JP2003121514A - Internal impedance measuring method for storage battery - Google Patents
Internal impedance measuring method for storage batteryInfo
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- JP2003121514A JP2003121514A JP2001311716A JP2001311716A JP2003121514A JP 2003121514 A JP2003121514 A JP 2003121514A JP 2001311716 A JP2001311716 A JP 2001311716A JP 2001311716 A JP2001311716 A JP 2001311716A JP 2003121514 A JP2003121514 A JP 2003121514A
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- storage battery
- storage
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- storage batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Measurement Of Resistance Or Impedance (AREA)
- Tests Of Electric Status Of Batteries (AREA)
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Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、蓄電池の内部イン
ピーダンス測定方法に関する。
【０００２】
【従来の技術】蓄電池の内部インピーダンスを測定する
ことによって該蓄電池の寿命や残存容量を知ることは以
前から行なわれている。従来の蓄電池の内部インピーダ
ンス測定方法は、図３（ａ）または（ｂ）に示すよう
に、複数（図の場合は７個）の直列接続された蓄電池１
１，１２，１３，１４，１５，１６，１７の中の被測定
蓄電池１１の陽極と陰極との間に定電流交流発生源２０
から定電流交流成分の測定電流（充放電電流）を通電
し、被測定蓄電池１１の両極端子間に発生する起電力を
電圧計３０で測定し、この起電力から被測定蓄電池１１
の内部インピーダンスを測定するという方法であった。
【０００３】この方法は、図３（ａ）に示すように、蓄
電池１１〜１６に定電圧電源４０や負荷５０等の機器が
接続されていない場合には、定電流交流発生源２０から
の測定電流が全て被測定蓄電池１１に通電されるため被
測定蓄電池１１の内部インピーダンスを精度よく測定で
きるが、図３（ｂ）に示すように、蓄電池１１〜１６に
定電圧電源４０や負荷５０等の機器が接続されていた場
合には、定電流交流発生源２０からの測定電流の一部が
定電圧電源４０や負荷５０等の機器に流れ込んでしまう
ため、被測定蓄電池１１の内部インピーダンスを正確に
測定することはできなかった。
【０００４】このため、被測定蓄電池１１を定電圧電源
４０や負荷５０等の機器から切り離して該被測定蓄電池
１１の内部インピーダンスを測定することが精度の面か
らみて好ましいが、実際に使用されている蓄電池は定電
圧電源４０や負荷５０等の機器に接続されており、蓄電
池をこれらの機器からわざわざ切り離して内部インピー
ダンスを測定することは、保守管理の簡素化や蓄電池の
有効利用の面を考慮すると好ましくなかった。
【０００５】
【発明が解決しようとする課題】上述したように、従来
の蓄電池の内部インピーダンス測定方法においては、被
測定蓄電池１１を定電圧電源４０や負荷５０等の機器か
ら切り離さないで測定した場合に測定誤差を生じ、正確
に内部インピーダンスを測定できないという問題があっ
た。
【０００６】本発明はこのような事情に基づいてなされ
たもので、その目的とするところは、ことができる蓄電
池の内部インピーダンス測定方法を提供しようとするも
のである。
【０００７】
【課題を解決するための手段】請求項１に係る発明は、
複数の直列接続された蓄電池に負荷を接続した状態で、
該蓄電池の内部インピーダンスを測定する方法におい
て、複数の蓄電池のうち被測定蓄電池を含むｎ（ｎ≧
２）個の蓄電池に定電流交流成分の測定電流を通電して
被測定蓄電池の両極間に生じる起電力を測定するととも
に、ｎ個の蓄電池の中の被測定蓄電池を含むｍ（ｍ＜
ｎ）個の蓄電池に定電流交流成分の測定電流を通電して
被測定蓄電池の両極間に生じる起電力を測定し、ｎ個の
蓄電池に定電流交流成分の測定電流を通電したときの被
測定蓄電池の両極間に生じる起電力とｍ個の蓄電池に定
電流交流成分の測定電流を通電したときの被測定蓄電池
の両極間に生じる起電力との変化量とから、被測定蓄電
池を負荷から切り離した状態で該被測定蓄電池に測定電
流を通電したときの発生起電力を算出し、この発生起電
力に基づいて被測定蓄電池の内部インピーダンスを測定
するようにしたものである。
【０００８】
【発明の実施の形態】以下、本発明に関わる蓄電池の内
部インピーダンス測定方法の一実施の形態を、図１及び
図２を用いて説明する。
【０００９】なお、この実施の形態は、図１に示すよう
に、７個の直列接続された蓄電池１１，１２，１３，１
４，１５，１６，１７に定電圧電源４０と負荷５０がそ
れぞれ並列に接続された状態で、被測定蓄電池１１の内
部インピーダンスを測定する場合である。
【００１０】はじめに、本実施の形態は、第１のステッ
プとして、７個の直列接続された蓄電池１１〜１７のう
ち被測定蓄電池１１を含むｎ（ｎ≧２）個の連続する蓄
電池（図では蓄電池１１，１２，１３の３個とする）の
両極間に切替スイッチ６０を介して定電流交流発生源２
０を接続する。そして、定電流交流発生源２０から定電
