JP3426019B2 - Method and apparatus for estimating remaining capacity of Ni-MH battery - Google Patents
Method and apparatus for estimating remaining capacity of Ni-MH batteryInfo
- Publication number
- JP3426019B2 JP3426019B2 JP04819994A JP4819994A JP3426019B2 JP 3426019 B2 JP3426019 B2 JP 3426019B2 JP 04819994 A JP04819994 A JP 04819994A JP 4819994 A JP4819994 A JP 4819994A JP 3426019 B2 JP3426019 B2 JP 3426019B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- remaining capacity
- current
- hydrogen gas
- correlation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Description
【０００１】[0001]
【産業上の利用分野】本発明は、Ｎｉ−ＭＨ（ニッケル
−メタルハイドライド）バッテリの残容量を推定する方
法及びその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for estimating the remaining capacity of a Ni-MH (nickel-metal hydride) battery.
【０００２】[0002]
【従来の技術】近年、充電可能な二次電池の一つである
Ｎｉ−ＭＨバッテリは、高容量である、充放電性能がよ
い、クリーンである等の理由により、各種民生用機器の
二次電池として注目されている。2. Description of the Related Art In recent years, Ni-MH batteries, which are one of rechargeable secondary batteries, are secondary batteries for various consumer devices because of their high capacity, good charge / discharge performance, cleanliness, and the like. It is attracting attention as a battery.
【０００３】この種の二次電池（以下、単にバッテリと
いう）においては、充電時期あるいは電池状態を使用者
に認識させること等を目的として、何等かの手法により
現在の残容量を推定することが重要であり、その手法と
しては、従来、バッテリの残容量が判明している初期状
態（例えば新品の満充電状態）から充分短いサンプリン
グタイム毎に放電電流及び充電電流を測定して、これを
積算することにより、現時点までの総放電量及び総充電
量を求め、その求めた総放電量及び総充電量をそれぞれ
初期の容量から減算及び加算することにより、現時点の
残容量を推定する手法が一般に知られている。In this type of secondary battery (hereinafter, simply referred to as a battery), the current remaining capacity can be estimated by some method for the purpose of making the user recognize the charging time or the battery state. It is important to measure the discharge current and charge current at each sufficiently short sampling time from the initial state (for example, a fully charged state of a new battery) where the remaining capacity of the battery is known, and then integrates this. By calculating the total discharge amount and the total charge amount up to the present time, and by subtracting and adding the calculated total discharge amount and the total charge amount from the initial capacity respectively, a method of estimating the remaining capacity at the present time is generally used. Are known.
【０００４】しかしながら、かかる手法にあっては、放
電電流及び充電電流の測定値を積算するため、その測定
値の誤差が蓄積されてしまう。このため、電流を検出す
る電流センサが高精度なものでないと、残容量を精度よ
く推定することができず、また、高精度な電流センサを
使用した場合には、高価なものとなるという不都合があ
った。However, in such a method, since the measured values of the discharge current and the charge current are integrated, errors in the measured values are accumulated. For this reason, the remaining capacity cannot be accurately estimated unless the current sensor that detects the current is highly accurate, and when a highly accurate current sensor is used, it becomes expensive. was there.
【０００５】[0005]
【発明が解決しようとする課題】本発明はＮｉ−ＭＨバ
ッテリについて、その残容量の推定手法の改良を目的と
し、具体的には、Ｎｉ−ＭＨバッテリの充放電電流を検
出せずとも、容易且つ簡単な構成で残容量を推定するこ
とができる残容量推定方法及びその装置を提供すること
を目的とする。また、Ｎｉ−ＭＨバッテリの残容量を充
電時と放電時とのいずれにおいても推定することができ
る残容量推定方法及びその装置を提供することを目的と
する。SUMMARY OF THE INVENTION The present invention aims to improve the method of estimating the remaining capacity of a Ni-MH battery. Specifically, it is easy to detect the charging / discharging current of the Ni-MH battery. It is also an object of the present invention to provide a remaining capacity estimation method and apparatus capable of estimating the remaining capacity with a simple configuration. It is another object of the present invention to provide a remaining capacity estimation method and apparatus capable of estimating the remaining capacity of a Ni-MH battery both during charging and during discharging.
【０００６】[0006]
【課題を解決するための手段】本発明の発明者等は、Ｎ
ｉ−ＭＨバッテリについて種々の検討を行った結果、Ｎ
ｉ−ＭＨバッテリの充放電を行うと、該バッテリの内圧
（ガス圧）の平衡圧が変化し、このとき、該バッテリの
内圧の平衡圧と残容量との間には一定の相関関係がある
ということを知見した。また、本発明の発明者等は、Ｎ
ｉ−ＭＨバッテリの内部に存在するガスは窒素ガス、水
素ガス及び酸素ガスであるが、これらのガスによるバッ
テリの内圧は、任意の残容量において特に水素ガスの分
圧あるいは水素ガスの濃度に依存するということを知見
した。さらに、本発明の発明者等は、Ｎｉ−ＭＨバッテ
リの内圧の平衡圧と残容量との間の相関関係は、該バッ
テリの充電時と放電時とで相違するということを知見し
た。The inventors of the present invention have
As a result of various studies on the i-MH battery, N
When the i-MH battery is charged and discharged, the equilibrium pressure of the internal pressure (gas pressure) of the battery changes, and at this time, there is a certain correlation between the equilibrium pressure of the internal pressure of the battery and the remaining capacity. I found out that. In addition, the inventors of the present invention
The gases existing inside the i-MH battery are nitrogen gas, hydrogen gas and oxygen gas, but the internal pressure of the battery due to these gases depends on the partial pressure of hydrogen gas or the concentration of hydrogen gas at any remaining capacity. I found out that Furthermore, the inventors of the present invention have found that the correlation between the equilibrium pressure of the internal pressure of the Ni-MH battery and the remaining capacity is different between when the battery is charged and when it is discharged.
【０００７】そこで、本発明のＮｉ−ＭＨバッテリの残
容量推定方法は、前記の目的を達成するために、Ｎｉ−
ＭＨバッテリの現在の内圧を測定する工程と、該内圧と
前記バッテリの残容量とのあらかじめ設定された相関関
係に基づいて前記測定により得られたバッテリの現在の
内圧に対応する残容量を求め、その求めた残容量を前記
バッテリの現在の残容量として推定する工程とから成る
ことを特徴とする。Therefore, the method for estimating the remaining capacity of the Ni-MH battery according to the present invention is provided in order to achieve the above object.
