JP2001292534A - Determining apparatus for deterioration of lithium ion battery - Google Patents
Determining apparatus for deterioration of lithium ion batteryInfo
- Publication number
- JP2001292534A JP2001292534A JP2000102433A JP2000102433A JP2001292534A JP 2001292534 A JP2001292534 A JP 2001292534A JP 2000102433 A JP2000102433 A JP 2000102433A JP 2000102433 A JP2000102433 A JP 2000102433A JP 2001292534 A JP2001292534 A JP 2001292534A
- Authority
- JP
- Japan
- Prior art keywords
- lithium ion
- ion battery
- deterioration
- charging
- voltage
- 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.)
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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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、リチウムイオン電
池の劣化度を判定する装置に関する。The present invention relates to an apparatus for determining the degree of deterioration of a lithium ion battery.
【０００２】[0002]
【従来の技術】電池の劣化度を判定する装置は、種々開
発されている。例えば特開平７−１７６３３３公報に記
載されている装置では、電池の累積使用時間や累積充電
回数に基づき、電池の寿命が尽きたか否かを判定してい
る。また、特開平１１−２１８５６７号公報に記載され
ている装置では、放電の際の電流、電圧の検出値から劣
化度を判定している。2. Description of the Related Art Various devices for determining the degree of deterioration of a battery have been developed. For example, in the device described in JP-A-7-176333, it is determined whether or not the life of the battery has expired based on the cumulative use time of the battery and the cumulative number of times of charging. Further, in the device described in Japanese Patent Application Laid-Open No. H11-218567, the degree of deterioration is determined from detected values of current and voltage during discharge.
【０００３】[0003]
【発明が解決しようとする課題】上記特開平７−１７６
３３３号公報の装置では、電池を一定レベルまで放電し
てその後完全に充電するサイクルを繰り返し行う場合に
は、電池寿命を正確に判定することができるが、不規則
な充放電サイクルを繰り返す場合には正確に判定できな
かった。上記特開平１１−２１８５６７号公報に記載さ
れている装置では、電池に負荷を接続した状態でしか判
定できない欠点があった。しかも、この公報では明らか
ではないが、一般的に放電の際に放電容量に基づいて劣
化度を判定する場合には、負荷の消費電流が一定ではな
いので、変動する電圧と電流を常に計測し、両者の積を
積算していくという煩雑な演算を必要とした。SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 7-176 is disclosed.
In the device disclosed in Japanese Patent No. 333, when the cycle of discharging the battery to a certain level and thereafter fully charging the battery is repeated, the battery life can be accurately determined. Could not be determined accurately. The device described in Japanese Patent Application Laid-Open No. H11-218567 has a disadvantage that the determination can be made only when a load is connected to the battery. In addition, although it is not clear in this publication, generally, when determining the degree of deterioration based on the discharge capacity at the time of discharging, the current consumption of the load is not constant, so that the fluctuating voltage and current are always measured. However, a complicated calculation of multiplying the product of the two was required.
【０００４】[0004]
【課題を解決するための手段】本発明の第１の態様は、
リチウムイオン電池の劣化度判定装置において、リチウ
ムイオン電池を定電流方式で充電する充電部と、リチウ
ムイオン電池の端子間電圧を検出する電圧検出部と、上
記定電流方式での充電時に上記電圧検出部で検出される
端子間電圧の変化に基づいて、リチウムイオン電池の劣
化度を判定する判定部と、を備えたことを特徴とする。According to a first aspect of the present invention, there is provided:
A charging unit for charging the lithium ion battery by a constant current method, a voltage detection unit for detecting a voltage between terminals of the lithium ion battery, and the voltage detection unit for charging by the constant current method. A determination unit that determines the degree of deterioration of the lithium ion battery based on a change in the terminal voltage detected by the unit.
【０００５】本発明の第２の態様は、第１態様のリチウ
ムイオン電池の劣化度判定装置において、上記判定部
は、上記電圧検出部での検出電圧の変化を、基準となる
端子間電圧の変化と比較することにより、上記リチウム
イオン電池の劣化度を判定することを特徴とする。According to a second aspect of the present invention, in the lithium ion battery deterioration degree judging device according to the first aspect, the judging section judges a change in the voltage detected by the voltage detecting section as a reference inter-terminal voltage. The degree of deterioration of the lithium ion battery is determined by comparing the change with the change.
