JPH10199493A - Secondary battery - Google Patents

Secondary battery

Info

Publication number
JPH10199493A
JPH10199493A JP1469697A JP1469697A JPH10199493A JP H10199493 A JPH10199493 A JP H10199493A JP 1469697 A JP1469697 A JP 1469697A JP 1469697 A JP1469697 A JP 1469697A JP H10199493 A JPH10199493 A JP H10199493A
Authority
JP
Japan
Prior art keywords
battery
recess
secondary battery
width
formed
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.)
Pending
Application number
JP1469697A
Other languages
Japanese (ja)
Inventor
Hiroaki Yoshida
吉田  浩明
Original Assignee
Japan Storage Battery Co Ltd
日本電池株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Japan Storage Battery Co Ltd, 日本電池株式会社 filed Critical Japan Storage Battery Co Ltd
Priority to JP1469697A priority Critical patent/JPH10199493A/en
Publication of JPH10199493A publication Critical patent/JPH10199493A/en
Application status is Pending legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0202Cases, jackets or wrappings for small-sized cells or batteries, e.g. miniature battery or power cells, batteries or cells for portable equipment
    • H01M2/0217Cases of prismatic shape

Abstract

PROBLEM TO BE SOLVED: To prevent bulging caused by internal pressure, and enhance charge/ discharge cycle efficiency and space efficiency by forming a recess in the facing side walls, and setting the longitudinal and lateral dimensions of the recess to those of the side walls within the specified range in a battery container for housing an electrode group of a lithium secondary battery formed by stacking and winding a positive sheet and a negative sheet through a separator.
SOLUTION: An electrode group formed by stacking and winding a positive sheet and a negative sheet through a separator is housed in a round square- shaped battery container 8' made of 0.5mm thick aluminum plate, a positive lead 4 and a negative lead 5 are taken out, and a secondary battery is formed. A recess is formed in the facing side walls of the battery container 8', the lateral and longitudinal dimensions a, b to the lateral and longitudinal dimensions c, d are set in the ranges of c≥a≥c/2 and d≥b≥d/2. By setting radius of curvature of the cross section of the recess in the range of 80-250mm, the strength of the battery container 8' against the internal pressure is increased.
COPYRIGHT: (C)1998,JPO

Description

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

【0001】 [0001]

【発明が属する技術分野】本発明は、電子機器の駆動用電源もしくはメモリ保持電源あるいは、電気自動車用電池としての高エネルギー密度でかつ高い安全性を有する二次電池に関するものである。 The present invention relates], the driving power source or memory retention power or the electronic device, to a secondary battery having high energy density and high safety as a battery for electric vehicles.

【0002】 [0002]

【従来の技術】電子機器の急激なる小形軽量化に伴い、 Along with the rapid Naru size and weight of the Background of the Invention electronic devices,
その電源である電池に対して小形で軽量かつ高エネルギー密度で、更に繰り返し充放電が可能な二次電池の開発への要求が高まっている。 Lightweight and high energy density compact the battery which is a power source, there is a growing further repeated requests for the development of a secondary battery which can be charged and discharged. これら要求を満たす二次電池として、有機電解質二次電池が最も有望である。 As a secondary battery to meet these requirements, an organic electrolyte secondary battery is most promising.

【0003】有機電解質二次電池の正極活物質には、二硫化チタンをはじめとしてリチウムコバルト複合酸化物、リチウムニッケル複合酸化物、スピネル型リチウムマンガン酸化物、五酸化バナジウムおよび三酸化モリブデンなどの種々の金属硫化物や金属酸化物が検討されており、負極活物質には、金属リチウムをはじめとしてリチウム合金および炭素材料などが検討されている。 [0003] The positive electrode active material of an organic electrolyte secondary battery, a secondary lithium-cobalt composite oxide of titanium sulfide, beginning, lithium nickel composite oxide, spinel-type lithium manganese oxide, various such vanadium pentoxide and molybdenum trioxide metal sulfides or metal oxides and is considered, the negative electrode active material, lithium alloys and carbon materials have been studied including the metal lithium.

【0004】 [0004]

【発明が解決しようとする課題】従来の電池は、正極シートと負極シートとをセパレーターを介して渦巻き状に巻き回してなる電極群を円筒形容器に収納していたが、 [Problems that the Invention is to Solve Conventional batteries, had housed the electrode group formed by winding spirally through a separator and a positive electrode sheet and negative electrode sheet in a cylindrical container,
電子機器に収納する際や組電池とした場合において、多くの隙間、いわゆるデッドスペースが生ずるという欠点を有していた。 In case of the and the battery pack when stored in electronic equipment, had many gaps, the disadvantage of so-called dead space occurs. 近年、デッドスペースが小さい電池として特開平5-135780号公報に示されるように、正極シートと負極シートとをセパレーターを介して巻き回してなる電極群が、角丸四角形状の横断面を有する電池ケースに収納してなる有機電解質二次電池が提案されたが、充放電サイクルの進行や高温下での貯蔵により著しい電池の膨れと、放電容量の低下が生じるという問題を有していた。 Recently, as shown in JP-A-5-135780 discloses a battery dead space is small, the electrode group formed by winding the positive electrode sheet and negative electrode sheet through the separator, a battery having a rounded rectangular cross section the organic electrolyte secondary battery comprising housed in a case has been proposed, but the swelling and significant battery by storage at progression and high temperature charge-discharge cycle, has a problem that reduction in the discharge capacity occurs.

【0005】近年高密度化が進んでいる電子機器において、電池の膨れは周辺部品の破壊を引き起こし、組電池においては電池間の接続リードの切断や、リードを接続している端子の変形など様々な問題を引き起こす。 [0005] In the electronic apparatus in recent years high density is advanced, the battery swelling causes disruption of the peripheral parts, cutting and connecting leads between the battery in the battery pack, various deformation of terminals connecting the leads cause the problem. この対策として、ケースの板厚を大きくする方法を検討したが、重量および容量当たりのエネルギー密度が低下するという問題が生じた。 As a countermeasure has been considered a method of increasing the thickness of the case, the energy density per weight and volume occurs lowered.

