JPH118940A - Battery voltage measuring instrument and charging amount measuring instrument using it - Google Patents

Battery voltage measuring instrument and charging amount measuring instrument using it

Info

Publication number
JPH118940A
JPH118940A JP9158769A JP15876997A JPH118940A JP H118940 A JPH118940 A JP H118940A JP 9158769 A JP9158769 A JP 9158769A JP 15876997 A JP15876997 A JP 15876997A JP H118940 A JPH118940 A JP H118940A
Authority
JP
Japan
Prior art keywords
battery
voltage
secondary battery
current
battery voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9158769A
Other languages
Japanese (ja)
Inventor
Toru Yoshida
徹 吉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FDK Twicell Co Ltd
Original Assignee
Toshiba Battery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Battery Co Ltd filed Critical Toshiba Battery Co Ltd
Priority to JP9158769A priority Critical patent/JPH118940A/en
Publication of JPH118940A publication Critical patent/JPH118940A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Landscapes

  • Secondary Cells (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a battery voltage measuring instrument, which can appropriately control the voltage of a secondary battery without being affected by the presence/absence of charging/discharging, magnitude of the charging/ discharging currents, internal impedance, etc., of the battery and can stop the charging/discharging of the battery. SOLUTION: A battery voltage measuring instrument is provided with a switch 2 connected in series with the charging/discharging path of a secondary battery 1, a current-measuring section 13 which measures the charging current or discharging current of the battery 1 via a resistor 3 for detecting current connected in series with the charging/discharging path, a voltage-measuring section 14 which measures the voltage of the battery 1, and an arithmetic section 15 which calculates the internal impedance of the battery 1 from the measured results of the measuring sections 13 and 14 and corrects the voltage of the battery measured by means of the measuring section 14, based on the internal impedance.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、二次電池の電池電
圧測定装置およびこれを用いた充電量測定装置に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery voltage measuring device for a secondary battery and a charge amount measuring device using the same.

【0002】[0002]

【従来の技術】一般に、二次電池を用いた電池パックに
おいては、電池電圧が所定値(放電終止電圧)以下とな
るような過放電を行うと電池の特性を劣化させるため、
放電時には、電池電圧が放電終止電圧に相当する閾値ま
で低下する放電を停止させる方法がとられる。
2. Description of the Related Art Generally, in a battery pack using a secondary battery, if overdischarge is performed so that the battery voltage becomes equal to or lower than a predetermined value (discharge end voltage), the characteristics of the battery deteriorate.
At the time of discharging, a method of stopping discharging in which the battery voltage decreases to a threshold value corresponding to the discharge end voltage is adopted.

【0003】このように電池電圧を閾値と比較し、それ
に基づき二次電池の放電や充電を制御して放電終止電圧
を制御するなどの電池電圧制御を行う場合、従来では閾
値と比較すべき電池電圧を放電中や充電中に測定し、そ
れをそのまま閾値と比較している。ここで、測定される
電池電圧は、充放電の有無、充放電電流の大小、電池の
内部インピーダンスの影響を受ける。従来では、このよ
うな影響を受けた電池電圧に従って電池電圧制御を行っ
ていることになる。
[0003] In the case where the battery voltage is controlled by comparing the battery voltage with a threshold value and controlling the discharge and charge of the secondary battery based on the battery voltage to control the discharge end voltage, a battery to be compared with the threshold value is conventionally used. The voltage is measured during discharging and charging, and is compared with the threshold value as it is. Here, the measured battery voltage is affected by the presence / absence of charge / discharge, the magnitude of the charge / discharge current, and the internal impedance of the battery. Conventionally, battery voltage control is performed in accordance with such affected battery voltage.

【0004】二次電池は、充放電サイクルを経ることに
よって内部インピーダンスが増大する。例えば、充放電
サイクル初期の電池と充放電サイクルをかなり重ねた電
池とでは、内部インピーダンスは数十%もの違いが生じ
てくる。この内部インピーダンスの変化によって、実際
に電流が流れているときの電池電圧は相当の影響を受け
るため、適切な電池電圧制御を行うことが難しくなる。
[0004] The internal impedance of a secondary battery increases through a charge / discharge cycle. For example, the internal impedance of a battery at the beginning of a charge / discharge cycle and a battery having a considerable number of charge / discharge cycles have a difference of several tens of percent. The change in the internal impedance significantly affects the battery voltage when the current is actually flowing, making it difficult to perform appropriate battery voltage control.

【0005】例えば、放電終止電圧を制御する場合、内
部インピーダンスの大きい電池と内部インピーダンスの
小さな電池について同じ放電電流で放電を行い、かつ電
池電圧を同じ閾値と比較して放電終止電圧制御を行った
とする。このような場合、内部インピーダンスの大きい
電池は内部インピーダンスの小さい電池よりも電圧降下
が大きくなるために、測定される電池電圧は低くなり、
従って放電終止電圧制御は早くなされてしまう。
For example, when controlling the discharge end voltage, it is assumed that a battery having a large internal impedance and a battery having a small internal impedance are discharged at the same discharge current, and the discharge voltage is controlled by comparing the battery voltage with the same threshold value. I do. In such a case, since the battery with a large internal impedance has a larger voltage drop than the battery with a small internal impedance, the measured battery voltage is low,
Therefore, the discharge end voltage control is performed quickly.

【0006】同様に、同じ内部インピーダンスを持つ電
池について異なる放電電流で放電を行い、電池電圧を同
じ閾値と比較して放電終止電圧制御を行った場合には、
放電電流の大きい電池は放電電流の小さい電池よりも電
圧降下が大きくなるために、測定される電池電圧は低く
なり、放電終止電圧制御は早くなされてしまう。
Similarly, when batteries having the same internal impedance are discharged at different discharge currents and the battery voltage is compared with the same threshold value to perform the discharge termination voltage control,
Since a battery having a large discharge current has a larger voltage drop than a battery having a small discharge current, the measured battery voltage is low, and the discharge end voltage control is performed earlier.

