JP3332783B2 - Lithium ion battery and method for injecting electrolyte in the battery - Google Patents

Lithium ion battery and method for injecting electrolyte in the battery

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Publication number
JP3332783B2
JP3332783B2 JP04421997A JP4421997A JP3332783B2 JP 3332783 B2 JP3332783 B2 JP 3332783B2 JP 04421997 A JP04421997 A JP 04421997A JP 4421997 A JP4421997 A JP 4421997A JP 3332783 B2 JP3332783 B2 JP 3332783B2
Authority
JP
Japan
Prior art keywords
sealing
spacer
electrolyte
sokan
lithium
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.)
Expired - Fee Related
Application number
JP04421997A
Other languages
Japanese (ja)
Other versions
JPH10241741A (en
Inventor
信章 ▲すぎ▼田
康弘 山内
Original Assignee
三洋電機株式会社
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Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Priority to JP04421997A priority Critical patent/JP3332783B2/en
Publication of JPH10241741A publication Critical patent/JPH10241741A/en
Application granted granted Critical
Publication of JP3332783B2 publication Critical patent/JP3332783B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

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

【0001】[0001]

【発明の属する技術分野】本発明はリチウムイオン電池
に係り、特に、この電池へ電解液を注液するための注液
構造および注液方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium ion battery and, more particularly, to a pouring structure and a pouring method for pouring an electrolyte into the battery.

【0002】[0002]

【従来の技術】近年、電子機器の小型化、軽量化はめざ
ましく、それに伴い、電源となる電池に対しても小型軽
量化の要望が非常に大きい。一次電池の分野では既にリ
チウム電池等の小型軽量電池が実用化されているが、こ
れらは一次電池であるが故に繰り返し使用できず、その
用途は限られたものであった。一方、二次電池の分野で
は従来より鉛蓄電池、ニッケル−カドミウム蓄電池、ニ
ッケル−水素蓄電池等が用いられてきたが、これらは小
型軽量化という点で大きな問題点を有している。
2. Description of the Related Art In recent years, there has been a remarkable reduction in the size and weight of electronic devices, and accordingly, there has been a great demand for smaller and lighter batteries that serve as power supplies. In the field of primary batteries, small and lightweight batteries such as lithium batteries have already been put to practical use, but since these are primary batteries, they cannot be used repeatedly, and their uses have been limited. On the other hand, in the field of secondary batteries, lead storage batteries, nickel-cadmium storage batteries, nickel-hydrogen storage batteries, and the like have been conventionally used, but these have major problems in terms of reduction in size and weight.

【0003】そこで、小型軽量でかつ高容量で充放電可
能な電池としてリチウムイオン電池が実用化されるよう
になり、小型ビデオカメラ、携帯電話、ノートパソコン
等の携帯用電子・通信機器等に用いられるようになっ
た。この種のリチウムイオン電池は、負極活物質として
リチウムイオンを吸蔵・脱離し得るカーボン系材料を用
い、正極活物質として、LiCoO2,LiNiO2,L
iMn24,LiFeO2等のリチウム含有遷移金属酸
化物を用い、電解液として有機溶媒に溶質としてリチウ
ム塩を溶解したイオン伝導体を用い、電池として組み立
てた後、初回の充電により正極活物質から出たリチウム
イオンがカーボン粒子内に入って充放電可能となる電池
である。
Therefore, lithium-ion batteries have come into practical use as small, lightweight, high-capacity, chargeable / dischargeable batteries, and are used in portable electronic and communication devices such as small video cameras, mobile phones, and notebook personal computers. Is now available. This type of lithium ion battery uses a carbon-based material capable of inserting and extracting lithium ions as a negative electrode active material, and uses LiCoO 2 , LiNiO 2 , L as a positive electrode active material.
using IMN 2 O 4, LiFeO lithium-containing transition metal oxides such as 2, the ion conductor obtained by dissolving a lithium salt as a solute using an organic solvent as an electrolytic solution, after assembling the battery, the positive electrode active material by the first charging This is a battery in which lithium ions discharged from the battery enter the carbon particles and can be charged and discharged.