【0006】 [0006]

【課題を解決するための手段】本発明になる二次電池は、巻回してなる電極体が収納される電池ケースを備えてなり、対向する電池ケース側壁には、電極体巻軸に対して平行な凹部が設けられており、前記凹部は、横幅をa及び縦幅をbとし、かつ前記凹部の設けられた側壁の横幅をc及び縦幅をdとすると、c≧a≧c/2かつd Secondary battery according to the present invention SUMMARY OF THE INVENTION may be provided with a battery case that electrode body formed by winding is housed, the battery case side wall opposite, with respect to the electrode body winding shaft is provided with parallel recesses, wherein the recesses, the horizontal width a and the vertical width is b, and the width of the side wall provided with the said recess when the c and the longitudinal width and d, c ≧ a ≧ c / 2 and d
≧b≧d/2なる関係を満足してなることを特徴とする。 And ≧ b ≧ d / 2 composed characterized in that satisfy the relationship.

【0007】第1の発明にかかる第2の発明は、前記凹部は、電極体巻軸に対して垂直となる断面形状が曲率半径80mm〜250mmの円弧状であることを特徴とする。 A second invention according to the first invention, the concave portion, and wherein the cross-sectional shape which is perpendicular to the electrode body winding shaft is arcuate curvature 80Mm~250mm.

【0008】第1又は第2の発明にかかる二次電池において、電極体巻軸と垂直となる断面形状が角丸四角形状の電池ケースを備えてなり、断面形状が直線状の電池ケース側壁には、前記凹部が形成されてなることを特徴とする。 [0008] In the secondary battery according to the first or second aspect of the invention, the cross-sectional shape of the electrode body winding shaft and the vertical is provided with a rounded rectangular battery case, the battery case side wall straight cross-sectional shape It is characterized in that the recess is formed.

【0009】第1、2又は3にかかる第4の発明は、該負極がリチウムイオンを吸蔵、放出可能なリチウムホスト物質を備えてなる有機電解質二次電池であることを特徴とする。 [0009] A fourth invention according to the 1, 2 or 3, characterized in that negative electrode is an organic electrolyte secondary battery comprising comprising absorb lithium ions, the releasable lithium host material.

【0010】 [0010]

【発明の実施の形態】有機電解質二次電池ケース、特に電池ケースの電極体の巻軸に対して垂直な横断面形状が直線部と曲線部とからなる、角丸四角形状(図3参照) DETAILED DESCRIPTION OF THE INVENTION Organic electrolyte secondary battery case, and a straight portion and a curved portion perpendicular cross-sectional shape, particularly for the winding axis of the electrode body of the battery case, rounded square shape (see FIG. 3)
のものが膨れる原因は、下記に示す如くこの種電池系特有の問題であることが発明者の研究により判明した。 The cause of the swell things, it has been found by the inventors of the research is this kind of battery system of specific issues, as shown below.

【0011】有機電解質二次電池の中でも特に負極に炭素材料を用いた電池は、初期充電時および充放電サイクルの進行にともない負極で電解液が分解し、炭酸ガスを主成分とするガスが発生する。 [0011] batteries using a carbon material, particularly the negative electrode among the organic electrolyte secondary battery, the decomposition of the electrolyte solution in the anode with the progress of the initial charging and the charge-discharge cycle, gas generation composed mainly of carbon dioxide to. しかしながら、この種電池は、鉛電池,ニッケルカドミウムおよびニッケル水素電池などの水溶液系二次電池のように負極によるガス吸収がおこなわれず、また電池内に水分が侵入すると、水と活物質との反応により電池性能が低下するため完全密閉化されている。 However, this type battery, reaction of lead batteries, gas absorption is not conducted by the anode as an aqueous secondary battery such as nickel-cadmium and nickel-hydrogen batteries, also the moisture from entering the battery, the water and the active material It is completely seal off because the battery performance is lowered due.

【0012】すなわち、発生したガスは電池内に残留するため、ガス発生の進行とともに電池内圧が増大し、横断面が角丸四角形状の電池においては強度の小さい直線部が歪んで電池の膨れが発生する。 Namely, since the generated gas remaining in the battery, the battery internal pressure increases with the progress of gas generation, the battery swelling is distorted less straight portion strength in cross-section with rounded corners rectangular battery Occur.

【0013】しかし、本発明のように上記発電要素を収納する電池ケース横断面形状の直線部に断面弧状の凹部を設けた角丸四角形状とすることで、内圧の上昇に対してケース強度が飛躍的に増してケースの膨れが解決できることを明らかにした。 [0013] However, the power generating element by a cross-section rounded rectangular shape provided with arcuate recesses in the linear portion of the battery case cross-sectional shape for accommodating a case strength to increase in the internal pressure as in the present invention swelling of the case increases dramatically revealed can be solved.

【0014】また、前記凹部は、横幅(横の長さ)をa Further, the recess, the width (length of the horizontal) a
及び縦幅(高さ)をbとし、かつ前記凹部の設けられた側壁の横幅(横の長さ)をc及び縦幅(高さ)をdとすると、c≧a≧c/2かつd≧b≧d/2なる関係を満足する必要があることを見いだした。 And the vertical width (height) and is b, and the width of the side wall provided with the said recess (the horizontal length) c and the vertical width (height) and d, c ≧ a ≧ c / 2 and d ≧ b was found ≧ d / 2 the relationship it is necessary to satisfy the. すなわち、凹部の横幅が角丸四角形状の直線部の長さの1/2よりも小さいと、満足な強度が得られず、かつ凹部の長さもケース側壁の縦幅(高さ)の1/2よりも小さいと同様の結果を示した。 That is, the lateral width of the recess is smaller than half the length of the linear portion of the rounded rectangular shape, not satisfactory strength can not be obtained, and the concave portion of the length also height of the case side wall of (height) 1 / It showed similar results with less than 2.

