JP2003036891A - Charge method and discharge method for nonaqueous electrolyte secondary battery and apparatus for the same - Google Patents
Charge method and discharge method for nonaqueous electrolyte secondary battery and apparatus for the sameInfo
- Publication number
- JP2003036891A JP2003036891A JP2001222457A JP2001222457A JP2003036891A JP 2003036891 A JP2003036891 A JP 2003036891A JP 2001222457 A JP2001222457 A JP 2001222457A JP 2001222457 A JP2001222457 A JP 2001222457A JP 2003036891 A JP2003036891 A JP 2003036891A
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- Prior art keywords
- battery
- secondary battery
- electrolyte secondary
- discharging
- voltage
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Classifications
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- 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
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、非水電解質二次電
池の使用に伴い減少した放電容量を回復させる非水電解
質二次電池の放電方法、充電方法とその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharging method, a charging method and a device for a non-aqueous electrolyte secondary battery, which recovers a discharge capacity reduced with the use of the non-aqueous electrolyte secondary battery.
【０００２】[0002]
【従来の技術】非水電解質二次電池の電極の構成例を図
４に模式的に示す。この非水電解質二次電池の電極は、
正極１と負極２とからなり、これらの正極１と負極２
は、図示しないセパレータ等を介して対向して配置され
ている。正極１は、アルミニウム箔等の表面にコバルト
酸リチウム（ＬｉＣｏＯ2 ）等の正極活物質を含む合材
を担持させたものであり、負極２は、銅箔等の表面に黒
鉛等の負極活物質を含む合材を担持させたものである。
また、これらの正極１と負極２の間には、非水電解質が
介在される。2. Description of the Related Art FIG. 4 schematically shows a constitutional example of electrodes of a non-aqueous electrolyte secondary battery. The electrodes of this non-aqueous electrolyte secondary battery are
It consists of a positive electrode 1 and a negative electrode 2, and these positive electrode 1 and negative electrode 2
Are arranged so as to face each other with a separator or the like not shown in between. The positive electrode 1 is a composite material containing a positive electrode active material such as lithium cobalt oxide (LiCoO 2 ) supported on the surface of an aluminum foil or the like, and the negative electrode 2 is a negative electrode active material such as graphite on the surface of a copper foil or the like. It carries a mixture containing
A non-aqueous electrolyte is interposed between the positive electrode 1 and the negative electrode 2.
【０００３】上記構成の非水電解質二次電池に充電を行
うと、図４（ａ）に示すように、正極１のコバルト酸リ
チウム等に吸蔵されていたリチウムイオン（ドットハッ
チングで示す。以下同じ）が放出されて、非水電解質を
介し、図４（ｂ）に示すように、負極２の黒鉛等に吸蔵
されるようになる。また、放電時には、負極２の黒鉛等
からリチウムイオンが放出され、非水電解質を介して、
図４（ａ）に示すように、正極１のコバルト酸リチウム
等に吸蔵されるようになる。そして、このようにリチウ
ムイオンが正極１と負極２との間で移動することにより
充放電を繰り返すことができる。When the non-aqueous electrolyte secondary battery having the above structure is charged, as shown in FIG. 4 (a), lithium ions stored in lithium cobalt oxide or the like of the positive electrode 1 (shown by dot hatching. The same applies hereinafter. 4) is released and is occluded in the graphite or the like of the negative electrode 2 through the non-aqueous electrolyte as shown in FIG. 4 (b). Further, during discharge, lithium ions are released from the graphite or the like of the negative electrode 2, and the lithium ions are discharged through the non-aqueous electrolyte.
As shown in FIG. 4A, the positive electrode 1 is occluded in lithium cobalt oxide or the like. Then, by moving the lithium ions between the positive electrode 1 and the negative electrode 2 in this manner, charging and discharging can be repeated.
【０００４】ところで、上記非水電解質二次電池は、負
極２の面積が正極１よりも広く形成されるのが一般的で
ある。これは、もし正極１の面積の方が広い場合に、こ
の正極１における負極２と対向していない部分から移動
して来たリチウムイオンが負極２の端部に集中するの
で、この負極２のリチウムイオン吸蔵能力を超えてリチ
ウムデンドライトとして析出するおそれがあるからであ
る。このようなリチウムデンドライトが析出すると、負
極２の表面から金属リチウムが樹枝状に成長して正極１
に達し内部短絡を生じるおそれがある。By the way, in the non-aqueous electrolyte secondary battery, the area of the negative electrode 2 is generally larger than that of the positive electrode 1. This is because if the area of the positive electrode 1 is wider, the lithium ions that have moved from the portion of the positive electrode 1 that does not face the negative electrode 2 concentrate at the end of the negative electrode 2, This is because the lithium dendrite may be deposited in excess of the lithium ion storage capacity. When such lithium dendrite deposits, metallic lithium grows in a dendritic manner from the surface of the negative electrode 2 and the positive electrode 1
There is a risk that the internal short circuit will occur.
【０００５】正極１と負極２を積層して積層型の発電要
素を構成する場合には、図４に模式的に示したように、
正極１よりも少し面積の広い負極２を用いる。また、正
極１と負極２を巻回して巻回型の発電要素を構成する場
合には、正極１よりも少し幅広の負極２を巻き初めや巻
き終わりの部分でこの正極１よりも１回以上余分に巻回
するようにしている。When a positive electrode 1 and a negative electrode 2 are laminated to form a laminated power generating element, as shown schematically in FIG.
The negative electrode 2 having a slightly larger area than the positive electrode 1 is used. When the positive electrode 1 and the negative electrode 2 are wound to form a winding type power generation element, the negative electrode 2 which is slightly wider than the positive electrode 1 is wound once or more than the positive electrode 1 at the beginning and end of winding. I try to wind it extra.
【０００６】[0006]
【発明が解決しようとする課題】ところが、上記非水電
解質二次電池は、図４（ｂ）に示す充電状態で放置する
と、負極２における正極１との対向部分２ａに吸蔵され
たリチウムイオンが固相内拡散によって、図４（ｃ）に
示すように、負極２における正極１とは対向しない非対
向部分２ｂを含む全体に均一に広がるようになる。しか
しながら、このような非水電解質二次電池を放電する
と、負極２の非対向部分２ｂにまで広がったリチウムイ
オンが、正極１に対向していないために、この正極１に
は移動せず、図４（ｄ）に示すように、負極２の非対向
部分２ｂに残留したままになる。However, when the above non-aqueous electrolyte secondary battery is left in the charged state shown in FIG. 4 (b), the lithium ions occluded in the portion 2a of the negative electrode 2 facing the positive electrode 1 are discharged. By diffusion in the solid phase, as shown in FIG. 4 (c), the negative electrode 2 is uniformly spread over the entire portion including the non-facing portion 2b that does not face the positive electrode 1. However, when such a non-aqueous electrolyte secondary battery is discharged, the lithium ions that have spread to the non-facing portion 2b of the negative electrode 2 do not move to the positive electrode 1 because they do not face the positive electrode 1, and As shown in FIG. 4 (d), it remains in the non-facing portion 2b of the negative electrode 2.
