JP2008262825A - Coin-shaped nonaqueous electrolytic solution secondary battery - Google Patents
Coin-shaped nonaqueous electrolytic solution secondary battery Download PDFInfo
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- 239000011255 nonaqueous electrolyte Substances 0.000 claims description 30
- 238000004804 winding Methods 0.000 claims description 22
- 229910001416 lithium ion Inorganic materials 0.000 claims description 9
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- 239000003792 electrolyte Substances 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
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- 229910012513 LiSbF 6 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- IDSMHEZTLOUMLM-UHFFFAOYSA-N [Li].[O].[Co] Chemical class [Li].[O].[Co] IDSMHEZTLOUMLM-UHFFFAOYSA-N 0.000 description 1
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- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- QEXMICRJPVUPSN-UHFFFAOYSA-N lithium manganese(2+) oxygen(2-) Chemical class [O-2].[Mn+2].[Li+] QEXMICRJPVUPSN-UHFFFAOYSA-N 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
- H01M10/0427—Button cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/109—Primary casings; Jackets or wrappings characterised by their shape or physical structure of button or coin shape
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
本発明は、放電負荷特性が高いコイン形非水電解液二次電池に関する。 The present invention relates to a coin-type non-aqueous electrolyte secondary battery having high discharge load characteristics.
コイン形リチウムイオン二次電池に代表されるコイン形非水電解液二次電池は、ボタン形又は扁平形非水電解液二次電池とも呼ばれ、ヘッドホンセット、時計型通信機器、身体取付型医療機器等の人が身につけて使用するいわゆるウェアラブル機器等に用いる重負荷対応の小型電池として注目されている。 Coin-type non-aqueous electrolyte secondary batteries, typified by coin-type lithium ion secondary batteries, are also called button-type or flat-type non-aqueous electrolyte secondary batteries. Headphone sets, clock-type communication devices, body-mounted medical care It is attracting attention as a small battery for heavy loads used in so-called wearable devices worn by people such as devices.
従来のコイン形リチウムイオン二次電池としては、例えば、円形に打ち抜いた正極と負極とを1枚づつセパレータを介して積層した電極体を用いたものがある。しかし、このタイプの電池では、電極が厚くなるため、電極の厚さ方向に対するリチウムイオンの拡散抵抗が増加して、放電負荷特性が低下する欠点があり、低出力の用途にしか使用できないという問題がある。 As a conventional coin-type lithium ion secondary battery, for example, there is a battery using an electrode body in which a positive electrode and a negative electrode punched in a circle are stacked one by one via a separator. However, in this type of battery, since the electrode becomes thick, the diffusion resistance of lithium ions in the thickness direction of the electrode increases, and there is a disadvantage that the discharge load characteristic is deteriorated, which can be used only for low-power applications. There is.
上記問題を解決するために、帯状の正極と、帯状の負極とを、帯状のセパレータを介して捲回した電極体を用いることにより、電極を薄くする方法が提案されている(例えば、特許文献1、特許文献2、特許文献3、特許文献4参照。)。
特許文献1及び特許文献2に提案されている電池では、帯状の正極と、帯状の負極とを、帯状のセパレータを介して捲回して電極体を形成し、その電極体を扁平状に成形した後、電極体の捲回軸方向と電池缶の高さ方向(厚さ方向)とが直交した状態で、電極体を電池缶に挿入している。この場合、電池缶内の電極体は、電池の高さ方向から見て四角状に形成されているため、電極体と電池缶との間に隙間が生じ、容積ロスが生じる問題がある。また、この電極構造では、電池の充放電に伴う電極の膨張・収縮方向が電池缶の高さ方向と一致するため、充放電を繰り返すと電池が高さ方向に変形するおそれもある。
In the batteries proposed in
一方、特許文献3及び特許文献4に提案されている電池では、電極体の捲回軸方向と、電池缶の高さ方向とが同一であるため、電極体と電池缶との間に隙間が生ぜず、また、電池の充放電に伴う電極の膨張・収縮方向が電池缶の径方向と一致するため、充放電を繰り返しても電池が変形するおそれもない。 On the other hand, in the batteries proposed in Patent Document 3 and Patent Document 4, since the winding axis direction of the electrode body and the height direction of the battery can are the same, there is a gap between the electrode body and the battery can. In addition, since the expansion / contraction direction of the electrode accompanying charging / discharging of the battery coincides with the radial direction of the battery can, there is no possibility that the battery will be deformed even if charging / discharging is repeated.
しかし、特許文献3及び特許文献4では、単に電極構造が開示されているのみであり、重負荷特性の向上のための具体的構成が一切開示されていない。もちろん、特許文献1及び特許文献2にも重負荷特性の向上のための具体的構成は一切開示されていない。
However, Patent Document 3 and Patent Document 4 merely disclose an electrode structure, and do not disclose any specific configuration for improving heavy load characteristics. Of course, neither
本発明は上記問題を解決したもので、放電負荷特性が高いコイン形非水電解液二次電池を提供するものである。 The present invention solves the above problems and provides a coin-type non-aqueous electrolyte secondary battery having high discharge load characteristics.
本発明のコイン形非水電解液二次電池は、帯状の正極と、帯状の負極と、帯状のセパレータと、コイン形の電池缶とを含むコイン形非水電解液二次電池であって、前記正極と前記負極とは、前記セパレータを介して捲回されて円筒状の捲回体を構成し、前記捲回体の捲回軸方向が、前記電池缶の高さ方向と同一であり、前記捲回体の外径Dと、前記捲回体の捲回軸方向の高さHとの比D/Hが、1〜25であり、前記捲回体の上面部の面積Aと、前記正極と前記負極とが対向している反応有効面積Rとの比R/Aが、9〜25であることを特徴とする。 The coin-type non-aqueous electrolyte secondary battery of the present invention is a coin-type non-aqueous electrolyte secondary battery including a strip-shaped positive electrode, a strip-shaped negative electrode, a strip-shaped separator, and a coin-shaped battery can, The positive electrode and the negative electrode are wound through the separator to form a cylindrical wound body, and the winding axis direction of the wound body is the same as the height direction of the battery can, The ratio D / H between the outer diameter D of the wound body and the height H in the winding axis direction of the wound body is 1 to 25, and the area A of the upper surface portion of the wound body, The ratio R / A of the reaction effective area R in which the positive electrode and the negative electrode face each other is 9 to 25.