【0015】加えて、凹部の横幅cをa(a=c)とし又は/及び縦幅が少なくとも電極幅と同じ長さであって、かつ電極と対向するケース側壁部分であって、ケース底面から電極群上端部に形成することにより、より好ましい結果が得られた。 [0015] In addition, a lateral width c of the recess a (a = c) and or / and vertical width at least as long as the electrode width and an electrode opposed to the case side wall portion, the bottom of the case by forming the electrode group upper end, better results were obtained.

【0016】さらに、前記凹部の断面形状が曲率半径8 Furthermore, the cross-sectional shape of the recess the radius of curvature 8
0mm〜250mmを有する円弧状とすることにより、 By an arc shape having a 0Mm~250mm,
極めて優れた効果をもたらすことがわかった。 It was found to provide excellent effect.

【0017】尚、本願を断面形状が角形状である電池ケースに応用した場合、同様の効果が得られた。 [0017] When the present sectional shape is applied to the battery case is a square shape, similar effects were obtained. 角形の場合、長側面又は/及び短側面に形成してもよいが、長側面に形成すれば足りる。 For rectangular, but may be formed on the long sides and / or short side, it is sufficient to form the long sides.

【0018】また、本発明でいうところの角丸四角形状とは、対向する1組の直線部と対向する1組の円弧状曲線部を有しており、直線部の両端部、それぞれが各曲線部の端部と連結された形状をいう。 Further, the rounded square shape referred to in the present invention has a pair of arc-shaped curved portion facing the pair of straight portions facing both ends of the linear portion, respectively each It refers to consolidated shape the ends of the curved portion. ここで、曲線部は外側に凸な形状となっている。 Here, the curved portion has a convex shape on the outside.

【0019】直線部の長さ、曲線部の長さは任意に設定できる。 The straight portion of the length, the length of the curved portion can be arbitrarily set.

【0020】さらに、本発明は角丸四角形状と同様にスペース効率に優れるという特徴を有する。 Furthermore, the present invention is characterized of excellent Likewise space efficiency and rounded rectangular shape.

【0021】 [0021]

【実施例】以下に、本発明の一実施例を示す有機電解液二次電池に関し、図面を基にして詳細に説明する。 EXAMPLES Hereinafter, relates to an organic electrolyte secondary battery showing an embodiment of the present invention will be described in detail based on the drawings. いうまでもないが、本発明の思想および主旨を超えない範囲で本実施例に限定されるものではない。 Needless to say, not limited to this embodiment without exceeding the spirit and scope of the present invention.

【0022】図1において、シート状正極1は、厚さ2 [0022] In FIG. 1, the sheet-like positive electrode 1, the thickness 2
0μmのアルミニウム箔にリチウムコバルト酸化物(L Lithium cobalt oxide to the aluminum foil 0 .mu.m (L
iCoO 2 )を導電剤とともに結着剤を用いて保持させたもので、厚さ190μm,幅80mmのものを用いた。 iCoO 2) which was a binder is held with in conjunction with a conductive agent was used thickness 190 .mu.m, those of the width 80 mm.

【0023】シート状負極3は、厚さ14μmの銅箔に、黒鉛を結着剤を用いて保持させたもので、厚さ16 The sheet-shaped negative electrode 3, a copper foil having a thickness of 14 [mu] m, which was allowed to hold the graphite with a binder, thickness 16
0μm,幅83mmのものを用いた。 0μm, it was used as the width of 83mm. セパレーター2 Separator 2
は、材質がポリエチレン製の微多孔膜であり、厚さ25 The material is a microporous film made of polyethylene, thickness 25
μm,幅89mmのものを用いた。 μm, was used as the width of 89mm.

【0024】正極リード4および負極リード5は、正極および負極シートの上部端面の金属箔露出部にそれぞれ5本ずつ超音波溶接により取り付けた。 The positive electrode lead 4 and the negative electrode lead 5 was attached by ultrasonic welding by five each in the metal foil exposed portion of the upper end face of the positive electrode and the negative electrode sheet. 正極1と負極3 The positive electrode 1 and the negative electrode 3
との間にセパレーター2を介在させ、アルミニウム製のパイプ6を巻き芯として円筒形の横断面構造を持つ電極体を作製した。 The separator 2 is interposed between, to prepare an electrode body having a cross sectional structure of the cylindrical as the core winding an aluminum pipe 6.

【0025】電極体の外周をテープ7で固定し、押しつぶして図2のように成形した。 [0025] The outer periphery of the electrode assembly and tape 7 was molded as in FIG. 2 crushed.

【0026】直線部を弧状に湾曲させた角丸四角形状の横断面(電極体の巻き軸に対して垂直な面)を有する電池容器8'に上記電極体を収納して封口後、エチレンカーボネートとジメチルカーボネートとの1:1(体積比)の混合溶媒に、1モルの六フッ化燐酸リチウムを溶解した電解液を減圧注入して、図11のような外観の正極端子9、負極端子10および安全弁11を有する縦2 The rounded square cross-section which is curved in an arc shape with straight portions later by housing the electrode body into the battery container 8 'having a (surface perpendicular to the winding axis of the electrode body) sealing, ethylene carbonate and the dimethyl carbonate 1: 1 mixed solvent (volume ratio), and vacuum inject a 1 molar electrolyte prepared by dissolving lithium hexafluorophosphate in positive terminal 9, the negative terminal 10 of the appearance shown in FIG. 11 and vertical 2 having a safety valve 11
2mm,横60mm,高さ100mmの電池を作製した。 2 mm, lateral 60 mm, a cell height of 100mm was prepared.