【0007】放電終止電圧制御が早く行われてしまった
場合には、二次電池の本来の充電容量を生かすことがで
きず、実質的な使用時間が短くなってしまう。このよう
に、測定された電池電圧をそのまま用いて放電終止電圧
制御などの電池電圧制御を行うと、正しい制御ができな
いという問題がある。このような問題点を解決するた
め、電池電圧を電池電圧制御のための閾値と比較する
際、充放電を一旦止めた状態で電池電圧、つまり開放電
圧を測定する方法がある。開放電圧は充放電の有無、充
放電電流の大小、電池の内部インピーダンスなどの影響
を受けない電池電圧として測定されるため、これを用い
て電池電圧制御を行うことにより、的確な制御を行うこ
とが期待される。
[0007] If the discharge end voltage control is performed early, the original charge capacity of the secondary battery cannot be utilized, and the actual use time is shortened. As described above, if battery voltage control such as discharge end voltage control is performed using the measured battery voltage as it is, there is a problem that correct control cannot be performed. In order to solve such a problem, there is a method of measuring the battery voltage, that is, the open-circuit voltage while charging and discharging are temporarily stopped when comparing the battery voltage with a threshold value for battery voltage control. The open circuit voltage is measured as a battery voltage that is not affected by the presence / absence of charge / discharge, the magnitude of the charge / discharge current, the internal impedance of the battery, etc. There is expected.

【0008】しかしながら、この方法では開放電圧の測
定の都度、充放電電流を止める必要があるため、充電時
では充電電流を止めている時間分だけ充電時間が長くな
ってしまう。また、放電時では放電電流が止められてい
る期間は二次電池の使用機器に電力が供給されなくなっ
てしまうという不都合が生じる。
However, in this method, it is necessary to stop the charging / discharging current every time the open-circuit voltage is measured. Therefore, at the time of charging, the charging time becomes longer by the time during which the charging current is stopped. In addition, at the time of discharging, there is an inconvenience that power is not supplied to a device using the secondary battery while the discharge current is stopped.

【0009】一方、二次電池の充電量を電力量として測
定する方法として、電池電圧と充放電電流を用いて充電
量を算出する方法が知られている。この充電量の算出式
を以下に示す。 W=I*VB *t/3600[Wh] …(1) ここで、Iは充放電電流、VB は測定された電池電圧、
tは時間であり、Wは充電量、つまり単位時間当たりの
電力量である。
On the other hand, as a method of measuring the amount of charge of a secondary battery as electric energy, a method of calculating the amount of charge using a battery voltage and a charge / discharge current is known. The calculation formula of this charge amount is shown below. W = I * VB * t / 3600 [Wh] (1) where I is the charge / discharge current, VB is the measured battery voltage,
t is time, and W is the amount of charge, that is, the amount of power per unit time.

【0010】従来では、このように二次電池の充電量を
測定する際、電池電圧(VB)として充放電電流が流れて
いても流れていなくとも、単純に測定した値をそのまま
用いていた。従って、測定される充電量の電力量は、充
放電の有無、充放電電流の大小、電池の内部インピーダ
ンスなどの影響を受ける。このため、測定される電力量
は充電時では本来の電力量よりも大きくなってしまい、
放電時では本来の電力量よりも小さくなってしまうとい
う問題がある。
Conventionally, when the charge amount of the secondary battery is measured as described above, a simply measured value is used as it is regardless of whether a charge / discharge current flows as a battery voltage (VB). Therefore, the measured electric energy of the charged amount is affected by the presence / absence of charge / discharge, the magnitude of the charge / discharge current, the internal impedance of the battery, and the like. For this reason, the measured electric energy becomes larger than the original electric energy at the time of charging,
At the time of discharging, there is a problem that the electric power becomes smaller than the original electric energy.

【0011】[0011]

【発明が解決しようとする課題】上述したように、従来
の技術では二次電池の電池電圧制御を行う場合、測定し
た電池電圧をそのまま閾値と比較するため、電池電圧制
御が電池の充放電の有無、充放電電流の大小、電池の内
部インピーダンスなどの影響を受け、適切な制御ができ
ないという問題があり、また充放電を一旦止めた状態で
電池の開放電圧を測定する方法では、開放電圧の測定の
都度、充放電電流を止める必要があるため、充電時では
充電電流を止めている時間分だけ充電時間が長くなり、
放電時では放電電流が止められている期間は二次電池の
使用機器に電力が供給されなくなってしまうという不都
合が生じる問題があった。
As described above, in the prior art, when battery voltage control of a secondary battery is performed, the measured battery voltage is directly compared with a threshold value. There is a problem that proper control cannot be performed due to the influence of the presence / absence, the magnitude of the charge / discharge current, the internal impedance of the battery, and the like. It is necessary to stop the charge / discharge current each time the measurement is performed.
At the time of discharging, there is a problem in that power is not supplied to equipment using the secondary battery while the discharge current is stopped.

【0012】さらに、二次電池の充電量を電力量として
測定するために電池電圧と充放電電流を用いて充電量を
算出する方法では、測定される充電量の電力量が充放電
の有無、充放電電流の大小、電池の内部インピーダンス
などの影響を受けるため、測定される電力量は充電時で
は本来の電力量よりも大きくなってしまい、放電時では
本来の電力量よりも小さくなってしまうという問題があ
った。
Further, in the method of calculating the amount of charge using the battery voltage and the charge / discharge current in order to measure the amount of charge of the secondary battery as the amount of power, the amount of power of the measured amount of charge indicates whether or not charge / discharge has occurred. Due to the influence of the charge / discharge current, the internal impedance of the battery, etc., the measured electric energy becomes larger than the original electric energy during charging and becomes smaller than the original electric energy during discharging. There was a problem.

【0013】本発明は上記の問題点を解消するためにな
されたもので、その目的は二次電池の充放電の有無、充
放電電流の大小、電池の内部インピーダンスなどの影響
を受けることなく、また充放電を止めることなく適切な
電池電圧制御を行うことができる電池電圧測定装置を提
供することにある。
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to eliminate the influence of the presence / absence of charging / discharging of a secondary battery, the magnitude of charging / discharging current, the internal impedance of the battery, and the like. Another object of the present invention is to provide a battery voltage measuring device capable of performing appropriate battery voltage control without stopping charging and discharging.

【0014】また、本発明の他の目的は、このような電
池電圧測定装置を用いて、二次電池の充放電の有無、充
放電電流の大小、電池の内部インピーダンスなどの影響
を受けることなく正確に充電量を電力量として測定でき
る充電量測定装置を提供することにある。
Another object of the present invention is to use such a battery voltage measuring device without being affected by the presence or absence of charging / discharging of the secondary battery, the magnitude of the charging / discharging current, the internal impedance of the battery, and the like. An object of the present invention is to provide a charge amount measuring device capable of accurately measuring a charge amount as an electric energy.

