JP2000323182A - Battery pack power source device - Google Patents
Battery pack power source deviceInfo
- Publication number
- JP2000323182A JP2000323182A JP11126847A JP12684799A JP2000323182A JP 2000323182 A JP2000323182 A JP 2000323182A JP 11126847 A JP11126847 A JP 11126847A JP 12684799 A JP12684799 A JP 12684799A JP 2000323182 A JP2000323182 A JP 2000323182A
- Authority
- JP
- Japan
- Prior art keywords
- time
- charge
- current
- discharge
- current value
- 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.)
- Granted
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、充電式の複数のセ
ルを内蔵した電池パックの充放電完了時間の算出機能を
備えた電池パック電源装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack power supply device having a function of calculating a charge / discharge completion time of a battery pack containing a plurality of rechargeable cells.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】一般に
携帯電話やノートパソコン、プレーヤー、デジタルカメ
ラなどの携帯型電子機器には、電源として充電式の複数
のセルを内蔵した電池パックが用いられている。特に携
帯型電子機器においては、通常の商用電源を使用する機
器とは異なり、確実な動作を保証するためには十分な容
量の電池電源が必要である。そのため、残容量を把握し
て正確な放電時間を求めることが要求される。2. Description of the Related Art In general, portable electronic devices such as mobile phones, notebook computers, players, digital cameras and the like use a battery pack containing a plurality of rechargeable cells as a power source. I have. In particular, in portable electronic devices, unlike devices that use a normal commercial power supply, a battery power source having a sufficient capacity is required to guarantee reliable operation. Therefore, it is required that the remaining capacity is grasped to determine an accurate discharge time.
【０００３】通常電池パックの放電時間は、現在の電流
値または平均電流値で残容量を割って算出している。ま
た、充電時間は、満充電容量から残容量を引いた値を現
在の電流値、又は平均電流値で割って算出している。し
かし、このような方法では、電流値が変化している場合
に充放電完了時間の正確な算出ができないという問題が
生じる。Normally, the discharge time of a battery pack is calculated by dividing the remaining capacity by the current value or the average current value. The charge time is calculated by dividing a value obtained by subtracting the remaining capacity from the full charge capacity by the current value or the average current value. However, such a method has a problem that it is not possible to accurately calculate the charge / discharge completion time when the current value changes.
【０００４】[0004]
【課題を解決するための手段】本発明は、上記課題を解
決するものであって、電流値の変化に影響されることな
く充放電完了時間を正確に算出できるようにするもので
ある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to accurately calculate a charge / discharge completion time without being affected by a change in a current value.
【０００５】そのために本発明は、充電式の複数のセル
を内蔵した電池パックの充放電完了時間の算出機能を備
えた電池パック電源装置であって、充電又は放電時の電
流を検出する電流検出手段と、充電又は放電時の相対時
間と電流値を記憶する記憶手段と、前記相対時間と電流
値の関数を近似する近似手段と、前記近似した関数と現
在の残容量に基づき充放電完了時間を求める演算手段と
を備え、前記相対時間と電流値に基づき前記関数を近似
し電池パックの充放電完了時間を求めることを特徴とす
るものである。[0005] Therefore, the present invention provides a battery pack power supply device having a function of calculating the charge / discharge completion time of a battery pack containing a plurality of rechargeable cells, wherein the current detection device detects a current during charging or discharging. Means, storage means for storing the relative time and current value at the time of charge or discharge, approximation means for approximating the function of the relative time and current value, charge and discharge completion time based on the approximated function and the current remaining capacity And calculating the battery pack charge / discharge completion time by approximating the function based on the relative time and the current value.
【０００６】また、前記近似手段は、前記関数を充放電
電流値又は平均充放電電流値から直線、曲線又は複数の
直線で、最小二乗法により近似し、前記演算手段は、放
電完了時間の算出において、現在の残容量に現在からの
放電電流の積分値が等しくなる時点を求め、充電完了時
間の算出において、満充電容量と現在の残容量との差に
現在からの充電電流の積分値が等しくなる時点を求め、
充電完了時間の算出において、所定の充電率に達するま
では定電流充電と仮定し、前記所定の充電率以上は、充
電電流と時間の関数を指数曲線にて近似し、所定の充電
電流値以下になった時点を求めることを特徴とするもの
である。The approximation means approximates the function by a least square method from a charge / discharge current value or an average charge / discharge current value using a straight line, a curve or a plurality of straight lines, and the calculation means calculates a discharge completion time. In, the time when the integrated value of the discharge current from the present is equal to the current remaining capacity is obtained, and in the calculation of the charging completion time, the integrated value of the charging current from the present is calculated by the difference between the full charged capacity and the current remaining capacity. Find the time when they are equal,
In the calculation of the charging completion time, it is assumed that constant current charging is performed until a predetermined charging rate is reached. Above the predetermined charging rate, the function of charging current and time is approximated by an exponential curve, and a predetermined charging current value or less is used. It is characterized in that a point in time when the condition is reached is obtained.