【0004】このリチウムイオン電池は、正極活物質お
よび負極活物質をそれぞれ金属製の芯体(箔)に塗布し
て正極板および負極板とし、セパレータを間に入れて巻
回して電極体とする。この電極体を金属製の外装缶内に
挿入した後、封口体により外装缶を封缶する。この後、
封口体に設けられた注液孔より外装缶内に電解液を充填
し、注液孔を封止することにより組み立てられる。
In this lithium ion battery, a positive electrode plate and a negative electrode plate are formed by coating a positive electrode active material and a negative electrode active material on a metal core (foil), respectively, and a separator is interposed therebetween and wound to form an electrode. . After inserting this electrode body into a metal outer can, the outer can is sealed with a sealing body. After this,
The battery pack is assembled by filling the outer can with an electrolyte through a liquid injection hole provided in the sealing body and sealing the liquid injection hole.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、このよ
うなリチウムイオン電池においては、封口体に設けられ
る注液孔は通常1つである。注液孔が1つであると、ポ
ンプ等により電解液を封口体に設けられた注液孔から外
装缶内に送り込んでも、外装缶内の気体の逃げ場がない
ため、電解液が外装缶内に入りにくく、封口体の上に溢
れ出るという問題を生じた。そして、電解液が封口体の
上に溢れ出ると、溢れ出た電解液は析出、粉化し、後に
行う注液孔の封止時の障害になるという問題を生じる。
さらに、溢れ出て析出、粉化した電解液をそのままにし
て、注液孔の封止を行うと、リークの発生の原因になる
という問題も生じる。
However, in such a lithium ion battery, there is usually one liquid injection hole provided in the sealing body. If there is only one injection hole, even if the electrolyte is pumped into the outer can through the injection hole provided in the sealing body, there is no place for gas in the outer can to escape. It was difficult to enter and the problem of overflowing over the sealing body occurred. When the electrolyte overflows onto the sealing body, the overflowed electrolyte is deposited and powdered, which causes a problem that it becomes an obstacle in sealing the injection hole to be performed later.
Furthermore, if the injection hole is sealed while the overflowed, precipitated and powdered electrolyte is left as it is, there is a problem that a leak may occur.

【0006】そこで、本発明は上記問題点に鑑みてなさ
れたものであり、外装缶内へ注液した電解液が溢れない
ような注液構造にするとともに、電解液の注液がスムー
ズに行えるようにすることにある。
Accordingly, the present invention has been made in view of the above problems, and has a liquid injection structure in which the electrolyte injected into the outer can does not overflow, and the electrolyte can be injected smoothly. Is to do so.

【0007】[0007]

【課題を解決するための手段およびその作用・効果】本
発明は、正極板と負極板をセパレータを介して巻回して
形成した電極体を金属製外装缶内に収納した状態にて
前記電極体の上部に同電極体を前記外装缶内にて位置決
保持するスペーサを配置し同スペーサの上方に離間し
て配置される封口体により前記外装缶の開口を封缶して
組み立てられ、前記封口体に設けた少なくとも二つの注
液口の一方から前記外装缶内の気体を排出させるととも
に同封口体に設けた他方の注液口から電解液を前記外装
缶の内部に注入するようにしたリチウムイオン電池であ
って 前記スペーサに前記封口体の各注液口にそれぞれ
対応する連通孔を設けると共にこれら連通孔を隔離する
隔壁を前記封口体の下面まで延出して形成したことを特
徴とするリチウムイオン電池を提供しようとするもので
ある。
Means for Solving the Problems and Action / Effect The present invention relates to a method of winding a positive electrode plate and a negative electrode plate through a separator.
The formed electrostatic polar body in a state housed in the metallic made outer Sokan,
Positioning at the outer Sokan'nai the same electrode material on top of said conductive electrode body
Place a spacer to hold because spaced above the same spacer
By closing the opening of the outer can with a sealing body arranged
Assembled and provided with at least two
The gas in the outer can is discharged from one of the liquid ports.
The electrolyte solution from the other injection port provided in the enclosure
A lithium-ion battery that can be injected into the can
Therefore , each of the liquid inlets of the sealing body is provided on the spacer.
Provide corresponding communication holes and isolate these communication holes
It is characterized in that the partition wall is formed to extend to the lower surface of the sealing body.
To provide lithium-ion batteries
is there.

【0008】上記のリチウムイオン電池におけるよう
に、封口体に少なくとも二つの注液孔を設けるようにす
ると、何れかの注液孔より電解液を注液すると他の注液
孔より外装缶内の気体が排出されるようになるので、気
・液置換がスムーズに行われるようになる。そのため、
外装缶内に存在する気体は容易に排出されるようにな
り、排出された気体に相当する量の電解液がスムーズに
外装缶内に注入されることとなる。したがって、封口体
の上に電解液が溢れ出るという問題を容易に解決できる
ようになり、注液後、直ちに注液孔の封止工程に移るこ
とが可能になるので、この種のリチウムイオン電池の生
産性が向上するとともに歩留まりも向上する。
[0008] As in the lithium ion battery described above, when the set Keru way at least two Note liquid holes in the sealing member, either pouring when injected the electrolytic solution from the hole the other injection hole than the outer can Gas is discharged, so that gas-liquid replacement can be performed smoothly. for that reason,
The gas existing in the outer can can be easily discharged, and the electrolyte solution corresponding to the discharged gas can be smoothly injected into the outer can. Therefore, it is possible to easily solve the problem that the electrolyte overflows onto the sealing body, and it is possible to immediately proceed to the step of sealing the injection hole after the injection. The productivity is improved and the yield is also improved.

【0009】また、スペーサには連通孔間を区画する隔
壁を封口体の下面まで延出して設けているので、電解液
の注入と外装缶内の気体の排出とが別々の注液孔からな
されるようになるので、効率よく気・液置換が行われる
ようになる。
Further, since the spacer is provided with a partition for partitioning between the communication holes extending to the lower surface of the sealing body, the injection of the electrolytic solution and the discharge of the gas in the outer can are performed through separate injection holes. As a result, gas / liquid replacement is performed efficiently.

