JPH0574496A - Secondary battery - Google Patents
Secondary batteryInfo
- Publication number
- JPH0574496A JPH0574496A JP3233166A JP23316691A JPH0574496A JP H0574496 A JPH0574496 A JP H0574496A JP 3233166 A JP3233166 A JP 3233166A JP 23316691 A JP23316691 A JP 23316691A JP H0574496 A JPH0574496 A JP H0574496A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- active material
- negative electrode
- positive
- separator
- 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
Links
- 239000011888 foil Substances 0.000 claims abstract description 25
- 239000011149 active material Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 238000004804 winding Methods 0.000 abstract description 23
- 239000007774 positive electrode material Substances 0.000 abstract description 13
- 239000006185 dispersion Substances 0.000 abstract 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052744 lithium Inorganic materials 0.000 description 9
- 230000014759 maintenance of location Effects 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011889 copper foil Substances 0.000 description 5
- 238000002788 crimping Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000007773 negative electrode material Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、二次電池、特に非水系
二次電池の繰り返し使用による電池容量の低下防止、及
び自己放電の抑制に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to prevention of reduction in battery capacity due to repeated use of secondary batteries, especially non-aqueous secondary batteries, and suppression of self-discharge.
【０００２】[0002]
【従来の技術】一般に、電池は正、負の電極をセパレー
タを介して向き合わせて成る。電池の出力特性は、正、
負の電極が向かい合う面積に比例し、大電流を取り出す
ためには、この面積が大きいことが必要となる。特に、
非水系電池の場合には、電解液の電導度が低いため、よ
り大きい面積を必要とする。2. Description of the Related Art Generally, a battery has positive and negative electrodes facing each other via a separator. The output characteristics of the battery are positive,
This area is large in order to take out a large current in proportion to the area where the negative electrodes face each other. In particular,
In the case of a non-aqueous battery, since the electric conductivity of the electrolytic solution is low, a larger area is required.
【０００３】通常、大面積を得るためには、正、負の電
極をセパレータを介してロール状に巻き込んだ形状が一
般的であり、その中でも、薄い金属箔を集電体とし、こ
れに活物質を付着せしめてなる極薄い電極が有効であ
る。例えば、特開昭６０−２５３１５７には、厚さ１〜
１００μｍのアルミニウム箔を用いた、高出力、高エネ
ルギー密度の非水系二次電池が開示されている。Generally, in order to obtain a large area, a positive electrode and a negative electrode are generally wound in a roll shape with a separator interposed therebetween. Among them, a thin metal foil is used as a current collector and is used as a collector. An extremely thin electrode made by adhering a substance is effective. For example, in JP-A-60-253157, a thickness of 1 to
A high-power, high-energy-density non-aqueous secondary battery using a 100 μm aluminum foil is disclosed.
【０００４】[0004]
【発明が解決しようとする課題】正、負の電極をセパレ
ータを介して巻き込む場合、正、負極の重ね合わせに寸
法的余裕がないと、電極厚みの変動、巻取り装置の測長
精度等により、巻始め及び巻終わりで正極活物質面に対
向する負極活物質面が存在しない部分が生じてしまう。
かかる構造の電池においては、正極より脱ドープされた
リチウムイオンは、対向する位置に負極活物質が存在し
ないため、負極の金属箔断面、もしくは缶の内壁に金属
リチウムとして析出する。一旦析出した金属リチウムは
放電の際、負極と電子の授受を行うことのできるわずか
な部分だけがリチウムイオンに戻り、再び充放電に寄与
するようになるが、やがて負極との接触もなくなり、大
部分が金属リチウムのまま電解液中に浮遊することにな
る。このことは金属リチウムの析出が電池容量を低下さ
せる原因となるばかりか、ミクロ短絡の原因とも成りか
ねないことを示している。結果として、繰り返し使用に
よる電池容量の低下、自己放電率の増大が顕著となり、
エネルギー密度が小さくなってしまう。When positive and negative electrodes are wound via a separator, if there is no dimensional margin for superimposing the positive and negative electrodes, fluctuations in the electrode thickness, length measurement accuracy of the winding device, etc. In some cases, the negative electrode active material surface facing the positive electrode active material surface does not exist at the beginning and end of winding.