【０００７】さらに、充電式の複数のセルを内蔵した電
池パックの充放電完了時間の算出機能を備えた電池パッ
ク電源装置であって、充電又は放電時の電流を検出する
電流検出手段と、充電又は放電時のセル温度を検出する
温度検出手段と、充電又は放電時の相対時刻と平均電流
値及びセル温度を記憶する記憶手段と、前記相対時刻と
平均電流値及びセル温度を過去のデータと比較して充放
電完了時間を求める演算手段とを備えたことを特徴と
し、前記記憶手段は、前記相対時刻と平均電流値及びセ
ル温度を直線、曲線又は複数の直線で近似して記憶し、
前記演算手段は、所定の充電率における過去の充放電電
流値と現在の充放電電流値との差及び過去のセル温度と
現在のセル温度との差が所定値以内である場合に、過去
の充放電電流値と相対時間とのデータから充放電完了時
間を求めることを特徴とするものである。A battery pack power supply device having a function of calculating a charge / discharge completion time of a battery pack containing a plurality of rechargeable cells, wherein current detection means for detecting a current during charging or discharging; Or temperature detection means for detecting the cell temperature at the time of discharge, storage means for storing the relative time and the average current value and the cell temperature at the time of charge or discharge, and the relative time and the average current value and the cell temperature with past data Calculating means for comparing and calculating a charge / discharge completion time, wherein the storage means stores the relative time, the average current value and the cell temperature by approximating the straight line, a curve or a plurality of straight lines,
The calculating means, when the difference between the past charge and discharge current value and the current charge and discharge current value at a predetermined charging rate and the difference between the past cell temperature and the current cell temperature are within a predetermined value, It is characterized in that a charge / discharge completion time is obtained from data of a charge / discharge current value and a relative time.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照しつつ説明する。図１は本発明に係る電池パック
電源装置の実施の形態を示す図であり、１はセル、２は
充電制御回路、３は出力制御回路、４は電流検出回路、
５はセル温度検出回路、６はサンプリング回路、７は記
憶回路、８は時計、９は近似回路、１０は充放電時間演
算回路、１１は制御装置を示す。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a battery pack power supply device according to the present invention, wherein 1 is a cell, 2 is a charge control circuit, 3 is an output control circuit, 4 is a current detection circuit,
Reference numeral 5 denotes a cell temperature detection circuit, 6 denotes a sampling circuit, 7 denotes a storage circuit, 8 denotes a clock, 9 denotes an approximation circuit, 10 denotes a charge / discharge time calculation circuit, and 11 denotes a control device.
【０００９】図１において、セル１は、直列接続されて
電池パックを構成する充電式の複数の電池であり、充電
制御回路２を介して充電電源に接続されて充電（蓄電）
し、出力制御回路３を介して携帯型電子機器などの負荷
に接続されて放電（給電）するものである。電流検出回
路４は、セル１に直列に挿入接続された電流検出用抵抗
Ｒｉにより充電電流や放電電流を検出し、セル温度検出
回路５は、セル１の温度を検出するものであり、サンプ
リング回路６は、設定された所定のサンプリング周期に
したがって電流検出回路４で検出する充電電流や放電電
流、セル温度検出回路５で検出するセル温度をサンプリ
ングし、そのデータを充電／放電、時刻と共に記憶回路
７に記憶するものである。時計８は、サンプリング回路
６にサンプリングの時刻情報を与えるものである。In FIG. 1, a cell 1 is a plurality of rechargeable batteries connected in series to form a battery pack, and connected to a charging power supply via a charging control circuit 2 for charging (storage).