【0027】図4に示すように直線部をそれぞれ曲率半径50mm、80mm、150mm、250mm、35 [0027] Each of curvature radius 50mm straight portions as shown in FIG. 4, 80mm, 150mm, 250mm, 35
0mmで窪まし、凹部を形成させた電池12をそれぞれA,B,C,D,Eとし、直線部に凹部を有しない電池12'をFとした。 Better recess at 0 mm, the cell 12 to form a recess and A, B, C, D, and E, respectively, the battery 12 'having no recess was F to the linear portion. ここでは、凹部の横幅をa及び縦幅をbとし、かつ前記凹部の設けられた側壁の縦幅(高さ)をc及び縦幅をdとした場合、凹部の横幅をc= Here, if the width of the recess a and the vertical width and is b, and the longitudinal width of the side wall provided with the said recess (height) was c and the vertical width is d, the width of the recess c =
a、d=bとした。 a, it was d = b. (図11参照、参考例としてc≧a (See FIG. 11, c ≧ a as a reference example
≧c/2かつd≧b≧d/2の場合を図12に示す。 The case of ≧ c / 2 and d ≧ b ≧ d / 2 shown in FIG. 12. ただし、c>a≧c/2かつd>b≧d/2の場合、凹部の位置は、巻き軸に垂直な方向については、直線部の中央とするのがもっとも好ましい。 However, c> For a ≧ c / 2 and d> b ≧ d / 2, the position of the recess, the direction perpendicular to the winding axis, most preferably to the central straight line portion. 巻き軸に平行な方向については、ケース底面から極板群上端とするのがもっとも好ましい。 The direction parallel to the winding axis, most preferably to the electrode plate group upper end of the case bottom. ) そして、電池ケース材質には、厚み0.5mmのアルミニウムを用いた。 ) Then, the battery case material, an aluminum having a thickness of 0.5 mm.

【0028】(ここでは、曲線部が半円弧状に形成されているが、扇弧状であってもよいし、これに限られるものではなくない。) 次に、作製した本発明電池を定電流2Aで4.1Vまで充電後、定電流2Aで2.75Vまで放電し放電容量を測定した。 [0028] (here, although curved portion is formed in a semicircular arc shape may be a fan arc, not rather than limited to this.) Next, the present invention battery fabricated constant current after charging with 2A to 4.1 V, to measure the discharge discharge capacity at a constant current 2A to 2.75 V. 試験温度は25℃とした。 The test temperature was 25 ° C.. 表1に放電容量と電池に挿入できた正極板長とをまとめた。 Table summarizing the discharge capacity and the positive electrode plate length was inserted into battery 1.

【0029】 [0029]

【表1】 [Table 1] 表1から明らかなように、直線部の凹部の曲率半径が8 Table 1 As is apparent from, the radius of curvature of the concave portion of the straight portion 8
0mm未満となると、放電容量が大きく低下した。 If less than 0 mm, the discharge capacity is decreased significantly. この原因は、曲率半径が80mm未満の場合、電池内の電極スペースが極端に圧縮されるため、電池に挿入できる電極長が短くなることに起因すると考えられる。 The reason has a radius of curvature of less than 80 mm, the electrode space in the battery is extremely compressed, is believed to be due to the electrode length that can be inserted into the battery is shortened.

【0030】次に、作製した本発明電池を定電流2Aで4.1Vまで充電後、定電流2Aで2.75Vまで放電する充放電サイクル試験を500サイクル行った。 Next, after charging to 4.1V of the present invention batteries fabricated at a constant current 2A, the charge-discharge cycle test for discharging at a constant current 2A to 2.75V it was performed 500 cycles. 試験温度は45℃とした。 The test temperature was 45 ° C..

【0031】図5、図6および図7にそれぞれ、充放電サイクルの進行にともなう放電容量、内部抵抗、電池厚みの変化をまとめた。 FIG. 5, respectively 6 and 7, the discharge capacity with the progress of charge-discharge cycles, the internal resistance, summarizes the changes in the battery thickness.

【0032】本発明電池B,C,Dは、サイクルの進行に伴う容量低下および内部抵抗の増大が小さく、電池厚みの変化も見られない。 [0032] The present invention cells B, C, D has a smaller increase in the capacity decrease and the internal resistance with the progress of the cycle, not also seen a change in battery thickness. しかしながら、Eおよび比較電池Fは、サイクルの進行に伴う容量低下および内部抵抗の増大に加えて、電池厚みの増大が大きいことがわかった。 However, E and comparative cells F, in addition to the increase in the capacity decrease and the internal resistance with the progress of the cycle, it was found that the increase in the battery thickness is large. 電池EおよびFで充放電サイクル寿命が短くなった原因は、下記の如く推定される。 Cause charge-discharge cycle life is shortened by the battery E and F are estimated as follows.

【0033】すなわち、充放電サイクルの進行にともないガスが発生し、内圧の上昇によって電池ケースが膨れる。 [0033] That is, the charge gas along with the progress of the discharge cycle occurs and swell the battery case by an increase in internal pressure. ケースが膨れることで、電極間距離が大きくなり電気化学反応が円滑におこなわれなくなるものと考えられる。 By case swell is believed that the distance between the electrodes is an electrochemical reaction is not smoothly performed significantly. 上記実施例から、角丸四角形状の直線部を曲率半径80mm〜250mmの凹部を形成した本発明電池は、 From the above examples, the present invention battery to a rounded square linear portion to form a recess radius of curvature 80Mm~250mm,
従来の長円形状電池と比較して同等の放電容量を有するとともに、充放電サイクル寿命性能が飛躍的に改善されることが明らかとなった。 Together with the equivalent discharge capacity as compared to conventional oval cell, charge-discharge cycle life performance was revealed to be dramatically improved.