Measuring the current internal pressure of the MH battery, and determining a residual capacity corresponding to the current internal pressure of the battery obtained by the measurement based on a preset correlation between the internal pressure and the residual capacity of the battery, The step of estimating the obtained remaining capacity as the current remaining capacity of the battery.
【０００８】あるいは、Ｎｉ−ＭＨバッテリの現在の水
素ガス圧を測定する工程と、該水素ガス圧と前記バッテ
リの残容量とのあらかじめ設定された相関関係に基づい
て前記測定により得られたバッテリの現在の水素ガス圧
に対応する残容量を求め、その求めた残容量を前記バッ
テリの現在の残容量として推定する工程とから成ること
を特徴とする。Alternatively, the step of measuring the current hydrogen gas pressure of the Ni-MH battery and the battery obtained by the measurement based on the preset correlation between the hydrogen gas pressure and the remaining capacity of the battery are measured. And a step of obtaining a remaining capacity corresponding to the current hydrogen gas pressure and estimating the obtained remaining capacity as the current remaining capacity of the battery.
【０００９】あるいは、Ｎｉ−ＭＨバッテリの現在の水
素ガス濃度を測定する工程と、該水素ガス濃度と前記バ
ッテリの残容量とのあらかじめ設定された相関関係に基
づいて前記測定により得られたバッテリの現在の水素ガ
ス濃度に対応する残容量を求め、その求めた残容量を前
記バッテリの現在の残容量として推定する工程とから成
ることを特徴とする。Alternatively, the step of measuring the current hydrogen gas concentration of the Ni-MH battery and the battery obtained by the measurement based on the preset correlation between the hydrogen gas concentration and the remaining capacity of the battery Determining the remaining capacity corresponding to the current hydrogen gas concentration, and estimating the remaining capacity thus determined as the current remaining capacity of the battery.
【００１０】さらに、前記相関関係は、前記バッテリの
充電時と放電時とで各別に設定したことを特徴とする。Further, the correlation is set separately when the battery is charged and when it is discharged.
【００１１】また、本発明のＮｉ−ＭＨバッテリの残容
量推定装置は、前記の目的を達成するために、Ｎｉ−Ｍ
Ｈバッテリの現在の内圧を検出する圧力検出手段と、該
内圧と前記バッテリの残容量とのあらかじめ設定された
相関関係を記憶保持する記憶手段と、該記憶保持手段に
記憶保持された前記相関関係に基づいて前記測定により
得られたバッテリの現在の内圧に対応する残容量を求
め、その求めた残容量を前記バッテリの現在の残容量と
して推定する残容量推定手段とを備えたことを特徴とす
る。The remaining capacity estimating apparatus for a Ni-MH battery according to the present invention is provided to achieve the above object.
H pressure detection means for detecting the current internal pressure of the battery, storage means for storing and holding a preset correlation between the internal pressure and the remaining capacity of the battery, and the correlation stored and held in the storage holding means A remaining capacity corresponding to the current internal pressure of the battery obtained by the measurement based on the above, and the remaining capacity estimation means for estimating the obtained remaining capacity as the current remaining capacity of the battery. To do.
【００１２】あるいは、Ｎｉ−ＭＨバッテリの現在の水
素ガス圧を検出する圧力検出手段と、該水素ガス圧と前
記バッテリの残容量とのあらかじめ設定された相関関係
を記憶保持する記憶手段と、該記憶保持手段に記憶保持
された前記相関関係に基づいて前記測定により得られた
バッテリの現在の水素ガス圧に対応する残容量を求め、
その求めた残容量を前記バッテリの現在の残容量として
推定する残容量推定手段とを備えたことを特徴とする。Alternatively, pressure detecting means for detecting the current hydrogen gas pressure of the Ni-MH battery, storage means for storing and holding a preset correlation between the hydrogen gas pressure and the remaining capacity of the battery, and The remaining capacity corresponding to the current hydrogen gas pressure of the battery obtained by the measurement based on the correlation stored and held in the memory holding means,
A remaining capacity estimating means for estimating the obtained remaining capacity as the current remaining capacity of the battery is provided.
【００１３】あるいは、Ｎｉ−ＭＨバッテリの現在の水
素ガス濃度を検出する濃度検出手段と、該水素ガス濃度
と前記バッテリの残容量とのあらかじめ設定された相関
関係を記憶保持する記憶手段と、該記憶保持手段に記憶
保持された前記相関関係に基づいて前記測定により得ら
れたバッテリの現在の水素ガス濃度に対応する残容量を
求め、その求めた残容量を前記バッテリの現在の残容量
として推定する残容量推定手段とを備えたことを特徴と
する。Alternatively, a concentration detecting means for detecting the current hydrogen gas concentration of the Ni-MH battery, a storage means for storing and retaining a preset correlation between the hydrogen gas concentration and the remaining capacity of the battery, and A remaining capacity corresponding to the current hydrogen gas concentration of the battery obtained by the measurement is obtained based on the correlation stored and held in the storage means, and the obtained remaining capacity is estimated as the current remaining capacity of the battery. And a remaining capacity estimating means for performing the operation.
【００１４】さらに、前記バッテリが充電時であるか放
電時であるかを検出する充放電検出手段を備え、前記記
憶手段に記憶保持された前記相関関係は前記バッテリの
充電時と放電時とで各別に設定され、前記残容量推定手
段は、前記充放電検出手段により検出された充放電に対
応する相関関係に基づいて前記バッテリの現在の残容量
を推定することを特徴とする。Further, a charging / discharging detection means for detecting whether the battery is charging or discharging is provided, and the correlation stored in the storage means is stored between the charging and discharging of the battery. The remaining capacity estimation unit is set separately, and estimates the current remaining capacity of the battery based on the correlation corresponding to the charge / discharge detected by the charge / discharge detection unit.
【００１５】尚、前記相関関係は、例えばマップやテー
ブルを用いて設定し、あるいは該相関関係を近似する近
似式を用いて設定すればよい。The correlation may be set using, for example, a map or a table, or may be set using an approximate expression that approximates the correlation.