本発明によると、放電負荷特性が高く、充放電に伴う電池の変形もないコイン形非水電解液二次電池を提供できる。 According to the present invention, it is possible to provide a coin-type non-aqueous electrolyte secondary battery that has high discharge load characteristics and does not deform the battery due to charge / discharge.
以下、本発明のコイン形非水電解液二次電池の実施形態を説明する。 Hereinafter, embodiments of the coin-type non-aqueous electrolyte secondary battery of the present invention will be described.
本発明のコイン形非水電解液二次電池は、帯状の正極と、帯状の負極と、帯状のセパレータと、コイン形の電池缶とを備え、正極と負極とは、セパレータを介して捲回されて円筒状の捲回体を構成している。この構造により、電極を薄くでき、放電負荷特性をある程度向上できる。 A coin-shaped non-aqueous electrolyte secondary battery of the present invention includes a strip-shaped positive electrode, a strip-shaped negative electrode, a strip-shaped separator, and a coin-shaped battery can, and the positive electrode and the negative electrode are wound through the separator. Thus, a cylindrical wound body is formed. With this structure, the electrode can be made thin and the discharge load characteristics can be improved to some extent.
また、上記捲回体の捲回軸方向は、電池缶の高さ方向と同一とされている。この構造により、電極の膨張・収縮方向と、強度的に強固な電池缶の径方向とが一致し、充放電を繰り返しても電池の変形を防止できる。 Further, the winding axis direction of the wound body is the same as the height direction of the battery can. With this structure, the expansion / contraction direction of the electrode coincides with the radial direction of the battery can that is strong in strength, and deformation of the battery can be prevented even when charging and discharging are repeated.
また、上記捲回体の外径Dと、捲回体の捲回軸方向の高さHとの比D/H(扁平度)は、1〜25に設定されている。D/Hが1未満では、コイン形電池とはいえず、薄型小型で高容量が要求されるウェアラブル機器用のコイン形非水電解液二次電池には適さない。 The ratio D / H (flatness) between the outer diameter D of the wound body and the height H of the wound body in the winding axis direction is set to 1 to 25. If D / H is less than 1, it cannot be said to be a coin-type battery, and is not suitable for a coin-type non-aqueous electrolyte secondary battery for a wearable device that is thin and small and requires a high capacity.
また、D/Hが25を超えると、通常の電池設計の許容範囲を逸脱する。即ち、電極を捲回する製造工程に耐え得る電極幅は最低でも約2mmは必要であるため、捲回体の捲回軸方向の高さHの最小値は2mmである。また、電池を搭載する機器の大きさから、捲回体の外径Dの最大値は50mmと考えられる。このため、D/Hの最大値は25となる。さらに、電池を搭載する機器に必要な電池容量を考慮するとD/Hは1.5〜23がより好ましい。 Moreover, when D / H exceeds 25, it deviates from the tolerance | permissible_range of a normal battery design. That is, since the electrode width that can withstand the manufacturing process of winding the electrode needs to be at least about 2 mm, the minimum value of the height H in the winding axis direction of the wound body is 2 mm. In addition, the maximum value of the outer diameter D of the wound body is considered to be 50 mm from the size of the device on which the battery is mounted. For this reason, the maximum value of D / H is 25. Furthermore, in view of the battery capacity required for the device on which the battery is mounted, the D / H is more preferably 1.5 to 23.
また、本発明のコイン形非水電解液二次電池では、上記捲回体の上面部の面積Aと、上記正極と上記負極とが対向している反応有効面積Rとの比R/Aは、9〜25に設定され、より好ましくは15〜20に設定される。これにより、放電負荷特性をさらに向上でき、重負荷特性が要求される各種機器用の電池として最適となる。ここで、反応有効面積Rは、捲回された正極と負極の活物質層同士が対向している面積をいい、通常リチウムイオン二次電池では、充電時にリチウムデンドライトが生じないように、負極活物質層の面積を正極活物質層の面積よりも大きくし、正極活物質層の全面が負極活物質層に対向しているため、反応有効面積は、実質的には正極活物質層が設けられている部分の面積となる。 In the coin type non-aqueous electrolyte secondary battery of the present invention, the ratio R / A between the area A of the upper surface portion of the wound body and the reaction effective area R where the positive electrode and the negative electrode face each other is , 9-25, more preferably 15-20. As a result, the discharge load characteristics can be further improved, and the battery is optimal as a battery for various devices that require heavy load characteristics. Here, the reaction effective area R is an area where the wound active material layers of the positive electrode and the negative electrode are opposed to each other, and in a normal lithium ion secondary battery, a negative electrode active material R is prevented so that lithium dendrite does not occur during charging. Since the area of the material layer is larger than the area of the positive electrode active material layer, and the entire surface of the positive electrode active material layer faces the negative electrode active material layer, the effective reaction area is substantially provided with the positive electrode active material layer. It becomes the area of the part which is.
また、本発明のコイン形非水電解液二次電池の体積は、1cm3以上7cm3以下であることが好ましい。この範囲内であれば、薄型小型で高容量が要求されるウェアラブル機器用のコイン形非水電解液二次電池として最適となる。 The volume of the coin-type non-aqueous electrolyte secondary battery of the present invention is preferably 1 cm 3 or more and 7 cm 3 or less. Within this range, it is optimal as a coin-type non-aqueous electrolyte secondary battery for wearable devices that are thin and small and require high capacity.