流交流成分の測定電流をｎ個の蓄電池１１，１２，１３
に通電して、該蓄電池１１，１２，１３毎にその両極間
に生じる起電力Ｖ３１，Ｖ３２，Ｖ３３をそれぞれ電圧
計３１，３２，３３で測定する。
【００１１】次に、第２のステップとして、前記切替ス
イッチ６０を切替えて、上記ｎ個の蓄電池１１，１２，
１３の中の被測定蓄電池１１を含むｍ（ｍ＜ｎ）個の蓄
電池（図では被測定蓄電池１１の１個する）の両極間に
前記定電流交流発生源２０を接続する。そして、定電流
交流発生源２０から定電流交流成分の測定電流を被測定
蓄電池１１に通電して、該蓄電池１１の両極間に生じる
起電力Ｖ１１を電力計３１で測定する。
【００１２】なお、上記第１のステップと第２のステッ
プは、その順番を入れ替えてもよい。つまり、先に第２
のステップを実行し、その後、切替スイッチ６０を切替
えて第１のステップを実行してもよい。
【００１３】次に、第３のステップとして、ｎ個の蓄電
池１１，１２，１３に定電流交流成分の測定電流を通電
したときの被測定蓄電池１１の両極間に生じる起電力Ｖ
３１と、ｍ個の蓄電池１１に定電流交流成分の測定電流
を通電したときの被測定蓄電池１１の両極間に生じる起
電力Ｖ１１との変化量とから、定電圧電源４０及び負荷
５０を切り離した状態で被測定蓄電池１１に測定電流を
通電したときの発生起電力Ｖ０を算出する。
【００１４】しかる後、第４のステップとして、この発
生起電力Ｖ０に基づいて被測定蓄電池１１の内部インピ
ーダンスを測定するというものである。
【００１５】仮に、蓄電池１１〜１７を定電圧電源４０
及び負荷５０から切り離した状態で、上記のように、ｎ
個の蓄電池１１，１２，１３に定電流交流成分の測定電
流を通電したときと、ｍ個の蓄電池１１に定電流交流成
分の測定電流を通電したときとでは、被測定蓄電池１１
の両極間に生じる起電力Ｖ３１及びＶ１１は一致する。
このときの起電力をＶ０とする。
【００１６】これに対し、蓄電池１１〜１７を定電圧電
源４０及び負荷５０に接続した状態で、ｎ個の蓄電池１
１，１２，１３に定電流交流成分の測定電流を通電する
と、この測定電流が通電された各蓄電池１１，１２，１
３ではそれぞれ内部インピーダンス値ｒ１（蓄電池１１
の内部インピーダンス値），ｒ２（蓄電池１２の内部イ
ンピーダンス値），ｒ３（蓄電池１３の内部インピーダ
ンス値）に比例した起電力が発生する。これにより、直
列に接続された蓄電池１１〜１７の合計電圧が変動す
る。同様に、蓄電池１１〜１７を定電圧電源４０及び負
荷５０に接続した状態で、ｍ個の蓄電池１１に定電流交
流成分の測定電流を通電した場合も、この蓄電池１１で
は内部インピーダンス値ｒ１に比例した起電力が発生す
るので、その分、蓄電池１１〜１７の合計電圧が変動す
る。この場合において、蓄電池１１〜１７の合計電圧の
変動は、内部インピーダンス値が大きい分、ｎ個の蓄電
池１１，１２，１３に定電流交流成分の測定電流を通電
したときの方が、ｍ個の蓄電池１１に定電流交流成分の
測定電流を通電したときよりも大きい。
【００１７】このように、蓄電池１１〜１７の合計電圧
が変動すると、定電圧電源４０はこの合計電圧を一定に
保つように制御が働き、定電圧電源４０から蓄電池１１
〜１７に流れる電流が変動する。この変動は、蓄電池の
内部インピーダンスの和に比例する。つまり、ｎ個の蓄
電池１１，１２，１３に定電流交流成分の測定電流を通
電した場合には、そのｎ個の蓄電池１１，１２，１３の
内部インピーダンス値ｒ１，ｒ２，ｒ３の和に比例して
定電圧電源４０からの電流が変動し、ｍ個の蓄電池１１
に定電流交流成分の測定電流を通電した場合には、その
ｍ個の蓄電池１１の内部インピーダンス値ｒ１に比例し
て定電圧電源４０からの電流が変動する。これらの定電
圧電源４０からの電流の変動は、定電流交流発生源２０
からの測定電流の流れ込みを生じさせ、結果的に蓄電池
に流れる測定電流を減少させる方向に働く。
【００１８】すなわち、ｎ個の蓄電池１１，１２，１３
に定電流交流成分の測定電流を通電した場合には、その
ｎ個の蓄電池１１，１２，１３の内部インピーダンス値
ｒ１，ｒ２，ｒ３の和に比例して測定電流が減少し、そ
れに対応して被測定蓄電池１１に発生する起電力Ｖ３１
が小さくなる。一方、ｍ個の蓄電池１１に定電流交流成
分の測定電流を通電した場合には、そのｍ個の蓄電池１
１の内部インピーダンス値ｒ１に比例して測定電流が減
少し、それに対応して被測定蓄電池１１に発生する起電
力Ｖ１１が小さくなる。
【００１９】以上の関係を、縦軸Ｙを被測定蓄電池１１
の起電力とし、横軸Ｘを測定電流が流れる蓄電池の数と
してグラフ化すると、蓄電池１１〜１７を定電圧電源４
０及び負荷５０から切り離した状態においては、図２中
Ａに示すように、被測定蓄電池１１の起電力は、測定電
流が流れる蓄電池の数に拘らず一定の特性を有するグラ
フとなるが、蓄電池１１〜１７を定電圧電源４０及び負
荷５０に接続した状態においては、図２中Ｂに示すよう
に、被測定蓄電池１１の起電力は、測定電流が流れる蓄
電池の数の増加つまり内部インピーダンスの増加に対し
て反比例の特性をもって減少するグラフとなる。
【００２０】ここに、反比例の特性をもつグラフＢは、
その傾きをａとし、ゼロ切片をｂとしたとき、下記
（１）式で表される。
【００２１】Ｙ＝−ａＸ＋ｂ …（１）
ここで、傾きａは、下記（２）式で表される。
【００２２】
ａ＝（Ｖ１１−Ｖ３１）／（ｍ−ｎ） …（２）
今、（１）式において、ｍ個の蓄電池１１に定電流交流
成分の測定電流を通電したときの被測定蓄電池１１の起
電力Ｖ１１を求めるとすると、
Ｙ＝Ｖ１１＝（―ａ×ΣＶｍ／ΣＶｎ）＋ｂ …（３）
となる。ここで、ΣＶｎはｎ個の蓄電池１１〜１３に定
電流交流成分の測定電流を通電したときの各蓄電池１１
〜１３にそれぞれ生じた起電力Ｖ３１，Ｖ３２，Ｖ３３
の総和であり、ΣＶｍはｎ個の蓄電池１１〜１３に定電
流交流成分の測定電流を通電したときのｍ個の蓄電池１
１に生じた起電力Ｖ３１の和である。
【００２３】また、（１）式において、ｎ個の蓄電池１
１〜１３に定電流交流成分の測定電流を通電したときの
