JP3122751B2 - Battery remaining capacity determination method and determination device - Google Patents
Battery remaining capacity determination method and determination deviceInfo
- Publication number
- JP3122751B2 JP3122751B2 JP06188783A JP18878394A JP3122751B2 JP 3122751 B2 JP3122751 B2 JP 3122751B2 JP 06188783 A JP06188783 A JP 06188783A JP 18878394 A JP18878394 A JP 18878394A JP 3122751 B2 JP3122751 B2 JP 3122751B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- remaining capacity
- vehicle
- discharge current
- detecting
- Prior art date
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Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は頻繁に加減速を繰り返す
電気自動車等のバッテリ残存容量を正確に決定する方法
と装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for accurately determining a remaining battery capacity of an electric vehicle or the like which frequently repeats acceleration and deceleration.
【０００２】[0002]
【従来の技術】この種の残存容量決定装置として例えば
特開平５−１７２９１３号公報、特開昭６３−１５７０
７８号公報等には、バッテリからの瞬間放電電流とこの
時のバッテリ電圧よりバッテリの内部抵抗（ないし微分
内部抵抗）を算出し、これに基づいてバッテリ残存容量
を決定する装置が提案されている。2. Description of the Related Art For example, Japanese Patent Application Laid-Open No. 5-172913 and Japanese Patent Application Laid-Open No.
No. 78 proposes an apparatus that calculates the internal resistance (or differential internal resistance) of a battery from the instantaneous discharge current from the battery and the battery voltage at this time, and determines the remaining battery capacity based on this. .
【０００３】[0003]
【発明が解決しようとする課題】ところで、一般的には
図６に示すように、バッテリ内部抵抗とバッテリ残存容
量とは一義的な対応関係を有している。この対応関係は
図７に示す如く、所定の放電電流の下でのバッテリ電圧
値とバッテリ残存容量との間にも成立する。しかし、こ
れは測定直前のバッテリ放電電流が大きく変動していな
いことが条件であり、電気自動車における如く加減速を
頻繁に繰り返し、その都度充放電電流が大きく変動する
場合には、上記内部抵抗ないしバッテリ電圧値と残存容
量との対応関係は失われ、残存容量の決定に大きな誤差
を生じる。Generally, as shown in FIG. 6, the internal resistance of the battery and the remaining capacity of the battery have a unique correspondence. As shown in FIG. 7, this correspondence is also established between the battery voltage value under a predetermined discharge current and the remaining battery capacity. However, this is based on the condition that the battery discharge current immediately before the measurement does not fluctuate greatly. When the acceleration / deceleration is frequently repeated as in an electric vehicle, and the charge / discharge current fluctuates greatly each time, the internal resistance or The correspondence between the battery voltage value and the remaining capacity is lost, causing a large error in determining the remaining capacity.
【０００４】その理由は、バッテリ特有の分極現象によ
るものである。この分極現象は、バッテリの充放電によ
る電極反応に伴って電極近傍の電解液濃度が変化するこ
とによるもので、大きな放電電流が流れた場合には電極
近傍の電解液濃度が低下して、放電電流が小さかった場
合に比してバッテリの残存容量が等しくても検出される
バッテリ電圧値は低くなる。この結果、残存容量の決定
に誤差を生じるのである。また、放電電流の変化に対し
てバッテリ電圧は遅れを有して変化するため、放電電流
の変化が急峻であるとバッテリ電圧が追随できず、これ
によっても残存容量の決定に誤差が生じる。[0004] The reason for this is due to the polarization phenomenon peculiar to the battery. This polarization phenomenon is caused by a change in the concentration of the electrolyte near the electrodes due to the electrode reaction caused by the charging and discharging of the battery.When a large discharge current flows, the concentration of the electrolyte near the electrodes decreases and the discharge occurs. Even when the remaining capacity of the battery is equal, the detected battery voltage value is lower than when the current is small. As a result, an error occurs in the determination of the remaining capacity. Further, since the battery voltage changes with a delay with respect to the change in the discharge current, if the change in the discharge current is sharp, the battery voltage cannot follow the change, which also causes an error in the determination of the remaining capacity.