In the battery having such a structure, the lithium ions dedoped from the positive electrode are deposited as metallic lithium on the metal foil cross section of the negative electrode or the inner wall of the can because the negative electrode active material does not exist at the opposing position. During discharge, the deposited metal lithium returns to lithium ions only in a small portion where electrons can be transferred between the negative electrode and lithium ions, and contributes to charging and discharging again. The portion of the metallic lithium remains floating in the electrolytic solution. This indicates that the deposition of metallic lithium not only causes a decrease in battery capacity, but may also cause a micro short circuit. As a result, the decrease in battery capacity due to repeated use and the increase in self-discharge rate become remarkable,
Energy density becomes small.
【０００５】また、円筒状に巻き込んで成る捲回体を押
しつぶして偏平化した場合には、特に最内周部に正極活
物質面が露出すると、そこで発生した金属リチウムによ
りミクロ短絡が生じ易くなる。更に、正極活物質面に、
対向する負極活物質面が存在しない部分を有する捲回体
よりなる電池が、万一充電器の故障等により過充電状態
になった場合、負極の端部にはおびただしい量の金属リ
チウムが析出する。このため、電池容量は著しく低下
し、短絡の程度も大きくなる。Further, when the wound body formed into a cylindrical shape is crushed and flattened, particularly when the surface of the positive electrode active material is exposed at the innermost peripheral portion, a micro-short circuit easily occurs due to metallic lithium generated there. .. Furthermore, on the positive electrode active material surface,
If a battery composed of a wound body having a portion where the opposite negative electrode active material surface does not exist becomes overcharged due to a failure of the charger or the like, a large amount of metallic lithium is deposited at the end of the negative electrode. .. Therefore, the battery capacity is significantly reduced and the degree of short circuit is increased.
【０００６】[0006]
【課題を解決するための手段】本発明は、金属箔に活物
質を添着せしめてなる正、負の電極を、全電極長にわた
りセパレータを介してロール状に巻き込んで成る電池に
おいて、電極厚みの変動、巻取り装置の測長誤差等によ
る電極長ばらつきが発生しても、電極の最内周及び最外
周ともに負極で占めるように巻き込み、更に最内周電極
の内側にセパレータを１層以上巻き込むことで、繰り返
し使用の容量低下、及び自己放電が小さい電池を提供す
ることを目的とする。SUMMARY OF THE INVENTION The present invention provides a battery in which positive and negative electrodes made by attaching an active material to a metal foil are wound in a roll shape through a separator over the entire length of the electrode. Even if the electrode length fluctuates due to fluctuations or length measurement error of the winding device, the electrode is wound so that the innermost and outermost circumferences of the electrode are occupied by the negative electrode, and one or more layers of separators are further wound inside the innermost electrode. Thus, it is an object of the present invention to provide a battery that has a reduced capacity of repeated use and a small self-discharge.
【０００７】即ち、本発明は、正極及び負極の活物質を
それぞれ金属箔集電体に添着せしめてなる電極を全電極
長にわたりセパレータを介して対向配置して巻き込んで
成る電池構造において、該負極が電極の最内周及び最外
周を共に占めることを特徴とする二次電池である。本発
明では、捲回体の電極巻始め部、巻終わり部共に正極活
物質面をセパレータを介して、負極で完全に覆ってしま
い、正極活物質が露出しないようにすることがポイント
である。このときに使用する負極は、金属箔集電体の片
面のみに活物質を添着せしめた物の金属箔側を合わせて
重ねて成るものを用いてもよいし、金属箔の両面に均一
に活物質を添着せしめた物を用いても構わない。正極に
おいても同様である。That is, the present invention provides a battery structure in which electrodes formed by adhering the active materials of the positive electrode and the negative electrode to a metal foil current collector are wound so as to face each other across the entire electrode length with a separator interposed therebetween. Occupies both the innermost circumference and the outermost circumference of the electrode. In the present invention, the point is to prevent the positive electrode active material from being exposed because the positive electrode active material surface is completely covered with the negative electrode at both the electrode winding start portion and the winding end portion of the wound body through the separator. The negative electrode used at this time may be one in which the active material is attached to only one side of the metal foil current collector and the metal foil side is laminated together, or the negative electrode used may be uniformly applied to both sides of the metal foil. You may use the thing which made the substance adhere. The same applies to the positive electrode.