さらに、本発明のコイン形非水電解液二次電池は、電池缶の外径が、20mm以上50mm以下であることが好ましい。この範囲内であれば、上記と同様に薄型小型で高容量が要求されるウェアラブル機器用のコイン形非水電解液二次電池として最適となる。 Furthermore, in the coin-type non-aqueous electrolyte secondary battery of the present invention, the outer diameter of the battery can is preferably 20 mm or more and 50 mm or less. Within this range, it is optimal as a coin-type non-aqueous electrolyte secondary battery for a wearable device that is thin and small and requires a high capacity as described above.
次に、本発明のコイン形非水電解液二次電池の一例を図面に基づき説明する。但し、図1〜図10では、同一部分には同一の符号を付し、重複した説明は省略する場合がある。 Next, an example of the coin type non-aqueous electrolyte secondary battery of the present invention will be described with reference to the drawings. However, in FIGS. 1-10, the same code | symbol is attached | subjected to the same part and the overlapping description may be abbreviate | omitted.
図1は、本発明に用いる捲回体の斜視図である。図1において、捲回体10は、帯状の正極と帯状の負極とを、帯状のセパレータを介して捲回して作製されている。
FIG. 1 is a perspective view of a wound body used in the present invention. In FIG. 1, a
上記正極は、正極活物質、正極用導電助剤、正極用バインダ等を含む混合物に、溶剤を加えて十分に混練して得た正極合剤ペーストを、正極集電体の両面に塗布して乾燥した後に、その正極合剤層を所定の厚さ及び所定の電極密度に制御することにより形成できる。 The positive electrode is obtained by applying a positive electrode mixture paste obtained by sufficiently kneading a mixture containing a positive electrode active material, a positive electrode conductive additive, a positive electrode binder, and the like onto both surfaces of the positive electrode current collector. After drying, the positive electrode mixture layer can be formed by controlling to a predetermined thickness and a predetermined electrode density.
上記正極活物質としては、例えば、LiCoO2等のリチウムコバルト酸化物、LiMn2O4等のリチウムマンガン酸化物、LiNiO2等のリチウムニッケル酸化物等が使用できるが、リチウムイオンを吸蔵・放出可能であればこれらに限定はされない。 Examples of the positive electrode active material include lithium cobalt oxides such as LiCoO 2 , lithium manganese oxides such as LiMn 2 O 4 , lithium nickel oxides such as LiNiO 2, etc., and can absorb and release lithium ions. If it is, it will not be limited to these.
上記正極集電体としては、構成された電池において実質的に化学的に安定な電子伝導体であれば特に限定されない。正極集電体としては、例えば、アルミニウム箔等が用いられる。 The positive electrode current collector is not particularly limited as long as it is an electron conductor that is substantially chemically stable in the battery. As the positive electrode current collector, for example, an aluminum foil or the like is used.
正極集電体の一端部には正極合剤ペーストを塗布していない集電体露出部が設けられ、集電体露出部を折り返すことにより、正極リード11が形成されている。また、集電体露出部は、集電体の両端部に設けてもよく、正極リードも集電体の両端部に設けてもよい。さらに、集電体露出部を折り返して形成する上記正極リードに代えて、正極集電体の一端部又は両端部に別部品としてのタブを溶接して正極リードとしてもよい。
One end of the positive electrode current collector is provided with a current collector exposed portion not coated with the positive electrode mixture paste, and the
上記負極は、負極活物質、負極用導電助剤、負極用バインダ等を含む混合物に、溶剤を加えて十分に混練して得た負極合剤ペーストを、負極集電体の両面に塗布して乾燥した後に、その負極合剤層を所定の厚さ及び所定の電極密度に制御することにより形成できる。 The negative electrode is obtained by applying a negative electrode mixture paste obtained by sufficiently adding a solvent to a mixture containing a negative electrode active material, a negative electrode conductive additive, a negative electrode binder, and the like on both surfaces of a negative electrode current collector. After drying, the negative electrode mixture layer can be formed by controlling to a predetermined thickness and a predetermined electrode density.
上記負極活物質としては、例えば、天然黒鉛又は塊状黒鉛、鱗片状黒鉛、土状黒鉛等の人造黒鉛等の炭素材料が用いられるが、リチウムイオンを吸蔵・放出可能であればこれらに限定はされない。 Examples of the negative electrode active material include carbon materials such as natural graphite or artificial graphite such as massive graphite, flaky graphite, and earthy graphite, but are not limited thereto as long as lithium ions can be occluded / released. .
上記負極集電体としては、構成された電池において実質的に化学的に安定な電子伝導体であれば特に限定されない。負極集電体としては、例えば、銅箔等が用いられる。 The negative electrode current collector is not particularly limited as long as it is an electron conductor that is substantially chemically stable in the constituted battery. For example, a copper foil or the like is used as the negative electrode current collector.
負極集電体の一端部には負極合剤ペーストを塗布していない集電体露出部が設けられ、集電体露出部を折り返すことにより、負極リード12が形成されている。また、集電体露出部は、集電体の両端部に設けてもよく、負極リードも集電体の両端部に設けてもよい。さらに、集電体露出部を折り返して形成する上記負極リードに代えて、負極集電体の一端部又は両端部に別部品としてのタブを溶接して負極リードとしてもよい。
A current collector exposed portion not coated with the negative electrode mixture paste is provided at one end portion of the negative electrode current collector, and the
図1では、正極リード11を捲回体10の外周側に設け、負極リード12を捲回体10の内周側に設けたが、正極リード11を捲回体10の内周側に設け、負極リード12を捲回体10の外周側に設けてもよく、また、正極リード11及び負極リード12をともに捲回体10の外周側に設けてもよい。
In FIG. 1, the
上記セパレータとしては、大きなイオン透過度及び所定の機械的強度を有する絶縁性の微多孔性薄膜が用いられる。また、一定温度以上(100〜140℃)で微孔を閉塞し、抵抗を上げる機能を有するものが、電池の安全性向上の点から好ましい。具体的には、上記セパレータとしては、耐有機溶剤性及び疎水性を有するポリプロピレン、ポリエチレン等のオレフィン系ポリマー又はガラス繊維からなるシート、不織布、織布、又はオレフィン系の粒子を接着剤で固着した多孔質体層等が用いられる。 As the separator, an insulating microporous thin film having a large ion permeability and a predetermined mechanical strength is used. Moreover, what has the function to block | close a micropore and to raise resistance above a fixed temperature (100-140 degreeC) is preferable from the point of the safety | security improvement of a battery. Specifically, as the separator, a sheet, a nonwoven fabric, a woven fabric, or an olefin-based particle made of an olefin-based polymer or glass fiber such as polypropylene and polyethylene having organic solvent resistance and hydrophobicity is fixed with an adhesive. A porous body layer or the like is used.