【0034】次に、縦50mm,横130mm,高さ2 [0034] Next, vertical 50mm, horizontal 130mm, height 2
10mmの電池を作製し、本発明の効果を調べた。 To produce a battery of 10 mm, it was investigated the effect of the present invention.

【0035】正極リードおよび負極リードの本数をそれぞれ50本ずつとし、シート状正極に幅171mmのアルミニウム箔を、シート状負極に幅172mmの銅基箔を、セパレータに幅180mmのものを、電池ケース材質には厚み1.2mmのアルミニウムをいたことの他は、上記実施例と同様にして電池を組み立てた。 [0035] and the number of positive electrode lead and the negative electrode lead and one by 50 present, respectively, the aluminum foil width 171mm into a sheet positive electrode, a copper-based foil width 172mm into a sheet negative electrode, those width 180mm separator, battery case other be had aluminum thickness 1.2mm is made and assembled into a battery in the same manner as the above embodiment.

【0036】直線部をそれぞれ曲率半径50mm、80 The linear portion of each radius of curvature 50 mm, 80
mm、150mm、250mm、350mmで窪ました電池12をそれぞれG,H,I,J,Kとし、直線部に凹部を有しない電池12'をLとした。 mm, and 150 mm, 250 mm, G recess Mashi battery 12 respectively 350mm, H, I, J, and K, a battery 12 'having no recess in the straight portion and L.

【0037】次に、作製した本発明電池を定電流20A Next, the present invention battery fabricated constant current 20A
で4.1Vまで充電後、定電流20Aで2.75Vまで放電し放電容量を測定した。 After in charged to 4.1 V, to measure the discharge discharge capacity at a constant current of 20A up to 2.75 V. 試験温度は25℃とした。 The test temperature was 25 ° C..
表2に放電容量と電池に挿入できた正極板長とをまとめた。 Summarizing was inserted in the discharge capacity and the battery and the positive electrode plate length in Table 2.

【0038】 [0038]

【表2】 [Table 2] 表2から明らかなように、直線部の凹部の曲率半径が8 As apparent from Table 2, the radius of curvature of the concave portion of the straight portions 8
0mm未満となると、10Ahでの実施例と同様に放電容量が大きく低下することがわかった。 If less than 0 mm, it was found that similar discharge capacity and examples in 10Ah is greatly reduced. 次に、作製した電池を定電流20Aで4.1Vまで充電後、定電流20 Then, after charging to 4.1V The battery fabricated in a constant current 20A, constant current 20
Aで2.75Vまで放電する充放電サイクル試験を50 The charge-discharge cycle test for discharging at A to 2.75 V 50
0サイクル行った。 0 went cycle. 試験温度は45℃とした。 The test temperature was 45 ° C..

【0039】図8、図9および図10にそれぞれ、充放電サイクルの進行にともなう放電容量、内部抵抗、電池厚みの変化をまとめた。 FIG. 8, respectively 9 and 10, the discharge capacity with the progress of charge-discharge cycles, the internal resistance, summarizes the changes in the battery thickness. 本発明電池H,I,Jは、サイクルの進行に伴う容量低下および内部抵抗の増大が小さく、電池厚みの変化も見られない。 Present batteries H, I, J is a small increase in the capacity decrease and the internal resistance with the progress of the cycle, not also seen a change in battery thickness. しかし、Eおよび比較電池Fは、サイクルの進行に伴う容量低下および内部抵抗の増大に加え、電池厚みの増大が大きいことがわかった。 However, E and comparative cells F, in addition to the increase in capacity decrease and the internal resistance with the progress of the cycle, it was found that the increase in the battery thickness is large.

【0040】上記実施例から、本発明は電池の大きさに関わりなく電池特性の改善効果が得られることが明らかとなった。 [0040] From the above examples, the present invention has revealed that to obtain improvement of no battery characteristics regardless of the size of the battery.

【0041】本発明にかかる凹部は、半割ケースにプレス成形してもよいし、有底筒状のケースに後から形成してもよいし、ケース成型時に、たとえばインパクト成形法等によって同時に形成させてもよい。 Recess according to The present invention may be pressed into case half may be formed later into a bottomed cylindrical case, simultaneously formed during case molding, for example by impact molding method it may be. また、電池蓋はケースの形状に合わせたものを用いるのはいうまでもない。 The battery lid is of course to use those that match the shape of the case.

【0042】さらに、実施例では正極活物質としてLi [0042] Further, in the embodiment Li as cathode active material
CoO 2を用いる場合を説明したが、二硫化チタンをはじめとして二酸化マンガン、リチウムニッケル複合酸化物、リチウムニッケルコバルト複合酸化物、リチウムニッケルコバルトマンガン複合酸化物、リチウムコバルトアルミ複合酸化物、リチウムニッケルコバルトアルミ複合酸化物、リチウムニッケルコバルトマンガンアルミ複合酸化物、スピネル型リチウムマンガン酸化物、五酸化バナジウムおよび三酸化モリブデンなどの種々のものを用いることができる。 Having described the case of using CoO 2, manganese dioxide including the titanium disulfide, a lithium nickel composite oxide, lithium-nickel-cobalt composite oxide, lithium-nickel-cobalt-manganese composite oxide, lithium cobalt aluminum composite oxide, lithium-nickel-cobalt aluminum composite oxide, lithium-nickel-cobalt-manganese aluminum composite oxide, spinel-type lithium manganese oxide, can be used various ones, such as vanadium pentoxide and molybdenum trioxide. また、負極として黒鉛材料を用いたが、低結晶性の炭素材料や、アモルファスの炭素材料、酸化物等など種々のものを用いることができる。 Although used graphite material as the negative electrode, and low crystalline carbon material, the carbon material of amorphous, it is possible to use various materials such as oxides or the like.