被測定蓄電池１１の起電力Ｖ３１を求めるとすると、
Ｙ＝Ｖ３１＝（―ａ×ΣＶｎ／ΣＶｎ）＋ｂ …（４）
となる。
【００２４】そこで、第１のステップで測定した起電力
Ｖ３１，Ｖ３２，Ｖ３３と、第２のステップで測定した
起電力Ｖ１１とを上記（３）式及び（４）式に代入する
ことによって、ゼロ切片ｂを求めることができる。この
ゼロ切片ｂが定電圧電源４０及び負荷５０を切り離した
状態で被測定蓄電池１１に測定電流を通電したときの発
生起電力Ｖ０となる。
【００２５】これにより、被測定蓄電池１１の内部イン
ピーダンスｒ１は、起電力Ｖ０を定電流交流発生源２０
からの出力電流値で除算することによって求めることが
できる。
【００２６】以上のように本実施の形態によれば、蓄電
池１１〜１７を定電圧電源４０や負荷５０から切り離さ
なくても、精度よく被測定蓄電池１１の内部インピーダ
ンスｒ１を測定することができる。
【００２７】なお、前記一実施の形態では、７個の直列
接続された蓄電池１１，１２，１３，１４，１５，１
６，１７のうち被測定蓄電池１１の内部インピーダンス
を測定する場合において、ｎ＝３，ｍ＝１として説明し
たが、ｎが２以上でありかつｍがｍ＜ｎの関係を有する
場合であれば、直列接続される蓄電池の数に拘らず本発
明の作用効果を奏するものである。
【００２８】
【発明の効果】以上詳述したように本発明によれば、被
測定蓄電池を負荷等から切り離さなくても精度よく被測
定蓄電池の内部インピーダンスを測定することができる
蓄電池の内部インピーダンス測定方法を提供できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the internal impedance of a storage battery. 2. Description of the Related Art It has long been known to measure the internal impedance of a storage battery to determine the life and remaining capacity of the storage battery. As shown in FIG. 3A or 3B, a conventional method for measuring the internal impedance of a storage battery includes a plurality (seven in the case of FIG. 3) of storage batteries 1 connected in series.
A constant current AC source 20 is connected between the anode and the cathode of the storage battery 11 in 1, 12, 13, 14, 15, 16, and 17.
, A measuring current (charging / discharging current) of a constant current AC component is supplied thereto, and an electromotive force generated between the two terminals of the storage battery 11 to be measured is measured by a voltmeter 30.
The method was to measure the internal impedance of the device. In this method, as shown in FIG. 3 (a), when no device such as a constant voltage power supply 40 or a load 50 is connected to the storage batteries 11 to 16, measurement from the constant current AC generation source 20 is performed. Since all the current flows through the storage battery 11 to be measured, the internal impedance of the storage battery 11 to be measured can be accurately measured. However, as shown in FIG. If the device is connected, a part of the measured current from the constant current AC source 20 flows into the device such as the constant voltage power supply 40 and the load 50, so that the internal impedance of the storage battery 11 to be measured is accurately measured. It could not be measured. For this reason, it is preferable to separate the storage battery 11 to be measured from the constant voltage power supply 40 and the load 50 and other devices to measure the internal impedance of the storage battery 11 from the viewpoint of accuracy. The storage battery is connected to devices such as the