【0010】また、本発明は、正極板と負極板をセパレ
ータを介して巻回して形成した電極体を金属製外装缶内
に収納した状態にて 前記電極体の上部に同電極体を前
記外装缶内にて位置決め保持するスペーサを配置し、同
スペーサの上方に離間して配置される封口体により前記
外装缶の開口を封缶して組み立てられるリチウムイオン
電池において、前記封口体に設けた少なくとも二つの注
液口のうち一方の注液口と同注液口に対応して前記スペ
ーサに設けた連通孔を通して前記外装缶内の気体を吸引
しながら前記封口体に設けた他方の注液口と同注液口に
対応して前記スペーサに設けた連通孔を通して電解液を
前記外装缶の内部に注入するようにした電解液の注液方
法を実施するものである。
Further, the present invention provides a method for separating a positive electrode plate and a negative electrode plate from each other.
The electrode body formed by winding through a heater is placed inside a metal outer can.
At housed state, the front of the same electrode material on top of the electrode body
Place a spacer for positioning and holding in the outer can.
The above-mentioned sealing body is spaced apart above the spacer.
Lithium ion assembled by sealing the opening of the outer can
In the battery, at least two notes provided on the sealing body
The above-mentioned space corresponds to one of the liquid ports and the same liquid port.
Gas in the outer can through the communication hole
While the other injection port provided on the sealing body and the same injection port
Correspondingly, the electrolyte is passed through the communication hole provided in the spacer.
How to inject the electrolytic solution into the outer can
To implement the law.

【0011】上記注液方法の実施においては、少なくと
も1つの注液孔より排気しながら他の注液孔に電解液を
注液することが可能になる。そのため、外装缶内に存在
する気体は容易に排出されるようになり、排出された気
体に相当する量の電解液がスムーズに外装缶内に注入さ
れることとなる。したがって、封口体の上に電解液が溢
れ出るという問題を容易に解決できるようになり、注液
後、直ちに注液孔の封止工程に移ることが可能になるの
で、この種のリチウムイオン電池の生産性が向上すると
ともに歩留まりも向上する。
[0011] In the practice of the pouring process, it is possible to injected an electrolytic solution other injection hole while evacuating from small crows and <br/> also one injection hole. Therefore, the gas existing in the outer can can be easily discharged, and the electrolytic solution in an amount corresponding to the discharged gas can be smoothly injected into the outer can. Therefore, it is possible to easily solve the problem that the electrolyte overflows onto the sealing body, and it is possible to immediately proceed to the step of sealing the injection hole after the injection. The productivity is improved and the yield is also improved.

【0012】また、スペーサには連通孔間を区画する隔
壁を設けているので、他の注液孔から注入された電解液
が電極体内に含浸される前に、排気している注液孔に挿
入された排気用パイプより直接排出されることが防止で
きるようになる。
Further, since the spacer is provided with a partition for partitioning between the communication holes, the exhausted injection hole is provided before the electrolyte injected from the other injection hole is impregnated into the electrode body. Direct discharge from the inserted exhaust pipe can be prevented.

【0013】[0013]

【発明の実施の形態】以下に、本発明のリチウムイオン
電池の一実施形態を図に基づいて説明する。なお、図1
は本実施形態のリチウムイオン電池の要部を示す図であ
り、図1(a)は外装缶に封口体を取り付けた状態を示
す上面図であり、図1(b)は外装缶に封口体を取り付
ける前の状態を示す上面図であり、図1(c)は図1
(a)のA−A断面を示す断面図であり、図1(d)は
図1(c)のB−B断面を示す断面図であり、図1
(e)は図1(c)のC−C断面を示す断面図である。
また、図2は本実施形態の封口体を示す図であり、図2
(a)は上面図であり、図2(b)は図2(a)のD−
D断面を示す断面図であり、図2(c)は下面図であ
る。さらに、図3は本実施形態のスペーサを示す図であ
り、図3(a)は上面図であり、図3(b)はその側面
図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the lithium ion battery of the present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a view showing a main part of the lithium ion battery of the present embodiment, FIG. 1A is a top view showing a state where a sealing body is attached to an outer can, and FIG. FIG. 1C is a top view showing a state before mounting. FIG.
1A is a cross-sectional view showing an AA cross section, and FIG. 1D is a cross-sectional view showing a BB cross section of FIG.
(E) is a sectional view showing a CC section of FIG. 1 (c).
FIG. 2 is a view showing a sealing body of the present embodiment.
(A) is a top view, and (b) of FIG.
It is sectional drawing which shows D cross section, and FIG.2 (c) is a bottom view. Further, FIG. 3 is a view showing the spacer of the present embodiment, FIG. 3 (a) is a top view, and FIG. 3 (b) is a side view thereof.