【0015】[0015]

【課題を解決するための手段】上記の課題を解決するた
め、本発明に係る電池電圧測定装置は二次電池の充電電
流をオン・オフ制御する充電電流制御手段と、二次電池
の電池電圧を測定する電圧測定手段と、この電圧測定手
段により測定された充電電流のオン時およびオフ時の電
池電圧と充電電流から二次電池の内部インピーダンスを
算出する内部インピーダンス算出手段と、この内部イン
ピーダンスに基づいて電圧測定手段により測定された電
池電圧を補正する補正手段とを備えたことを特徴とす
る。
In order to solve the above-mentioned problems, a battery voltage measuring device according to the present invention comprises a charging current control means for controlling on / off of a charging current of a secondary battery, and a battery voltage of the secondary battery. Voltage measuring means for measuring the internal impedance of the secondary battery from the battery voltage and the charging current at the time of ON and OFF of the charging current measured by the voltage measuring means, and the internal impedance Correction means for correcting the battery voltage measured by the voltage measurement means based on the voltage.

【0016】より具体的には、内部インピーダンス算出
手段では電圧測定手段により測定された充電電流のオン
時およびオフ時の電池電圧VB1およびVB2と充電電流I
cから、二次電池の内部インピーダンスRint をRint
=(VB1−VB2)/Icによって算出する。
More specifically, in the internal impedance calculating means, the battery voltages VB1 and VB2 and the charging current I when the charging current measured by the voltage measuring means is ON and OFF.
From c, the internal impedance Rint of the secondary battery is calculated as Rint
= (VB1 -VB2) / Ic.

【0017】また、この内部インピーダンスRint に基
づいて電圧測定手段により測定された電池電圧を補正す
る補正手段は、二次電池の充電時は充電電流をIc、電
圧測定手段により測定された電池電圧をVB3としたと
き、VB3を VB4=VB3−Ic*Rint により補正し、二次電池の放電時は放電電流をId、電
池電圧をVB5としたとき、VB5を VB6=VB5+Id*Rint により補正する。
The correcting means for correcting the battery voltage measured by the voltage measuring means on the basis of the internal impedance Rint includes a charging current Ic at the time of charging the secondary battery and a battery voltage measured by the voltage measuring means. When VB3 is set, VB3 is corrected by VB4 = VB3−Ic * Rint. When the secondary battery is discharged, the discharge current is set to Id, and when the battery voltage is set to VB5, VB5 is corrected by VB6 = VB5 + Id * Rint.

【0018】さらに、本発明に係る電池電圧測定装置
は、二次電池の充放電路に直列に挿入されたスイッチ素
子と、充放電路に直列に挿入された電流検出用抵抗を含
み、二次電池の充電電流または放電電流を測定する電流
測定手段と、二次電池の電池電圧を測定する電圧測定手
段と、これら電流測定手段および電圧測定手段の測定結
果から二次電池の内部インピーダンスを算出する内部イ
ンピーダンス算出手段と、この内部インピーダンスに基
づいて電圧測定手段により測定された電池電圧を補正す
る補正手段とを備え、内部インピーダンス算出手段は、
スイッチ素子のオン時に電流測定手段により測定された
充電電流と電圧測定手段により測定された電池電圧およ
びスイッチ素子のオフ時に電圧測定手段により測定され
た電池電圧から二次電池の内部インピーダンスを算出す
ることを特徴とする。
Further, the battery voltage measuring device according to the present invention comprises a switch element inserted in series in a charging / discharging path of a secondary battery, and a current detecting resistor inserted in series in the charging / discharging path. Current measuring means for measuring the charging current or discharging current of the battery, voltage measuring means for measuring the battery voltage of the secondary battery, and calculating the internal impedance of the secondary battery from the measurement results of the current measuring means and the voltage measuring means. Internal impedance calculating means, comprising a correcting means for correcting the battery voltage measured by the voltage measuring means based on the internal impedance, the internal impedance calculating means,
Calculating the internal impedance of the secondary battery from the charging current measured by the current measuring means when the switch element is on, the battery voltage measured by the voltage measuring means, and the battery voltage measured by the voltage measuring means when the switch element is off. It is characterized by.

【0019】このように本発明に係る電池電圧測定装置
では、二次電池の充放電の有無、充放電電流の大小、電
池の内部インピーダンスなどの影響を考慮して補正した
電池電圧が最終的な電池電圧として測定される。従っ
て、これらの影響を受けることなく、また二次電池の充
放電を止めることなしに、終始電圧制御などの電池電圧
制御を的確に行うことが可能となる。
As described above, in the battery voltage measuring device according to the present invention, the battery voltage corrected in consideration of the influence of the secondary battery charging / discharging, the magnitude of the charging / discharging current, the internal impedance of the battery, etc. Measured as battery voltage. Therefore, it is possible to accurately perform battery voltage control such as voltage control from start to finish without being affected by the above and without stopping charging and discharging of the secondary battery.

【0020】本発明に係る充電量測定装置は、上述した
電池電圧測定装置と、この電池電圧測定装置により得ら
れた電池電圧と二次電池の充電電流または放電電流を用
いて二次電池の充電量を算出する充電量算出手段とを備
えたことを特徴とする。
[0020] A charged amount measuring device according to the present invention comprises a battery voltage measuring device as described above, and a battery voltage and a charging current or discharging current of the secondary battery obtained by the battery voltage measuring device. Charge amount calculation means for calculating the amount.

【0021】より具体的には、充電量算出手段は二次電
池の充電時は電池電圧測定装置により得られた電池電圧
をVB4とし、二次電池の充電電流をIcとし、充電量の
算出時間間隔をtとしたとき、 P=Ic*VB4*t/3600[Wh] により充電量Pを算出し、二次電池の放電時は電池電圧
測定装置により得られた電池電圧をVB6とし、二次電池
の放電電流をIdとし、充電量の算出時間間隔をtとし
たとき、 P=Id*VB4*t/3600[Wh] により充電量Pを算出することを特徴とする。
More specifically, the charging amount calculating means sets the battery voltage obtained by the battery voltage measuring device to VB4 when charging the secondary battery, sets the charging current of the secondary battery to Ic, and calculates the charging time. When the interval is t, the charge amount P is calculated by P = Ic * VB4 * t / 3600 [Wh]. When the secondary battery is discharged, the battery voltage obtained by the battery voltage measuring device is VB6. When the discharge current of the battery is Id and the calculation time interval of the charge amount is t, the charge amount P is calculated by P = Id * VB4 * t / 3600 [Wh].