【０００６】本発明の第３の態様は、リチウムイオン電
池の劣化度判定装置において、リチウムイオン電池を定
電圧方式で充電する充電部と、リチウムイオン電池の充
電電流を検出する電流検出部と、上記定電圧方式での充
電時に上記電流検出部で検出される充電電流の変化に基
づいて、リチウムイオン電池の劣化度を判定する判定部
と、を備えたことを特徴とする。According to a third aspect of the present invention, in a lithium ion battery deterioration degree judging apparatus, a charging section for charging a lithium ion battery by a constant voltage method, a current detecting section for detecting a charging current of the lithium ion battery, A determination unit that determines a degree of deterioration of the lithium ion battery based on a change in the charging current detected by the current detection unit during the charging by the constant voltage method.
【０００７】本発明の第４の態様は、第３態様のリチウ
ムイオン電池の劣化度判定装置において、上記判定部
は、上記電流検出部での検出電流の変化を、基準となる
充電電流の変化と比較することにより、上記リチウムイ
オン電池の劣化度を判定することを特徴とする。According to a fourth aspect of the present invention, in the lithium ion battery deterioration degree judging device according to the third aspect, the judging section judges a change in the detection current in the current detection section as a reference change in the charging current. The deterioration degree of the lithium-ion battery is determined by comparing with.
【０００８】[0008]
【発明の実施の形態】以下、本発明の劣化度判定装置の
一実施形態を、図面を参照しながら説明する。図１に示
すように、劣化度判定装置は、従来の充電装置と同じ
く、リチウムイオン電池１を充電するための充電部１１
と、電圧検出部１２と、電流検出部１３とを備えてい
る。上記電圧検出部１２は、リチウムイオン電池１の端
子間電圧を検出する。上記電流検出部１３は、低抵抗値
の抵抗を有し、この抵抗での電圧降下を検出し、充電電
流情報として出力する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the deterioration degree determination device includes a charging unit 11 for charging the lithium ion battery 1 as in the conventional charging device.
, A voltage detector 12 and a current detector 13. The voltage detection unit 12 detects a voltage between terminals of the lithium ion battery 1. The current detection unit 13 has a low-resistance resistor, detects a voltage drop at the resistor, and outputs the detected voltage drop as charging current information.
【０００９】上記充電部１１は、図２に示すように、リ
チウムイオン電池１を定電流方式で充電する第１の充電
工程と、定電圧方式で充電する第２の充電工程を実行す
る。詳述すると、第１充電工程では、上記電流検出部１
３で検出される充電電流を一定電流Ｉｃに保つように、
充電電流をフィードバック制御する。第１充電工程にお
いて、定電流Ｉｃで充電をすると、充電量に応じて端子
間電圧が上昇していく。充電部１１は、電圧検出部１２
で検出される電圧が所定電圧Ｖｔ（後述する第２充電工
程での定電圧Ｖｃより若干低い電圧）に達した時に、第
１充電工程から第２充電工程に切り換える。As shown in FIG. 2, the charging section 11 executes a first charging step of charging the lithium ion battery 1 by a constant current method and a second charging step of charging the lithium ion battery 1 by a constant voltage method. More specifically, in the first charging step, the current detection unit 1
In order to keep the charging current detected at 3 at a constant current Ic,
Feedback control of charging current. In the first charging step, when charging is performed with the constant current Ic, the inter-terminal voltage increases according to the charged amount. The charging unit 11 includes a voltage detection unit 12
When the voltage detected in step (1) reaches a predetermined voltage Vt (a voltage slightly lower than a constant voltage Vc in a second charging step described later), the first charging step is switched to the second charging step.
【００１０】第２充電工程では、上記電圧検出部１２で
検出される端子間電圧を一定電圧Ｖｃに保つように、端
子間電圧（充電電圧）をフィードバック制御する。第２
充電工程において、定電圧Ｖｃで充電すると、充電量に
応じて充電電流が徐々に減少する。そして、電流検出部
１３で検出される充電電流が所定電流Ｉｔ（閾値）に達
した時に、充電を終了する。In the second charging step, the terminal voltage (charging voltage) is feedback-controlled so that the terminal voltage detected by the voltage detector 12 is maintained at a constant voltage Vc. Second
In the charging step, when charging is performed at the constant voltage Vc, the charging current gradually decreases according to the charged amount. Then, when the charging current detected by the current detecting unit 13 reaches a predetermined current It (threshold), the charging is terminated.