【００１６】[0016]
【作用】本発明の残容量推定方法によれば、前述したよ
うに、前記Ｎｉ−ＭＨバッテリの内圧の平衡圧と残容量
との間には、一定の相関関係があるので、該相関関係を
マップやテーブル、あるいは近似式を用いてあらかじめ
設定しておくことで、該バッテリの内圧を測定すれば、
その内圧の測定値から前記相関関係に基づいてバッテリ
の残容量を推定することが可能となる。According to the remaining capacity estimating method of the present invention, as described above, there is a certain correlation between the balance pressure of the internal pressure of the Ni-MH battery and the remaining capacity. If the internal pressure of the battery is measured by setting in advance using a map, table, or approximate expression,
It is possible to estimate the remaining capacity of the battery from the measured value of the internal pressure based on the correlation.
【００１７】また、前述したように、Ｎｉ−ＭＨバッテ
リの内圧は、該バッテリの内部に存在する水素ガスの分
圧あるいは濃度に依存する傾向があるので、該バッテリ
の水素ガス圧あるいは水素ガス濃度と残容量との間にも
一定の相関関係がある。従って、その相関関係をあらか
じめ設定しておくことで、該バッテリの水素ガス圧ある
いは水素ガス濃度を測定すれば、その測定値から前記相
関関係に基づいてバッテリの残容量を推定することが可
能となる。Further, as described above, the internal pressure of the Ni-MH battery tends to depend on the partial pressure or the concentration of the hydrogen gas existing inside the battery, so that the hydrogen gas pressure or the hydrogen gas concentration of the battery is high. There is also a certain correlation between and the remaining capacity. Therefore, by setting the correlation in advance and measuring the hydrogen gas pressure or the hydrogen gas concentration of the battery, it is possible to estimate the remaining capacity of the battery from the measured value based on the correlation. Become.
【００１８】さらに、前述したように、Ｎｉ−ＭＨバッ
テリの内圧と残容量との間の相関関係は、該バッテリの
充電時と放電時とで相違する傾向があるので、充電時と
放電時とで各別に内圧と残容量との間の相関関係を設定
し、充電時と放電時とで各別の相関関係を用いて内圧の
測定値から残容量を推定することで、残容量の検出制度
を高めることが可能となる。尚、このことは、バッテリ
の内圧に対応する水素ガス圧あるいは水素ガス濃度と残
容量との相関関係を用いてバッテリの残容量を推定する
場合も同様である。Further, as described above, the correlation between the internal pressure and the remaining capacity of the Ni-MH battery tends to be different when the battery is charged and when it is discharged. By setting the correlation between the internal pressure and the remaining capacity for each, and estimating the remaining capacity from the measured value of the internal pressure using the different correlation during charging and discharging, the remaining capacity detection system It becomes possible to raise. This also applies to the case where the remaining capacity of the battery is estimated by using the correlation between the hydrogen gas pressure or the hydrogen gas concentration corresponding to the internal pressure of the battery and the remaining capacity.
【００１９】また、本発明の残容量推定装置によれば、
Ｎｉ−ＭＨバッテリの内圧あるいは水素ガス圧あるいは
水素ガス濃度と残容量との相関関係をあらかじめマップ
やテーブル、近似式等により記憶手段に記憶保持してお
く共に、バッテリの内圧あるいは水素ガス圧あるいは水
素ガス濃度を圧力検出手段や濃度検出手段により検出
し、その検出値と記憶手段に記憶保持された相関関係と
からバッテリの残容量を推定することにより、前記残容
量推定方法に従って、簡単な構成で容易にバッテリの残
容量を推定することが可能となる。According to the remaining capacity estimating apparatus of the present invention,
The internal pressure of the Ni-MH battery or the hydrogen gas pressure or the correlation between the hydrogen gas concentration and the remaining capacity is stored in the storage means in advance by a map, a table, an approximate expression or the like, and the internal pressure of the battery or the hydrogen gas pressure or hydrogen is also stored. The gas concentration is detected by the pressure detection means or the concentration detection means, and the remaining capacity of the battery is estimated from the detected value and the correlation stored in the storage means. It is possible to easily estimate the remaining capacity of the battery.
【００２０】さらに、前記バッテリが充電時であるか放
電時であるかを検出する充放電検出手段を備えると共
に、前記記憶手段に記憶保持した相関関係をバッテリの
充電時と放電時とで各別に設定しておくことにより、バ
ッテリの充電時と放電時とで各別の相関関係を用いてバ
ッテリの残容量を推定することが可能となり、簡単な構
成でバッテリの残容量の検出制度を高めることが可能と
なる。Further, a charging / discharging detection means for detecting whether the battery is charging or discharging is provided, and the correlation stored in the storage means is separately stored for charging and discharging of the battery. By setting it, it becomes possible to estimate the remaining capacity of the battery by using the different correlations when the battery is charged and when it is discharged, and the detection accuracy of the remaining capacity of the battery can be improved with a simple configuration. Is possible.
【００２１】[0021]
【実施例】本発明の一実施例を図１及び図２を参照して
説明する。図１は本実施例の残容量推定装置のシステム
構成図、図２は図１の装置の作動を説明するための線図
である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram of the remaining capacity estimation device of the present embodiment, and FIG. 2 is a diagram for explaining the operation of the device of FIG.
【００２２】図１を参照して、１はＮｉ−ＭＨバッテ
リ、２はバッテリ１の内圧（内部のガス圧）を検出する
圧力センサ（圧力検出手段）、３は圧力センサ２により
検出されるバッテリ１の内圧等を基にバッテリ１の残容
量の推定処理を行うコントローラ、４はコントローラ３
により得られた残容量の推定値を表示する表示器であ
る。Referring to FIG. 1, 1 is a Ni-MH battery, 2 is a pressure sensor (pressure detecting means) for detecting the internal pressure (internal gas pressure) of the battery 1, and 3 is a battery detected by the pressure sensor 2. A controller 4 for estimating the remaining capacity of the battery 1 based on the internal pressure of 1 and the like 4 is a controller 3
It is a display that displays the estimated value of the remaining capacity obtained by.