【0022】このように構成される本発明の充電量測定
装置では、電池電圧測定装置で二次電池の充放電の有
無、充放電電流の大小、二次電池の内部インピーダンス
などの影響を考慮した補正後の電池電圧が求まることを
利用して、これらの影響を受けることなく、また二次電
池の充放電を止めることなしに、二次電池の充電量を電
力量として正確に測定することができる。
In the charge amount measuring apparatus of the present invention thus configured, the battery voltage measuring apparatus takes into account the influence of charging / discharging of the secondary battery, the magnitude of the charging / discharging current, the internal impedance of the secondary battery, and the like. Utilizing the fact that the corrected battery voltage is obtained, it is possible to accurately measure the charge amount of the secondary battery as an electric energy without being affected by these and without stopping charging and discharging of the secondary battery. it can.

【0023】[0023]

【発明の実施の形態】以下、図面を参照して本発明の実
施の形態を説明する。図1に、本発明の一実施形態に係
る電池電圧/充電量測定装置の構成を示す。この電池電
圧/充電量測定装置は、二次電池の電池電圧を測定して
補正し、さらに測定および補正された電池電圧に基づい
て充電量を電力量で測定する装置であり、例えば電池パ
ック内に組み込まれる。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a battery voltage / charge amount measuring device according to an embodiment of the present invention. This battery voltage / charge amount measurement device is a device that measures and corrects the battery voltage of a secondary battery, and further measures the charge amount in terms of electric energy based on the measured and corrected battery voltage. Incorporated in

【0024】図1において、二次電池1は例えばリチウ
ムイオン電池やニッケル水素電池などであり、その種別
は特に問わない。この二次電池1の正極側はその充放電
路のオン・オフ、すなわち充電電流のオン・オフを行う
ための充放電路スイッチ2を介して+側の外部接続端子
4に接続され、負極側は電流検出用抵抗3を介して−側
の外部接続端子5に接続されている。外部接続端子4,
5は、二次電池1の充電時は図示しない充電器に接続さ
れ、放電時は電池パックを電源として使用する図示しな
い使用機器に接続されるものとする。
In FIG. 1, the secondary battery 1 is, for example, a lithium ion battery or a nickel hydride battery, and the type thereof is not particularly limited. The positive electrode side of the secondary battery 1 is connected to an external connection terminal 4 on the + side through a charge / discharge path switch 2 for turning on / off the charge / discharge path, that is, turning on / off the charging current. Is connected to the negative side external connection terminal 5 via the current detecting resistor 3. External connection terminal 4,
Numeral 5 is connected to a charger (not shown) when charging the secondary battery 1, and connected to a device (not shown) that uses the battery pack as a power source when discharging the secondary battery 1.

【0025】マイクロコンピュータ6は機能的に表され
ており、CPU11、充放電路スイッチ2の制御を行う
スイッチ制御部12、電流検出用抵抗3を介して充電電
流や放電電流を測定するための電流測定部13、電池電
圧を測定するための電圧測定部14、二次電池1の内部
インピーダンスやそれに基づく電池電圧測定(補正)お
よび充電量の算出を行うための演算部15、測定中に得
られる各種データを一時的に蓄えるためのRAM16お
よび外部との通信を行うための通信インタフェース17
をバス18により接続して構成される。このマイクロコ
ンピュータ6によって、以下に示すように二次電池1の
電池電圧の測定(補正を含む)と充電量の測定が行われ
る。
The microcomputer 6 is functionally represented, and includes a CPU 11, a switch controller 12 for controlling the charge / discharge path switch 2, and a current for measuring a charging current and a discharging current via the current detecting resistor 3. A measuring unit 13, a voltage measuring unit 14 for measuring the battery voltage, an arithmetic unit 15 for measuring (correcting) the battery voltage based on the internal impedance of the secondary battery 1 and calculating the charged amount, and calculating the amount of charge based on the internal impedance. RAM 16 for temporarily storing various data and communication interface 17 for communicating with the outside
Are connected by a bus 18. The microcomputer 6 measures the battery voltage (including correction) and the charge amount of the secondary battery 1 as described below.

【0026】次に、本実施形態における電池電圧の測定
手順について図2および図3に示すフローチャートを用
いて説明する。まず、図2のフローチャートに示す手順
で二次電池1の内部インピーダンスを測定する。すなわ
ち、CPU11による制御下でスイッチ制御部12によ
り充放電路スイッチ2をオンにする(ステップS1)。
そして、CPU11による制御下で電流測定部13によ
り電流検出用抵抗3の両端電圧から充電電流Icを測定
し(ステップS2)、さらに電圧測定部14により二次
電池1の両端電圧(電池電圧)VB1を測定する(ステッ
プS3)。なお、電流検出部13および電圧検出部14
はA/D変換器を含んで構成され、このA/D変換器は
一般には電流検出部13と電圧検出部14とで共用され
る。
Next, the procedure for measuring the battery voltage in the present embodiment will be described with reference to the flowcharts shown in FIGS. First, the internal impedance of the secondary battery 1 is measured according to the procedure shown in the flowchart of FIG. That is, the charge / discharge path switch 2 is turned on by the switch control unit 12 under the control of the CPU 11 (step S1).
Then, under the control of the CPU 11, the charging current Ic is measured from the voltage across the current detecting resistor 3 by the current measuring unit 13 (step S2), and the voltage (battery voltage) VB1 across the secondary battery 1 is further measured by the voltage measuring unit 14. Is measured (step S3). Note that the current detection unit 13 and the voltage detection unit 14
Is configured to include an A / D converter, and this A / D converter is commonly used by the current detection unit 13 and the voltage detection unit 14.

【0027】次に、スイッチ制御部12により充放電路
スイッチ2をオフにし(ステップS4)、この状態で電
圧測定部14により二次電池1の電池電圧VB2を測定す
る(ステップS5)。こうしてステップS2、S3およ
びS4により測定された充電電流Ic、電池電圧VB1お
よびVB2のデータは、CPU11による制御下でRAM
16に記憶される。
Next, the charge / discharge path switch 2 is turned off by the switch control unit 12 (step S4), and the battery voltage VB2 of the secondary battery 1 is measured by the voltage measuring unit 14 in this state (step S5). The data of the charging current Ic and the battery voltages VB1 and VB2 measured in steps S2, S3 and S4 are stored in the RAM under the control of the CPU 11.
16 is stored.

【0028】次に、CPU11による制御下で、RAM
16からIc、VB1およびVB2のデータを読み出し、演
算部15によって二次電池1の内部インピーダンスRin
t を次式により算出する(ステップS6)。 Rint =(VB1−VB2)/Ic …(2) このステップS6で算出された内部インピーダンスRin
t のデータは、CPU11による制御下でRAM16に
記憶される。
Next, under the control of the CPU 11, the RAM
16, the data of Ic, VB1 and VB2 are read out, and the internal impedance Rin of the secondary battery 1 is
t is calculated by the following equation (step S6). Rint = (VB1−VB2) / Ic (2) The internal impedance Rin calculated in step S6
The data of t is stored in the RAM 16 under the control of the CPU 11.