【００１１】本発明の劣化度判定装置は、上述した従来
の充電装置の構成に、リチウムイオン電池１の劣化度を
判定する判定部１５を付加したものである。この判定部
１５は、メモリおよびタイマを内蔵し、上記電圧検出部
１２からの検出電圧または電流検出部１３からの検出電
流の変化に基づいて、リチウムイオン電池１の劣化度を
判定し、判定結果を表示部１６に表示する。The deterioration degree judging device of the present invention is obtained by adding a judgment unit 15 for judging the degree of deterioration of the lithium ion battery 1 to the configuration of the conventional charging device described above. The determination unit 15 has a built-in memory and a timer, and determines the degree of deterioration of the lithium ion battery 1 based on a change in the detection voltage from the voltage detection unit 12 or the detection current from the current detection unit 13. Is displayed on the display unit 16.
【００１２】上記判定部１５の作用を詳述する前に、一
般的な電池の劣化について説明しておく。電池の劣化度
は基本的には放電容量の低下度合に対応する。放電容量
が負荷への電力供給能力を意味するからである。一般的
には、この放電容量が電池の初期状態と比較して所定割
合（例えば７０％）まで低下した時に、劣化度が限界に
達した、すなわち寿命が尽きたとされる。なお、電池寿
命が尽きるとは、電池が実際に使用不能となることを意
味せず、電池交換をする時期が来たことを意味し、しば
らくは使用可能である。Before describing the operation of the determination section 15 in detail, general battery deterioration will be described. The degree of battery deterioration basically corresponds to the degree of decrease in discharge capacity. This is because the discharge capacity means the ability to supply power to the load. Generally, when the discharge capacity decreases to a predetermined ratio (for example, 70%) as compared with the initial state of the battery, it is considered that the degree of deterioration has reached a limit, that is, the life has expired. Note that the expiration of the battery life does not mean that the battery is not actually usable, but means that it is time to replace the battery, and the battery can be used for a while.
【００１３】鉛電池，ニッケルーカドニウム電池，ニッ
ケルー水素電池など、電解液に酸あるいはアルカリ水溶
液を使用する電池の場合、陽極，陰極と電解液との間で
の酸化還元反応により充放電を行うため、充放電サイク
ルを繰り返すと、電極の劣化（不活化物質の生成）およ
び電解液の電気分解による劣化（電導度の低下）が避け
られない。したがって、上記充放電サイクルの回数が増
すに伴い、充電容量，放電容量も低下する。この水系電
解液の電池の充電容量，放電容量の低下のしかたを、図
４に示す。この図から明らかなように、充放電サイクル
の回数が増大するにつれて、充放電効率（＝放電容量／
充電容量）も低下していく。しかも、充放電サイクルが
不規則に行われた場合には、充放電効率の低下の仕方も
一定ではない（充電容量と放電容量との間に一定の関係
がない）。そのため、劣化度の判定に際しては、放電容
量または放電特性を検出することが要求される。In the case of a battery using an acid or alkaline aqueous solution as an electrolyte, such as a lead battery, a nickel-cadmium battery, and a nickel-hydrogen battery, charging and discharging are performed by an oxidation-reduction reaction between the anode, the cathode, and the electrolyte. When the charge and discharge cycle is repeated, deterioration of the electrode (generation of an inactivating substance) and deterioration due to electrolysis of the electrolytic solution (decrease in electric conductivity) are inevitable. Therefore, as the number of charge / discharge cycles increases, the charge capacity and the discharge capacity also decrease. FIG. 4 shows how the charge capacity and the discharge capacity of the battery using the aqueous electrolyte decrease. As is clear from this figure, as the number of charge / discharge cycles increases, the charge / discharge efficiency (= discharge capacity / discharge capacity /
Charging capacity) also decreases. In addition, when the charge / discharge cycle is performed irregularly, the way of decreasing the charge / discharge efficiency is not constant (there is no fixed relation between the charge capacity and the discharge capacity). Therefore, when determining the degree of deterioration, it is required to detect the discharge capacity or discharge characteristics.
【００１４】これに対して、リチウムイオン電池（非水
系電解液の電池）の場合には、陽極，陰極間でリチウム
イオンが移動することによってのみ、充放電を行うた
め、基本的に酸化還元反応に伴う劣化が発生せず、電解
液の電気分解によるイオン電導度の低下も有機溶媒のた
め基本的に発生しない。ただし、リチウムイオンが電極
に到達して金属リチウムが析出し、リチウムイオン総数
が減少するため、充放電サイクルを繰り返すことによ
り、充電容量，放電容量が低下する。On the other hand, in the case of a lithium ion battery (a battery using a non-aqueous electrolyte), charge and discharge are performed only by the movement of lithium ions between the anode and the cathode. No deterioration occurs due to the electrolysis of the electrolytic solution, and a decrease in ionic conductivity due to electrolysis is basically not caused by the organic solvent. However, since lithium ions reach the electrodes and metallic lithium precipitates, and the total number of lithium ions decreases, the charge capacity and the discharge capacity decrease by repeating the charge / discharge cycle.