【0014】a.電極体の作製 天然黒鉛よりなる負極活物質とポリビニリデンフルオラ
イト(PVDF)よりなる結着剤等とを、N−メチルピ
ロリドンからなる有機溶剤等に溶解したものを混合し
て、スラリーあるいはペーストとする。これらのスラリ
ーあるいはペーストを、スラリーの場合はダイコータ
ー、ドクターブレード等を用いて、ペーストの場合はロ
ーラコーティング法等により金属芯体(例えば、銅箔)
の両面の全面にわたって均一に塗布して、活物質層を塗
布した負極板を形成する。
A. Preparation of Electrode Body A mixture of a negative electrode active material made of natural graphite and a binder made of polyvinylidenefluoride (PVDF) dissolved in an organic solvent made of N-methylpyrrolidone and the like is mixed with a slurry or paste. I do. These slurries or pastes are prepared by using a die coater, a doctor blade or the like in the case of a slurry, or a metal core (for example, copper foil) by a roller coating method or the like in the case of a paste.
To form a negative electrode plate coated with an active material layer.

【0015】この後、活物質層を塗布した負極板を乾燥
機中を通過させて、スラリーあるいはペースト作製に必
要であった有機溶剤を除去して乾燥させる。この乾燥負
極板をロールプレス機により圧延して負極板とする。
Thereafter, the negative electrode plate coated with the active material layer is passed through a drier to remove an organic solvent necessary for preparing a slurry or a paste, followed by drying. The dried negative electrode plate is rolled by a roll press to form a negative electrode plate.

【0016】一方、LiCoO2からなる正極活物質
と、アセチレンブラック、グラファイト等の炭素系導電
剤と、ポリビニリデンフルオライト(PVDF)よりな
る結着剤等とを、N−メチルピロリドンからなる有機溶
剤等に溶解したものを混合して、スラリーあるいはペー
ストとする。なお、スラリーあるいはペースト中にポリ
エチレンオキシド、ポリアクリロニトリル、セルロース
等の添加剤を添加してもよい。
On the other hand, a positive electrode active material composed of LiCoO 2 , a carbon-based conductive agent such as acetylene black and graphite, a binder composed of polyvinylidene fluorite (PVDF), and the like are combined with an organic solvent composed of N-methylpyrrolidone. Are mixed to form a slurry or paste. Note that additives such as polyethylene oxide, polyacrylonitrile, and cellulose may be added to the slurry or paste.

【0017】これらのスラリーあるいはペーストを、ス
ラリーの場合はダイコーター、ドクターブレード等を用
いて、ペーストの場合はローラコーティング法等により
金属芯体(例えば、アルミニウム箔)の両面に均一に塗
布して、活物質層を塗布した正極板を形成する。
These slurries or pastes are uniformly applied to both surfaces of a metal core (for example, aluminum foil) by using a die coater, a doctor blade or the like in the case of a slurry, or by a roller coating method in the case of a paste. Then, a positive electrode plate coated with the active material layer is formed.

【0018】この後、活物質層を塗布した正極板を乾燥
機中を通過させて、スラリーあるいはペースト作製に必
要であった有機溶剤を除去して乾燥させる。乾燥後、こ
の乾燥正極板をロールプレス機により圧延して正極板と
する。
Thereafter, the positive electrode plate coated with the active material layer is passed through a drier to remove an organic solvent necessary for preparing a slurry or a paste, followed by drying. After drying, the dried positive electrode plate is rolled by a roll press to obtain a positive electrode plate.

【0019】上述のようにして作製した負極板と正極板
とを、有機溶媒との反応性が低く、かつ安価なポリオレ
フィン系樹脂からなる微多孔膜、好適にはポリエチレン
製微多孔膜を間にして重ね合わせ、図示しない巻き取り
機により卷回する。この後、最外周をテープ止めして渦
巻状電極体とした後、プレス機で角形外装缶に挿入でき
るような形に成形して電極体とする。
A negative electrode plate and a positive electrode plate prepared as described above are sandwiched between a microporous film made of an inexpensive polyolefin-based resin having low reactivity with an organic solvent, preferably a polyethylene microporous film. And wound by a winder (not shown). Thereafter, the outermost periphery is taped to form a spiral electrode body, and then formed into a shape that can be inserted into a rectangular outer can with a press machine to obtain an electrode body.

【0020】b.リチウムイオン電池の作製 ついで、1枚板からプレス加工により成形したアルミニ
ウム合金製の有底筒状の角形外装缶(例えば、外形寸法
が、高さ46mm、幅22mm、厚み7.5mm、肉厚
0.5mmのもの)10の開口部より、上述のようにし
て作製した電極体を外装缶10内に挿入する。なお、こ
の外装缶10は正極端子を兼ねている。
B. Production of Lithium-ion Battery Then, a bottomed cylindrical prismatic outer can made of an aluminum alloy formed by pressing from one sheet (for example, the outer dimensions are 46 mm in height, 22 mm in width, 7.5 mm in thickness, and 0 mm in thickness) The electrode body manufactured as described above is inserted into the outer can 10 through the opening of (0.5 mm). The outer can 10 also functions as a positive electrode terminal.