【０００７】このため、従来の非水電解質二次電池は、
負極２の非対向部分２ｂに充放電に関与しなくなったリ
チウムイオンが溜まって来るために、使用に伴って放電
容量が減少するという問題が生じていた。Therefore, the conventional non-aqueous electrolyte secondary battery is
Lithium ions, which are no longer involved in charging and discharging, are accumulated in the non-opposing portion 2b of the negative electrode 2, which causes a problem that the discharge capacity decreases with use.
【０００８】非水電解質二次電池は、水溶液電解質二次
電池に比べて、メモリ効果が存在しないという利点を有
する。しかしながら、このような非水電解質二次電池で
も、低率で放電を行ったり、充放電を何度も繰り返す
と、放電容量が徐々に減少するという現象が生じる。そ
して、この放電容量の減少は、電極の不可逆な劣化によ
るものもあるが、上記のように負極２の非対向部分２ｂ
に溜まったリチウムイオンが放電によって正極１に戻ら
ないようになることが原因である場合も多い。The non-aqueous electrolyte secondary battery has an advantage over the aqueous electrolyte secondary battery in that it has no memory effect. However, even in such a non-aqueous electrolyte secondary battery, when discharging at a low rate or repeating charging / discharging many times, the discharge capacity gradually decreases. The decrease in discharge capacity may be due to the irreversible deterioration of the electrode, but as described above, the non-opposing portion 2b of the negative electrode 2 is not affected.
In many cases, the cause is that the lithium ions accumulated in the positive electrode 1 will not return to the positive electrode 1 due to discharge.
【０００９】また、巻回型の発電要素を用いる非水電解
質二次電池では、巻回の巻き初めや巻き終わりの部分
で、負極２を正極１よりも１回以上余分に巻回している
ので、この負極２の余分に巻回した部分が広い非対向部
分２ｂとなり、放電容量の減少が特に大きくなってい
た。Further, in the non-aqueous electrolyte secondary battery using the winding type power generating element, the negative electrode 2 is wound one or more times more than the positive electrode 1 at the beginning and end of the winding. The extra wound portion of the negative electrode 2 becomes a wide non-opposing portion 2b, and the reduction in discharge capacity is particularly large.
【００１０】本発明は、かかる事情に対処するためにな
されたものであり、電池の放電と放置を繰り返すことに
より、見かけ上減少していた放電容量を回復させること
ができる非水電解質二次電池の放電方法、充電方法とそ
の装置を提供することを目的としている。The present invention has been made to cope with such a circumstance, and a non-aqueous electrolyte secondary battery capable of recovering an apparently reduced discharge capacity by repeatedly discharging and leaving the battery. It is an object of the present invention to provide a discharging method, a charging method and a device therefor.
【００１１】[0011]
【課題を解決するための手段】請求項１の非水電解質二
次電池の放電方法は、電池の放電を行う放電工程と、こ
の放電工程により放電を行った電池を所定時間放置する
放置工程と、この放置工程により放置した後の電池の開
路電圧を検出する開路電圧検出工程とを、この開路電圧
検出工程により検出された電池の開路電圧が所定電圧以
下となるまで繰り返すことを特徴とする。According to a first aspect of the present invention, there is provided a discharging method for a non-aqueous electrolyte secondary battery, comprising a discharging step of discharging the battery, and a leaving step of leaving the battery discharged by the discharging step for a predetermined time. The open circuit voltage detecting step of detecting the open circuit voltage of the battery after being left in this leaving step is repeated until the open circuit voltage of the battery detected by the open circuit voltage detecting step becomes equal to or lower than a predetermined voltage.
【００１２】請求項１の発明によれば、放電工程により
電池の放電を行うと、負極における正極との対向部分に
存在するリチウム等のアルカリ金属又はアルカリ金属イ
オン（以下、「リチウムイオン等」という）が正極に移
動し、放置工程によりこの電池を放置すると、負極にお
ける正極とは対向していない非対向部分に残留したリチ
ウムイオン等が対向部分を含む全体に拡散する。そこ
で、この電池を再度放電工程により放電すると、負極の
対向部分に拡散したリチウムイオン等が正極に移動し、
再度放置工程によりこの電池を放置すると、負極の非対
向部分に先の拡散でも残留したリチウムイオン等が再び
対向部分を含む全体に拡散する。そして、この放電工程
と放置工程を繰り返すことにより、負極に残留するリチ
ウムイオン等が拡散と正極への移動を繰り返し徐々に減
少するようになる。また、放置工程によってリチウムイ
オン等が負極全体に拡散した後に開路電圧を測定する
と、この負極に残留したリチウムイオン等の量に応じた
電圧を検出することができるので、この開路電圧が所定
電圧以下となるまで電池の放電と放置とを繰り返せば、
負極に残留するリチウムイオン等を確実に所定量以下に
減少させることができる。According to the first aspect of the present invention, when the battery is discharged in the discharging step, an alkali metal such as lithium or an alkali metal ion (hereinafter referred to as "lithium ion or the like") existing in a portion of the negative electrode facing the positive electrode. ) Moves to the positive electrode and the battery is left to stand in the standing step, lithium ions and the like remaining in the non-opposing portion of the negative electrode which does not face the positive electrode diffuse into the entire portion including the facing portion. Therefore, when this battery is discharged again in the discharging step, lithium ions and the like diffused in the facing portion of the negative electrode move to the positive electrode,
When the battery is left in the leaving step again, the lithium ions and the like remaining in the non-opposing portion of the negative electrode even after the previous diffusion are diffused again to the entire portion including the facing portion. Then, by repeating the discharging step and the leaving step, the lithium ions and the like remaining in the negative electrode are repeatedly diffused and moved to the positive electrode, and gradually decrease. Further, when the open circuit voltage is measured after the lithium ions and the like are diffused throughout the negative electrode in the standing step, the voltage according to the amount of the lithium ions and the like remaining on the negative electrode can be detected, and thus the open circuit voltage is equal to or lower than the predetermined voltage. If you repeatedly discharge and leave the battery until
Lithium ions and the like remaining on the negative electrode can be reliably reduced to a predetermined amount or less.
