1は正極、2は負極であり、この場合正極1は3の袋状セパレ−タに挿入された状態であり、これにより角形電極群が形成される。 2, reference numeral 1 denotes a positive electrode, 2 is negative electrode, a positive electrode 1 in this case 3 of the bag-like separator - a state of being inserted into data, thereby prismatic electrode assembly is formed. 本発明の要点は3の袋状セパレ−タにあり、この構造を適正なものにすることにより本発明の目的が達成される。 Gist of the present invention 3 of the bag-like separator - is in the data, object of the present invention can be achieved by this structure as appropriate. 以下、具体的な実施例及び比較例により更に詳しく説明する。 Hereinafter will be described in more detail by specific examples and comparative examples. (実施例)図2に示した電極を以下のようにして作製した。 The electrode shown in (Example) 2 was prepared as follows. 負極電極基体には厚さ15μmの銅箔を、正極電極基体には厚さ15μmのアルミニウム箔をそれぞれ用いた。 The copper foil of thickness 15μm on the negative electrode substrate, the positive electrode substrate was an aluminum foil having a thickness of 15μm, respectively. 負極電極基体には平均粒径6μmの人造黒鉛粉末のスラリ−を塗布した。 The negative electrode substrate slurry of artificial graphite powder having an average particle diameter of 6 [mu] m - was applied. スラリ−の溶媒には、N−メチルピロリドン(NMP)を、結着材にはポリフッ化ビニリデン(PVDF)をそれぞれ用いた。 Slurry - the solvent, N- a-methyl pyrrolidone (NMP), the binder used polyvinylidene fluoride (PVDF), respectively. 正極電極基体には平均粒径3μmのコバルト酸リチウム(LiCoO 2 )、 The positive electrode substrate of lithium cobaltate having an average particle size of 3μm (LiCoO 2),
導電剤の人造黒鉛粉末、結着材のPVDF、および溶媒のNMPからなるスラリ−を塗布した。 Artificial graphite powder as a conductive agent, PVDF binder material, and a slurry consisting of NMP solvent - was applied. 得られた乾燥状態の電極をさらにロ−ルプレスにより成型し、所定の寸法に切断し電極を得た。 The resulting electrode in a dry state more Russia - molded by Rupuresu, to obtain an electrode was cut to a predetermined size. 正極を袋状セパレータに収納する構成とし、厚さ25μmのポリエチレン材料の微孔膜をU字状に折り曲げて正極を包み、U字状に折り曲げた両側部を熱溶着した。 A structure for accommodating the positive electrode in a bag-like separator, by bending a microporous film of polyethylene material with a thickness of 25μm in a U-shaped wrapping a positive electrode was heat-welded to both side portions bent in a U-shape. 図1に本発明になる袋状セパレ− Bag-like separator according to the present invention in FIG 1 -
タに挿入された正極を示す。 It shows the inserted positive electrode data. 図において1は正極、3は袋状セパレ−タであり、4はその溶着部分である。 1 In the figure the positive electrode, 3 is a bag-shaped separator - a motor, 4 is its welded portion. なお、図の下端部は折り返し部分であるために溶着部分はない。 Incidentally, the lower end portion of the figures are not welded portions for a back portion. 本実施例ではこのときの溶着条件を検討し、溶着するための合わせ面が相互に溶け合うまで加熱した。 In the present embodiment considering the welding conditions at this time, the mating surface for welding is heated to melt together with each other. その結果、白色のセパレ−タの溶着部分が透明になり、このとき、波長500〜700μmの範囲の可視光の透過度が10%以上となった。 As a result, white separator - data welded portion becomes transparent, this time, transmittance of visible light of a wavelength range of 500~700μm becomes 10% or more. このように溶着した袋状セパレ−タに挿入した正極と負極を組み合わせて角形電池を作製した。 To prepare a rectangular battery in combination a positive electrode and the negative electrode inserted into data - thus welded bag-like separator. 電極寸法は55mm×67mmであり、正極18枚と負極19枚からなり、電池容量は3.0Ahとした。 Electrode size is 55 mm × 67 mm, made of 18 sheets positive and negative electrodes 19 sheets, the battery capacity was 3.0 Ah. この電極群を角形金属容器に収納し、電解液を注入し、密閉して密閉電池とした。 The electrode group was housed in a prismatic metal container, the electrolyte solution was injected, was sealed battery was sealed. このようにして得られた電池の20個を高さ1.5mからコンクリ−ト製の床面に10回自然落下させた後、4.2Vと2.8Vの間で1CmAの電流で充放電を10回繰り返し、その後さらに高さ1.5mからコンクリ−ト製の床面に10回自然落下させた後、4.2Vと2.8Vの間で1CmAの電流で充放電を10回繰り返した。 Thus from a height 1.5m twenty resulting cell concrete - After 10 times on a floor made of bets free fall, charged at 4.2V and 2.8V 1 CmA of current between the discharge repeating 10 times, from then further height 1.5m concrete - after 10 times on a floor made of bets by gravity, was repeatedly charged and discharged 10 times between 4.2V and 2.8V at 1CmA current . その結果、最初の1 As a result, first of 1
0回の充放電では放電容量は平均2.97Ahであり、 Discharge capacity is 0 times of charging and discharging is the average 2.97Ah,
その後の10回の充放電でも平均放電容量は2.96A The average discharge capacity in the subsequent 10 times of charge and discharge 2.96A
hであり、大幅な容量低下は見られなかった。 H, and a significant decrease in capacity was observed.