【０００５】本発明はかかる課題を解決するもので、バ
ッテリ分極等の影響を受けることなく、常に正確にバッ
テリの残存容量を決定することが可能なバッテリ残存容
量決定方法および決定装置を提供することを目的とす
る。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem, and provides a battery remaining capacity determination method and a determination device capable of always accurately determining the remaining capacity of a battery without being affected by battery polarization or the like. With the goal.
【０００６】[0006]
【課題を解決するための手段】請求項１の構成では、車
両の停車状態を確認し、その直後の車両加速状態におけ
るバッテリからの放電電流とこの時のバッテリ電圧を検
出して、これら放電電流とバッテリ電圧よりバッテリの
内部抵抗を算出して、この内部抵抗に基いて上記バッテ
リの残存容量を決定する。According to the first aspect of the present invention, a vehicle stopped state is confirmed, and a discharge current from the battery and a battery voltage in the vehicle acceleration state immediately after the stop state are detected. And the battery voltage is calculated from the battery voltage and the remaining capacity of the battery is determined based on the internal resistance.
【０００７】請求項２の構成では、図８に示す如く、車
両の停車状態を検出する停車検出手段と、車両加速状態
を検出する加速検出手段と、バッテリからの放電電流を
検出する電流検出手段と、バッテリ電圧を検出する電圧
検出手段と、車両停車直後の車両加速状態において検出
される上記放電電流とバッテリ電圧よりバッテリの内部
抵抗を算出する内部抵抗算出手段と、この内部抵抗に基
いて上記バッテリの残存容量を決定する残存容量決定手
段とを具備している。According to a second aspect of the present invention, as shown in FIG. 8, a vehicle stop detecting means for detecting a vehicle stop state, an acceleration detecting means for detecting a vehicle acceleration state, and a current detecting means for detecting a discharge current from a battery. Voltage detection means for detecting a battery voltage; internal resistance calculation means for calculating an internal resistance of the battery from the discharge current and the battery voltage detected in a vehicle acceleration state immediately after the vehicle is stopped; And a remaining capacity determining means for determining the remaining capacity of the battery.
【０００８】請求項３の構成では、車両の停車状態を確
認し、その直後の車両加速時におけるバッテリからの放
電電流とこの時のバッテリ電圧を検出して、所定の放電
電流下におけるバッテリ電圧の値より上記バッテリの残
存容量を決定する。According to the third aspect of the present invention, the vehicle stopped state is confirmed, and the discharge current from the battery and the battery voltage at the time of vehicle acceleration immediately after that are detected, and the battery voltage under the predetermined discharge current is detected. The remaining capacity of the battery is determined from the value.
【０００９】請求項４の構成では、図９に示す如く、車
両の停車状態を検出する停車検出手段と、車両加速状態
を検出する加速検出手段と、バッテリからの放電電流を
検出する電流検出手段と、バッテリ電圧を検出する電圧
検出手段と、車両停車直後の車両加速状態において検出
される所定の放電電流下におけるバッテリ電圧の値より
上記バッテリの残存容量を決定する残存容量決定手段と
を具備している。According to a fourth aspect of the present invention, as shown in FIG. 9, a vehicle stop detecting means for detecting a vehicle stop state, an acceleration detecting means for detecting a vehicle acceleration state, and a current detecting means for detecting a discharge current from a battery. Voltage detecting means for detecting the battery voltage; and remaining capacity determining means for determining the remaining capacity of the battery from a value of the battery voltage under a predetermined discharge current detected in a vehicle acceleration state immediately after the vehicle stops. ing.
【００１０】[0010]
【作用】請求項１〜４において、車両停車時には放電電
流は常に零であるから、その直後の加速時にバッテリ放
電電流とバッテリ電圧を検出すれば、バッテリ分極の影
響を受けることなく、常に再現性の良い放電電流とバッ
テリ電圧（ないし内部抵抗）の関係が得られる。これに
より、バッテリの残存容量を正確に決定することができ
る。また、車両停車直後の加速時における放電電流の変
化は、走行中の加速時の電流変化に比して緩慢であるか
ら、バッテリ電圧が良好に追従して変化し、これによっ
てもバッテリの残存容量に誤差が生じるのが回避され
る。Since the discharge current is always zero when the vehicle is stopped, if the battery discharge current and the battery voltage are detected immediately after acceleration, the reproducibility is not affected by the polarization of the battery. Good relationship between the discharge current and the battery voltage (or internal resistance) is obtained. Thus, the remaining capacity of the battery can be accurately determined. Also, since the change in the discharge current during acceleration immediately after the vehicle stops is slower than the change in current during acceleration during traveling, the battery voltage changes satisfactorily, which also causes the remaining capacity of the battery to change. Is avoided.