【０００８】正極活物質面をセパレータを介して負極で
完全に覆う場合、正極からみて負極の余分な長さは、詰
め込み量を考えると短い方がよいが、短すぎる設計をす
ると各電極の厚みのばらつき、巻取り装置の電極測長精
度などの要因により、正極活物質が露出する捲回体がで
きてしまう恐れがある。従って、巻出し部分及び巻終わ
り部分において正極がセパレータを介して完全に負極に
よって覆われ、且つ、前記部位において、セパレータを
介して対向する正、負極の各端部間の距離は捲回体の状
態で、１〜１０ｍｍとするのが好ましい。更に好ましく
は、２〜５ｍｍとするのが良い。When the surface of the positive electrode active material is completely covered with the negative electrode via the separator, the extra length of the negative electrode as viewed from the positive electrode is preferably short considering the packing amount, but if it is designed too short, the thickness of each electrode will be large. There is a possibility that a wound body in which the positive electrode active material is exposed may be formed due to factors such as the variation in temperature, the electrode length measurement accuracy of the winding device, and the like. Therefore, the positive electrode is completely covered by the negative electrode through the separator at the unwinding portion and the winding end portion, and the distance between the positive and negative electrode ends facing each other through the separator is the same as that of the wound body. In the state, it is preferably 1 to 10 mm. More preferably, it should be 2 to 5 mm.
【０００９】[0009]
【作用】本発明により、金属箔に活物質を添着せしめて
なる正、負の電極をセパレータを介してロール状に巻き
込んで成る電池において、析出する金属リチウムの量を
著しく減少させることができるので、繰り返し使用によ
る電池容量の低下、自己放電、及び過充電による劣化を
抑えることが可能となる。According to the present invention, in a battery in which positive and negative electrodes made by attaching an active material to a metal foil are wound in a roll shape via a separator, the amount of metallic lithium deposited can be significantly reduced. It is possible to suppress a decrease in battery capacity due to repeated use, self-discharge, and deterioration due to overcharge.
【００１０】[0010]
【実施例】次に、実施例を挙げて本発明を説明する。
尚、以下の記載において、正極活物質ＬｉＣｏＯ2 は市
販試薬ＣｏＯとＬｉ2ＣＯ3を９００℃で１００ｈｒ熱処
理することによって得た物である。正極は活物質ＬｉＣ
ｏＯ2に対して５％の炭素系導電フィラーを加えて成る
コンパウンドに、ポリビニリデンフルオライドの５％Ｄ
ＭＦ溶液を等量加えて懸濁液とし、これをアルミニウム
箔の片面あるいは両面に均一に塗布して作成する。塗布
量は片面当り２７０ｇ／ｍ2である。EXAMPLES Next, the present invention will be described with reference to examples.
In the following description, the positive electrode active material LiCoO 2 is a product obtained by heat-treating commercially available reagents CoO and Li 2 CO 3 at 900 ° C. for 100 hours. The positive electrode is the active material LiC
5% D of polyvinylidene fluoride was added to the compound consisting of 5% carbon-based conductive filler to oO 2 .
An equal amount of MF solution is added to form a suspension, which is evenly applied to one side or both sides of an aluminum foil. The coating amount is 270 g / m 2 per side.