constant voltage power supply 40 and the load 50, and measuring the internal impedance by separately separating the storage battery from these devices takes into account the simplification of maintenance management and the effective use of the storage battery. Then it was not desirable. As described above, in the conventional method for measuring the internal impedance of a storage battery, when the storage battery 11 to be measured is measured without disconnecting it from devices such as the constant voltage power supply 40 and the load 50, There is a problem in that a measurement error occurs and the internal impedance cannot be measured accurately. [0006] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for measuring the internal impedance of a storage battery that can be performed. Means for Solving the Problems The invention according to claim 1 is:
With a load connected to a plurality of storage batteries connected in series,
In the method for measuring the internal impedance of the storage battery, n (n ≧ n) including the storage battery to be measured among the plurality of storage batteries
2) A measurement current of a constant current AC component is supplied to the storage batteries to measure an electromotive force generated between both poles of the storage battery to be measured, and m (m <m including the storage batteries to be measured among the n storage batteries)
n) A measurement current of a constant current AC component is applied to the number of storage batteries to measure an electromotive force generated between both poles of the storage battery to be measured, and a measurement is performed when the measurement current of the constant current AC component is applied to the n storage batteries. The measured storage battery is separated from the load from the amount of change between the electromotive force generated between the two electrodes of the storage battery and the electromotive force generated between the both electrodes of the measured storage battery when the measurement current of the constant current AC component is applied to the m storage batteries. In this state, the generated electromotive force when the measured current is supplied to the measured storage battery is calculated, and the internal impedance of the measured storage battery is measured based on the generated electromotive force. An embodiment of a method for measuring the internal impedance of a storage battery according to the present invention will be described below with reference to FIGS. 1 and 2. In this embodiment, as shown in FIG. 1, seven batteries 11, 12, 13, 1 connected in series are connected.