【００１５】図３に示すように、リチウムイオン電池の
場合、充電容量と放電容量の低下がほぼ同様であるた
め、充放電効率は寿命末期までほぼ一定値に維持され、
しかも、不規則な充放電を繰り返しても、充電容量と放
電容量とは一定の関係を維持する。As shown in FIG. 3, in the case of a lithium ion battery, the charge capacity and the discharge capacity are almost the same, so that the charge / discharge efficiency is maintained at a substantially constant value until the end of life.
Moreover, even if the charge and discharge are repeated irregularly, the charge capacity and the discharge capacity maintain a constant relationship.
【００１６】本発明者は、上記リチウムイオン電池の充
放電による劣化特性に着目し、放電容量ではなく、これ
と一定の関係を有する充電容量を監視して、劣化度を判
定している。具体的には、充電容量と正確に対応する定
電流充電時の電圧変化または定電圧充電時の電流変化を
検出して、寿命を判定している。The present inventor pays attention to the deterioration characteristics of the lithium ion battery due to charge and discharge, and monitors the charge capacity having a certain relation with the discharge capacity instead of the discharge capacity to determine the degree of deterioration. Specifically, the life is determined by detecting a voltage change at the time of constant current charging or a current change at the time of constant voltage charging that exactly corresponds to the charging capacity.
【００１７】図２に示すように、リチウムイオン電池１
の充電時の端子間電圧，充電電流の変化の仕方は、電池
の初期状態（実線で示す）と、電池の劣化が進んだ状態
（破線で示す）では、異なる。第１の充電工程において
定電流Ｉｃで充電すると、電池の劣化が進んでいる場合
には充電容量が低下しているので、電圧の上昇が早くな
る（傾きが急になる）。第２の充電工程において定電圧
Ｖｃで充電すると、劣化度が進んでいる電池の場合に
は、充電電流の下降度合が大きくなる。As shown in FIG. 2, the lithium ion battery 1
The method of changing the inter-terminal voltage and the charging current during charging differs between the initial state of the battery (shown by a solid line) and the state of advanced battery deterioration (shown by a broken line). When the battery is charged with the constant current Ic in the first charging step, if the battery is deteriorating, the charging capacity is reduced, and the voltage rises faster (the slope becomes steeper). When the battery is charged with the constant voltage Vc in the second charging step, the degree of decrease in the charging current increases in the case of a battery whose deterioration degree has advanced.
【００１８】以下、判定部１５による劣化度判定の４つ
の態様を詳述する。なお、以下の説明において、α，
α’，β，β’は１を越える定数である。Hereinafter, four modes of the deterioration degree judgment by the judgment unit 15 will be described in detail. In the following description, α,
α ′, β, β ′ are constants exceeding 1.
【００１９】第１の態様 定電流方式で充電を行う第１充電工程において、電圧検
出部１２の検出電圧が上昇して第１の電圧Ｖａから第２
の電圧Ｖｂまで上昇する間の経過時間Δｔを計測し、こ
の計測時間を、予め記憶されている電池の初期状態での
基準経過時間Δｔ０と比較し、電池の劣化度を判定す
る。例えば、計測時間Δｔが基準経過時間Δｔ０の（１
／α）になった時に、電池寿命が尽きたと判定する。First Aspect In the first charging step of performing charging by the constant current method, the voltage detected by the voltage detecting section 12 rises and the second voltage is changed from the first voltage Va to the second voltage.
The elapsed time Δt during the rise to the voltage Vb is measured, and the measured time is compared with a previously stored reference elapsed time Δt0 in the initial state of the battery to determine the degree of deterioration of the battery. For example, the measurement time Δt is (1) of the reference elapsed time Δt0.
/ Α), it is determined that the battery life has expired.