【0029】次に、図3に示すフローチャートを用い
て、上述した内部インピーダンス測定手順を含む電池電
圧測定手順を説明する。図3において、ステップS10
は図2に示した内部インピーダンス測定手順を示してい
る。ステップS10で二次電池1の内部インピーダンス
を測定した後、充放電モードの判定、すなわち二次電池
1が充電モードにあるか、放電モードにあるか、あるい
は自己放電モードにあるかの判定を行う(ステップS1
1)。
Next, a battery voltage measurement procedure including the above-described internal impedance measurement procedure will be described with reference to the flowchart shown in FIG. In FIG. 3, step S10
Shows the procedure for measuring the internal impedance shown in FIG. After measuring the internal impedance of the secondary battery 1 in step S10, the charge / discharge mode is determined, that is, whether the secondary battery 1 is in the charge mode, the discharge mode, or the self-discharge mode is determined. (Step S1
1).

【0030】この充放電モードの判定は、充放電路スイ
ッチ2がオンの状態での電流測定部13の測定結果に基
づいて、CPU11により行われる。すなわち、電流測
定部13の測定結果から充放電路に充電方向に電流が流
れている場合には、充電モードであると判定され、放電
方向に電流が流れている場合には、放電モードであると
判定され、さらに充放電電流が平均的に零の場合には、
自己放電モードであると判定される。
The determination of the charging / discharging mode is performed by the CPU 11 based on the measurement result of the current measuring unit 13 when the charging / discharging path switch 2 is on. That is, when the current flows in the charging / discharging path in the charging direction from the measurement result of the current measuring unit 13, it is determined that the current mode is the charging mode. When the current flows in the discharging direction, the current mode is the discharging mode. If the charge / discharge current is zero on average,
It is determined that the mode is the self-discharge mode.

【0031】ここで、ステップS11において充電モー
ドと判定された場合には、ステップS12で電圧測定部
14により電池電圧VB3を測定し、さらにステップS1
3で電流測定部13により充電電流Icを測定した後、
ステップS14で次式により電池電圧VB3の補正を行
う。 VB4=VB3−Ic*Rint …(3) ここで、VB4が補正後の電池電圧であり、このVB4が電
池電圧制御のための閾値と比較され、その結果に従って
電池電圧制御が行われる。
If the charging mode is determined in step S11, the battery voltage VB3 is measured by the voltage measuring unit 14 in step S12.
After measuring the charging current Ic by the current measuring unit 13 in 3,
In step S14, the battery voltage VB3 is corrected by the following equation. VB4 = VB3-Ic * Rint (3) Here, VB4 is a corrected battery voltage, and this VB4 is compared with a threshold value for battery voltage control, and the battery voltage control is performed according to the result.

【0032】一方、ステップS11において放電モード
と判定された場合には、ステップS15で電圧測定部1
4により電池電圧VB5を測定し、さらにステップS16
で電流測定部13により放電電流Idを測定した後、ス
テップS17で次式により電池電圧VB5の補正を行う。 VB6=VB5+Id*Rint …(4) ここで、VB6が補正後の電池電圧であり、このVB5が電
池電圧制御のための閾値と比較され、その結果に従って
電池電圧制御が行われる。
On the other hand, when it is determined in step S11 that the discharge mode is set, the voltage measuring unit 1 is determined in step S15.
4, the battery voltage VB5 is measured, and further, step S16
After measuring the discharge current Id by the current measuring unit 13 in step S17, the battery voltage VB5 is corrected by the following equation in step S17. VB6 = VB5 + Id * Rint (4) Here, VB6 is the corrected battery voltage, and this VB5 is compared with a threshold value for battery voltage control, and the battery voltage control is performed according to the result.

【0033】さらに、ステップS11において自己放電
モードと判定された場合には、ステップS18で電圧測
定部14により電池電圧VB7を測定する。ここで、二次
電池1の内部インピーダンスRint を考慮すると、充電
モードおよび放電モードと同様の考え方からすれば、電
池電圧VB7を次式により補正する必要があると考えられ
る。
Further, when the self-discharge mode is determined in step S11, the battery voltage VB7 is measured by the voltage measuring unit 14 in step S18. Here, when the internal impedance Rint of the secondary battery 1 is considered, it is considered that the battery voltage VB7 needs to be corrected by the following equation in the same way as in the charging mode and the discharging mode.

【0034】 VB8=VB7±I*Rint …(5) しかし、充放電モードでは充放電電流はI=0であるか
ら、結局VB8=VB7となる。すなわち、充放電モードで
は電圧測定部14で測定された電池電圧VB7を補正する
ことなくそのまま使用すればよく、このVB7が電池電圧
制御のための閾値と比較され、その結果に従って電池電
圧制御が行われる。
VB8 = VB7 ± I * Rint (5) However, since the charge / discharge current is I = 0 in the charge / discharge mode, VB8 = VB7. That is, in the charge / discharge mode, the battery voltage VB7 measured by the voltage measuring unit 14 may be used without correction, and this VB7 is compared with a threshold value for battery voltage control, and the battery voltage control is performed according to the result. Will be

【0035】そして、ステップS14、S17またはS
18の処理により、一連の処理は終了する。なお、上述
した電池電圧測定の一連の処理は、二次電池1が予め定
められた充放電サイクル回数の達する毎に、あるいは所
定の時間が経過する毎に繰り返される。
Then, step S14, S17 or S
A series of processes ends by the process of 18. Note that the above-described series of battery voltage measurement processes is repeated each time the secondary battery 1 reaches a predetermined number of charge / discharge cycles or every time a predetermined time elapses.

【0036】以上述べたように、本実施形態によれば二
次電池1の充放電の有無、充放電電流の大小、二次電池
1の内部インピーダンスRint などの影響を考慮した補
正後の電池電圧VB4,VB6を求めることができる。従っ
て、これらの影響を受けることなく、また二次電池1の
充放電を止めることなしに、終始電圧制御などの電池電
圧制御を的確に行うことが可能となる。
As described above, according to the present embodiment, the corrected battery voltage in consideration of the influence of the charging / discharging of the secondary battery 1, the magnitude of the charging / discharging current, the internal impedance Rint of the secondary battery 1, and the like. VB4 and VB6 can be obtained. Therefore, it is possible to accurately perform battery voltage control such as voltage control from start to finish without being affected by the above and without stopping charging and discharging of the secondary battery 1.