【００２３】バッテリ１は、例えば定格容量２５Ａｈの
ものであり、該バッテリ１には、抵抗５及びスイッチ６
を介して負荷７が接続されると共に、抵抗５及びスイッ
チ８を介して充電器９が接続されている。この場合、ス
イッチ６を投入することにより、バッテリ１は抵抗５を
介して負荷７に放電し、スイッチ８を投入することによ
り、バッテリ１は充電器９から抵抗５を介して充電され
る。The battery 1 has, for example, a rated capacity of 25 Ah. The battery 1 includes a resistor 5 and a switch 6
The load 7 is connected via the resistor 5 and the charger 9 is connected via the resistor 5 and the switch 8. In this case, by turning on the switch 6, the battery 1 is discharged to the load 7 via the resistor 5, and by turning on the switch 8, the battery 1 is charged from the charger 9 via the resistor 5.
【００２４】コントローラ３は、マイクロコンピュータ
等により構成されたものであり、バッテリ１の充電時及
び放電時に前記抵抗５に生じる電圧を入力として、その
電圧の極性により該バッテリ１の充電時であるか放電時
であるかを検出する充放電検出部１０と、バッテリ１の
内圧と残容量とのあらかじめ定められた相関関係（詳細
は後述する）を記憶保持した記憶部１１（記憶手段）
と、圧力センサ２により検出されるバッテリ１の内圧と
充放電検出部１０により検出されたバッテリ１の充放電
状態と記憶部１１に記憶保持された相関関係とを基にバ
ッテリ１の現在の残容量を推定する残容量推定部１２
（残容量推定手段）とを備えている。この場合、充放電
検出部１０は抵抗５と併せて充放電検出手段１３を構成
する。The controller 3 is composed of a microcomputer or the like, and the voltage generated in the resistor 5 at the time of charging and discharging the battery 1 is used as an input, and whether the battery 1 is being charged depending on the polarity of the voltage. A charging / discharging detection unit 10 that detects whether or not discharging is in progress, and a storage unit 11 (storage unit) that stores and holds a predetermined correlation (details will be described later) between the internal pressure and the remaining capacity of the battery 1.
Based on the internal pressure of the battery 1 detected by the pressure sensor 2, the charge / discharge state of the battery 1 detected by the charge / discharge detection unit 10, and the correlation stored and held in the storage unit 11. Remaining capacity estimation unit 12 for estimating capacity
(Remaining capacity estimation means). In this case, the charge / discharge detection unit 10 constitutes the charge / discharge detection means 13 together with the resistor 5.
【００２５】尚、バッテリ１の充放電状態の検出は、例
えば前記スイッチ６，８のＯＮ・ＯＦＦを検出し、これ
によりバッテリ１の充電時であるか放電時であるかを検
出するようにしてもよい。The charging / discharging state of the battery 1 is detected, for example, by detecting ON / OFF of the switches 6 and 8 and thereby detecting whether the battery 1 is being charged or discharged. Good.
【００２６】次に、記憶部１１に記憶保持したバッテリ
１の内圧と残容量との相関関係について説明する。Next, the correlation between the internal pressure of the battery 1 stored and stored in the storage unit 11 and the remaining capacity will be described.
【００２７】本発明の発明者等は、前記バッテリ１につ
いて、その満充電状態からバッテリ１の温度等の所定の
条件下で全放電状態まで放電させ、この時、バッテリ１
の種々の残容量において、バッテリ１の内圧の平衡圧を
測定した。尚、内圧の平衡圧を測定したバッテリ１の残
容量は、満充電状態からの放電電流の時間的積算量によ
り把握した。The inventors of the present invention discharge the battery 1 from the fully charged state to the fully discharged state under predetermined conditions such as the temperature of the battery 1, and at this time, the battery 1 is discharged.
The equilibrium pressure of the internal pressure of the battery 1 was measured at various remaining capacities. The remaining capacity of the battery 1 for which the equilibrium pressure of the internal pressure was measured was grasped by the temporal integration amount of the discharge current from the fully charged state.
【００２８】また、本発明の発明者等は、上記のように
放電させたバッテリ１を、その全放電状態から上記と同
一の条件下で満充電状態まで充電し、この時、バッテリ
１の種々の残容量において、バッテリ１の内圧の平衡圧
を測定した。尚、内圧の平衡圧を測定したバッテリ１の
残容量は、全放電状態からの充電電流の時間的積算量に
より把握した。Further, the inventors of the present invention charge the battery 1 discharged as described above from the fully discharged state to the fully charged state under the same conditions as described above. At the remaining capacity of, the equilibrium pressure of the internal pressure of the battery 1 was measured. The remaining capacity of the battery 1 for which the equilibrium pressure of the internal pressure was measured was grasped by the temporal integration amount of the charging current from the fully discharged state.
【００２９】図２はこれらの測定結果を、横軸に残容
量、縦軸に内圧の平衡圧をとって示したものであり、同
図において●で示した点は放電時の測定点、○で示した
点は充電時の測定点である。尚、横軸の残容量は満充電
状態を１００％、全放電状態を０％として百分率により
表した。FIG. 2 shows the results of these measurements, with the horizontal axis representing the remaining capacity and the vertical axis representing the equilibrium pressure of the internal pressure. The points indicated by ● in the figure are the measurement points during discharge, and The points indicated by are the measurement points during charging. In addition, the remaining capacity on the horizontal axis is expressed as a percentage with the fully charged state as 100% and the fully discharged state as 0%.
【００３０】同図を参照して明らかなように、バッテリ
１の内圧の平衡圧は、バッテリ１の残容量に対して顕著
な相関性をもって変化し、放電時には、残容量の減少に
伴って曲線ａで示すような相関性をもって低下し、充電
時には、残容量の増加に伴って曲線ｂで示すような相関
性をもって上昇することが判る。また、放電時と充電時
とでは、各種残容量におけるバッテリ１の内圧の平衡圧
が相違し、充電時の内圧の方が放電時の内圧よりも高く
なる傾向があることが判る。As is apparent from the figure, the equilibrium pressure of the internal pressure of the battery 1 changes with a remarkable correlation with the remaining capacity of the battery 1, and at the time of discharging, it changes with a decrease in the remaining capacity. It can be seen that it decreases with the correlation as shown by a and increases with the correlation as shown by the curve b as the remaining capacity increases during charging. Further, it is understood that the equilibrium pressure of the internal pressure of the battery 1 at various remaining capacities is different between the time of discharging and the time of charging, and the internal pressure during charging tends to be higher than the internal pressure during discharging.