図2は、捲回体10を円筒状の電池缶13に挿入している工程を示す斜視図である。捲回体10は、その捲回軸方向Nが電池缶13の高さ方向Mと同一となるように、電池缶13に挿入される。電池缶13の材質は、アルミニウム等が用いられる。また、電池缶13の底部には、下部絶縁板(図示せず。)が配置されている。下部絶縁板の材質は特に限定されず、ポリフェニレンサルファイド(PPS)等の高分子材料を用いることができる。
FIG. 2 is a perspective view showing a process of inserting the
図3は、捲回体10を電池缶13に挿入した後に、捲回体10の上に上部絶縁板14を配置している工程を示す斜視図である。上部絶縁板14の材質は、上記下部絶縁板と同様の材質が使用できる。
FIG. 3 is a perspective view illustrating a process in which the upper insulating
図4は、上部絶縁板14を捲回体10の上に載置し、蓋15の中央部に配置された負極端子16の裏部と負極リード12とを溶接した状態の斜視図である。蓋15と負極端子16とは、絶縁パッキング17によって絶縁されている。蓋15の材質は、電池缶13と同様にアルミニウム等が用いられる。負極端子16の材質は、ニッケル等が用いられる。絶縁パッキング17の材質は、ポリプロピレン(PP)等の高分子材料を用いることができる。
FIG. 4 is a perspective view of a state in which the upper insulating
図5Aは、電池缶13と蓋15とをレーザー溶接等により接合した状態の斜視図である。図5Bは、図5AのB−B線の断面図である。図5Bにおいて、蓋15と電池缶13とで形成された密閉容器内に捲回体10が収納され、電池缶13の底部には下部絶縁板19が配置されている。但し、図5Bでは、捲回体10の内周側の部分は断面にしていない。捲回体10は、前述のとおり、帯状の正極1と帯状の負極2とを、帯状のセパレータ3を介して渦巻状に捲回した構造を有している。また、正極リード11は、電池缶13と蓋15との間に挟まれた状態で接合されている。これにより、電池缶13及び蓋15が正極端子として機能する。但し、電池缶13の材質によっては、電池缶13及び蓋15が負極となる場合もある。最後に、注液口18から、電解液を注液し、注液口18を封口体(図示せず。)によって封口すればコイン形非水電解液二次電池が完成する。
FIG. 5A is a perspective view of a state in which the battery can 13 and the
上記電解液は、例えば、ビニレンカーボネート(VC)、プロピレンカーボネート(PC)、エチレンカーボネート(EC)、ブチレンカーボネート(BC)、ジメチルカーボネート(DMC)、ジエチルカーボネート(DEC)、メチルエチルカーボネート(MEC)、γ−ブチロラクトン等の有機溶媒を1種類又は2種類以上混合した溶媒に、例えば、LiClO4、LiPF6、LiBF4、LiAsF6、LiSbF6、LiCF3SO3等から選ばれる少なくとも1種類のリチウム塩を溶解させた電解液を用いればよい。この電解液中のLiイオンの濃度は、0.5〜1.5mol/Lとすればよい。 Examples of the electrolyte include vinylene carbonate (VC), propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (MEC), the organic solvent of γ- butyrolactone to one or more kinds mixed solvent, for example, at least one lithium salt selected from LiClO 4, LiPF 6, LiBF 4 , LiAsF 6, LiSbF 6, LiCF 3 SO 3 , etc. An electrolytic solution in which is dissolved may be used. The concentration of Li ions in the electrolytic solution may be 0.5 to 1.5 mol / L.
図6は、捲回体10の模式図である。図6では、正極リード及び負極リードの図示を省略している。捲回体10の外径D(mm)と、捲回体10の捲回軸方向の高さH(mm)との比D/Hは、1〜25に設定されている。また、捲回体10の上面部の面積A(mm2)と、正極と負極とが対向している反応有効面積R(mm2)との比R/Aは、9〜25に設定されている。
FIG. 6 is a schematic diagram of the
図7は、本発明のパラメータを説明するための正極の模式図である。図7において、帯状の正極20の正極集電体21の両面には、第1正極活物質層22と、第1正極活物質層22より短く形成された第2正極活物質層23とが形成されている。正極活物質層が形成されていない正極集電体21の端部は折り曲げられて正極リード24を形成している。ここで、第1正極活物質層22の長さをL(mm)、第2正極活物質層23の長さをJ(mm)、正極集電体21の幅をW(mm)とすると、反応有効面積R(mm2)は、R=(L+J)×Wとなる。
FIG. 7 is a schematic diagram of a positive electrode for explaining parameters of the present invention. In FIG. 7, the first positive electrode
また、正極集電体21、第1正極活物質層22、第2正極活物質層23を含む正極20の断面積をB(mm2)、正極リードの数をnとすると、これらの比L/(B×n)は2000〜8000が好ましい。
Further, assuming that the cross-sectional area of the
図8は、図7のI−I線の断面図である。また、図9は、図7のII−II線の断面図である。ここで、正極リード24の断面積をC(mm2)、正極リードの数をn、正極集電体21の断面積をS(mm2)とすると、これらの比(C×n)/Sは1以上であることが好ましい。
8 is a cross-sectional view taken along the line II of FIG. FIG. 9 is a sectional view taken along line II-II in FIG. Here, assuming that the cross-sectional area of the
図10は、図7の正極リードの他の形態を示す斜視図である。図10では、正極集電体21の端部にタブを溶接することにより正極リード25を形成している。図10の形態であっても、上記した比L/(B×n)、比(C×n)/Sの好適範囲は同様である。
FIG. 10 is a perspective view showing another form of the positive electrode lead of FIG. In FIG. 10, the
以下、実施例に基づき本発明を説明するが、本発明は以下の実施例に限定されるものではない。 EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to a following example.