【００１１】[0011]
【実施例】図３に示すように車両速度が変化した場合、
車両の加減速に応じてバッテリの放電（充電）電流は図
４のように変化する。そこで、図３の１，２，３，４の
加速状態でのバッテリからの放電電流とこの時のバッテ
リ電圧を測定すると、図５に示すものとなる。図は放電
電流が１２０Ａ以上の時に、０．１秒毎に４秒間、電流
および電圧を測定したものである。図５より知られる如
く、車両加速状態でのバッテリ放電電流とバッテリ電圧
の関係は、バッテリの残存容量が同一でも、バッテリの
放電分極の影響により、測定直前のバッテリ放電電流の
変化量に応じて変動している。このうち、線２，線３，
線４は車両走行中に加速を行ったものであり、いずれも
測定直前に放電電流がほぼ垂直に立ち上がって急峻な変
化を示しているため、その変化量に応じて電流−電圧特
性が変動している。そして、その変動の程度は、測定直
前の走行状態に依存して一様ではない。DESCRIPTION OF THE PREFERRED EMBODIMENTS When the vehicle speed changes as shown in FIG.
The discharge (charge) current of the battery changes as shown in FIG. 4 according to the acceleration and deceleration of the vehicle. Then, when the discharge current from the battery and the battery voltage at this time in the acceleration states of 1, 2, 3, and 4 in FIG. The figure shows the current and voltage measured every 0.1 second for 4 seconds when the discharge current is 120 A or more. As is known from FIG. 5, the relationship between the battery discharge current and the battery voltage in the vehicle acceleration state depends on the amount of change in the battery discharge current immediately before the measurement due to the influence of the discharge polarization of the battery even when the remaining capacity of the battery is the same. Fluctuating. Of these, line 2, line 3,
The line 4 is obtained by accelerating while the vehicle is running. In each case, the discharge current rises almost perpendicularly and shows a steep change immediately before the measurement, so that the current-voltage characteristic fluctuates according to the amount of change. ing. Then, the degree of the fluctuation is not uniform depending on the running state immediately before the measurement.
【００１２】これに対して、線１は車両停車直後の加速
状態であり、この場合には測定前の放電電流は常に零か
ら直線的な変化を示し（図４）、非線形的に急変するこ
とはない。したがって、車両停車直後の加速時に放電電
流とバッテリ電圧の測定を行えば、バッテリの分極や電
圧変化の遅れの影響を受けることなく、常に再現性の良
い電流ー電圧特性を得ることができ、バッテリ残存容量
の正確な決定が可能である。以下、これを可能とする検
出方法および装置について説明する。On the other hand, the line 1 indicates an acceleration state immediately after the vehicle stops, in which case the discharge current before measurement always shows a linear change from zero (FIG. 4), and suddenly changes nonlinearly. There is no. Therefore, if the discharge current and the battery voltage are measured at the time of acceleration immediately after the vehicle stops, the current-voltage characteristics with good reproducibility can always be obtained without being affected by the polarization of the battery and the delay of the voltage change. An accurate determination of the remaining capacity is possible. Hereinafter, a detection method and an apparatus that enables this will be described.
【００１３】図１には残存容量決定装置のハード構成を
示し、バッテリ１からの給電により、モータ制御装置２
を介して図略のアクセル等の操作機器に応じた走行モー
タ３の運転制御がなされる。バッテリ１の給電線中に電
圧計４と電流計５が設けてあり、電圧信号と電流信号が
それぞれバッテリ残存容量計６に入力している。また、
バッテリ１の雰囲気温度を測定する温度計７が設けられ
て、その出力信号もバッテリ残存容量計６に入力してい
る。上記バッテリ残存容量計６はマイクロコンピュータ
を内蔵したもので、そのソフトウエアにより以下の処理
を行う。FIG. 1 shows a hardware configuration of a remaining capacity determination device.