In this case, the internal impedance of the storage battery 11 to be measured is measured in a state where the constant voltage power supply 40 and the load 50 are connected in parallel to 4, 15, 16, and 17, respectively. First, in the present embodiment, as a first step, n (n ≧ 2) continuous storage batteries (in the figure, including the storage battery 11 to be measured) among the seven series-connected storage batteries 11 to 17 are illustrated. Between the two poles of the storage batteries 11, 12, and 13) via the changeover switch 60
0 is connected. Then, the measured current of the constant current AC component is supplied from the constant current AC source 20 to the n storage batteries 11, 12, 13.
And the electromotive force V31, V32, V33 generated between both electrodes of each of the storage batteries 11, 12, 13 is measured by voltmeters 31, 32, 33, respectively. Next, as a second step, the changeover switch 60 is switched to set the n storage batteries 11, 12,.
The constant current AC source 20 is connected between both poles of m (m <n) storage batteries (one of the storage batteries 11 to be measured in the figure) including the storage battery 11 in 13. Then, a measurement current of a constant current AC component is supplied from the constant current AC generation source 20 to the storage battery 11 to be measured, and an electromotive force V11 generated between both poles of the storage battery 11 is measured by the wattmeter 31. The order of the first step and the second step may be changed. In other words, the second
After that, the first step may be executed by switching the changeover switch 60. Next, as a third step, an electromotive force V generated between both poles of the storage battery 11 when a measurement current of a constant current AC component is applied to the n storage batteries 11, 12, 13 is measured.
The constant-voltage power supply 40 and the load 50 were separated from the reference voltage 31 and the amount of change in the electromotive force V11 generated between the poles of the measured storage battery 11 when the measurement current of the constant current AC component was supplied to the m storage batteries 11. In the state, the generated electromotive force V0 when the measured current is supplied to the storage battery 11 to be measured is calculated. Thereafter, as a fourth step, the internal impedance of the storage battery 11 to be measured is measured based on the generated electromotive force V0. It is assumed that the storage batteries 11 to 17 are connected to a constant voltage power supply 40.
And with the load 50 disconnected, as described above, n
When the measured current of the constant current AC component is applied to the storage batteries 11, 12, and 13, and when the measured current of the constant current AC component is applied to the m storage batteries 11, the storage battery 11 to be measured is changed.
The electromotive forces V31 and V11 generated between the two electrodes coincide with each other.
The electromotive force at this time is defined as V0. On the other hand, when the storage batteries 11 to 17 are connected to the constant voltage power supply 40 and the load 50, the n storage batteries 1 to 17 are connected.
When a measurement current of a constant current AC component is supplied to the storage batteries 1, 12, and 13, the storage batteries 11, 12, 1 to which the measurement current is supplied are supplied.
