JPH0428175A - Nonaqueous electrolytic liquid secondary battery - Google Patents
Nonaqueous electrolytic liquid secondary batteryInfo
- Publication number
- JPH0428175A JPH0428175A JP2133430A JP13343090A JPH0428175A JP H0428175 A JPH0428175 A JP H0428175A JP 2133430 A JP2133430 A JP 2133430A JP 13343090 A JP13343090 A JP 13343090A JP H0428175 A JPH0428175 A JP H0428175A
- Authority
- JP
- Japan
- Prior art keywords
- positive
- charging
- discharging
- lithium
- 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
- 239000007788 liquid Substances 0.000 title abstract 2
- 239000011255 nonaqueous electrolyte Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052744 lithium Inorganic materials 0.000 abstract description 19
- 238000007599 discharging Methods 0.000 abstract description 10
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000004804 winding 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)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、非水電解液二次電池の安全性および充放電サ
イクル特性の向上に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improving the safety and charge/discharge cycle characteristics of non-aqueous electrolyte secondary batteries.
従来の技術
近年、ＡＶ機器などエレクトロニクス機器のボータプル
化、コードレス化に伴い、その駆動用電源として、小形
、軽量であり、しかも高エネルギー密度のリチウム二次
電池への期待が大きい。BACKGROUND OF THE INVENTION In recent years, as electronic devices such as AV devices have become portable and cordless, there are great expectations for small, lightweight, and high energy density lithium secondary batteries as power sources for driving them.
これまでのこの種電池の正極板の構成断面図を第１図（
Ａ）に、円筒形リチウム二次電池の構成断面図を第２図
にそれぞれ示す。Figure 1 (
A) and FIG. 2 show a cross-sectional view of the structure of a cylindrical lithium secondary battery.
正極板３は二酸化マンガンなどを活物質とし、これと導
電剤、増粘剤および結着剤を混練し、ペースト状とした
合剤１を、アルミニウム箔なとを芯材２としてその両面
に塗着、乾燥し、圧延したものである。正極リード板６
は芯材２にスポット溶接する。負極板４は金属リチウム
などを活物質とし、負極リード板７を圧着する。セパレ
ータ５はポリプロピレンなどからなる多孔性フィルムを
正負極板よりも幅広く裁断したものである。正負極板の
相互間にこのセパレータ５を介在させて全体を渦巻き状
に巻回し、電極体を構成する。正負極板およびセパレー
タの設計寸法を第１表に示す。The positive electrode plate 3 uses manganese dioxide or the like as an active material, and mixes this with a conductive agent, a thickener, and a binder to form a paste, and then applies a paste mixture 1 to both sides of the core material 2, such as aluminum foil. It is coated, dried and rolled. Positive electrode lead plate 6
is spot welded to core material 2. The negative electrode plate 4 uses metallic lithium or the like as an active material, and the negative electrode lead plate 7 is pressure-bonded. The separator 5 is made by cutting a porous film made of polypropylene or the like to be wider than the positive and negative electrode plates. The separator 5 is interposed between the positive and negative electrode plates, and the whole is spirally wound to form an electrode body. Table 1 shows the design dimensions of the positive and negative electrode plates and separators.
次に、上記電極体の上下部を温風で加熱し、セパレータ
５を熱収縮させる。下部絶縁リング８を装着し、ケース
９に収容して負極リード板７の先端をケース９にスポッ
ト溶接する。その後上部絶縁リング１０を装着し、ケー
ス９の上部に溝入れした後、６フツ化リン酸リチウムな
どのリチウム塩をプロピレンカーボネート、エチレンカ
ーボネートなどの有機溶媒に溶解させた非水電解液を第
１表
注入する。ガスケットが組みこまれた組立封口板１１と
正極リード板６をスポット溶接した後、装着しカシメ封
口する。これにより電池の組み立てを完了する。Next, the upper and lower parts of the electrode body are heated with hot air to thermally shrink the separator 5. The lower insulating ring 8 is attached and housed in the case 9, and the tip of the negative electrode lead plate 7 is spot welded to the case 9. After that, the upper insulating ring 10 is attached and a groove is made in the upper part of the case 9, and then a non-aqueous electrolyte in which a lithium salt such as lithium hexafluorophosphate is dissolved in an organic solvent such as propylene carbonate or ethylene carbonate is added to the first insulating ring 10. Top injection. After the assembly sealing plate 11 in which the gasket is assembled and the positive electrode lead plate 6 are spot-welded, they are attached and sealed by caulking. This completes the assembly of the battery.