【0043】さらに本発明は、電池内圧の上昇する種々の密閉型二次電池においても適用可能である。 [0043] The present invention is also applicable in a variety of enclosed type secondary battery to rise in battery internal pressure. 例えば、 For example,
鉛電池、ニッケルカドミウム電池およびニッケル水素電池などがあげられる。 Lead battery, nickel-cadmium batteries and nickel-hydrogen batteries and the like.

【0044】本願にかかる凹部は断面形状が円弧状に限ることはなく、台形の下底を除いた、、略台形状の斜辺を階段状にした形状であってもよいし、前記略台形状の上底を円弧とした複合形状であってもよく、これらに限られるものでもない。 The recesses according to the present is not that the cross-sectional shape limited to an arc shape may be a shape in which the hypotenuse of ,, substantially trapezoidal except trapezoidal lower base stepwise, the substantially trapezoidal It may be the upper base complex shape which is an arc, nor limited to these.

【0045】 [0045]

【発明の効果】本発明になる二次電池は、巻回してなる電極体が収納される電池ケースを備えてなり、対向する電池ケース側壁には、電極体巻軸に対して平行な凹部が設けられており、前記凹部は、横幅をa及び縦幅をbとし、かつ前記凹部の設けられた側壁の横幅をc及び縦幅をdとすると、c≧a≧c/2かつd≧b≧d/2なる関係を満足してなることを特徴とする。 Secondary battery comprising a [Effect the Invention The present invention is made comprises a battery case electrode body formed by winding is housed, the battery case opposed side walls, parallel recesses with respect to the electrode body winding shaft provided, said recess, when the width a and the vertical width and is b, and the width of the side wall provided with the said recess to the c and the vertical width and d, c ≧ a ≧ c / 2 and d ≧ b characterized by comprising satisfied ≧ d / 2 the relationship.

【0046】第1の発明にかかる第2の発明は、前記凹部は、電極体巻軸に対して垂直となる断面形状が曲率半径80mm〜250mmの円弧状であることを特徴とする。 The second invention according to the first invention, the concave portion, and wherein the cross-sectional shape which is perpendicular to the electrode body winding shaft is arcuate curvature 80Mm~250mm.

【0047】第1又は第2の発明にかかる二次電池において、電極体巻軸と垂直となる断面形状が角丸四角形状の電池ケースを備えてなり、断面形状が直線状の電池ケース側壁には、前記凹部が形成されてなることを特徴とする。 [0047] In the secondary battery according to the first or second aspect of the invention, will cross section comprising an electrode body winding shaft and vertically includes a rounded rectangular battery case, the cross-sectional shape is a linear battery case side wall It is characterized in that the recess is formed.

【0048】第1、2又は3にかかる第4の発明は、該負極がリチウムイオンを吸蔵、放出可能なリチウムホスト物質を備えてなる有機電解質二次電池であることを特徴とする。 [0048] A fourth invention according to the 1, 2 or 3, characterized in that negative electrode is an organic electrolyte secondary battery comprising comprising absorb lithium ions, the releasable lithium host material.

【0049】これによれば、電池の膨れを効果的に抑制し、充放電サイクル寿命性能およびスペース効率に優れた電池を提供することができる。 [0049] According to this, it is possible to effectively suppress the expansion of the battery, provides a battery having excellent charge-discharge cycle life performance and space efficiency. また、負極にリチウムを吸蔵放出する材料を、正極に金属酸化物あるいは金属硫化物を用いた電池系に適用することで、高容量のリチウム二次電解質電池を得ることができるものでもあり、 Further, a material that stores and releases lithium in the negative electrode, by applying to the battery system to a positive electrode using a metal oxide or a metal sulfide, also those can be obtained lithium secondary electrolyte battery with high capacity Yes,
その工業的価値は極めて大である。 Its industrial value is extremely large.

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

【図1】円筒形に巻き回した電極群 [1] electrode group wound in a cylindrical shape

【図2】角丸四角形状に加工した電極群 [Figure 2] processed electrode group rounded square shape

【図3】従来電池の外観図 FIG. 3 is an external view of a conventional battery

【図4】電池ケースの横断面形状 Figure 4 is a cross-sectional shape of the battery case

【図5】試験電池の充放電サイクルの進行にともなう放電容量の変化を示す図である。 5 is a diagram showing the change in discharge capacity with the progress of charge-discharge cycle of the test battery.

【図6】試験電池の充放電サイクルの進行にともなう内部抵抗の変化を示す図である。 6 is a graph showing changes in the internal resistance due to the progress of the charge-discharge cycle of the test battery.

【図7】試験電池の充放電サイクルの進行にともなう電池厚みの変化を示す図である。 7 is a graph showing changes in battery thickness caused by the progress of charge-discharge cycle of the test battery.

【図8】試験電池の充放電サイクルの進行にともなう放電容量の変化を示す図である。 8 is a graph showing changes in discharge capacity with the progress of charge-discharge cycle of the test battery.

【図9】試験電池の充放電サイクルの進行にともなう内部抵抗の変化を示す図である。 9 is a graph showing changes in the internal resistance due to the progress of the charge-discharge cycle of the test battery.

【図10】試験電池の充放電サイクルの進行にともなう電池厚みの変化を示す図である。 10 is a diagram showing changes in battery thickness caused by the progress of charge-discharge cycle of the test battery.

【図11】本発明になる二次電池の一実施例を示す図である。 11 is a diagram showing an embodiment of a secondary battery according to the present invention.