(実施例1)
<正極の作製>
正極活物質であるLiCoO2:80重量部と、導電助剤であるアセチレンブラック:10重量部と、バインダであるポリフッ化ビニリデン(PVDF):5重量部とに、N−メチル−2−ピロリドン(NMP)を溶剤として加えて、均一になるように混合して正極合剤含有ペーストを調製した。この正極合剤含有ペーストを、正極集電体となる厚さ20μmのアルミニウム箔の両面に、表面側の活物質塗布長が1221mm、裏面側の活物質塗布長が1155mmになるように塗布し、乾燥した。その後、カレンダー処理を行って、全厚が134μmになるように電極の厚さを調整し、幅3.0mmになるように切断して、帯状の正極を作製した。作製した帯状の正極の両端部には、活物質未塗布部が形成されている。
Example 1
<Preparation of positive electrode>
LiCoO 2 as a positive electrode active material: 80 parts by weight, acetylene black as a conductive auxiliary agent: 10 parts by weight, polyvinylidene fluoride (PVDF) as a binder: 5 parts by weight, N-methyl-2-pyrrolidone ( NMP) was added as a solvent and mixed uniformly to prepare a positive electrode mixture-containing paste. This positive electrode mixture-containing paste was applied to both surfaces of an aluminum foil having a thickness of 20 μm serving as a positive electrode current collector so that the active material application length on the front surface side was 1221 mm and the active material application length on the back surface side was 1155 mm. Dried. Thereafter, calendering was performed, the thickness of the electrode was adjusted so that the total thickness was 134 μm, and the electrode was cut so as to have a width of 3.0 mm to produce a strip-like positive electrode. Active material uncoated portions are formed at both ends of the produced belt-like positive electrode.
ここで、上記正極集電体の表面側とは、捲回体を形成した場合の外周側をいい、その裏面側とは、捲回体を形成した場合の内周側をいい、後述する負極集電体の場合も同様である。 Here, the surface side of the positive electrode current collector refers to the outer peripheral side when the wound body is formed, and the back surface side refers to the inner peripheral side when the wound body is formed. The same applies to the current collector.
<負極の作製>
負極活物質である黒鉛:90重量部と、バインダであるPVDF:5重量部とに、NMPを溶剤として加えて、均一になるように混合して負極合剤含有ペーストを調製した。この負極合剤含有ペーストを、負極集電体となる厚さ12μmの銅箔の両面に、表面側の活物質塗布長が1207mm、裏面側の活物質塗布長が1207mmになるように塗布し、乾燥した。その後、カレンダー処理を行って、全厚が142μmになるように電極の厚さを調整し、幅3.5mmになるように切断して、帯状の負極を作製した。作製した帯状の負極の両端部には、活物質未塗布部が形成されている。
<Production of negative electrode>
A negative electrode mixture-containing paste was prepared by adding NMP as a solvent to graphite: 90 parts by weight of negative electrode active material and PVDF: 5 parts by weight of binder and mixing uniformly. This negative electrode mixture-containing paste was applied to both sides of a 12 μm thick copper foil serving as a negative electrode current collector so that the active material application length on the front surface side was 1207 mm and the active material application length on the back surface side was 1207 mm. Dried. Thereafter, calendering was performed, the thickness of the electrode was adjusted so that the total thickness was 142 μm, and the electrode was cut so as to have a width of 3.5 mm to produce a strip-shaped negative electrode. Active material uncoated portions are formed at both ends of the produced strip-shaped negative electrode.
<捲回体の作製>
上記のように作製した帯状の正極と負極との間に、厚さ20μm、幅4.3mmのポリエチレン製の微多孔性フィルムよりなるセパレータを配置して捲回して、捲回体を作製した。捲回体は、正極の両面の正極活物質塗布部が全て負極活物質塗布部と対向するように形成した。次に、正極の活物質未塗布部のアルミニウム箔を、捲回体の外周部側の端部より折り返して取り出し、正極リードを1本形成した。また、負極の活物質未塗布部の銅箔を、捲回体の内周部側(中心側)の端部より折り返して取り出し、負極リードを1本形成した。
<Production of wound body>
A separator made of a polyethylene microporous film having a thickness of 20 μm and a width of 4.3 mm was placed between the belt-like positive electrode and the negative electrode prepared as described above, and wound to prepare a wound body. The wound body was formed so that all the positive electrode active material application portions on both sides of the positive electrode were opposed to the negative electrode active material application portions. Next, the aluminum foil in the positive electrode active material uncoated portion was folded back from the end on the outer peripheral side of the wound body, and one positive electrode lead was formed. Further, the copper foil in the negative electrode active material uncoated portion was folded back from the end on the inner peripheral side (center side) of the wound body to form one negative electrode lead.
作製した捲回体の外径Dは、23.5mm、捲回体の高さHは3.7mm、これらの比D/Hは6.4であった。また、捲回体の上面部の面積Aは398mm2、反応有効面積Rは7128mm2、これらの比R/Aは17.9であった。 The wound body produced had an outer diameter D of 23.5 mm, a wound body height H of 3.7 mm, and a ratio D / H thereof of 6.4. Also, the area A of the upper surface portion of the wound body 398 mm 2, the effective reaction area R is 7128Mm 2, the ratios R / A was 17.9.