【0021】電極体を外装缶10内に挿入した後、電極
体の上部にスペーサ20を載置する。ここで、スペーサ
20は、外装缶10内に挿入した電極体が移動しないよ
うに保持するために設けるものであって、図1、図3に
示すように、その中央部に上部に延出する隔壁25を配
設するとともに、この隔壁25の左側に第1の注液用連
通孔21と正極導電タブ用貫通孔23を配設し、その右
側に第2の注液用連通孔22と負極導電タブ用貫通孔2
4を配設している。なお、隔壁25は後述する封口体3
0の下面まで延出するように形成されている。
After the electrode body is inserted into the outer can 10, a spacer 20 is placed on the upper part of the electrode body. Here, the spacer 20 is provided for holding the electrode body inserted into the outer can 10 so as not to move, and extends upward at the center portion thereof as shown in FIGS. 1 and 3. A partition wall 25 is disposed, a first liquid injection communication hole 21 and a positive electrode conductive tab through hole 23 are disposed on the left side of the partition wall 25, and a second liquid injection communication hole 22 and a negative electrode Through hole 2 for conductive tab
4 are arranged. In addition, the partition 25 is a sealing body 3 described later.
0 is formed to extend to the lower surface.

【0022】なお、このスペーサ20を電極体の上部に
載置するに際しては、電極体の正極より延出する正極導
電タブ40を正極導電タブ用貫通孔23に通して、正極
導電タブ40をスペーサ20より上部に突出させるとと
もに、電極体の負極より延出する負極導電タブ50を負
極導電タブ貫通孔24に通して、負極導電タブ50をス
ペーサ20より上部に突出させる。
When the spacer 20 is mounted on the upper part of the electrode body, the positive electrode conductive tab 40 extending from the positive electrode of the electrode body is passed through the positive electrode conductive tab through hole 23 so that the positive electrode conductive tab 40 is The negative electrode conductive tab 50 protrudes above the spacer 20 while passing the negative electrode conductive tab 50 extending from the negative electrode of the electrode body through the negative electrode conductive tab through hole 24.

【0023】この後、外装缶10に溶接された正極集電
リード板41と正極導電タブ40とを溶接するととも
に、後述する封口体30の端子孔33に取り付けられた
負極端子52に固着された負極集電リード板51と負極
導電タブ50とを溶接する。ついで、外装缶10の開口
部に、封口体30を載置した後、封口体30の周囲と外
装缶10とを溶接する。
Thereafter, the positive electrode current collecting lead plate 41 welded to the outer can 10 and the positive electrode conductive tab 40 are welded and fixed to a negative electrode terminal 52 attached to a terminal hole 33 of the sealing body 30 described later. The negative electrode current collecting lead plate 51 and the negative electrode conductive tab 50 are welded. Next, after placing the sealing body 30 in the opening of the outer can 10, the periphery of the sealing body 30 and the outer can 10 are welded.

【0024】ここで、封口体30は、外装缶10の開口
を封缶するために設けるものであって、図1、図2に示
すように、その中央部のスペーサ20の隔壁25に対向
する位置の左側に第1の注液孔31を配設し、スペーサ
20の隔壁25に対向する位置の右側に第2の注液孔3
2と負極端子用貫通孔33を配設している。そして、こ
の封口体30の上部の周辺部には封口体30の上面より
突出する周囲壁34を配設している。
Here, the sealing body 30 is provided for sealing the opening of the outer can 10, and faces the partition wall 25 of the spacer 20 at the center as shown in FIGS. A first liquid injection hole 31 is provided on the left side of the position, and a second liquid injection hole 3 is provided on the right side of the position facing the partition 25 of the spacer 20.
2 and a through hole 33 for the negative electrode terminal. A peripheral wall 34 protruding from the upper surface of the sealing body 30 is provided around the upper part of the sealing body 30.

【0025】外装缶10の開口部に封口体30を載置し
てその周囲を外装缶に溶接して封口した後、第1の注液
孔31内にエチレンカーボネート(EC)30重量部と
ジエチルカーボネート(DEC)70重量部よりなる混
合溶媒に電解質塩として1MLiPF6を添加した電解
液を注入する。このとき、図示しない吸気装置より延出
するパイプを第2の注液孔32内に挿入して外装缶10
内の気体を吸気しながら電解液を第1の注液孔31内に
注入する。電解液の注液後、各注液孔31,32を封止
し、ついで、所定の充電処理を施して本実施形態のリチ
ウムイオン電池とする。
After the sealing body 30 is placed on the opening of the outer can 10 and the periphery thereof is welded to the outer can and sealed, 30 parts by weight of ethylene carbonate (EC) and diethyl An electrolyte obtained by adding 1M LiPF6 as an electrolyte salt to a mixed solvent composed of 70 parts by weight of carbonate (DEC) is injected. At this time, a pipe extending from a suction device (not shown) is inserted into the second liquid injection hole 32 to insert the outer can 10.
The electrolytic solution is injected into the first injection hole 31 while the gas inside is sucked. After the electrolyte is injected, the injection holes 31 and 32 are sealed, and then a predetermined charging process is performed to obtain a lithium ion battery of the present embodiment.