【図12】本発明になる二次電池の他の実施例を示す図である。 12 is a diagram showing another embodiment of a secondary battery according to the present invention.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 正極 2 セパレーター 3 負極 4 正極リード 5 負極リード 6 アルミニウム製パイプ 7 テープ 8 従来の電池容器(横断面角丸四角形状) 8'電池容器(本発明になる) 9 正極端子 10 負極端子 11 安全弁 12 本発明になる電池 1 positive electrode 2 Separator 3 negative electrode 4 positive electrode lead 5 negative electrode lead 6 made of aluminum pipe 7 tape 8 (to the present invention) Conventional battery container (cross section Rounded square shape) 8 'battery container 9 positive terminal 10 negative electrode terminal 11 a safety valve 12 the battery according to the present invention

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 巻回してなる電極体が収納される電池ケースを備えてなる二次電池において、 対向する電池ケース側壁には、電極体巻軸に対して平行な凹部が設けられており、 前記凹部は、横幅をa及び縦幅をbとし、かつ前記凹部の設けられた側壁の横幅をc及び縦幅をdとすると、 c≧a≧c/2かつd≧b≧d/2 なる関係を満足してなることを特徴とする二次電池。 1. A winding turn and becomes the electrode body secondary battery comprising comprising a battery case to be accommodated, the battery case opposed side walls, is provided with parallel recesses with respect to the electrode body winding shaft, the recess, the lateral width a and the vertical width is b, and when the width of the side wall provided with the said recess to c and the longitudinal width is d, becomes c ≧ a ≧ c / 2 and d ≧ b ≧ d / 2 secondary battery characterized by comprising satisfy the relationship.
  2. 【請求項2】 前記凹部は、電極体巻軸に対して垂直となる断面形状が曲率半径80mm〜250mmの円弧状であることを特徴とする請求項1記載の二次電池。 Wherein said recess is a secondary battery according to claim 1, wherein the cross-sectional shape which is perpendicular to the electrode body winding shaft is characterized in that an arc-shaped curvature 80Mm~250mm.
  3. 【請求項3】 電極体巻軸と垂直となる断面形状が角丸四角形状の電池ケースを備えてなる二次電池において、 断面形状が直線状の電池ケース側壁には、前記凹部が形成されてなることを特徴とする請求項1又は2記載の二次電池。 Wherein the electrode body winding axis perpendicular sectional shape in a secondary cell comprising comprises a rounded rectangular battery case, the battery case side wall straight cross-sectional shape, the recess is formed the secondary battery according to claim 1 or 2, wherein the composed.
  4. 【請求項4】 該負極がリチウムイオンを吸蔵、放出可能なリチウムホスト物質を備えてなる有機電解質二次電池であることを特徴とする請求項1、2又は3記載の二次電池。 4. A negative electrode absorbs lithium ion secondary battery according to claim 1, 2 or 3, wherein the organic electrolyte secondary cell comprising comprises a lithium host material capable of releasing.
JP1469697A 1997-01-10 1997-01-10 Secondary battery Pending JPH10199493A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1469697A JPH10199493A (en) 1997-01-10 1997-01-10 Secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1469697A JPH10199493A (en) 1997-01-10 1997-01-10 Secondary battery

Publications (1)

Publication Number Publication Date
JPH10199493A true JPH10199493A (en) 1998-07-31

Family

ID=11868362

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1469697A Pending JPH10199493A (en) 1997-01-10 1997-01-10 Secondary battery

Country Status (1)

Country Link
JP (1) JPH10199493A (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0910129A1 (en) * 1997-10-14 1999-04-21 Ngk Insulators, Ltd. Lithium secondary battery
WO2000035031A2 (en) * 1998-12-11 2000-06-15 Eveready Battery Company, Inc. Electrochemical cell with container wall formed against deformation
WO2002043178A1 (en) * 2000-11-21 2002-05-30 Sony Corporation Polymer electrolyte battery and method of producing same
EP1278252A3 (en) * 2001-07-19 2003-02-12 Wilson Greatbatch Technologies, Inc. Contoured casing for an electrical cell
US6610443B2 (en) 2001-03-19 2003-08-26 Wilson Greatbatch Ltd. One-piece header assembly for hermetic battery terminal feedthrough, fill and closure designs
US6613474B2 (en) 2000-04-06 2003-09-02 Wilson Greatbatch Ltd. Electrochemical cell having a casing of mating portions
JP2005538498A (en) * 2001-12-14 2005-12-15 ザ ジレット カンパニー The electrolyte additive for non-aqueous electrochemical cell
JP2006040879A (en) * 2004-07-29 2006-02-09 Samsung Sdi Co Ltd Lithium-ion secondary battery, case for lithium-ion secondary battery, and manufacturing method of lithium-ion secondary battery
KR100601510B1 (en) 2004-09-22 2006-07-19 삼성에스디아이 주식회사 Pouch Type Li Secondary Battery and Method of fabricating the same
US7103415B2 (en) 2001-07-19 2006-09-05 Wilson Greatbatch Technologies, Inc. Contoured housing for an implantable medical device
JP2008091252A (en) * 2006-10-03 2008-04-17 Gs Yuasa Corporation:Kk Battery and its manufacturing method
EP2309571A1 (en) * 2009-09-29 2011-04-13 Samsung SDI Co., Ltd. Secondary battery
KR101308268B1 (en) * 2007-05-17 2013-09-13 삼성에스디아이 주식회사 Secondary battery
CN104412409A (en) * 2012-06-27 2015-03-11 夏普株式会社 Secondary cell
JP2015109170A (en) * 2013-12-04 2015-06-11 三菱自動車工業株式会社 Battery
WO2018029816A1 (en) * 2016-08-10 2018-02-15 日立化成株式会社 Case for assembled battery, storage battery, assembled battery, and storage battery system