発明が解決しようとする課題
リチウム二次電池では、放電によりリチウムか負極から
電解液中にイオンとして溶解し、充電により再び負極上
に析出する。その析出形態は、電解液の組成および充電
条件により異なるが、主に針状となり、充放電を繰り返
すに伴い成長し、これがセパレータを貫通して正極と接
触し、内部短絡および発火の原因となる。電池を構成し
、充放電させた後、分解し観察した結果、特に電極体の
上下部に堆積した針状リチウムが顕著に見られた。また
、遊離した片状リチウムも観察された。Problems to be Solved by the Invention In a lithium secondary battery, lithium is dissolved as ions from the negative electrode into the electrolytic solution upon discharge, and deposited on the negative electrode again upon charging. The form of the deposit varies depending on the composition of the electrolyte and charging conditions, but it is mainly needle-shaped and grows as charging and discharging are repeated, penetrating the separator and coming into contact with the positive electrode, causing an internal short circuit and ignition. . After the battery was constructed and charged and discharged, it was disassembled and observed. As a result, acicular lithium deposited on the upper and lower parts of the electrode body was particularly noticeable. In addition, free flaky lithium was also observed.
これは電極体の上下部は、正負極板ともに熱収縮したセ
パレータによる圧迫を受けておらず、空隙が生じて、こ
こに電解液が十分に浸透し、充放電反応が活発に行われ
るためと考えられる。堆積した針状リチウムあるいは遊
離した片状リチウムが正極と接触し、内部短絡および発
火の原因となる。This is because the upper and lower parts of the electrode body are not compressed by the heat-shrinked separators for both the positive and negative electrode plates, and a gap is created in which the electrolyte sufficiently penetrates and the charging/discharging reaction takes place actively. Conceivable. Accumulated acicular lithium or loose lithium flakes come into contact with the positive electrode, causing an internal short circuit and ignition.
本発明はこの課題を解決するためのもので、リチウム二
次電池の安全性の向上を目的とするものである。The present invention is intended to solve this problem, and aims to improve the safety of lithium secondary batteries.
課題を解決するための手段
これらの課題を解決するために本発明は、正極板および
負極板を、セパレータを相互間に介在させて渦巻き状に
巻回して電極体を構成するに当り、周辺部のすべてを面
取りした正極板を用いるものである。Means for Solving the Problems In order to solve these problems, the present invention provides that when forming an electrode body by winding a positive electrode plate and a negative electrode plate in a spiral shape with a separator interposed between them, This uses a positive electrode plate with all sides chamfered.
道り１
本発明により、電池を構成し、充放電を繰り返しても、
電極体の上下部において片状リチウムが遊離せず、内部
短絡および発火を解決することとなる。Path 1 According to the present invention, even if a battery is configured and repeatedly charged and discharged,
Lithium flakes are not released in the upper and lower parts of the electrode body, which solves internal short circuits and ignition.
実施例 以下、本発明の実施例について図面を参照し説明する。Example Embodiments of the present invention will be described below with reference to the drawings.
前述した従来の方法と同方法により電池を組み立てるが
、ここで用いる正極板は第１図（Ｂ）に示すように周辺
部のすべてを面取りしたものである。A battery is assembled by the same method as the conventional method described above, except that the positive electrode plate used here has its entire periphery chamfered as shown in FIG. 1(B).
電池を各々１００個ずつ作製し、７０ｍＡ定電流充放電
を施した。充電時の上限電圧は３．８ｖ１放電時の下限
電圧は２．ＯＶとした。サイクルに伴う内部短絡発生率
および発火発生率の変化を第３図に示した。100 batteries were produced for each battery, and charged and discharged at a constant current of 70 mA. The upper limit voltage during charging is 3.8v1. The lower limit voltage during discharging is 2.8v1. It was set as OV. Figure 3 shows changes in the internal short-circuit incidence rate and the ignition incidence rate as the cycle progresses.
発明の効果
以上のように本発明によれば、正極板および負極板を、
セパレータを相互間に介在させて渦巻き状に巻回した電
極体に、周辺部のすべてを面取りした正極板を用いるこ
とで、電池構成後、充放電を繰り返しても、内部短絡お
よび発火が発生しない。Effects of the Invention As described above, according to the present invention, the positive electrode plate and the negative electrode plate are
By using a positive electrode plate with chamfered edges all around the electrode body, which is spirally wound with a separator interposed between them, internal short circuits and ignition will not occur even after repeated charging and discharging after battery construction. .
ちなみに２００サイクル充放電後、電池を分解し観察し
た結果、従来例の゛場合、電極体の上下部で針状リチウ
ムが堆積し、片状リチウムが遊離しており、これが第３
図に示されるような内部短絡および発火の原因と考えら
れる。一方、本発明の実施例の場合、針状リチウムは堆
積するが、片状リチウムは遊離しない。これは、正極板
の周辺部すべてを面取りすることにより、セパレータか
らの圧迫を受けやすく、空隙が生しないため、電解液は
適度に浸透して充放電反応を規制し、サイクルに伴う片
状リチウムの遊離を防止するためであると考えられる。By the way, after 200 cycles of charging and discharging, the battery was disassembled and observed, and in the case of the conventional example, acicular lithium was deposited at the top and bottom of the electrode body, and flaky lithium was liberated.