【００１３】なお、放電工程による電池の放電は、完全
放電まで行うことが好ましい。また、この放電は、定電
流放電によることが好ましく、パルス放電であってもよ
い。このようにして負極に残留するリチウムイオン等を
十分に減少させた非水電解質二次電池は、そのまま保管
してもよいし、直ちに使用できるように充電を行っても
よい。It is preferable that the discharging of the battery in the discharging step is performed until complete discharging. Further, this discharge is preferably constant current discharge, and may be pulse discharge. The non-aqueous electrolyte secondary battery in which the lithium ions and the like remaining on the negative electrode are sufficiently reduced in this manner may be stored as it is or charged so that it can be immediately used.
【００１４】請求項２の非水電解質二次電池の充電方法
は、前記開路電圧検出工程により検出された電池の開路
電圧が所定電圧以下になった後に、この電池の充電を行
うことを特徴とする。The method for charging a non-aqueous electrolyte secondary battery according to claim 2 is characterized in that the battery is charged after the open circuit voltage of the battery detected by the open circuit voltage detecting step becomes equal to or lower than a predetermined voltage. To do.
【００１５】請求項２の発明によれば、負極に残留する
リチウムイオン等を十分に減少させた非水電解質二次電
池を充電するので、リチウムイオン等は負極の対向部分
にのみ存在することになる。従って、この電池を直ちに
使用すれば、リチウムイオン等を全て正極に移動させる
ことができるので、放電容量が回復する。According to the second aspect of the invention, since the non-aqueous electrolyte secondary battery in which the lithium ions and the like remaining in the negative electrode are sufficiently reduced is charged, the lithium ions and the like exist only in the facing portion of the negative electrode. Become. Therefore, if this battery is used immediately, all the lithium ions and the like can be moved to the positive electrode, and the discharge capacity is restored.
【００１６】請求項３の非水電解質二次電池の放電装置
は、電池の放電を行う放電手段と、この放電手段により
放電を行った電池を所定時間放置する放置手段と、この
放置手段により放置した後の電池の開路電圧を検出する
開路電圧検出手段と、これら放電手段による放電と放置
手段による放置と開路電圧検出手段による検出を、この
開路電圧検出手段により検出された電池の開路電圧が所
定電圧以下となるまで繰り返す繰り返し手段とを備えた
ことを特徴とする。According to a third aspect of the present invention, there is provided a discharge device for a non-aqueous electrolyte secondary battery, a discharging means for discharging the battery, a leaving means for leaving the battery discharged by the discharging means for a predetermined time, and a leaving means for leaving the battery After that, the open circuit voltage detecting means for detecting the open circuit voltage of the battery, the discharge by the discharging means, the leaving by the leaving means, and the detection by the open circuit voltage detecting means, the open circuit voltage of the battery detected by the open circuit voltage detecting means And a repeating unit that repeats until the voltage becomes equal to or lower than the voltage.
【００１７】請求項３の発明によれば、放電手段により
電池の放電を行うと、負極の対向部分のリチウムイオン
等が正極に移動し、放置手段によりこの電池を放置する
と、負極の非対向部分に残留したリチウムイオン等が対
向部分を含む全体に拡散する。そこで、この電池を再度
放電手段により放電すると、負極の対向部分に拡散した
リチウムイオン等が正極に移動し、再度放置手段により
この電池を放置すると、負極の非対向部分に先の拡散で
も残留したリチウムイオン等が再び対向部分を含む全体
に拡散する。そして、この放電手段と放置手段による放
電と放置を繰り返すことにより、負極に残留するリチウ
ムイオン等が拡散と正極への移動を繰り返し徐々に減少
するようになる。また、放置手段によってリチウムイオ
ン等が負極全体に拡散した後に開路電圧検出手段によっ
て開路電圧を測定すると、この負極に残留したリチウム
イオン等の量に応じた電圧を検出することができるの
で、繰り返し手段によりこの開路電圧が所定電圧以下と
なるまで電池の放電と放置とを繰り返せば、負極に残留
するリチウムイオン等を確実に所定量以下に減少させる
ことができる。According to the third aspect of the present invention, when the battery is discharged by the discharging means, lithium ions and the like in the facing portion of the negative electrode move to the positive electrode, and when the battery is left by the leaving means, the non-facing portion of the negative electrode. The remaining lithium ions and the like diffuse into the whole including the facing portion. Then, when this battery was discharged again by the discharging means, the lithium ions and the like diffused in the facing portion of the negative electrode moved to the positive electrode, and when this battery was left again by the leaving means, it remained even in the previous diffusion in the non-facing portion of the negative electrode. Lithium ions and the like diffuse again into the entire area including the facing portion. Then, by repeatedly discharging and leaving by the discharging means and the leaving means, the lithium ions and the like remaining in the negative electrode are repeatedly diffused and moved to the positive electrode, and gradually decrease. Further, when the open-circuit voltage detecting means measures the open-circuit voltage after the lithium ions and the like are diffused over the entire negative electrode by the leaving means, the voltage according to the amount of the lithium-ion and the like remaining in the negative electrode can be detected. Thus, by repeatedly discharging and leaving the battery until the open circuit voltage becomes equal to or lower than the predetermined voltage, it is possible to reliably reduce the amount of lithium ions and the like remaining in the negative electrode to the predetermined amount or less.
【００１８】なお、放電手段による電池の放電は、完全
放電まで行うことが好ましい。また、この放電は、定電
流放電によることが好ましく、パルス放電であってもよ
い。このようにして負極に残留するリチウムイオン等を
十分に減少させた非水電解質二次電池は、そのまま保管
してもよいし、直ちに使用できるように充電を行っても
よい。It is preferable that the discharging means discharges the battery to complete discharge. Further, this discharge is preferably constant current discharge, and may be pulse discharge. The non-aqueous electrolyte secondary battery in which the lithium ions and the like remaining on the negative electrode are sufficiently reduced in this manner may be stored as it is or charged so that it can be immediately used.
【００１９】請求項４の非水電解質二次電池の放電機能
を備える充電装置は、前記繰り返し手段による繰り返し
の終了後に電池の充電を行う充電手段が設けられたこと
を特徴とする。According to a fourth aspect of the present invention, there is provided a charging device having a discharging function for a non-aqueous electrolyte secondary battery, which is provided with a charging means for charging the battery after the repetition by the repeating means is completed.
【００２０】請求項４の発明によれば、負極に残留する
リチウムイオン等を十分に減少させた非水電解質二次電
池を充電するので、リチウムイオン等は負極の対向部分
にのみ存在することになる。従って、この電池を直ちに
使用すれば、リチウムイオン等を全て正極に移動させる
ことができるので、放電容量が回復する。According to the invention of claim 4, since the non-aqueous electrolyte secondary battery in which the lithium ions and the like remaining in the negative electrode are sufficiently reduced is charged, the lithium ions and the like exist only in the facing portion of the negative electrode. Become. Therefore, if this battery is used immediately, all the lithium ions and the like can be moved to the positive electrode, and the discharge capacity is restored.