Then, it is connected to a load such as a portable electronic device via the output control circuit 3 and discharges (feeds). The current detecting circuit 4 detects a charging current or a discharging current by a current detecting resistor Ri inserted and connected in series with the cell 1, and the cell temperature detecting circuit 5 detects a temperature of the cell 1; A sampling circuit 6 samples a charging current and a discharging current detected by the current detecting circuit 4 and a cell temperature detected by the cell temperature detecting circuit 5 in accordance with a set predetermined sampling cycle, and stores the data together with the charging / discharging and the time along with the storage circuit. 7 is stored. The clock 8 gives sampling time information to the sampling circuit 6.
【００１０】近似回路９は、充電又は放電時の相対時間
と電流値の関数を近似するものであり、例えば最小二乗
法により、少なくとも３点以上の充放電電流値又は平均
充放電電流値から充放電電流値と相対時間の関数を直
線、曲線又は複数の直線（折れ線）で近似するものであ
る。充放電時間演算回路１０は、近似回路９で近似した
関数、過去のデータ、充電率などに基づき、現時点から
の充放電完了時間を求めるものである。例えば放電完了
時間の算出においては、現在の残容量に現在からの放電
電流の積分値が等しくなる時点を求め、また、充電完了
時間においては、満充電容量と現在の残容量との差に現
在からの充電電流の積分値が等しくなる時点を求める。
制御装置１１は、全体の制御を行うものである。The approximation circuit 9 approximates the function of the relative time and the current value at the time of charge or discharge. For example, the charge / discharge current value of at least three points or the average charge / discharge current value is calculated by the least square method. The function of the discharge current value and the relative time is approximated by a straight line, a curve, or a plurality of straight lines (polylines). The charge / discharge time calculation circuit 10 calculates a charge / discharge completion time from the present time based on a function approximated by the approximation circuit 9, past data, charging rate, and the like. For example, in the calculation of the discharge completion time, a point in time at which the integrated value of the discharge current from the present time becomes equal to the current remaining capacity is obtained, and in the charge completion time, the difference between the full charge capacity and the current remaining capacity is calculated. The point in time at which the integral values of the charging currents from are equal.
The control device 11 performs overall control.
【００１１】次に、充電又は放電時の相対時間と検出し
た電流値から近似回路９により近似を行う関数の例を説
明する。図２は放電時の相対時間と電流との関数を直線
で近似し放電完了時間を予測する例を説明するための図
である。図２に示すＸ、Ｙ、Ｚの３点は、それぞれ電流
が２．５Ａ、２．０Ａ、２．１Ａ、相対時間が０．５０
Ｈ、０．７５Ｈ、１．００Ｈ、つまり０．２５Ｈのイン
ターバルで検出された場合の例である。これら電流値と
相対時間から最小二乗法により直線近似した関数ｉ＝ａ
・ｔ＋ｂのａ、ｂを求めると、以下のようになる。Next, an example of a function for approximating by the approximation circuit 9 from the relative time at the time of charging or discharging and the detected current value will be described. FIG. 2 is a diagram for explaining an example in which the function of the relative time and the current at the time of discharging is approximated by a straight line and the discharge completion time is predicted. The three points X, Y, and Z shown in FIG. 2 indicate that the current is 2.5 A, 2.0 A, 2.1 A, and the relative time is 0.50, respectively.
H, 0.75H, 1.00H, that is, an example in the case of detection at intervals of 0.25H. A function i = a linearly approximated by the least squares method from the current value and the relative time
When a and b of t + b are obtained, the following is obtained.
【００１２】[0012]
【数１】 (Equation 1)
【００１３】したがって、近似直線は、ｉ＝−０．８・
ｔ＋２．８となる。そこで、現在の残量を１．６Ａｈと
し現在の相対時刻を１Ｈとすると、Therefore, the approximate straight line is i = −0.8 ·
t + 2.8. Therefore, assuming that the current remaining amount is 1.6 Ah and the current relative time is 1 H,
【００１４】[0014]
【数２】 (Equation 2)
【００１５】となり、この２次方程式を解くと、ｔ1 ＝
２．５となるが、小さい方のｔ1 ＝２がこの場合の解と
なる。よって、現在の相対時刻が１Ｈであるので、現在
から１時間後が放電完了時間の予測値となる。## EQU1 ## When this quadratic equation is solved, t 1 =
2.5, but the smaller t 1 = 2 is the solution in this case. Therefore, since the current relative time is 1H, one hour after the present time is the predicted value of the discharge completion time.