【0037】次に、図4に示すフローチャートを用い
て、上述した電池電圧測定手順を利用して二次電池1の
充電量を電力量として測定する手順を説明する。図4に
おいて、ステップS20は図2に示した内部インピーダ
ンス測定手順を示している。ステップS20で二次電池
1の内部インピーダンスを測定した後、充放電モードの
判定、すなわち二次電池1が充電モードにあるか、放電
モードにあるか、あるいは自己放電モードにあるかの判
定を行う(ステップS21)。
Next, a procedure for measuring the charge amount of the secondary battery 1 as an electric energy using the above-described battery voltage measurement procedure will be described with reference to the flowchart shown in FIG. In FIG. 4, step S20 shows the internal impedance measurement procedure shown in FIG. After measuring the internal impedance of the secondary battery 1 in step S20, the charge / discharge mode is determined, that is, whether the secondary battery 1 is in the charge mode, the discharge mode, or the self-discharge mode is determined. (Step S21).

【0038】この充放電モードの判定は、前述したよう
に充放電路スイッチ2がオンの状態での電流測定部13
の測定結果に基づいて、CPU11により行われる。す
なわち、電流測定部13の測定結果から充放電路に充電
方向に電流が流れている場合には、充電モードであると
判定され、放電方向に電流が流れている場合には、放電
モードであると判定され、さらに充放電電流が平均的に
零の場合には、自己放電モードであると判定される。
The determination of the charging / discharging mode is performed by the current measuring unit 13 with the charging / discharging path switch 2 turned on as described above.
The measurement is performed by the CPU 11 based on the measurement result. That is, when the current flows in the charging / discharging path in the charging direction from the measurement result of the current measuring unit 13, it is determined that the current mode is the charging mode. When the current flows in the discharging direction, the current mode is the discharging mode. When the charge / discharge current is zero on average, it is determined that the self-discharge mode is set.

【0039】ここで、ステップS21において充電モー
ドと判定された場合には、ステップS22で電圧測定部
14により電池電圧VB3を測定し、さらにステップS2
3で電流測定部13により充電電流Icを測定した後、
ステップS24で次式により充電量Pを単位時間当たり
の電力量として算出する。 P=Ic*VB4*t/3600[Wh] …(6) なお、VB4は先に述べた電池電圧測定手順における補正
後の電池電圧であり、式(3)により求められる。t
は、充電量の算出時間間隔(加・減算を行う時間間隔)
である。
If it is determined in step S21 that the charging mode is set, the battery voltage VB3 is measured by the voltage measuring unit 14 in step S22.
After measuring the charging current Ic by the current measuring unit 13 in 3,
In step S24, the charge amount P is calculated as the electric energy per unit time by the following equation. P = Ic * VB4 * t / 3600 [Wh] (6) Here, VB4 is the battery voltage after the correction in the battery voltage measurement procedure described above, and is obtained by equation (3). t
Is the charge time calculation time interval (time interval for adding / subtracting)
It is.

【0040】一方、ステップS21において放電モード
と判定された場合には、ステップS25で電圧測定部1
4により電池電圧VB5を測定し、さらにステップS26
で電流測定部13により放電電流Idを測定した後、ス
テップS27で次式により充電量Pを単位時間当たりの
電力量として算出する。 P=Ic*VB6*t/3600[Wh] …(7) なお、VB6は先に述べた電池電圧測定手順における補正
後の電池電圧であり、式(4)により求められる。ま
た、tは充電量の算出時間間隔(加・減算を行う時間間
隔)である。
On the other hand, when it is determined in step S21 that the discharge mode is set, the voltage measuring unit 1 is determined in step S25.
4, the battery voltage VB5 is measured, and the process proceeds to step S26.
After the discharging current Id is measured by the current measuring unit 13 in step S27, the charge amount P is calculated as the amount of power per unit time by the following equation in step S27. P = Ic * VB6 * t / 3600 [Wh] (7) where VB6 is the battery voltage after the correction in the battery voltage measurement procedure described above, and is obtained by equation (4). Further, t is a time interval for calculating the amount of charge (a time interval for performing addition / subtraction).

【0041】さらに、ステップS21において自己放電
モードと判定された場合には、ステップS28で電圧測
定部14により電池電圧VB7を測定する。二次電池1の
内部インピーダンスRint を考慮すると、充電モードお
よび放電モードと同様の考え方からすれば、電池電圧V
B7を式(5)により補正する必要があると考えられる
が、前述したように充放電モードでは充放電電流はI=
0であるから、電圧測定部14で測定された電池電圧V
B7を補正することなくそのまま使用すればよい。すなわ
ち、この電池電圧VB7を用いて次式により充電量Pを算
出すればよいと考えられる。 P=I*VB7*t/3600[Wh] …(8) しかし、充放電モードではI=0であるから、結局、充
電量は P=0[Wh] …(9) ということになる(ステップS29)。
Further, when the self-discharge mode is determined in step S21, the battery voltage VB7 is measured by the voltage measuring unit 14 in step S28. When the internal impedance Rint of the secondary battery 1 is considered, the battery voltage V
Although it is considered that B7 needs to be corrected by equation (5), as described above, the charge / discharge current is I =
0, the battery voltage V measured by the voltage measuring unit 14
B7 can be used without correction. That is, it is considered that the charge amount P may be calculated by the following equation using the battery voltage VB7. P = I * VB7 * t / 3600 [Wh] (8) However, since I = 0 in the charge / discharge mode, the charge amount eventually becomes P = 0 [Wh] (9) (step) S29).

【0042】以上述べたように、本実施形態によれば前
述のように二次電池1の充放電の有無、充放電電流の大
小、二次電池1の内部インピーダンスRint などの影響
を考慮した補正後の電池電圧VB4,VB6を求めることが
できることを利用して、これらの影響を受けることな
く、また二次電池1の充放電を止めることなしに、二次
電池1の充電量Pを電力量として正確に測定することが
できる。
As described above, according to the present embodiment, as described above, correction is performed in consideration of the influence of the presence or absence of charge / discharge of the secondary battery 1, the magnitude of the charge / discharge current, the internal impedance Rint of the secondary battery 1, and the like. Utilizing the fact that the later battery voltages VB4 and VB6 can be obtained, the charge amount P of the secondary battery 1 can be reduced by the power amount without being affected by these factors and without stopping the charging and discharging of the secondary battery 1. Can be measured accurately.