【００１１】負極は活物質として、真比重２．３の炭素
質材料を平均粒径１０μｍ前後に粉砕した物に、ポリビ
ニリデンフルオライドの５％ＤＭＦ溶液を等量加えて懸
濁液とし、これをニッケル箔あるいは銅箔の片面あるい
は両面に均一に塗布して作成する。塗布量は片面当り１
３５ｇ／ｍ2である。セパレータは３５μｍのポリエチ
レン微多孔膜を用いる。As the negative electrode, as an active material, a carbonaceous material having a true specific gravity of 2.3 was ground to an average particle size of about 10 μm, and an equal amount of a 5% solution of polyvinylidene fluoride in DMF was added to obtain a suspension. Is uniformly applied to one side or both sides of nickel foil or copper foil. Coating amount is 1 per side
It is 35 g / m 2 . A 35 μm polyethylene microporous membrane is used as the separator.
【００１２】正、負極をセパレータを介してロール状に
巻取り、所定のサイズの缶にいれた後、ＬｉＣｌＯ4−
１．０ｍｏｌ／ｌのプロピレンカーボネート溶液を含浸
する。 放電容量は４．２Ｖまで充電した後、２．７Ｖ
まで放電して評価する。The positive and negative electrodes were wound into a roll through a separator, put in a can of a predetermined size, and then LiClO 4
Impregnate with a 1.0 mol / l propylene carbonate solution. Discharge capacity is 2.7V after charging to 4.2V
Discharge and evaluate.
【００１３】[0013]
【実施例１】正極には厚さ１５μｍ、幅４５ｍｍのアル
ミニウム箔の片面にのみ活物質を添着せしめた物を、負
極には厚さ１０μｍ、幅４５ｍｍの銅箔の両面に活物質
を添着せしめた物をそれぞれ用い、セパレータを介して
内径１４ｍｍの円筒缶にはいるだけ巻き込む。すなわ
ち、捲回体は電極最内周と電極最外周を負極が占め、正
極は負極によって完全に覆い隠された状態になってい
る。つまり図１のごとく、電極巻き始め部では、正極端
部は負極端部よりも３ｍｍほど後方に位置し、電極巻終
わり部では、正極端は負極端より７ｍｍ前方に位置す
る。電流取り出し用タブは正極は超音波溶接法で取り付
け、負極は電極と重ね併せて、タブ材の上からキリで穴
を開け、プレスしてカシメる方法（グサリカシメ法）で
取り付ける。Example 1 A positive electrode was formed by attaching an active material to one side of an aluminum foil having a thickness of 15 μm and a width of 45 mm, and a negative electrode was formed by attaching an active material to both sides of a copper foil having a thickness of 10 μm and a width of 45 mm. Each of the above items is used, and it is rolled up by inserting it into a cylindrical can having an inner diameter of 14 mm through a separator. That is, in the wound body, the negative electrode occupies the innermost circumference and the outermost circumference of the electrode, and the positive electrode is completely covered by the negative electrode. That is, as shown in FIG. 1, the positive electrode end portion is located about 3 mm behind the negative electrode end portion at the electrode winding start portion, and the positive electrode end portion is located 7 mm ahead of the negative electrode end at the electrode winding end portion. The positive electrode of the current extraction tab is attached by the ultrasonic welding method, the negative electrode is attached to the electrode by superposing it on the electrode material, punching a hole from the top of the tab material, and crimping by pressing (the crimping method).
【００１４】また、最初、セパレータのみを巻くので、
図１のように、負極の内側にセパレータが２層存在して
いる。繰り返し使用による容量保持率を図５に、２５℃
雰囲気中での自己放電率を表１に示す。Further, since only the separator is wound at first,
As shown in FIG. 1, two layers of separators are present inside the negative electrode. Figure 5 shows the capacity retention rate after repeated use at 25 ° C.
Table 1 shows the self-discharge rate in the atmosphere.