【0026】なお、電解液としては、有機溶媒に溶質と
してリチウム塩を溶解したイオン伝導体であって、イオ
ン伝導率が高く、正・負の各電極に対して化学的、電気
化学的に安定で、使用可能温度範囲が広くかつ安全性が
高く、安価なものを使用する。例えば、有機溶媒として
は上記エチレンカーボネート(EC)とジエチルカーボ
ネート(DEC)との混合溶媒以外に、プロピレンカー
ボネート(PC)、スルフォラン(SL)、テトラハイ
ドロフラン(THF)、γブチロラクトン(GBL)、
ジメチルカーボネート(DMC)、エチルメチルカーボ
ネート(EMC)、1,2ジメトキシエタン(DME)
等あるいはこれらの混合溶媒が好適である。また、溶質
としては電子吸引性の強いリチウム塩を使用し、上記L
iPF6以外に例えば、LiBF4、LiClO4、L
iAsF6、LiCF3SO3、Li(CF3SO2)
2N、LiC4F9SO3等が好適である。
The electrolyte is an ionic conductor in which a lithium salt is dissolved as a solute in an organic solvent and has a high ionic conductivity and is chemically and electrochemically stable with respect to each of the positive and negative electrodes. Therefore, use an inexpensive one that has a wide usable temperature range, high safety, and low cost. For example, as the organic solvent, in addition to the above-mentioned mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC), propylene carbonate (PC), sulfolane (SL), tetrahydrofuran (THF), γ-butyrolactone (GBL),
Dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), 1,2 dimethoxyethane (DME)
Or a mixed solvent thereof is suitable. As the solute, a lithium salt having a strong electron-withdrawing property is used.
In addition to iPF6, for example, LiBF4, LiClO4, L
iAsF6, LiCF3SO3, Li (CF3SO2)
2N, LiC4F9SO3 and the like are preferred.

【0027】c.実験結果 上述のように作製した本実施形態のリチウムイオン電池
と、従来の方法により作製された注液孔が1つのみの比
較例の電池をそれぞれ10,000個ずつ用いて注液実
験を行い、これらの分注回数と封缶の不良率をそれぞれ
求めると下記の表1に示すような結果が得られた。な
お、分注回数とは、所定量の電解液を1回の注液のみで
外装缶10内に注入しようとすると、注液孔31あるい
は32より溢れるため、何回かに分割して注液する回数
を意味する。
C. Experimental Results An injection experiment was performed using the lithium ion battery of the present embodiment manufactured as described above and the battery of the comparative example having only one injection hole manufactured by the conventional method, using 10,000 each. When the number of times of dispensing and the defective rate of the sealed can were obtained, the results shown in Table 1 below were obtained. The number of times of dispensing means that if a predetermined amount of electrolyte is to be injected into the outer can 10 with only one injection, the electrolyte overflows from the injection hole 31 or 32 and is divided into several times. Means the number of times

【0028】[0028]

【表1】 [Table 1]

【0029】上記表1より明らかなように、本発明のリ
チウムイオン電池においては、分注回数が少なくなると
ともに、封缶不良率も格段に減少している。分注回数が
減少するのは、吸気装置より延出するパイプを第2の注
液孔32内に挿入して外装缶10内の気体を吸気しなが
ら電解液を第1の注液孔31内に注入するため、排出さ
れた気体に相当する量の電解液がスムーズに外装缶10
内に注入されるようになって、1度に注入できる電解液
量が増加したためである。
As is evident from Table 1, in the lithium ion battery of the present invention, the number of dispensing operations is reduced, and the defective rate of sealed cans is significantly reduced. The reason why the number of dispensing is reduced is that the pipe extending from the suction device is inserted into the second liquid injection hole 32 and the electrolyte is drawn into the first liquid injection hole 31 while the gas in the outer can 10 is sucked. Into the outer can 10 in an amount equivalent to the discharged gas.
This is because the amount of electrolytic solution that can be injected at one time has been increased.

【0030】また、封缶不良率が減少するのは、1度に
注入できる電解液量が増加すると、封口体の上に電解液
が溢れ出ることが防止でき、したがって、溢れ出た電解
液が析出、粉化するということがなくなり、注液孔の封
止時に障害が生じなくなるためである。
Further, the reduction in the rate of defective cans can be prevented by increasing the amount of electrolyte that can be injected at one time, thereby preventing the electrolyte from overflowing onto the sealing body. This is because precipitation and powdering do not occur, and no trouble occurs when the injection hole is sealed.

【0031】上述したように、本実施形態においては、
封口体30に第1注液孔31と第2注液孔32とを設
け、第2の注液孔32より外装缶10内の気体を吸気し
ながら電解液を第1の注液孔31内に注入するため、排
出された気体に相当する量の電解液がスムーズに外装缶
10内に注入できるようになる。したがって、封口体の
上に電解液が溢れ出るという問題を容易に解決できるよ
うになり、注液後、直ちに注液孔の封止工程に移ること
が可能になるので、この種のリチウムイオン電池の生産
性が向上するとともに歩留まりも向上する。
As described above, in this embodiment,
A first liquid injection hole 31 and a second liquid injection hole 32 are provided in the sealing body 30, and the electrolyte is supplied into the first liquid injection hole 31 while the gas in the outer can 10 is sucked through the second liquid injection hole 32. Therefore, an amount of electrolyte solution corresponding to the discharged gas can be smoothly injected into the outer can 10. Therefore, it is possible to easily solve the problem that the electrolyte overflows onto the sealing body, and it is possible to immediately proceed to the step of sealing the injection hole after the injection. The productivity is improved and the yield is also improved.