【0043】なお、本発明は上述した実施形態に限定さ
れるものではなく、次のように種々変形して実施するこ
とができる。例えば、上記実施形態では電池パック内で
の電池電圧制御に係る電池電圧測定および充電量測定に
ついて説明したが、図1に示したように通信インタフェ
ース17を設けて電池パックに通信機能を持たせ、電池
パックから使用機器側に電池1の内部インピーダンスR
int のデータを送信することにより、使用機器側で転置
電圧の測定(補正)とそれに基づく電池電圧制御を行う
場合にも、本発明を適用することが可能である。また、
電池パックと使用機器の双方で、内部インピーダンスR
int のデータを使用しても構わない。
Note that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications as follows. For example, in the above embodiment, the battery voltage measurement and the charge amount measurement related to the battery voltage control in the battery pack have been described. However, as shown in FIG. 1, the communication interface 17 is provided so that the battery pack has a communication function. The internal impedance R of the battery 1 from the battery pack to the device used
By transmitting int data, the present invention can be applied to the case where the transposed voltage is measured (corrected) and the battery voltage is controlled based on the transposed voltage on the device used. Also,
In both the battery pack and the equipment used, the internal impedance R
You can use int data.

【0044】[0044]

【発明の効果】以上説明したように、本発明によれば二
次電池の充放電の有無、充放電電流の大小、電池の内部
インピーダンスなどの影響を受けることなく、また充放
電を止めることなく適切な電池電圧制御を行うことがで
きる電池電圧測定装置を提供することができる。
As described above, according to the present invention, the presence or absence of charging / discharging of the secondary battery, the magnitude of the charging / discharging current, the internal impedance of the battery, and the like, do not stop the charging / discharging. A battery voltage measuring device capable of performing appropriate battery voltage control can be provided.

【0045】また、本発明によればこのような電池電圧
測定装置を用いて、二次電池の充放電の有無、充放電電
流の大小、電池の内部インピーダンスなどの影響を受け
ることなく正確に充電量を電力量として測定できる充電
量測定装置を提供することができる。
Further, according to the present invention, using such a battery voltage measuring device, accurate charging can be performed without being affected by the presence or absence of charging / discharging of the secondary battery, the magnitude of the charging / discharging current, the internal impedance of the battery, and the like. It is possible to provide a charged amount measuring device capable of measuring an amount as an electric energy.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施形態に係る電池電圧測定/充電
量測定装置の構成を示すブロック図
FIG. 1 is a block diagram showing a configuration of a battery voltage measurement / charge amount measurement device according to an embodiment of the present invention.

【図2】同実施形態における二次電池の内部インピーダ
ンス測定手順を説明するためのフローチャート
FIG. 2 is a flowchart for explaining a procedure for measuring the internal impedance of the secondary battery in the embodiment.

【図3】同実施形態における電池電圧測定手順を説明す
るためのフローチャート
FIG. 3 is a flowchart for explaining a battery voltage measurement procedure in the embodiment.

【図4】同実施形態における充電量測定手順を説明する
ためのフローチャート
FIG. 4 is a flowchart for explaining a charge amount measurement procedure in the embodiment.

【符号の説明】[Explanation of symbols]

1…二次電池 2…充電路スイッチ 3…電流検出用抵抗 4…+側外部接続端子 5…−側外部接続端子 6…マイクロコンピュータ 11…CPU 12…スイッチ制御部 13…電流測定部 14…電圧測定部 15…演算部 16…RAM 17…通信インタフェース DESCRIPTION OF SYMBOLS 1 ... Secondary battery 2 ... Charge path switch 3 ... Current detection resistance 4 ... + side external connection terminal 5 ...- side external connection terminal 6 ... Microcomputer 11 ... CPU 12 ... Switch control part 13 ... Current measurement part 14 ... Voltage Measuring unit 15 ... Calculating unit 16 ... RAM 17 ... Communication interface