The operation of the traveling motor 3 is controlled according to an operating device such as an accelerator (not shown) via the. A voltmeter 4 and an ammeter 5 are provided in a power supply line of the battery 1, and a voltage signal and a current signal are input to a battery remaining capacity meter 6, respectively. Also,
A thermometer 7 for measuring the ambient temperature of the battery 1 is provided, and its output signal is also input to the battery remaining capacity meter 6. The battery remaining capacity meter 6 has a built-in microcomputer and performs the following processing by its software.
【００１４】図２には処理フローチャートを示し、ステ
ップ１０１では上記電圧計４、電流計５よりそれぞれバ
ッテリ電圧とバッテリ電流を読み込むとともに、上記温
度計７より雰囲気温度を読み込む。続くステップ１０２
では車両停車後の加速状態にあるか判定する。車両停車
の判定は、測定電流が０Ａ（実際にはノイズ等の影響を
考慮して±５Ａ程度とする）である状態が数秒（例えば
１０秒）以上持続したことを確認することにより行う。
そして、その後の加速状態は上記測定電流値が漸次増加
することにより判定する。FIG. 2 shows a processing flowchart. In step 101, the battery voltage and the battery current are read from the voltmeter 4 and the ammeter 5, respectively, and the ambient temperature is read from the thermometer 7. Subsequent step 102
Then, it is determined whether the vehicle is in an acceleration state after stopping. The determination of vehicle stop is made by confirming that the state where the measured current is 0 A (actually, about ± 5 A in consideration of the influence of noise and the like) has been maintained for several seconds (for example, 10 seconds) or more.
Then, the subsequent acceleration state is determined by the measured current value gradually increasing.
【００１５】車両停車後の加速状態と判定されるとステ
ップ１０３で所定の時間間隔（例えば０．１秒）でこの
時の測定電流（放電電流）と測定電圧（バッテリ電圧）
を記憶する。この測定はステップ１０４で加速終了を判
定するまで続行する。加速終了は放電電流が減少を開始
したことにより判定する。When it is determined that the vehicle is accelerating after the vehicle stops, the measured current (discharge current) and measured voltage (battery voltage) at this time are determined at a predetermined time interval (for example, 0.1 second) in step 103.
Is stored. This measurement continues until it is determined in step 104 that the acceleration has ended. The end of acceleration is determined by the fact that the discharge current has started to decrease.
【００１６】ステップ１０５では、上記ステップ１０３
で測定し記憶された放電電流値とバッテリ電圧値に基づ
いてバッテリの内部抵抗を算出し、あるいは所定の放電
電流の下におけるバッテリ電圧値を得る。そして、続く
ステップ１０６において、図６に示す内部抵抗とバッテ
リ残存容量、あるいは図７に示すバッテリ電圧値とバッ
テリ残存容量のデータテーブルを参照してバッテリ残存
容量を決定し、ステップ１０７でこれを表示する。In step 105, the above-mentioned step 103
Calculates the internal resistance of the battery based on the discharge current value and the battery voltage value measured and stored in the above, or obtains the battery voltage value under a predetermined discharge current. Then, in the subsequent step 106, the battery remaining capacity is determined by referring to the data table of the internal resistance and the remaining battery capacity shown in FIG. 6 or the battery voltage value and the remaining battery capacity shown in FIG. 7, and displayed in step 107. I do.
【００１７】以上の処理はステップ１０８でイグニショ
ンスイッチの非投入が検出されるまで続行される。な
お、次回の停車直後の加速状態が現れる間は、この決定
されたバッテリ残存容量に対して、図略の処理手順によ
り充放電電流の積算値（充電電流は＋、放電電流は−）
を上記残存容量に加え、連続的なバッテリ残存容量の表
示を行っても良い。The above processing is continued until it is detected in step 108 that the ignition switch is not turned on. During the acceleration state immediately after the next stop, the integrated value of the charging / discharging current (charging current is + and discharging current is-) is calculated for the determined remaining battery capacity according to an unillustrated processing procedure.