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6841297B2 (en) 1997-10-14 2005-01-11 Ngk Insulators, Ltd. Lithium secondary battery
EP0910129A1 (en) * 1997-10-14 1999-04-21 Ngk Insulators, Ltd. Lithium secondary battery
US6352793B2 (en) 1997-10-14 2002-03-05 Ngk Insulators, Ltd. Lithium secondary battery
WO2000035031A3 (en) * 1998-12-11 2000-10-19 Eveready Battery Inc Electrochemical cell with container wall formed against deformation
US6248472B1 (en) 1998-12-11 2001-06-19 Eveready Battery Company, Inc. Electrochemical cell formed with can having walls extending radially inward
WO2000035031A2 (en) * 1998-12-11 2000-06-15 Eveready Battery Company, Inc. Electrochemical cell with container wall formed against deformation
US6677079B2 (en) 1998-12-11 2004-01-13 Eveready Battery Company, Inc. Electrochemical cell formed with can having inwardly curved groove
US6613474B2 (en) 2000-04-06 2003-09-02 Wilson Greatbatch Ltd. Electrochemical cell having a casing of mating portions
WO2002043178A1 (en) * 2000-11-21 2002-05-30 Sony Corporation Polymer electrolyte battery and method of producing same
US7163762B2 (en) * 2000-11-21 2007-01-16 Sony Corporation Polymer electrolyte battery and method of producing same
US7704633B2 (en) 2000-11-21 2010-04-27 Sony Corporation Polymer electrolyte battery
US7128765B2 (en) 2001-03-19 2006-10-31 Wilson Greatbatch Technologies, Inc. Method for providing a one-piece header assembly for hermetic battery terminal feedthrough, fill and closure designs
US6610443B2 (en) 2001-03-19 2003-08-26 Wilson Greatbatch Ltd. One-piece header assembly for hermetic battery terminal feedthrough, fill and closure designs
US6977124B2 (en) 2001-07-19 2005-12-20 Wilson Greatbatch Technologies, Inc. Contoured casing for an electrochemical cell
US7074520B2 (en) 2001-07-19 2006-07-11 Wilson Greatbatch Technologies, Inc. Contoured casing of mating clamshell portions for an electrochemical cell
US7103415B2 (en) 2001-07-19 2006-09-05 Wilson Greatbatch Technologies, Inc. Contoured housing for an implantable medical device
EP1278252A3 (en) * 2001-07-19 2003-02-12 Wilson Greatbatch Technologies, Inc. Contoured casing for an electrical cell
JP2005538498A (en) * 2001-12-14 2005-12-15 ザ ジレット カンパニー The electrolyte additive for non-aqueous electrochemical cell
JP2006040879A (en) * 2004-07-29 2006-02-09 Samsung Sdi Co Ltd Lithium-ion secondary battery, case for lithium-ion secondary battery, and manufacturing method of lithium-ion secondary battery
JP4633528B2 (en) * 2004-07-29 2011-02-23 三星エスディアイ株式会社 Method for producing a lithium ion secondary battery and a lithium ion secondary battery
KR100601510B1 (en) 2004-09-22 2006-07-19 삼성에스디아이 주식회사 Pouch Type Li Secondary Battery and Method of fabricating the same
JP2008091252A (en) * 2006-10-03 2008-04-17 Gs Yuasa Corporation:Kk Battery and its manufacturing method
KR101308268B1 (en) * 2007-05-17 2013-09-13 삼성에스디아이 주식회사 Secondary battery
EP2309571A1 (en) * 2009-09-29 2011-04-13 Samsung SDI Co., Ltd. Secondary battery
JP2011077019A (en) * 2009-09-29 2011-04-14 Samsung Sdi Co Ltd Secondary battery
CN102035011A (en) * 2009-09-29 2011-04-27 三星Sdi株式会社 Secondary battery
US9214698B2 (en) 2009-09-29 2015-12-15 Samsung Sdi Co., Ltd. Secondary battery including a fixing part on the inside of the can with a defined distance between the fixing part and the electrode assembly
CN104412409A (en) * 2012-06-27 2015-03-11 夏普株式会社 Secondary cell
JP2015109170A (en) * 2013-12-04 2015-06-11 三菱自動車工業株式会社 Battery
WO2018029816A1 (en) * 2016-08-10 2018-02-15 日立化成株式会社 Case for assembled battery, storage battery, assembled battery, and storage battery system
WO2018030471A1 (en) * 2016-08-10 2018-02-15 日立化成株式会社 Case for assembled batteries, lead storage battery, assembled battery, storage battery system, method for improving heat dissipation properties of case for assembled batteries, and method for improving deformation resistance of case for assembled batteries

Similar Documents

Publication Publication Date Title
JP4866496B2 (en) Method of manufacturing a secondary battery
JP4366101B2 (en) Lithium secondary battery
US6740446B2 (en) Electrochemical cell with zigzag electrodes
JP3397351B2 (en) Square or a sheet-type battery and a method of manufacturing the same
CN1123944C (en) Prodn. method of nonaqueous electrolyte secondary battery
CA2694247C (en) Battery
JP4633528B2 (en) Method for producing a lithium ion secondary battery and a lithium ion secondary battery
CN101517776B (en) Pouch-type secondary battery having an non-sealing residue portion
JP3005493B2 (en) Method of manufacturing a prismatic battery
US4956247A (en) Nonaqueous electrolyte secondary cell
JP2001143702A (en) Non-aqueous secondary battery
JP4362789B2 (en) battery
JP2000200605A (en) Nonaqueous electrolyte battery and its manufacture
JP3997370B2 (en) Non-aqueous secondary battery
JP3885327B2 (en) Flat angle-type non-aqueous electrolyte secondary battery
JP3536391B2 (en) Method for producing a wound electrode element body and a battery using the manufacturing method and wound electrode element thereof
CN101276942A (en) Nonaqueous electrolyte battery, battery pack and vehicle
WO2007097172A1 (en) Method of manufacturing square flat secondary battery
CN1227763C (en) Solid electrolytic battery
JP3427216B2 (en) Prismatic battery
JP2001057179A (en) Secondary battery and case thereof
EP2315300B1 (en) Solid electrolyte cell
CN1258236C (en) Coiled electrode sets for battery and battery pack
JP3822445B2 (en) The electrochemical device
JPH10208730A (en) Non-aqueous electrolyte secondary battery