【００１５】[0015]
【実施例２】正極には厚さ１５μｍ、幅６５ｍｍのアル
ミニウム箔の片面にのみ活物質を添着せしめた物を、負
極には厚さ１０μｍ、幅６５ｍｍのニッケル箔の同じく
片面にのみ活物質を添着せしめた物をそれぞれ用い、セ
パレータを介して巻き込み、偏平につぶして、内寸５．
２×２３．２ｍｍの角形缶に詰め込む。すなわち、図２
のように電極巻き始め部では対向する正、負極の組が２
組存在し、そのいずれもが正極端部が負極端部よりも３
ｍｍ後方に位置して、正極は完全に負極によって包み込
まれ、電極巻き終わり部は同図のような構造になる。電
流の取り出しは、正極は電極と重ね併せて、タブ材の上
からキリで穴を開け、プレスしてカシメる方法（グサリ
カシメ法）で取り付けたタブにより、負極は最外周の金
属箔面と缶の内壁の接触により行う。Example 2 A positive electrode was formed by attaching an active material to only one side of an aluminum foil having a thickness of 15 μm and a width of 65 mm, and a negative electrode was formed by applying an active material only to one side of a nickel foil having a thickness of 10 μm and a width of 65 mm. Each of the attached materials is rolled up through a separator, flattened, and the inside dimension is 5.
Pack in a 2 x 23.2 mm square can. That is, FIG.
There are 2 pairs of positive and negative electrodes facing each other at the beginning of electrode winding.
There are 3 pairs, and the positive electrode end is 3 more than the negative electrode end.
Located at the rear of mm, the positive electrode is completely wrapped by the negative electrode, and the electrode winding end portion has a structure as shown in the figure. To extract the current, the positive electrode is stacked with the electrode, a hole is punched from the top of the tab material, and the tab is attached by pressing (crimping) method.The negative electrode is attached to the outermost metal foil surface and the can. The contact is made with the inner wall of
【００１６】繰り返し使用による容量保持率を図５に、
２５℃雰囲気中での自己放電率を表１に示す。FIG. 5 shows the capacity retention rate after repeated use.
Table 1 shows the self-discharge rate in an atmosphere of 25 ° C.
【００１７】[0017]
【比較例１】正極には厚さ１５μｍ、幅６５ｍｍのアル
ミニウム箔の両面に活物質を添着せしめた物を、負極に
は厚さ１０μｍ、幅６５ｍｍの銅箔の片面にのみ活物質
を添着せしめた物をそれぞれ用い、セパレータを介して
巻き込み、偏平につぶして、内寸５．２×２３．２ｍｍ
の角形缶に詰め込む。すなわち、図３のように電極最内
周の半分を正極が占め、残りの半分を負極が占めるよう
な捲回体を最内周において同種の電極同士が向き合わな
いように偏平化する。このような捲回体構造とする場
合、負極の端部は正極活物質面によって完全に包み込ま
れてしまう。電極巻き終わり部は同図のようになる。電
流の取り出しは、正極はグサリカシメ法で取り付けたタ
ブにより、負極は最外周の金属箔面と缶内壁との接触に
より行う。Comparative Example 1 A positive electrode was made by attaching an active material to both sides of an aluminum foil having a thickness of 15 μm and a width of 65 mm, and a negative electrode was made to attach only one side of a copper foil having a thickness of 10 μm and a width of 65 mm. Using each of the above items, wrap it up through the separator, crush it flatly, and get an internal size of 5.2 x 23.2 mm.
Pack it in a square can. That is, as shown in FIG. 3, the positive electrode occupies the innermost half of the electrode and the remaining negative electrode occupies the negative electrode, and the wound body is flattened so that electrodes of the same kind do not face each other at the innermost circumference. In the case of such a wound body structure, the end portion of the negative electrode is completely wrapped by the positive electrode active material surface. The end of electrode winding is as shown in the figure. The current is taken out by the tab attached to the positive electrode by the crimping method, and the negative electrode is brought into contact with the outermost metal foil surface and the inner wall of the can.
【００１８】繰り返し使用による容量保持率を図５に、
２５℃雰囲気中での自己放電率を表１に示す。図５に示
すように、２００回程度の繰り返し使用で、金属リチウ
ム析出による内部短絡が原因の容量低下が見られる。電
池を解体したところ、捲回体最内周において、正極活物
質面に覆われた負極の端部におびただしい量の金属リチ
ウムの析出を認めている。FIG. 5 shows the capacity retention rate by repeated use.