May be added to the remaining capacity to display a continuous battery remaining capacity.
【００１８】[0018]
【発明の効果】以上の如く、本発明のバッテリ残存容量
決定方法および決定装置によれば、バッテリの充電分極
等の影響を受けることなく常に正確にバッテリの残存容
量を決定することができ、頻繁に充放電電流が変化する
電気自動車等の搭載バッテリの充電必要時期を正確に知
ることができる。As described above, according to the battery remaining capacity determination method and determination apparatus of the present invention, it is possible to always accurately determine the remaining capacity of the battery without being affected by the charge polarization of the battery. Thus, it is possible to accurately know the time required for charging the on-board battery of an electric vehicle or the like whose charge / discharge current changes.
【図１】本発明の装置構成を示すブロック図である。FIG. 1 is a block diagram showing a device configuration of the present invention.
【図２】処理手順を示すプログラムフローチャートであ
る。FIG. 2 is a program flowchart showing a processing procedure.
【図３】車両の運転速度の時間変化を示すグラフであ
る。FIG. 3 is a graph showing a time change of a driving speed of a vehicle.
【図４】車両運転時のバッテリ電流の時間変化を示すグ
ラフである。FIG. 4 is a graph showing a time change of a battery current during vehicle operation.
【図５】車両加速時の電流−電圧特性を示すグラフであ
る。FIG. 5 is a graph showing current-voltage characteristics during vehicle acceleration.
【図６】バッテリ残存容量と内部抵抗の関係を示すグラ
フである。FIG. 6 is a graph showing the relationship between the remaining battery capacity and the internal resistance.
【図７】バッテリ残存容量とバッテリ電圧値の関係を示
すグラフである。FIG. 7 is a graph showing a relationship between a remaining battery capacity and a battery voltage value.
【図８】クレーム対応図である。FIG. 8 is a diagram corresponding to claims.
【図９】クレーム対応図である。FIG. 9 is a diagram corresponding to claims.
１ バッテリ ３ モータ ４ 電圧計 ５ 電流計 ６ バッテリ残存容量計 1 Battery 3 Motor 4 Voltmeter 5 Ammeter 6 Battery remaining capacity meter
───────────────────────────────────────────────────── フロントページの続き (72)発明者 内田 光宣 愛知県西尾市下羽角町岩谷14番地 株式 会社日本自動車部品総合研究所内 (72)発明者 牧野 太輔 愛知県西尾市下羽角町岩谷14番地 株式 会社日本自動車部品総合研究所内 (72)発明者 加藤 豪俊 愛知県刈谷市昭和町１丁目１番地 日本 電装株式会社内 (72)発明者 佐々木 虎彦 愛知県豊田市トヨタ町１番地 トヨタ自 動車株式会社内 (56)参考文献 特開 平７−294611（ＪＰ，Ａ) 特開 平６−34727（ＪＰ，Ａ) 特開 平５−172913（ＪＰ，Ａ) 特開 平２−151783（ＪＰ，Ａ) 特開 昭63−157078（ＪＰ，Ａ) 特開 昭62−237370（ＪＰ，Ａ) 特開 昭56−126776（ＪＰ，Ａ) 特開 平６−59003（ＪＰ，Ａ) 特開 昭63−261179（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01R 31/36 B60R 16/04 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsunori Uchida 14 Iwatani, Shimowakaku-cho, Nishio-shi, Aichi Prefecture Inside the Japan Automobile Parts Research Institute (72) Inventor Tasuke Makino 14-Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Japan Inside the Automobile Parts Research Laboratory (72) Inventor Taketoshi Kato 1-1-1 Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (72) Inventor Torahiko Sasaki 1-Toyota-cho, Toyota-shi, Aichi Prefecture Inside Toyota Motor Corporation ( 56) References JP-A-7-294611 (JP, A) JP-A-6-34727 (JP, A) JP-A-5-172913 (JP, A) JP-A-2-151178 (JP, A) JP JP-A-63-157078 (JP, A) JP-A-62-237370 (JP, A) JP-A-56-126776 (JP, A) JP-A-6-59003 (JP, A) JP-A-63-261179 (JP JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) G01R 31/36 B60R 16/04
Claims (4)
両加速状態におけるバッテリからの放電電流とこの時の
バッテリ電圧を検出して、これら放電電流とバッテリ電
圧よりバッテリの内部抵抗を算出して、この内部抵抗に
基いて上記バッテリの残存容量を決定することを特徴と
するバッテリ残存容量決定方法。The present invention detects a vehicle stop state, detects a discharge current from a battery in a vehicle acceleration state immediately after the vehicle stop state, and detects a battery voltage at this time, and calculates an internal resistance of the battery from the discharge current and the battery voltage. And determining the remaining capacity of the battery based on the internal resistance.