【００３１】そこで、前記残容量推定装置においては、
図２の曲線ａで示すような残容量と内圧との放電時の相
関関係と、曲線ｂで示すような残容量と内圧との充電時
の相関関係とを各別にマップデータやテーブルデータと
して前記記憶部１１に記憶保持した。Therefore, in the remaining capacity estimating device,
The correlation between the remaining capacity and the internal pressure at the time of discharging as shown by the curve a in FIG. 2 and the correlation at the time of charging the remaining capacity and the internal pressure as shown by the curve b are separately described as map data or table data. It was stored and held in the storage unit 11.
【００３２】このような残容量と内圧との相関関係の設
定においては、例えば図２の曲線ａ，ｂを高次式等によ
り近似し、その近似式を記憶部１１に記憶保持させるよ
うにしてもよい。In setting the correlation between the remaining capacity and the internal pressure, for example, the curves a and b in FIG. 2 are approximated by a high-order expression or the like, and the approximate expression is stored in the storage unit 11. Good.
【００３３】尚、上記のようにバッテリ１の残容量と内
圧とが顕著な相関性を有する理由は次のように考えられ
る。すなわち、Ｎｉ−ＭＨバッテリにおいては、その残
容量（放電し得る電気量）は、該バッテリが備える水素
吸蔵合金の水素吸蔵量に依存する。また、詳細は後述す
るが、Ｎｉ−ＭＨバッテリの内部に存在するガスは窒素
ガス、水素ガス及び酸素ガスであり、任意の残容量にお
ける窒素ガス及び酸素ガスの分圧あるいは濃度は、水素
ガスの分圧あるいは濃度に較べてその変化が小さく、従
って、これらのガスによる全体的内圧は、水素ガスの分
圧あるいは濃度に依存する傾向がある。そして、任意の
残容量において、Ｎｉ−ＭＨバッテリの内部に存在する
水素ガスは水素吸蔵合金の水素吸蔵量に対応した平衡圧
あるいはガス濃度となる。このために、Ｎｉ−ＭＨバッ
テリの残容量と内圧との間には、顕著な相関性が現れる
と考えられる。The reason why the remaining capacity of the battery 1 and the internal pressure have a remarkable correlation as described above can be considered as follows. That is, in the Ni-MH battery, the remaining capacity (the amount of electricity that can be discharged) depends on the hydrogen storage amount of the hydrogen storage alloy included in the battery. Further, as will be described later in detail, the gas existing inside the Ni-MH battery is nitrogen gas, hydrogen gas and oxygen gas, and the partial pressure or concentration of nitrogen gas and oxygen gas at any remaining capacity is the same as that of hydrogen gas. The change is small compared to the partial pressure or concentration, so the overall internal pressure due to these gases tends to depend on the partial pressure or concentration of hydrogen gas. Then, at an arbitrary remaining capacity, the hydrogen gas existing inside the Ni-MH battery has an equilibrium pressure or gas concentration corresponding to the hydrogen storage amount of the hydrogen storage alloy. Therefore, it is considered that a significant correlation appears between the remaining capacity of the Ni-MH battery and the internal pressure.
【００３４】次に本実施例の装置の作動を説明する。Next, the operation of the apparatus of this embodiment will be described.
【００３５】例えば、前記スイッチ６を投入してバッテ
リ１の放電を行っている場合において、コントローラ３
の充放電検出部１０は抵抗５に生じる電圧の極性によ
り、放電時であることを認識し、その旨を残容量推定部
１２に出力する。また、圧力センサ２はバッテリ１の内
圧を時々刻々検出し、その検出した内圧を残容量推定部
１２に出力する。この時、残容量推定部１２は、記憶部
１１に放電時と充電時とで各別に記憶された残容量及び
内圧の相関関係のうち、放電時の相関関係に基づいて、
圧力センサ２から得られたバッテリ１の現在の内圧に対
応する残容量を求め、これをバッテリ１の現在の残容量
として推定する。そして、残容量推定部１２は、求めた
残容量を前記表示器４に表示せしめる。For example, when the switch 6 is turned on to discharge the battery 1, the controller 3
The charging / discharging detection unit 10 recognizes that discharging is in progress based on the polarity of the voltage generated in the resistor 5, and outputs a message to that effect to the remaining capacity estimation unit 12. Further, the pressure sensor 2 detects the internal pressure of the battery 1 every moment and outputs the detected internal pressure to the remaining capacity estimation unit 12. At this time, the remaining capacity estimation unit 12 determines, based on the correlation at the time of discharging, of the correlations of the remaining capacity and the internal pressure stored in the storage unit 11 separately for discharging and charging.
The remaining capacity corresponding to the current internal pressure of the battery 1 obtained from the pressure sensor 2 is obtained, and this is estimated as the current remaining capacity of the battery 1. Then, the remaining capacity estimation unit 12 causes the display unit 4 to display the calculated remaining capacity.
【００３６】かかる作動は、前記スイッチ８を投入して
バッテリ１の充電を行っている場合においても同様に行
われる。この場合には、圧力センサ２から得られたバッ
テリ１の現在の内圧から、充電時の相関関係に基づい
て、バッテリ１の現在の残容量が推定される。The above operation is similarly performed when the switch 8 is turned on to charge the battery 1. In this case, the current remaining capacity of the battery 1 is estimated from the current internal pressure of the battery 1 obtained from the pressure sensor 2 based on the correlation at the time of charging.
【００３７】このように、本実施例によれば、バッテリ
１の内圧と残容量との相関関係をあらかじめ設定してお
くことで、バッテリ１の時々刻々の内圧を検出するだけ
でその検出した内圧からバッテリ１の時々刻々の残容量
を推定することができ、極めて簡単な構成でバッテリ１
の残容量を容易に推定することができる。そして、バッ
テリ１の内圧の検出に際しては、バッテリ１の残容量の
推定時点における内圧を検出するだけでよいので、その
検出を行う圧力センサ２はさほど高い検出精度を要求さ
れず、装置構成を安価なものとすることができる。ま
た、バッテリ１の充電時と放電時とで各別に残容量と内
圧との相関関係を設定したので、いずれの場合であって
も的確にバッテリ１の残容量を推定することができる。As described above, according to this embodiment, by setting the correlation between the internal pressure of the battery 1 and the remaining capacity in advance, it is possible to detect only the momentary internal pressure of the battery 1 and detect the detected internal pressure. The remaining capacity of the battery 1 can be estimated from the time, and the battery 1 has an extremely simple configuration.