【００２１】請求項５の非水電解質二次電池の放電方
法、充電方法とその装置は、前記所定電圧が、公称電圧
の７５％の電圧であることを特徴とする。The non-aqueous electrolyte secondary battery discharging method, charging method, and apparatus therefor according to claim 5 are characterized in that the predetermined voltage is 75% of the nominal voltage.
【００２２】請求項５の発明によれば、非水電解質二次
電池の開路電圧が公称電圧の７５％以下に低下するまで
放電と放置を繰り返すので、負極にほとんどリチウムイ
オン等が残留しない状態にし、放電容量を十分に回復さ
せることができるようになる。According to the invention of claim 5, discharge and leaving are repeated until the open circuit voltage of the non-aqueous electrolyte secondary battery drops to 75% or less of the nominal voltage, so that almost no lithium ions remain in the negative electrode. , The discharge capacity can be sufficiently restored.
【００２３】請求項６の非水電解質二次電池の放電方
法、充電方法とその装置は、前記所定電圧が、公称電圧
の１／２以上、３／４以下の電圧であることを特徴とす
る。According to a sixth aspect of the present invention, there is provided a method for discharging a non-aqueous electrolyte secondary battery, a method for charging the same, and an apparatus therefor, wherein the predetermined voltage is a voltage not lower than 1/2 and not higher than 3/4 of a nominal voltage. .
【００２４】請求項６の発明によれば、非水電解質二次
電池の開路電圧が公称電圧の１／２〜３／４以下に低下
するまで放電と放置を繰り返すので、負極にほとんどリ
チウムイオン等が残留しない状態にし、放電容量を十分
に回復させることができるようになる。According to the sixth aspect of the present invention, the discharge and the standing are repeated until the open circuit voltage of the non-aqueous electrolyte secondary battery falls to 1/2 to 3/4 or less of the nominal voltage, so that most of the negative electrode is lithium ion or the like. Will not remain, and the discharge capacity can be sufficiently restored.
【００２５】請求項７の非水電解質二次電池の放電方
法、充電方法とその装置は、前記所定時間が３０分間以
上であることを特徴とする。The non-aqueous electrolyte secondary battery discharging method, charging method, and apparatus therefor according to claim 7 are characterized in that the predetermined time is 30 minutes or more.
【００２６】請求項７の発明によれば、放電後に電池を
３０分間以上放置するので、負極の非対向部分に残留し
たリチウムイオン等を対向部分にまで十分に拡散させる
ことができ、開路電圧の検出や再度の放電を確実に実行
できるようにする。According to the invention of claim 7, since the battery is left for 30 minutes or more after discharging, it is possible to sufficiently diffuse the lithium ions and the like remaining in the non-opposing portion of the negative electrode to the opposing portion, and the open circuit voltage Ensure detection and re-discharge.
【００２７】[0027]
【発明の実施の形態】以下、本発明の実施形態について
図面を参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００２８】図１〜図３は本発明の一実施形態を示すも
のであって、図１は非水電解質二次電池の放電装置にお
ける容量回復処理の動作を説明するためのフローチャー
ト、図２は容量回復処理によって負極の非対向部分に残
留していたリチウムイオンが正極に移動する様子を示す
電極の縦断面模式図、図３は非水電解質二次電池の放電
装置の構成を示すブロック図である。なお、図４に示し
た従来例と同様の機能を有する構成部材には同じ番号を
付記する。1 to 3 show one embodiment of the present invention, FIG. 1 is a flow chart for explaining the operation of a capacity recovery process in a discharge device of a non-aqueous electrolyte secondary battery, and FIG. FIG. 3 is a schematic vertical cross-sectional view of an electrode showing a state in which lithium ions remaining in the non-opposing portion of the negative electrode move to the positive electrode due to the capacity recovery process. FIG. 3 is a block diagram showing the configuration of the discharge device of the non-aqueous electrolyte secondary battery. is there. The constituent elements having the same functions as those of the conventional example shown in FIG.
【００２９】本実施形態は、非水電解質二次電池に組み
込まれた放電装置及びこの放電装置を用いた放電方法に
ついて説明する。この非水電解質二次電池は、図３に示
すように、電池セル３の正極が接続用正極端子４に接続
されると共に、負極がスイッチ回路５を介して接続用負
極端子６に接続されている。また、この電池セル３の正
負極間には、スイッチ回路５を介してそれぞれ定電流放
電回路７と電圧検出器８とが接続されている。定電流放
電回路７は、スイッチ回路５が電池セル３との接続をＯ
Ｎにすると、この電池セル３を定電流放電させる回路で
ある。電圧検出器８は、スイッチ回路５が電池セル３と
の接続をＯＮにすると、この電池セル３の電圧を検出す
る回路であり、検出した電圧は、制御信号としてスイッ
チ回路５に送られるようになっている。In this embodiment, a discharging device incorporated in a non-aqueous electrolyte secondary battery and a discharging method using this discharging device will be described. In this non-aqueous electrolyte secondary battery, as shown in FIG. 3, the positive electrode of the battery cell 3 is connected to the connecting positive electrode terminal 4, and the negative electrode is connected to the connecting negative electrode terminal 6 via the switch circuit 5. There is. A constant current discharge circuit 7 and a voltage detector 8 are connected between the positive and negative electrodes of the battery cell 3 via a switch circuit 5, respectively. In the constant current discharge circuit 7, the switch circuit 5 turns off the connection with the battery cell 3.
When set to N, this is a circuit for discharging the battery cell 3 with a constant current. The voltage detector 8 is a circuit that detects the voltage of the battery cell 3 when the switch circuit 5 turns on the connection to the battery cell 3, and the detected voltage is sent to the switch circuit 5 as a control signal. Has become.
【００３０】スイッチ回路５は、電池セル３の放電容量
を回復させる容量回復処理を実行する回路であり、この
電池セル３と接続用負極端子６の間の接続をＯＮ／ＯＦ
Ｆするスイッチと、この電池セル３と定電流放電回路７
の間の接続をＯＮ／ＯＦＦするスイッチと、この電池セ
ル３と電圧検出器８の間の接続をＯＮ／ＯＦＦするスイ
ッチが設けられると共に、これらのスイッチのＯＮ／Ｏ
ＦＦを制御する制御回路を備えている。制御回路は、マ
イクロコンピュータやワイヤードロジック回路等によっ
て構成される。そして、この制御回路に、電圧検出器８
からの開路電圧の制御信号が入力されるようになってい
る。The switch circuit 5 is a circuit for executing a capacity recovery process for recovering the discharge capacity of the battery cell 3, and the connection between the battery cell 3 and the connection negative terminal 6 is turned ON / OF.