【0007】(比較例)実施例と同様にして電池を製作した。 [0007] was prepared a battery in the same manner as Comparative Example Example. ただし、袋セパレ−タは白色のセパレ−タが透明にならない条件で溶着した。 However, bag separator - other white separator - was welded under the condition that data does not become transparent. その他の条件はすべて実施例と同じである。 The other conditions are the same as in Example. 他の電極の仕様、製法などは上記実施例と同一にして、単三電池を製作した。 Other electrodes specifications, such process is the same as the above embodiment was fabricated AA batteries. 得られた電池の20個を上記実施例と同一条件で、落下−充放電−落下−充放電の試験をした。 Twenty of the resulting cell under the same conditions as the above example, dropped - and the charge-discharge test - charging and discharging - fall. その結果、最初の10回の充放電では放電容量は平均2.97Ahであり、その後の2.97Ah回の充放電でも平均放電容量は2.73A As a result, the discharge capacity in the first 10 cycles of charge and discharge the average 2.97Ah, the average discharge capacity in subsequent 2.97Ah cycles of charge and discharge 2.73A
hであり、若干の容量低下が見られた。 H, and a slight decrease in capacity was observed. また、供試した20個の電池のうち2個が内部短絡を生じ、不安定な開回路電圧を示した。 Also, two of the 20 cells this was subjected occurs an internal short, exhibited unstable open-circuit voltage.

【0008】 [0008]

【発明の効果】本発明により、正極または負極の少なくとも一方を袋状に溶着加工したポリオレフィン系材料からなるセパレータに収納した構造である角形二次電池において、該袋状セパレータ両側部の溶着加工部分に、透明になる条件で溶着して溶着部分を形成すると共に、所 Effect of the Invention] According to the present invention, in the prismatic secondary battery has a structure in which at least one is accommodated in the separator made of fusion bonding polyolefin-based material into a bag of the positive electrode or the negative electrode, welding working portion of the bag-like separator both sides to, thereby forming a welded portion by welding under a condition that becomes transparent, where
定の一部に透明にならない未溶着部分を形成することにより、 電極への電解液の浸透を促進しつつ、かつ急速充放電や衝撃を繰り返しても短絡を起こしにくい堅牢な電池構造が可能となる。 By forming the unwelded portion does not become transparent to some constant, while facilitating the penetration of the electrolyte into the electrode, and even after repeated rapid charging and discharging or impact can robust battery structure hardly causes a short circuit and Become.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明に係る正極を挿入した袋状セパレータとその溶着部分を示す図である。 [1] bag-like separator is inserted a positive electrode according to the present invention as a diagram showing the welding portion.