【0032】また、スペーサ20に封口体20の下面ま
で延出する隔壁25を設けているので、第1の注液孔3
1からに注入された電解液が電極体内に含浸される前に
第2注液孔32に挿入された排気用パイプより直接排出
されることが防止できるようになる。
Further, since the spacer 20 is provided with the partition wall 25 extending to the lower surface of the sealing body 20, the first liquid injection hole 3 is formed.
It is possible to prevent the electrolyte injected from 1 from being directly discharged from the exhaust pipe inserted into the second injection hole 32 before being impregnated into the electrode body.

【0033】なお、上述の実施形態においては、負極活
物質として天然黒鉛を用いる例について説明したが、天
然黒鉛以外に、リチウムイオンを吸蔵・脱離し得るカー
ボン系材料、例えば、グラファイト、カーボンブラッ
ク、コークス、ガラス状炭素、炭素繊維、またはこれら
の焼成体等が好適である。また、酸化錫、酸化チタン等
のリチウムイオンを吸蔵・脱離し得る酸化物を用いても
よい。
In the above embodiment, an example in which natural graphite is used as the negative electrode active material has been described. In addition to natural graphite, a carbon-based material capable of inserting and extracting lithium ions, for example, graphite, carbon black, Coke, glassy carbon, carbon fiber, or a fired body of these are suitable. Further, an oxide such as tin oxide or titanium oxide capable of inserting and extracting lithium ions may be used.

【0034】また、上述の実施形態においては、正極活
物質としてLiCoO2を用いる例について説明した
が、LiCoO2以外に、リチウムイオンをゲストとし
て受け入れ得るリチウム含有遷移金属化合物、例えば、
LiNiO2、LiCoXNi(1−X)O2、LiCr
2、LiVO2、LiMnO2、αLiFeO2、LiT
iO2、LiScO2、LiYO2、LiMn24等が好
ましいが、特に、LiNiO2、LiCoXNi(1−
X)O2を単独で用いるかあるいはこれらの二種以上を
混合して用いるのが好適である。また、ポリアセチレ
ン、ポリアニリン等の導電性ポリマーを用いてもよい。
In the above-described embodiment, an example in which LiCoO 2 is used as the positive electrode active material has been described. In addition to LiCoO 2 , a lithium-containing transition metal compound capable of accepting lithium ions as a guest, for example,
LiNiO 2 , LiCoXNi (1-X) O 2 , LiCr
O 2 , LiVO 2 , LiMnO 2 , αLiFeO 2 , LiT
iO 2 , LiScO 2 , LiYO 2 , LiMn 2 O 4 and the like are preferable, and particularly, LiNiO 2 , LiCoXNi (1-
X) or whether to use the O 2 alone is used as a mixture of two or more thereof are preferred. Further, a conductive polymer such as polyacetylene or polyaniline may be used.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明の一実施形態のリチウムイオン電池の
要部を示す図であり、図1(a)は外装缶に封口体を取
り付けた状態を示す上面図であり、図1(b)は外装缶
に封口体を取り付ける前の状態を示す上面図であり、図
1(c)は図1(a)のA−A断面を示す断面図であ
り、図1(d)は図1(c)のB−B断面を示す断面図
であり、図1(e)は図1(c)のC−C断面を示す断
面図である。
FIG. 1 is a view showing a main part of a lithium ion battery according to one embodiment of the present invention, and FIG. 1 (a) is a top view showing a state where a sealing body is attached to an outer can, and FIG. 1 (b). FIG. 1C is a top view showing a state before the sealing body is attached to the outer can, FIG. 1C is a cross-sectional view taken along the line AA of FIG. 1A, and FIG. 1C is a cross-sectional view showing a BB cross section, and FIG. 1E is a cross-sectional view showing a CC cross section of FIG. 1C.

【図2】 図1の封口体を示す図であり、図2(a)は
上面図であり、図2(b)は図2(a)のD−D断面を
示す断面図であり、図2(c)は下面図である。
FIG. 2 is a view showing the sealing body of FIG. 1, FIG. 2 (a) is a top view, and FIG. 2 (b) is a cross-sectional view showing a DD section of FIG. 2 (a); 2 (c) is a bottom view.

【図3】 図1のスペーサを示す図であり、図3(a)
は上面図であり、図3(b)はその側面図である。
FIG. 3 is a view showing the spacer of FIG. 1, and FIG.
Is a top view, and FIG. 3B is a side view thereof.