<電解液の調製>
エチレンカーボネート(EC)とジエチルカーボネート(DEC)との混合溶媒(EC:DECの混合体積比は1:2)中にLiPF6を1.2mol/L溶解させた電解液を調製した。
<Preparation of electrolyte>
An electrolyte solution was prepared by dissolving LiPF 6 in an amount of 1.2 mol / L in a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC) (EC: DEC mixed volume ratio is 1: 2).
<電池の作製>
外径24mm、高さ5.0mm、側面厚さ0.25mm、底面厚さ0.3mmのアルミニウム製の電池缶と、直径24mm、厚さ0.4mmのアルミニウム製の蓋を準備した。蓋の中央には、直径6mmのニッケル製の負極端子がポリプロピレン製のパッキングを介して嵌合されている。次に、上記電池缶の底部に、厚さ0.05mmのPPS製の下部絶縁板を配置した後、捲回体の捲回軸方向が電池缶の高さ方向と同一となるように、上記捲回体を電池缶内に挿入した。次に、捲回体の上部に厚さ0.05mmのPPS製の上部絶縁板を配置した後、負極リードを負極端子の裏側に溶接した。その後、正極リードを電池缶と蓋との間に挟んだまま電池缶と蓋とをレーザー溶接により接合した。
<Production of battery>
An aluminum battery can having an outer diameter of 24 mm, a height of 5.0 mm, a side surface thickness of 0.25 mm, and a bottom surface thickness of 0.3 mm, and an aluminum lid having a diameter of 24 mm and a thickness of 0.4 mm were prepared. In the center of the lid, a nickel negative electrode terminal having a diameter of 6 mm is fitted through a polypropylene packing. Next, a PPS lower insulating plate having a thickness of 0.05 mm is disposed at the bottom of the battery can, and then the winding axis direction of the winding body is the same as the height direction of the battery can. The wound body was inserted into the battery can. Next, after placing an upper insulating plate made of PPS having a thickness of 0.05 mm on the upper part of the wound body, the negative electrode lead was welded to the back side of the negative electrode terminal. Thereafter, the battery can and the lid were joined by laser welding while the positive electrode lead was sandwiched between the battery can and the lid.
最後に、蓋に設けられた直径1.5mmの注液口から上記電解液を注液し、電極体に電解液を十分に浸透させた後、封止ピンを注液口に挿入してレーザー溶接することにより封口して、電池体積が2.3cm3のコイン形リチウムイオン二次電池を作製した。 Finally, the electrolyte solution is injected from a 1.5 mm diameter injection port provided on the lid, and after the electrolyte solution is sufficiently infiltrated into the electrode body, a sealing pin is inserted into the injection port and the laser is inserted. Sealing was performed by welding to produce a coin-type lithium ion secondary battery having a battery volume of 2.3 cm 3 .
(実施例2)
<正極の作製>
正極集電体の厚さを25μm、活物質塗布長を表面側678mm、裏面側624mm、カレンダー処理後の全厚を162μm、幅を2.0mmとした以外は、実施例1と同様にして正極を作製した。
(Example 2)
<Preparation of positive electrode>
The positive electrode current collector was the same as in Example 1 except that the thickness of the positive electrode current collector was 25 μm, the active material coating length was 678 mm on the front surface side, 624 mm on the back surface side, the total thickness after calendar treatment was 162 μm, and the width was 2.0 mm. Was made.
<負極の作製>
負極集電体の厚さを20μm、活物質塗布長を表面側667mm、裏面側667mm、カレンダー処理後の全厚を177μm、幅を2.5mmとした以外は、実施例1と同様にして負極を作製した。
<Production of negative electrode>
A negative electrode current collector as in Example 1, except that the thickness of the negative electrode current collector was 20 μm, the active material coating length was 667 mm on the front surface side, 667 mm on the back surface side, the total thickness after calendering was 177 μm, and the width was 2.5 mm. Was made.
上記正極及び上記負極を用い、セパレータの幅を3.3mmとし、外径20mm、高さ4.0mmの電池缶を用いた以外は、実施例1と同様にして、電池体積が1.3cm3のコイン形非水電解液二次電池を作製した。 The battery volume was 1.3 cm 3 in the same manner as in Example 1 except that the positive electrode and the negative electrode were used, the separator width was 3.3 mm, and a battery can with an outer diameter of 20 mm and a height of 4.0 mm was used. A coin type non-aqueous electrolyte secondary battery was prepared.
本実施例の捲回体の外径Dは、19.5mm、捲回体の高さHは2.7mm、これらの比D/Hは7.2であった。また、捲回体の上面部の面積Aは269mm2、反応有効面積Rは2604mm2、これらの比R/Aは9.7であった。 The outer diameter D of the wound body of this example was 19.5 mm, the height H of the wound body was 2.7 mm, and the ratio D / H thereof was 7.2. The area A of the upper surface of the wound body was 269 mm 2 , the reaction effective area R was 2604 mm 2 , and the ratio R / A thereof was 9.7.
(実施例3)
<正極の作製>
活物質塗布長を表面側3146mm、裏面側3047mm、カレンダー処理後の全厚を115μm、幅を3.5mmとした以外は、実施例1と同様にして正極を作製した。
(Example 3)
<Preparation of positive electrode>
A positive electrode was produced in the same manner as in Example 1 except that the active material coating length was 3146 mm on the front surface side, 3047 mm on the back surface side, the total thickness after the calendar treatment was 115 μm, and the width was 3.5 mm.
<負極の作製>
活物質塗布長を表面側3121mm、裏面側3121mm、カレンダー処理後の全厚を122μm、幅を4.0mmとした以外は、実施例1と同様にして、負極を作製した。
<Production of negative electrode>
A negative electrode was produced in the same manner as in Example 1, except that the active material coating length was 3121 mm on the front surface side, 3121 mm on the back surface side, the total thickness after calendar treatment was 122 μm, and the width was 4.0 mm.