F switch, battery cell 3 and constant current discharge circuit 7
And a switch for turning on / off the connection between the battery cell 3 and the voltage detector 8, and a switch for turning on / off these switches.
The control circuit which controls FF is provided. The control circuit is composed of a microcomputer, a wired logic circuit, or the like. The voltage detector 8 is added to this control circuit.
The control signal of the open circuit voltage from is input.
【００３１】上記スイッチ回路５の動作を図１に示すフ
ローチャートに基づいて説明する。The operation of the switch circuit 5 will be described with reference to the flow chart shown in FIG.
【００３２】非水電解質二次電池の電池セル３は、使用
を開始してからある程度の期間が経過したり、充放電を
ある程度の回数繰り返した場合に、図２（ａ）に示すよ
うに、負極２における正極１と対向する対向部分２ａだ
けでなく、この正極１に対向しない非対向部分２ｂにま
でリチウムイオン（ドットハッチングで示す。以下同
じ）が拡散し、これが電池セル３の放電容量の減少の原
因となる。As shown in FIG. 2 (a), the battery cell 3 of the non-aqueous electrolyte secondary battery is, as shown in FIG. Not only the facing portion 2a of the negative electrode 2 facing the positive electrode 1 but also the non-facing portion 2b of the negative electrode 1 not facing the positive electrode 1 diffuses lithium ions (shown by dot hatching; the same applies hereinafter), which is the discharge capacity of the battery cell 3. Cause a decrease.
【００３３】スイッチ回路５は、上記電池セル３の放電
容量がある程度以上減少した場合に、手操作や自動検出
に基づいて電池セル３の容量回復処理の実行を開始す
る。手操作による場合としては、例えば一定期間ごとや
充放電の一定回数ごと、又は、放電容量や充電容量を測
定した結果に基づいて、作業者が判断し操作することに
よりスイッチ回路５に容量回復処理を実行させる。ま
た、自動検出による場合としては、例えば充放電回数を
計数するカウンタのカウント結果や放電容量又は充電容
量を検出する検出器の検出結果が所定値を超えた場合
に、自動的にスイッチ回路５に容量回復処理を実行させ
る。When the discharge capacity of the battery cell 3 has decreased to some extent or more, the switch circuit 5 starts executing the capacity recovery processing of the battery cell 3 based on a manual operation or automatic detection. In the case of manual operation, for example, the switch circuit 5 is subjected to a capacity recovery process by an operator judging and operating based on, for example, a fixed period, a fixed number of times of charging / discharging, or a result of measuring discharge capacity or charge capacity. To execute. In the case of automatic detection, for example, when the count result of the counter that counts the number of times of charge and discharge and the detection result of the detector that detects the discharge capacity or the charge capacity exceed a predetermined value, the switch circuit 5 is automatically set. Execute capacity recovery processing.
【００３４】本実施形態では、非水電解質二次電池の充
電を行った場合に、この充電容量を検出して自動的にス
イッチ回路５が容量回復処理を実行する場合について説
明する。この場合、例えば電池セル３と接続用正極端子
４との間に図示しない電流検出器を配置しておき、充電
期間中の充電電流をこの電流検出器で検出して積分を行
うことにより充電電気量を調べ、この充電電気量が所定
量以下であった場合にスイッチ回路５が容量回復処理を
実行することになる。In the present embodiment, a case will be described in which, when the non-aqueous electrolyte secondary battery is charged, the charge capacity is detected and the switch circuit 5 automatically executes the capacity recovery process. In this case, for example, a current detector (not shown) is arranged between the battery cell 3 and the positive electrode terminal 4 for connection, and the charging current is detected by the current detector during the charging period and integration is performed to charge the battery. The amount is checked, and when the charged electricity amount is less than or equal to the predetermined amount, the switch circuit 5 executes the capacity recovery process.
【００３５】容量回復処理が開始されると、まず最初の
ステップ（以下「Ｓ」という）で、スイッチ回路５が電
池セル３と接続用負極端子６の間のスイッチをＯＦＦに
すると共に、この電池セル３と定電流放電回路７の間の
スイッチをＯＮにして、電池セル３の定電流放電を行う
（Ｓ１）。定電流放電回路７は、電池セル３の放電電流
が所定値を超えないような一定電流となるように放電を
行わせる。スイッチ回路５は、この定電流放電の間に電
池セル３と電圧検出器８との間のスイッチをＯＮにし
て、電池セル３の放電電圧を検出し、この放電電圧が所
定値を下回って完全放電されると、定電流放電回路７の
スイッチをＯＦＦにして定電流放電を停止させる。When the capacity recovery process is started, in the first step (hereinafter referred to as “S”), the switch circuit 5 turns off the switch between the battery cell 3 and the connection negative electrode terminal 6, and A switch between the cell 3 and the constant current discharge circuit 7 is turned on to perform constant current discharge of the battery cell 3 (S1). The constant current discharge circuit 7 discharges the battery cells 3 so that the discharge current of the battery cells 3 becomes a constant current that does not exceed a predetermined value. The switch circuit 5 turns on the switch between the battery cell 3 and the voltage detector 8 during this constant current discharge, detects the discharge voltage of the battery cell 3, and the discharge voltage falls below a predetermined value to complete the discharge. When discharged, the switch of the constant current discharge circuit 7 is turned off to stop the constant current discharge.
【００３６】スイッチ回路５が容量回復処理を実行する
前には電池セル３の充電が一旦完了しているので、図２
（ａ）に示すように、リチウムイオンは負極２に吸蔵さ
れている。そして、Ｓ１の処理により電池セル３が完全
放電されると、図２（ｂ）に示すように、負極２の対向
部分２ａのリチウムイオンが正極１に移動する。ただ
し、この負極２の非対向部分２ｂに拡散していたリチウ
ムイオンは、ほとんどが正極１に移動することなくその
まま残留する。Since the charging of the battery cells 3 is once completed before the switch circuit 5 executes the capacity recovery process,
As shown in (a), lithium ions are occluded in the negative electrode 2. When the battery cell 3 is completely discharged by the process of S1, the lithium ions in the facing portion 2a of the negative electrode 2 move to the positive electrode 1 as shown in FIG. 2 (b). However, most of the lithium ions diffused in the non-opposing portion 2b of the negative electrode 2 remain as they are without moving to the positive electrode 1.