【００２０】第２の態様 定電流方式で充電を行う第１充電工程において、電圧検
出部１２の検出電圧が上昇して予め決められた電圧Ｖｘ
に達した時点から所定期間（短時間でよい）経過するま
での電圧上昇値ΔＶを、予め記憶されている電池の初期
状態での基準電圧上昇値ΔＶ０と比較し、電池の劣化度
を判定する。例えば、計測された電圧上昇値ΔＶが基準
電圧上昇値ΔＶ０のα’倍になった時に、電池寿命が尽
きたと判定する。Second Embodiment In the first charging step of charging by the constant current method, the detection voltage of the voltage detection section 12 increases and the predetermined voltage Vx
Is compared with a reference voltage rise value ΔV0 stored in advance in the initial state of the battery to determine the degree of battery deterioration. . For example, when the measured voltage rise value ΔV becomes α ′ times the reference voltage rise value ΔV0, it is determined that the battery life has expired.
【００２１】第３の態様 定電圧方式で充電を行う第２充電工程において、電流検
出部１３の検出電流が下降して第１の電流Ｉａから第２
の電流Ｉｂまで下降する間の経過時間Δｔ’を計測し、
この計測時間Δｔ’を、予め記憶されている電池の初期
状態での基準経過時間Δｔ０’と比較し、電池の劣化度
を判定する。例えば、計測された経過時間が基準経過時
間の（１／β）になった時に、電池寿命が尽きたと判定
する。Third Aspect In the second charging step of performing charging by the constant voltage method, the current detected by the current detecting unit 13 falls to the second current from the first current Ia.
The elapsed time Δt ′ during the fall to the current Ib of
The measured time Δt ′ is compared with a reference elapsed time Δt0 ′ in the initial state of the battery stored in advance to determine the degree of deterioration of the battery. For example, when the measured elapsed time becomes (1 / β) of the reference elapsed time, it is determined that the battery life has expired.
【００２２】第４の態様 定電圧方式で充電を行う第２充電工程において、電流検
出部１３の検出電流が下降して予め決められた電流Ｉｘ
に達した時点からの所定期間（短時間でよい）経過する
までの電流下降値ΔＩを、予め記憶されている電池の初
期状態での基準電流下降値ΔＩ０と比較し、電池の劣化
度を判定する。例えば、計測された電流下降値ΔＩが基
準電流下降値ΔＩ０のβ’倍になった時に、電池寿命が
尽きたと判定する。Fourth Aspect In the second charging step of performing charging by the constant voltage method, the current detected by the current detecting unit 13 decreases and the predetermined current Ix
Is compared with a previously stored reference current decrease value ΔI0 in the initial state of the battery to determine the degree of deterioration of the battery. I do. For example, when the measured current drop value ΔI becomes β ′ times the reference current drop value ΔI0, it is determined that the battery life has expired.
【００２３】上記表示部１６では、電池寿命が尽きたと
の判定に応答して、電池交換を促す表示をする。上記４
つの態様の劣化度判定において、計測値と基準値を比較
し、その比に基づいて劣化度のレベルや残された充放電
回数や使用時間等を判定し、それを表示部１６で表示す
るようにしてもよい。また、基準値を劣化度が限界に達
した状態での値とし、これを閾値として計測値と比較し
てもよい。The display unit 16 displays a message prompting the user to replace the battery in response to the determination that the battery life has expired. 4 above
In the determination of the degree of deterioration in one of the modes, the measured value is compared with the reference value, and based on the ratio, the level of the degree of deterioration, the remaining number of times of charge / discharge, the use time, and the like are determined, and the result is displayed on the display unit 16. It may be. Alternatively, the reference value may be a value in a state where the degree of deterioration has reached the limit, and this may be compared with the measured value as a threshold value.
【００２４】上記判定部１５は、演算した劣化度に基づ
き、充電可能容量を算出し、この充電可能容量と予め記
憶されている充放電効率から放電可能容量を算出し、こ
れらを表示することもできる。The determination unit 15 calculates the chargeable capacity based on the calculated degree of deterioration, calculates the dischargeable capacity from the chargeable capacity and the charge / discharge efficiency stored in advance, and displays these. it can.
【００２５】[0025]
【発明の効果】以上説明したように、本発明では、リチ
ウムイオン電池の劣化特性に着目し、充電時に劣化度を
判定するようにしたので、放電時のように負荷を接続せ
ずに劣化度判定を行え、しかも、この判定を簡単に行え
る。すなわち、第１，第２の態様では、端子間電圧の変
化を検出して簡単に劣化度を判定でき、第３，第４の態
様では、充電電流の変化を検出して簡単に劣化度を判定
できる。As described above, in the present invention, the degree of deterioration is determined at the time of charging by paying attention to the deterioration characteristics of the lithium ion battery. Therefore, the degree of deterioration is determined without connecting a load as at the time of discharging. A determination can be made, and this determination can be made easily. That is, in the first and second aspects, the degree of deterioration can be easily determined by detecting a change in the voltage between terminals. In the third and fourth aspects, the degree of deterioration can be easily detected by detecting a change in the charging current. Can be determined.