Table 1 shows the self-discharge rate in an atmosphere of 25 ° C. As shown in FIG. 5, after repeated use about 200 times, a decrease in capacity due to an internal short circuit due to metal lithium deposition is observed. When the battery was disassembled, a large amount of metallic lithium was found to be deposited at the end of the negative electrode covered with the surface of the positive electrode active material at the innermost circumference of the wound body.
【００１９】[0019]
【比較例２】正極には厚さ１５μｍ、幅６５ｍｍのアル
ミニウム箔の片面のみに活物質を添着したものを、負極
には厚さ１０μｍ、幅６５ｍｍの銅箔の両面に活物質を
添着したものをそれぞれ用い、セパレータを介して巻き
込み、偏平につぶして、内寸５．２×２３．２ｍｍの深
絞り長円缶に詰め込む。すなわち、図４のように最内周
はアルミニウム箔面同士がセパレータを介して向き合
い、最外周においては、アルミニウム箔面がテープで保
護された負極の一部を除き、ほぼ全面に露出して、缶内
壁と接触する。負極のタブはグサリカシメ法で取り付け
る。Comparative Example 2 A positive electrode having an active material attached to only one side of an aluminum foil having a thickness of 15 μm and a width of 65 mm, and a negative electrode having an active material attached to both sides of a copper foil having a thickness of 10 μm and a width of 65 mm. Each of them is rolled up through a separator, flattened, and packed in a deep-drawing elliptical can having an inner size of 5.2 × 23.2 mm. That is, as shown in FIG. 4, in the innermost circumference, the aluminum foil surfaces face each other through the separator, and in the outermost circumference, the aluminum foil surfaces are exposed on almost the entire surface except a part of the negative electrode protected by the tape, Contact with the inner wall of the can. The tab of the negative electrode is attached by the crimping method.
【００２０】繰り返し使用による容量保持率を図５に、
２５℃雰囲気中での自己放電率を表１に示す。図５か
ら、本比較例は実施例２と比べてわずかに容量保持率が
低いことがわかる。電池解体により、最外周テープ止め
に不備があり、負極活物質面がわずかに露出し、缶内壁
と接触していることが認められている。よって、これは
生産管理上容認できる構造ではない。FIG. 5 shows the capacity retention rate by repeated use.
Table 1 shows the self-discharge rate in an atmosphere of 25 ° C. It can be seen from FIG. 5 that this comparative example has a slightly lower capacity retention rate than Example 2. It has been confirmed that, due to the disassembly of the battery, the outermost peripheral tape fixing was defective, the surface of the negative electrode active material was slightly exposed, and it was in contact with the inner wall of the can. Therefore, this is not an acceptable structure for production management.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【発明の効果】上述のように、本発明の電池構造は、金
属箔に活物質を添着せしめてなる正、負の電極を、セパ
レータを介してロール状に巻き込んでなる電池におい
て、電極の最内周及び最外周をともに全面負極で占め、
更にその内側にセパレータを１周以上巻き込むことによ
って、繰り返し使用による容量低下、及び自己放電の小
さい電池を提供できる。携帯用電気製品の電源として、
高出力、高エネルギー密度電池の開発要求が高まってい
る折から、工業的意義は大きい。As described above, according to the battery structure of the present invention, in the battery in which the positive and negative electrodes formed by attaching the active material to the metal foil are wound in a roll shape through the separator, Both the inner circumference and the outermost circumference are occupied by the entire negative electrode,
Further, by winding the separator one or more times inside the battery, it is possible to provide a battery having a reduced capacity due to repeated use and a small self-discharge. As a power source for portable appliances
It is of great industrial significance because the demand for development of high-power, high-energy-density batteries is increasing.
【図１】本発明の１実施例の捲回体を外装缶に挿入した
ときの巻き初め部分と巻き終わり部分の断面図。FIG. 1 is a cross-sectional view of a winding start portion and a winding end portion when a wound body according to an embodiment of the present invention is inserted into an outer can.
【図２】本発明の１実施例の捲回体を扁平に押しつぶし
て外装缶に挿入したときの巻き初め部分と巻き終わり部
分の断面図。FIG. 2 is a cross-sectional view of a winding start portion and a winding end portion when a wound body according to one embodiment of the present invention is flattened and inserted into an outer can.