上記正極及び上記負極を用い、セパレータの幅を4.8mmとし、外径35mm、高さ5.5mmの電池缶を用いた以外は、実施例1と同様にして、電池体積が5.3cm3のコイン形非水電解液二次電池を作製した。 The battery volume was 5.3 cm 3 in the same manner as in Example 1 except that the positive electrode and the negative electrode were used, the battery width was 4.8 mm, the outer diameter was 35 mm, and the height was 5.5 mm. A coin type non-aqueous electrolyte secondary battery was prepared.
本実施例の捲回体の外径Dは、34.5mm、捲回体の高さHは4.2mm、これらの比D/Hは8.2であった。また、捲回体の上面部の面積Aは881mm2、反応有効面積Rは21676mm2、これらの比R/Aは24.6であった。 The outer diameter D of the wound body of this example was 34.5 mm, the height H of the wound body was 4.2 mm, and the ratio D / H thereof was 8.2. The area A of the upper surface portion of the wound body was 881 mm 2 , the reaction effective area R was 21676 mm 2 , and the ratio R / A thereof was 24.6.
(比較例1)
<正極の作製>
活物質塗布長を表面側1750mm、裏面側1685mm、カレンダー処理後の全厚を89μmとした以外は、実施例1と同様にして正極を作製した。
(Comparative Example 1)
<Preparation of positive electrode>
A positive electrode was produced in the same manner as in Example 1 except that the active material coating length was 1750 mm on the front surface side, 1685 mm on the back surface side, and the total thickness after the calendar treatment was 89 μm.
<負極の作製>
活物質塗布長を表面側1735mm、裏面側1735mm、カレンダー処理後の全厚を91μmとした以外は、実施例1と同様にして負極を作製した。
<Production of negative electrode>
A negative electrode was produced in the same manner as in Example 1 except that the active material coating length was 1735 mm on the front surface side, 1735 mm on the back surface side, and the total thickness after the calendar treatment was 91 μm.
上記正極及び上記負極を用いた以外は、実施例1と同様にして、電池体積が2.3cm3のコイン形非水電解液二次電池を作製した。 A coin-type non-aqueous electrolyte secondary battery having a battery volume of 2.3 cm 3 was produced in the same manner as in Example 1 except that the positive electrode and the negative electrode were used.
本比較例の捲回体の外径Dは、23.5mm、捲回体の高さHは3.7mm、これらの比D/Hは6.4であった。また、捲回体の上面部の面積Aは398mm2、反応有効面積Rは10305mm2、これらの比R/Aは25.9であった。 The outer diameter D of the wound body of this comparative example was 23.5 mm, the height H of the wound body was 3.7 mm, and the ratio D / H thereof was 6.4. Also, the area A of the upper surface portion of the wound body 398 mm 2, the effective reaction area R is 10305Mm 2, the ratios R / A was 25.9.
(比較例2)
<正極の作製>
正極集電体の厚さを25μm、活物質塗布長を表面側603mm、裏面側548mm、カレンダー処理後の全厚を185μm、幅を2.0mmとした以外は、実施例1と同様にして正極を作製した。
(Comparative Example 2)
<Preparation of positive electrode>
The positive electrode current collector was the same as in Example 1 except that the thickness of the positive electrode current collector was 25 μm, the active material coating length was 603 mm on the front surface side, 548 mm on the back surface side, the total thickness after calendering was 185 μm, and the width was 2.0 mm. Was made.
<負極の作製>
負極集電体の厚さを20μm、活物質塗布長を表面側592mm、裏面側592mm、カレンダー処理後の全厚を203μm、幅を2.5mmとした以外は、実施例1と同様にして負極を作製した。
<Production of negative electrode>
The negative electrode current collector was 20 μm, the active material coating length was 592 mm on the front surface side, 592 mm on the back surface side, the total thickness after calendar treatment was 203 μm, and the width was 2.5 mm. Was made.
上記正極及び上記負極を用い、セパレータの幅を3.3mmとし、外径20mm、高さ4.0mmの電池缶を用いた以外は、実施例1と同様にして、電池体積が1.3cm3のコイン形非水電解液二次電池を作製した。 The battery volume was 1.3 cm 3 in the same manner as in Example 1 except that the positive electrode and the negative electrode were used, the separator width was 3.3 mm, and a battery can with an outer diameter of 20 mm and a height of 4.0 mm was used. A coin type non-aqueous electrolyte secondary battery was prepared.
本比較例の捲回体の外径Dは、19.5mm、捲回体の高さHは2.7mm、これらの比D/Hは7.2であった。また、捲回体の上面部の面積Aは269mm2、反応有効面積Rは2302mm2、これらの比R/Aは8.6であった。 The outer diameter D of the wound body of this comparative example was 19.5 mm, the height H of the wound body was 2.7 mm, and the ratio D / H thereof was 7.2. The area A of the upper surface of the wound body was 269 mm 2 , the reaction effective area R was 2302 mm 2 , and the ratio R / A thereof was 8.6.
実施例1〜3及び比較例1、2の正極及び負極の各寸法を表1及び表2にまとめて示す。 Tables 1 and 2 collectively show the dimensions of the positive and negative electrodes of Examples 1 to 3 and Comparative Examples 1 and 2.
また、実施例1〜3及び比較例1、2の電池パラメータ及び捲回体パラメータを表3及び表4に示す。 Table 3 and Table 4 show battery parameters and wound body parameters of Examples 1 to 3 and Comparative Examples 1 and 2.
<電池特性の評価>
実施例1〜3及び比較例1、2の各電池について、0.2Cで4.3Vまで定電流充電を行い、その後、電流値が0.02Cとなるまで定電圧充電を行った。次に、0.2Cで3.0Vまで定電流放電を行って初期容量(a)を求めた。なお、「C」とは、電池の設計容量を1時間で放電する場合の電流値を意味する。
<Evaluation of battery characteristics>
About each battery of Examples 1-3 and Comparative Examples 1 and 2, the constant current charge was performed to 4.3V at 0.2C, and the constant voltage charge was performed until the electric current value was set to 0.02C after that. Next, constant current discharge was performed to 0.2V at 0.2 C, and the initial capacity (a) was obtained. Note that “C” means a current value when the design capacity of the battery is discharged in one hour.