【００３７】Ｓ１による定電流放電処理が完了すると、
スイッチ回路５は、電池セル３との間の全てのスイッチ
をＯＦＦにして、一定時間放置する（Ｓ２）。この放置
時間は、少なくとも３０分間以上であることが好まし
く、５時間以上であれば最適である。電池セル３をこの
ように放置すると、図２（ｃ）に示すように、負極２の
非対向部分２ｂに残留していたリチウムイオンが対向部
分２ａにまで拡散する。When the constant current discharge process in S1 is completed,
The switch circuit 5 turns off all the switches between the battery cell 3 and the switch cells 5 and leaves them for a certain period of time (S2). This standing time is preferably at least 30 minutes or more, and optimally 5 hours or more. When the battery cell 3 is left in this way, as shown in FIG. 2C, the lithium ions remaining in the non-opposing portion 2b of the negative electrode 2 diffuse to the opposing portion 2a.
【００３８】Ｓ２による放置処理が完了すると、スイッ
チ回路５は、電池セル３と電圧検出器８の間のスイッチ
をＯＮにして、この電池セル３の開路電圧Ｖopを検出す
る（Ｓ３）。電池セル３の開路電圧Ｖopは、Ｓ２で長時
間放置されると、非対向部分２ｂのリチウムイオンが負
極２全体に広がることにより、Ｓ１で完全放電されたと
きよりも若干回復する。このようにして検出された開路
電圧Ｖopは、所定電圧Ｖthと比較される（Ｓ４）。そし
て、開路電圧Ｖopがまだ所定電圧Ｖthを超えている場合
には、Ｓ１の定電流放電処理に戻り、以降、開路電圧Ｖ
opが所定電圧Ｖ th以下となるまでＳ１〜Ｓ４のループ処
理が繰り返し実行される。When the leaving process in S2 is completed, the switch
H circuit 5 is a switch between the battery cell 3 and the voltage detector 8.
Is turned on, and the open circuit voltage V of this battery cell 3opDetect
(S3). Open circuit voltage V of battery cell 3opIs long in S2
If left unattended for a while, the lithium ions in the non-opposing portion 2b become negative.
When it is completely discharged in S1, it spreads over the entire pole 2.
It recovers a little more than that. Open circuit detected in this way
Voltage VopIs a predetermined voltage Vth(S4). That
Open circuit voltage VopIs still the predetermined voltage VthWhen exceeds
Returns to the constant current discharge process of S1, and thereafter, the open circuit voltage V
opIs the predetermined voltage V thLoop processing of S1 to S4 until the following
The reason is repeatedly executed.
【００３９】上記Ｓ１〜Ｓ４のループ処理では、２回目
のＳ１の定電流放電処理が行われると、図２（ｄ）に示
すように、負極２の対向部分２ａに拡散していたリチウ
ムイオンが正極１に移動するが、非対向部分２ｂのリチ
ウムイオンはほとんどそのまま残留することになる。ま
た、２回目のＳ２の放置処理が行われると、図２（ｅ）
に示すように、負極２の非対向部分２ｂに残留していた
リチウムイオンが対向部分２ａにまで拡散して全体に広
がる。そして、このようにしてＳ１の定電流放電処理が
繰り返されるたびに、負極２の非対向部分２ｂに残留し
ていたリチウムイオンが拡散して対向部分２ａから正極
１に移動するので、この負極２のリチウムイオンが徐々
に減少し、Ｓ３の開路電圧検出処理によって検出した開
路電圧Ｖ opも、完全放電状態の電圧からほとんど回復し
なくなる。In the loop processing of S1 to S4, the second time
When the constant current discharge process of S1 is performed, it is shown in FIG.
As a result, the lithium that has diffused to the facing portion 2a of the negative electrode 2
Although the ions move to the positive electrode 1, the lithium ion in the non-facing portion 2b
The um ions will remain almost as they are. Well
When the second leaving process of S2 is performed, as shown in FIG.
As shown in FIG. 5, it remained on the non-opposing portion 2b of the negative electrode 2.
Lithium ions diffuse to the facing portion 2a and spread to the whole area.
Get up. Then, in this way, the constant current discharge process of S1
Each time it is repeated, it remains on the non-opposing portion 2b of the negative electrode 2.
Lithium ions diffused and diffused from the facing portion 2a to the positive electrode.
As it moves to 1, the lithium ions in this negative electrode 2 gradually
To the open circuit voltage detected by the open circuit voltage detection process of S3.
Road voltage V opHas recovered almost completely from the fully discharged voltage
Disappear.
【００４０】上記Ｓ１〜Ｓ４のループ処理によって開路
電圧Ｖopが徐々に低下して所定電圧Ｖth以下になると、
負極２の非対向部分２ｂに残留するリチウムイオンは拡
散の繰り返しによって薄まりほとんど存在しなくなるの
で、容量回復処理は完了する。例えば非水電解質二次電
池の容量回復処理だけを行う放電装置の場合には、ここ
で全ての処理が完了し、以降は非水電解質二次電池を保
存のために保管したり、充電器にセットして充電を行う
こと等が可能となる。なお、何らかの異常により、Ｓ１
〜Ｓ４のループ処理を何度繰り返しても開路電圧Ｖopが
所定電圧Ｖth以下に低下しない場合には、異常処理とし
てこのループ処理を強制的に打ち切るようにすることも
できる。When the open circuit voltage V op is gradually reduced to the predetermined voltage V th or lower by the loop processing of S1 to S4,
The lithium ions remaining in the non-opposing portion 2b of the negative electrode 2 are thinned by the repeated diffusion and become almost nonexistent, so that the capacity recovery process is completed. For example, in the case of a discharge device that only performs capacity recovery processing for non-aqueous electrolyte secondary batteries, all the processing is completed here, and after that, the non-aqueous electrolyte secondary batteries are stored for storage or stored in the charger. It is possible to set and charge the battery. In addition, due to some abnormality, S1
If the open circuit voltage V op does not drop below the predetermined voltage V th no matter how many times the loop process of S4 is repeated, this loop process can be forcibly terminated as an abnormal process.
【００４１】本実施形態では、非水電解質二次電池の充
電中に容量回復処理を実行するので、Ｓ４で開路電圧Ｖ
opが所定電圧Ｖth以下になったと判断されると、ループ
処理を終了して、スイッチ回路５が電池セル３と接続用
負極端子６のスイッチのみをＯＮにすることにより、再
度充電を行うことになる（Ｓ５）。このように負極２の
非対向部分２ｂにリチウムイオンがほとんど残留しなく
なってから充電を行うと、図４（ｂ）に示したように、
このリチウムイオンは負極２に移動しても、対向部分２
ａにしか存在しないことになる。そして、この対向部分
２ａのリチウムイオンは、放電によってほとんどが正極
１に移動するので、放電容量を回復することができる。In this embodiment, since the capacity recovery process is executed during charging of the non-aqueous electrolyte secondary battery, the open circuit voltage V is determined in S4.