【図３】本発明以外の捲回体を扁平に押しつぶして外装
缶に挿入したときの巻き初め部分と巻き終わり部分の断
面図。FIG. 3 is a cross-sectional view of a winding start portion and a winding end portion when a wound body other than the present invention is flattened and inserted into an outer can.
【図４】本発明以外の捲回体を扁平に押しつぶして外装
缶に挿入したときの巻き初め部分と巻き終わり部分の断
面図。FIG. 4 is a cross-sectional view of a winding start portion and a winding end portion when a wound body other than the present invention is flattened and inserted into an outer can.
【図５】実施例１、実施例２、比較例１、比較例２の電
池の各々の初回放電量を１００としたときの充電サイク
ルの繰り返し回数と容量保持率との関係図。FIG. 5 is a relationship diagram between the number of repetitions of the charge cycle and the capacity retention ratio when the initial discharge amount of each of the batteries of Example 1, Example 2, Comparative example 1, and Comparative example 2 is 100.
１．缶体 ２．正極活物質 ３．アルミニウム箔 ４．負極活物質 ５．銅箔 ６．ニッケル箔 ７．セパレータ ８．電流取出し用タブ ９．テープ 1. Can 2. Positive electrode active material 3. Aluminum foil 4. Negative electrode active material 5. Copper foil 6. Nickel foil 7. Separator 8. Current output tab 9. tape
Claims (1)
電体に添着せしめてなる電極を全電極長にわたりセパレ
ータを介して対向配置して巻き込んで成る電池構造にお
いて、該負極が電極の最内周及び最外周を共に占めるこ
とを特徴とする二次電池。1. A battery structure in which electrodes formed by adhering active materials of a positive electrode and a negative electrode to a metal foil current collector are wound so as to face each other with a separator interposed therebetween over the entire length of the electrode, and the negative electrode is the highest electrode. A secondary battery which occupies both the inner circumference and the outermost circumference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3233166A JPH0574496A (en) | 1991-09-12 | 1991-09-12 | Secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3233166A JPH0574496A (en) | 1991-09-12 | 1991-09-12 | Secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0574496A true JPH0574496A (en) | 1993-03-26 |
Family
ID=16950760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3233166A Pending JPH0574496A (en) | 1991-09-12 | 1991-09-12 | Secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0574496A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996010273A1 (en) * | 1994-09-27 | 1996-04-04 | Asahi Kasei Kogyo Kabushiki Kaisha | Non-aqueous type cell |
| EP0655793A3 (en) * | 1993-11-19 | 1997-03-12 | Medtronic Inc | Electrochemical cell with high operational safety and its assembly of electrodes. |
| US6451472B1 (en) | 1999-04-16 | 2002-09-17 | Samsung Sdi Co., Ltd. | Lithium battery and manufacturing method thereof |
| WO2003017411A1 (en) * | 2001-08-06 | 2003-02-27 | Sony Corporation | Non-aqueous electrolytic battery and its manufacturing method |
| JP2009163926A (en) * | 2007-12-28 | 2009-07-23 | Tdk Corp | Wound-type electrochemical device and method for manufacturing wound-type electrochemical device |
| WO2011036960A1 (en) * | 2009-09-28 | 2011-03-31 | 日立ビークルエナジー株式会社 | Lithium-ion secondary cell |
| JP2015128026A (en) * | 2013-12-27 | 2015-07-09 | 日立オートモティブシステムズ株式会社 | Square secondary battery |
| JP2016051538A (en) * | 2014-08-29 | 2016-04-11 | 日立オートモティブシステムズ株式会社 | Prismatic secondary battery |
| CN106299444A (en) * | 2015-06-25 | 2017-01-04 | 丰田自动车株式会社 | Rechargeable nonaqueous electrolytic battery and set of cells |
-
1991
- 1991-09-12 JP JP3233166A patent/JPH0574496A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0655793A3 (en) * | 1993-11-19 | 1997-03-12 | Medtronic Inc | Electrochemical cell with high operational safety and its assembly of electrodes. |