【００１６】なお、本発明は、上記実施の形態に限定さ
れるものではなく、種々の変形が可能である。例えば上
記実施の形態では、充電又は放電時の相対時間と電流値
の関数を直線近似する場合に、最小二乗法により近似し
たが、曲線近似する場合にも、同様に最小二乗法により
近似することができる。また、充電完了時間の算出にお
いて、所定の充電率に達するまでは定電流充電と仮定
し、その所定の充電率以上になると、充電電流と時間の
関数を指数曲線（ｉ＝ｂ・ａt ）にて近似し、所定の充
電電流値、例えば１００ｍＡ以下になった時点を充電完
了時間として求めてもよい。It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, when the function of the relative time and the current value at the time of charging or discharging is approximated by a straight line, the approximation is performed by the least squares method. Can be. Further, in the calculation of the charge completion time, until it reaches a predetermined charging rate assuming constant current charging, it becomes above its predetermined charging rate, an exponential curve function of the charging current and time (i = b · a t) And a point in time when the charge current value becomes equal to or less than a predetermined charge current value, for example, 100 mA, may be obtained as the charge completion time.
【００１７】放電又は充電時の相対時刻と平均電流値及
びセル温度を所定の充電率毎に記憶し、又はこれらのデ
ータから直線、曲線又は複数の直線で近似し記憶してお
き、これらの記憶された過去のデータから充放電完了時
間を求めるようにしてもよい。例えば放電完了時間の算
出においては、過去に記憶された所定の充電率における
放電電流値と現在の放電電流値との差が所定の電流値以
内である場合で、且つ過去に記憶された所定の充電率に
おけるセル温度と現在のセル温度との差が所定の温度以
内である場合に、過去の放電電流値と相対時間とのデー
タから放電完了時間を求めてもよい。充電完了時間の算
出においても、同様に過去に記憶された所定の充電率に
おける充電電流値と現在の充電電流値との差が所定の電
流値以内である場合で、且つ過去に記憶された所定の充
電率におけるセル温度と現在のセル温度との差が所定の
温度以内である場合に、過去の充電電流値と相対時間と
のデータから充電完了時間を求めてもよい。The relative time, average current value and cell temperature at the time of discharging or charging are stored for each predetermined charging rate, or these data are approximated and stored as a straight line, a curve or a plurality of straight lines, and stored. The charge / discharge completion time may be obtained from the past data obtained. For example, in the calculation of the discharge completion time, when the difference between the discharge current value at the predetermined charge rate stored in the past and the current discharge current value is within the predetermined current value, and the predetermined stored value in the past is used. When the difference between the cell temperature at the state of charge and the current cell temperature is within a predetermined temperature, the discharge completion time may be obtained from the data of the past discharge current value and the relative time. Similarly, in the calculation of the charging completion time, the difference between the charging current value at the predetermined charging rate stored in the past and the current charging current value is within the predetermined current value, and the previously stored predetermined When the difference between the cell temperature and the current cell temperature at the charging rate is within a predetermined temperature, the charging completion time may be obtained from the data of the past charging current value and the relative time.
【００１８】図３は周期的に変動する負荷の平均電流値
を用いる例を説明するための図、図４は定電流充電から
定電圧充電に切り替わる様子と電流及び電圧の変化の様
子を示す図、図５は電池の内部インピーダンスを説明す
るための図である。FIG. 3 is a diagram for explaining an example using an average current value of a load that fluctuates periodically. FIG. 4 is a diagram showing a state of switching from constant current charging to constant voltage charging and a state of changes in current and voltage. FIG. 5 is a diagram for explaining the internal impedance of the battery.
【００１９】通常外部負荷は、定電力負荷、定抵抗負
荷、さらに周期的に変動する負荷等様々であり、定電流
負荷はほとんどない。これらのうち、定電力負荷の場合
には、電池電圧が低下すると逆に電流値は増加するのに
対し、定抵抗負荷の場合には、電池電圧が低下すると電
流値も低下する。周期的に変動する負荷の場合には、例
えば周期的にモータが起動する場合であり、図３に示す
ようにその周期毎、又は周期の倍数の電流平均値をと
り、その平均値がどのような時間の関数になるか近似す
ることによって、放電時間を算出する。Usually, there are various types of external loads, such as a constant power load, a constant resistance load, and a load that fluctuates periodically, and there is almost no constant current load. Among them, in the case of the constant power load, the current value increases when the battery voltage decreases, whereas in the case of the constant resistance load, the current value decreases when the battery voltage decreases. In the case of a load that fluctuates periodically, for example, a case where the motor is started periodically, the current average value is taken for each cycle or a multiple of the cycle as shown in FIG. The discharge time is calculated by approximating or approximating the discharge time.