When it is determined that op has become equal to or lower than the predetermined voltage V th , the loop processing is ended, and the switch circuit 5 turns on only the switches of the battery cell 3 and the connection negative electrode terminal 6 to perform charging again. (S5). As described above, when charging is performed after almost no lithium ions remain in the non-opposing portion 2b of the negative electrode 2, as shown in FIG.
Even if the lithium ions move to the negative electrode 2, the facing portion 2
It only exists in a. Most of the lithium ions in the facing portion 2a move to the positive electrode 1 due to discharge, so that the discharge capacity can be restored.
【００４２】ここで、非水電解質二次電池の公称電圧が
３．６Ｖであるとすると、例えばＳ１の定電流放電処理
では、電池セル３の放電電圧が２．５Ｖ以下となるまで
放電を行うことにより完全放電させる。そして、Ｓ４で
比較対象となる所定電圧Ｖthを、公称電圧の７５％に相
当する２．７Ｖに定め、電池セル３の開路電圧Ｖopがこ
の所定電圧Ｖthを超えるほどには回復しなかった場合
に、容量回復処理を終了すればよい。もっとも、この所
定電圧Ｖthは、電池の公称電圧の相違や種類の相違等に
応じて任意に定めることができる。例えば、７５％以下
の低電圧に定める場合には、公称電圧の１／２以上、３
／４以下の電圧が好ましい。なお、公称電圧とは、電池
放電電圧の平均的な値を意味し、例えば、放電電圧曲線
の比較的なだらかな電圧変化を示す領域における平均電
圧から、電池製造者が独自に決めたものである。Here, assuming that the nominal voltage of the non-aqueous electrolyte secondary battery is 3.6 V, for example, in the constant current discharge process of S1, the battery cell 3 is discharged until the discharge voltage becomes 2.5 V or less. To completely discharge. Then, in S4, the predetermined voltage V th to be compared is set to 2.7 V corresponding to 75% of the nominal voltage, and the open circuit voltage V op of the battery cell 3 does not recover to such an extent that it exceeds the predetermined voltage V th. If so, the capacity recovery process may be terminated. However, the predetermined voltage V th can be arbitrarily determined according to the difference in the nominal voltage of the battery, the difference in the type, and the like. For example, when setting a low voltage of 75% or less, 1/2 or more of the nominal voltage, 3
A voltage of / 4 or less is preferable. Note that the nominal voltage means an average value of the battery discharge voltage, and is, for example, uniquely determined by the battery manufacturer from the average voltage in a region showing a comparatively gentle voltage change of the discharge voltage curve. .
【００４３】上記構成により、本実施形態によれば、Ｓ
１の定電流放電処理とＳ２の放置処理を繰り返すことに
より、負極２の非対向部分２ｂに残留するリチウムイオ
ンを正極１に移動させて徐々に薄めることができるの
で、この非対向部分２ｂにリチウムイオンが拡散するこ
とにより減少した放電容量を回復することができるよう
になる。With the above configuration, according to the present embodiment, S
By repeating the constant current discharge treatment of No. 1 and the standing treatment of S2, the lithium ions remaining in the non-opposing portion 2b of the negative electrode 2 can be moved to the positive electrode 1 and gradually diluted, so that the non-opposing portion 2b is charged with lithium. Due to the diffusion of the ions, the reduced discharge capacity can be recovered.
【００４４】特に、巻回型の発電要素を用いる非水電解
質二次電池では、負極２が正極１よりも余分に巻回され
て非対向部分２ｂの面積が広くなり、これによる放電容
量の減少が大きくなるので、本実施形態を実施すること
により放電容量も大きく回復するようになる。また、一
般的には、負極２の面積が正極１の１．０５倍以上ある
非水電解質二次電池の場合に、十分な放電容量の回復を
見込めるので、実用的価値がある。Particularly, in a non-aqueous electrolyte secondary battery using a wound type power generating element, the negative electrode 2 is wound more than the positive electrode 1 and the non-opposing portion 2b has a larger area, which reduces the discharge capacity. Therefore, the discharge capacity can be largely restored by implementing the present embodiment. Further, in general, in the case of a non-aqueous electrolyte secondary battery in which the area of the negative electrode 2 is 1.05 times or more that of the positive electrode 1, sufficient recovery of the discharge capacity can be expected, which is of practical value.
【００４５】なお、上記実施形態では、Ｓ１の定電流放
電処理で定電流放電を行う場合について説明したが、例
えばパルス放電等の他の方式による放電処理を行うこと
もできる。また、このＳ１では、電池セル３が完全放電
するまで放電処理を行ったが、この放電によって負極２
の対向部分２ａのリチウムイオンの濃度が非対向部分２
ｂよりも薄くなれば、Ｓ２の放置処理によって拡散は行
われるので、必ずしも完全放電まで放電を行う必要はな
い。In the above embodiment, the case of performing constant current discharge in the constant current discharge process of S1 has been described, but it is also possible to perform discharge process by another method such as pulse discharge. Further, in this S1, the discharge treatment was performed until the battery cells 3 were completely discharged.
The concentration of lithium ions in the facing portion 2a of the
If the thickness becomes thinner than b, the diffusion is performed by the standing treatment of S2, and therefore it is not always necessary to perform the complete discharge.
【００４６】また、上記実施形態では、リチウムイオン
が正極１と負極２との間で移動する非水電解質二次電池
について説明したが、リチウムイオン以外のアルカリ金
属イオンを用いる非水電解質二次電池であってもよく、
金属リチウムやその他のアルカリ金属を用いた非水電解
質二次電池にも同様に実施可能である。In the above embodiment, the non-aqueous electrolyte secondary battery in which lithium ions move between the positive electrode 1 and the negative electrode 2 has been described, but the non-aqueous electrolyte secondary battery using alkali metal ions other than lithium ions. May be
The same can be applied to a non-aqueous electrolyte secondary battery using metallic lithium or another alkali metal.
【００４７】[0047]
【発明の効果】以上の説明から明らかなように、本発明
の非水電解質二次電池の放電方法、充電方法とその装置
によれば、開路電圧が所定電圧以下となるまで電池の放
電と放置を繰り返すことにより、負極の非対向部分に残
留していたリチウムイオン等のほとんどを正極に移動さ
せるので、非水電解質二次電池の放電容量を確実に回復
させることができるようになる。As is apparent from the above description, according to the discharging method, charging method and apparatus for a non-aqueous electrolyte secondary battery of the present invention, the battery is discharged and left until the open circuit voltage becomes a predetermined voltage or less. By repeating the above, most of the lithium ions and the like remaining in the non-opposing portion of the negative electrode are moved to the positive electrode, so that the discharge capacity of the non-aqueous electrolyte secondary battery can be reliably recovered.