3, the internal impedance value r1 (the storage battery 11
, R2 (the internal impedance value of the storage battery 12), and r3 (the internal impedance value of the storage battery 13). Thereby, the total voltage of the storage batteries 11 to 17 connected in series varies. Similarly, when the storage batteries 11 to 17 are connected to the constant-voltage power supply 40 and the load 50 and a measurement current of a constant current AC component is applied to the m storage batteries 11, the storage batteries 11 are proportional to the internal impedance value r1. Since the generated electromotive force is generated, the total voltage of the storage batteries 11 to 17 fluctuates accordingly. In this case, the fluctuation of the total voltage of the storage batteries 11 to 17 is larger when the measurement current of the constant current AC component is applied to the n storage batteries 11, 12, and 13 because the internal impedance value is larger. It is larger than when the measured current of the constant current AC component is supplied to the storage battery 11. As described above, when the total voltage of the storage batteries 11 to 17 fluctuates, the constant voltage power supply 40 controls the constant voltage power supply 40 so as to keep the total voltage constant.
To 17 vary. This variation is proportional to the sum of the internal impedance of the storage battery. That is, when a measurement current of a constant current AC component is applied to the n storage batteries 11, 12, and 13, the internal impedance values r1, r2, and r3 of the n storage batteries 11, 12, and 13 are proportional to the sum. The current from the constant voltage power supply 40 fluctuates, and the m storage batteries 11
When a measurement current of a constant current AC component is applied to the m storage batteries 11, the current from the constant voltage power supply 40 fluctuates in proportion to the internal impedance value r1 of the m storage batteries 11. The fluctuation of the current from the constant voltage power supply 40 is
This causes the measurement current to flow into the storage battery, and consequently acts to reduce the measurement current flowing to the storage battery. That is, n storage batteries 11, 12, 13
When a measurement current of a constant current AC component is applied to the storage battery, the measurement current decreases in proportion to the sum of the internal impedance values r1, r2, and r3 of the n storage batteries 11, 12, and 13. Electromotive force V31 generated in storage battery 11 to be measured
Becomes smaller. On the other hand, when a measurement current of a constant current AC component is applied to the m storage batteries 11, the m storage batteries 1
The measured current decreases in proportion to the internal impedance value r1 of 1, and the electromotive force V11 generated in the storage battery 11 to be measured correspondingly decreases. In the above relationship, the vertical axis Y is plotted on the storage battery 11 to be measured.
When the horizontal axis X is graphed as the number of storage batteries through which the measured current flows, the storage batteries 11 to 17 are connected to the constant voltage power supply 4.
In the state separated from the load 0 and the load 50, as shown in FIG. 2A, the electromotive force of the storage battery 11 to be measured is a graph having a constant characteristic regardless of the number of storage batteries through which the measured current flows. In a state where the power supply 11 to 17 are connected to the constant voltage power supply 40 and the load 50, as shown in B in FIG. 2, the electromotive force of the storage battery 11 to be measured increases the number of storage batteries through which the measurement current flows, that is, increases the internal impedance. Is a graph that decreases in inverse proportion to Here, the graph B having the inversely proportional characteristic is as follows.
When the slope is a and the zero intercept is b, it is expressed by the following equation (1). Y = −aX + b (1) Here, the slope a is expressed by the following equation (2). A = (V11−V31) / (m−n) (2) Now, in the equation (1), the measured storage battery 11 when the measurement current of the constant current AC component is applied to the m storage batteries 11 If the electromotive force V11 is obtained, Y = V11 = (− a × ΔVm / ΔVn) + b (3) Here, ΔVn is the value of each storage battery 11 when a measurement current of a constant current AC component is applied to n storage batteries 11 to 13.
To V13, V32, V33,
ΔVm is the number of storage batteries 1 when a measurement current of a constant current AC component is applied to the n storage batteries 11 to 13
1 is the sum of the electromotive forces V31 generated. In the equation (1), n storage batteries 1
Assuming that the electromotive force V31 of the storage battery 11 to be measured when the measurement current of the constant current AC component is supplied to 1 to 13 is obtained, Y = V31 = (− a × ΔVn / ΔVn) + b (4) Therefore, by substituting the electromotive forces V31, V32, V33 measured in the first step and the electromotive force V11 measured in the second step into the above equations (3) and (4), zero An intercept b can be determined. This zero intercept b becomes the generated electromotive force V0 when the measured current is applied to the storage battery 11 under the condition that the constant voltage power supply 40 and the load 50 are disconnected. Thus, the internal impedance r1 of the storage battery 11 to be measured changes the electromotive force V0 from the constant current AC source 20
Can be obtained by dividing by the output current value from. As described above, according to the present embodiment, the internal impedance r1 of the storage battery 11 to be measured can be accurately measured without disconnecting the storage batteries 11 to 17 from the constant voltage power supply 40 and the load 50. In the above-described embodiment, seven storage batteries 11, 12, 13, 14, 15, 1 connected in series are connected.