と、車両加速状態を検出する加速検出手段と、バッテリ
からの放電電流を検出する電流検出手段と、バッテリ電
圧を検出する電圧検出手段と、車両停車直後の車両加速
状態において検出される上記放電電流とバッテリ電圧よ
りバッテリの内部抵抗を算出する内部抵抗算出手段と、
この内部抵抗に基いて上記バッテリの残存容量を決定す
る残存容量決定手段とを具備するバッテリ残存容量決定
装置。2. A vehicle stop detecting means for detecting a vehicle stop state, an acceleration detecting means for detecting a vehicle acceleration state, a current detecting means for detecting a discharge current from a battery, and a voltage detecting means for detecting a battery voltage. Internal resistance calculation means for calculating the internal resistance of the battery from the discharge current and the battery voltage detected in the vehicle acceleration state immediately after the vehicle stops,
A battery remaining capacity determination device comprising: a remaining capacity determination unit that determines the remaining capacity of the battery based on the internal resistance.
両加速時におけるバッテリからの放電電流とこの時のバ
ッテリ電圧を検出して、所定の放電電流下におけるバッ
テリ電圧の値より上記バッテリの残存容量を決定するこ
とを特徴とするバッテリ残存容量の決定方法。3. A stopped state of the vehicle is confirmed, a discharge current from the battery immediately after vehicle acceleration and a battery voltage at this time are detected, and the battery voltage of the battery under a predetermined discharge current is detected. A method for determining a remaining capacity of a battery, comprising determining a remaining capacity.
と、車両加速状態を検出する加速検出手段と、バッテリ
からの放電電流を検出する電流検出手段と、バッテリ電
圧を検出する電圧検出手段と、車両停車直後の車両加速
状態において検出される所定の放電電流下におけるバッ
テリ電圧の値より上記バッテリの残存容量を決定する残
存容量決定手段とを具備するバッテリ残存容量決定装
置。4. A vehicle stop detecting means for detecting a vehicle stop state, an acceleration detecting means for detecting a vehicle acceleration state, a current detecting means for detecting a discharge current from a battery, and a voltage detecting means for detecting a battery voltage. And a remaining capacity determining means for determining a remaining capacity of the battery from a value of a battery voltage under a predetermined discharge current detected in a vehicle acceleration state immediately after the vehicle stops.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06188783A JP3122751B2 (en) | 1994-07-18 | 1994-07-18 | Battery remaining capacity determination method and determination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06188783A JP3122751B2 (en) | 1994-07-18 | 1994-07-18 | Battery remaining capacity determination method and determination device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0829506A JPH0829506A (en) | 1996-02-02 |
| JP3122751B2 true JP3122751B2 (en) | 2001-01-09 |
Family
ID=16229720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06188783A Expired - Fee Related JP3122751B2 (en) | 1994-07-18 | 1994-07-18 | Battery remaining capacity determination method and determination device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3122751B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3817141B2 (en) * | 2000-12-05 | 2006-08-30 | 矢崎総業株式会社 | Deterioration degree determination method and apparatus for vehicle battery |
| US7688075B2 (en) * | 2005-04-20 | 2010-03-30 | Sion Power Corporation | Lithium sulfur rechargeable battery fuel gauge systems and methods |
| JP7231801B2 (en) * | 2019-03-22 | 2023-03-02 | Fdk株式会社 | OCV characteristic estimation method and OCV characteristic estimation device |
-
1994
- 1994-07-18 JP JP06188783A patent/JP3122751B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0829506A (en) | 1996-02-02 |
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