【００２０】充電において、定電流充電から定電圧充電
に切り替わる充電率は、内部インピーダンスと電流に依
存し、充電電圧＝ＯＣＶ＋Ｒ×ｉとなったとき定電流充
電から定電圧充電に切り替わる。ここで、ＯＣＶは電池
パックの開路電圧（基準開路電圧）、Ｒは電池の内部イ
ンピーダンス＋回路部のインピーダンス、ｉは充電電流
であり、これらの変化を示したのが図４である。電池の
内部インピーダンスは、図５に示すように温度に依存
し、温度が低いほど充電率が低くても定電圧充電とな
り、充電時間が長くなる。予め基準開路電圧波形と電池
の内部インピーダンスと回路部のインピーダンスを決め
手おけば、定電流充電から定電圧充電に切り替わる時点
が算出できる。In charging, the charging rate at which switching from constant-current charging to constant-voltage charging depends on the internal impedance and current, and switches from constant-current charging to constant-voltage charging when charging voltage = OCV + R × i. Here, OCV is the open circuit voltage (reference open circuit voltage) of the battery pack, R is the internal impedance of the battery + the impedance of the circuit section, and i is the charging current. FIG. 4 shows these changes. As shown in FIG. 5, the internal impedance of the battery depends on the temperature. The lower the temperature, the lower the temperature, the lower the charging rate. If the reference open-circuit voltage waveform, the internal impedance of the battery, and the impedance of the circuit unit are determined in advance, the point in time at which switching from constant current charging to constant voltage charging can be calculated.
【００２１】[0021]
【発明の効果】以上の説明から明らかなように、本発明
によれば、充電式の複数のセルを内蔵した電池パックの
充放電完了時間の算出機能を備えた電池パック電源装置
であって、充電又は放電時の電流を検出する電流検出手
段と、充電又は放電時の相対時間と電流値を記憶する記
憶手段と、相対時間と電流値の関数を近似する近似手段
と、近似した関数と現在の残容量に基づき充放電完了時
間を求める演算手段とを備え、記憶手段に記憶した相対
時間と電流値に基づき関数を近似し電池パックの充放電
完了時間を求めるので、電流値が変化している場合で
も、その変化に応じた充放電時間の算出が可能となる。As is apparent from the above description, according to the present invention, there is provided a battery pack power supply device having a function of calculating a charge / discharge completion time of a battery pack containing a plurality of rechargeable cells, Current detection means for detecting current during charging or discharging; storage means for storing relative time and current value during charging or discharging; approximation means for approximating a function of relative time and current value; Calculating means for calculating the charge / discharge completion time based on the remaining capacity of the battery pack, and calculating the charge / discharge completion time of the battery pack by approximating a function based on the relative time and the current value stored in the storage means, so that the current value changes. Even if the change is made, it is possible to calculate the charge / discharge time according to the change.
【００２２】しかも、近似手段は、関数を充放電電流値
又は平均充放電電流値から直線、曲線又は複数の直線
で、最小二乗法により近似し、演算手段は、放電完了時
間の算出において、現在の残容量に現在からの放電電流
の積分値が等しくなる時点を求め、充電完了時間の算出
において、満充電容量と現在の残容量との差に現在から
の充電電流の積分値が等しくなる時点を求め、充電完了
時間の算出において、所定の充電率に達するまでは定電
流充電と仮定し、所定の充電率以上は、充電電流と時間
の関数を指数曲線にて近似し、所定の充電電流値以下に
なった時点を求めるので、少ない情報により充放電時間
の正確な算出が可能となる。Further, the approximating means approximates the function from the charging / discharging current value or the average charging / discharging current value with a straight line, a curve or a plurality of straight lines by the least squares method. The time at which the integrated value of the discharge current from the present time is equal to the remaining capacity of the battery is calculated, and the time at which the integrated value of the current charge current becomes equal to the difference between the full charge capacity and the current remaining capacity in calculating the charge completion time In the calculation of the charging completion time, constant current charging is assumed until a predetermined charging rate is reached, and a function of charging current and time is approximated by an exponential curve for a predetermined charging rate or more, and a predetermined charging current is calculated. Since the time point when the value becomes equal to or less than the value is obtained, accurate calculation of the charge / discharge time can be performed with a small amount of information.