In the case where the internal impedance of the storage battery 11 to be measured is measured among the samples 6 and 17, n = 3 and m = 1 have been described. However, if n is 2 or more and m has a relationship of m <n. The effects of the present invention can be obtained regardless of the number of storage batteries connected in series. As described above in detail, according to the present invention, the internal impedance of a storage battery can be accurately measured without disconnecting the storage battery from a load or the like. We can provide a method.
【図面の簡単な説明】
【図１】 本発明の一実施の形態における蓄電池内部イ
ンピーダンス測定方法を説明するための回路図。
【図２】 同実施の形態において蓄電池を定電圧電源及
び負荷から切り離した状態と接続した状態の被測定蓄電
池の起電力と測定電流が流れる蓄電池の数との関係を示
す図。
【図３】 従来の蓄電池内部インピーダンス測定方法を
説明するための回路図。
【符号の説明】
１１〜１７…蓄電池
２０…定電流交流発生源
３０〜３３…電圧計
４０…定電圧電源
５０…負荷
６０…切替スイッチBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram for explaining a method for measuring the internal impedance of a storage battery according to an embodiment of the present invention. FIG. 2 is a diagram showing the relationship between the electromotive force of the storage battery to be measured and the number of storage batteries through which a measurement current flows, in a state where the storage battery is disconnected from the constant voltage power supply and the load in the embodiment. FIG. 3 is a circuit diagram for explaining a conventional method for measuring the internal impedance of a storage battery. [Description of Signs] 11 to 17: storage battery 20: constant current AC generators 30 to 33: voltmeter 40: constant voltage power supply 50: load 60: changeover switch
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 清 栃木県今市市荊沢字上原597 古河電池株 式会社今市事業所内 (72)発明者 星 俊彦 神奈川県横浜市保土ヶ谷区星川２丁目４番 １号 古河電池株式会社内 (72)発明者 市原 功 北海道札幌市豊平区月寒中央通７丁目６番 20号 ＪＡ月寒中央ビル ドコモエンジニ アリング北海道株式会社内 Ｆターム(参考） 2G016 CA00 CB06 CC02 2G028 AA01 AA02 BB20 BE04 CG08 DH05 DH12 FK01 5H030 AA00 BB09 FF41 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kiyoshi Takahashi 597 Jingzawa Uehara, Imaichi City, Tochigi Prefecture Furukawa Battery Co., Ltd. In the formula company Imaichi office (72) Inventor Toshihiko Hoshi 2-4 Hoshikawa, Hodogaya-ku, Yokohama, Kanagawa Prefecture No. 1 Inside Furukawa Battery Co., Ltd. (72) Inventor Isao Ichihara 7-6, Tsukikan Chuo-dori, Toyohira-ku, Sapporo, Hokkaido No.20 JA Tsukikan Chuo Building docomo Engini Alling Hokkaido Co., Ltd. F-term (reference) 2G016 CA00 CB06 CC02 2G028 AA01 AA02 BB20 BE04 CG08 DH05 DH12 FK01 5H030 AA00 BB09 FF41
Claims (1)
続した状態で、該蓄電池の内部インピーダンスを測定す
る方法において、 前記複数の蓄電池のうち被測定蓄電池を含むｎ（ｎ≧
２）個の蓄電池に定電流交流成分の測定電流を通電して
前記被測定蓄電池の両極間に生じる起電力を測定すると
ともに、前記ｎ個の蓄電池の中の被測定蓄電池を含むｍ
（ｍ＜ｎ）個の蓄電池に前記定電流交流成分の測定電流
を通電して前記被測定蓄電池の両極間に生じる起電力を
測定し、 前記ｎ個の蓄電池に定電流交流成分の測定電流を通電し
たときの前記被測定蓄電池の両極間に生じる起電力と前
記ｍ個の蓄電池に前記定電流交流成分の測定電流を通電
したときの前記被測定蓄電池の両極間に生じる起電力と
の変化量とから、前記被測定蓄電池を前記負荷から切り
離した状態で該被測定蓄電池に前記測定電流を通電した
ときの発生起電力を算出し、 この発生起電力に基づいて前記被測定蓄電池の内部イン
ピーダンスを測定することを特徴とする蓄電池の内部イ
ンピーダンス測定方法。Claims: 1. A method for measuring the internal impedance of a plurality of storage batteries connected in series with a load connected to the storage batteries, wherein n (b) includes a storage battery to be measured among the plurality of storage batteries. n ≧
2) A measurement current of a constant current AC component is supplied to the storage batteries to measure an electromotive force generated between both poles of the storage battery to be measured, and m includes the storage battery to be measured among the n storage batteries.