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】二次電池の充電電流をオン・オフ制御する
充電電流制御手段と、 前記二次電池の電池電圧を測定する電圧測定手段と、 前記電圧測定手段により測定された充電電流のオン時お
よびオフ時の電池電圧と充電電流から前記二次電池の内
部インピーダンスを算出する内部インピーダンス算出手
段と、 前記内部インピーダンスに基づいて前記電圧測定手段に
より測定された電池電圧を補正する補正手段とを備えた
ことを特徴とする二次電池の電池電圧測定装置。
1. A charging current control means for controlling on / off of a charging current of a secondary battery, a voltage measuring means for measuring a battery voltage of the secondary battery, and an on / off of a charging current measured by the voltage measuring means. And an internal impedance calculating means for calculating the internal impedance of the secondary battery from the battery voltage and the charging current at the time of off, and a correcting means for correcting the battery voltage measured by the voltage measuring means based on the internal impedance. A battery voltage measuring device for a secondary battery, comprising:
【請求項2】二次電池の充電電流をオン・オフ制御する
充電電流制御手段と、 前記二次電池の電池電圧を測定する電圧測定手段と、 前記電圧測定手段により測定された充電電流のオン時お
よびオフ時の電池電圧VB1およびVB2と充電電流Icか
ら前記二次電池の内部インピーダンスRint をRint =
(VB1−VB2)/Icを算出する内部インピーダンス算
出手段と、 前記内部インピーダンスRint に基づいて前記電圧測定
手段により測定された電池電圧を補正する補正手段とを
備え、 前記補正手段は、前記二次電池の充電時は充電電流をI
c、前記電圧測定手段により測定された電池電圧をVB3
としたとき、VB3を VB4=VB3−Ic*Rint により補正し、前記二次電池の放電時は放電電流をI
d、電池電圧をVB5としたとき、VB5を VB6=VB5+Id*Rint により補正することを特徴とする二次電池の電池電圧測
定装置。
2. A charging current control means for controlling on / off of a charging current of a secondary battery, a voltage measuring means for measuring a battery voltage of the secondary battery, and an on / off of a charging current measured by the voltage measuring means. The internal impedance Rint of the secondary battery from Rint = Rint =
An internal impedance calculating means for calculating (VB1-VB2) / Ic; and a correcting means for correcting the battery voltage measured by the voltage measuring means on the basis of the internal impedance Rint. When charging the battery, set the charging current to I
c, the battery voltage measured by the voltage measuring means is VB3
VB3 is corrected by VB4 = VB3−Ic * Rint, and when the secondary battery is discharged, the discharge current is I
d, a battery voltage measuring device for a secondary battery, wherein VB5 is corrected by VB6 = VB5 + Id * Rint when the battery voltage is VB5.
【請求項3】二次電池の充放電路に直列に挿入されたス
イッチ素子と、 前記充放電路に直列に挿入された電流検出用抵抗を含
み、前記二次電池の充電電流または放電電流を測定する
電流測定手段と、 前記二次電池の電池電圧を測定する電圧測定手段と、 前記電流測定手段および前記電圧測定手段の測定結果か
ら前記二次電池の内部インピーダンスを算出する内部イ
ンピーダンス算出手段と、 前記内部インピーダンスに基づいて前記電圧測定手段に
より測定された電池電圧を補正する補正手段とを備え、 前記内部インピーダンス算出手段は、前記スイッチ素子
のオン時に前記電流測定手段により測定された充電電流
と前記電圧測定手段により測定された電池電圧および前
記スイッチ素子のオフ時に前記電圧測定手段により測定
された電池電圧から前記二次電池の内部インピーダンス
を算出することを特徴とする電池電圧測定装置。
3. A switch element inserted in series in a charge / discharge path of a secondary battery, and a current detecting resistor inserted in series in the charge / discharge path, wherein a charge current or a discharge current of the secondary battery is detected. Current measuring means for measuring, voltage measuring means for measuring the battery voltage of the secondary battery, internal impedance calculating means for calculating the internal impedance of the secondary battery from the measurement results of the current measuring means and the voltage measuring means, Correction means for correcting the battery voltage measured by the voltage measurement means based on the internal impedance, wherein the internal impedance calculation means includes a charging current measured by the current measurement means when the switch element is turned on. The battery voltage measured by the voltage measuring means and the battery voltage measured by the voltage measuring means when the switch element is turned off. Battery voltage measuring device and calculates an internal impedance of the secondary battery from.
【請求項4】請求項1乃至4のいずれか1項に記載の電
池電圧測定装置と、 該電池電圧測定装置により得られた電池電圧と前記二次
電池の充電電流または放電電流を用いて前記二次電池の
充電量を算出する充電量算出手段とを備えたことを特徴
とする充電量測定装置。
4. A battery voltage measuring device according to claim 1, wherein said battery voltage measuring device uses a battery voltage obtained by said battery voltage measuring device and a charge current or a discharge current of said secondary battery. A charge amount measuring device comprising: a charge amount calculating unit that calculates a charge amount of a secondary battery.
【請求項5】前記充電量算出手段は、前記二次電池の充
電時は前記電池電圧測定装置により得られた電池電圧を
VB4とし、前記二次電池の充電電流をIcとし、充電量
の算出時間間隔をtとしたとき、 P=Ic*VB4*t/3600[Wh] により前記充電量Pを算出し、 前記二次電池の放電時は前記電池電圧測定装置により得
られた電池電圧をVB6とし、前記二次電池の放電電流を
Idとし、充電量の算出時間間隔をtとしたとき、 P=Id*VB6*t/3600[Wh] により前記充電量Pを算出することを特徴とする請求項
4に記載の充電量測定装置。
5. The charge amount calculating means calculates a charge amount by setting a battery voltage obtained by the battery voltage measuring device to VB4 and a charge current of the secondary battery to Ic when charging the secondary battery. When the time interval is t, the charge amount P is calculated by P = Ic * VB4 * t / 3600 [Wh]. When the secondary battery is discharged, the battery voltage obtained by the battery voltage measuring device is calculated as VB6. Where, when the discharge current of the secondary battery is Id and the time interval for calculating the charge amount is t, the charge amount P is calculated by P = Id * VB6 * t / 3600 [Wh]. The charge amount measuring device according to claim 4.
JP9158769A 1997-06-16 1997-06-16 Battery voltage measuring instrument and charging amount measuring instrument using it Pending JPH118940A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9158769A JPH118940A (en) 1997-06-16 1997-06-16 Battery voltage measuring instrument and charging amount measuring instrument using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9158769A JPH118940A (en) 1997-06-16 1997-06-16 Battery voltage measuring instrument and charging amount measuring instrument using it

Publications (1)

Publication Number Publication Date
JPH118940A true JPH118940A (en) 1999-01-12

Family

ID=15678947

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9158769A Pending JPH118940A (en) 1997-06-16 1997-06-16 Battery voltage measuring instrument and charging amount measuring instrument using it

Country Status (1)

Country Link
JP (1) JPH118940A (en)

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JP2004304940A (en) * 2003-03-31 2004-10-28 Fujitsu Ltd Battery pack, electronic apparatus, battery remaining capacity prediction system, and semiconductor device
JP2008113545A (en) * 2006-10-06 2008-05-15 Matsushita Electric Ind Co Ltd Discharge control unit
JP2008542995A (en) * 2005-05-27 2008-11-27 エルジー・ケム・リミテッド Battery cell voltage detection method and apparatus
US7459884B2 (en) 2004-04-27 2008-12-02 Sony Corporation Remaining capacity calculation method for secondary battery, and battery pack
JP2009281857A (en) * 2008-05-22 2009-12-03 Nissan Diesel Motor Co Ltd Voltage measuring system of power storage device
US8102155B2 (en) 2006-10-06 2012-01-24 Panasonic Corporation Discharge controller
JP2016171716A (en) * 2015-03-13 2016-09-23 エスアイアイ・セミコンダクタ株式会社 Battery residual amount prediction device and battery pack
US9622719B2 (en) 2013-02-26 2017-04-18 Allen Maizes Color ultrasound needle

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004045278A (en) * 2002-07-12 2004-02-12 Sony Ericsson Mobilecommunications Japan Inc Electronic equipment, monitor and method for monitoring voltage, recording medium, and program
JP2004304940A (en) * 2003-03-31 2004-10-28 Fujitsu Ltd Battery pack, electronic apparatus, battery remaining capacity prediction system, and semiconductor device
US7459884B2 (en) 2004-04-27 2008-12-02 Sony Corporation Remaining capacity calculation method for secondary battery, and battery pack
JP2008542995A (en) * 2005-05-27 2008-11-27 エルジー・ケム・リミテッド Battery cell voltage detection method and apparatus
JP2008113545A (en) * 2006-10-06 2008-05-15 Matsushita Electric Ind Co Ltd Discharge control unit
US8102155B2 (en) 2006-10-06 2012-01-24 Panasonic Corporation Discharge controller
JP2009281857A (en) * 2008-05-22 2009-12-03 Nissan Diesel Motor Co Ltd Voltage measuring system of power storage device
US9622719B2 (en) 2013-02-26 2017-04-18 Allen Maizes Color ultrasound needle
JP2016171716A (en) * 2015-03-13 2016-09-23 エスアイアイ・セミコンダクタ株式会社 Battery residual amount prediction device and battery pack

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