【００２３】また、充電又は放電時のセル温度を検出す
る温度検出手段と、充電又は放電時の相対時刻と平均電
流値及びセル温度を記憶する記憶手段と、記憶手段に記
憶した相対時刻と平均電流値及びセル温度を過去のデー
タと比較して充放電完了時間を求める演算手段とを備
え、相対時刻と平均電流値及びセル温度を直線、曲線又
は複数の直線で近似して記憶し、所定の充電率における
過去の充放電電流値と現在の充放電電流値との差及び過
去のセル温度と現在のセル温度との差が所定値以内であ
る場合に、過去の充放電電流値と相対時間とのデータか
ら充放電完了時間を求めるので、過去の実績に基づいた
充放電時間の正確な算出が可能となる。A temperature detecting means for detecting a cell temperature at the time of charging or discharging; a storing means for storing a relative time and an average current value and a cell temperature at the time of charging or discharging; Calculating means for comparing the current value and the cell temperature with the past data to determine the charging / discharging completion time; storing the relative time, the average current value and the cell temperature by approximating them with a straight line, a curve or a plurality of straight lines, When the difference between the past charge / discharge current value and the current charge / discharge current value and the difference between the past cell temperature and the current cell temperature at the charge rate are within a predetermined value, the relative value of the past charge / discharge current value Since the charge / discharge completion time is obtained from the time data, it is possible to accurately calculate the charge / discharge time based on past results.
【図１】 本発明に係る電池パック電源装置の実施の形
態を示す図である。FIG. 1 is a diagram showing an embodiment of a battery pack power supply device according to the present invention.
【図２】 放電時の相対時間と電流との関数を直線で近
似し放電完了時間を予測する例を説明するための図であ
る。FIG. 2 is a diagram for explaining an example of predicting a discharge completion time by approximating a function of a relative time and a current at the time of discharge with a straight line.
【図３】 周期的に変動する負荷の平均電流値を用いる
例を説明するための図である。FIG. 3 is a diagram illustrating an example in which an average current value of a load that fluctuates periodically is used.
【図４】 定電流充電から定電圧充電に切り替わる様子
と電流及び電圧の変化の様子を示す図である。FIG. 4 is a diagram illustrating a state of switching from constant current charging to constant voltage charging and a state of changes in current and voltage.
【図５】 電池の内部インピーダンスを説明するための
図である。FIG. 5 is a diagram for explaining the internal impedance of a battery.
【符号の説明】 １…セル、２…充電制御回路、３…出力制御回路、４…
電流検出回路、５…セル温度検出回路、６…サンプリン
グ回路、７…記憶回路、８…時計、９…近似回路、１０
…充放電時間演算回路、１１…制御装置[Description of Signs] 1 ... cell, 2 ... charge control circuit, 3 ... output control circuit, 4 ...
Current detection circuit, 5: cell temperature detection circuit, 6: sampling circuit, 7: storage circuit, 8: clock, 9: approximation circuit, 10
... Charge / discharge time calculation circuit, 11 ... Control device
Claims (8)
クの充放電完了時間の算出機能を備えた電池パック電源
装置であって、充電又は放電時の電流を検出する電流検
出手段と、充電又は放電時の相対時間と電流値を記憶す
る記憶手段と、前記相対時間と電流値の関数を近似する
近似手段と、前記近似した関数と現在の残容量に基づき
充放電完了時間を求める演算手段とを備え、相対時間と
電流値に基づき前記関数を近似し電池パックの充放電完
了時間を求めることを特徴とする電池パック電源装置。1. A battery pack power supply device having a function of calculating a charge / discharge completion time of a battery pack including a plurality of rechargeable cells, wherein current detection means for detecting a current at the time of charging or discharging; Or storage means for storing a relative time and a current value at the time of discharge, approximation means for approximating a function of the relative time and the current value, and calculation means for calculating a charge / discharge completion time based on the approximated function and the current remaining capacity. And a battery pack power supply device that approximates the function based on a relative time and a current value to obtain a charge / discharge completion time of the battery pack.