【図１】本発明のリチウムイオン電池の劣化度判定装置
を示すブロック図である。FIG. 1 is a block diagram showing an apparatus for determining the degree of deterioration of a lithium ion battery according to the present invention.
【図２】リチウムイオン電池の充電の際の端子間電圧，
充電電流の変化を、初期状態と劣化が進んだ状態とを比
較して示す図である。FIG. 2 shows the voltage between terminals when charging a lithium ion battery,
It is a figure which shows the change of a charging current by comparing an initial state and the state which advanced.
【図３】リチウムイオン電池において、充放電サイクル
回数の増加に伴う充電容量，放電容量の変化を示す図で
ある。FIG. 3 is a diagram showing changes in charge capacity and discharge capacity with an increase in the number of charge / discharge cycles in a lithium ion battery.
【図４】水系電解液の電池において、充放電サイクル回
数の増加に伴う充電容量，放電容量の変化を示す図であ
る。FIG. 4 is a diagram showing changes in charge capacity and discharge capacity with an increase in the number of charge / discharge cycles in an aqueous electrolyte battery.
１１ 充電部 １２ 電圧検出部 １３ 電流検出部 １５ 判定部 DESCRIPTION OF SYMBOLS 11 Charge part 12 Voltage detection part 13 Current detection part 15 Judgment part
Claims (4)
る充電部と、 リチウムイオン電池の端子間電圧を検出する電圧検出部
と、 上記定電流方式での充電時に上記電圧検出部で検出され
る端子間電圧の変化に基づいて、リチウムイオン電池の
劣化度を判定する判定部と、 を備えたことを特徴とするリチウムイオン電池の劣化度
判定装置。A charging unit configured to charge a lithium ion battery by a constant current method; a voltage detection unit configured to detect a voltage between terminals of the lithium ion battery; A determination unit for determining the degree of deterioration of the lithium ion battery based on a change in the voltage between terminals, and a determination unit for determining the degree of deterioration of the lithium ion battery.
電圧の変化を、基準となる端子間電圧の変化と比較する
ことにより、上記リチウムイオン電池の劣化度を判定す
ることを特徴とする請求項１に記載のリチウムイオン電
池の劣化度判定装置。2. The method according to claim 1, wherein the determination unit determines a degree of deterioration of the lithium ion battery by comparing a change in the voltage detected by the voltage detection unit with a change in a reference voltage between terminals. The apparatus for determining a degree of deterioration of a lithium ion battery according to claim 1.
る充電部と、 リチウムイオン電池の充電電流を検出する電流検出部
と、 上記定電圧方式での充電時に上記電流検出部で検出され
る充電電流の変化に基づいて、リチウムイオン電池の劣
化度を判定する判定部と、 を備えたことを特徴とするリチウムイオン電池の劣化度
判定装置。A charging unit for charging the lithium ion battery by a constant voltage method; a current detection unit for detecting a charging current of the lithium ion battery; and a charge detected by the current detection unit when charging by the constant voltage method. A determining unit for determining a degree of deterioration of the lithium ion battery based on a change in current; and a determining unit for determining the degree of deterioration of the lithium ion battery.
電流の変化を、基準となる充電電流の変化と比較するこ
とにより、上記リチウムイオン電池の劣化度を判定する
ことを特徴とする請求項３に記載のリチウムイオン電池
の劣化度判定装置。4. The method according to claim 1, wherein the determination unit determines a degree of deterioration of the lithium ion battery by comparing a change in the detection current detected by the current detection unit with a change in a reference charging current. The apparatus for determining the degree of deterioration of a lithium ion battery according to claim 3.
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|---|---|---|---|
| JP2000102433A JP2001292534A (en) | 2000-04-04 | 2000-04-04 | Determining apparatus for deterioration of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000102433A JP2001292534A (en) | 2000-04-04 | 2000-04-04 | Determining apparatus for deterioration of lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| JP2001292534A true JP2001292534A (en) | 2001-10-19 |
Family
ID=18616316
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|---|---|---|---|
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| Country | Link |
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