The remaining capacity of can be easily estimated. When detecting the internal pressure of the battery 1, it is only necessary to detect the internal pressure at the time when the remaining capacity of the battery 1 is estimated. Therefore, the pressure sensor 2 for detecting the internal pressure is not required to have high detection accuracy, and the device configuration is inexpensive. It can be anything. In addition, since the correlation between the remaining capacity and the internal pressure is set separately for charging and discharging the battery 1, the remaining capacity of the battery 1 can be accurately estimated in any case.
【００３８】尚、本実施例においては、バッテリ１の内
圧の測定値のみを用いて残容量を推定するようにした
が、バッテリ１の内圧はバッテリ１の温度によって変化
する場合があるので、このような場合には、バッテリ１
の内圧の測定値から得られる残容量をバッテリ１の温度
によって補正するようにしてもよい。In the present embodiment, the remaining capacity is estimated by using only the measured value of the internal pressure of the battery 1, but the internal pressure of the battery 1 may change depending on the temperature of the battery 1. In such a case, battery 1
The remaining capacity obtained from the measured internal pressure value may be corrected according to the temperature of the battery 1.
【００３９】また、バッテリ１の放電直後や充電直後に
おいては、バッテリ１の内圧は、残容量との間に顕著な
相関関係を有する内圧の平衡圧に落ちつくまでの多少時
間がかかる場合があるので、このような場合には、測定
された内圧から得られる残容量を放電終了時点や充電終
了時点からの経過時間に応じて補正するようにしてもよ
い。Immediately after the battery 1 is discharged or just charged, it may take some time for the internal pressure of the battery 1 to settle to the equilibrium pressure of the internal pressure having a significant correlation with the remaining capacity. In such a case, the remaining capacity obtained from the measured internal pressure may be corrected according to the elapsed time from the discharge end time point or the charge end time point.
【００４０】とろこで、本実施例においては、バッテリ
１の内圧と残容量との相関関係に基づき、内圧の測定値
から残容量を推定するようにしたが、バッテリ１の内部
の水素ガス圧あるいは水素ガス濃度を測定し、その水素
ガス圧あるいは水素ガス濃度と残容量との相関関係に基
づいて該残容量を推定するようにしてもよい。In this embodiment, the residual capacity is estimated from the measured internal pressure based on the correlation between the internal pressure of the battery 1 and the residual capacity. However, the hydrogen gas pressure inside the battery 1 is estimated. Alternatively, the hydrogen gas concentration may be measured, and the remaining capacity may be estimated based on the correlation between the hydrogen gas pressure or the hydrogen gas concentration and the remaining capacity.
【００４１】以下、このことについて図３を参照して説
明する。This will be described below with reference to FIG.
【００４２】本発明の発明者等は、定格容量２５Ａｈの
Ｎｉ−ＭＨバッテリについて、次のような実験を行っ
た。
〔実験１〕上記バッテリについてその全放電状態から温
度等の所定の条件下で所定時間充電を行った後に、所定
時間だけ休止し、次いで該バッテリの放電を所定時間行
った。この時、バッテリの時々刻々の内圧を圧力センサ
を用いて測定した。また、バッテリの充電後の放置時及
び放電時において、該バッテリの内部に存在する窒素ガ
ス、酸素ガス及び水素ガスのガス濃度をガスクロマトグ
ラフィを用いて測定した。
〔実験２〕上記バッテリについて実験１と同様に充電・
休止・放電を行い、バッテリの時々刻々の内圧を圧力セ
ンサを用いて測定した。この時、バッテリの充電時にお
いて、該バッテリの内部に存在する窒素ガス、酸素ガス
及び水素ガスのガス濃度をガスクロマトグラフィを用い
て測定した。The inventors of the present invention conducted the following experiment on a Ni-MH battery having a rated capacity of 25 Ah. [Experiment 1] The battery was charged from the fully discharged state under a predetermined condition such as a temperature for a predetermined time, after which it was paused for a predetermined time, and then the battery was discharged for a predetermined time. At this time, the internal pressure of the battery was measured every moment using a pressure sensor. Further, the gas concentrations of nitrogen gas, oxygen gas and hydrogen gas existing inside the battery were measured by using gas chromatography when the battery was left standing after being charged and when it was discharged. [Experiment 2] Charge the above battery in the same manner as Experiment 1.
After stopping and discharging, the internal pressure of the battery was measured every moment using a pressure sensor. At this time, at the time of charging the battery, the gas concentrations of nitrogen gas, oxygen gas and hydrogen gas existing inside the battery were measured using gas chromatography.
【００４３】これらの実験結果を、横軸に時間、縦軸に
圧力をとって図３に示す。同図において、実線示の曲線
は前記実験１に対応するものであり、破線示の曲線は前
記実験２に対応するものである。また、窒素ガス、酸素
ガス及び水素ガスのガス濃度については、その測定値を
分圧に換算して図３に□、■等で示した。The results of these experiments are shown in FIG. 3 with the horizontal axis representing time and the vertical axis representing pressure. In the figure, the curve indicated by the solid line corresponds to the experiment 1 and the curve indicated by the broken line corresponds to the experiment 2. Regarding the gas concentrations of nitrogen gas, oxygen gas and hydrogen gas, the measured values are converted into partial pressures and shown in □, ■, etc. in FIG.
【００４４】同図を参照して明らかなように、窒素ガス
及び酸素ガスの分圧（ガス濃度）は、バッテリの充放電
にかかわらずほとんど変化せず、水素ガスの分圧（ガス
濃度）は、バッテリの総ガス圧（内圧）とほとんど同様
の傾向でもって変化する。すなわち、水素ガス圧及び総
ガス圧は、バッテリの充電の進行に伴って同様の変化で
もって上昇し、バッテリの放電の進行に伴って同様の変
化でもって低下する。As is apparent from the figure, the partial pressures (gas concentrations) of nitrogen gas and oxygen gas hardly change regardless of the charge and discharge of the battery, and the partial pressures (gas concentrations) of hydrogen gas are , The total gas pressure (internal pressure) of the battery changes with almost the same tendency. That is, the hydrogen gas pressure and the total gas pressure increase with a similar change as the battery charge progresses, and decrease with a similar change as the battery discharge progresses.