続いて、各電池を0.2Cで4.3Vまで定電流充電を行い、その後、電流値が0.02Cとなるまで定電圧充電を行った。次に、2Cで3.0Vまで定電流放電を行って重負荷容量(b)を求めた。 Subsequently, each battery was subjected to constant current charging at 0.2 C to 4.3 V, and thereafter, constant voltage charging was performed until the current value reached 0.02 C. Next, a constant current discharge was performed at 2C up to 3.0 V to obtain a heavy load capacity (b).
上記結果から容量維持率Z(%)を下記式から求め、放電負荷特性として評価した。 From the above results, the capacity retention ratio Z (%) was obtained from the following formula and evaluated as discharge load characteristics.
Z=(b/a)×100 Z = (b / a) × 100
上記電池特性を、パラメータD/H及びパラメータR/Aとともに表5に示す。 The battery characteristics are shown in Table 5 together with parameter D / H and parameter R / A.
<サイクル特性の評価>
充放電サイクル試験を次にように行った。充電は各電池について、0.5Cで4.3Vまで定電流充電を行い、その後、電流値が0.02Cとなるまで定電圧充電を行った。放電は、1Cで3.0Vまで定電流放電を行った。この充放電を1サイクルとして200サイクルまで繰り返した。次に、電池の外観を目視により観察し、電池の変形の有無を確認した。その結果を表5に示す。
<Evaluation of cycle characteristics>
The charge / discharge cycle test was conducted as follows. For each battery, constant current charging was performed at 0.5 C to 4.3 V, and then constant voltage charging was performed until the current value reached 0.02 C. Discharge performed constant current discharge to 3.0V at 1C. This charging / discharging was repeated up to 200 cycles as one cycle. Next, the appearance of the battery was visually observed to confirm whether the battery was deformed. The results are shown in Table 5.
表5から、パラメータR/Aが9〜25の範囲内にある実施例1〜3は、その範囲外にある比較例1、2に比べて容量維持率Z(重負荷特性)が高いことが分かる。また、実施例1〜3及び比較例1、2の各電池では充放電を200回繰り返しても電池の変形は一切認められなかった。 From Table 5, Examples 1 to 3 in which the parameter R / A is within the range of 9 to 25 have a higher capacity retention ratio Z (heavy load characteristic) than Comparative Examples 1 and 2 outside the range. I understand. Further, in each of the batteries of Examples 1 to 3 and Comparative Examples 1 and 2, no deformation of the battery was observed even when charging / discharging was repeated 200 times.
以上説明したように、本発明は、放電負荷特性が高く、充放電に伴う電池の変形もないコイン形非水電解液二次電池を提供できる。このコイン形非水電解液二次電池は、ウェアラブル機器用の電源だけでなく、様々な機器の電源として広く利用できる。 As described above, the present invention can provide a coin-type non-aqueous electrolyte secondary battery having high discharge load characteristics and no battery deformation due to charge / discharge. This coin-type non-aqueous electrolyte secondary battery can be widely used not only as a power source for wearable devices but also as a power source for various devices.
1 正極
2 負極
3 セパレータ
10 捲回体
11 正極リード
12 負極リード
13 電池缶
14 上部絶縁板
15 蓋
16 負極端子
17 絶縁パッキング
18 注液口
19 下部絶縁板
20 正極
21 正極集電体
22 第1正極活物質層
23 第2正極活物質層
24 正極リード
25 正極リード
DESCRIPTION OF
Claims (5)
前記正極と前記負極とは、前記セパレータを介して捲回されて円筒状の捲回体を構成し、
前記捲回体の捲回軸方向が、前記電池缶の高さ方向と同一であり、
前記捲回体の外径D(mm)と、前記捲回体の捲回軸方向の高さH(mm)との比D/Hが、1〜25であり、
前記捲回体の上面部の面積A(mm2)と、前記正極と前記負極とが対向している反応有効面積R(mm2)との比R/Aが、9〜25であることを特徴とするコイン形非水電解液二次電池。 A coin-shaped non-aqueous electrolyte secondary battery including a strip-shaped positive electrode, a strip-shaped negative electrode, a strip-shaped separator, and a coin-shaped battery can,
The positive electrode and the negative electrode are wound through the separator to form a cylindrical wound body,
The winding axis direction of the wound body is the same as the height direction of the battery can,
The ratio D / H between the outer diameter D (mm) of the wound body and the height H (mm) in the winding axis direction of the wound body is 1 to 25,
The ratio R / A of the area A (mm 2 ) of the upper surface portion of the wound body and the reaction effective area R (mm 2 ) where the positive electrode and the negative electrode face each other is 9 to 25. A coin-type non-aqueous electrolyte secondary battery.
Priority Applications (3)
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JP2007105148A JP2008262825A (en) | 2007-04-12 | 2007-04-12 | Coin-shaped nonaqueous electrolytic solution secondary battery |
KR1020080025755A KR20080092842A (en) | 2007-04-12 | 2008-03-20 | Coin type nonaqueous electrolyte secondary battery |
CNA2008100921646A CN101286572A (en) | 2007-04-12 | 2008-04-10 | Nummular non-aqueous electrolyte secondary battery |
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JP2007105148A JP2008262825A (en) | 2007-04-12 | 2007-04-12 | Coin-shaped nonaqueous electrolytic solution secondary battery |
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JP2007105148A Withdrawn JP2008262825A (en) | 2007-04-12 | 2007-04-12 | Coin-shaped nonaqueous electrolytic solution secondary battery |
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JP (1) | JP2008262825A (en) |
KR (1) | KR20080092842A (en) |
CN (1) | CN101286572A (en) |
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- 2007-04-12 JP JP2007105148A patent/JP2008262825A/en not_active Withdrawn
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