【図2】本発明に係る電極を用いた角形電池の電極群構成を示す図である。 Is a diagram showing an electrode group structure of prismatic cell using the electrode according to the invention; FIG.

【符号の説明】 DESCRIPTION OF SYMBOLS

1. 1. 正極 2. The positive electrode 2. 負極 3. The negative electrode 3. 袋状セパレータ 4. The bag-shaped separator 4. 袋状セパレータの溶着加工部分 Welding processing part of the bag-shaped separator

Claims (4)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】電極基体上に正極活物質合剤層を形成してなる正極、電極基体上に負極活物質合剤層を形成してなる負極、それらの両電極の間に介在するセパレータ、およびそれらの三者にわたって分布する電解液からなる電池構成要素を角形密閉容器内に収納してなる角形二次電池において、 上記正極と負極の少なくとも一方を、ポリオレフィン系材料を溶着加工した袋状セパレータに収納した構造であって、該袋状セパレータ両側部の溶着加工部分は、透明 1. A electrode substrate on the electrode active material mixture layer positive electrode obtained by forming a negative electrode obtained by forming a negative electrode active material mixture layer on the electrode substrate, a separator interposed between these two electrodes, and the bag-like separator in a battery components made by housing a prismatic sealed vessel prismatic secondary battery comprising an electrolytic solution, in which at least one of the positive electrode and the negative electrode, and fusion bonded polyolefin material distributed over their tripartite a housing structure, the fusion bonding portion of the bag-like separator sides are transparent
    な溶着部分と所定の一部に透明でない未溶着部分が形成 Welded portion and predetermined unwelded portions not transparent part is formed such
    されていることを特徴とする角形二次電池。 Prismatic secondary battery, characterized by being.
  2. 【請求項2】袋状セパレータを構成するポリオレフィン系材料がポリエチレン、ポリプロピレンまたはそれらの共存するものであることを特徴とする請求項1記載の角形二次電池。 2. A polyolefinic material polyethylene constituting the bag-like separator, polypropylene or prismatic secondary battery according to claim 1, wherein a is for their coexistence.
  3. 【請求項3】角形二次電池をリチウムイオン二次電池に適用する請求項1又は2記載の角形二次電池。 3. A prismatic secondary battery according to claim 1 or 2, wherein applying the prismatic secondary battery to a lithium ion secondary battery.
  4. 【請求項4】電極基体上に正極活物質合剤層を形成してなる正極、電極基体上に負極活物質合剤層を形成してなる負極、それらの両電極の間に介在するセパレータ、およびそれらの三者にわたって分布する電解液からなる電池構成要素を角形密閉容器内に収納してなる角形二次電池の製造法において、 上記正極と負極の少なくとも一方が、ポリオレフィン系材料を溶着加工した袋状セパレータに収納されたものであり、前記溶着加工が袋状セパレータを構成するために溶着すべき両側部を加熱又は圧縮又は加熱と圧縮を併用して透明な溶着部分と所定の一部に透明でない未溶着部 4. A obtained by forming on the electrode substrate of the positive electrode active material mixture layer positive electrode, a negative electrode obtained by forming a negative electrode active material mixture layer on the electrode substrate, a separator interposed between these two electrodes, in and cell components a prismatic sealed preparation of prismatic secondary battery comprising housed in a container made from the electrolyte distributed over their tripartite, at least one of the positive electrode and the negative electrode were fusion bonded polyolefin material It has been housed in the bag-like separator, a portion of the transparent welded portion and predetermined by a combination of compression and heating or compression, or heating the side portions to be welded to the welding process constitutes a bag-like separator not welded portion is not transparent
    を形成することである角形二次電池の製造法。 Preparation of prismatic secondary battery is to form a minute.
JP21181796A 1996-08-12 1996-08-12 Prismatic secondary battery and its preparation method Expired - Lifetime JP3355948B2 (en)

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