【図１】本発明の一実施形態を示すものであって、非水
電解質二次電池の放電装置における容量回復処理の動作
を説明するためのフローチャートである。FIG. 1 shows an embodiment of the present invention and is a flowchart for explaining the operation of a capacity recovery process in a discharge device for a non-aqueous electrolyte secondary battery.
【図２】本発明の一実施形態を示すものであって、容量
回復処理によって負極の非対向部分に残留していたリチ
ウムイオンが正極に移動する様子を示す電極の縦断面模
式図である。FIG. 2 shows an embodiment of the present invention and is a schematic vertical cross-sectional view of an electrode showing a state in which lithium ions remaining in non-opposing portions of a negative electrode move to a positive electrode due to a capacity recovery process.
【図３】本発明の一実施形態を示すものであって、非水
電解質二次電池の放電装置の構成を示すブロック図であ
る。FIG. 3 shows an embodiment of the present invention and is a block diagram showing a configuration of a discharge device of a non-aqueous electrolyte secondary battery.
【図４】使用に伴い負極の非対向部分にリチウムイオン
が残留する様子を示す電極の縦断面模式図である。FIG. 4 is a schematic vertical cross-sectional view of an electrode showing a state in which lithium ions remain in the non-opposing portion of the negative electrode during use.
１ 正極 ２ 負極 ２ａ 対向部分 ２ｂ 非対向部分 ３ 電池セル ５ スイッチ回路 ７ 定電流放電回路 ８ 電圧検出器 1 positive electrode 2 Negative electrode 2a facing part 2b Non-opposing part 3 battery cells 5 switch circuits 7 Constant current discharge circuit 8 voltage detector
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H030 AA01 AS20 BB01 BB21 FF41 FF43 FF52 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 5H030 AA01 AS20 BB01 BB21 FF41 FF43 FF52
Claims (7)
る放置工程と、 この放置工程により放置した後の電池の開路電圧を検出
する開路電圧検出工程とを、 この開路電圧検出工程により検出された電池の開路電圧
が所定電圧以下となるまで繰り返すことを特徴とする非
水電解質二次電池の放電方法。1. A discharging step of discharging a battery, a leaving step of leaving the battery discharged by the discharging step for a predetermined time, and an open circuit voltage detection for detecting an open circuit voltage of the battery after being left by the leaving step. And a step of repeating the steps until the open circuit voltage of the battery detected by the open circuit voltage detecting step becomes equal to or lower than a predetermined voltage.
電池の開路電圧が所定電圧以下になった後に、この電池
の充電を行うことを特徴とする請求項１に記載の非水電
解質二次電池の充電方法。2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the battery is charged after the open circuit voltage of the battery detected by the open circuit voltage detecting step becomes equal to or lower than a predetermined voltage. Charging method.
る放置手段と、 この放置手段により放置した後の電池の開路電圧を検出
する開路電圧検出手段と、 これら放電手段による放電と放置手段による放置と開路
電圧検出手段による検出を、この開路電圧検出手段によ
り検出された電池の開路電圧が所定電圧以下となるまで
繰り返す繰り返し手段とを備えたことを特徴とする非水
電解質二次電池の放電装置。3. A discharging means for discharging the battery, a leaving means for leaving the battery discharged by the discharging means for a predetermined time, and an open circuit voltage detection for detecting an open circuit voltage of the battery after being left by the leaving means. And means for repeating discharging by the discharging means, leaving by the leaving means and detection by the open circuit voltage detecting means until the open circuit voltage of the battery detected by the open circuit voltage detecting means becomes equal to or lower than a predetermined voltage. Discharge device for a non-aqueous electrolyte secondary battery, which is characterized by:
後に電池の充電を行う充電手段が設けられたことを特徴
とする請求項３に記載の非水電解質二次電池の放電機能
を備える充電装置。4. The charging device having a discharging function for a non-aqueous electrolyte secondary battery according to claim 3, further comprising a charging unit that charges the battery after the repeating by the repeating unit.
圧であることを特徴とする請求項１，２，３又は４に記
載の非水電解質二次電池の放電方法、充電方法とその装
置。5. The discharging method and charging method for a non-aqueous electrolyte secondary battery according to claim 1, 2, 3 or 4, wherein the predetermined voltage is 75% of a nominal voltage. apparatus.
上、３／４以下の電圧であることを特徴とする請求項
１，２，３又は４に記載の非水電解質二次電池の放電方
法、充電方法とその装置。6. The non-aqueous electrolyte secondary battery according to claim 1, wherein the predetermined voltage is a voltage that is ½ or more and 3/4 or less of a nominal voltage. Discharging method, charging method and its device.
を特徴とする請求項１，２，３，４，５又は６に記載の
非水電解質二次電池の放電方法、充電方法とその装置。7. The discharging method, the charging method and the apparatus for the non-aqueous electrolyte secondary battery according to claim 1, 2, 3, 4, 5 or 6, wherein the predetermined time is 30 minutes or more. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001222457A JP2003036891A (en) | 2001-07-24 | 2001-07-24 | Charge method and discharge method for nonaqueous electrolyte secondary battery and apparatus for the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001222457A JP2003036891A (en) | 2001-07-24 | 2001-07-24 | Charge method and discharge method for nonaqueous electrolyte secondary battery and apparatus for the same |
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| Publication Number | Publication Date |
|---|---|
| JP2003036891A true JP2003036891A (en) | 2003-02-07 |
Family
ID=19055935
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001222457A Pending JP2003036891A (en) | 2001-07-24 | 2001-07-24 | Charge method and discharge method for nonaqueous electrolyte secondary battery and apparatus for the same |
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| US7071653B2 (en) | 2003-05-30 | 2006-07-04 | Matsushita Electric Industrial Co., Ltd. | Method for charging a non-aqueous electrolyte secondary battery and charger therefor |
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| JP2019106333A (en) * | 2017-12-14 | 2019-06-27 | トヨタ自動車株式会社 | Battery system and capacity recovery method for lithium ion secondary battery |
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| JP2011171213A (en) * | 2010-02-22 | 2011-09-01 | Toyota Motor Corp | Device and method of discriminating lithium deposition of lithium ion secondary battery, and vehicle with the device mounted |
| CN103782437A (en) * | 2011-09-09 | 2014-05-07 | 丰田自动车株式会社 | Secondary cell inspecting method |
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| JP2019106333A (en) * | 2017-12-14 | 2019-06-27 | トヨタ自動車株式会社 | Battery system and capacity recovery method for lithium ion secondary battery |
| CN109962302A (en) * | 2017-12-14 | 2019-07-02 | 丰田自动车株式会社 | The capacity restoration method of battery system and lithium ion secondary battery |
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