【符号の説明】[Explanation of symbols]

10…外装缶(正極端子)、20…スペーサ、21…第
1の注液用連通孔、22…第2の注液用連通孔、23…
正極導電タブ用貫通孔、24…負極導電タブ用貫通孔、
25…隔壁、30…封口体、31…第1の注液孔、32
…第2の注液孔、33…負極端子用貫通孔、40…正極
導電タブ、41…正極集電リード板、50…負極導電タ
ブ、51…負極集電リード板、52…負極端子
Reference Signs List 10: outer can (positive electrode terminal), 20: spacer, 21: first communication hole for liquid injection, 22: second communication hole for liquid injection, 23 ...
Through hole for positive electrode conductive tab, 24 ... Through hole for negative electrode conductive tab,
25 ... partition wall, 30 ... sealing body, 31 ... first liquid injection hole, 32
... Second liquid injection hole, 33 ... Negative electrode terminal through hole, 40 ... Positive electrode conductive tab, 41 ... Positive electrode current collecting lead plate, 50 ... Negative electrode conductive tab, 51 ... Negative electrode current collecting lead plate, 52 ... Negative electrode terminal

フロントページの続き (58)調査した分野(Int.Cl.7,DB名) H01M 10/40 H01M 2/02 - 2/08 H01M 2/36 H01M 6/16 - 6/18 Continued on the front page (58) Fields surveyed (Int.Cl. 7 , DB name) H01M 10/40 H01M 2/02-2/08 H01M 2/36 H01M 6/16-6/18

Claims (2)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】 正極板と負極板をセパレータを介して巻
    回して形成した電極体を金属外装缶内に収納した状態
    にて 前記電極体の上部に同電極体を前記外装缶内にて
    位置決め保持するスペーサを配置し同スペーサの上方に
    離間して配置される封口体により前記外装缶の開口を封
    して組み立てられ、前記封口体に設けた少なくとも二
    つの注液口の一方から前記外装缶内の気体を排出させる
    とともに同封口体に設けた他方の注液口から電解液を前
    記外装缶の内部に注入するようにしたリチウムイオン電
    池であって、 前記スペーサに前記封口体の各注液口にそれぞれ対応す
    る連通孔を設けると共にこれら連通孔を隔離する隔壁を
    前記封口体の下面まで延出して形成したことを特徴とす
    るリチウムイオン電池。
    1. A state in which a positive electrode plate and the negative electrode plate polar body collector formed by winding via a separator is accommodated in a metal outer can
    At the upper to the same electrode of the electrostatic polar body in in the outer Sokan
    Above the place spacers for positioning hold Dosu pacer
    Assembled in sealing the opening of said outer Sokan with a sealing member to be disposed apart from at least provided on the sealing body two
    The gas in the outer can is discharged from one of the two inlets
    Together with the electrolyte from the other inlet provided in the enclosure.
    A lithium-ion battery which is adapted to inject into the interior of Kigaiso cans, to correspond to each liquid inlet of said sealing member to said spacer
    Lithium-ion batteries the partition you isolate these communication holes provided with a communication hole, characterized in that formed extending to a lower surface of the sealing body that.
  2. 【請求項2】 正極板と負極板をセパレータを介して巻
    回して形成した電極体を金属製外装缶内に収納した状態
    にて 前記電極体の上部に同電極体を前記外装缶内にて
    位置決め保持するスペーサを配置し、同スペーサの上方
    に離間して配置される封口体により前記外装缶の開口を
    封缶して組み立てられるリチウムイオン電池において、 前記封口体に設けた少なくとも二つの注液口のうち一方
    の注液口と同注液口に対応して前記スペーサに設けた連
    通孔を通して前記外装缶内の気体を吸引しながら前記封
    口体に設けた他方の注液口と同注液口に対応して前記ス
    ペーサに設けた連通孔を通して電解液を前記外装缶の内
    部に注入するようにした電解液の 注液方法。
    2. A state in which a positive electrode plate and the negative electrode plate polar body collector formed by winding via a separator is accommodated in a metallic made outer Sokan
    At the upper to the same electrode of the electrostatic polar body in in the outer Sokan
    A spacer for positioning retain arranged, above the same scan pacer
    In the lithium-ion batteries which is assembled by sealing the opening of said outer Sokan with a sealing member to be arranged separately, one of the at least two liquid injection port provided on the sealing body
    Of the spacer corresponding to the liquid inlet of
    The above-mentioned sealing is performed while sucking the gas in the outer can through the through hole.
    The above-mentioned switch corresponds to the other liquid inlet provided in the mouth and the same liquid inlet.
    The electrolyte solution is passed through the communication hole provided in the pacer to the inside of the outer can.
    A method for injecting an electrolytic solution to be injected into the part .
JP04421997A 1997-02-27 1997-02-27 Lithium ion battery and method for injecting electrolyte in the battery Expired - Fee Related JP3332783B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04421997A JP3332783B2 (en) 1997-02-27 1997-02-27 Lithium ion battery and method for injecting electrolyte in the battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04421997A JP3332783B2 (en) 1997-02-27 1997-02-27 Lithium ion battery and method for injecting electrolyte in the battery

Publications (2)

Publication Number Publication Date
JPH10241741A JPH10241741A (en) 1998-09-11
JP3332783B2 true JP3332783B2 (en) 2002-10-07

Family

ID=12685444

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3332783B2 (en)

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