The measurement current of the constant current AC component is supplied to the (m <n) storage batteries to measure an electromotive force generated between both electrodes of the storage battery to be measured, and the measurement current of the constant current AC component is supplied to the n storage batteries. The amount of change between the electromotive force generated between both electrodes of the measured storage battery when energized and the electromotive force generated between the electrodes of the measured storage battery when the measurement current of the constant current AC component is applied to the m storage batteries. From the above, calculate the generated electromotive force when the measured current is applied to the measured storage battery in a state where the measured storage battery is disconnected from the load, and calculate the internal impedance of the measured storage battery based on the generated electromotive force. A method for measuring the internal impedance of a storage battery, characterized by measuring.
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| JP2001311716A JP3904875B2 (en) | 2001-10-09 | 2001-10-09 | Method for measuring internal impedance of storage battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001311716A JP3904875B2 (en) | 2001-10-09 | 2001-10-09 | Method for measuring internal impedance of storage battery |
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| JP3904875B2 JP3904875B2 (en) | 2007-04-11 |
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Cited By (5)
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|---|---|---|---|---|
| JP2008011597A (en) * | 2006-06-27 | 2008-01-17 | Sony Corp | Protection circuit of secondary battery and battery pack |
| JP2009109375A (en) * | 2007-10-31 | 2009-05-21 | Hioki Ee Corp | Electronic load device and internal resistance measuring device of battery |
| JP5708658B2 (en) * | 2010-12-10 | 2015-04-30 | 日産自動車株式会社 | Stacked battery internal resistance measuring apparatus and internal resistance measuring method |
| CN109828216A (en) * | 2019-01-30 | 2019-05-31 | 同济大学 | Improve the device and method of fuel cell subregion electrochemical impedance spectroscopy accuracy of measurement |
| CN111157792A (en) * | 2020-01-07 | 2020-05-15 | 聚融医疗科技(杭州)有限公司 | High-reliability power supply impedance detection circuit system |
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2001
- 2001-10-09 JP JP2001311716A patent/JP3904875B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008011597A (en) * | 2006-06-27 | 2008-01-17 | Sony Corp | Protection circuit of secondary battery and battery pack |
| JP4626578B2 (en) * | 2006-06-27 | 2011-02-09 | ソニー株式会社 | Battery pack |
| JP2009109375A (en) * | 2007-10-31 | 2009-05-21 | Hioki Ee Corp | Electronic load device and internal resistance measuring device of battery |
| JP5708658B2 (en) * | 2010-12-10 | 2015-04-30 | 日産自動車株式会社 | Stacked battery internal resistance measuring apparatus and internal resistance measuring method |
| CN109828216A (en) * | 2019-01-30 | 2019-05-31 | 同济大学 | Improve the device and method of fuel cell subregion electrochemical impedance spectroscopy accuracy of measurement |
| CN109828216B (en) * | 2019-01-30 | 2021-02-02 | 同济大学 | Device and method for improving accuracy of fuel cell partition electrochemical impedance spectrum measurement |
| CN111157792A (en) * | 2020-01-07 | 2020-05-15 | 聚融医疗科技(杭州)有限公司 | High-reliability power supply impedance detection circuit system |
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| JP3904875B2 (en) | 2007-04-11 |
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