| WO1996010273A1 (en) * | 1994-09-27 | 1996-04-04 | Asahi Kasei Kogyo Kabushiki Kaisha | Non-aqueous type cell |
| US6451472B1 (en) | 1999-04-16 | 2002-09-17 | Samsung Sdi Co., Ltd. | Lithium battery and manufacturing method thereof |
| WO2003017411A1 (en) * | 2001-08-06 | 2003-02-27 | Sony Corporation | Non-aqueous electrolytic battery and its manufacturing method |
| US7132194B2 (en) | 2001-08-06 | 2006-11-07 | Sony Corporation | Non-aqueous electrolytic battery and its manufacturing method |
| EP2075869B1 (en) * | 2007-12-28 | 2013-05-01 | TDK Corporation | Wound-type electrochemical device, and method for manufacturing wound-type electrochemical device |
| JP2009163926A (en) * | 2007-12-28 | 2009-07-23 | Tdk Corp | Wound-type electrochemical device and method for manufacturing wound-type electrochemical device |
| WO2011036960A1 (en) * | 2009-09-28 | 2011-03-31 | 日立ビークルエナジー株式会社 | Lithium-ion secondary cell |
| CN102484285A (en) * | 2009-09-28 | 2012-05-30 | 日立车辆能源株式会社 | Lithium ion secondary battery |
| US20120202097A1 (en) * | 2009-09-28 | 2012-08-09 | Naoki Kimura | Lithium ion secondary cell |
| JP5449377B2 (en) * | 2009-09-28 | 2014-03-19 | 日立ビークルエナジー株式会社 | Lithium ion secondary battery |
| JP2015128026A (en) * | 2013-12-27 | 2015-07-09 | 日立オートモティブシステムズ株式会社 | Square secondary battery |
| JP2016051538A (en) * | 2014-08-29 | 2016-04-11 | 日立オートモティブシステムズ株式会社 | Prismatic secondary battery |
| CN106299444A (en) * | 2015-06-25 | 2017-01-04 | 丰田自动车株式会社 | Rechargeable nonaqueous electrolytic battery and set of cells |
| JP2017010878A (en) * | 2015-06-25 | 2017-01-12 | トヨタ自動車株式会社 | Nonaqueous electrolyte solution secondary battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8119277B2 (en) | Stack type battery | |
| US7935445B2 (en) | Lithium ion secondary battery | |
| CN101682011B (en) | For battery structure and the manufacture method thereof of electrochemical appliance | |
| US5658683A (en) | Method for making a cell | |
| CN212517286U (en) | Roll core, battery and electronic product | |
| WO2002013305A1 (en) | Coin-shaped battery | |
| KR20220092314A (en) | Electrode assembly and rechargeable battery comprising the same | |
| JP3589021B2 (en) | Lithium ion secondary battery | |
| JP3114646B2 (en) | Secondary battery and manufacturing method thereof | |
| JP3033563B2 (en) | Non-aqueous electrolyte secondary battery | |
| JP4245205B2 (en) | Non-aqueous electrolyte battery | |
| JP4245429B2 (en) | Battery with spiral electrode group | |
| JPH0574496A (en) | Secondary battery | |
| JP3182786B2 (en) | Battery | |
| JP2006012703A (en) | Secondary battery | |
| JP2000353502A (en) | Non-aqueous electrolyte secondary battery | |
| JP2009187724A (en) | Winding type lithium ion secondary battery | |
| US20250219093A1 (en) | Secondary battery | |
| WO2023190027A1 (en) | Non-aqueous electrolyte secondary battery | |
| JPH0785885A (en) | Prismatic battery | |
| JP3511709B2 (en) | Thin battery | |
| JP2770334B2 (en) | Non-aqueous electrolyte secondary battery | |
| WO2015077686A1 (en) | High capacity lithium ion battery button cells | |
| JP3139174B2 (en) | Manufacturing method of thin non-aqueous electrolyte battery | |
| JP2506572Y2 (en) | Lithium ion secondary battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20001031 |