This is thought to be the cause of an internal short circuit and fire as shown in the figure. On the other hand, in the case of the embodiment of the present invention, acicular lithium is deposited, but flaky lithium is not liberated. By chamfering all the peripheral parts of the positive electrode plate, it is easily subjected to pressure from the separator and no voids are formed, so the electrolyte penetrates moderately and regulates the charging/discharging reaction. This is thought to be to prevent the release of
なお、負極板を正極板よりも幅広くすると、充放電反応
に関与しないリチウムが電極体の上下部に充放電をくり
返しても残存するため、片状リチウムが遊離しにく（な
り、より一層の効果がある。Note that if the negative electrode plate is made wider than the positive electrode plate, lithium that does not participate in the charge/discharge reaction will remain in the upper and lower parts of the electrode body even after repeated charging and discharging, making it difficult for flaky lithium to be liberated (and making it even more difficult to effective.
第２図は円筒形リチウム二次電池の構成断面図である。FIG. 2 is a cross-sectional view of the configuration of a cylindrical lithium secondary battery.
第３図はサイクルに伴う内部短絡発生率および発火発生
率の変化を示した図である。FIG. 3 is a diagram showing changes in the rate of occurrence of internal short circuits and the rate of firing due to cycles.
１・・・合剤、２・・・芯材、３・・・正極板、４・・
・負極板、５・・・セパレータ。1... Mixture, 2... Core material, 3... Positive electrode plate, 4...
- Negative electrode plate, 5... separator.
代理人の氏名 弁理士 粟野重孝 はか１名菓 図 ３−−一正騒漱 外一 喚黛坂 ター−−せ八°し一層 ｃ−−−ｎミ不会す−ド゛４に ７−−−兵！リードａ １０〜−一上音色表ｔ！Ｊ龜すゾク′ ｔ１−一−靭文相−出張 第 図 充肪Ｊ配立λワル秩（−〕Name of agent: Patent attorney Shigetaka Awano Hakaichimeika figure 3--Kazumasa Soso Sotoichi Kanmayuzaka The first layer c---n I won't see you again--to 4 7---Soldier! lead a 10~-Ichigami tone table t! J Kakusuzoku' t1-1-Tough Bunsou-Business trip No. figure Full fat J arrangement lambda bad chichi (-)
Claims (1)
介在させて渦巻き状に巻回した電極体を備え、上記正極
板３はその周辺部のすべてを面取りしたものであること
を特徴とする非水電解液二次電池。It comprises an electrode body in which a positive electrode plate 3 and a negative electrode plate 4 are spirally wound with a separator 5 interposed therebetween, and the positive electrode plate 3 is characterized in that its entire peripheral portion is chamfered. Nonaqueous electrolyte secondary battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2133430A JPH0428175A (en) | 1990-05-23 | 1990-05-23 | Nonaqueous electrolytic liquid secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2133430A JPH0428175A (en) | 1990-05-23 | 1990-05-23 | Nonaqueous electrolytic liquid secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0428175A true JPH0428175A (en) | 1992-01-30 |
Family
ID=15104592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2133430A Pending JPH0428175A (en) | 1990-05-23 | 1990-05-23 | Nonaqueous electrolytic liquid secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0428175A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000072392A1 (en) * | 1999-05-13 | 2000-11-30 | Moltech Power Systems, Inc. | Notched electrode and method of making same |
| JP2013131342A (en) * | 2011-12-20 | 2013-07-04 | Toyota Motor Corp | Secondary battery and manufacturing method therefor and manufacturing method of negative electrode sheet for use in battery |
| US9048502B2 (en) | 2010-12-13 | 2015-06-02 | Sanyo Electric Co., Ltd. | Lithium secondary battery and method for producing the same |
| JP2015181112A (en) * | 2015-04-21 | 2015-10-15 | トヨタ自動車株式会社 | Secondary battery, manufacturing method thereof, and method for manufacturing negative electrode sheet used for secondary battery |
-
1990
- 1990-05-23 JP JP2133430A patent/JPH0428175A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000072392A1 (en) * | 1999-05-13 | 2000-11-30 | Moltech Power Systems, Inc. | Notched electrode and method of making same |
| US6300002B1 (en) * | 1999-05-13 | 2001-10-09 | Moltech Power Systems, Inc. | Notched electrode and method of making same |
| US9048502B2 (en) | 2010-12-13 | 2015-06-02 | Sanyo Electric Co., Ltd. | Lithium secondary battery and method for producing the same |
| JP2013131342A (en) * | 2011-12-20 | 2013-07-04 | Toyota Motor Corp | Secondary battery and manufacturing method therefor and manufacturing method of negative electrode sheet for use in battery |
| JP2015181112A (en) * | 2015-04-21 | 2015-10-15 | トヨタ自動車株式会社 | Secondary battery, manufacturing method thereof, and method for manufacturing negative electrode sheet used for secondary battery |
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