【００４５】このことから、バッテリの内圧（総ガス
圧）は、水素ガス圧あるいは水素ガス濃度に比例的に依
存することが判る。そして、前述したように、水素ガス
圧あるいは水素ガス濃度と残容量との間には一定の相関
関係があるので、バッテリの内圧と残容量との間にも一
定の相関関係があることが判る。From this, it is understood that the internal pressure (total gas pressure) of the battery is proportional to the hydrogen gas pressure or the hydrogen gas concentration. As described above, since there is a constant correlation between the hydrogen gas pressure or hydrogen gas concentration and the remaining capacity, it can be seen that there is also a constant correlation between the internal pressure of the battery and the remaining capacity. .
【００４６】従って、水素ガス圧あるいは水素ガス濃度
と残容量との間の相関関係をあらかじめ前述の実施例の
場合と同様に設定しておくと共に、バッテリの残容量の
推定に際して水素ガス圧あるいは水素ガス濃度を測定す
れば、その測定値から上記相関関係に基づいてバッテリ
の時々刻々の残容量を推定することができる。Therefore, the correlation between the hydrogen gas pressure or hydrogen gas concentration and the remaining capacity is set in advance as in the case of the above-mentioned embodiment, and the hydrogen gas pressure or hydrogen is estimated when estimating the remaining capacity of the battery. When the gas concentration is measured, the remaining capacity of the battery can be estimated from the measured value based on the above correlation.
【００４７】この場合、水素ガス圧あるいは水素ガス濃
度は、例えば水素濃度センサ及び圧力センサを用いて検
出することができる。In this case, the hydrogen gas pressure or hydrogen gas concentration can be detected using, for example, a hydrogen concentration sensor and a pressure sensor.
【００４８】[0048]
【発明の効果】上記の説明から明らかなように、本発明
によれば、Ｎｉ−ＭＨバッテリの内圧あるいは水素ガス
圧あるいは水素ガス濃度と残容量との相関関係をあらか
じめ設定しておくと共に、残容量の推定に際して該バッ
テリの内圧あるいは水素ガス圧あるいは水素ガス濃度を
測定し、その測定値と上記相関関係に基づいてバッテリ
の現在の残容量を求めることによって、バッテリの充放
電電流を検出せずとも、容易且つ簡単な構成で残容量を
推定することができる。As is apparent from the above description, according to the present invention, the internal pressure of the Ni-MH battery or the hydrogen gas pressure or the correlation between the hydrogen gas concentration and the remaining capacity is set in advance and the remaining capacity is set. When estimating the capacity, the internal pressure of the battery or the hydrogen gas pressure or the hydrogen gas concentration is measured, and the current remaining capacity of the battery is calculated based on the measured value and the above correlation, so that the charge / discharge current of the battery is not detected. In both cases, the remaining capacity can be estimated with an easy and simple configuration.
【００４９】そして、上記相関関係をＮｉ−ＭＨバッテ
リの充電時と放電時とで各別に設定し、充電時と放電時
とでそれぞれに対応する相関関係を用いてバッテリの残
容量を推定することによって、バッテリの充放電状態に
かかわらず、バッテリの残容量を良好な精度でもって推
定することができる。Then, the above correlation is set separately for charging and discharging of the Ni-MH battery, and the remaining capacity of the battery is estimated by using the correlations corresponding to charging and discharging. Thus, the remaining capacity of the battery can be estimated with good accuracy regardless of the charge / discharge state of the battery.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の一例の残容量推定装置のシステム構成
図。FIG. 1 is a system configuration diagram of a remaining capacity estimation device according to an example of the present invention.
【図２】図１の装置による残容量推定方法を説明するた
めの線図。FIG. 2 is a diagram for explaining a remaining capacity estimation method by the device of FIG.
【図３】Ｎｉ−ＭＨバッテリの充放電時のガス圧の変化
の様子を示す線図。FIG. 3 is a diagram showing how the gas pressure changes when the Ni-MH battery is charged and discharged.
１…Ｎｉ−ＭＨバッテリ、１１…記憶部（記憶手段）、
１２…残容量推定部（残容量推定手段）、１３…充放電
検出手段。1 ... Ni-MH battery, 11 ... Storage unit (storage means),
12 ... Remaining capacity estimating unit (remaining capacity estimating means), 13 ... Charge / discharge detecting means.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 加藤 真志 埼玉県和光市中央１丁目４番１号 株式 会社本田技術研究所内 (56)参考文献 特開 平７−63831（ＪＰ，Ａ) 特開 平５−326027（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 10/42 - 10/48 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Kato 1-4-1, Chuo, Wako-shi, Saitama Inside Honda R & D Co., Ltd. (56) Reference JP-A-7-63831 (JP, A) JP-A 5-326027 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H01M 10/42-10/48
Claims (8)
る工程と、該内圧と前記バッテリの残容量とのあらかじ
め設定された相関関係に基づいて前記測定により得られ
たバッテリの現在の内圧に対応する残容量を求め、その
求めた残容量を前記バッテリの現在の残容量として推定
する工程とから成ることを特徴とするＮｉ−ＭＨバッテ
リの残容量推定方法。1. A step of measuring the current internal pressure of a Ni-MH battery, and a step of measuring the current internal pressure of the battery based on a preset correlation between the internal pressure and the remaining capacity of the battery. A method for estimating the remaining capacity of a Ni-MH battery, the method comprising: determining a corresponding remaining capacity, and estimating the obtained remaining capacity as a current remaining capacity of the battery.
測定する工程と、該水素ガス圧と前記バッテリの残容量
とのあらかじめ設定された相関関係に基づいて前記測定
により得られたバッテリの現在の水素ガス圧に対応する
残容量を求め、その求めた残容量を前記バッテリの現在
の残容量として推定する工程とから成ることを特徴とす
るＮｉ−ＭＨバッテリの残容量推定方法。2. A step of measuring a current hydrogen gas pressure of a Ni-MH battery, and a battery obtained by the measurement based on a preset correlation between the hydrogen gas pressure and the remaining capacity of the battery. A method for estimating the remaining capacity of a Ni-MH battery, the method comprising: determining a remaining capacity corresponding to a current hydrogen gas pressure, and estimating the determined remaining capacity as a current remaining capacity of the battery.