値又は平均充放電電流値から直線、曲線又は複数の直線
で近似することを特徴とする請求項１記載の電池パック
電源装置。2. The battery pack power supply device according to claim 1, wherein the approximating unit approximates the function from a charge / discharge current value or an average charge / discharge current value with a straight line, a curve, or a plurality of straight lines.
により近似することを特徴とする請求項１記載の電池パ
ック電源装置。3. The battery pack power supply device according to claim 1, wherein said approximating means approximates said function by a least square method.
おいて、現在の残容量に現在からの放電電流の積分値が
等しくなる時点を求め、充電完了時間の算出において、
満充電容量と現在の残容量との差に現在からの充電電流
の積分値が等しくなる時点を求めることを特徴とする請
求項１記載の電池パック電源装置。4. The calculation means calculates a time when the integrated value of the current discharge current becomes equal to the current remaining capacity in the calculation of the discharge completion time.
2. The battery pack power supply device according to claim 1, wherein a time point at which the integrated value of the charging current from the present time becomes equal to the difference between the full charge capacity and the current remaining capacity is obtained.
おいて、所定の充電率に達するまでは定電流充電と仮定
し、前記所定の充電率以上は、充電電流と時間の関数を
指数曲線にて近似し、所定の充電電流値以下になった時
点を求めることを特徴とする請求項１記載の電池パック
電源装置。5. The calculation means, in calculating a charging completion time, assumes constant-current charging until a predetermined charging rate is reached, and calculates a function of charging current and time into an exponential curve when the charging rate is equal to or higher than the predetermined charging rate. 2. The battery pack power supply device according to claim 1, wherein a time point when the charge current value becomes equal to or less than a predetermined value is obtained.
クの充放電完了時間の算出機能を備えた電池パック電源
装置であって、充電又は放電時の電流を検出する電流検
出手段と、充電又は放電時のセル温度を検出する温度検
出手段と、充電又は放電時の相対時刻と平均電流値及び
セル温度を記憶する記憶手段と、前記相対時刻と平均電
流値及びセル温度を過去のデータと比較して充放電完了
時間を求める演算手段とを備えたことを特徴とする電池
パック電源装置。6. A battery pack power supply device having a function of calculating a charge / discharge completion time of a battery pack containing a plurality of rechargeable cells, wherein current detection means for detecting a current during charging or discharging; Or temperature detection means for detecting the cell temperature at the time of discharge, storage means for storing the relative time and the average current value and the cell temperature at the time of charge or discharge, and the relative time and the average current value and the cell temperature with past data A battery pack power supply device comprising: a calculating means for comparing and calculating a charge / discharge completion time.
流値及びセル温度を直線、曲線又は複数の直線で近似し
て記憶することを特徴とする請求項６記載の電池パック
電源装置。7. The battery pack power supply device according to claim 6, wherein the storage unit stores the relative time, the average current value, and the cell temperature by approximating the relative time with a straight line, a curve, or a plurality of straight lines.
過去の充放電電流値と現在の充放電電流値との差及び過
去のセル温度と現在のセル温度との差が所定値以内であ
る場合に、過去の充放電電流値と相対時間とのデータか
ら充放電完了時間を求めることを特徴とする請求項６記
載の電池パック電源装置。8. The computing means according to claim 1, wherein a difference between a past charge / discharge current value and a current charge / discharge current value at a predetermined charge rate and a difference between a past cell temperature and a current cell temperature are within a predetermined value. 7. The battery pack power supply device according to claim 6, wherein the charging / discharging completion time is obtained from the data of the past charging / discharging current value and the relative time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12684799A JP3249788B2 (en) | 1999-05-07 | 1999-05-07 | Battery pack power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12684799A JP3249788B2 (en) | 1999-05-07 | 1999-05-07 | Battery pack power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000323182A true JP2000323182A (en) | 2000-11-24 |
| JP3249788B2 JP3249788B2 (en) | 2002-01-21 |
Family
ID=14945345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12684799A Expired - Lifetime JP3249788B2 (en) | 1999-05-07 | 1999-05-07 | Battery pack power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3249788B2 (en) |
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