を測定する工程と、該水素ガス濃度と前記バッテリの残
容量とのあらかじめ設定された相関関係に基づいて前記
測定により得られたバッテリの現在の水素ガス濃度に対
応する残容量を求め、その求めた残容量を前記バッテリ
の現在の残容量として推定する工程とから成ることを特
徴とするＮｉ−ＭＨバッテリの残容量推定方法。3. A step of measuring a current hydrogen gas concentration of a Ni-MH battery, and a battery obtained by the measurement based on a preset correlation between the hydrogen gas concentration and the remaining capacity of the battery. A method for estimating the remaining capacity of a Ni-MH battery, comprising the steps of: obtaining a remaining capacity corresponding to the current hydrogen gas concentration, and estimating the obtained remaining capacity as the current remaining capacity of the battery.
放電時とで各別に設定したことを特徴とする請求項１乃
至３のいずれかに記載のＮｉ−ＭＨバッテリの残容量推
定方法。4. The remaining capacity estimation method for a Ni-MH battery according to claim 1, wherein the correlation is set separately when the battery is charged and when the battery is discharged.
る圧力検出手段と、該内圧と前記バッテリの残容量との
あらかじめ設定された相関関係を記憶保持する記憶手段
と、該記憶保持手段に記憶保持された前記相関関係に基
づいて前記測定により得られたバッテリの現在の内圧に
対応する残容量を求め、その求めた残容量を前記バッテ
リの現在の残容量として推定する残容量推定手段とを備
えたことを特徴とするＮｉ−ＭＨバッテリの残容量推定
装置。5. A pressure detecting means for detecting a current internal pressure of a Ni-MH battery, a storing means for storing and holding a preset correlation between the internal pressure and the remaining capacity of the battery, and the storing and holding means. A remaining capacity estimation unit that determines a remaining capacity corresponding to the current internal pressure of the battery obtained by the measurement based on the stored and held correlation, and estimates the remaining capacity that is obtained as the current remaining capacity of the battery. A remaining capacity estimation device for a Ni-MH battery, comprising:
検出する圧力検出手段と、該水素ガス圧と前記バッテリ
の残容量とのあらかじめ設定された相関関係を記憶保持
する記憶手段と、該記憶保持手段に記憶保持された前記
相関関係に基づいて前記測定により得られたバッテリの
現在の水素ガス圧に対応する残容量を求め、その求めた
残容量を前記バッテリの現在の残容量として推定する残
容量推定手段とを備えたことを特徴とするＮｉ−ＭＨバ
ッテリの残容量推定装置。6. A pressure detection means for detecting the current hydrogen gas pressure of a Ni-MH battery, a storage means for storing and holding a preset correlation between the hydrogen gas pressure and the remaining capacity of the battery, and The remaining capacity corresponding to the current hydrogen gas pressure of the battery obtained by the measurement is obtained based on the correlation stored and stored in the storage unit, and the obtained remaining capacity is estimated as the current remaining capacity of the battery. The remaining capacity estimating device for a Ni-MH battery, comprising:
を検出する濃度検出手段と、該水素ガス濃度と前記バッ
テリの残容量とのあらかじめ設定された相関関係を記憶
保持する記憶手段と、該記憶保持手段に記憶保持された
前記相関関係に基づいて前記測定により得られたバッテ
リの現在の水素ガス濃度に対応する残容量を求め、その
求めた残容量を前記バッテリの現在の残容量として推定
する残容量推定手段とを備えたことを特徴とするＮｉ−
ＭＨバッテリの残容量推定装置。7. A concentration detecting means for detecting a current hydrogen gas concentration of a Ni-MH battery; a storage means for storing and retaining a preset correlation between the hydrogen gas concentration and the remaining capacity of the battery; A remaining capacity corresponding to the current hydrogen gas concentration of the battery obtained by the measurement is obtained based on the correlation stored and held in the storage means, and the obtained remaining capacity is estimated as the current remaining capacity of the battery. And a remaining capacity estimating means for
MH battery remaining capacity estimation device.
るかを検出する充放電検出手段を備え、前記記憶手段に
記憶保持された前記相関関係は前記バッテリの充電時と
放電時とで各別に設定され、前記残容量推定手段は、前
記充放電検出手段により検出された充放電に対応する相
関関係に基づいて前記バッテリの現在の残容量を推定す
ることを特徴とする請求項５乃至７のいずれかに記載の
Ｎｉ−ＭＨバッテリの残容量推定装置。8. A charging / discharging detection means for detecting whether the battery is charging or discharging, and the correlation stored in the storage means is stored between the charging and discharging of the battery. 6. The remaining capacity estimation unit, which is set separately, estimates the current remaining capacity of the battery based on the correlation corresponding to the charge / discharge detected by the charge / discharge detection unit. 7. The Ni-MH battery remaining capacity estimation device according to any one of 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04819994A JP3426019B2 (en) | 1994-03-18 | 1994-03-18 | Method and apparatus for estimating remaining capacity of Ni-MH battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04819994A JP3426019B2 (en) | 1994-03-18 | 1994-03-18 | Method and apparatus for estimating remaining capacity of Ni-MH battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07263033A JPH07263033A (en) | 1995-10-13 |
| JP3426019B2 true JP3426019B2 (en) | 2003-07-14 |
Family
ID=12796720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04819994A Expired - Lifetime JP3426019B2 (en) | 1994-03-18 | 1994-03-18 | Method and apparatus for estimating remaining capacity of Ni-MH battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3426019B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9397370B2 (en) | 1999-06-25 | 2016-07-19 | The Board Of Trustees Of The University Of Illinois | Single and multiple cell battery with built-in controller |
| CN103344920B (en) * | 2013-07-01 | 2016-05-25 | 华为技术有限公司 | A kind of method and apparatus that detects cell health state |
| JP6951041B2 (en) * | 2017-07-12 | 2021-10-20 | 株式会社Ｓｏｋｅｎ | Rechargeable battery system |
| JP7152903B2 (en) * | 2018-08-21 | 2022-10-13 | Fdk株式会社 | Charging control method and charging control system for secondary battery |
| CN109975715B (en) * | 2019-03-08 | 2021-05-14 | 天津力神电池股份有限公司 | Method for obtaining residual electric quantity of lithium ion battery module of electric vehicle |
-
1994
- 1994-03-18 JP JP04819994A patent/JP3426019B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07263033A (en) | 1995-10-13 |
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